JP6912261B2 - Composite lance for blast furnace tuyere - Google Patents

Description

In the present invention, a solid reducing material such as pulverized coal and a gas reducing material such as LNG (Liquefied Natural Gas) are blown from the blast furnace tuyere to raise the combustion temperature to improve and reduce productivity. It relates to the lance used in the operation method of the blast furnace to reduce the raw material unit.

In recent years, global warming due to an increase in carbon dioxide emissions has become a problem, and _{controlling CO 2} emissions is also an important issue in the steel industry. In response to this, in recent blast furnace operations, the total amount of reducing agent blown from the tuyere and coke charged from the top of the furnace per 1 ton of pig iron, which is an abbreviation for Low RAR: Reduction Agent Ratio. ) Operations are being strongly promoted. The blast furnace mainly uses coke and pulverized coal as reducing agents, and in order to achieve a low reducing agent ratio and, by extension, control of carbon dioxide emissions, coke and the like are used to have a high hydrogen content such as waste plastic, LNG, and heavy oil. A measure of replacement with a reducing agent is effective. At that time, by simultaneously blowing the solid reducing agent, the gas reducing agent, and the flammable gas from the lance, the temperature rise of the solid reducing agent is promoted by the combustion field of the gas reducing material, and the combustion rate of the solid reducing agent is improved. However, it is said that the ratio of reducing agents can be reduced by suppressing the generation of unburned powder and coke powder and improving ventilation. In Patent Document 1 below, for example, the lance is a triple pipe type, the inside of the innermost pipe is the inner pipe lance, the middle lance between the innermost pipe and the second pipe from the inside, and the second pipe from the inside and the most. The outer pipe lance is used between the outer pipes, and one type of solid reducing material, gas reducing material, and flammable gas is blown from each of the inner pipe lance, the intermediate lance, and the outer pipe lance.

By the way, a lance guide pipe is provided in the blow pipe (blow pipe) that mainly blows hot air to the tuyere, and the lance is inserted into the blow pipe through the lance guide pipe. However, as described in Patent Document 1, when the lance is a heavy pipe type and gas is blown from the gap between the pipes, the pressure loss with respect to the gas flow velocity is large, and when trying to achieve both the gas amount and the flow velocity, The diameter of the lance may become extremely large and it may not be possible to insert it into the guide tube for the lance.
Therefore, even if the amount of gas to be flowed as a fluid and the gas to be flowed to convey a solid are compatible with the flow velocity, the blast furnace blade can reduce the basic unit of the reducing agent without extremely increasing the diameter of the lance. As the composite lance for the mouth, for example, the composite lance for the blast furnace tuyere shown in Patent Document 2 has been proposed.

The composite lance for a blast furnace tuyere shown in Patent Document 2 is formed by a tubular body having a circular cross section, and has a cross section of a circular cross-sectional flow path portion through which a solid (solid reducing material) flows and both ends of the first vertically split tubular body. The first incomplete circular cross-section flow path, which is formed by joining to a circular tube and through which fluid (LNG or oxygen) flows, and one end of the second vertically split tube are made into a circular tube. A second incomplete circular cross-sectional flow path portion formed by joining and joining the other end of the second vertically split pipe to the first vertically split pipe and allowing fluid (LNG or oxygen) to flow. The collecting flow path portion is composed of the circular cross-section flow path portion and the first and second incomplete circular cross-section flow path portions.

According to the blast furnace tuyere lance shown in Patent Document 2, the circular cross-section flow path portion and the first and second incomplete circular cross-section flow path portions are larger than the gap between pipes in the heavy pipe type lance. The pressure loss with respect to the flow velocity is small, and even if the gas amount and flow velocity of the gas flowing as a fluid or the gas carrying the fixation are compatible, the outer peripheral diameter of the collecting flow path does not increase extremely, so the diameter of the entire lance is increased. It does not increase extremely. Therefore, a desired amount of solid reducing agent (pulverized coal), gas reducing agent (LNG), and flammable gas (oxygen) can be blown into the tuyere, and as a result, the reducing agent basic unit can be reduced. Can be done.

Japanese Unexamined Patent Publication No. 2011-174171 Japanese Unexamined Patent Publication No. 2015-129338

By the way, the lance inserted in the blow pipe that mainly blows hot air to the tuyere is exposed to hot air of 1000 ° C or higher, and the solid reducing agent, gas reducing agent, and flammable gas are simultaneously supplied from the lance. The composite lance to be blown is close to the combustion field of the reducing agent. For this reason, its cooling is very important. The cooling capacity of the lance depends on the flow velocity of each of the transport gas of the solid reducing agent, the gas reducing agent and the flammable gas, and the cooling fluid.
Here, in the composite lance for the blast furnace tuyere shown in Patent Document 2, a pipe body having a circular cross section (in the blower pipe) forming a circular cross-section flow path portion through which a solid (solid reducing material) flows, which constitutes the collecting flow path portion. The first and second vertically split pipes (inside the blower pipe) that make up the first and second incomplete circular cross-section flow paths through which the inserted lance) and fluid (LNG and oxygen) flow. Both of the inserted lances) are directly exposed to hot air.

A fluid (LNG or oxygen) flows through the incomplete circular cross-section flow path, and its blowing flow velocity is relatively high. Therefore, even if the vertically split pipe body is directly exposed to hot air, the fluid (LNG or oxygen) can be used appropriately. Can be cooled.
On the other hand, a solid (solid reducing material) flows through the circular cross-section flow path, and the flow velocity of the transport gas for transporting the solid is relatively slow. The cooling capacity is insufficient.
Therefore, the present invention has been made to solve this conventional problem, and an object thereof is a composite for a blast furnace tuyere that enables a reduction in the raw material unit of a reducing agent without extremely increasing the diameter of the lance. An object of the present invention is to provide a composite lance for a blast furnace tuyere capable of appropriately cooling a tubular body having a circular cross section forming a circular cross-section flow path portion through which a solid flows.

In order to solve the above problems, the composite lance for a blast furnace tuyere according to one aspect of the present invention is formed by a tubular body having a circular cross section, and has a circular cross-sectional flow path portion through which a solid flows and a cross section of the tubular body in the longitudinal direction. An incomplete circular cross-sectional flow path portion formed by joining both ends of a vertically divided tubular body having a continuous notch and an arc shape to the circular tubular body, and a circular cross-sectional flow path portion through which fluid flows. And a fluid formed by an outer peripheral tube having a circular cross section provided on the outer periphery of the incomplete circular cross section channel portion so as to cover the circular cross section flow path portion and the longitudinal end portion of the incomplete circular cross section flow path portion. It is characterized in that it is provided with a gap flow path portion through which the flow is flowing, and a collecting flow path portion is formed by the circular cross-section flow path portion, the incomplete circular cross-section flow path portion, and the gap flow path portion.

Further, the composite lance for a blast furnace tuyere according to another aspect of the present invention is formed by a tubular body having a circular cross section, and has a circular cross-sectional flow path portion through which a solid flows and a tubular body having a non-circular cross section. A non-circular cross-sectional flow path portion formed by joining to and through which a fluid flows, and a circular cross-section flow path portion and the non-circular cross-section flow path portion on the outer periphery of the circular cross-section flow path portion and the non-circular cross-section flow path portion. It is formed by an outer peripheral tube having a circular cross section provided so as to cover up to the end in the longitudinal direction, and includes a gap flow path portion through which fluid flows, and the circular cross section flow path portion, the non-circular cross section flow path portion, and the crevice flow section. It is characterized in that a collecting flow path portion is formed by a road portion.

According to the composite lance for a blast furnace tuyere of the present invention, the circular cross-sectional flow path portion formed by a tubular body having a circular cross section and through which a solid flows, and the cross section of the tubular body are continuously cut out in the longitudinal direction to form an arc shape. An incomplete circular cross-sectional flow path portion formed by joining both ends of the vertically split tube body to the circular cross-section tube body and through which a fluid flows, and the circular cross-sectional flow path portion and the incomplete circular cross-section flow path portion. It is provided with a gap flow path portion formed by an outer peripheral tube body having a circular cross section provided on the outer periphery so as to cover the circular cross-sectional flow path portion and the longitudinal end portion of the incomplete circular cross-section flow path portion, and through which a fluid flows. The collecting flow path portion was formed by the circular cross-sectional flow path portion, the incomplete circular cross-section flow path portion, and the gap flow path portion. The circular cross-sectional flow path, the incomplete circular cross-section flow path, and the gap flow path have a smaller pressure loss with respect to the flow velocity than the gap between pipes in the heavy pipe type lance, and are used to convey gas or solid to be flowed as a fluid. Even if the amount of gas to be flown and the flow velocity are compatible, the outer peripheral diameter of the collecting flow path portion does not increase extremely, so that the diameter of the entire lance does not increase extremely. Therefore, it is possible to blow a desired amount of solid reducing agent, gas reducing agent, and flammable gas into the tuyere without extremely increasing the diameter of the lance, and as a result, the reducing agent basic unit can be reduced. Can be done.

Then, in this composite lance for the blast furnace tuyere, the longitudinal end of the circular cross-section flow path portion and the incomplete circular cross-section flow path portion on the outer periphery of the circular cross-section flow path portion through which the solid flows and the incomplete circular cross-section flow path portion through which the fluid flows. It is formed by an outer peripheral tube with a circular cross section provided so as to cover the portion, and is provided with a gap flow path portion through which fluid flows, and is assembled by a circular cross section flow path portion, an incomplete circular cross section flow path portion, and a gap flow path portion. I composed a part. Therefore, the circular tubular body forming the circular cross-section flow path portion through which the solid flows and the vertically split tubular body forming the incomplete circular cross-section flow path portion are formed by the outer peripheral tubular body forming the gap flow path portion through which the fluid flows. It is covered up to its longitudinal end. Therefore, the tubular body having a circular cross section is not directly exposed to hot air, but is cooled by the fluid flowing through the gap flow path portion and the fluid flowing through the incomplete circular cross section flow path portion. Thereby, it is possible to provide a composite lance for a blast furnace tuyere capable of appropriately cooling a pipe body having a circular cross section forming a circular cross-section flow path portion through which a solid flows.
The outer peripheral pipe body forming the gap flow path portion is directly exposed to hot air, but since the fluid flows through the gap flow path portion and the blowing flow velocity is relatively high, the outer peripheral pipe body is directly exposed. Even when exposed to hot air, it can be properly cooled by the fluid.

