Flue gas sealing structure and converter steelmaking waste heat boiler system

Abstract

The utility model provides a flue gas sealing structure and a converter steelmaking waste heat boiler system, and belongs to the technical field of sealing devices, the flue gas sealing structure comprises a flue, an upper layer platform and a transverse flexible plug, the flue is provided with a sealing bottom plate protruding out of the outer wall of the flue along the radial direction of the flue, and the sealing bottom plate is annular and surrounds the flue; a mounting hole is formed in the upper-layer platform, the flue is arranged in the mounting hole in a penetrating manner, and a mounting gap is formed between the hole wall of the mounting hole and the outer wall of the flue; the transverse flexible plug is annular and surrounds the flue, a gap is formed between the inner wall of the transverse flexible plug and the outer wall of the flue, the transverse flexible plug is arranged corresponding to the sealing bottom plate, the transverse flexible plug is connected with the inner wall of the mounting hole and the sealing bottom plate in a sealed mode, and the transverse flexible plug and the sealing bottom plate plug the mounting gap. Flue gas is prevented from moving upwards to the upper-layer platform through the installation gap, the structure is simple, and the flue gas isolation effect is good while the use safety of the flue is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing devices, in particular to a flue gas sealing structure and a converter steelmaking waste heat boiler system. Background Art

[0002] In industrial production, flues are used to discharge industrial waste gas. Due to the special characteristics of flues, such as being in a high-temperature environment for a long time and having cooling pipes, etc., in order to facilitate the installation of the flue platform, a gap must be left between the platform installed on the flue and the outer wall of the flue. The reserved installation gap may cause the flue gas at the bottom of the flue to rise to the platform, polluting the environment and affecting the health of the workers on the platform. For example, a large amount of high-temperature flue gas is generated during converter smelting. In order to recover the heat in the high-temperature flue gas during converter smelting and reduce the exhaust gas temperature, a waste heat boiler system is installed at the converter smelting site. The vaporization cooling flue of the waste heat boiler system is arranged on the tower platform of the main steelmaking plant. The fixed section of the flue at the furnace mouth of the vaporization cooling flue is equipped with many coolant circulation pipes for cooling the high-temperature flue gas. They cannot be directly welded to the outer wall of the fixed section of the flue at the furnace mouth.

[0003] Currently, the smoke isolation chamber is located below the upper platform of the fixed section of the furnace mouth of the vaporization and cooling flue. Converter flue gas enters the smoke isolation chamber during converter tilting. This converter flue gas contains pollutants such as particulate matter, sulfur dioxide, nitrogen oxides, and carbon monoxide. Therefore, a dust removal system is installed to capture most of the harmful flue gas for treatment. However, the space between the smoke isolation chamber and the fixed section of the furnace mouth of the vaporization and cooling flue is typically filled with refractory castables. This poor sealing performance makes it difficult to completely seal the smoke isolation chamber from the converter flue gas. Consequently, a small amount of converter flue gas can penetrate the refractory material and spread to the upper platform, causing environmental pollution and affecting the health of operators on the upper platform. Utility Model Content

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present utility model is to provide a flue gas sealing structure and a converter steelmaking waste heat boiler system, which is used to solve the problems in the prior art that there is an installation gap between the upper platform set on the vaporization cooling flue and the fixed section of the flue at the furnace mouth of the vaporization cooling flue, and refractory materials are usually used to fill the space between the smoke isolation chamber and the fixed section of the flue at the furnace mouth of the vaporization cooling flue. The sealing effect of the refractory materials is poor, which causes environmental pollution and affects the health of the operator on the upper platform.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a smoke sealing structure, comprising:

[0006] A flue, wherein the flue is provided with a sealing bottom plate protruding from the outer wall of the flue in the radial direction of the flue, the sealing bottom plate being annular and arranged around the flue;

[0007] An upper platform is provided with a mounting hole, the flue is passed through the mounting hole, and a mounting gap is provided between a hole wall of the mounting hole and an outer wall of the flue;

[0008] A transverse flexible seal is annular and surrounds the flue. There is a gap between the inner wall of the transverse flexible seal and the outer wall of the flue. The transverse flexible seal is arranged corresponding to the sealing bottom plate. The transverse flexible seal is respectively sealed with the inner wall of the mounting hole and the sealing bottom plate. The transverse flexible seal and the sealing bottom plate seal the mounting gap.

