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CN-224227102-U - Auxiliary sleeve suitable for large sleeve of blast-furnace air supply port

CN224227102UCN 224227102 UCN224227102 UCN 224227102UCN-224227102-U

Abstract

The utility model discloses an auxiliary sleeve suitable for a blast furnace air supply tuyere large sleeve, which relates to the technical field of blast furnace tuyeres, and comprises an auxiliary sleeve body and a plugging sleeve, wherein the plugging sleeve is sleeved on the periphery of the auxiliary sleeve body, the auxiliary sleeve body is used for being assembled into the tuyere large sleeve of a blast furnace and tightly pressing the plugging sleeve to be attached to the inner wall of the tuyere large sleeve, so that the plugging sleeve shields the damaged area of the tuyere large sleeve, through holes are formed in the auxiliary sleeve body and are used for supplying hot air and coal dust into the blast furnace, the auxiliary sleeve body is assembled into the tuyere large sleeve of the blast furnace and tightly pressing the plugging sleeve to be attached to the inner wall of the tuyere large sleeve, the damaged area of the tuyere large sleeve can be plugged by the plugging sleeve, the phenomenon that the inner wall of the tuyere large sleeve cracks and open welding causes coal gas to flow outwards can be effectively improved, the plugging effect is better on a coal gas leakage point, the coal gas leakage point is reduced, the smelting cost is reduced, and a relatively safe working environment is created.

Inventors

  • ZHANG LIANG
  • LIU GANG
  • CAI XUEBIN
  • YUE CAIDONG
  • ZHANG ZIHAN
  • LIU LIN
  • ZHANG DERONG
  • LIU HUIQIANG
  • TAN ZILIANG
  • YANG LINQUAN

Assignees

  • 攀钢集团攀枝花钢钒有限公司

Dates

Publication Date
20260512
Application Date
20250605

Claims (10)

  1. 1. The utility model provides an auxiliary sleeve of adaptation in big cover of blast furnace air supply wind gap, its characterized in that, including auxiliary sleeve body (1) and plugging sleeve (2), the periphery of auxiliary sleeve body (1) is located to plugging sleeve (2) cover, auxiliary sleeve body (1) be used for assembling to the big cover of blast furnace in, and with plugging sleeve (2) compress tightly to with the laminating of the inner wall of big cover of wind gap, make plugging sleeve (2) shelter the damage area of big cover of wind gap, through-hole (11) have been seted up to auxiliary sleeve body (1), through-hole (11) are used for supplying hot air and buggy entering inside the blast furnace.
  2. 2. The auxiliary sleeve for the large sleeve of the blast-furnace air supply port, which is adapted to claim 1, is characterized in that the auxiliary sleeve body (1) is of a hollow round platform structure, the auxiliary sleeve body (1) comprises a first end head (12) with a larger cross-sectional diameter and perpendicular to the axial direction of the through hole (11) and a second end head (13) with a smaller cross-sectional diameter and perpendicular to the axial direction of the through hole (11), the auxiliary sleeve body (1) further comprises a first limit structure (14) positioned at the periphery of the first end head (12), and the first limit structure (14) is propped against one end of the plugging sleeve (2) deviating from the second end head (13) so as to limit the plugging sleeve (2) from being separated from the auxiliary sleeve body (1) along the direction deviating from the second end head (13).
  3. 3. The auxiliary sleeve adapted to a blast furnace air supply tuyere large sleeve according to claim 2, wherein the auxiliary sleeve body (1) further comprises a second limiting structure (15) located at the periphery of the second end head (13), and the second limiting structure (15) is abutted against one end of the plugging sleeve (2) towards the second end head (13) so as to limit the plugging sleeve (2) to be separated from the auxiliary sleeve body (1) along the direction towards the second end head (13).
  4. 4. An auxiliary sleeve adapted to a blast furnace air supply tuyere large sleeve according to claim 3, wherein the first limiting structure (14) and the second limiting structure (15) are annular protrusions, the distance between the first limiting structure (14) and the outer peripheral surface of the auxiliary sleeve body (1) in the radial direction is equal to the distance between the second limiting structure (15) and the outer peripheral surface of the auxiliary sleeve body (1) in the radial direction, and the taper of the first limiting structure (14) and the taper of the second limiting structure (15) are the same as the taper of the tuyere large sleeve.
  5. 5. Auxiliary sleeve adapted to a blast furnace tuyere large sleeve according to any of the claims 1-4, characterized by the fact that the auxiliary sleeve body (1) is welded or screwed by means of bolts with the tuyere large sleeve, the auxiliary sleeve body (1) and the tuyere large sleeve being relatively fixed.
  6. 6. Auxiliary sleeve adapted to a blast furnace tuyere large sleeve according to any of the claims 1-4, characterized by the fact that the plugging sleeve (2) is in interference fit with the inner wall of the tuyere large sleeve.
  7. 7. Auxiliary sleeve adapted to a blast furnace tuyere large sleeve according to any of claims 1-4, characterized by the auxiliary sleeve body (1) being of unitary construction.
  8. 8. Auxiliary sleeve adapted to a blast furnace tuyere large sleeve according to any of claims 1-4, characterized in that the plugging sleeve (2) is an unshaped refractory.
  9. 9. The auxiliary sleeve adapted to the blast-furnace tuyere large sleeve according to claim 4, wherein an annular groove body (16) is formed between the first limiting structure (14) and the second limiting structure (15), a rope body wound on the periphery of the auxiliary sleeve body (1) and a material agent in contact with the rope body are arranged in the annular groove body (16), and the rope body and the material agent are used for forming the plugging sleeve (2) positioned in the annular groove body (16).
  10. 10. Auxiliary sleeve adapted to a blast furnace tuyere large sleeve according to any of the claims 1-4, characterized by the auxiliary sleeve body (1) being of metal material.

