JPS604243B2 - Lance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lance for melting and removing ingots attached to the furnace mouth by splash during refining in a metal refining furnace such as a converter.

The ingots that adhere and solidify at the furnace mouth during converter operation block the furnace □, making it difficult to continue the converter operation, and also reducing the refining capacity of the converter.

Conventionally, in order to remove this metal, workers moved the converter so that the axis of the furnace was almost horizontal and injected oxygen toward the furnace mouth to perform ablation. There is. Alternatively, a crane is used to slam a steel rod into the converter with the furnace axis horizontal, and the metal is dropped and removed. These methods require a large amount of time to remove the metal, making it difficult to operate the converter smoothly, and require workers to work in harsh environments with high temperatures where the metal is scattered. It is dangerous because of this. Another prior art of the present invention is constructed by detachably attaching a cover to the lower end of the refining lance, which has a metal melt-cutting nozzle that opens radially outward and approximately horizontally. In such prior art, no consideration is given to water-cooling the cover, and therefore the cover is melted due to the heat load during metal melting, and the life of the cover is very short, making it practically unusable. . In addition, since the cover must be attached and detached by a worker, it is inefficient and
It is also dangerous to work at heights under adverse conditions. To make matters worse, in this prior art, the oxygen jet injected from the downwardly opened refining nozzle of the refining lance
Since the oxygen is directed almost horizontally by the cover and is injected from the radially closed metal melting nozzle formed on the cover, the energy loss of oxygen is large.
It is difficult to perform high-velocity injection for cutting bare metal. Therefore, the main object of the present invention is to provide a safe, efficient, and durable lance for melting bare metal adhering to the furnace square of a metal refining furnace such as a converter. The present invention includes a lance body 2 having a vertical axis and vertically raised and lowered by a lifting means, and a nozzle tip 3 fixed to the lower end of the lance body 2 in a replaceable manner. , concentrically from the inside to the outside: an oxygen inner tube 7, an oxygen outer tube 1
0, the water inner pipe 16 and the water outer pipe 17 are arranged in a quadruple straight pipe shape, and the nozzle chip 3 has a plurality of refining nozzles 5 which are opened downward at equal intervals on the same circumference. A plurality of bullion melting nozzles 6 are formed around the outer periphery of this refining nozzle 5 and are opened at equal intervals on the same circumference. A bowl-shaped nozzle tip formed downward at an angle 3 in the range of 45 degrees and at a constant angle Q with respect to the radial direction of the lance, and fixed 37 to the oxygen inner tube 7 by welding at the nozzle tip 3. At the bottom of the oxygen inner pipe 30, a refining nozzle 5 is installed.
A bowl-shaped nozzle tip is closed and fixed by welding 38 to the outer oxygen tube 1. A nozzle 6 for melting metal is opened at the bottom of the outer oxygen tube 31, and a nozzle 6 for cutting the metal is opened at the lower end of the inner water tube 16. A bowl-shaped nozzle tip water tube 34 formed in the nozzle tip 3 which protrudes and is fixed to the connecting ring 33 is fitted with a plurality of circular arc-shaped tubes closed toward the axis of the lance 1 at the bottom thereof. The refining nozzle 5 and the bullion cutting nozzle 6 form the nozzle tip water pipe 3.
4 and opens into a bowl-shaped nozzle tip water pipe 36 on the outermost periphery, and the bowl-shaped water pipe 36 is fixed 39 to the water pipe 17 of the lance body 2 at its upper end by welding. , the welding position 37 between the oxygen inner tube 7 and the nozzle tip oxygen inner tube 30 is located above the welding position 38 between the oxygen outer tube 10 and the nozzle tip oxygen outer tube 31, The welding position 38 with the pipe 31, the iron joint and straightness between the connecting ring 33 and the nozzle tip water inner pipe 34, and the welding position 39 between the water outer pipe 17 and the nozzle tip water outer pipe 36 are as follows:
At almost the same height position, the water inner pipe 16 and the water outer pipe 17 are integrally constructed in the upper part of the lance body 2, and the oxygen inner pipe 7 and the oxygen outer pipe 10 are separated from each other by a packing 28. Displacement in the axial direction is allowed; Oxygen for metal melting is supplied between the outer circumference of the oxygen inner tube 7 and the inner circumference of the oxygen outer tube 10 via the control valve 12, and between the outer circumference of the oxygen outer tube 10 and the inner circumference of the water inner tube 16. This lance is characterized in that drained water is allowed to flow between the outer periphery of the inner water pipe 16 and the inner periphery of the outer water pipe 17.