[0009] Optionally, the transverse flexible plug is a flexible sleeve, and along the axial direction of the flue, one end of the flexible sleeve is connected to the upper platform, and the other end of the flexible sleeve is connected to the sealing bottom plate.

[0010] Optionally, the axial direction of the sleeve-shaped transverse flexible seal coincides with the axial direction of the flue.

[0011] Optionally, the flexible sleeve is a long strip of sealing band that is enclosed along the longitudinal direction of the sealing band around the axial direction of the flue, and the thickness of the sealing band is 2 mm.

[0012] Optionally, along the axial direction of the flue, the flue has an inlet end for smoke to enter and an outlet end for smoke to exhaust, and the sealing bottom plate is arranged on a side of the upper platform close to the inlet end of the flue.

[0013] Optionally, along the axial direction of the flue, the height of the end of the transverse flexible plug away from the entrance end exceeds the height of the upper platform.

[0014] Optionally, along the axial direction of the flue, a height difference between an end of the transverse flexible plug away from the entrance end and the upper platform is 50 mm.

[0015] Optionally, along the axial direction of the flue, the distance between the sealing bottom plate and the upper platform is 100 mm.

[0016] Optionally, the thickness of the sealing bottom plate is 20 mm.

[0017] The utility model provides a converter steelmaking waste heat boiler system, comprising the above-mentioned flue gas sealing structure.

[0018] As described above, the flue gas sealing structure and converter steelmaking waste heat boiler system of the present invention have the following beneficial effects:

[0019] By arranging a sealing bottom plate in the flue, one end of the transverse flexible seal is connected to the upper platform along the axial direction of the flue, and the other end of the transverse flexible seal is connected to the sealing bottom plate. In this way, the gap between the sealing bottom plate and the upper platform can be sealed by the transverse flexible seal, so as to prevent smoke from rising to the upper part of the upper platform through the installation gap, thereby ensuring the isolation of smoke at the installation gap. The structure is easy to install and can avoid damage to the outer wall of the flue during on-site assembly. At the same time, the transverse flexible seal has the function of absorbing stress, and can reduce the stress pulling on the flue under extreme conditions. While ensuring the safety of the flue during use, it improves the overall applicability and industrial use value of the flue. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of the fixed section flue of the furnace mouth of the converter steelmaking waste heat boiler system in the prior art.

[0021] Figure 2 This is a structural schematic diagram of the fixed section flue of the furnace mouth according to an embodiment of the present utility model.

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0023] Explanation of the markings: 1. Upper platform; 2. Smoke isolation chamber steel plate; 3. Refractory castable; 4. Furnace mouth fixed section flue; 5. Horizontal flexible plugging. DETAILED DESCRIPTION

[0024] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0025] See also Figures 1 to 3 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of this utility model. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by this utility model without affecting the efficacy and purpose that can be achieved by this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this utility model without substantially changing the technical content.

[0026] In order to describe the present invention in detail, the prior art background of the present application is first described. Figure 1As shown, when designing some flues, such as the flue 4 of the furnace mouth fixed section of the converter steelmaking waste heat boiler system, an installation gap needs to be reserved between the upper platform 1 and the outer wall of the flue 4 of the furnace mouth fixed section, so that the upper platform 1 can be set on the flue 4 of the furnace mouth fixed section. Since a smoke isolation chamber is provided at the lower part of the flue 4 of the furnace mouth fixed section, the upper platform 1 is set on the smoke isolation chamber steel plate 2, and the space between the smoke isolation chamber steel plate 2 and the outer wall of the flue 4 of the furnace mouth fixed section is filled with refractory calcined material 3. The sealing performance of the refractory calcined material 3 is poor, and there is smoke in the smoke isolation chamber. The smoke in the smoke isolation chamber can easily pass through the refractory calcined material 3 and the installation gap to enter the upper part of the upper platform 1, polluting the environment and the operator's work area, affecting the operator's health. Moreover, if operations are performed directly on the outer wall of the flue during on-site assembly, the outer wall of the flue can be easily damaged, leaving a safety hazard.