It is a vertical cross-sectional view of the blast furnace to which the composite lance for the blast furnace tuyere according to the 1st Embodiment of this invention is applied. It is a figure for demonstrating the appearance of the lance for a blast furnace tuyere shown in FIG. It is a figure for demonstrating the arrangement of the lance for the blast furnace tuyere shown in FIG. It is sectional drawing which follows the 4-4 line of FIG. It is sectional drawing which follows the 5-5 line of FIG. It is sectional drawing which cut the lance for a blast furnace tuyere which concerns on 2nd Embodiment of this invention in the direction perpendicular to the axis. It is sectional drawing which cut the lance for a blast furnace tuyere which concerns on 3rd Embodiment of this invention in the direction perpendicular to the axis. It is sectional drawing which cut the lance for a blast furnace tuyere which concerns on 4th Embodiment of this invention in the direction perpendicular to the axis. It is sectional drawing which cut the lance for a blast furnace tuyere which concerns on 5th Embodiment of this invention in the direction perpendicular to the axis. It is sectional drawing which cut the lance for a blast furnace tuyere which concerns on 6th Embodiment of this invention in the direction perpendicular to the axis.

Next, an embodiment of the composite lance for the blast furnace tuyere according to the present invention will be described with reference to the drawings.
(First Embodiment)
FIG. 1 shows a blast furnace 1 to which a composite lance for a blast furnace tuyere (hereinafter, simply referred to as a lance) 4 according to the first embodiment of the present invention is applied.
As shown in FIG. 1, a blower pipe (blow pipe) 2 for blowing hot air is connected to the tuyere 3 of the blast furnace 1, and a lance 4 is installed through the blower pipe 2. A combustion space called a raceway 5 exists in the coke deposit layer ahead of the tuyere 3 in the hot air blowing direction, and iron ore is mainly reduced, that is, iron making is performed in this combustion space. A lance guide pipe (not shown) is inserted into the wall of the blower pipe 2, and the lance 4 is inserted inside the lance guide pipe.

The lance 4 separately blows each of the solid reducing material (pulverized coal), the gas reducing material (LNG), and the flammable gas (oxygen) into the blower pipe 2, and is shown in FIGS. 2, 4, and 5. As shown, the circular cross-sectional flow path portion 11 extending in the front-rear direction in which the solid-reducing material as a solid flows (the right side is the front and the left side is the rear in FIG. 2) and the front-rear direction in which the gas-reducing material as a fluid flows. An incomplete circular cross-sectional flow path portion 13 extending in the circular cross-section flow path portion 13 and a gap flow path portion 15 extending in the front-rear direction in which a flammable gas as a fluid flows, the circular cross-section flow path portion 11, the incomplete circular cross-section flow path portion 13, and the incomplete circular cross-section flow path portion 13. The gap flow path portion 15 constitutes the collective flow path portion 10.

Here, as shown in FIGS. 4 and 5, the circular cross-section flow path portion 11 is formed by a tubular body 12 having a circular cross section extending in the front-rear direction (longitudinal direction).
Further, as shown in FIGS. 4 and 5, the incomplete circular cross-section flow path portion 13 is a vertically divided pipe body 14 in which the cross section of the pipe body is continuously cut out in the front-rear direction (longitudinal direction) to form an arc shape. Both ends of the above are joined to the outer peripheral surface of the tubular body 12 having a circular cross section, and are formed between the vertically split tubular body 14 and the tubular body 12 having a circular cross section.

Further, as shown in FIGS. 4 and 5, the gap flow path portion 15 has a circular cross-section flow path portion 11 and an incomplete circular cross-section flow path on the outer periphery of the circular cross-section flow path portion 11 and the incomplete circular cross-section flow path portion 13. An outer peripheral tube 16 having a circular cross section extending in the front-rear direction (longitudinal direction) provided so as to cover the front end portion (longitudinal end portion) of the portion 13, a tubular body 12 having a circular cross section, a vertically split tubular body 14, and an outer peripheral tube. It is formed between the body 16 and the body 16.
Front ends of a tubular body 12 having a circular cross-section forming a circular cross-section flow path portion 11, a vertically split pipe body 14 forming an incomplete circular cross-section flow path portion 13, and an outer peripheral tubular body 16 forming a gap flow path portion 15. Are flush with each other, as shown in FIG.

Specifically, the collecting flow path portion 10 will be described. As shown in FIG. 4, one circular cross-section flow path portion 11 is formed by one circular cross-section tube body 12, and the outer peripheral surface of the tube body 12 is formed. On the left side of the drawing, both ends in the circumferential direction of one vertically split pipe 14 having an arc shape having a cross section of about 3/4 arc are joined to form an incomplete circular cross-section flow path portion 13. Further, the pipe body 12 forming the circular cross-section flow path portion 11 and the front end portion of the vertically split pipe body 14 forming the incomplete circular cross-section flow path portion 13 are covered with the outer peripheral tube body 16 having a circular cross section, and the tube body 12 and the vertical section are vertically formed. A gap flow path portion 15 is formed between the split pipe body 14 and the outer peripheral pipe body 16. Then, the collecting flow path portion 10 is formed by the circular cross-section flow path portion 11, the incomplete circular cross-section flow path portion 13, and the gap flow path portion 15. In the present embodiment, the pipe body 12 forming the circular cross-section flow path portion 11, the vertically split pipe body 14 forming the incomplete circular cross-section flow path portion 13, and the outer peripheral pipe body 16 forming the gap flow path portion 15 are made of stainless steel. Made of steel pipe. Further, welding is used for joining the vertically split pipe body 14 to the pipe body 12.

Then, as shown in FIG. 2, a solid reducing material supply means 41 for supplying the solid reducing material is connected to the rear end portion of the circular cross-sectional flow path portion 11.
Further, the rear end portion of the incomplete circular cross-sectional flow path portion 13 is closed by a wall member (not shown), and the gas supply port 13a is connected to the wall member as shown in FIG. A gas reducing material supply means 42 for supplying the gas reducing material is connected to 13a.
Further, the rear end portion of the gap flow path portion 15 is closed by a wall member (not shown), and as shown in FIG. 2, a gas supply port 15a is connected to the wall member, and the gas supply port 15a is connected to the gas supply port 15a. , The flammable gas supply means 43 for supplying the flammable gas is connected.

Further, as shown in FIGS. 4 and 5, a second outer peripheral pipe body 32 having a circular cross section is provided on the outer periphery of the outer peripheral pipe body 16 constituting the collecting flow path portion 10, and the outer peripheral pipe body 16 and the second outer peripheral pipe are provided. The gap between the body 32 and the body 32 is used as a supply-side cooling fluid flow path portion 31 for cooling the collecting flow path portion 10. Further, as shown in FIGS. 4 and 5, a third outer peripheral tube 34 having a circular cross section is provided on the outer periphery of the second outer peripheral tube 32, and the second outer peripheral tube 32 and the third outer peripheral tube 34 are connected to each other. The gap is provided as a return-side cooling fluid flow path portion 33 for the cooling fluid. Here, as shown in FIG. 5, the front end portion of the second outer peripheral pipe body 32 is arranged so as to be located behind the front end portion of the third outer peripheral pipe body 34, and the front end portion of the third outer peripheral pipe body 34. A gap is formed between the surface and the front end portion of the second outer peripheral tube body 32. Then, the gap between the front end portion of the third outer peripheral pipe body 34 and the outer peripheral pipe body 16 constituting the collecting flow path portion 10 is closed by the lid body 34a. As a result, the cooling fluid is folded back from the front end of the supply-side cooling fluid flow path portion 31 that covers the outside of the outer peripheral pipe body 16 in front of the lid 34a, flows into the return-side cooling fluid flow path portion 33, and returns to the rear side. A circulation system is formed. As shown in FIG. 5, the collecting flow path portion 10 projects forward with respect to the lid body 34a arranged at the front end portion of the third outer peripheral pipe body 34.

A cooling fluid supply means 44 for supplying the cooling fluid is connected to the cooling fluid supply port 31a provided at the rear end of the supply side cooling fluid flow path portion 31. Further, a cooling fluid discharge means 45 for discharging the cooling fluid is connected to the cooling fluid discharge port 33a provided at the rear end of the return side cooling fluid flow path portion 33. The cooling fluid discharge means 45 is connected to the cooling fluid supply means 44 to form the above-mentioned cooling circulation system. Water is optimal as the cooling fluid, but gases such as nitrogen gas and air can also be used.

Then, as shown in FIG. 3, the lance 4 is inserted into the blower pipe 2 so that the insertion length from the front end portion of the collecting flow path portion 10 is l (approximately 200 mm). When the lance 4 is inserted into the blower pipe 2, the supply side cooling fluid flow path portion 31 and the return side cooling fluid flow path portion 33 on the front end side of the collecting flow path portion 10 and the outer periphery of the collecting flow path portion 10 thereof. The front end side of the air is projected into the air duct 2.
Then, the solid reducing material (fine pulverized coal) is blown into the blower pipe 2 by the transport gas from the circular cross-section flow path portion 11 constituting the collecting flow path portion 10 of the lance 4, and at the same time, from the incomplete circular cross-section flow path portion 13. The gas reducing material (LNG) is blown into the blower pipe 2, and the flammable gas (oxygen) is blown into the blower pipe 2 from the gap flow path portion 15.

Here, the circular cross-sectional flow path portion 11, the incomplete circular cross-section flow path portion 13, and the gap flow path portion 15 have a smaller pressure loss with respect to the flow velocity than the gap between pipes in the heavy pipe type lance, and the gas flowing as a fluid or the like. Even if the amount of gas flowing to convey the solid and the flow velocity are compatible, the outer peripheral diameter of the collecting flow path portion 10 does not increase extremely, so that the diameter of the entire lance 4 does not increase extremely. .. Therefore, it is possible to blow a desired amount of the solid reducing agent, the gas reducing agent, and the flammable gas into the tuyere 3 without increasing the diameter of the lance 4 extremely, and as a result, the reducing material basic unit is reduced. can do.

