CN219772163U - Thermal-insulated wind gap cover - Google Patents

Abstract

The utility model relates to a thermal insulation tuyere small sleeve, which comprises the following components: a jacket body including a cooling water inlet and a cooling water outlet; an inner sleeve interfacing with a first portion of the sleeve body; the outer sleeve is arranged outside the inner sleeve and is in butt joint with the second part of the sleeve main body, a cavity is formed between the outer sleeve and the inner sleeve, and the cavity is communicated with the cooling water inlet and the cooling water outlet; and a deflector disposed in the cavity and configured to guide cooling water to flow in the cavity; wherein the surface of one side of the inner sleeve far away from the outer sleeve comprises one or more heat insulation layers; wherein, the inner sleeve comprises a steel sleeve, the front end of which is connected with the outer sleeve, and the rear end of which is connected with the sleeve main body. According to the tuyere small sleeve, through the new structural design, the cooling water chamber of the small sleeve is isolated from the wind hole through which hot wind passes, so that the influence of cooling water on the temperature of the hot wind can be reduced, the loss of the temperature of the hot wind can be reduced, and the economic benefit can be improved.

Description

Thermal-insulated wind gap cover

Technical Field

The utility model relates to the technical field of blast furnaces, in particular to a heat-insulating 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 conveying hot air 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, and is also easily worn by drop penetration of metal liquid drops and circulation of coke, so that the working environment of the blast furnace tuyere small sleeve is very bad, and the tuyere small sleeve needs to be cooled and radiated continuously. However, when the tuyere small sleeve is used for conveying hot air for the blast furnace, the hot air input into the blast furnace passes through the tuyere small sleeve, and the temperature of the hot air passing through the tuyere small sleeve is reduced due to the excellent heat conduction effect of the tuyere small sleeve, so that the economic index of the operation of the blast furnace is influenced, and the conventional heat-insulation tuyere small sleeve is difficult to manufacture.

Disclosure of Invention

Aiming at the technical problems in the prior art, the utility model provides a heat-insulating tuyere small sleeve, which comprises the following components: a jacket body including a cooling water inlet and a cooling water outlet; an inner sleeve interfacing with a first portion of the sleeve body; an outer sleeve disposed outside the inner sleeve and interfacing with the second portion of the sleeve body, wherein a cavity is formed between the outer sleeve and the inner sleeve, the cavity being in communication with the cooling water inlet and the cooling water outlet; and a deflector disposed in the cavity and configured to guide cooling water to flow in the cavity; wherein the surface of one side of the inner sleeve far away from the outer sleeve comprises one or more heat insulation layers; wherein, the inner sleeve comprises a steel sleeve, the front end of which is connected with the outer sleeve, and the rear end of which is connected with the sleeve main body.

A thermally insulated tuyere small sleeve as above, said inner sleeve comprising one or more grooves on a side surface thereof remote from said outer sleeve, configured to receive and protect said thermal insulation layer.

The thermal insulation tuyere small sleeve as described above, further comprising: the steel sleeve comprises a sleeve body, a first transition section and a second transition section, wherein the front end of the steel sleeve is connected with the outer sleeve through the first transition section, and the rear end of the steel sleeve is connected with the sleeve body through the second transition section.

The thermal insulating tuyere small sleeve as described above, the outer sleeve comprises a side wall and a front wall integrally formed with each other, 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.

The thermal insulating tuyere small sleeve as described above, the deflector comprises a front partition plate located near the front wall of the outer sleeve, an intermediate partition plate between the front partition plate and the sleeve main body, and a plurality of water-stop plates between the intermediate partition plate and the side walls of the outer sleeve.

The heat-insulating tuyere small sleeve, wherein the cavity comprises a side cavity and a front end cavity, and the flow director is positioned in the side cavity.

The thermal insulation tuyere small sleeve, wherein one side of the inner sleeve, which is close to the thermal insulation layer, comprises an adhesion layer which is configured to increase the adhesion force of the thermal insulation layer.

The heat-insulating tuyere small sleeve comprises a plurality of bulges or grooves which are arranged in a staggered mode, or sand blasting or shot blasting.

The insulated tuyere small sleeve as described above, further comprising one or more partition plates provided between the outer sleeve and the inner sleeve and configured to divide the chamber into a plurality of portions.