[0027] Next, a flue gas sealing structure and a converter steelmaking waste heat boiler system of the present invention are specifically described:

[0028] Please combine Figure 2 and Figure 3 As shown, the utility model provides a flue gas sealing structure, including a flue, an upper platform 1 and a transverse flexible plug 5. The flue is provided with a sealing bottom plate protruding from the outer wall of the flue along the radial direction of the flue, and the sealing bottom plate is annular and arranged around the flue; a mounting hole is opened on the upper platform 1, the flue is passed through the mounting hole, and there is a mounting gap between the hole wall of the mounting hole and the outer wall of the flue; the transverse flexible plug 5 is annular and surrounds the flue, and there is a gap between the inner wall of the transverse flexible plug 5 and the outer wall of the flue, the transverse flexible plug 5 is arranged corresponding to the sealing bottom plate, and the transverse flexible plug 5 is respectively sealed with the inner wall of the mounting hole and the sealing bottom plate, and the transverse flexible plug 5 and the sealing bottom plate block the mounting gap. The gap between the bottom plate and the upper platform 1 is sealed by the transverse flexible plug 5 to prevent smoke from rising to the upper part of the upper platform 1 through the installation gap, thereby ensuring the isolation of smoke at the installation gap. The structure is easy to install and can avoid damage to the outer wall of the flue during on-site assembly. At the same time, the transverse flexible plug 5 has the function of absorbing stress. In extreme cases, the transverse flexible plug 5 absorbs stress and reduces the stress pulling on the flue. While ensuring the safety of the flue during use, the overall applicability and industrial use value of the flue are improved.

[0029] In this embodiment, the flue is the fixed section flue 4 of the furnace mouth of the waste heat boiler system. To facilitate the installation of the upper platform 1 on the fixed section flue 4, an installation gap must be left between the upper platform 1 installed on the flue and the outer wall of the fixed section flue 4. The fixed section flue 4 is provided with multiple coolant circulation pipes for cooling high-temperature flue gas. The outer wall of the fixed section flue 4 cannot be directly welded to the upper platform. Direct welding is prone to leaking the coolant circulation pipes, leaving a safety hazard. By providing a sealing base and providing a transverse flexible seal 5 in the gap between the sealing base and the upper platform 1, the flue gas in the smoke isolation chamber can be effectively prevented from entering the upper part of the upper platform 1 through the installation gap between the outer wall of the fixed section flue 4 and the upper platform 1. By pre-setting a sealing base on the outer wall of the flue, the transverse flexible seal 5 is welded to the sealing base, which is convenient and does not require on-site welding of the outer wall of the furnace mouth flue 4, does not create safety hazards, and is easy to assemble. It should be noted that the side of the upper platform 1 close to the ground is the lower part, and the side of the upper platform 1 away from the ground is the upper part. The sealing bottom plate is welded to the flue 4 of the furnace mouth fixed section by a special welding method.

[0030] Among them, the transverse flexible plug 5 is a flexible sleeve. Along the axial direction of the flue, one end of the sleeve-shaped flexible sleeve is connected to the upper platform, and the other end of the flexible sleeve is connected to the sealing bottom plate. When the flexible sleeve is subjected to stress pulling, the stress can be quickly evenly distributed, thereby improving the stress tolerance of the transverse flexible plug 5. In this embodiment, the flexible sleeve is a long strip of sealing tape that is enclosed along the length direction of the sealing tape around the axial direction of the flue, and the thickness of the sealing tape is 2 mm. The flexible sleeve is formed by enclosing the sealing tape, which is convenient for installation, and the two ends of the sealing tape are connected by welding. In this embodiment, the sealing tape is made of steel that is easy to weld. The 2 mm thick steel has good flexibility at high temperatures and can better absorb thermal expansion. In extreme cases, the thin steel sleeve can be broken to ensure that the flue is not damaged and avoid safety accidents. In some embodiments, the sealing tape has multiple protrusions and depressions extending along its length. Each protrusion and depression is arranged sequentially across its width, with alternating intervals between the protrusions and depressions. This sealing tape exhibits good flexibility and stress absorption along its width. The material of the transverse flexible seal 5 can be adjusted based on actual usage requirements.

[0031] Specifically, the axial direction of the flexible sleeve coincides with the axial direction of the flue. Since the radial distance between the transverse flexible seal 5 and the flue is the same, the ability of the transverse flexible seal 5 to evenly distribute the stress of the flue can be improved, and the ability of the transverse flexible seal 5 to withstand stress can be improved, thereby improving the stability of the overall equipment operation and reducing the cost of maintenance and overhaul.