Then, the collecting flow path portion 10 of the lance 4 is cooled at the same time as the solid reducing agent, the gas reducing agent, and the flammable gas are blown into the blower pipe 2. In the cooling of the collecting flow path portion 10, the cooling fluid flows from the cooling fluid supply means 44 in the supply side cooling fluid flow path portion 31, and returns from the front end of the supply side cooling fluid flow path portion 31 in front of the lid 34a. It is carried out by flowing into the side cooling fluid flow path portion 33, returning to the rear side, and circulating this.
Here, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid body 34a arranged at the front end portion of the third outer peripheral pipe body 34 is not sufficiently cooled by the cooling fluid. On the other hand, as shown in FIG. 3, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid body 34a is located in the blower pipe 2 and is directly exposed to hot air. That is, the outer peripheral pipe body 16 forming the gap flow path portion 15 is directly exposed to the hot air.

However, a flammable gas (oxygen) as a fluid flows through the gap flow path portion 15, and the blowing flow velocity thereof is relatively high. Therefore, even if the outer peripheral tube 16 is directly exposed to hot air, the flammable gas is appropriate. Can be cooled to.
Further, in the conventional composite lance for a blast furnace tuyere shown in Patent Document 2, a tubular body having a circular cross section forming a circular cross-section flow path portion through which a solid (solid reducing agent) flows, which constitutes an assembly flow path portion, is blown. Directly exposed to hot air in the tube. On the other hand, since the flow velocity of the transport gas through which the solid flows is relatively slow, cooling of the tubular body having a circular cross section by the transport gas cannot be expected so much.

On the other hand, in the lance 4 according to the first embodiment, on the outer periphery of the circular cross-section flow path portion 11 through which the solid reducing material as a solid flows and the incomplete circular cross-section flow path portion 13 through which the gas reducing material as a fluid flows. A gap flow path portion 15 formed by an outer peripheral tube body 16 having a circular cross section provided so as to cover up to the front end portion of the circular cross-section flow path portion 11 and the incomplete circular cross-section flow path portion 13, and through which a flammable gas as a fluid flows. It has. Therefore, the vertically divided pipe body 12 forming the circular cross-section flow path portion 11 through which the solid flows and the vertically divided pipe body 14 forming the incomplete circular cross-section flow path portion 13 form the gap flow path portion 15 through which the fluid flows. The outer peripheral tube body 16 covers the front end portion thereof. Therefore, the tubular body 12 having a circular cross section is not directly exposed to hot air, but is cooled by the fluid flowing through the gap flow path portion 15 and the fluid flowing through the incomplete circular cross section flow path portion 13. Thereby, it is possible to provide a composite lance 4 for a blast furnace tuyere capable of appropriately cooling a pipe body 12 having a circular cross section forming a circular cross-section flow path portion 11 through which a solid flows.

Further, the vertically split pipe body 14 forming the incomplete circular cross-section flow path portion 13 is a gas reducing material as a fluid flowing through the incomplete circular cross-section flow path portion 13 and a combustion support as a fluid forming the gap flow path portion 15. It is cooled by a sex gas.
Further, a second outer peripheral pipe body 32 having a circular cross section is provided on the outer periphery of the outer peripheral pipe body 16 constituting the collecting flow path portion 10, and the collecting flow path portion 10 is formed in the gap between the outer peripheral pipe body 16 and the second outer peripheral pipe body 32. It is provided as a supply-side cooling fluid flow path portion 31 for a cooling fluid for cooling. In the conventional composite lance for blast furnace tuyere shown in Patent Document 2, the gap between the collecting flow path portion and the outer peripheral pipe body provided as the supply side cooling fluid flow path portion for the cooling fluid is not uniform in the circumferential direction. Cooling of the collecting flow path is not efficient due to the non-uniformity. On the other hand, in the case of the lance 4 according to the present embodiment, the gap between the outer peripheral tube 16 having a circular cross section and the second outer peripheral tube 32 having a circular cross section becomes uniform in the circumferential direction, and the collecting flow path portion 10 is efficiently used. Can be cooled.

Further, the circular cross-section flow path portion 11 is used as a flow path through which the solid flows, and the solid reducing material supply means 41 for supplying the solid reducing material is connected to the circular cross-section flow path portion 11 through which the solid flows. Since the circular cross-section flow path portion has a smaller flow resistance than the incomplete circular cross-section flow path portion, the circular cross-section flow path portion is used as a flow path through which a solid flows, and the solid reducing material supply means 41 is connected to the flow path to form a solid. If the reducing material is blown, the solid reducing material can be smoothly blown into the blower pipe 2 and the tuyere 3.

(Second Embodiment)
Next, the composite lance for the blast furnace tuyere according to the second embodiment of the present invention will be described with reference to FIG.
FIG. 6 shows a lance for a blast furnace tuyere (hereinafter, simply referred to as a lance) 4 according to a second embodiment of the present invention.
The lance 4 shown in FIG. 6 has the same basic configuration as the lance 4 according to the first embodiment shown in FIG. 4, but the configuration of the collecting flow path portion 10 is different.
That is, the lance 4 shown in FIG. 6 is provided so as to cover the incomplete circular cross-sectional flow path portion 13 in the gap flow path portion 15, and the cross section of the tubular body is continuously cut out in the front-rear direction (longitudinal direction). Both ends of the second vertically divided pipe body 18 having an arcuate cross section are joined to the pipe body 12 having a circular cross section, and the fluid flows between the vertically divided pipe body 14 and the second vertically divided pipe body 18. A completely circular cross-sectional flow path portion 17 is formed. The collecting flow path portion 10 is composed of the circular cross-section flow path portion 11, the incomplete circular cross-section flow path portion 13, the second incomplete circular cross-section flow path portion 17, and the gap flow path portion 15. The fluid flowing through the second incomplete circular cross-section flow path portion 17 may be a gas reducing agent, a flammable gas or other fluid, for example, shale gas or C gas.

Here, a tubular body 12 having a circular cross section forming a circular cross-section flow path portion 11, a vertically split pipe body 14 forming an incomplete circular cross-section flow path portion 13, and a second incomplete circular cross-section flow path portion 17 are formed. The front ends of the two vertically split pipe bodies 18 and the outer peripheral pipe bodies 16 forming the gap flow path portion 15 are flush with each other, although not shown.
Specifically, the collecting flow path portion 10 will be described. As shown in FIG. 6, one circular cross-section flow path portion 11 is formed by one circular cross-section tube body 12, and the outer peripheral surface of the tube body 12 is formed. On the left side of the drawing, both ends in the circumferential direction of one vertically split pipe 14 having an arc shape having a cross section of about 3/4 arc are joined to form an incomplete circular cross-section flow path portion 13. Further, one second vertically divided pipe 18 having a cross section of about 4/5 arc shape is arranged on the left side of the outer peripheral surface of the pipe 12 so as to cover the vertically divided pipe 14, and the second vertically divided pipe is arranged. Both ends of the body 18 in the circumferential direction are joined to the outer peripheral surface of the tubular body 12 to form a second incomplete circular cross-sectional flow path portion 17. Further, the pipe body 12 forming the circular cross-section flow path portion 11, the vertically split pipe body 14 forming the incomplete circular cross-section flow path portion 13, and the second vertically split pipe forming the second incomplete circular cross-section flow path portion 17. The front end of the body 18 is covered with an outer peripheral tube body 16 having a circular cross section, and a gap flow path portion 15 is formed between the tube body 12 and the second vertically split tube body 18 and the outer peripheral tube body 16. Then, the collecting flow path portion 10 is formed by these circular cross-section flow path portions 11, the incomplete circular cross-section flow path portion 13, the second incomplete circular cross-section flow path portion 17, and the gap flow path portion 15. In the present embodiment, the pipe body 12 that forms the circular cross-section flow path portion 11, the vertically split pipe body 14 that forms the incomplete circular cross-section flow path portion 13, and the second incomplete circular cross-section flow path portion 17 are formed. The outer peripheral pipe body 16 forming the vertically split pipe body 18 and the gap flow path portion 15 is made of a stainless steel pipe. Further, welding is used for joining the vertically divided pipe body 14 and the second vertically divided pipe body 18 to the pipe body 12.

Then, the lance 4 is inserted into the blower pipe 2 so that the insertion length from the front end portion of the collecting flow path portion 10 is l (approximately 200 mm), similarly to the lance 4 shown in FIG. When the lance 4 is inserted into the blower pipe 2, the supply side cooling fluid flow path portion 31 and the return side cooling fluid flow path portion 33 on the front end side of the collecting flow path portion 10 and the outer periphery of the collecting flow path portion 10 thereof. The front end side of the air is projected into the air duct 2.
A solid reducing agent supply means 41 (see FIG. 2) for supplying the solid reducing agent is connected to the rear end of the circular cross-sectional flow path portion 11, similarly to the lance 4 according to the first embodiment.

Further, the rear end portion of the incomplete circular cross-sectional flow path portion 13 is closed by a wall member (not shown), but the gas supply port 13a (FIG. 2) is connected, and the gas reducing agent supply means 42 (see FIG. 2) for supplying the gas reducing agent is connected to the gas supply port 13a.
Further, the rear end portion of the gap flow path portion 15 is closed by a wall member (not shown), but the wall member has a gas supply port 15a (see FIG. 2) as in the case of the lance 4 according to the first embodiment. Is connected, and a flammable gas supply means 43 (see FIG. 2) for supplying flammable gas is connected to the gas supply port 15a.

