Split type gas tuyere small sleeve

Abstract

The utility model discloses a split type gas tuyere small sleeve which comprises a flange, an inner sleeve, an outer sleeve, a fluid director and a gas inlet pipe, an inner cavity is defined by the outer sleeve, the inner sleeve and the flange, and the fluid director is arranged in the inner cavity; the tuyere small sleeve is provided with a front-back hot air channel, the rear end of the inner sleeve is welded with the front end of the inner wall of the flange, the rear end of the outer sleeve is welded with the front end of the outer wall of the flange, and the front end of the outer sleeve is welded with the front end of the inner sleeve; the air inlet pipe is arranged in the inner cavity, an air inlet of the air inlet pipe is formed in the surface of the flange, and an air outlet of the air inlet pipe is located in the front of the hot air channel. The front portion of the air inlet pipe is a linear air outlet section, and the center line or the extension line of the linear air outlet section is located in the front end opening of the hot air channel. The split type gas tuyere small sleeve can effectively prevent gas and air (or oxygen-enriched air) from burning after being mixed in the hot air channel, so that the gas and the air (or the oxygen-enriched air) are burnt in a rotary area in a blast furnace, heat loss is reduced, the inner wall of the hot air channel is prevented from being damaged, and normal operation of the tuyere small sleeve is facilitated.

Description

Technical Field

[0001] The utility model relates to a cooling device for a blast - furnace air supply system, in particular to a split - type gas tuyere sleeve. Background Art

[0002] The existing gas tuyere sleeve includes a flange, an inner sleeve, an outer sleeve, a deflector and an inlet pipe. The outer sleeve is sleeved outside the inner sleeve, and the outer sleeve, the inner sleeve and the flange enclose an internal cavity. The deflector is arranged in the internal cavity; the flange is provided with a water inlet and a water outlet; the tuyere sleeve has a hot - air channel running from front to back (the hot - air channel is formed by the inner side surface of the inner wall of the outer sleeve, the inner side surface of the inner sleeve and the inner side surface of the inner wall of the flange); the flange, the inner sleeve and the inlet pipe are integrally cast, the inlet pipe is in the internal cavity, the air inlet of the inlet pipe opens on the rear end face of the flange, and the air outlet of the inlet pipe opens on the front half part of the inner side surface of the inner sleeve (for example, a ventilation tuyere sleeve disclosed in the utility model patent with the authorization announcement number CN201678689U). When gas is introduced into the inlet pipe and air or oxygen is introduced into the hot - air channel, the gas ejected from the air outlet of the inlet pipe mixes and burns with air (or oxygen - enriched air) inside the hot - air channel, which will generate high temperature in the hot - air channel, cause heat loss, easily lead to damage to the inner wall of the hot - air channel, and affect the normal operation of the tuyere sleeve. Summary of the Utility Model

[0003] The problem to be solved by the utility model is to provide a split - type gas tuyere sleeve, which can effectively avoid the mixing and combustion of gas and air (or oxygen - enriched air) in the hot - air channel, reduce heat loss, prevent damage to the inner wall of the hot - air channel, and is beneficial to the normal operation of the tuyere sleeve.

[0004] In order to solve the above - mentioned technical problems, the technical scheme adopted by the utility model is as follows:

[0005] A split - type gas tuyere sleeve includes a flange, an inner sleeve, an outer sleeve, a deflector and an inlet pipe. The outer sleeve, the inner sleeve and the flange enclose an internal cavity, and the deflector is arranged in the internal cavity; the flange is provided with a water inlet and a water outlet; the tuyere sleeve has a hot - air channel running from front to back, and is characterized in that: the rear end of the inner sleeve is welded to the front end of the inner wall of the flange, the rear end of the outer sleeve is welded to the front end of the outer wall of the flange, and the front end of the outer sleeve is welded to the front end of the inner sleeve; the inlet pipe is arranged in the internal cavity, the air inlet of the inlet pipe opens on the surface of the flange, and the air outlet of the inlet pipe is in the front part of the hot - air channel; the front part of the inlet pipe is a linear air - outlet section, and the center line or its extension line of the linear air - outlet section is in the front - end opening of the hot - air channel.

[0006] The above definitions of inner and outer: taking the axis of the hot - air channel of the tuyere sleeve as the standard, the side close to the axis of the hot - air channel is the inner side, and the side far from the axis of the hot - air channel is the outer side.

