CN219099211U - Tuyere small sleeve - Google Patents

Abstract

The utility model relates to a tuyere small sleeve, which comprises: a jacket body including a first cooling water inlet, a first cooling water outlet, a second cooling water inlet, and a second cooling water outlet; an inner sleeve which is in butt joint with the first part of the sleeve main body and comprises a first cavity, wherein the first cavity is communicated with a first cooling water inlet and a first cooling water outlet; the outer sleeve is arranged outside the inner sleeve and is in butt joint with the second part of the sleeve main body, a second cavity is formed by the outer sleeve and the inner sleeve, and the second cavity is communicated with the second cooling water inlet and the second cooling water outlet; an inner deflector disposed in the first cavity and configured to guide the flow of cooling water in the first cavity; and an outer deflector disposed in the second cavity and configured to guide the flow of cooling water in the second cavity; the inner sleeve and the outer sleeve are in first welding connection, and a welding seam of the first welding connection is positioned on the inner wall of the small wind hole of the wind port sleeve. The cooling structure that this application wind gap cover includes two business turn over has improved cooling capacity, has increased life.

Description

Tuyere small sleeve

Technical Field

The utility model relates to the technical field of blast furnaces, in particular to a tuyere small sleeve.

Background

Blast furnace smelting is a process for continuously producing liquid products (e.g., pig iron) in a blast furnace using coke, raw materials (e.g., iron ore) and solvents (limestone, dolomite). In the production of a blast furnace, coke, raw materials and solvent are filled into the blast furnace from an inlet at the top of the blast furnace, preheated air is blown in from a tuyere at the lower part of the furnace along the periphery of the furnace or auxiliary fuel (coal dust, heavy oil and natural gas) is blown in, carbon in the coke or the auxiliary fuel can be combusted with oxygen in the blown air at high temperature to generate carbon monoxide and hydrogen, and oxygen in the raw materials can be removed in the ascending process of the blast furnace, so that a liquid product can be obtained.

The blast furnace tuyere small sleeve is an important part for blowing or spraying auxiliary fuel into the furnace in the production of the blast furnace, and is also the part which is most easily damaged. The front end of the tuyere small sleeve needs to extend into the furnace, is easily melted and damaged by high temperature (2000-2400 ℃) in the furnace, is easily worn by drop penetration of metal liquid drops and circulation of coke, and the inner wall of the tuyere is extremely easily eroded by auxiliary fuel during air supply, so that the working environment of the blast furnace tuyere small sleeve is extremely severe, and the tuyere small sleeve needs to be cooled and radiated continuously. When the tuyere small sleeve is damaged and needs to be replaced, the blast furnace needs to be stopped from blowing down, and the unordered damage replacement of the small sleeve can generate great harm to the stable operation of the blast furnace. At present, the blast furnace is provided with a small tuyere sleeve with single water inlet and outlet, only one cooling channel is arranged in the small tuyere sleeve, when the cooling channel is damaged, the small tuyere sleeve needs to be replaced, the blast furnace needs to stop production after damping down, and the service life is short. Therefore, there is a strong need in the art for a tuyere small sleeve that can extend the service life to extend the blast furnace damping interval.

Disclosure of Invention

Aiming at the technical problems in the prior art, the utility model provides an air port small sleeve, which comprises: a jacket body including a first cooling water inlet, a first cooling water outlet, a second cooling water inlet, and a second cooling water outlet; an inner sleeve in butt joint with a first part of the sleeve main body, wherein the inner sleeve comprises a first cavity which is communicated with the first cooling water inlet and the first cooling water outlet; the outer sleeve is arranged outside the inner sleeve and is in butt joint with the second part of the sleeve main body, a second cavity is formed between the outer sleeve and the inner sleeve, and the second cavity is communicated with the second cooling water inlet and the second cooling water outlet; an inner deflector disposed in the first cavity and configured to guide cooling water to flow in the first cavity; and an outer deflector disposed in the second cavity and configured to guide cooling water to flow in the second cavity; the inner sleeve and the outer sleeve are in first welding connection, and a welding seam of the first welding connection is positioned on the inner wall of the small wind hole of the wind port.