Further, the rear end portion of the second incomplete circular cross-sectional flow path portion 17 is closed by a wall member (not shown), and a gas supply port (not shown) is connected to the wall member, and the gas supply port is connected to the gas supply port (not shown). , The means for supplying the above-mentioned fluid flowing to the second incomplete circular cross-section flow path portion 17 is connected.
Then, the solid reducing material (fine pulverized coal) is blown into the blower pipe 2 by the transport gas from the circular cross-sectional flow path portion 11 constituting the collecting flow path portion 10 of the lance 4, and at the same time, from the incomplete circular cross-section flow path portion 13. The gas reducing material (LNG) is blown into the blower pipe 2, the above-mentioned fluid is blown from the second incomplete circular cross-sectional flow path portion 17, and the flammable gas (oxygen) is blown from the gap flow path portion 15. It is blown into 2.

Then, the collecting flow path portion 10 of the lance 4 is cooled at the same time as the solid reducing agent, the gas reducing agent, and the flammable gas are blown into the blower pipe 2. In the cooling of the collecting flow path portion 10, the cooling fluid flows from the cooling fluid supply means 44 in the supply side cooling fluid flow path portion 31, and returns from the front end of the supply side cooling fluid flow path portion 31 in front of the lid 34a. It is carried out by flowing into the side cooling fluid flow path portion 33, returning to the rear side, and circulating this.
However, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid body 34a arranged at the front end portion of the third outer peripheral pipe body 34 is a cooling fluid similar to the lance 4 shown in FIG. Cooling by is not carried out sufficiently. On the other hand, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid body 34a is located in the blower pipe 2 and is directly exposed to hot air. That is, the outer peripheral pipe body 16 forming the gap flow path portion 15 is directly exposed to the hot air.
However, as in the case of the lance 4 shown in FIG. 3, a flammable gas (oxygen) as a fluid flows through the gap flow path portion 15, and the blowing flow velocity thereof is relatively high, so that the outer peripheral tube 16 directly becomes hot air. Even if exposed, it can be appropriately cooled by a flammable gas.

Further, in the lance 4 according to the second embodiment, a circular cross-sectional flow flows around the outer periphery of the circular cross-section flow path portion 11 through which the solid reducing material as a solid flows and the incomplete circular cross-section flow path portion 13 through which the gas reducing material as a fluid flows. It is provided with a gap flow path portion 15 formed by an outer peripheral tube body 16 having a circular cross section provided so as to cover the road portion 11 and the front end portion of the incomplete circular cross-section flow path portion 13. The lance 4 is provided in the gap flow path portion 15 so as to cover the incomplete circular cross-section flow path portion 13, and the cross section of the tubular body is continuously cut out in the longitudinal direction to form a second arc-shaped cross section. Both ends of the vertically split pipe body 18 are joined to the pipe body 12 having a circular cross section to form a second incomplete circular cross-section flow path portion 17 through which the fluid flows. Therefore, the circular pipe body 12 forming the circular cross-section flow path portion 11 through which the solid flows, the vertically split pipe body 14 forming the incomplete circular cross-section flow path portion 13, and the second incomplete circular cross-section flow path portion 17 are provided. The second vertically split pipe body 18 to be formed is covered up to the front end portion thereof by the outer peripheral pipe body 16 forming the gap flow path portion 15 through which the fluid flows. Therefore, the tubular body 12 having a circular cross section is not directly exposed to hot air, and has a fluid flowing through the gap flow path portion 15, a fluid flowing through the incomplete circular cross section flow path portion 13, and a second incomplete circular cross section flow path portion 17. It is cooled by the flowing fluid. Thereby, it is possible to provide a composite lance 4 for a blast furnace tuyere capable of appropriately cooling a pipe body 12 having a circular cross section forming a circular cross-section flow path portion 11 through which a solid flows.

(Third Embodiment)
Next, the composite lance for the blast furnace tuyere according to the second embodiment of the present invention will be described with reference to FIG. 7.
FIG. 7 shows a lance for a blast furnace tuyere (hereinafter, simply referred to as a lance) 4 according to a third embodiment of the present invention.
The lance 4 shown in FIG. 7 has the same basic configuration as the lance 4 according to the first embodiment shown in FIG. 4, but the configuration of the collecting flow path portion 10 is different.
That is, in the lance 4 shown in FIG. 7, the fluid is supplied by the second tubular body 20 having a circular cross section provided in the gap flow path portion 15 so as to cover the circular cross-section flow path portion 11 and the incomplete circular cross-section flow path portion 13. The flowing second gap flow path portion 19 is formed, and the collecting flow path portion 10 is formed by the circular cross-section flow path portion 11, the incomplete circular cross-section flow path portion 13, the second gap flow path portion 19, and the gap flow path portion 15. ing. The fluid flowing through the second gap flow path portion 19 may be a gas reducing agent, a flammable gas or other fluid, for example, shale gas or C gas.

Here, the tubular body 12 having a circular cross section forming the circular cross-section flow path portion 11, the vertically split tubular body 14 forming the incomplete circular cross-section flow path portion 13, and the second tubular body forming the second gap flow path portion 19. The front ends of the outer peripheral tubular body 16 forming the gap passage portion 15 and the gap 20 are flush with each other, although not shown.
Specifically, the collecting flow path portion 10 will be described. As shown in FIG. 7, one circular cross-section flow path portion 11 is formed by one circular cross-section tube body 12, and the outer peripheral surface of the tube body 12 is formed. On the left side of the drawing, both ends in the circumferential direction of one vertically split pipe 14 having an arc shape having a cross section of about 3/4 arc are joined to form an incomplete circular cross-section flow path portion 13. Further, one second pipe body 20 having a circular cross section is arranged so as to cover the pipe body 12 and the front end portion of the vertically split pipe body 14, and the pipe body 12, the vertically split pipe body 14, and the second pipe body 20 are arranged. A second gap flow path portion 19 is formed between the two. Further, the front end portion of the tubular body 12 forming the circular cross-section flow path portion 11, the vertically split tubular body 14 forming the incomplete circular cross-section flow path portion 13, and the second tubular body 20 forming the second gap flow path portion 19. It is covered with an outer peripheral tube body 16 having a circular cross section, and a gap flow path portion 15 is formed between the second tube body 20 and the outer peripheral tube body 16. Then, the collecting flow path portion 10 is formed by these circular cross-section flow path portions 11, the incomplete circular cross-section flow path portion 13, the second gap flow path portion 19, and the gap flow path portion 15. In the present embodiment, the pipe body 12 that forms the circular cross-section flow path portion 11, the vertically split pipe body 14 that forms the incomplete circular cross-section flow path portion 13, and the second pipe body 20 that forms the second gap flow path portion 19. The outer peripheral pipe body 16 forming the gap flow path portion 15 is made of a stainless steel pipe.

Then, the lance 4 is inserted into the blower pipe 2 so that the insertion length from the front end portion of the collecting flow path portion 10 is l (approximately 200 mm), similarly to the lance 4 shown in FIG. When the lance 4 is inserted into the blower pipe 2, the supply side cooling fluid flow path portion 31 and the return side cooling fluid flow path portion 33 on the front end side of the collecting flow path portion 10 and the outer periphery of the collecting flow path portion 10 thereof. The front end side of the air is projected into the air duct 2.
A solid reducing agent supply means 41 (see FIG. 2) for supplying the solid reducing agent is connected to the rear end of the circular cross-sectional flow path portion 11, similarly to the lance 4 according to the first embodiment.

Further, the rear end portion of the incomplete circular cross-sectional flow path portion 13 is closed by a wall member (not shown), but the gas supply port 13a (FIG. 2) is connected, and the gas reducing agent supply means 42 (see FIG. 2) for supplying the gas reducing agent is connected to the gas supply port 13a.
Further, the rear end portion of the gap flow path portion 15 is closed by a wall member (not shown), but the wall member has a gas supply port 15a (see FIG. 2) as in the case of the lance 4 according to the first embodiment. Is connected, and a flammable gas supply means 43 (see FIG. 2) for supplying flammable gas is connected to the gas supply port 15a.

Further, the rear end portion of the second gap flow path portion 19 is closed by a wall member (not shown), and a gas supply port (not shown) is connected to the wall member, and a second gas supply port is connected to the gas supply port. A means for supplying the above-mentioned fluid flowing to the gap flow path portion 19 is connected.
Then, the solid reducing material (fine pulverized coal) is blown into the blower pipe 2 by the transport gas from the circular cross-sectional flow path portion 11 constituting the collecting flow path portion 10 of the lance 4, and at the same time, from the incomplete circular cross-section flow path portion 13. The gas reducing material (LNG) is blown into the blower pipe 2, the above-mentioned fluid is blown from the second gap flow path portion 19, and the flammable gas (oxygen) is blown into the blower pipe 2 from the gap flow path portion 15. Be blown in.

Then, the collecting flow path portion 10 of the lance 4 is cooled at the same time as the solid reducing agent, the gas reducing agent, and the flammable gas are blown into the blower pipe 2. In the cooling of the collecting flow path portion 10, the cooling fluid flows from the cooling fluid supply means 44 in the supply side cooling fluid flow path portion 31, and returns from the front end of the supply side cooling fluid flow path portion 31 in front of the lid 34a. It is carried out by flowing into the side cooling fluid flow path portion 33, returning to the rear side, and circulating this.
Here, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid body 34a arranged at the front end portion of the third outer peripheral pipe body 34 is not sufficiently cooled by the cooling fluid. On the other hand, similarly to the lance 4 shown in FIG. 3, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid 34a is located in the blower pipe 2 and is directly exposed to hot air. .. That is, the outer peripheral pipe body 16 forming the gap flow path portion 15 is directly exposed to the hot air.
However, as in the case of the lance 4 shown in FIG. 3, a flammable gas (oxygen) as a fluid flows through the gap flow path portion 15, and the blowing flow velocity thereof is relatively high, so that the outer peripheral tube 16 directly becomes hot air. Even if exposed, it can be appropriately cooled by a flammable gas.

