Boiler sealing cover for isolating high-temperature sulfur-containing flue gas

Abstract

The utility model relates to a boiler seal cover for isolating high-temperature sulfur-containing flue gas, which comprises a metal protective cover, a positioning block, a suspender, a nut, a seal cover shell, a seal cover top cover, a stamping hole, a purging assembly and a heat tracing assembly, a first cavity is arranged in the metal protective cover, the positioning block is arranged in the first cavity, and the suspender is arranged in the first cavity. The positioning block is arranged on the metal protective cover, the hanging rod penetrates through the positioning block, the nut is arranged at the end, penetrating through the positioning block, of the hanging rod, the sealing cover shell is arranged on the outer edge of the periphery of the metal protective cover, the sealing cover top cover is arranged on the top of the sealing cover shell, and the stamping hole is formed in the sealing cover top cover. The purging assembly is arranged on the sealing cover top cover through the stamping hole, and the heat tracing assembly is arranged on the upper surface of the sealing cover top cover. The purging assembly and the heat tracing assembly are matched with each other, so that the protection performance of the boiler sealing cover is improved.

Description

Technical Field

[0001] The utility model relates to a boiler seal cover for isolating high-temperature sulfur-containing flue gas. Background Art

[0002] Most of the boiler seal covers are used in the waste heat recovery system. They are mainly installed on the top of the boiler to block the high-temperature flue gas overflowing locally from the top of the boiler. However, with the continuous increase in the sulfur content in the high-temperature flue gas, especially the content of SO3 in the high-temperature flue gas, and the boiler seal cover being located at the top of the boiler equipment, its surface temperature is greatly affected by the external environment, making its surface temperature too close to or lower than the dew point temperature during normal operation; in addition, during the shutdown and cooling period of the equipment, the corrosive flue gas accumulated in the cavity of the seal cover cannot be discharged normally. Therefore, the structure of the boiler seal cover in the prior art still has the following deficiencies: 1. The metal boiler seal cover is not resistant to corrosive flue gas. Especially, flue gas is likely to accumulate in the cavity of the superheater hanger rod, and when the external environmental temperature drops, acidic media are extremely likely to condense on the inner wall of the metal seal cover, causing corrosion perforation; 2. The metal outer wall temperature of the boiler seal cover is relatively low, and the thermal insulation measures are insufficient, making it prone to dew point corrosion. Especially during the shutdown period, when the temperature and pressure suddenly drop, flue gas will accumulate in the seal cavity and condense, resulting in particularly serious corrosion. Summary of the Utility Model

[0003] The purpose of this part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and the title of the utility model of this application, to avoid obscuring the purpose of this part, the abstract, and the title of the utility model. However, such simplifications or omissions cannot be used to limit the scope of the utility model.

[0004] The technical problem to be solved by the utility model is how to improve the protection performance of the boiler seal cover.

[0005] To solve the above technical problems, the present utility model provides the following technical solution: A boiler seal cover for isolating high-temperature sulfur-containing flue gas, comprising a metal protective cover, positioning blocks, suspension rods, nuts, a seal cover housing, a seal cover top cover, stamping holes, a purging assembly, and a heat tracing assembly. A first cavity is provided inside the metal protective cover. The positioning blocks are arranged in the first cavity for isolating sulfur-containing flue gas. A second cavity is formed between the positioning blocks and the bottom of the metal protective cover. The suspension rods penetrate through the positioning blocks, and nuts are arranged at one end of the suspension rods where they penetrate through the positioning blocks. The seal cover housing is arranged along the outer edges of the four sides of the metal protective cover. The seal cover top cover is arranged on the top of the seal cover housing. A third cavity is formed between the seal cover housing and the seal cover top cover. The stamping holes are opened on the seal cover top cover. The purging assembly is arranged on the seal cover top cover through the stamping holes for purging nitrogen. The heat tracing assembly is arranged on the upper surface of the seal cover top cover for increasing the temperature of the outer surface of the seal cover.