FIG. 1 is an overall system diagram of one embodiment of the present invention, and FIG.
The figure is its bottom view. The lance according to the present invention basically consists of a lance body 2 and a nozzle tip 3 fixed to the lower end of the lance body 2 in a replaceable manner. The axis of the lance is along the vertical direction, and the lance is connected to a conventional lifting means by a mounting bracket 4, and is lifted and lowered in the vertical direction.
The nozzle chip 3 includes a plurality of refining nozzles 5 (three in the figure) that are closed downward at equal intervals on the same circumference, and a plurality of refining nozzles 5 around the refining nozzles 5 that are equally spaced in the circumferential direction on the same circumference. A plurality (eight in the figure) of metal fusing nozzles 6 provided at intervals are formed. The metal melt-cutting nozzle 6 has an attachment angle 8 (see FIG. 4) with respect to the horizontal plane. 8 is closed radially at an arbitrary angle within the range of 30 degrees upward to 45 degrees downward.

The refining nozzle 5 is connected to an oxygen supply source via an oxygen inner pipe 7, a steerable pipe 8, and a control valve 9. The metal melt-cutting nozzle 6 is connected to an oxygen supply source via an oxygen outer tube 10, a recessed tube 11, and a control valve 12. FIG. 4 is a longitudinal cross-sectional view of the vicinity of the nozzle tip 3, and FIGS. 5 and 6 are cross-sectional views taken along the section line V--V and the line of FIG. 4, respectively. Referring to these figures, the lance body 2 has an oxygen inner tube 7, an oxygen outer tube 10, and a water inner tube 16 arranged concentrically in order from the inside to the outside.
, the water pipes 17 are arranged in a quadruple straight pipe shape.
The oxygen inner pipe 7 forms a refining oxygen flow path 18 .
The outer circumference of the oxygen inner tube 7 and the inner circumference of the oxygen outer tube 10 define an oxygen flow path 19 for melting metal. The cooling water supply path 2 formed between the oxygen outer pipe 10 and the water inner pipe 16 includes a cooling water inlet pipe 21 (see FIG. 1), a flexible pipe 22, and a control valve 2.
3 to the cooling water supply source. Cooling water is discharged from a cooling water return path 24 between the water inner pipe 16 and the water outer pipe 17 via a cooling water outlet pipe 25, a mirror tube 26, and a control valve 27. As shown in FIG. 3, the water inner pipe 16 and the water outer pipe 17 are integrally constructed.

Oxygen inner and outer tubes 7, 1, gasket 26 at their upper ends
, 29, for the water inner pipe 16 and the water outer pipe 17,
Mutual displacement in the mariline direction is allowed. In the nozzle chip 3, a refining nozzle 5 is closed at the bottom of a bowl-shaped oxygen inner tube 30 that is fixed to the oxygen inner tube 7.

A metal melt cutting nozzle 6 is opened at the bottom of a bowl-shaped oxygen outer tube 31 fixed to the oxygen outer tube 10. A connecting ring 33 is fixed to the lower end of the water pipe 16 and protrudes downward. The bowl-shaped water pipe 34 of the nozzle tip 3 that is iron-fitted with the connecting ring 33 forms three arc-shaped folded water channels 35 that open toward the marlin of the lance 1 at its bottom. The refining nozzle 5 and the metal cutting nozzle 6 penetrate the bowl-shaped inner water pipe 34 and open into the outermost bowl-shaped water pipe 36 . This bowl-shaped outer water pipe 36 is fixed to the water outer pipe 17 at its upper end. When fixing the nozzle tip 3 to the lance body 2, the lower end of the oxygen inner tube 7 should be protruded below the water inner and outer tubes 16, 17 to connect with the bowl-shaped oxygen inner tube 30 of the nozzle tip 3 (see Fig. 4). ), and then weld the oxygen outer tube 10 and the bowl-shaped oxygen outer tube 31 at the connection point 38,
By pulling these oxygen inner and outer tubes 7 and 10 upward, the connecting ring 33 and the bowl-shaped water inner tube 34 are joined, and finally, the water outer tube 17 and the bowl-shaped outer water tube 36 are welded at the connection point 39. do.