Further, in the lance 4 according to the third embodiment, a circular cross-sectional flow flows around the outer periphery of the circular cross-section flow path portion 11 through which the solid reducing material as a solid flows and the incomplete circular cross-section flow path portion 13 through which the gas reducing material as a fluid flows. It is provided with a gap flow path portion 15 formed by an outer peripheral tube body 16 having a circular cross section provided so as to cover the road portion 11 and the front end portion of the incomplete circular cross-section flow path portion 13. The lance 4 has a second gap through which a fluid flows by a second tubular body 20 having a circular cross section provided so as to cover the circular cross-section flow path portion 11 and the incomplete circular cross-section flow path portion 13 in the gap flow path portion 15. The flow path portion 19 is formed. Therefore, the second is formed of the circular pipe body 12 forming the circular cross-section flow path portion 11 through which the solid flows, the vertically split pipe body 14 forming the incomplete circular cross-section flow path portion 13, and the second gap flow path portion 19. The two tubular bodies 20 are covered up to the front end portion by the outer peripheral tubular body 16 forming the gap flow path portion 15 through which the fluid flows. Therefore, the tubular body 12 having a circular cross section is not directly exposed to hot air, and is affected by the fluid flowing through the gap flow path portion 15, the fluid flowing through the incomplete circular cross section flow path portion 13, and the fluid flowing through the second gap flow path portion 19. Be cooled. Thereby, it is possible to provide a composite lance 4 for a blast furnace tuyere capable of appropriately cooling a pipe body 12 having a circular cross section forming a circular cross-section flow path portion 11 through which a solid flows.

(Fourth Embodiment)
Next, the composite lance for the blast furnace tuyere according to the fourth embodiment of the present invention will be described with reference to FIG.
FIG. 8 shows a lance for a blast furnace tuyere (hereinafter, simply referred to as a lance) 4 according to a fourth embodiment of the present invention.
The lance 4 shown in FIG. 8 has the same basic configuration as the lance 4 according to the first embodiment shown in FIG. 4, but the configuration of the collecting flow path portion 10 is different.
That is, the lance 4 shown in FIG. 8 is a third vertically divided pipe body provided in the gap flow path portion 15 in which the cross section of the pipe body is continuously cut out in the front-rear direction (longitudinal direction) to form an arc shape. Both ends of 22 are joined to a tubular body 12 having a circular cross section to form a third incomplete circular cross-section flow path portion 21 through which fluid flows, and the circular cross-section flow path portion 11, the incomplete circular cross-section flow path portion 13, and the first 3 The collecting flow path portion 10 is composed of the incomplete circular cross-section flow path portion 21 and the gap flow path portion 15. The fluid flowing through the third incomplete circular cross-section flow path portion 21 may be a gas reducing agent, a flammable gas or other fluid, for example, shale gas or C gas.

Here, a tubular body 12 having a circular cross section forming a circular cross-section flow path portion 11, a vertically split pipe body 14 forming an incomplete circular cross-section flow path portion 13, and a third incomplete circular cross-section flow path portion 21 are formed. The front ends of the three vertically split pipe bodies 22 and the outer peripheral pipe bodies 16 forming the gap flow path portion 15 are flush with each other, although not shown.
Specifically, the collecting flow path portion 10 will be described. As shown in FIG. 8, one circular cross-section flow path portion 11 is formed by one circular cross-section tube body 12, and the outer peripheral surface of the tube body 12 is formed. On the left side of the drawing, both ends in the circumferential direction of one vertically divided tubular body 14 having a cross section of about 1/2 arc are joined to form an incomplete circular cross-section flow path portion 13. Further, both ends in the circumferential direction of one third vertically divided tubular body 22 having a cross section of about 1/2 arc shape are joined to the right side of the outer peripheral surface of the tubular body 12, and the third incomplete circular cross-sectional flow path portion is formed. 21 is formed. Further, the pipe body 12 forming the circular cross-section flow path portion 11, the vertically split pipe body 14 forming the incomplete circular cross-section flow path portion 13, and the third vertically split pipe forming the third incomplete circular cross-section flow path portion 21. The front end of the body 22 is covered with an outer peripheral tube 16 having a circular cross section, and a gap flow path portion 15 is formed between the tube 12, the vertically split tube 14, and the third vertically split tube 22 and the outer tube 16. .. Then, the collecting flow path portion 10 is formed by these circular cross-section flow path portions 11, the incomplete circular cross-section flow path portion 13, the third incomplete circular cross-section flow path portion 21, and the gap flow path portion 15. In the present embodiment, the pipe body 12 that forms the circular cross-section flow path portion 11, the vertically split pipe body 14 that forms the incomplete circular cross-section flow path portion 13, and the third incomplete circular cross-section flow path portion 21 are formed. The outer peripheral pipe body 16 forming the vertically split pipe body 22 and the gap flow path portion 15 is made of a stainless steel pipe. Further, welding is used for joining the vertically divided pipe body 14 and the third vertically divided pipe body 22 to the pipe body 12.

Then, the lance 4 is inserted into the blower pipe 2 so that the insertion length from the front end portion of the collecting flow path portion 10 is l (approximately 200 mm), similarly to the lance 4 shown in FIG. When the lance 4 is inserted into the blower pipe 2, the supply side cooling fluid flow path portion 31 and the return side cooling fluid flow path portion 33 on the front end side of the collecting flow path portion 10 and the outer periphery of the collecting flow path portion 10 thereof. The front end side of the air is projected into the air duct 2.
A solid reducing agent supply means 41 (see FIG. 2) for supplying the solid reducing agent is connected to the rear end of the circular cross-sectional flow path portion 11, similarly to the lance 4 according to the first embodiment.

Further, the rear end portion of the incomplete circular cross-sectional flow path portion 13 is closed by a wall member (not shown), but the gas supply port 13a (FIG. 2) is connected, and the gas reducing agent supply means 42 (see FIG. 2) for supplying the gas reducing agent is connected to the gas supply port 13a.
Further, the rear end portion of the gap flow path portion 15 is closed by a wall member (not shown), but the wall member has a gas supply port 15a (see FIG. 2) as in the case of the lance 4 according to the first embodiment. Is connected, and a flammable gas supply means 43 (see FIG. 2) for supplying flammable gas is connected to the gas supply port 15a.

Further, the rear end portion of the third incomplete circular cross-section flow path portion 21 is closed by a wall member (not shown), and a gas supply port (not shown) is connected to the wall member, and the gas supply port is connected to the gas supply port. A means for supplying the above-mentioned fluid flowing through the third incomplete circular cross-section flow path portion 21 is connected.
Then, the solid reducing material (fine pulverized coal) is blown into the blower pipe 2 by the transport gas from the circular cross-sectional flow path portion 11 constituting the collecting flow path portion 10 of the lance 4, and at the same time, from the incomplete circular cross-section flow path portion 13. The gas reducing material (LNG) is blown into the blower pipe 2, the above-mentioned fluid is blown from the third incomplete circular cross-sectional flow path portion 21, and the flammable gas (oxygen) is blown from the gap flow path portion 15. It is blown into 2.

Then, the collecting flow path portion 10 of the lance 4 is cooled at the same time as the solid reducing agent, the gas reducing agent, and the flammable gas are blown into the blower pipe 2. In the cooling of the collecting flow path portion 10, the cooling fluid flows from the cooling fluid supply means 44 in the supply side cooling fluid flow path portion 31, and returns from the front end of the supply side cooling fluid flow path portion 31 in front of the lid 34a. It is carried out by flowing into the side cooling fluid flow path portion 33, returning to the rear side, and circulating this.
Here, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid body 34a arranged at the front end portion of the third outer peripheral pipe body 34 is not sufficiently cooled by the cooling fluid. On the other hand, similarly to the lance 4 shown in FIG. 3, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid 34a is located in the blower pipe 2 and is directly exposed to hot air. .. That is, the outer peripheral pipe body 16 forming the gap flow path portion 15 is directly exposed to the hot air.
However, a flammable gas (oxygen) as a fluid flows through the gap flow path portion 15, and the blowing flow velocity thereof is relatively high. Therefore, even if the outer peripheral tube 16 is directly exposed to hot air, the flammable gas is appropriate. Can be cooled to.

Further, in the lance 4 according to the fourth embodiment, the circular cross-sectional flow flows around the outer periphery of the circular cross-section flow path portion 11 through which the solid reducing material as a solid flows and the incomplete circular cross-section flow path portion 13 through which the gas reducing material as a fluid flows. The gap flow path portion 15 is formed by an outer peripheral tube body 16 having a circular cross section provided so as to cover the road portion 11 and the front end portion of the incomplete circular cross-section flow path portion 13. Then, the lance 4 has a circular cross section at both ends of the third vertically divided pipe body 22 which is provided in the gap flow path portion 15 and whose cross section is continuously cut out in the longitudinal direction to form an arc shape. It is joined to the tubular body 12 to form a third incomplete circular cross-sectional flow path portion 21 through which the fluid flows. Therefore, the tubular body 12 having a circular cross section forming the circular cross-section flow path portion 11 through which the solid flows, the vertically split tubular body 14 forming the incomplete circular cross-section flow path portion 13, and the third incomplete circular cross-section flow path portion 21 are provided. The third vertically split pipe body 22 to be formed is covered up to the front end portion thereof by the outer peripheral pipe body 16 forming the gap flow path portion 15 through which the fluid flows. Therefore, the tubular body 12 having a circular cross section is not directly exposed to hot air, and has a fluid flowing through the gap flow path portion 15, a fluid flowing through the incomplete circular cross section flow path portion 13, and a third incomplete circular cross section flow path portion 21. It is cooled by the flowing fluid. Thereby, it is possible to provide a composite lance 4 for a blast furnace tuyere capable of appropriately cooling a pipe body 12 having a circular cross section forming a circular cross-section flow path portion 11 through which a solid flows.