The tuyere small sleeve comprises an inner wall, an outer wall and a bending part between the inner wall and the outer wall, wherein the inner wall and the outer wall are integrally formed, and the inner sleeve is connected to the first part of the sleeve main body through the free end of the inner wall and the free end of the outer wall.

As described above, the tuyere small sleeve, the outer sleeve includes a side wall and a front wall integrally formed therewith, the outer sleeve is connected to the second portion of the sleeve body through a free end of the side wall, and the outer sleeve is connected to the inner sleeve through a free end of the front wall.

A tuyere small sleeve as described above, the front wall of the outer sleeve defining a front end portion of the wind hole; the inner wall of the inner sleeve defines a middle portion of the wind hole; the sleeve body defines a rear end portion of the wind hole.

As for the tuyere small sleeve, the inner wall of the inner sleeve is connected with the sleeve main body in a second welding mode, and a welding seam of the second welding mode faces the wind hole.

As described above, the connection between the outer wall of the inner sleeve and the sleeve main body is a third welded connection, and the welded seam of the third welded connection is located in the second cavity.

As for the tuyere small sleeve, the connection between the side wall of the outer sleeve and the sleeve main body is fourth welding connection, and the welding seam of the fourth welding connection is far away from the welding seam of the third welding.

The tuyere small sleeve comprises a sleeve main body, wherein the sleeve main body comprises a first water inlet chamber, a first water outlet chamber, a second water inlet chamber and a second water outlet chamber, the first water inlet chamber is communicated with the first cooling water inlet, the first water outlet chamber is communicated with the first cooling water outlet, the second water inlet chamber is communicated with the second cooling water inlet, and the second water outlet chamber is communicated with the second cooling water outlet.

A tuyere small sleeve as described above, wherein the sleeve body comprises an additional water channel, which is adjacent to the second portion of the sleeve body.

The tuyere small sleeve is characterized in that the additional water channel is communicated with the first water inlet chamber or the first water outlet chamber.

This application wind gap cover is inside to include two independent cavitys, forms the cooling structure of two business turn over for the cover has more good cooling capacity when using, even a cooling structure inefficacy moreover, another cooling structure sustainable use, great increase the life of wind gap cover.

Drawings

Preferred embodiments of the present utility model will be described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic view of a tuyere small sleeve according to an embodiment of the present application;

FIG. 2 is an exploded view of a tuyere small sleeve according to an embodiment of the present application;

FIG. 3 is a side view of a tuyere small sleeve according to an embodiment of the present application;

FIG. 4 is a cross-sectional view taken in the direction of FIG. 3 A-A;

FIG. 5 is an end view of a tuyere small sleeve according to an embodiment of the present application;

FIG. 6 is a cross-sectional view taken in the direction of FIG. 5B-B;

FIG. 7 is a cross-sectional view taken along the direction of FIG. 5C-C;

FIG. 8 is a schematic view of an inner deflector water flow in accordance with one embodiment of the present application;

FIG. 9 is a schematic illustration of the flow of external flow directors according to one embodiment of the present application; and

fig. 10 is a schematic view of an outer deflector flow according to another embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the application may be practiced. In the drawings, like reference numerals describe substantially similar components throughout the different views. Various specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to practice the teachings of the present application. It is to be understood that other embodiments may be utilized or structural, logical, or electrical changes may be made to the embodiments of the present application.