The insulating tuyere small sleeve as described above, wherein one side of the inner sleeve, which is close to the insulating layer, comprises a reflecting layer configured to reflect heat.

According to the tuyere small sleeve, through the new structural design, the cooling water chamber of the small sleeve is isolated from the wind hole through which hot wind passes, so that the influence of cooling water on the temperature of the hot wind can be reduced, the loss of the temperature of the hot wind can be reduced, and the economic benefit can be improved.

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 an insulating tuyere small sleeve according to an embodiment of the present utility model;

FIG. 2 is an exploded view of an insulating tuyere small sleeve according to an embodiment of the present utility model;

FIG. 3 is a side view of an insulating tuyere small sleeve according to an embodiment of the present utility model; and

FIG. 4 is a cross-sectional view of an insulating tuyere small sleeve according to an embodiment of the present utility model.

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 of the utility model. In the drawings, like reference numerals describe substantially similar components throughout the different views. Various specific embodiments of the utility model are described in sufficient detail below to enable those skilled in the art to practice the teachings of the utility model. It is to be understood that other embodiments may be utilized or structural, logical, or electrical changes may be made to embodiments of the present utility model.

The tuyere small sleeve is an important element in the operation of the blast furnace, and the hot air passing through the air hole of the tuyere small sleeve supplies heat to the blast furnace, which accounts for 20% -30% of the total heat of the blast furnace. In order to ensure the normal use of the tuyere small sleeve, the tuyere small sleeve is usually made of copper, so that the tuyere small sleeve has an excellent heat conduction effect (the heat conduction coefficient is 384W/(m.k)), and the temperature of hot air passing through the small sleeve is reduced. The research shows that the fuel ratio can be reduced by 20-30kg/t when the wind temperature of the blast furnace is increased by 100 ℃. The volume of the conventional tuyere small sleeve is 450 cubic meters, the diameter of an air inlet is phi 160, the diameter of an air outlet is phi 115, the air inlet speed is 230m/s, and the temperature of hot air is about 1100 ℃, so that the temperature of the hot air can be reduced to be close to 40 ℃ after passing through the tuyere small sleeve, more hot air needs to be supplemented for the blast furnace, so that the resource loss is caused, the economic index of the blast furnace is influenced, and various manufacturers are devoted to the research and development of the heat-insulating tuyere small sleeve at present, but the small sleeve is difficult to manufacture due to the increased structure, and the normal use of the small sleeve is seriously influenced.

The utility model provides a novel heat-insulating tuyere small sleeve, which is characterized in that a heat-insulating layer is arranged between a tuyere hole and a cooling and radiating system of the tuyere small sleeve to isolate cooling water from hot air, so that the heat conductivity coefficient of a part of the tuyere small sleeve (at least the part through which the hot air passes) can be reduced, the influence of the cooling and radiating system of the tuyere small sleeve on the hot air can be avoided, the temperature loss of the hot air is reduced, the fuel consumption is reduced, the waste of resources is reduced, and the economic benefit is improved.

The technical scheme of the utility model is further described by the 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 utility model and should not be used to limit the scope of the present utility model.

FIG. 1 is a schematic view of an insulating tuyere small sleeve according to an embodiment of the present utility model. Fig. 2 is an exploded view of an insulating tuyere small sleeve according to an embodiment of the present utility model. FIG. 3 is a side view of an insulating tuyere small sleeve according to an embodiment of the present utility model. FIG. 4 is a cross-sectional view of an insulating tuyere small sleeve according to an embodiment of the present utility model.

As shown, the thermally insulated tuyere small sleeve 100 (which may be simply referred to as a "tuyere small sleeve" or "small sleeve") includes a sleeve body 110, an inner sleeve 120, an outer sleeve 130, and a deflector 140. Wherein the jacket main body 110 may include a cooling water inlet 111 and a cooling water outlet 112; the inner sleeve 120 interfaces with a first portion of the sleeve body 110; the outer jacket 130 is disposed outside the inner jacket 120 and is abutted with the second portion of the jacket main body 110, a cavity 101 is formed between the outer jacket 130 and the inner jacket 120, and the cavity 101 communicates with the cooling water inlet 111 and the cooling water outlet 112; the flow guide 140 is disposed in the cavity 101, and can guide the cooling water to flow in the cavity, so as to dissipate heat for the tuyere small sleeve.