Description

Auxiliary sleeve suitable for large sleeve of blast-furnace air supply port Technical Field The utility model relates to the technical field of blast furnace tuyeres, in particular to an auxiliary sleeve which is suitable for a large sleeve of a blast furnace air supply tuyeres. Background Blast furnaces are the most important iron-making equipment in the modern steel industry that uses coke to reduce iron ore to produce pig iron. The blast furnace body is generally composed of a steel plate furnace shell and a refractory brick lining and is mainly divided into five parts from top to bottom, namely a furnace throat, a furnace body, a furnace waist, a furnace belly and a furnace hearth. In the blast furnace smelting process, the tuyere is a crucial component, and is the only passage for hot air (sometimes containing coal dust) to enter the blast furnace, and is a core link of a blast furnace air supply system. The service life of the tuyere is directly related to whether the blast furnace can stably run, the pig iron yield and quality and the labor intensity of workers. In order to improve the durability of the tuyere body, the technology of thermal spraying, spray welding and the like is commonly adopted in the industry to prepare a wear-resistant and high-temperature oxidation-resistant coating on the surface of the copper alloy. As one of the key bearing and connecting parts of the blast furnace air supply pipeline and the tuyere device, the tuyere large sleeve plays an indispensable role. The main functions of the blast furnace body include supporting the inner nested tuyere medium sleeve and the front-most tuyere small sleeve, firmly connecting, sealing and installing the whole tuyere device (comprising the medium sleeve, the small sleeve, the cooling water pipe and other accessory parts) on the blast furnace body. The big cover of wind gap is usually designed to hollow round platform shape structure, and the material is mostly cast iron or cast steel, and its inside casts has snakelike condenser tube, takes away the heat through continuous cooling water that lets in. The front end of the tuyere large sleeve is designed with a conical surface for being tightly matched with the conical surface at the upper end of the tuyere medium sleeve, and the upper end of the tuyere large sleeve is fixedly connected with a blast furnace body through a flange or a similar structure, so that the stability and the tightness of the whole tuyere device are ensured. However, after the blast furnace continuously runs for a long time, the blast furnace is subjected to various complicated and severe working conditions such as high temperature, high pressure, thermal stress circulation, gas flushing and the like, so that the inner wall of the tuyere large sleeve is cracked and welded, the gas is leaked, the blast furnace gas is leaked, serious trouble is brought to the blast furnace production, and the safety production of the blast furnace is influenced. Therefore, how to improve the phenomenon of gas channeling caused by cracking and welding of the inner wall of the tuyere large sleeve is a technical problem which needs to be solved by the skilled in the art at present. Disclosure of utility model The utility model aims to provide an auxiliary sleeve which is suitable for a blast furnace air supply tuyere large sleeve and can improve the phenomenon of gas channeling caused by cracking and open welding of the inner wall of the tuyere large sleeve. In order to achieve the above purpose, the utility model provides an auxiliary sleeve adapted to a blast furnace air supply tuyere large sleeve, which comprises an auxiliary sleeve body and a plugging sleeve, wherein the plugging sleeve is sleeved on the periphery of the auxiliary sleeve body, the auxiliary sleeve body is used for being assembled into the blast furnace tuyere large sleeve and tightly pressing the plugging sleeve to be attached to the inner wall of the tuyere large sleeve, so that the plugging sleeve shields a damaged area of the tuyere large sleeve, and the auxiliary sleeve body is provided with a through hole for supplying hot air and pulverized coal into the blast furnace. In one possible embodiment, the auxiliary sleeve body is in a hollow round platform structure, the auxiliary sleeve body comprises a first end with a larger cross section diameter perpendicular to the axial direction of the through hole and a second end with a smaller cross section diameter perpendicular to the axial direction of the through hole, the auxiliary sleeve body further comprises a first limiting structure positioned at the periphery of the first end, the first limiting structure is abutted against one end of the plugging sleeve, which is away from the second end, so that the plugging sleeve is limited to be separated from the auxiliary sleeve body along the direction away from the second end. In one possible embodiment, the auxiliary sleeve body further comprises a second limiting st