At present, most manufacturers are researching a small tuyere sleeve with double inlet and outlet cooling water. Through the mode that has increased the circulating water all the way, increase the life of wind gap sleeve, can close this water route after a water route damages, continue to use another water route to can avoid once blast furnace to change the small sleeve of wind gap and stop down. However, at present, most manufacturers increase a circulating waterway and all realize through penetrating a water pipe structure in the tuyere small sleeve, the structure limits the water flow to the cavity, and the perforating pipe structure influences the throughput of another cooling runner, so that the whole radiating effect of the small sleeve is poor, the tuyere small sleeve main body needs casting molding, the structural strength is not high, the tuyere small sleeve is easily damaged by the drop penetration of metal drops, once the tuyere small sleeve is damaged, the high temperature in the furnace is easily directly leaked by the perforating pipe, the service life of the rear end of the small sleeve is reduced, the manufacturing process of the perforating pipe structure is complex, the welding bead is more, defects are easily generated, the hidden danger of damage is increased, the service life is influenced, and the existing requirements cannot be met.

The application provides a novel two wind gap cover that advance two air outlets, has cancelled water pipe structure, has eliminated the hidden danger. And the inner and outer weld beads connected in the tuyere small sleeve move backwards to be close to the outside of the blast furnace, so that the influence of a high temperature region of the blast furnace can be kept away from, the damage probability of the tuyere small sleeve is reduced, the flow of the two waterways can be adjusted at will according to requirements, and the requirements of customers are met.

The technical scheme of the application is further described through specific embodiments. It should be understood by those skilled in the art that the following descriptions are only for convenience in understanding the technical solutions of the present application and should not be used to limit the scope of protection of the present application.

FIG. 1 is a schematic view of a tuyere small sleeve according to an embodiment of the present application. Fig. 2 is an exploded view of a tuyere small sleeve according to an embodiment of the present application. FIG. 3 is a side view of a tuyere small sleeve according to an embodiment of the present application. Fig. 4 is a cross-sectional view taken along the direction of fig. 3 A-A. Fig. 5 is an end view of a tuyere small sleeve according to an embodiment of the present application. Fig. 6 is a cross-sectional view in the direction of fig. 5B-B. Fig. 7 is a cross-sectional view in the direction of fig. 5C-C.

As shown, the tuyere small sleeve 100 (may be simply referred to as a "small sleeve") includes a sleeve main body 110, an inner sleeve 120, an outer sleeve 130, an inner deflector 140, and an outer deflector 150. Wherein the jacket main body 110 may include a first cooling water inlet 111 and a first cooling water outlet 112, a second cooling water inlet 113 and a second cooling water outlet 114; the inner sleeve 120 interfaces with a first portion of the sleeve body 110, which includes a first cavity 121, the first cavity 121 may be in communication with the first cooling water inlet 111 and the first cooling water outlet 112; the outer jacket 130 is disposed at the outer side of the inner jacket 120 and is abutted with the second portion of the jacket main body 110, a second cavity 131 is formed between the outer jacket 130 and the inner jacket 120, and the second cavity 131 is communicated with the second cooling water inlet 113 and the second cooling water outlet 114; the inner deflector 140 is disposed in the first cavity 121, and can guide the cooling water to flow in the first cavity, so as to dissipate heat for the tuyere small sleeve; the outer deflector 150 is disposed in the second cavity 131, and can guide the cooling water to flow in the second cavity 131, so as to dissipate heat for the tuyere small sleeve.

In some embodiments, the tuyere small sleeve 100 may further include a wind hole 160 provided in the tuyere small sleeve, which may be used to blow or inject auxiliary fuel into the blast furnace. In some embodiments, the wind hole 160 extends through the entire tuyere small sleeve, wherein the outer sleeve defines a front end portion 161 of the wind hole; the inner sleeve defines a middle portion 162 of the wind hole; the sleeve body defines a rear end portion 163 of the wind hole. In some embodiments, the front end portion of the wind hole 160 may include a wear layer (not shown) that may effectively prevent the flushing of the wind hole into the auxiliary fuel and may resist high temperature erosion in the blast furnace. In some embodiments, the wind hole middle portion may also include a wear layer proximate the front end portion. In some embodiments, the wear layer may be formed by build-up welding. In some embodiments, the wear layer may be 2-5mm thick. For example: 3mm.