[0006] As a preferred embodiment of the boiler seal cover for isolating high-temperature sulfur-containing flue gas of the present utility model, the following is provided: The purging assembly includes an air pipe, a gate valve, a pressure gauge, and a pressure gauge root valve. One end of the air pipe is arranged at the stamping hole of the seal cover top cover. The air pipe is connected to the third cavity through the stamping hole and is connected to external nitrogen at the other end to transport external nitrogen into the third cavity to achieve the purpose of isolating high-temperature sulfur-containing flue gas. The gate valve is arranged on the air pipe for controlling the flow rate of nitrogen. The pressure gauge is arranged on the air pipe. The pressure gauge root valve is arranged at the connection between the pressure gauge and the air pipe to measure the pressure of nitrogen in the air pipe to ensure safety.

[0007] As a preferred embodiment of the boiler seal cover for isolating high-temperature sulfur-containing flue gas of the present utility model, the following is provided: The heat tracing assembly includes a mounting cover and heat tracing copper tubes. The mounting cover is arranged on the seal cover top cover. The heat tracing copper tubes are arranged inside the mounting cover. The heat tracing copper tubes are in mutual contact with the upper surface of the seal cover top cover. The heat tracing copper tubes are used to increase the temperature of the outer surface of the seal cover, reduce the temperature difference between the inside and outside of the seal cover, and avoid the phenomenon of flue gas condensation corrosion on the inner surface of the seal cover.

[0008] As a preferred embodiment of the boiler seal cover for isolating high-temperature sulfur-containing flue gas of the present utility model, the following is provided: The purging assembly further includes a nitrogen heater arranged on the air pipe to heat the nitrogen in the air pipe and improve the heat preservation effect of the seal cover.

[0009] As a preferred embodiment of the boiler seal cover for isolating high-temperature sulfur-containing flue gas of the present utility model, the following is provided: A gasket is arranged between the nut and the positioning block. The gasket has a certain elasticity. The resilience of the gasket can provide a certain pre-tightening force to prevent the nut from loosening.

[0010] As a preferred solution of the boiler seal cover for isolating high-temperature sulfur-containing flue gas of the present utility model, wherein: the third cavity is filled with a heat-insulating lining to reduce the heat loss inside the metal protective cover and avoid dew point corrosion on the inner surface of the metal protective cover.

[0011] Beneficial effects:

[0012] 1. Through the mutual cooperation between the purging assembly and the tracing assembly, the protection performance of the boiler seal cover is improved;

[0013] 2. By filling the inner cavity of the seal cover with nitrogen to isolate the corrosive flue gas throughout the process, not only the problem of the accumulation of corrosive flue gas during start-up and shutdown is solved, but also the problems of frequent leakage during the production process, difficult plugging of leaks at high temperatures during construction, and on-site environmental protection odor are solved, reducing production costs and production stoppage losses, and having important economic and environmental benefits;

[0014] 3. Through the cooperation between the positioning block, the metal protective cover, the seal cover housing and the heat-insulating lining, a four-layer protection effect on the top of the boiler is achieved. Description of the drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0016] Figure 1 It is a schematic diagram of the overall structure of the boiler seal cover for isolating high-temperature sulfur-containing flue gas.

[0017] Figure 2 It is a partial cross-sectional view of the boiler seal cover for isolating high-temperature sulfur-containing flue gas.

[0018] Figure 3 It is a schematic diagram of the position structure of the purging assembly of the boiler seal cover for isolating high-temperature sulfur-containing flue gas.

[0019] Figure 4 It is a schematic diagram of the structure of the tracing assembly of the boiler seal cover for isolating high-temperature sulfur-containing flue gas.

[0020] In the figure: 1, metal protective cover; 2, positioning block; 3, suspension rod; 4, nut; 5, seal housing; 6, seal top cover; 7, stamping hole; 8, purging assembly; 81, gas pipe; 82, gate valve; 83, pressure gauge; 84, pressure gauge root valve; 85, nitrogen heater; 9, tracing assembly; 91, mounting cover; 92, tracing copper pipe; 10, first cavity; 11, second cavity; 12, third cavity; 13, gasket; 14, heat insulation lining. Detailed implementation manners

[0021] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description of the specific implementation manners of the present utility model will be given in conjunction with the accompanying drawings of the specification.

