JPH0367215B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves inserting a probe into and near the tuyere raceway of a vertical furnace such as a blast furnace or direct reduction furnace to collect samples of the furnace contents, gas, temperature, etc. The present invention also relates to a device for investigating the inside of a vertical furnace for observing the inside of the furnace.

This will be explained below using a blast furnace as an example.

The flow state of melts and solids near the blast furnace raceway has long been a subject of interest in elucidating phenomena such as tuyere melting and slag return to the tuyeres.

It is generally considered difficult to insert a probe during operation because this area is high temperature, is filled with a coke layer, and is subject to a locally large heat load due to flowing molten iron. However, conventionally, as shown in Figure 4, a water-cooled pipe was inserted into the raceway space from the tuyere during blast furnace operation as a tuyere probe during blast furnace operation.
There was a so-called raceway probe 1 that measures the composition and temperature of gas. (Utility Model Publication No. 53-133685) Such a raceway probe 1 provides information regarding the gas composition and temperature within the raceway space in region A where the probe is inserted and moves, that is, a narrow region approximately on the central axis of the tuyere. It is not possible to obtain information about the movement of melts and solids, gas composition, temperature, etc. in spaces other than this region A and in the region filled with coke. Furthermore, since the cross-sectional area of the tuyere is reduced by inserting the probe, the original raceway space cannot be obtained.

In recent years, attempts have been made at steel mills around the world to inject pulverized coal through tuyeres. Under these circumstances, the behavior of solids and molten materials in and around the tuyere raceway will influence the efficiency of the entire steelmaking process, and the reactions and melting in and around the raceway will be more important than ever. Technology to detect and control liquid flow phenomena will become important.

The present invention is aimed at responding to such technological developments and eliminating the shortcomings of the conventional technology. A hemispherical tip contacts the inside of the tuyere and closes the space between the tuyere and the probe, and a seal pipe that can swing freely around the hemispherical tip; A probe that can be inserted into the furnace more freely; an advancement/retraction drive device that moves the probe forward and backward; and a movement drive device that tilts the advancement/retraction drive device horizontally and vertically about the contact portion between the hemispherical end of the seal pipe and the tuyere. It is equipped with a free tilting device.

In other words, a probe equipped with an advancing/retracting drive device and a device that can freely tilt vertically and horizontally is installed, and the air blowing from one tuyere that is in operation is stopped, and from the tuyere where the air blowing is stopped, the probe is placed inside the adjacent raceway. This probe can be inserted at any position within the coke packed bed around the area, allowing sampling of charges, gas, dust, temperature, melted materials, etc., as well as observation of the inside of the furnace using a fiberscope, allowing various observations and measurements. This is a device for exploring the inside of a vertical furnace, which makes it possible to collect samples.

With this device, it is possible to insert a probe at any three-dimensional position within the coke packed bed, including inside the raceway. It is possible to explore the distribution of the amount of dripping in the body and observe the swirling of coke and the flow of melt. This makes it possible, for example, to clarify the flow state of melts and solids near the blast furnace raceway, elucidate phenomena such as tuyere melting and slag return to the tuyeres, and prevent these. Ta. In addition, by obtaining information such as temperature, pressure, gas composition, melt composition, melt flow, etc. in and around the raceway, we can investigate reactions and melt flow phenomena in and around the raceway. By elucidating the mechanism behind this, it has become possible to control blast furnace operations at a higher level.

An embodiment of the apparatus of the present invention is shown in FIGS. 1 and 2. The movement of probe 1 is 2 parallel to the axis of probe 1.
Set of drive cylinders 5a, 5b and cylinder rod 6
a, 6b and the desk 7.
That is, a chuck stand 7, which is a movable stand, is fixed to the cylinder rods 6a, 6b of the drive cylinders 5a, 5b, and a chuck cylinder is mounted on this chuck stand 7 in a direction perpendicular to the axis of the probe 1.
A normal chuck (grip) is attached to the tip of the cylinder rod of this chuck cylinder, which grips the probe 1 and moves the probe 1 forward or backward by operating the drive cylinders 5a and 5b. There is. The drive method for this probe 1 does not necessarily have to be a hydraulic cylinder, and may be a chain drive method.