Referring to fig. 4, in some embodiments, the sleeve body 110 is generally circular in shape, wherein the first portion 101 of the sleeve body 110 is proximal to the intermediate portion of the sleeve body and the second portion 102 of the sleeve body is distal to the intermediate portion of the sleeve body as compared to the first portion 101. In some embodiments. The sleeve body 110 may further include a first water inlet chamber 115, a first water outlet chamber 116, a second water inlet chamber 117, and a second water outlet chamber 118, wherein the first water inlet chamber 115 communicates with the first cooling water inlet 111; the first water outlet chamber 116 is communicated with the first cooling water outlet 112, the second water inlet chamber 117 is communicated with the second cooling water inlet 113, and the second water outlet chamber 118 is communicated with the second cooling water outlet 114, and the cooling water inlet and outlet of the small air inlet and outlet sleeve can be buffered by arranging a plurality of chambers in the sleeve main body and communicating with the cooling water inlet and outlet. In some embodiments, the first water inlet chamber 115 and the first water outlet chamber 116 completely cover the entire sleeve body 110, so that the cooling water can occupy the entire sleeve body and protect the sleeve body from heat dissipation. In some embodiments, the volume occupied by the first outlet chamber 116 is greater than the volume occupied by the first inlet chamber 115. In some embodiments, the material of the sleeve body may be copper, which facilitates heat transfer and heat dissipation from the tuyere small sleeve. In some embodiments, the sleeve body may be formed by casting, facilitating the formation of multiple chambers, facilitating manufacturing.

In some embodiments, the sleeve body 110 may further include an additional waterway 119 disposed proximate to the second portion of the sleeve body. In some embodiments, the additional waterway 119 is in communication with the first outlet chamber 116, such that cooling water may enter the sleeve body proximate the second portion from the additional waterway, and may thermally protect the sleeve body. Referring to fig. 6, in some embodiments, the additional waterway 119 has a bar shape in cross section, extends along the wind hole of the tuyere small sleeve and surrounds the outside of a portion of the second water inlet chamber 117 and the second water outlet chamber 118, and may protect the sleeve body at the second water inlet chamber 117 and the second water outlet chamber 118, for example: when the jacket is damaged, the cooling water in the second chamber 131 fails to be closed, and the additional water channel 119 can prevent the damage and leakage of the jacket main body at the second water inlet chamber 117 and the second water outlet chamber 118 caused by the environment in the furnace, so that the casualties or property loss are avoided. In some embodiments, additional waterways 119 may also be provided around the outside of all of the second inlet chamber 117 and the second outlet chamber 118, which may effectively protect the sleeve body at the second inlet chamber 117 and the second outlet chamber 118. In some embodiments, an additional waterway may also be in communication with the first water inlet chamber, thereby providing more effective protection to the sleeve body.

In some embodiments, the inner sleeve 120 may include an inner wall 122, an outer wall 123, and a bend 124 therebetween. Wherein, the inner wall 122, the outer wall 123 and the bending portion 124 are integrally formed, and the inner sleeve 120 is connected to the first portion of the sleeve body through the free end of the inner wall 122 and the free end of the outer wall 123. In some embodiments, the material of the inner sleeve may be copper, which facilitates heat transfer and heat dissipation from the tuyere small sleeve. In some embodiments, the inner sleeve can be formed by extrusion, so that the compactness of the outer sleeve can be improved, the strength of the outer sleeve can be increased, and the severe environment in the furnace can be better resisted.

In some embodiments, the free end of the inner wall 122 and the sleeve body 110 may be connected by welding, and the weld seam of the two faces the wind hole 160 and is located on the inner wall of the wind hole, so that the welding channel can be protected from the high temperature in the furnace, thereby damaging the structure of the tuyere small sleeve. In some embodiments, the free end of the outer wall 123 and the sleeve main body 110 may also be connected by welding, and the welding seam between the two is located in the second cavity 131, so that damage to the outer environment can be effectively avoided, and the stability of the tuyere small sleeve structure is ensured.