[0022] In the following description, many specific details are set forth to facilitate a thorough understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0023] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that may be included in at least one implementation manner of the present utility model. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it a separate or alternative embodiment that mutually excludes other embodiments.

[0024] Embodiment

[0025] Referring to Figures 1 to 4 , this embodiment provides a boiler seal cover for isolating high-temperature sulfur-containing flue gas, including a metal protective cover 1, a positioning block 2, a suspension rod 3, a nut 4, a seal housing 5, a seal top cover 6, a stamping hole 7, a purging assembly 8 and a tracing assembly 9. A first cavity 10 is arranged inside the metal protective cover 1. The positioning block 2 is arranged in the first cavity 10 for isolating sulfur-containing flue gas. A second cavity 11 is formed between the positioning block 2 and the bottom of the metal protective cover 1. The suspension rod 3 penetrates through the positioning block 2, and the nut 4 is arranged at one end of the suspension rod 3 penetrating through the positioning block 2. The seal housing 5 is arranged on the outer edge around the metal protective cover 1. The seal top cover 6 is arranged on the top of the seal housing 5. A third cavity 12 is formed between the seal housing 5 and the seal top cover 6. The stamping hole 7 is opened on the seal top cover 6. The purging assembly 8 is arranged on the seal top cover 6 through the stamping hole 7 for purging nitrogen. The tracing assembly 9 is arranged on the upper surface of the seal top cover 6 for increasing the temperature of the outer surface of the seal cover.

[0026] The metal protective cover 1 serves as the installation foundation of the sealing cover and is installed on the top of the boiler. The cross-section of the inner cavity of the metal protective cover 1 is in a "T" shape. The upper cavity inside the metal protective cover 1 is the first cavity 10, and a positioning block 2 is installed in the first cavity 10. A second cavity 11 is formed between the positioning block 2 and the lower cavity inside the metal protective cover 1. A hole is opened in the center of the positioning block 2. One end of the suspension rod 3 welded with the heat exchange tube bundle is passed through the hole of the positioning block 2, and the suspension rod 3 is fixedly installed on the positioning block 2 with a nut 4, so that the suspension rod 3 is connected to the "T" plane of the inner cavity of the metal protective cover 1 through the positioning block 2, increasing the contact area and improving the overall stability of the suspension rod 3. It should be noted that the positioning block 2 is connected to the inner wall of the first cavity 10 inside the metal protective cover 1 through a graphite-reinforced gasket 13 and is connected and pressed through a static sealing surface to isolate most of the flue gas and prevent the flue gas entering the second cavity 11 from directly entering the first cavity 10. A small amount of flue gas enters the first cavity 10 through the gap between the suspension rod 3 and the positioning block 2. A sealing cover housing 5 is welded to the outer edge of the bottom of the metal protective cover 1, and a sealing cover top cover 6 is welded to the top of the sealing cover housing 5. A closed third cavity 12 is formed between the sealing cover housing 5 and the sealing cover top cover 6. A stamping hole 7 is opened at the outer edge of the upper surface of the sealing cover top cover 6, and the stamping hole 7 is communicated with the third cavity 12. A purging assembly 8 is installed at the stamping hole 7 on the sealing cover top cover 6. The purging assembly 8 can transport external nitrogen to the third cavity 12 through the stamping hole 7 to realize nitrogen purging of the sealing cover, filling the entire cavity of the sealing cover with nitrogen to achieve the purpose of isolating high-temperature sulfur-containing flue gas, improving the protection performance of the boiler sealing cover. A tracing assembly 9 is also installed at the center of the upper surface of the sealing cover top cover 6 to increase the temperature of the outer surface of the sealing cover, reduce the temperature difference between the inside and outside of the sealing cover, and avoid the phenomenon of flue gas condensation corrosion on the inner surface of the sealing cover, further improving the protection performance of the boiler sealing cover.