(Fifth Embodiment)
Next, the composite lance for the blast furnace tuyere according to the fifth embodiment of the present invention will be described with reference to FIG.
FIG. 9 shows a lance for a blast furnace tuyere (hereinafter, simply referred to as a lance) 4 according to a fifth embodiment of the present invention.
The lance 4 shown in FIG. 9 has the same basic configuration as the lance 4 according to the first embodiment shown in FIG. 4, but the configuration of the collecting flow path portion 10 is different.
That is, the lance 4 shown in FIG. 9 is a fourth vertically split pipe body provided in the gap flow path portion 15 in which the cross section of the pipe body is continuously cut out in the front-rear direction (longitudinal direction) to form an arc-shaped cross section. One end of 24 is joined to a pipe body 12 having a circular cross section, and the other end of the fourth vertically divided pipe body 24 is joined to a vertically divided pipe body 14, so that a fourth incomplete circular cross-section flow path portion 23 through which fluid flows flows. , The circular cross-section flow path portion 11, the incomplete circular cross-section flow path portion 13, the fourth incomplete circular cross-section flow path portion 23, and the gap flow path portion 15 constitute the collective flow path portion 10. The fluid flowing through the fourth incomplete circular cross-section flow path portion 23 may be a gas reducing agent, a flammable gas or other fluid, for example, shale gas or C gas.

Here, a tubular body 12 having a circular cross section forming a circular cross-section flow path portion 11, a vertically split pipe body 14 forming an incomplete circular cross-section flow path portion 13, and a fourth incomplete circular cross-section flow path portion 23 are formed. The front ends of the four vertically split pipes 24 and the outer peripheral pipes 16 forming the gap flow path portion 15 are flush with each other, although not shown.
Specifically, the collecting flow path portion 10 will be described. As shown in FIG. 9, one circular cross-section flow path portion 11 is formed by one circular cross-section tube body 12, and the outer peripheral surface of the tube body 12 is formed. An incomplete circular cross-section flow path portion 13 is formed by joining both ends in the circumferential direction of one vertically split pipe body 14 having a cross section of about 3/4 arc shape diagonally downward to the left in the drawing. Further, one fourth vertically divided pipe 24 having a cross section of about 1/3 arc shape is arranged diagonally upward to the left of the outer peripheral surface of the pipe 12, and one end of the fourth vertically divided pipe 24 in the circumferential direction is arranged. Along with joining to the outer peripheral surface of the pipe body 12, the other end in the circumferential direction of the fourth vertically divided pipe body 24 is joined to the outer peripheral surface of the vertically divided pipe body 14 to form the fourth incomplete circular cross-section flow path portion 23. do. Further, the pipe body 12 forming the circular cross-section flow path portion 11, the vertically split pipe body 14 forming the incomplete circular cross-section flow path portion 13, and the fourth vertically split pipe forming the fourth incomplete circular cross-section flow path portion 23. The front end of the body 24 is covered with an outer peripheral tube body 16 having a circular cross section, and a gap flow path portion 15 is formed between the tube body 12, the vertically split tube body 14, the fourth vertically divided tube body 24, and the outer peripheral tube body 16. .. Then, the collecting flow path portion 10 is formed by these circular cross-section flow path portions 11, the incomplete circular cross-section flow path portion 13, the fourth incomplete circular cross-section flow path portion 23, and the gap flow path portion 15. In the present embodiment, the pipe body 12 that forms the circular cross-section flow path portion 11, the vertically split pipe body 14 that forms the incomplete circular cross-section flow path portion 13, and the fourth incomplete circular cross-section flow path portion 23 are formed. The outer peripheral pipe body 16 forming the vertically split pipe body 24 and the gap flow path portion 15 is made of a stainless steel pipe. Further, welding is used for joining the vertically divided pipe body 14 to the pipe body 12 and joining the fourth vertically divided pipe body 24 to the pipe body 12 and the vertically divided pipe body 14.

Then, the lance 4 is inserted into the blower pipe 2 so that the insertion length from the front end portion of the collecting flow path portion 10 is l (approximately 200 mm), similarly to the lance 4 shown in FIG. When the lance 4 is inserted into the blower pipe 2, the supply side cooling fluid flow path portion 31 and the return side cooling fluid flow path portion 33 on the front end side of the collecting flow path portion 10 and the outer periphery of the collecting flow path portion 10 thereof. The front end side of the air is projected into the air duct 2.
A solid reducing agent supply means 41 (see FIG. 2) for supplying the solid reducing agent is connected to the rear end of the circular cross-sectional flow path portion 11, similarly to the lance 4 according to the first embodiment.

Further, the rear end portion of the incomplete circular cross-sectional flow path portion 13 is closed by a wall member (not shown), but the gas supply port 13a (FIG. 2) is connected, and the gas reducing agent supply means 42 (see FIG. 2) for supplying the gas reducing agent is connected to the gas supply port 13a.
Further, the rear end portion of the gap flow path portion 15 is closed by a wall member (not shown), but the wall member has a gas supply port 15a (see FIG. 2) as in the case of the lance 4 according to the first embodiment. Is connected, and a flammable gas supply means 43 (see FIG. 2) for supplying flammable gas is connected to the gas supply port 15a.

Further, the rear end portion of the fourth incomplete circular cross-sectional flow path portion 23 is closed by a wall member (not shown), and a gas supply port (not shown) is connected to the wall member, and the gas supply port is connected to the gas supply port. A means for supplying the above-mentioned fluid flowing through the fourth incomplete circular cross-section flow path portion 23 is connected.
Then, the solid reducing material (fine pulverized coal) is blown into the blower pipe 2 by the transport gas from the circular cross-sectional flow path portion 11 constituting the collecting flow path portion 10 of the lance 4, and at the same time, from the incomplete circular cross-section flow path portion 13. The gas reducing material (LNG) is blown into the blower pipe 2, the above-mentioned fluid is blown from the fourth incomplete circular cross-sectional flow path portion 23, and the flammable gas (oxygen) is blown from the gap flow path portion 15. It is blown into 2.

Then, the collecting flow path portion 10 of the lance 4 is cooled at the same time as the solid reducing agent, the gas reducing agent, and the flammable gas are blown into the blower pipe 2. In the cooling of the collecting flow path portion 10, the cooling fluid flows from the cooling fluid supply means 44 in the supply side cooling fluid flow path portion 31, and returns from the front end of the supply side cooling fluid flow path portion 31 in front of the lid 34a. It is carried out by flowing into the side cooling fluid flow path portion 33, returning to the rear side, and circulating this.
Here, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid body 34a arranged at the front end portion of the third outer peripheral pipe body 34 is not sufficiently cooled by the cooling fluid. On the other hand, similarly to the lance 4 shown in FIG. 3, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid 34a is located in the blower pipe 2 and is directly exposed to hot air. .. That is, the outer peripheral pipe body 16 forming the gap flow path portion 15 is directly exposed to the hot air.
However, a flammable gas (oxygen) as a fluid flows through the gap flow path portion 15, and the blowing flow velocity thereof is relatively high. Therefore, even if the outer peripheral tube 16 is directly exposed to hot air, the flammable gas is appropriate. Can be cooled to.

Further, in the lance 4 according to the fifth embodiment, the circular cross-sectional flow flows around the outer periphery of the circular cross-section flow path portion 11 through which the solid reducing material as a solid flows and the incomplete circular cross-section flow path portion 13 through which the gas reducing material as a fluid flows. It is provided with a gap flow path portion 15 formed by an outer peripheral tube body 16 having a circular cross section provided so as to cover the road portion 11 and the front end portion of the incomplete circular cross-section flow path portion 13. The lance 4 is one end of a fourth vertically divided pipe body 24 provided in the gap flow path portion 15 in which the cross section of the pipe body is continuously cut out in the front-rear direction (longitudinal direction) to form an arc shape. Is joined to the pipe body 12 having a circular cross section, and the other end of the fourth vertically split pipe body 24 is joined to the vertically split pipe body 14 to form a fourth incomplete circular cross-section flow path portion 23 through which fluid flows. There is. Therefore, the circular pipe body 12 forming the circular cross-section flow path portion 11 through which the solid flows, the vertically split pipe body 14 forming the incomplete circular cross-section flow path portion 13, and the fourth incomplete circular cross-section flow path portion 23 are formed. The fourth vertically split pipe body 24 to be formed is covered up to the front end portion thereof by the outer peripheral pipe body 16 forming the gap flow path portion 15 through which the fluid flows. Therefore, the tubular body 12 having a circular cross section is not directly exposed to hot air, and has a fluid flowing through the gap flow path portion 15, a fluid flowing through the incomplete circular cross section flow path portion 13, and a fourth incomplete circular cross section flow path portion 23. It is cooled by the flowing fluid. Thereby, it is possible to provide a composite lance 4 for a blast furnace tuyere capable of appropriately cooling a pipe body 12 having a circular cross section forming a circular cross-section flow path portion 11 through which a solid flows.

(Sixth Embodiment)
Next, the composite lance for the blast furnace tuyere according to the sixth embodiment of the present invention will be described with reference to FIG.
FIG. 10 shows a lance for a blast furnace tuyere (hereinafter, simply referred to as a lance) 4 according to a sixth embodiment of the present invention.
The lance 4 shown in FIG. 10 has the same basic configuration as the lance 4 according to the first embodiment shown in FIG. 4, but the configuration of the collecting flow path portion 10 is different.
That is, the lance 4 shown in FIG. 10 is formed by a tubular body 12 having a circular cross section, and a circular cross-sectional flow path portion 11 through which a solid flows and a tubular body 26 having a non-circular cross section are joined to the tubular body 12 having a circular cross section. The non-circular cross-sectional flow path portion 25 through which the fluid flows, and the outer periphery of the circular cross-section flow path portion 11 and the non-circular cross-section flow path portion 25 are covered with the circular cross-section flow path portion 11 and the front end portion of the non-circular cross-section flow path portion 25. It is formed by an outer peripheral tube body 16 having a circular cross section, and is provided with a gap flow path portion 15 through which fluid flows, and is assembled by a circular cross section flow path portion 11, a non-circular cross section flow path portion 25, and a gap flow path portion 15. The flow path portion 10 is formed. The fluid flowing through the non-circular cross-sectional flow path portion 25 may be a gas reducing agent, a flammable gas or other fluid, for example, shale gas or C gas.