In some embodiments, jacket 130 may include side walls 132 and front wall 133, wherein both side walls 132 and front wall 133 are integrally formed. The outer sleeve 130 is connected to the second portion of the sleeve body 110 by the free ends of the side walls 132, and the outer sleeve 130 is connected to the inner sleeve 120 by the free ends of the front wall 133. In some embodiments, the material of the outer sleeve may be copper, which facilitates heat transfer and heat dissipation from the tuyere small sleeve. In some embodiments, the outer sleeve can be formed by extrusion, so that the compactness of the outer sleeve can be improved, the strength of the outer sleeve is increased, and the severe environment in the furnace is better resisted.

In some embodiments, the free end of the side wall 132 and the sleeve main body 110 may be connected by welding, and a welding seam between the free end of the outer wall 123 and the sleeve main body 110 may be far away from a welding seam between the free end of the outer wall 123 and the sleeve main body, so that an influence of high temperature in the furnace on the welding seam may be effectively prevented, and damage to the welding seam caused by metal liquid drops in the furnace may be prevented, and stability of the tuyere small sleeve structure may be also prevented. In some embodiments, the free end of the front wall 133 and the inner sleeve 120 may be connected by welding, and the welding seam therebetween is located on the inner wall of the wind hole, so that the influence of the metal liquid drop dropped in the furnace on the welding seam, the influence of the coke circulation in the furnace on the welding seam, and the influence of the high temperature in the furnace on the welding seam are prevented, the welding seam is effectively protected, and the stability of the tuyere small sleeve structure is facilitated. In some embodiments, the weld between the free end of the front wall 133 and the inner sleeve 120 may be disposed in the wind hole wear layer, such that the wear layer may protect the weld from the injected auxiliary fuel.

In some embodiments, the side wall 132 of the outer sleeve is located outside the outer wall 123 of the inner sleeve, and the front wall 133 of the outer sleeve surrounds the front end of the bent portion 124 of the inner sleeve, so that the outer sleeve can protect the inner sleeve. In some embodiments, the thickness of the sidewall 132 is 10-15mm, which is effective to prevent the sides of the tuyere small sleeve from being penetrated by or melted by the metal liquid. According to a preferred embodiment of the present application, the thickness of the sidewall 132 may be 13mm. In some embodiments, the thickness of the front wall 133 is 25-30mm, which can effectively prevent mechanical abrasion and thermal melting loss of the front end of the tuyere small sleeve, and increase the service life of the tuyere small sleeve. According to a preferred embodiment of the present application, the thickness of the front wall 133 may be 28mm.

In some embodiments, the inner deflector 140 includes a front bulkhead 141 located proximate the bend of the inner sleeve, an intermediate bulkhead 142 between the front bulkhead and the first portion of the sleeve body, and a plurality of water baffles 143 between the intermediate bulkhead and the outer wall of the inner sleeve. In some embodiments, the material of the inner deflector may be steel, which may provide support to the tuyere small sleeve internally, which is advantageous for improving the strength of the tuyere small sleeve. In some embodiments, the inner deflector may be welded to facilitate fabrication.

Referring to fig. 8, fig. 8 is a schematic view of an inner deflector water flow in accordance with one embodiment of the present application. In some embodiments, the internal flow director may divide the first chamber into multiple sections (front chamber 1211, inlet chamber 1212, and outlet chamber 1213), with the cooling water entering the first chamber entering the inlet chamber 1212, then entering the front chamber 1211 from the inlet chamber 1212, then entering the outlet chamber 1213, and finally exiting the first chamber from the outlet chamber 1213.