During refining, the control valve 12 is connected to the metal melting nozzle 6.
Adjust the flow of oxygen to the extent that it will not be clogged or damaged by splash during refining, open the control valve 9 to supply oxygen to the refining oxygen passage 18, and inject oxygen from the refining nozzle 5. and perform Seikama.

After completing the refining and discharging the molten steel from the converter, the axis of the converter is set vertically, the nozzle tip 3 is placed near the inside of the furnace, the control valve 12 is opened, and the oxygen flow path 19 is opened. Oxygen is then injected from the metal melting nozzle 6 to melt the base metal attached to the furnace mouth. When melting the deposited metal in this furnace,
Control valve 9 is kept closed. The marking line of the metal welding nozzle 6 has a constant angle Q with respect to the radial direction of the lance 1.

Therefore, the oxygen jet from the metal melt cutting nozzle 6 is directed obliquely in all directions around the wall surface of the furnace □. Therefore, oxygen can be injected over a relatively wide range onto the wall surface of the furnace □, improving the efficiency of cutting the metal. As described above, according to the present invention, since the metal melting nozzle is formed at the lower end of the lance by passing through the oxygen flow path, the metal adhered to the furnace □ can be safely removed by remote control. This improves work efficiency and eliminates work in poor environments.

Since a flow path for a cooling medium such as water is formed around the entire outer circumference of the lance, melting loss is suppressed and durability is improved. In particular, in the present invention, the refining oxygen flow path, the metal melting oxygen flow path, and the two reciprocating flow paths for the cooling medium are formed in this order from radially inward to radially outward, and the refining oxygen flow path is The structure is as follows: is simplified.

Moreover, since the metal melt-cutting nozzle 6 is formed at an angle ranging from 30 degrees upward to 45 degrees downward with respect to the horizontal plane, the metal melting operation can be easily performed. Since the metal melting nozzle 6 has a constant angle Q with respect to the radial direction of the lance 1, oxygen can be injected over a wide range in the circumferential direction onto the wall surface of the furnace Improves efficiency.

In particular, in the present invention, in the upper part of the lance body 2, the oxygen inner and outer tubes 7,
Since the lower end of the water tube 16 can be inserted into and removed from the nozzle tip water tube 34, installation is easy and the nozzle tip 3 can be easily replaced.

The bowl-shaped nozzle tip water pipe 34 and the water pipe 16 of the lance body 2 are configured to be freely insertable and removable, so that it is safe even if water leaks into each other.

In order to reliably prevent oxygen and water from mixing, the oxygen outer tube 10 and the nozzle tip oxygen outer tube 31 are welded 38, and in order to reliably prevent water from leaking to the outside, a bowl-shaped The nozzle tip water outer pipe 36 and the water outer pipe 17 of the lance body 2 are welded at a position indicated by reference numeral 39 in FIG.

Therefore it is safe. In this manner, according to the present invention, mixing of oxygen or control gas with water is reliably prevented, and leakage of water to the outside is reliably prevented, thereby enabling safe operation.

In order to facilitate the exchange of the nozzle tip 3, the upper end of the bowl-shaped nozzle tip oxygen inner tube 30 is connected to other welding positions 38, 3.
9 and are welded above the mating position, cutting at the welding position 39 allows the nozzle tip 3 to protrude downward together with the oxygen tubes 7 and 10, and cutting at the welding position 38 is also possible. Easy and therefore easy to maintain.