In some embodiments, the tuyere small sleeve 100 may further include a wind hole 150, which is provided in the tuyere small sleeve, and may be used to supply hot wind to the blast furnace or to inject auxiliary fuel. In some embodiments, the wind hole 150 extends through the entire tuyere small sleeve therein, the outer sleeve defining a front end portion 151 of the wind hole; the inner sleeve defines a middle portion 152 of the wind hole; the sleeve body defines a rear end portion 153 of the wind hole. In some embodiments, the front end portion of the wind hole 150 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.

In some embodiments, the sleeve body 110 is generally circular in shape, wherein a first portion of the sleeve body 110 is proximal to a middle portion of the sleeve body and a second portion of the sleeve body is distal from the middle portion of the sleeve body compared to the first portion. In some embodiments. The sleeve body 110 may further include a water inlet chamber and a water outlet chamber, wherein the water inlet chamber communicates with the cooling water inlet 111; the outlet chamber communicates with the cooling water outlet 112 and may be used to buffer cooling water from the inlet and outlet jackets by providing multiple chambers in the jacket body and communicating with the cooling water inlet and outlet. In some embodiments, the water inlet chamber and the water outlet chamber completely cover the entire sleeve body 110, so that the cooling water can occupy the entire sleeve body, and the sleeve body can be heat-dissipating and protected. In some embodiments, the volume occupied by the outlet chamber may be greater than the volume occupied by the inlet chamber. 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.

The technical scheme of the utility model is illustrated by the single-inlet and outlet tuyere small sleeve, the sleeve main body comprises a water inlet cavity and a water outlet cavity, and as understood by a person skilled in the art, the utility model can also be applied to other multi-inlet and outlet tuyere small sleeves, such as a double-inlet and double-outlet tuyere small sleeve, and the sleeve main body can comprise a plurality of water inlet cavities and a plurality of water outlet cavities.

In some embodiments, the surface of the inner sleeve 120 on the side away from the outer sleeve may include one or more insulation layers 121 that may isolate the chamber 101 from the air holes 150, thereby isolating the cooling water from the hot air, reducing the effect of the cooling water on the hot air passing through the air holes, reducing the temperature loss of the hot air, reducing the heat loss of the blast furnace, reducing the fuel consumption, and improving the economic efficiency. In some embodiments, the surface of the inner sleeve 120 on the side away from the outer sleeve may include one or more grooves to accommodate the insulation layer, prevent the insulation layer from occupying the volume of the air holes, affecting the delivery of hot air, and also protect the insulation layer from abrasion damage to the insulation layer or stripping the insulation layer from the inner sleeve when the air holes are blown.

According to one embodiment of the present utility model, the inner sleeve 120 may include a sleeve 122. Wherein the sleeve may be connected at both ends to the first portion of the sleeve body and the outer jacket. In some embodiments, the junction of the sleeve 122 with the sleeve body and the outer sleeve, the outer sleeve and/or the sleeve body having a width greater than the sleeve 122, the difference in width between the two may effectively protect the insulation against the thermal insulation being broken and stripped by the hot air through the air holes. In some embodiments, the thickness of sleeve 122 may be 2-10mm.

In some embodiments, the material of the inner sleeve or a portion thereof may be steel or a steel alloy. According to one embodiment of the present utility model, the sleeve 122 may be a stainless steel material, which has reduced heat conductivity relative to copper, and is advantageous for isolating the chamber 101 from the air holes 150, protecting the air holes from the hot air, and improving the structural strength of the tuyere small sleeve.

In some embodiments, the sleeve 122 may be coupled to the outer jacket and/or the jacket body via a transition section (not shown). In some embodiments, the tuyere small sleeve 100 may further comprise connection plates (not shown in the drawings), which may be provided at both sides of the sleeve, and may be used for connecting the inner sleeve with the sleeve body and/or the outer sleeve. In some embodiments, the material of the connection plate may be copper or copper alloy, or steel alloy.