In some embodiments, a plurality of water blocking plates 143 are provided in the outlet chamber 1213, and a flow passage may be formed in the outlet chamber 1213 to guide the flow of cooling water. In some embodiments, portions of the intermediate partition are bent outwardly adjacent the first portion of the sleeve body so as to be in communication with the water inlet and/or outlet of the sleeve body, which may allow cooling water to enter the water inlet chamber 1212 and/or exit the water outlet chamber 1213. In some embodiments, the plurality of water stop plates 143 are arranged more sparsely closer to the sleeve body, so that the formed flow passage cross-sectional area is larger, and the flow velocity of the flow passage water flowing from the sleeve body is faster, so that the split small sleeve is beneficial to extending into the blast furnace part to dissipate heat. In some embodiments, the cross-sectional area of the front chamber 1211 is the smallest, and the flow rate of water in the front chamber is the fastest, resulting in the best heat dissipation.

In some embodiments, the inner deflector 140 may further include a water baffle 144 disposed on the front partition 141 and extending toward the front chamber 1211, which may block the cooling water entering the front chamber 1211, so that the cooling water flows along the entire front chamber and then enters the outlet chamber, preventing the water from flowing back into the outlet chamber after entering the front chamber, resulting in the front chamber forming a dead water zone, which affects the heat dissipation of the tuyere small sleeve.

In some embodiments, the second cavity 131 may include a side chamber 1311 and a front chamber 1312, with the external deflector 150 positioned in the side chamber 1311, which may direct the flow of water into the front chamber 1312 or the cooling water exiting the front chamber 1312. In some embodiments, the cross-sectional area of the front end chamber 1312 may be the same as the cross-sectional area of the inner sleeve front chamber 1211, so that the cooling water in the front end chamber 1312 may have the fastest flow rate, and the best heat dissipation effect is beneficial to the tuyere small sleeve to resist the severe environment in the furnace.

Referring to fig. 9, fig. 9 is a schematic view of an outer deflector water flow in accordance with one embodiment of the present application. In some embodiments, the outer deflector 150 includes a plurality of water-stop plates 151 between the outer wall of the inner case and the side wall of the outer case, and has a simple structure, is easy to manufacture, and easily ensures heat dissipation performance. In some embodiments, a plurality of water stop plates 151 may be welded to the outer wall of the inner case to form a flow passage for cooling water. In some embodiments, the water trap 151 may also divide the second cavity into a front end cavity and a side cavity. In some embodiments, the water stop 151 may be made of copper, which is beneficial to welding the water stop to the outer wall of the inner sleeve, and is also beneficial to sealing between the water stop and the side wall of the outer sleeve, so that the cooling water flows more orderly, the dead water area is reduced, and the cooling of the tuyere small sleeve is facilitated.

In some embodiments, the cooling water flow channels formed by the plurality of water blocking plates 151 include a water inlet flow channel 171 and a water return flow channel 172. Wherein, the water inlet channel 171 and the water return channel 172 are contacted with the side wall of the outer sleeve, which is beneficial to better radiating the heat of the outer sleeve, so that the outer sleeve can resist the high temperature environment in the furnace. According to one embodiment of the present application, the water inlet channel 171 may be linear, and the cooling water directly enters the front end chamber 1312 of the jacket from the jacket main body 110 through the water inlet channel 171, so as to facilitate heat dissipation at the front end of the jacket. In some embodiments, the inlet channel 171 may have other shapes. For example: the spiral type is beneficial to heat dissipation of the side wall of the outer sleeve.

According to one embodiment of the present application, the return water flow passage 172 may be a longitudinal turn-back type, which is disposed in parallel with the inlet water flow passage 171. According to one embodiment of the present application, the return water flow passage may have other shapes. Referring to fig. 10, fig. 10 is a schematic view of an outer deflector water flow according to another embodiment of the present application. The return water flow passage may be a lateral turn-back type, and may be provided perpendicular to the water inlet flow passage 171. In some embodiments, the return water flow passage may also be a spiral or the like.