[0007] Since the air outlet of the intake pipe is connected to the hot air passage and is located at the front of the hot air passage, and the center line of the linear outlet section or its extension line is within the front end opening of the hot air passage. Therefore, when gas is introduced into the intake pipe and air or oxygen is introduced into the hot air passage, the gas is ejected from the air outlet of the intake pipe towards the front end opening of the hot air passage after passing through the linear outlet section of the intake pipe, and enters the blast furnace cavity under the drive of the air flow in the hot air passage, enabling the gas to be mixed and burned with air (or oxygen-enriched air) at a position closer to the front of the front end opening of the hot air passage (the raceway area within the blast furnace body). This can avoid the direct mixing and burning of gas with air (or oxygen-enriched air) inside the hot air passage, reduce heat loss, prevent damage to the inner wall of the hot air passage, and ensure the normal operation of the tuyere sleeve.

[0008] In a preferred embodiment, the distance between the center of the air outlet of the intake pipe and the front end opening of the hot air passage is 10 mm - 260 mm.

[0009] Since the traditional flange, inner sleeve, and intake pipe are integrally castings, the formed tissue grains are coarse and there are casting defects, resulting in poor mechanical properties. Moreover, the weight of the casting is too heavy, requiring a large amount of materials and increasing material costs. The inner wall of the intake pipe formed by casting is rough, the resistance of the pipe wall encountered by the gas entering the intake pipe is large, and the energy consumption for pushing the gas into the intake pipe is high. Thus, in a preferred embodiment, the flange, inner sleeve, and outer sleeve are all forgings. The above-mentioned flange, inner sleeve, and outer sleeve are each made by forging process, and then the flange, inner sleeve, outer sleeve, and intake pipe are connected, changing the traditional one-piece casting method. The forged flange, inner sleeve, and outer sleeve are dense in texture, have good mechanical properties, have no casting defects, are convenient for processing, reduce weight, and lower costs. And the inner wall of the intake pipe formed by forging is smooth, the resistance of the pipe wall encountered by the gas entering the intake pipe is small, the energy consumption for pushing the gas into the intake pipe is small, and it is energy-saving.

[0010] In another preferred embodiment, the flange is a casting, and the inner sleeve and outer sleeve are both forgings.

[0011] In a preferred embodiment, the materials of the inner sleeve and outer sleeve are copper; the materials of the flange, intake pipe, and deflector are copper or steel. Since steel has higher strength and lower cost, using steel flanges and intake pipes can effectively reduce the overall cost of the tuyere sleeve.

[0012] In a preferred embodiment, a wear-resistant layer is provided on the area of the inner wall of the hot air passage opposite to the air outlet of the intake pipe. The above-mentioned wear-resistant layer has the performance of high-temperature resistance and wear resistance, covering the area of the inner wall of the hot air passage opposite to the air outlet of the intake pipe, and can prevent the gas from directly blowing on the inner side surface of the inner sleeve opposite to the air outlet of the intake pipe.

[0013] In a further preferred embodiment, the thickness of the wear-resistant layer is 1 mm - 6 mm.

[0014] In a further preferred embodiment, the wear-resistant layer is a metal surfacing layer or a ceramic bushing.

[0015] In a still further preferred embodiment, the outer side surface of the ceramic bushing is bonded to the inner wall of the hot air passage by a high-temperature resistant adhesive. The above high-temperature resistant adhesive can be a high-temperature glue with the model of Meisiguodun 3.1.

[0016] In the first preferred embodiment, the air outlet of the intake pipe is flush with the inner side surface of the inner sleeve, and the extension line of the center line of the linear air outlet section is within the front opening of the hot air passage. Since the air outlet is flush with the inner side surface of the inner sleeve, the gas flow path in the hot air passage is smoother, which can reduce the gas resistance.

[0017] In the second preferred embodiment, the air outlet of the intake pipe extends into the hot air passage, and the extension line of the center line of the linear air outlet section is within the front opening of the hot air passage. By setting it in this way, the air outlet of the intake pipe protrudes slightly from the inner side surface of the inner sleeve, which can make the fuel gas blow out to a position further forward at the front opening of the hot air passage.

[0018] In a preferred embodiment, the front end of the outer sleeve is connected to the front end of the inner sleeve by a first circumferential weld, and the first circumferential weld is on the front end face of the tuyere small sleeve; the rear end of the inner sleeve is connected to the front end of the inner wall of the flange by a second circumferential weld, and the rear end of the outer sleeve is connected to the front end of the outer wall of the flange by a third circumferential weld. By setting the first circumferential weld on the front end face of the tuyere small sleeve, the first circumferential weld is avoided from the air outlet of the intake pipe and the front opening of the hot air passage, preventing the first circumferential weld from being directly blown by the fuel gas and air (or oxygen-enriched air), and preventing wear in the area where the first circumferential weld is located, thus extending the service life of the tuyere small sleeve.