A device having these structures is referred to as a forward/backward drive device 19. The forward/backward drive device 19 is mounted on a frame 8, and hydraulic cylinders 9a, 9b, 9c, and 9d are attached to the lower end of the frame 8 so as to be extendable and retractable in the vertical direction. It is being These hydraulic cylinders perform leveling and tilting of the frame 8. In other words, hydraulic cylinders 9a, 9b and hydraulic cylinder 9c,
By changing the height of 9d, the forward/backward drive device 19 is tilted, and the insertion direction of the probe 1 is changed within the vertical plane. At the bottom of the level adjustment and tilting hydraulic cylinders 9a, 9b, 9c, and 9d, there is a frame 8a and a roll 10 at its lower end.
is attached, and the roll 10 is movable in the circumferential direction along the guide groove 12 with respect to the blast furnace main body. As shown in FIG. 2, this makes it possible to move the forward/backward driving device 19 for the probe 1 in the circumferential direction with respect to the furnace body, and in turn, the probe 1 can be moved in a horizontal plane. The probe 1 can be inserted anywhere in and around the adjacent raceway by means of a universal tilting device 11 that tilts the probe 1 and moves it circumferentially relative to the blast furnace body. In this case, the blow pipe 2, gas on-off valve 3, and gas seal device 4 also move together. In this case, 20 tuyeres
The inner surface of the blow pipe 2 is in spherical contact with the tip of the blow pipe 2, and the structure is such that there is no gas leakage even if the probe 1 is tilted horizontally and vertically about this spherical contact.

When the probe is inserted into the reactor contents by the advancing/retracting drive device 19, the probe receives a reaction force.
In response to this reaction force, the frame 8 on which the forward/backward drive device 19 is mounted is connected to the universal joint 13, the connecting rods 14, 1
It is fixed to the blast furnace wall through 6. Since the lengths of the connecting rods 14 and 16 change when the probe 1 is tilted horizontally or vertically, this fixation is adjusted by interposing a hydraulic cylinder 15 in the middle of the connecting rods 14 and 16. .

Gas leakage inside the furnace is prevented by the seal pipe 2. The seal pipe 2 is fixed by a universal joint 13, a hydraulic cylinder 17, and a connecting rod 18.

The device does not necessarily have to be moved continuously during operation when the air blowing of any one tuyere is stopped and the probe is inserted at any position in the coke packed bed including the adjacent tuyere raceway. For example, the device may be set in advance to insert the probe at a predetermined arbitrary position using the above function during a wind break.

Next, using the in-furnace exploration device of the present invention, while the blast furnace is in operation, the air blowing from one tuyere is stopped, and the probe is inserted at any position in and around the adjacent tuyere raceway. Explain how.

Figure 3 shows one tuyere that stops blowing air during operation. A blind flange 27 is attached to the lower end of the upper bend 26 of the blowing branch pipe to stop blowing air through one tuyere. Next, the lower bend 29 and blow pipe 30 shown by broken lines in the figure are removed. After removal, as shown in FIG. 1, connect the seal pipe 2, gas on-off valve 3, and gas seal device 4,
It is fixed by a hydraulic cylinder 17 and a connecting rod 18. Thereafter, as shown in FIG. 2, the in-furnace exploration device of the present invention is used to insert a probe into any position within the coke packed bed, including inside the raceway, and perform various observations.
Measure temperatures, collect samples, etc.

Next, the effects of the device of the present invention will be explained by giving examples. The in-furnace exploration apparatus according to the embodiment of the present invention shown in FIG. 1 was installed in a #24 tuyere front cast bed of a real blast furnace having an internal volume of 2800 m ³ . #24 tuyere was blinded as shown in Figure 3, and air blowing was stopped. #23 adjacent to this tuyere,
The probe was inserted at any position within the coke packed bed, including within the raceway of the #25 tuyere. The probe is triple tube (outer tube 60A, middle tube 40A, inner tube 10
A) It is a water-cooled system, and has functions that allow observation of the swirling and combustion of coke in the raceway and the flow of melt between raceways, measurement of temperature, and sampling of melt and gas using a fiberscope. have. The probe is inserted into any position near the raceway by a fully hydraulically driven, chuck gripping and retracting drive system with a maximum thrust of 10 tons. The insertion thrust from the tuyeres when the blowing was stopped to the coke-filled bed near the raceway was about 3 to 4 tons, and the fixing method of the present invention sufficiently withstood and functioned against the reaction force during insertion and withdrawal.