In some embodiments, the connection plate may be a transition section where the inner sleeve is connected to the outer sleeve and/or sleeve body. In some embodiments, the connection plate may also be part of, or pre-attached to, the outer sleeve and/or sleeve body. In some embodiments, the connection plate may include a notch to accommodate the inner sleeve so that it may be directly connected to the inner sleeve to facilitate the manufacture of the tuyere small sleeve. In some embodiments, the notch of the connection plate and the inner sleeve have a combined width of 5-30mm.

According to one embodiment of the present utility model, the material of the insulating layer may be a low thermal conductive material, which may effectively thermally isolate the chamber 101 from the wind hole. In some embodiments, the low thermal conductivity material has a thermal conductivity of not more than 2W/(m x k) such that the temperature difference between the inside and outside of the tuyere small sleeve is at least 300 ℃. In some embodiments, the insulating layer may be one or more of a castable, ceramic, insulating paint, or other non-metallic material.

In some embodiments, an adhesion layer (not shown) may be included on a surface of the sleeve adjacent to the insulating layer 121, which may be used to increase adhesion of the insulating layer, facilitate adhesion of the insulating layer to the inner sleeve, and facilitate reinforcement of the connection between the insulating layer and the inner sleeve, prevent the insulating layer from falling off, and affect normal use of the tuyere small sleeve. In some embodiments, the adhesive layer may include a plurality of ribs or grooves that are staggered, so that the sleeve surface may form a mesh surface, which is beneficial to increasing the adhesion of the sleeve surface. In some embodiments, the attachment layer may also include shot blasting, which may be used to roughen the sleeve surface and increase adhesion. In some embodiments, the attachment layer may also include grit blasting, with which the sleeve surface may be roughened to increase adhesion.

In some embodiments, the sleeve may further include a reflective layer (not shown) on a side surface of the sleeve adjacent to the insulating layer 121, which may be used to reflect heat, thereby isolating the chamber 101 from the air holes 150. In some embodiments, the reflective layer may be disposed between the sleeve and the insulating layer, so that heat of the cooling water may be reflected and an insulating effect of the insulating layer may be improved.

In some embodiments, the sleeve 122 may be welded to the sleeve body 110 and the outer sleeve, and the weld therebetween may face the wind hole 150 and be located on the inner wall of the wind hole, so as to protect the weld path from the high temperature in the furnace, thereby damaging the structure of the tuyere small sleeve, and also prevent the weld path from affecting the heat insulation layer disposed on the inner sleeve, thereby affecting the connection stability of the heat insulation layer and the inner sleeve.

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 retainer ring 124 of 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 walls 132 of the outer sleeve are positioned outside the inner sleeve 120 and the front wall 133 of the outer sleeve surrounds the front end of the inner sleeve 120 so that the outer sleeve may 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 the metal droplets or from being damaged by the metal liquid. According to a preferred embodiment of the utility model, 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 utility model, the thickness of the front wall 133 may be 28mm.

In some embodiments, the flow director 140 includes a front bulkhead 141 located adjacent the jacket front wall 133, an intermediate bulkhead 142 between the front bulkhead and the jacket body, and a plurality of water baffles 143 between the intermediate bulkhead and the jacket side walls. 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.

In some embodiments, the cavity 101 may also include a side chamber 1011 and a front end chamber 1012, and the deflector 140 may be located in the side chamber 1011 and may direct the flow of water into the front end chamber 1012 or the cooling water exiting the front end chamber 1012.

In some embodiments, the deflector may divide the side chamber 1011 into multiple parts (the water inlet chamber 1013 and the water outlet chamber 1014), and when cooling water enters the chamber 101, it enters the water inlet chamber 1013, then enters the front end chamber 1012 from the water inlet chamber 1013, then enters the water outlet chamber 1014, and finally exits the chamber 101 from the water outlet chamber 1014.

In some embodiments, a plurality of water stop plates 143 may be provided in the water outlet chamber 1014, and a water return flow passage of the cooling water may be formed in the water outlet chamber 1014 to guide the flow of the cooling water. In some embodiments, a portion of the intermediate partition may be outwardly bent near the first portion of the sleeve body so as to be in communication with the sleeve body water inlet and/or outlet, which may allow cooling water to enter the water inlet chamber 1013 and/or exit the water outlet chamber 1014. In some embodiments, a plurality of water blocking plates 143 may be provided in the water inlet chamber 1013, and a water inlet flow path of the cooling water may be formed in the water outlet chamber 1013 to guide the cooling water to flow. 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 tuyere small sleeve is beneficial to extending into the blast furnace part to dissipate heat. In some embodiments, the cross-sectional area of the front end chamber 1012 is the smallest, the flow rate of water in the front chamber is the fastest, and the heat dissipation effect is the best.

