Leak-proof device for flue gas desulfurization system of thermal power plant

Abstract

The utility model provides a thermal power plant flue gas desulfurization system leakproof device, relates to leakproof device field, include: flue pipe, cleaning subassembly and desulfurizing tower, the connecting end of flue pipe is equipped with outer flange, and the inside end face of outer flange is equipped with outer seal ring, the outer wall of desulfurizing tower is equipped with air inlet hole, and the air inlet hole is equipped with outer seal ring. An air inlet hole is formed in the outer side of the desulfurization tower, an inner flange is fixed to the periphery of an inner side end opening of the air inlet hole, an inner sealing ring is arranged on the outer side end face of the inner flange, a flow guide groove is formed in the lower side of the air inlet hole, the lower end of the flow guide groove is connected with a temporary storage cavity, and the outer side of the temporary storage cavity is connected with a discharge pipe; the lower side of the liquid storage tank is connected with a conveying pipe through a water pump, and the lower end of the conveying pipe is connected with a water spraying assembly which is located in the air inlet. According to the utility model, the problems of short service life and poor sealing and leakage-proof effects caused by rapid corrosion of a sealing element in the existing flue gas desulfurization leakage-proof device are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-leakage devices, and particularly relates to an anti-leakage device for a flue gas desulfurization system in a thermal power plant. Background Technique

[0002] In a flue gas desulfurization system of a thermal power plant, it is necessary to connect the flue gas with a desulfurization tower through a flue duct, and good sealing needs to be done at the connection. After retrieval, the prior art (publication number: CN211358242U), which records "a flue gas desulfurization anti-leakage device, a first flange is arranged at the flue outlet, the bottom of the first flange is connected with a blind plate, the bottom of the blind plate is connected with a second flange, a corrugated compensator is arranged at the bottom of the second flange, and the corrugated compensator is connected with the air inlet of a booster fan in a standby desulfurization device through a third flange; raised elements are respectively arranged on the upper surface and the lower surface of the blind plate; support devices are arranged on both sides of the periphery of the corrugated compensator; the beneficial effect of the utility model lies in that physical sealing is carried out through the blind plate to eliminate the risk of flue gas leakage; the support device can effectively prevent the corrugated compensator from being damaged and leaking gas caused by excessive movement of the expansion joint when the air flow is too large; raised elements are arranged at the bottom and the top of the blind plate to increase the compressive capacity of the blind plate itself, and at the same time, the design of local protrusions saves steel and solves the problems of too thick blind plate, difficult disassembly and influence on the sealing performance."

[0003] The existing flue gas desulfurization anti-leakage device only performs anti-leakage treatment between the flue and the booster fan, and the connection between the flue and the desulfurization tower body is generally a detachable connection. Therefore, the sealing member used after connection will be gradually corroded by the acidic substance formed after the condensation of sulfur dioxide during long-term use, and then lose the anti-leakage effect. At the same time, there is usually only a sealing member arranged on the outer side of the connection between the existing flue and the desulfurization tower, resulting in a poor sealing effect, and further resulting in a poor anti-leakage effect. Content of the Utility Model

[0004] In order to overcome the defects existing in the prior art, the utility model provides an anti-leakage device for a flue gas desulfurization system in a thermal power plant to solve the problems that the existing flue gas desulfurization anti-leakage device has a short service life due to the rapid corrosion of the sealing member and a poor sealing and anti-leakage effect at the same time.

[0005] To achieve the above object, a leakage prevention device for a flue gas desulfurization system in a thermal power plant is provided, including: a flue duct, a cleaning component, and a desulfurization tower. An outer flange is provided at the connecting end of the flue duct, and an outer sealing ring is provided on the inner end face of the outer flange. An air inlet hole is formed in the outer wall of the desulfurization tower, and an inner flange is fixed around the outer peripheral of the inner port of the air inlet hole. An inner sealing ring is provided on the outer end face of the inner flange. A diversion groove is formed below the air inlet hole, and the lower end of the diversion groove is connected to a buffer chamber. The outer side of the buffer chamber is connected to a discharge pipe. The cleaning component includes a liquid storage tank fixed on the outer wall of the desulfurization tower. The lower side of the liquid storage tank is connected to a delivery pipe through a water pump, and the lower end of the delivery pipe is connected to a water spraying component. The water spraying component is located in the air inlet hole.

[0006] Further, the outer flange is fixedly connected to the flue duct, and a threaded rod is connected between the outer flange and the inner flange. The threaded rod passes through the tower wall of the desulfurization tower and is fixedly connected to the inner flange. At the same time, the outer end of the threaded rod slides through the outer flange, and a locking nut is screwed on the outer end of the threaded rod.

[0007] Further, the diversion groove is funnel-shaped, the buffer chamber is rectangular in structure, the outer end of the discharge pipe extends to the outside of the desulfurization tower, and a valve is connected to the outer wall of the discharge pipe.