[Brief explanation of the drawing]

Fig. 1 is an overall system diagram of an embodiment of the present invention, Fig. 2 is a bottom view of the lance 1 shown in Fig. 1, Fig. 3 is a vertical cross-sectional view of the upper portion of the lance 1, and Fig. 4 is a nozzle tip. 3, and FIGS. 5 and 6 are sectional views taken along section lines V--V and W- in FIG. 4, respectively. 1...Lance, 2...Lance body, 3
... Nozzle tip, 5 ... Refining nozzle, 6 ... Nozzle for cutting metal, 7 ... Oxygen inner pipe, 9
, 12... control valve, 10... oxygen outer pipe, 16... water inner pipe, 17... water outer pipe,
18...Oxygen flow path for refining, 19...Oxygen flow path for metal melt cutting, 20...Cooling water supply path,
24... Cooling water return path, 30... Bowl-shaped oxygen inner pipe, 31... Bowl-shaped oxygen outer pipe, 34... Bowl-shaped inner water pipe, 36... ...bowl-shaped water pipe. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. The lance body 2 has a vertical axis and is vertically raised and lowered by a lifting means, and a nozzle tip 3 is fixed to the lower end of the lance body 2 in a replaceable manner, and the lance body 2 is moved from the inside to the outside. An oxygen inner pipe 7, an oxygen outer pipe 10, a water inner pipe 16, and a water outer pipe 17 are arranged concentrically in order in a quadruple straight pipe shape. A plurality of refining nozzles 5 that are opened at intervals, and a plurality of bullion melting nozzles 6 that are opened at equal intervals on the same circumference are formed around the outer periphery of the refining nozzles 5. is formed at an angle β ranging from 30 degrees upward to 45 degrees downward with respect to the horizontal plane, and has a constant angle α with respect to the radial direction of the lance 1, and is welded to the oxygen inner tube 7 at the nozzle tip 3. A refining nozzle 5 opens at the bottom of the oxygen inner tube 30 and is fixed 38 to the oxygen outer tube 10 by welding.
A metal fusing nozzle 6 is opened at the bottom of the bowl-shaped oxygen outer tube 31, and a connecting ring 33 is fixed to the lower end of the water inner tube 16 so as to protrude downward.
A bowl-shaped nozzle tip water pipe 34 formed in the nozzle tip 3 that fits into the nozzle tip 3 forms a plurality of arc-shaped folded channels 35 that open toward the axis of the lance 1 at the bottom, and connects the refining nozzle 5 and the ground. The gold melt cutting nozzle 6 penetrates the nozzle tip water inner pipe 34 and opens into a bowl-shaped nozzle tip water outer pipe 36 at the outermost periphery. The oxygen inner tube 7 and the nozzle tip oxygen inner tube 30 are fixed to the outer tube 17 by welding 39, and the welding position 37 between the oxygen inner tube 7 and the nozzle tip oxygen outer tube 31 is located above the welding position 38 between the oxygen outer tube 10 and the nozzle tip oxygen outer tube 31. tube 10
and a welding position 38 between the nozzle tip oxygen outer tube 31 and a fitting position between the connecting ring 33 and the nozzle tip water inner tube 34,
Welding position 39 between the water outer pipe 17 and the nozzle tip water outer pipe 36
The inner water pipe 16 and the outer water pipe 17 are integrally constructed at the upper part of the lance body 2, and the oxygen inner pipe 7 and the oxygen outer pipe 10 are located at almost the same height position. The outer oxygen tube 10 is allowed to be displaced in the axial direction relative to the inner and outer water tubes 16 and 17 by the gasket 29, and the inner oxygen tube 7 is provided with controlled oxygen for refining. Oxygen for metal melting is supplied via the control valve 12 between the outer circumference of the oxygen inner tube 7 and the inner circumference of the oxygen outer tube 10, and between the outer circumference of the oxygen outer tube 10 and the inner circumference of the water inner tube 16. between the outer circumference of the water inner pipe 16 and the inner circumference of the water outer pipe 17,
A lance that is characterized by flowing cooling water.