[0027] Specifically, the purging assembly 8 includes an air pipe 81, a gate valve 82, a pressure gauge 83 and a pressure gauge root valve 84. One end of the air pipe 81 is arranged at the stamping hole 7 of the sealing cover top cover 6. The air pipe 81 is communicated with the third cavity 12 through the stamping hole 7. The other end of the air pipe 81 is communicated with external nitrogen. The gate valve 82 is arranged on the air pipe 81. The pressure gauge 83 is arranged on the air pipe 81. The pressure gauge root valve 84 is arranged at the connection between the pressure gauge 83 and the air pipe 81.

[0028] The purging assembly 8 mainly consists of an air pipe 81, a gate valve 82, a pressure gauge 83, and a pressure gauge root valve 84. One end of the air pipe 81 is connected to the stamping hole 7 on the top cover 6 of the sealing cover. The stamping hole 7 is communicated with the third cavity 12. The other end of the air pipe 81 is connected to external nitrogen gas to deliver the external nitrogen gas into the third cavity 12 through the air pipe 81, achieving the purpose of isolating high-temperature sulfur-containing flue gas. A gate valve 82 is installed on the air pipe 81 to control the flow rate of nitrogen gas in the air pipe 81. A pressure gauge 83 is also installed on the air pipe 81, and a pressure gauge root valve 84 is installed at the connection between the pressure gauge 83 and the air pipe 81 to facilitate measuring the pressure of nitrogen gas in the air pipe 81 and ensure safety.

[0029] Specifically, the tracing assembly 9 includes a mounting cover 91 and a tracing copper pipe 92. The mounting cover 91 is arranged on the top cover 6 of the sealing cover, and the tracing copper pipe 92 is arranged inside the mounting cover 91. The tracing copper pipe 92 is mutually attached to the upper surface of the top cover 6 of the sealing cover.

[0030] The tracing assembly 9 mainly consists of a mounting cover 91 and a tracing copper pipe 92. The tracing copper pipe 92 is fixedly installed inside the mounting cover 91. The mounting cover 91 with the tracing copper pipe 92 installed is centrally mounted on the upper surface of the top cover 6 of the sealing cover through screws, and the tracing copper pipe 92 is connected to an external power supply. After installation, the tracing copper pipe 92 is mutually attached to the upper surface of the top cover 6 of the sealing cover, enabling the tracing copper pipe 92 to better heat the outer surface of the sealing cover, thereby using the tracing copper pipe 92 to increase the temperature of the outer surface of the sealing cover, reduce the temperature difference between the inside and outside of the sealing cover, and avoid the phenomenon of flue gas condensation corrosion on the inner surface of the sealing cover.

[0031] Furthermore, the purging assembly 8 further includes a nitrogen gas heater 85, which is arranged on the air pipe 81.

[0032] In this embodiment, by further installing a nitrogen gas heater 85 on the air pipe 81, the nitrogen gas in the air pipe 81 is heated by the nitrogen gas heater 85 to improve the heat preservation effect of the sealing cover.

[0033] Furthermore, a gasket 13 is arranged between the nut 4 and the positioning block 2.

[0034] In this embodiment, by adding a gasket 13 between the nut 4 and the positioning block 2, the gasket 13 has a certain elasticity, and a certain pre-tightening force can be provided by the resilience of the gasket 13 to prevent the nut 4 from loosening.

[0035] Furthermore, the third cavity 12 is filled with a heat-insulating lining 14.

[0036] In this embodiment, a heat-insulating lining 14 is filled in the third cavity 12 to reduce the heat loss inside the metal protective cover 1, further improving the heat preservation effect of the sealing cover, thereby avoiding dew point corrosion on the inner surface of the metal protective cover 1. In addition, the heat-insulating lining 14 also protects the external metal from high-temperature radiation damage, blocks the leakage of nitrogen, and while saving nitrogen, also keeps the third cavity 12 at a slightly positive pressure to prevent high-temperature sulfur-containing flue gas from invading the third cavity 12.