[0019] In a further preferred embodiment, a front end face protective cover is provided on the front end face of the tuyere small sleeve. The front end face protective cover is provided with a plurality of through holes, and a plurality of screw holes corresponding to the through holes are provided on the front end face of the tuyere small sleeve. Fixing screws are installed in each screw hole, the rod parts of each fixing screw pass through the corresponding through hole, and the heads of each fixing screw and the front end face of the tuyere small sleeve jointly lock the front end face protective cover; the first circumferential weld is covered by the front end face protective cover. The front end face protective cover is locked on the front end of the outer sleeve of the tuyere small sleeve by each fixing screw.

[0020] In a still further preferred embodiment, the front end face protective cover is adhered to the front end face of the tuyere small sleeve by a high-temperature resistant adhesive.

[0021] In another preferred embodiment, the front end of the outer sleeve is connected to the front end of the inner sleeve through a first circumferential weld. The first circumferential weld is located in the front part of the hot air passage and on the front side of the air outlet of the intake pipe. A circumferential surfacing layer is welded to the front part of the inner wall of the hot air passage, and the first circumferential weld is covered by the circumferential surfacing layer. The rear end of the inner sleeve is connected to the front end of the inner wall of the flange through a second circumferential weld, and the rear end of the outer sleeve is connected to the front end of the outer wall of the flange through a third circumferential weld. The thickness of the above-mentioned circumferential surfacing layer is generally 2-3 mm. The above-mentioned circumferential surfacing layer has the properties of high temperature resistance and wear resistance. The first circumferential weld is covered by the circumferential surfacing layer, which can prevent the first circumferential weld from being directly blown by various gases, avoid wear in the area where the first circumferential weld is located, and extend the service life of the tuyere small sleeve.

[0022] Compared with the prior art, the utility model has the following advantages:

[0023] The utility model can effectively prevent the combustion of the gas and air (or oxygen-enriched air) after mixing in the hot air passage, reduce heat loss, prevent damage to the inner wall of the hot air passage, and is beneficial to the normal operation of the tuyere small sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of Embodiment 1 of the utility model;

[0025] Figure 2 is a schematic structural diagram of Embodiment 2 of the utility model;

[0026] Figure 3 is a schematic structural diagram of Embodiment 3 of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following combines the drawings and specific embodiments to specifically describe the utility model.

[0028] Embodiment 1, as Figure 1 shown, the split gas tuyere small sleeve in this embodiment includes a flange 1, an inner sleeve 2, an outer sleeve 3, a deflector 4 and an intake pipe 5. The outer sleeve 3, the inner sleeve 2 and the flange 1 enclose an internal cavity 6, and the deflector 4 is arranged in the internal cavity 6. The flange 1 is provided with a water inlet and a water outlet. The tuyere small sleeve has a hot air passage 7 running from front to back. The rear end of the inner sleeve 2 is welded to the front end of the inner wall of the flange 1, the rear end of the outer sleeve 3 is welded to the front end of the outer wall of the flange 1, and the front end of the outer sleeve 3 is welded to the front end of the inner sleeve 2. The intake pipe 5 is arranged in the internal cavity 6. The air inlet 51 of the intake pipe 5 opens on the surface of the flange 1, and the air outlet 52 of the intake pipe 5 is located in the front part of the hot air passage 7. The front part of the intake pipe 5 is a straight air outlet section 53, and the center line 531 of the straight air outlet section 53 or its extension line is located in the front end opening 71 of the hot air passage 7.

[0029] The above definitions of inner and outer: Taking the axis of the hot air passage 7 of the tuyere small sleeve as the reference, the side closer to the axis of the hot air passage 7 is the inner side, and the side farther from the axis of the hot air passage 7 is the outer side.

[0030] Since the air outlet 52 of the intake pipe 5 is communicated with the hot air passage 7 and is located at the front of the hot air passage 7, the center line 531 of the linear air outlet section 53 or its extension line is within the front end opening 71 of the hot air passage 7. Therefore, when gas is introduced into the intake pipe 5 and air or oxygen is introduced into the hot air passage 7, the gas is ejected from the air outlet 52 of the intake pipe 5 towards the front end opening 71 of the hot air passage 7 after passing through the linear air outlet section 53 of the intake pipe 5, and enters the blast furnace cavity under the drive of the air flow in the hot air passage 7, so that the gas and air (or oxygen-enriched air) are mixed and burned at a position closer to the front of the front end opening 71 of the hot air passage 7 (in the raceway within the blast furnace body), which can avoid the direct mixing and burning of the gas and air (or oxygen-enriched air) inside the hot air passage 7, reduce heat loss, prevent damage to the inner wall of the hot air passage 7, and ensure the normal operation of the tuyere small sleeve.