Here, a tubular body 12 having a circular cross section forming a circular cross-section flow path portion 11, a vertically split pipe body 14 forming an incomplete circular cross-section flow path portion 13, and a fourth incomplete circular cross-section flow path portion 23 are formed. The front ends of the four vertically split pipes 24 and the outer peripheral pipes 16 forming the gap flow path portion 15 are flush with each other, although not shown.
Specifically, the collecting flow path portion 10 will be described. As shown in FIG. 10, one circular cross-section flow path portion 11 is formed by one tubular body 12 having a circular cross section, and the outer peripheral surface of the tubular body 12 is formed. One tube body 26 having a non-circular cross section is arranged on the left side of the drawing, and the tube body 26 is joined to the tube body 12. The non-circular cross-sectional flow path portion 25 is formed in a space surrounded by a tube body 26 having a non-circular cross section. The tube body 26 having a non-circular cross section is manufactured by deforming a tube body having a circular cross section. Further, the pipe body 12 forming the circular cross-section flow path portion 11 and the front end portion of the non-circular cross-section flow path portion 26 forming the non-circular cross-section flow path portion 25 are covered with the outer peripheral tube body 16 having a circular cross section, and the tube body 12 and A gap flow path portion 15 is formed between the tubular body 26 having a non-circular cross section and the outer peripheral tubular body 16. Then, the collecting flow path portion 10 is formed by the circular cross-section flow path portion 11, the non-circular cross-section flow path portion 25, and the gap flow path portion 15. In the present embodiment, the pipe body 12 that forms the circular cross-section flow path portion 11, the pipe body 26 that forms the non-circular cross-section flow path portion 25, and the outer peripheral pipe body 16 that forms the gap flow path portion 15 are Made of stainless steel pipe. Further, welding is used for joining the pipe body 26 having a non-circular cross section to the pipe body 12.

Then, the lance 4 is inserted into the blower pipe 2 so that the insertion length from the front end portion of the collecting flow path portion 10 is l (approximately 200 mm), similarly to the lance 4 shown in FIG. When the lance 4 is inserted into the blower pipe 2, the supply side cooling fluid flow path portion 31 and the return side cooling fluid flow path portion 33 on the front end side of the collecting flow path portion 10 and the outer periphery of the collecting flow path portion 10 thereof. The front end side of the air is projected into the air duct 2.
A solid reducing agent supply means 41 (see FIG. 2) for supplying the solid reducing agent is connected to the rear end of the circular cross-sectional flow path portion 11, similarly to the lance 4 according to the first embodiment.

Further, the rear end portion of the non-circular cross-sectional flow path portion 25 is closed by a wall member (not shown), but the wall member has a gas supply port 13a (FIG. 2) as in the case of the lance 4 according to the first embodiment. (See) is connected, and the gas reducing agent supply means 42 (see FIG. 2) for supplying the gas reducing agent is connected to the gas supply port 13a.
Further, the rear end portion of the gap flow path portion 15 is closed by a wall member (not shown), but the wall member has a gas supply port 15a (see FIG. 2) as in the case of the lance 4 according to the first embodiment. Is connected, and a flammable gas supply means 43 (see FIG. 2) for supplying flammable gas is connected to the gas supply port 15a.

Then, the solid reducing material (pulverized coal) is blown into the blower pipe 2 by the conveyed gas from the circular cross-section flow path portion 11 constituting the collecting flow path portion 10 of the lance 4, and at the same time, the gas is blown from the non-circular cross-section flow path portion 25. The reducing material (LNG) is blown into the blower pipe 2, and the flammable gas (oxygen) is blown into the blower pipe 2 from the gap flow path portion 15.
Then, the collecting flow path portion 10 of the lance 4 is cooled at the same time as the solid reducing agent, the gas reducing agent, and the flammable gas are blown into the blower pipe 2. In the cooling of the collecting flow path portion 10, the cooling fluid flows from the cooling fluid supply means 44 in the supply side cooling fluid flow path portion 31, and returns from the front end of the supply side cooling fluid flow path portion 31 in front of the lid 34a. It is carried out by flowing into the side cooling fluid flow path portion 33, returning to the rear side, and circulating this.

Here, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid body 34a arranged at the front end portion of the third outer peripheral pipe body 34 is not sufficiently cooled by the cooling fluid. On the other hand, similarly to the lance 4 shown in FIG. 3, the portion on the front end side of the collecting flow path portion 10 projecting forward with respect to the lid 34a is located in the blower pipe 2 and is directly exposed to hot air. .. That is, the outer peripheral pipe body 16 forming the gap flow path portion 15 is directly exposed to the hot air.
However, a flammable gas (oxygen) as a fluid flows through the gap flow path portion 15, and the blowing flow velocity thereof is relatively high. Therefore, even if the outer peripheral tube 16 is directly exposed to hot air, the flammable gas is appropriate. Can be cooled to.

Further, in the lance 4 according to the sixth embodiment, the circular cross-section flow path is formed on the outer periphery of the circular cross-section flow path portion 11 through which the solid reducing material as a solid flows and the non-circular cross-section flow path portion 25 through which the gas reducing material as a fluid flows. It is formed by an outer peripheral tube body 16 having a circular cross section provided so as to cover the portion 11 and the front end portion of the non-circular cross-section flow path portion 25, and includes a gap flow path portion 15 through which a flammable gas as a fluid flows. Therefore, the circular pipe body 12 forming the circular cross-section flow path portion 11 through which the solid flows and the non-circular cross-section flow path portion 25 forming the non-circular cross-section flow path portion 25 form the gap flow path portion 15 through which the fluid flows. The outer peripheral tubular body 16 to be formed covers the front end portion thereof. Therefore, the tubular body 12 having a circular cross section is not directly exposed to hot air, but is cooled by the fluid flowing through the gap flow path portion 15 and the fluid flowing through the non-circular cross section flow path portion 25. Thereby, it is possible to provide a composite lance 4 for a blast furnace tuyere capable of appropriately cooling a pipe body 12 having a circular cross section forming a circular cross-section flow path portion 11 through which a solid flows.

Further, in the case of the lance 4 according to the sixth embodiment, a pipe body 26 having a non-circular cross section is used instead of the vertically divided pipe body 14 in the lance 4 according to the first embodiment, and the pipe body 26 having a non-circular cross section is used. It is designed to be joined to the tube body 12. When manufacturing the vertically split pipe body 14, it is necessary to cut the pipe body having a circular cross section continuously in the longitudinal direction to make the cross section into a 3/4 arc shape, and the manufacturing thereof is not easy. On the other hand, since the pipe body 26 having a non-circular cross section can be manufactured by deforming the pipe body having a circular cross section, the manufacturing thereof is easier than that of a vertically split pipe body. Therefore, the lance 4 according to the sixth embodiment can be manufactured more easily than the lance 4 according to the first embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to this, and various modifications and improvements can be made.
For example, in the lance 4 according to the first embodiment shown in FIGS. 1 to 5, the gas reducing material supply means 42 for supplying the gas reducing material is connected to the incomplete circular cross-sectional flow path portion 13 to supply the flammable gas. The flammable gas supply means 43 is connected to the gap flow path portion 15, but the gas reducing agent supply means 42 is connected to the gap flow path portion 15 and the flammable gas supply means 43 is connected to the incomplete circular cross-sectional flow. It may be connected to the road portion 13. That is, the combustion-supporting gas supply means 43 for supplying the combustion-supporting gas is connected to either the incomplete circular cross-section flow path portion 13 or the gap flow path portion 15, and the gas reduction material supply means for supplying the gas reduction material. 42 may be connected to either one of the incomplete circular cross-section flow path portion 13 and the gap flow path portion 15.

Further, in the lance 4 according to the second embodiment shown in FIG. 6, the gas reducing material supply means 42 for supplying the gas reducing material is connected to the incomplete circular cross-sectional flow path portion 13, and the combustion supporting gas for supplying the flammable gas is connected. The sex gas supply means 43 is connected to the gap flow path portion 15, and the means for supplying the above-mentioned fluid is connected to the second incomplete circular cross-section flow path portion 17, but the fuel-supporting gas is supplied. A gas reducing material supply means in which the gas supplying means 43 is connected to any one of the incomplete circular cross-section flow path portion 13, the second incomplete circular cross-section flow path portion 17, and the gap flow path portion 15 to supply the gas reducing material. 42 is connected to any one of the circular cross-section flow path portion 11, the second incomplete circular cross-section flow path portion 17, and the gap flow path portion 15, and the means for supplying the above-mentioned gas is the circular cross-section flow path portion 11. , It may be connected to the remaining one of the second incomplete circular cross-section flow path portion 17 and the gap flow path portion 15.

Further, in the lance 4 according to the third embodiment shown in FIG. 7, the gas reducing material supply means 42 for supplying the gas reducing material is connected to the incomplete circular cross-sectional flow path portion 13, and the combustion supporting gas for supplying the flammable gas is connected. The sex gas supply means 43 is connected to the gap flow path portion 15, and the means for supplying the above-mentioned fluid is connected to the second incomplete circular cross-section flow path portion 17, but the fuel-supporting gas is supplied. The gas supply means 43 is connected to any one of the incomplete circular cross-sectional flow path portion 13, the second gap flow path portion 19, and the gap flow path portion 15, and the gas reduction material supply means 42 for supplying the gas reduction material is not available. The means for supplying the above-mentioned fluid, which is connected to any one of the completely circular cross-section flow path portion 13, the second gap flow path portion 19, and the gap flow path portion 15, is the circular cross-section flow path portion 11, the second gap. It may be connected to the remaining one of the flow path portion 19 and the gap flow path portion 15.

Further, in the lance 4 according to the fourth embodiment shown in FIG. 8, the gas reducing material supply means 42 for supplying the gas reducing material is connected to the incomplete circular cross-sectional flow path portion 13, and the combustion supporting gas for supplying the flammable gas is connected. The sex gas supply means 43 is connected to the gap flow path portion 15, and the means for supplying the above-mentioned fluid is connected to the third incomplete circular cross-section flow path portion 21, but the flammable gas is supplied. A gas reducing material supply means in which the gas supply means 43 is connected to any one of the incomplete circular cross-section flow path portion 13, the third incomplete circular cross-section flow path portion 21, and the gap flow path portion 15 to supply the gas reducing material. 42 is connected to any one of the incomplete circular cross-section flow path portion 13, the third incomplete circular cross-section flow path portion 21, and the gap flow path portion 15, and the means for supplying the above-mentioned gas is the circular cross-section flow path. It may be connected to the remaining one of the portion 11, the third incomplete circular cross-section flow path portion 21, and the gap flow path portion 15.