[0037] During operation, the high-temperature sulfur-containing flue gas in the boiler leaks from the top of the boiler and enters the second cavity 11. The positioning block 2 will isolate most of the flue gas to prevent the flue gas entering the second cavity 11 from directly entering the first cavity 10. A small amount of flue gas enters the first cavity 10 through the gap between the suspension rod 3 and the positioning block 2. The flue gas will continuously accumulate in the first cavity 10. During this process, the gate valve 82 is opened, and external nitrogen is transported into the third cavity 12 through the gas pipe 81. The nitrogen heater 85 on the gas pipe 81 can heat the nitrogen in the gas pipe 81. At the same time, the heat tracing copper tube 92 on the sealing cover top cover 6 will continuously heat the outer surface of the sealing cover to reduce the temperature difference between the inside and outside of the sealing cover and avoid flue gas condensation corrosion on the inner surface of the sealing cover. If the inner wall of the metal protective cover 1 corrodes and perforates, the nitrogen in the first cavity 10 will directly enter the first cavity 10 inside the metal protective cover 1, then enter the second cavity 11 through the gap between the suspension rod 3 and the positioning block, and then enter the boiler interior from the second cavity 11 to purge the high-temperature sulfur-containing flue gas inside the sealing cover.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A boiler sealing cover for isolating high-temperature sulfur-containing flue gas, characterized in that: The invention comprises a metal protective cover (1), a positioning block (2), a suspension rod (3), a nut (4), a sealing cover shell (5), a sealing cover top cover (6), a punching hole (7), a purge assembly (8) and a heating assembly (9), wherein a first cavity (10) is arranged inside the metal protective cover (1), the positioning block (2) is arranged in the first cavity (10) for isolating sulfur-containing flue gas, a second cavity (11) is formed between the positioning block (2) and the bottom of the metal protective cover (1), the suspension rod (3) passes through the positioning block (2), and the nut (4) is arranged on the suspension rod (3) passing through the positioning block. (2), the sealing cover shell (5) is arranged on the outer edges of the four sides of the metal protective cover (1), the sealing cover top cover (6) is arranged on the top of the sealing cover shell (5), a third cavity (12) is formed between the sealing cover shell (5) and the sealing cover top cover (6), the punching hole (7) is opened on the sealing cover top cover (6), the purge component (8) is arranged on the sealing cover top cover (6) through the punching hole (7) for purging nitrogen, and the heating component (9) is arranged on the upper surface of the sealing cover top cover (6) for increasing the temperature of the outer surface of the sealing cover.

2. The boiler sealing cover for isolating high-temperature sulfur-containing flue gas according to claim 1, characterized in that: The purge assembly (8) comprises an air pipe (81), a gate valve (82), a pressure gauge (83) and a pressure gauge root valve (84); one end of the air pipe (81) is arranged at a punching hole (7) of the sealing cover top cover (6); the air pipe (81) is connected to the third cavity (12) through the punching hole (7); the other end of the air pipe (81) is connected to external nitrogen; the gate valve (82) is arranged on the air pipe (81); the pressure gauge (83) is arranged on the air pipe (81); and the pressure gauge root valve (84) is arranged at the connection between the pressure gauge (83) and the air pipe (81).

3. The boiler sealing cover for isolating high-temperature sulfur-containing flue gas according to claim 1, characterized in that: The heating assembly (9) comprises a mounting cover (91) and a heating copper pipe (92); the mounting cover (91) is arranged on the sealing cover top cover (6); the heating copper pipe (92) is arranged in the mounting cover (91); the heating copper pipe (92) and the upper surface of the sealing cover top cover (6) are in contact with each other.

4. The boiler sealing cover for isolating high-temperature sulfur-containing flue gas according to claim 2, characterized in that: The purge assembly (8) further comprises a nitrogen heater (85), and the nitrogen heater (85) is arranged on the air pipe (81).

5. The boiler sealing cover for isolating high-temperature sulfur-containing flue gas according to claim 1, characterized in that: A gasket (13) is provided between the nut (4) and the positioning block (2).

6. The boiler sealing cover for isolating high-temperature sulfur-containing flue gas according to claim 1, characterized in that: The third cavity (12) is filled with a heat insulation lining (14).

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