[0008] Further, a water replenishing hole is provided on the outer wall of the liquid storage tank, the water pump is provided at the bottom of the liquid storage tank, and the delivery pipe is inserted into the inner part of the tower wall of the desulfurization tower.

[0009] Further, the water spraying component includes a hollow disk, a connection hole is provided at the center point on the upper side of the hollow disk, and the connection hole is connected to the lower end of the delivery pipe.

[0010] Further, a buffer chamber is provided inside the hollow disk, the outer peripheral edge of the hollow disk is connected to a spray head, and the spray heads are connected in an annular matrix structure at the edge of the hollow disk.

[0011] The beneficial effects of the present utility model are as follows:

[0012] 1. By using the outer flange and the inner flange, the flue duct is fixedly connected through the threaded rod and the locking nut. Then, through the outer sealing ring and the inner sealing ring, a double sealing effect inside and outside the connected flue duct is achieved. At the same time, after the inner parts of the inner and outer sealing rings are compressed and consumed, the outer flange can be squeezed inward by the locking nut, so that the inner and outer sealing rings are further attached to the air inlet hole, achieving a good sealing and leakage prevention effect;

[0013] 2. By using the liquid storage tank, water pump, delivery pipe, and spraying component included in the cleaning component, the cleaning agent can be sprayed onto the inner end face of the sealing ring on both sides of the air inlet hole. As a result, the acidic substances formed by sulfur dioxide after condensation can be cleaned, causing them to separate from the sealing ring and preventing the sealing ring from being corroded. Then, through the diversion groove, buffer chamber, and discharge pipe, the waste liquid from the cleaning can be discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional structure view of an embodiment of the present invention.

[0015] Figure 2 For an embodiment of the present invention Figure 1 Schematic view of the structure at A in the figure.

[0016] Figure 3 It is a schematic cross-sectional structure view of the cleaning component of an embodiment of the present invention.

[0017] Figure 4 It is a schematic top cross-sectional structure view of the spraying component of an embodiment of the present invention.

[0018] In the figure: 1, flue gas pipe; 11, outer flange; 12, outer sealing ring; 13, inner flange; 14, inner sealing ring; 15, threaded rod; 16, locking nut; 2, cleaning component; 21, liquid storage tank; 22, water pump; 23, delivery pipe; 24, spraying component; 241, hollow disk; 242, connection hole; 243, buffer chamber; 244, nozzle; 3, desulfurization tower; 31, air inlet hole; 32, diversion groove; 33, buffer chamber; 34, discharge pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Refer to Figures 1 to 4As shown in the figure, the utility model provides a leakage prevention device for a flue gas desulfurization system in a thermal power plant, including: a flue duct 1, a cleaning component 2 and a desulfurization tower 3. The connecting end of the flue duct 1 is provided with an outer flange 11, and an outer sealing ring 12 is arranged on the inner end face of the outer flange 11. An air inlet hole 31 is opened on the outer wall of the desulfurization tower 3, and an inner flange 13 is fixed on the outer periphery of the inner port of the air inlet hole 31. An inner sealing ring 14 is arranged on the outer end face of the inner flange 13. The outer flange 11 is fixedly connected with the flue duct 1, and a threaded rod 15 is connected between the outer flange 11 and the inner flange 13. The threaded rod 15 penetrates through the tower wall of the desulfurization tower 3 and is fixedly connected with the inner flange 13. At the same time, the outer end of the threaded rod 15 slidably penetrates through the outer flange 11, and a locking nut 16 is screwed on the outer end of the threaded rod 15. A diversion groove 32 is opened below the air inlet hole 31, and the lower end of the diversion groove 32 is connected with a buffer cavity 33. The outer side of the buffer cavity 33 is connected with a discharge pipe 34. The cleaning component 2 includes a liquid storage tank 21 fixed on the outer wall of the desulfurization tower 3. The lower side of the liquid storage tank 21 is connected with a delivery pipe 23 through a water pump 22. The lower end of the delivery pipe 23 is connected with a water spraying component 24. At the same time, the water spraying component 24 is located in the air inlet hole 31.

[0020] In this embodiment, the two groups of flanges, the cleaning component 2 and the tower wall structure of the desulfurization tower 3 constitute the leakage prevention device for the flue gas desulfurization system in the thermal power plant involved in this application.

[0021] Among them, the desulfurization tower 3 is a commonly used device in the flue gas desulfurization system of a thermal power plant in the prior art. The internal structures of the desulfurization tower 3 involved in this application, including a spraying system, a demister and a gypsum water tank, etc., are not drawn.

[0022] Specifically, an outlet flue gas pipe is arranged near the upper end on the other side of the desulfurization tower 3, and the connection mode of the outlet flue gas pipe and the flue duct 1 is the same.