Further, in the lance 4 according to the fifth embodiment shown in FIG. 9, the gas reducing material supply means 42 for supplying the gas reducing material is connected to the incomplete circular cross-sectional flow path portion 13, and the combustion supporting gas is supplied. The sex gas supply means 43 is connected to the gap flow path portion 15, and the means for supplying the above-mentioned fluid is connected to the fourth incomplete circular cross-section flow path portion 23. The gas reducing material supply means in which the gas supply means 43 is connected to any one of the incomplete circular cross-section flow path portion 13, the fourth incomplete circular cross-section flow path portion 23, and the gap flow path portion 15 to supply the gas reducing material. 42 is connected to any one of the incomplete circular cross-section flow path portion 13, the fourth incomplete circular cross-section flow path portion 23, and the gap flow path portion 15, and the means for supplying the above-mentioned gas is the circular cross-section flow path. It may be connected to the remaining one of the portion 11, the fourth incomplete circular cross-section flow path portion 23, and the gap flow path portion 15.

Further, in the lance 4 according to the sixth embodiment shown in FIG. 10, the gas reducing material supplying means 42 for supplying the gas reducing material is connected to the non-circular cross-sectional flow path portion 25, and is flammable to supply the flammable gas. Although the gas supply means 43 is connected to the gap flow path portion 15, the gas reducing agent supply means 42 is connected to the gap flow path portion 15, and the flammable gas supply means 43 is connected to the non-circular cross-section flow path portion 25. You may try to do so. That is, the combustion-supporting gas supply means 43 for supplying the combustion-supporting gas is connected to either the non-circular cross-section flow path portion 25 or the gap flow path portion 15, and the gas reduction material supply means 42 for supplying the gas reduction material. May be connected to either the non-circular cross-section flow path portion 25 or the gap flow path portion 15.

1 blast furnace 2 blower pipe 3 tuyere 4 composite lance for blast furnace tuyere 5 raceway 10 collecting flow path 11 circular cross-section flow path 12 circular cross-section tube 13 incomplete circular cross-section flow path 14 vertically split tube 15 gap Flow path 16 Outer peripheral tube 17 Second incomplete circular cross-section Flow path 18 Second vertical split tube 19 Second gap flow path 20 Second tube 21 Third incomplete circular cross-section Flow path 22 Third vertical Split pipe body 23 4th incomplete circular cross-section flow path part 24 4th vertical split pipe body 25 Non-circular cross-section flow path part 26 Cross-section non-circular pipe body 31 Supply side cooling fluid flow path part 32 2nd outer peripheral pipe body 33 Return Side cooling fluid flow path 34 Third outer tube

Claims (14)

A circular cross-sectional flow path formed by a tubular body having a circular cross section and a vertical cross-sectional flow path portion through which a solid flows, and both ends of a vertically divided tubular body in which the cross section of the tubular body is continuously cut out in the longitudinal direction to form an arc shape, are said to have a circular cross section. An incomplete circular cross-sectional flow path portion formed by joining to a tubular body and through which a fluid flows, and the circular cross-section flow path portion and the incomplete circular shape on the outer periphery of the circular cross-section flow path portion and the incomplete circular cross-section flow path portion. The circular cross-sectional flow path is formed by an outer peripheral tube having a circular cross section provided so as to cover the end of the cross-sectional flow path portion on the side to be inserted into the blower pipe in the longitudinal direction, and includes a gap flow path portion through which fluid flows. A composite lance for a blast furnace tuyere, characterized in that a collecting flow path portion is formed by a portion, the incomplete circular cross-sectional flow path portion, and the gap flow path portion. Both ends of the second vertically split pipe body, which is provided in the gap flow path portion so as to cover the incomplete circular cross-section flow path portion and has a cross section formed into an arc shape by continuously cutting out the cross section of the pipe body in the longitudinal direction. The circular cross-section flow path portion, the circular cross-section flow path portion, the incomplete circular cross-section flow path portion, and the second imperfect The composite lance for a blast furnace tuyere according to claim 1, wherein the collecting flow path portion is formed by a circular cross-section flow path portion and the gap flow path portion. A second gap flow path portion formed by a second tubular body having a circular cross section provided so as to cover the circular cross-section flow path portion and the incomplete circular cross-section flow path portion in the gap flow path portion, and includes a second gap flow path portion through which fluid flows. The first aspect of the present invention, wherein the collecting flow path portion is formed by the circular cross-section flow path portion, the incomplete circular cross-section flow path portion, the second gap flow path portion, and the gap flow path portion. Composite lance for blast furnace tuyere. Formed by joining both ends of a third vertically split pipe body, which is provided in the gap flow path portion and has a cross section continuously cut in the longitudinal direction to form an arc shape, to the pipe body having a circular cross section. It is provided with a third incomplete circular cross-section flow path portion through which fluid flows, and is provided by the circular cross-section flow path portion, the incomplete circular cross-section flow path portion, the third incomplete circular cross-section flow path portion, and the gap flow path portion. The composite lance for a blast furnace tuyere according to claim 1, wherein the collecting flow path portion is formed. One end of a fourth vertically split pipe body provided in the gap flow path portion, in which the cross section of the pipe body is continuously cut out in the longitudinal direction and the cross section is arcuate, is joined to the pipe body having a circular cross section. A fourth incomplete circular cross-section flow path portion formed by joining the other end of the fourth vertically split tube body to the vertically split tube body and through which a fluid flows, the circular cross-section flow path portion, and the incomplete circular cross section. The composite lance for a blast furnace tuyere according to claim 1, wherein the collecting flow path portion is formed by the flow path portion, the fourth incomplete circular cross-section flow path portion, and the gap flow path portion. A circular cross-sectional flow path formed by a tubular body having a circular cross section and a non-circular cross-sectional flow path portion through which a solid flows, and a non-circular cross-sectional flow path portion formed by joining a non-circular cross-sectional tube body to the circular tube body and flowing a fluid. By an outer peripheral tube having a circular cross section provided on the outer periphery of the circular cross section flow path portion and the non-circular cross section flow path portion so as to cover the circular cross section flow path portion and one end portion in the longitudinal direction of the non-circular cross section flow path portion. A blast furnace tuyere is provided with a gap flow path portion formed and through which a fluid flows, and a collecting flow path portion is formed by the circular cross-section flow path portion, the non-circular cross-section flow path portion, and the gap flow path portion. For compound lance. A second outer peripheral tube having a circular cross section is provided on the outer periphery of the outer peripheral tube constituting the collecting flow path portion, and the gap between the outer peripheral tube body and the second outer peripheral tube body is used to cool the collecting flow path portion. The composite lance for a blast furnace tuyere according to any one of claims 1 to 6, wherein the cooling fluid flow path portion on the supply side for the cooling fluid is used. The composite lance for a blast furnace tuyere according to any one of claims 1 to 7, wherein the solid reducing agent supplying means for supplying the solid reducing material is connected to the circular cross-sectional flow path portion through which the solid flows. .. A gas reducing material that supplies a gas reducing material by connecting the combustion supporting gas supply means for supplying the combustion-supporting gas to either the incomplete circular cross-section flow path portion through which the fluid flows or the gap flow path portion. The composite lance for a blast furnace tuyere according to claim 1, wherein the supply means is connected to either one of the incomplete circular cross-section flow path portion through which the fluid flows and the gap flow path portion. The flammable gas supply means for supplying the flammable gas is connected to any one of the incomplete circular cross-section flow path portion through which the fluid flows, the second incomplete circular cross-section flow path portion, and the gap flow path portion. The gas reducing material supply means for supplying the gas reducing material is any one of the incomplete circular cross-section flow path portion, the second incomplete circular cross-section flow path portion, and the gap flow path portion through which the fluid flows. The composite lance for a blast furnace tuyere according to claim 2, wherein the compound lance is connected to a blast furnace tuyere. The flammable gas supply means for supplying the flammable gas is connected to any one of the incomplete circular cross-section flow path portion through which the fluid flows, the second gap flow path portion, and the gap flow path portion, and is a gas. The gas reducing material supply means for supplying the reducing material is connected to any one of the incomplete circular cross-section flow path portion through which the fluid flows, the second gap flow path portion, and the gap flow path portion. The composite lance for a blast furnace tuyere according to claim 3, which is characterized. The flammable gas supply means for supplying the flammable gas is connected to any one of the incomplete circular cross-section flow path portion through which the fluid flows, the third incomplete circular cross-section flow path portion, and the gap flow path portion. The gas reducing material supply means for supplying the gas reducing material is any one of the incomplete circular cross-section flow path portion through which the fluid flows, the third incomplete circular cross-section flow path portion, and the gap flow path portion. The composite lance for a blast furnace tuyere according to claim 4, wherein the compound lance is connected to a blast furnace tuyere. The flammable gas supply means for supplying the flammable gas is connected to any one of the incomplete circular cross-section flow path portion through which the fluid flows, the fourth incomplete circular cross-section flow path portion, and the gap flow path portion. The gas reducing material supply means for supplying the gas reducing material is any one of the incomplete circular cross-section flow path portion through which the fluid flows, the fourth incomplete circular cross-section flow path portion, and the gap flow path portion. The composite lance for a blast furnace tuyere according to claim 5, wherein the compound lance is connected to a blast furnace tuyere. A gas reducing material supply in which a combustion-supporting gas supply means for supplying a combustion-supporting gas is connected to any one of the non-circular cross-sectional flow path portion through which the fluid flows and the gap flow path portion to supply a gas reducing material. The composite lance for a blast furnace tuyere according to claim 6, wherein the means is connected to any one of the non-circular cross-section flow path portion and the gap flow path portion through which the fluid flows.

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