Next, as shown in FIG. 2, the probe is driven in the forward and backward directions with respect to the furnace body. The tip of the probe was moved in the circumferential direction with respect to the furnace body using a roll attached to the lower end of the advancing/retracting drive device, and inserted into an arbitrary position near the raceway. In this example, the angle θ is
The maximum angle was 15°. The maximum tilting angle in the vertical direction is the same as the maximum horizontal tilting angle θ, however, the tilting angle θ can be increased by modifying the Kirikasu 20 and Doco and increasing the diameter.

The position of the tip of the probe inserted into the furnace can be determined using the following equation.

(1) When tilting only in the horizontal direction with respect to the tuyere level axis X ₁ = Lcos θ ₁ , Y ₁ = Lsin θ ₁ (2) When tilting only in the vertical direction with respect to the tuyere level axis X ₂ = Lcos θ ₂ , Y ₂ = Lsin θ ₂ (3) When the tuyere level axis is symmetrical and the tuyere level axis is moved both horizontally and vertically 1) Position on the vertical plane X ₃ = Lcos θ ₂ , Y ₃ = Lsin θ _{2 2 ) Position on the horizontal plane} is the tilting angle (°) in the horizontal plane, and θ ₂ is the tilting angle (°) in the vertical plane.

The length L of the probe inserted into the furnace is Kirikasu 20
Distance to the rear end of the probe with the tip as the zero point reference
It can be determined from L ₁ and the total probe length L ₀ by L=L ₀ -L ₁ . In addition, the horizontal and vertical probe tilt angles are calculated using the known total angle.
It is provided in section 21 and can be determined using electrical signals.

Figure 5 shows an example of the results of temperature measurement and gas and melt sampling by inserting a probe into any position in and around the adjacent tuyere raceway from any tuyere where air blowing has stopped as described above. .

With conventional technology, data could only be collected at the tuyere level in the raceway and only in the radial direction of the furnace. Therefore, in the prior art, phenomena such as reactions within and in the vicinity of the raceway, amount of melt, and flow have been elucidated using one-level data. The accuracy was too lacking to elucidate the phenomenon mechanism of the entire raceway neighborhood using one-level data.

Figure 5 shows the temperature vertically downward at a position 1000 mm from the tip of the raceway tuyere, the melt dripping speed,
This shows the distribution of CO and CO ₂ . The arrows indicate the positions of the raceway walls.

With the device of the present invention, data such as temperature, gas composition, amount of melt, pressure, etc. can be collected from two sources as shown in Figure 5, and phenomena in and around the raceway can be accurately detected. I am now able to grasp this.

The present invention can clarify phenomena in the vicinity of the raceway, and brings about a great effect that contributes to blast furnace operation technology.

[Brief explanation of drawings]

Figures 1 and 2 are a side view and a plan view of an embodiment of the apparatus of the present invention, Figure 3 is an explanatory diagram for explaining the method of charging the apparatus of the present invention into a blast furnace, and Figure 4 is a conventional FIG. 5 is a longitudinal cross-sectional view of the vicinity of the tuyere showing the probe of the present invention, and FIG. 1...Probe, 2...Seal pipe, 3...
Gas on/off valve, 4... Gas seal device, 5 (5a,
5b), 9 (9a, 9b, 9c, 9d), 15, 1
7...Hydraulic cylinder, 6 (6a, 6b)...Cylinder rod, 7...Chickstand, 8, 8a...Frame, 10...Roll, 11...Free tilting device, 12...Guide groove, 13... Universal joint, 14,
16, 18...Connection rod, 19...Advance/retreat drive device,
20... Kirikasu, 21... Kirikasu Doko, 2
7...Blind flange.

Claims (1)

[Scope of Claims] 1. A hemispherical tip contacts the tuyere of a vertical furnace to close the gap between the tuyere and the probe, and a seal pipe that can freely swing around the hemispherical tip. , a probe that can be inserted into the seal pipe and into the furnace from the tuyere; a forward and backward drive device that moves the probe forward and backward; and a connection between the forward and backward drive device and the hemispherical surface at the tip of the seal pipe and the tuyere. 1. An apparatus for investigating the inside of a vertical furnace, characterized by comprising a free tilting device that tilts the vertical and horizontal directions around the central part.