[0031] The distance L between the center A of the air outlet 52 of the intake pipe 5 and the front end opening 71 of the hot air passage 7 is 10 mm - 260 mm.

[0032] Since the traditional flange 1, inner sleeve 2, and intake pipe 5 are integrally castings, the formed tissue grains are coarse and there are casting defects, and the mechanical properties are poor. Moreover, the weight of the casting is too heavy, which requires a large amount of materials and increases the material cost; the inner wall of the intake pipe 5 formed by casting is rough, the resistance of the pipe wall encountered by the gas entering the intake pipe 5 is large, and the energy consumption for pushing the gas into the intake pipe 5 is large. In the preferred solution, the flange 1, inner sleeve 2, and outer sleeve 3 are all forgings. The above flange 1, inner sleeve 2, and outer sleeve 3 are each made by forging process, and then the flange 1, inner sleeve 2, outer sleeve 3, and intake pipe 5 are connected, changing the traditional one-piece casting method. The forged flange 1, inner sleeve 2, and outer sleeve 3 are dense in texture, have good mechanical properties, have no casting defects, are convenient for processing, reduce weight, and lower cost; and the inner wall of the intake pipe 5 formed by forging is smooth, the resistance of the pipe wall encountered by the gas entering the intake pipe 5 is small, and the energy consumption for pushing the gas into the intake pipe 5 is small, saving energy.

[0033] The material of the inner sleeve 2 and the outer sleeve 3 is copper; the material of the flange 1, intake pipe 5, and deflector 4 is steel. Since the strength of steel is higher and the cost is lower, using steel flanges 1 and intake pipes 5 can effectively reduce the overall cost of the tuyere small sleeve.

[0034] On the area of the inner wall of the hot air passage 7 facing the air outlet 52 of the intake pipe 5, a wear-resistant layer 8 is provided. The above-mentioned wear-resistant layer 8 has the performance of high-temperature resistance and wear resistance, covers the area of the inner wall of the hot air passage 7 facing the air outlet 52 of the intake pipe 5, and can prevent the direct blowing of gas on the inner side surface of the inner sleeve 2 facing the air outlet 52 of the intake pipe 5.

[0035] The thickness of the wear-resistant layer 8 is 1 mm - 6 mm. The wear-resistant layer 8 is a metal surfacing layer.

[0036] The air outlet 52 of the intake pipe 5 is flush with the inner side surface of the inner sleeve 2, and the extension line of the center line 531 of the linear air outlet section 53 is located within the front end opening 71 of the hot air passage 7. Since the air outlet 52 is flush with the inner side surface of the inner sleeve 2, the gas flow path in the hot air passage 7 is smoother, which can reduce the gas resistance.

[0037] The front end of the outer sleeve 3 is connected to the front end of the inner sleeve 2 through a first circumferential weld 10, and the first circumferential weld 10 is located on the front end surface of the tuyere small sleeve; the rear end of the inner sleeve 2 is connected to the front end of the inner wall of the flange 1 through a second circumferential weld 11, and the rear end of the outer sleeve 3 is connected to the front end of the outer wall of the flange 1 through a third circumferential weld 12. By setting the first circumferential weld 10 on the front end surface of the tuyere small sleeve, the first circumferential weld 10 is avoided from the air outlet 52 of the intake pipe 5 and the front end opening 71 of the hot air passage 7, preventing the first circumferential weld 10 from being directly blown by gas and air (or oxygen-enriched air), and preventing wear from occurring in the area where the first circumferential weld 10 is located, thus extending the service life of the tuyere small sleeve.

[0038] On the front end surface of the tuyere small sleeve, a front end surface protective cover 9 is provided. The front end surface protective cover 9 is provided with a plurality of through holes 91. On the front end surface of the tuyere small sleeve, a plurality of screw holes 92 corresponding to the through holes 91 are provided. In each screw hole 92, a fixing screw 93 is installed. The rod part of each fixing screw 93 passes through the corresponding through hole 91, and the head of each fixing screw 93 and the front end surface of the tuyere small sleeve jointly lock the front end surface protective cover 9; the first circumferential weld 10 is covered by the front end surface protective cover 9. The front end surface protective cover 9 is locked on the front end surface of the outer sleeve 3 of the tuyere small sleeve through each fixing screw 93.

[0039] The front end surface protective cover 9 is adhered to the front end surface of the tuyere small sleeve through a high-temperature resistant adhesive 94.