In some embodiments, the deflector 140 may further include a water baffle (not shown) disposed on the front partition 141 and extending toward the front chamber 1012, so as to block the cooling water entering the front chamber 1012, so that the cooling water flows along the whole front chamber and enters the water outlet chamber, and prevent the water from flowing back into the water outlet chamber after entering the front chamber, which results in the front chamber forming a dead water area and affecting the heat dissipation of the tuyere small sleeve.

According to the air port small sleeve, through the new structural design, the cooling water chamber of the small sleeve is isolated from the air hole through which hot air passes, so that the influence of cooling water on the temperature of the hot air can be reduced, and the temperature drop of the hot air can be reduced by at least half, namely, the same air port small sleeve has the volume of 450 cubic meters in a blast furnace, the diameter of an air inlet is phi 160, the diameter of an air outlet is phi 115, the air inlet speed is 230m/s, and the temperature of the hot air is reduced by 20 ℃ at most after the hot air passes through the air port small sleeve under the condition that the temperature of the hot air is 1100 ℃, so that the temperature loss of the hot air is effectively reduced, and the economic benefit is improved.

Of course, the utility model can also be used for other structures of tuyere small sleeves, such as a tuyere small sleeve can also comprise one or more baffle plates (not shown in the figure), which can be arranged between the tuyere small sleeve and the inner sleeve and the outer sleeve, can divide the chamber into a plurality of parts (such as a plurality of chambers), and can meet the continuous use of a plurality of cooling structures of the tuyere small sleeve.

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 thermally insulated tuyere small sleeve, comprising:

a jacket body including a cooling water inlet and a cooling water outlet;

an inner sleeve interfacing with a first portion of the sleeve body;

an outer sleeve disposed outside the inner sleeve and interfacing with the second portion of the sleeve body, wherein a cavity is formed between the outer sleeve and the inner sleeve, the cavity being in communication with the cooling water inlet and the cooling water outlet; and

a deflector disposed in the cavity and configured to direct cooling water to flow in the cavity;

wherein the surface of one side of the inner sleeve far away from the outer sleeve comprises one or more heat insulation layers; wherein, the inner sleeve comprises a steel sleeve, the front end of which is connected with the outer sleeve, and the rear end of which is connected with the sleeve main body.

2. The insulating tuyere small sleeve of claim 1, wherein a side surface of the inner sleeve away from the outer sleeve comprises one or more grooves configured to receive and protect the insulating layer.

3. The insulating tuyere small sleeve of claim 1, further comprising: the steel sleeve comprises a sleeve body, a first transition section and a second transition section, wherein the front end of the steel sleeve is connected with the outer sleeve through the first transition section, and the rear end of the steel sleeve is connected with the sleeve body through the second transition section.

4. The thermally insulated 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.

5. The thermally insulated tuyere small sleeve of claim 4, wherein the deflector comprises a front partition plate located near the front wall of the outer sleeve, an intermediate partition plate between the front partition plate and the sleeve body, and a plurality of water stop plates between the intermediate partition plate and the side wall of the outer sleeve.

6. The thermally insulated tuyere small sleeve of claim 1, wherein the cavity comprises a side chamber and a front end chamber, the deflector being located in the side chamber.

7. The insulating tuyere small sleeve of claim 1, wherein a side of the inner sleeve adjacent to the insulating layer comprises an adhesion layer configured to increase an adhesion force of the insulating layer.

8. The thermally insulated tuyere small sleeve of claim 7, wherein the attaching layer comprises a plurality of protrusions or grooves arranged alternately, or sand blasted, or shot blasted.

9. The thermally insulated tuyere small sleeve of claim 1, further comprising one or more baffles disposed between the outer sleeve and the inner sleeve and configured to divide the cavity into a plurality of portions.

10. The insulating tuyere small sleeve of claim 1, wherein a side of the inner sleeve adjacent to the insulating layer comprises a reflective layer configured to reflect heat.