In some embodiments, a partition plate (not shown) may be further included in the front end chamber 1312 of the outer sleeve, and may be used to divide a port through which the cooling water enters the front end chamber and a port through which the cooling water exits the front end chamber, so that the cooling water enters the front end chamber, flows around the front end chamber, and exits the front end chamber, and prevents the cooling water from returning and exiting after entering the front end chamber. In some embodiments, the divider plate is similar to the baffle 144 of the inner deflector and will not be described in detail herein.

This application wind gap cover is through the structural design that returns for the inside two independent cavitys that include of cover, form the cooling structure of two business turn over, make the cover possess more good cooling capacity when using, even a cooling structure inefficacy moreover, another cooling structure sustainable use, great increase the life of wind gap cover, make the wind gap cover can satisfy the demand of blast furnace in order damping down, be favorable to the steady operation and the output of blast furnace.

The above embodiments are provided for illustrating the present utility model and not for limiting the present utility model, and various changes and modifications may be made by one skilled in the relevant art without departing from the scope of the present utility model, therefore, all equivalent technical solutions shall fall within the scope of the present disclosure.

Claims (10)

1. A tuyere small sleeve, comprising:

a jacket body including a first cooling water inlet, a first cooling water outlet, a second cooling water inlet, and a second cooling water outlet;

an inner sleeve in butt joint with a first part of the sleeve main body, wherein the inner sleeve comprises a first cavity which is communicated with the first cooling water inlet and the first cooling water outlet;

the outer sleeve is arranged outside the inner sleeve and is in butt joint with the second part of the sleeve main body, a second cavity is formed between the outer sleeve and the inner sleeve, and the second cavity is communicated with the second cooling water inlet and the second cooling water outlet;

an inner deflector disposed in the first cavity and configured to guide cooling water to flow in the first cavity; and

an outer deflector disposed in the second cavity and configured to direct cooling water to flow in the second cavity;

the inner sleeve and the outer sleeve are in first welding connection, and a welding seam of the first welding connection is positioned on the inner wall of the small wind hole of the wind port.

2. The tuyere small sleeve of claim 1, wherein the inner sleeve comprises an inner wall, an outer wall and a bent portion therebetween which are integrally formed, the inner sleeve being connected to the first portion of the sleeve body through a free end of the inner wall and a free end of the outer wall.

3. The tuyere small sleeve of claim 1, wherein the outer sleeve comprises a side wall and a front wall integrally formed therewith, the outer sleeve being connected to the second portion of the sleeve body through a free end of the side wall, the outer sleeve being connected to the inner sleeve through a free end of the front wall.

4. A tuyere small sleeve as claimed in claim 3, wherein the front wall of the outer sleeve defines a front end portion of the wind hole; the inner wall of the inner sleeve defines a middle portion of the wind hole; the sleeve body defines a rear end portion of the wind hole.

5. The tuyere small sleeve of claim 2, wherein the connection between the inner sleeve inner wall and the sleeve main body is a second welded connection, and a weld of the second welded connection faces the wind hole.

6. A tuyere small sleeve as claimed in claim 3, wherein the connection between the outer wall of the inner sleeve and the sleeve body is a third welded connection, and a welded seam of the third welded connection is located in the second cavity.

7. The tuyere small sleeve of claim 6, wherein the connection between the outer sleeve sidewall and the sleeve body is a fourth welded connection, a weld of the fourth welded connection being remote from a weld of the third welded connection.

8. The tuyere small sleeve of claim 1, wherein the sleeve body comprises a first water inlet chamber, a first water outlet chamber, a second water inlet chamber and a second water outlet chamber, the first water inlet chamber is communicated with the first cooling water inlet, the first water outlet chamber is communicated with the first cooling water outlet, the second water inlet chamber is communicated with the second cooling water inlet, and the second water outlet chamber is communicated with the second cooling water outlet.

9. The tuyere small sleeve of claim 8, wherein the sleeve body comprises an additional water channel, the additional water channel being adjacent to the second portion of the sleeve body.

10. The tuyere small sleeve of claim 9, wherein the additional water channel is communicated with the first water inlet chamber or the first water outlet chamber.

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