CN214088554U

CN214088554U - Oxygen lance nozzle water cooling device in converter waste heat boiler

Info

Publication number: CN214088554U
Application number: CN202022913451.8U
Authority: CN
Inventors: 卢春燕; 赵涛; 陈艳
Original assignee: Suzhou Hailu Heavy Industry Co Ltd
Current assignee: Suzhou Hailu Heavy Industry Co Ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-08-31
Anticipated expiration: 2030-12-08

Abstract

The utility model discloses an oxygen lance mouth water cooling plant in converter waste heat boiler is the contained angle setting between the upper segment of this oxygen lance mouth water cooling plant and fire door section flue, include: the top end of the shell is provided with an upper flange which can be connected with an oxygen lance port sealing device, a panel is sleeved on the outer side of the shell and welded on the lower side wall of the shell, and the panel can be fixed on a flue at a furnace port section; a plurality of U-shaped cold bending water pipes are uniformly embedded in the shell at intervals along the circumferential direction, and the cold bending water pipes are cast in the shell so as to be integrally cast and molded with the shell; the inlet end and the outlet end of each cold-bending water pipe are integrally bent and formed and then extend out of the shell, each inlet end is communicated with the annular water inlet header through the corresponding water inlet connecting pipe, the annular water inlet header is provided with a water inlet pipe capable of being communicated with a water source, each outlet end is communicated with the annular water outlet header through the corresponding water outlet connecting pipe, and the annular water outlet header is provided with a water outlet pipe. The device can bear high-temperature heat radiation, and the service life of the device is prolonged.

Description

Oxygen lance nozzle water cooling device in converter waste heat boiler

Technical Field

The utility model relates to a converter exhaust-heat boiler field, concretely relates to oxygen lance mouth water cooling plant wherein.

Background

The converter waste heat boiler is a flue type waste heat boiler and is widely applied to recovering heat in coal gas, high-temperature flue gas and smoke dust generated during converter steelmaking in a steel mill. The converter waste heat boiler is directly linked in the production process of converter steelmaking and directly participates in production as part of the steelmaking process of a steel mill. The converter waste heat boiler includes: the movable smoke hood, the furnace mouth section flue, the middle I section flue, the middle II section flue, the middle III section flue and the tail flue. An oxygen lance port is arranged on the side wall of a flue of the furnace mouth section right above the center of the furnace mouth, an oxygen lance port water cooling device is arranged on the flue of the furnace mouth section and is communicated with the oxygen lance port, and the oxygen lance port water cooling device is a device for adding oxygen in converter smelting and is a water cooling structural member. The top of the oxygen lance port water cooling device is provided with an oxygen lance port sealing device. Because the water cooling device at the oxygen lance opening is very close to the converter opening, the water cooling device is not only influenced by the heat radiation of the high-temperature molten steel in smelting above 1200 ℃, but also splashed matters such as slag liquid and the like are attached to the oxygen lance opening device, thereby forming a high-temperature triangular zone.

The components of the oxygen lance port water cooling device are generally connected by welding, and the welding connection mode is influenced by thermal radiation, and the welding stress changes frequently, so that the welding line stress is overlarge, and the cracking and the water leakage are easy to occur. The service life of the water cooling device at the oxygen lance port is about six months generally, and the time for replacing the water cooling device at the oxygen lance port is about 10 hours, so that the product quality and the production rhythm are influenced, the labor intensity for maintaining and replacing is high, and the major potential safety hazard exists, and becomes one of the main problems restricting the production efficiency of the converter.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: provides a water cooling device with an oxygen lance hole in a converter waste heat boiler, which has longer service life.

In order to achieve the above object, the utility model adopts the following technical scheme: oxygen lance hole water cooling plant in the converter waste heat boiler, this oxygen lance hole water cooling plant and the upper segment of furnace mouth section flue between be the contained angle setting, its characterized in that: the method comprises the following steps: the top end of the shell is provided with an upper flange which can be connected with an oxygen lance port sealing device, a panel is sleeved on the outer side of the shell and welded on the lower side wall of the shell, and the panel can be fixed on a flue at a furnace port section; a plurality of U-shaped cold bending water pipes are uniformly embedded in the shell at intervals along the circumferential direction, and the cold bending water pipes are cast in the shell so as to be integrally cast and molded with the shell; the inlet end and the outlet end of each cold-bending water pipe are integrally bent and formed and then extend out of the shell, each inlet end is communicated with the annular water inlet header through the corresponding water inlet connecting pipe, the annular water inlet header is provided with a water inlet pipe capable of being communicated with a water source, each outlet end is communicated with the annular water outlet header through the corresponding water outlet connecting pipe, and the annular water outlet header is provided with a water outlet pipe.

Further, the oxygen lance port water cooling device in the converter waste heat boiler comprises: each U-shaped cold bending water pipe is formed by bending a whole seamless steel pipe.