[0040] Embodiment 2, as Figure 2 shown, the difference between this embodiment and Embodiment 1 is that:

[0041] The air outlet 52 of the intake pipe 5 extends into the hot air passage 7, and the extension line of the center line 531 of the linear air outlet section 53 is within the front end opening 71 of the hot air passage 7. By setting it in this way, the air outlet 51 of the intake pipe 5 slightly protrudes from the inner side surface of the inner sleeve 2, enabling the fuel gas to be blown out towards the position closer to the front end opening 71 of the hot air passage 7.

[0042] Embodiment 3, as Figure 3 shown, the difference between this embodiment and Embodiment 1 is that:

[0043] The front end of the outer sleeve 3 is connected to the front end of the inner sleeve 2 through the first annular weld 10. The first annular weld 10 is located in the front part of the hot air passage 7 and on the front side of the air outlet 52 of the intake pipe 5. The front part of the inner wall of the hot air passage 7 is welded with an annular surfacing layer 72, and the first annular weld 10 is covered by the annular surfacing layer 72; the rear end of the inner sleeve 2 is connected to the front end of the inner wall of the flange 1 through the second annular weld 11, and the rear end of the outer sleeve 3 is connected to the front end of the outer wall of the flange 1 through the third annular weld 12. The thickness of the above-mentioned annular surfacing layer 72 is generally 2 - 3 mm. The above-mentioned annular surfacing layer 72 has the properties of high temperature resistance and wear resistance. The first annular weld 10 is covered by the annular surfacing layer 72, which can prevent the first annular weld 10 from being directly blown by various fuel gases, avoid wear in the area where the first annular weld 10 is located, and extend the service life of the tuyere sleeve.

[0044] In addition, it should be noted that for the specific embodiments described in this specification, the names of their respective parts, etc. can be different. Any equivalent or simple changes made according to the structure, features, and principles described in the inventive concept of this utility model patent are included within the protection scope of this utility model patent. Those skilled in the technical field to which this utility model belongs can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the structure of this utility model or exceed the scope defined by this claim book, they should all fall within the protection scope of this utility model.

Claims

1. A split-type gas tuyere small sleeve, comprising a flange, an inner sleeve, an outer sleeve, a flow guide device and an air inlet pipe. The outer sleeve, the inner sleeve and the flange enclose an internal cavity, and the flow guide device is arranged in the internal cavity; the flange is provided with a water inlet and a water outlet; the tuyere small sleeve has a hot air channel running from front to back, and is characterized in that: The rear end of the inner sleeve is welded to the front end of the inner wall of the flange, the rear end of the outer sleeve is welded to the front end of the outer wall of the flange, and the front end of the outer sleeve is welded to the front end of the inner sleeve; the air inlet pipe is arranged in the internal cavity, the air inlet of the air inlet pipe opens on the surface of the flange, and the air outlet of the air inlet pipe is located at the front part of the hot air channel; the front part of the air inlet pipe is a straight air outlet section, and the center line or its extension line of the straight air outlet section is within the front end opening of the hot air channel.

2. The split gas tuyere small sleeve according to claim 1, wherein: The distance between the center of the air outlet of the air inlet pipe and the front end opening of the hot air channel is 10 mm - 260 mm.

3. The split gas tuyere small sleeve according to claim 1, characterized in that: The flange, inner sleeve, and outer sleeve are all forging parts; Or the flange is a casting part, and the inner sleeve and outer sleeve are both forging parts.

4. The split gas tuyere small sleeve according to claim 1 or 3, characterized in that: The materials of the inner sleeve and outer sleeve are copper; the materials of the flange, air inlet pipe, and deflector are copper or steel.

5. The split gas tuyere small sleeve according to claim 1, characterized in that: A wear-resistant layer is provided on the area of the inner wall of the hot air channel facing the air outlet of the air inlet pipe.

6. The split gas tuyere small sleeve according to claim 5, characterized in that: The thickness of the wear-resistant layer is 1 mm - 6 mm.

7. The split gas tuyere small sleeve according to claim 5, characterized in that: The wear-resistant layer is a metal surfacing layer or a ceramic bushing.

8. The split gas tuyere small sleeve according to claim 1, characterized in that: The air outlet of the air inlet pipe is flush with the inner side surface of the inner sleeve, and the extension line of the center line of the straight air outlet section is within the front end opening of the hot air channel.

9. The split gas tuyere small sleeve according to claim 1, wherein: The air outlet of the air inlet pipe extends into the hot air channel, and the extension line of the center line of the straight air outlet section is within the front end opening of the hot air channel.

Images