[0032] Among them, along the axial direction of the flue, the flue has an inlet end for the flue gas to enter and an outlet end for the flue gas to be discharged, and the sealing bottom plate is arranged on the side of the upper platform 1 close to the inlet end of the flue. In this embodiment, due to the increase in the radial length of the flue 4 of the furnace mouth fixed section on the upper part of the upper platform 1, the installation space on the upper part of the upper platform 1 is limited. At the same time, due to the spacing between the outer wall of the flue 4 of the furnace mouth fixed section and the smoke isolation chamber steel plate 2, the smoke isolation chamber steel plate 2, the outer wall of the flue 4 of the furnace mouth fixed section, the sealing bottom plate and the transverse flexible plugging 5 need to be sprayed with refractory castables in the cavity formed by them after assembly to form a complete seal for the flue gas. Therefore, the sealing bottom plate is arranged on the side of the upper platform 1 close to the inlet end of the flue, which can provide a suitable working space for spraying refractory castables. In some embodiments, the sealing bottom plate is arranged on the side of the upper platform 1 close to the outlet end of the flue. The relative position between the sealing bottom plate and the upper platform 1 can be adjusted according to actual needs.

[0033] In detail, along the axial direction of the flue, the height of the end of the transverse flexible seal 5 away from the inlet end exceeds the height of the upper platform 1, and the height difference is 50 mm to ensure that sealing can be performed within the equipment installation error range.

[0034] The thickness of the sealing bottom plate is 20 mm, which not only plays a sealing role but also increases the rigidity of the flue.

[0035] The utility model also provides a converter steelmaking waste heat boiler system, comprising the flue gas sealing structure as described above.

[0036] To sum up, by arranging a sealing bottom plate in the flue, one end of the transverse flexible seal 5 is connected to the upper platform 1 along the axial direction of the flue, and the other end of the transverse flexible seal 5 is connected to the sealing bottom plate. In this way, the gap between the sealing bottom plate and the upper platform 1 can be sealed by the transverse flexible seal 5 to prevent the smoke from rising to the upper part of the upper platform 1 through the installation gap, thereby ensuring the isolation of the smoke at the installation gap. At the same time, the transverse flexible seal 5 has the function of absorbing stress. In extreme cases, the stress is absorbed by the transverse flexible seal 5, which can reduce the stress pulling on the flue, thereby ensuring the safety of the flue during use and improving the overall applicability and industrial use value of the flue.

[0037] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A smoke sealing structure, characterized in that: include: A flue, wherein the flue is provided with a sealing bottom plate protruding from the outer wall of the flue in the radial direction of the flue, the sealing bottom plate being annular and arranged around the flue; An upper platform is provided with a mounting hole, the flue is passed through the mounting hole, and a mounting gap is provided between a hole wall of the mounting hole and an outer wall of the flue; A transverse flexible seal is annular and surrounds the flue. There is a gap between the inner wall of the transverse flexible seal and the outer wall of the flue. The transverse flexible seal is arranged corresponding to the sealing bottom plate. The transverse flexible seal is respectively sealed with the inner wall of the mounting hole and the sealing bottom plate. The transverse flexible seal and the sealing bottom plate seal the mounting gap.

2. The smoke sealing structure according to claim 1, characterized in that: The transverse flexible plugging is a flexible sleeve. Along the axial direction of the flue, one end of the transverse flexible plugging of the flexible sleeve is connected to the upper platform, and the other end of the flexible sleeve is connected to the sealing bottom plate.

3. The smoke sealing structure according to claim 2, characterized in that: The axial direction of the flexible sleeve coincides with the axial direction of the flue.

4. The smoke sealing structure according to claim 2, characterized in that: The flexible sleeve is a long strip of sealing band that is enclosed along the length direction of the sealing band around the axial direction of the flue, and the thickness of the sealing band is 2 mm.

5. The smoke sealing structure according to claim 1, characterized in that: Along the axial direction of the flue, the flue has an inlet end for flue gas to enter and an outlet end for flue gas to be discharged, and the sealing bottom plate is arranged on the side of the upper platform close to the inlet end of the flue.

6. The smoke sealing structure according to claim 5, characterized in that: Along the axial direction of the flue, the height of the end of the transverse flexible plug away from the inlet end exceeds the height of the upper platform.

7. The smoke sealing structure according to claim 5, characterized in that: Along the axial direction of the flue, the height difference between the end of the transverse flexible plug away from the entrance end and the upper platform is 50 mm.

8. The smoke sealing structure according to claim 3, characterized in that: Along the axial direction of the flue, the distance between the sealing bottom plate and the upper platform is 100 mm.

9. The smoke sealing structure according to claim 1, characterized in that: The thickness of the sealing bottom plate is 20 mm.

10. A converter steelmaking waste heat boiler system, characterized in that: The invention comprises a smoke sealing structure as described in any one of claims 1 to 9.

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