Further, the oxygen lance port water cooling device in the converter waste heat boiler comprises: the roundness of the bent pipe at the bottom of each U-shaped cold bending water pipe is less than or equal to 12 percent, and the thinning amount is less than or equal to 15 percent.

Further, the oxygen lance port water cooling device in the converter waste heat boiler comprises: the inlet end of the water inlet pipe is provided with a filter, and cooling water enters the water inlet pipe after being filtered by the filter.

Further, the oxygen lance port water cooling device in the converter waste heat boiler comprises: the included angle between the shell and the upper section of the flue of the furnace mouth section ranges from 35 degrees to 40 degrees.

Further, the oxygen lance port water cooling device in the converter waste heat boiler comprises: the bottom of each clod wash water pipe all is located the below of panel.

The utility model has the advantages that: one thereby the clod wash water pipe of "U" shape is cast in the casing and the whole cast moulding structure of casing makes between clod wash water pipe and the casing not have the welding seam, can bear high temperature heat radiation, and the clod wash water pipe is difficult for leaking to the life of oxygen rifle mouth water cooling plant has been prolonged. Secondly, the utility model discloses further advantage is: each U-shaped cold-bending water pipe is formed by bending a whole seamless steel pipe, after forming, the roundness of the bent pipe at the bottom of the cold-bending water pipe is less than or equal to 12%, and the thinning amount is less than or equal to 15%, the structure can ensure that cooling water has certain flow, the cooling effect is met, and the service life of the cold-bending water pipe is prolonged.

Drawings

FIG. 1 is a schematic structural view of an oxygen lance port water cooling device in a converter waste heat boiler according to the present invention;

FIG. 2 is a schematic structural view of an oxygen lance port water cooling device and a furnace port section flue;

FIG. 3 is a schematic structural view taken at a section B-B in FIG. 1;

FIG. 4 is a schematic structural view of a section C-C in FIG. 1.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the oxygen lance port water cooling device in the converter waste heat boiler, the oxygen lance port water cooling device 100 and the upper section 111 of the furnace port section flue are arranged in an included angle, and the oxygen lance port water cooling device comprises: a shell 2 with openings at two ends, an upper flange 1 which can be connected with an oxygen lance port sealing device is arranged at the top end of the shell 2, a panel 6 is sleeved at the outer side of the shell 2 and welded on the lower side wall of the shell 2, and the panel 6 can be fixed on a flue at a furnace port section; a plurality of U-shaped cold-bending water pipes 5 are uniformly embedded in the shell 2 at intervals along the circumferential direction, and the U-shaped cold-bending water pipes 5 are cast in the shell so as to be integrally cast with the shell 2; the inlet end 511 and the outlet end 512 of each cold-bending water pipe 5 are integrally bent and formed and then extend out of the shell 2, each water inlet end 511 is communicated with the annular water inlet header 4 through the corresponding water inlet connecting pipe 51, a water inlet pipe 7 capable of being communicated with a water source is arranged on the annular water inlet header 4, each water outlet end 512 is communicated with the annular water outlet header 3 through the corresponding water outlet connecting pipe 52, and a water outlet pipe 8 is arranged on the annular water outlet header 3. The U-shaped cold-bending water pipe 5 is cast in the shell 2, so that the cold-bending water pipe 5 and the shell 2 are integrally cast and formed, no welding line exists between the cold-bending water pipe 5 and the shell 2, high-temperature heat radiation can be borne, the cold-bending water pipe 5 is not prone to water leakage, and the service life of the oxygen lance port water cooling device is prolonged.

In the embodiment, 9U-shaped cold-bending water pipes 5 are arranged, each U-shaped cold-bending water pipe 5 is formed by bending a whole seamless steel pipe, and after forming, the roundness of the bent pipe at the bottom of the cold-bending water pipe 5 is less than or equal to 12%, and the thinning amount is less than or equal to 15%. Each cold-bending water pipe 5 is bent by using a whole seamless steel pipe, has no welding joint, has small influence of high-temperature radiation, and is not easy to crack and leak water. The roundness of the bottom elbow of the cold-bending water pipe 5 and the technical requirements of the thinning amount can ensure that the cooling water has certain flow, the cooling effect is met, and the cold-bending water pipe 5 can be prevented from being melted and penetrated due to overlarge wall thickness thinning at the bottom elbow of the cold-bending water pipe 5.

In this embodiment, the shell 2 is an iron casting, and when the cold-bending water pipes 5 and the shell 2 are integrally cast, the 9 cold-bending water pipes 5 are fixed by a special tool, embedded in a cavity of a mold, cast in a bottom-pouring manner, and integrally formed. In the process of iron liquid solidification, the shrinkage rate difference of the two materials is large, and internal stress is easily formed. For this reason, the castings should be subjected to stress-relief solution heat treatment to ensure the service life of the products. The upper flange 1, the panel 6 and the shell 2 are welded, and after welding, the whole body also needs solution treatment to eliminate welding stress.

In this embodiment, the inlet end of the water inlet pipe 7 is provided with a filter 9, and the cooling water is filtered by the filter 9 and then enters the water inlet pipe 7. The filter 9 is arranged to prevent impurities in the cooling water from precipitating after entering the cold bending water pipes 5, so that the flow rate of the cooling water is not influenced, the cooling effect of the oxygen lance port water cooling device in the converter waste heat boiler is not influenced, and the service life of the cold bending water pipes is not influenced.

In the embodiment, the bottom end of each cold bending water pipe 5 is positioned below the panel 6, so that the oxygen lance port water cooling device has no cooling dead angle. When the cooling device works, the welding position of the shell 2 and the panel 6 is also in an effective cooling range, and the welding position crack caused by frequent change of welding stress due to high-temperature radiation at the welding position of the shell 2 and the panel 6 is prevented.

As shown in fig. 2, in actual manufacturing, since the throat section 111 includes: a vertically arranged lower section and an obliquely arranged upper section. In order to ensure the oxidation effect of the converter, the oxygen lance opening needs to be positioned right above the center of the furnace opening, so that the oxygen lance opening is arranged on the upper section of the furnace opening section flue 111, and the oxygen lance opening water cooling device 100 needs to form an included angle with the upper section of the furnace opening section flue so as to ensure that oxygen vertically passes through the lower section of the furnace opening section flue and then is introduced into the converter. Therefore, the angle between the shell 2 and the upper section of the fire hole section flue 111 is set to be 35-40 degrees.

The flow of the cooling water of the utility model is as follows: the cooling water flows into the annular water inlet header 4 from the water inlet pipe 7 after being filtered by the filter 9, enters the corresponding cold bending water pipe 5 from each water inlet connecting pipe 51, then enters the annular water outlet header 3 from the corresponding water outlet connecting pipe 52, and finally flows out from the water outlet pipe 8.

After the oxygen lance port water cooling device in the converter waste heat boiler is used, the service life of the oxygen lance port water cooling device formed by welding and connecting the main components is more than two times, and at least 12 months can be reached.

The utility model has the advantages that: one thereby the clod wash water pipe 5 of "U" shape is cast in casing 2 and the whole cast moulding structure of casing 2 makes between clod wash water pipe 5 and the casing 2 not have the welding seam, can bear high temperature heat radiation, and clod wash water pipe 5 is difficult for leaking to the life of oxygen rifle mouth water cooling plant has been prolonged. Secondly, the utility model discloses further advantage is: each U-shaped cold-bending water pipe 5 is formed by bending a whole seamless steel pipe, after forming, the roundness of the bent pipe at the bottom of the cold-bending water pipe 5 is less than or equal to 12%, and the thinning amount is less than or equal to 15%, the above structure can ensure that cooling water has certain flow, the cooling effect is met, and the service life of the cold-bending water pipe 5 is also prolonged.

Claims

1. Oxygen lance hole water cooling plant in the converter waste heat boiler, this oxygen lance hole water cooling plant and the upper segment of furnace mouth section flue between be the contained angle setting, its characterized in that: the method comprises the following steps: the top end of the shell is provided with an upper flange which can be connected with an oxygen lance port sealing device, a panel is sleeved on the outer side of the shell and welded on the lower side wall of the shell, and the panel can be fixed on a flue at a furnace port section; a plurality of U-shaped cold bending water pipes are uniformly embedded in the shell at intervals along the circumferential direction, and the cold bending water pipes are cast in the shell so as to be integrally cast and molded with the shell; the inlet end and the outlet end of each cold-bending water pipe are integrally bent and formed and then extend out of the shell, each inlet end is communicated with the annular water inlet header through the corresponding water inlet connecting pipe, the annular water inlet header is provided with a water inlet pipe capable of being communicated with a water source, each outlet end is communicated with the annular water outlet header through the corresponding water outlet connecting pipe, and the annular water outlet header is provided with a water outlet pipe.

2. The oxygen lance port water cooling device in the converter waste heat boiler as claimed in claim 1, characterized in that: each U-shaped cold bending water pipe is formed by bending a whole seamless steel pipe.

3. The oxygen lance port water cooling device in the converter waste heat boiler as claimed in claim 2, characterized in that: the roundness of the bent pipe at the bottom of each U-shaped cold bending water pipe is less than or equal to 12 percent, and the thinning amount is less than or equal to 15 percent.

4. The lance port water cooling device in the converter waste heat boiler as claimed in claim 1, 2 or 3, characterized in that: the inlet end of the water inlet pipe is provided with a filter, and cooling water enters the water inlet pipe after being filtered by the filter.

5. The lance port water cooling device in the converter waste heat boiler as claimed in claim 1, 2 or 3, characterized in that: the included angle between the shell and the upper section of the flue of the furnace mouth section ranges from 35 degrees to 40 degrees.

6. The lance port water cooling device in the converter waste heat boiler as claimed in claim 1, 2 or 3, characterized in that: the bottom of each clod wash water pipe all is located the below of panel.