[0023] Specifically, the threaded rod 15 is slidably inserted into the tower wall of the desulfurization tower 3. During the tightening process of the locking nut 16, the outer flange 11 is moved towards the inner flange 13. At the same time, the inner flange 13 is moved towards the outer flange 11 under the locking tension of the locking nut 16, so as to achieve the double-layer sealing and leakage prevention effect on the air inlet hole 31.

[0024] Such as Figure 2 、 Figure 3 and Figure 4As shown, the diversion groove 32 is set in a funnel shape, and the buffer cavity 33 is set in a rectangular cavity structure. The outer end of the discharge pipe 34 extends to the outside of the desulfurization tower 3. At the same time, a valve is connected to the outer wall of the discharge pipe 34. A water replenishing hole is provided on the outer wall of the liquid storage tank 21, and the water pump 22 is arranged at the bottom of the liquid storage tank 21. The delivery pipe 23 is inserted into the inner part of the tower wall of the desulfurization tower 3. The water spraying assembly 24 includes a hollow disk 241. A connection hole 242 is opened at the center point on the upper side of the hollow disk 241, and the connection hole 242 is connected to the lower end of the delivery pipe 23. A buffer cavity 243 is arranged inside the hollow disk 241. The outer peripheral edge of the hollow disk 241 is connected with spray nozzles 244, and the spray nozzles 244 are connected to the edge of the hollow disk 241 in an annular matrix structure.

[0025] Specifically, a neutralizing cleaner for acidic substances is provided in the liquid storage tank 21. After the cleaner is sprayed outwards from the multiple spray nozzles 244, the seals on both sides of the inner hole wall of the air inlet hole 31 are cleaned, the corrosion effect is reduced, and the service life is prolonged.

[0026] During use, the flue gas pipe is fixedly connected by using the outer flange and the inner flange through the threaded rod and the locking nut. Then, through the outer seal ring and the inner seal ring, a double internal and external sealing effect is achieved for the connected flue gas pipe. At the same time, after a part of the inner sides of the inner and outer seal rings is compressed and consumed, the outer flange can be squeezed inwards by the locking nut, so that the inner and outer seal rings are further attached to the air inlet hole, achieving a better sealing and anti-leakage effect. By using the liquid storage tank, the water pump, the delivery pipe and the water spraying assembly included in the cleaning assembly, the cleaning agent is sprayed onto the inner end face of the seal ring on both sides of the air inlet hole, so that the acidic substances formed by the condensed sulfur dioxide can be cleaned, making them separated from the seal ring and avoiding the corrosion of the seal ring. Then, through the diversion groove, the buffer cavity and the discharge pipe, the waste liquid of the cleaning is discharged.

[0027] The anti-leakage device for the flue gas desulfurization system of the thermal power plant of the present utility model can effectively solve the problems that the existing flue gas desulfurization anti-leakage device has a short service life due to the rapid corrosion of the seal and a poor sealing and anti-leakage effect. On the basis of the existing technology of the anti-leakage device for the flue gas desulfurization system of the thermal power plant, the problem of short service life caused by the rapid corrosion of the seal is alleviated, and the sealing and anti-leakage effect is enhanced.

Claims

1. A flue gas desulfurization system anti-leakage device for thermal power plants, comprising: A flue gas pipe (1), a cleaning assembly (2) and a desulfurization tower (3), characterized in that: an outer flange (11) is provided at the connecting end of the flue gas pipe (1), and an outer sealing ring (12) is provided on the inner end face of the outer flange (11); an air inlet hole (31) is formed in the outer wall of the desulfurization tower (3), and an inner flange (13) is fixed to the outer periphery of the inner port of the air inlet hole (31), and an inner sealing ring (14) is provided on the outer end face of the inner flange (13); a diversion groove (32) is formed below the air inlet hole (31), the lower end of the diversion groove (32) is connected to a buffer cavity (33), and a discharge pipe (34) is connected to the outside of the buffer cavity (33); the cleaning assembly (2) includes a liquid storage tank (21) fixed to the outer wall of the desulfurization tower (3), a delivery pipe (23) is connected to the lower side of the liquid storage tank (21) through a water pump (22), the lower end of the delivery pipe (23) is connected to a water spraying assembly (24), and the water spraying assembly (24) is located in the air inlet hole (31).

2. The anti-leakage device for a flue gas desulfurization system in a thermal power plant according to claim 1, characterized in that, The outer flange (11) is fixedly connected to the flue gas pipe (1), a threaded rod (15) is connected between the outer flange (11) and the inner flange (13), the threaded rod (15) penetrates through the tower wall of the desulfurization tower (3) and is fixedly connected to the inner flange (13), the outer end of the threaded rod (15) slidably penetrates through the outer flange (11), and a locking nut (16) is screwed on the outer end of the threaded rod (15).

3. The anti-leakage device for a flue gas desulfurization system in a thermal power plant according to claim 1, characterized in that, The diversion groove (32) is in a funnel shape, the buffer cavity (33) is in a rectangular cavity structure, the outer end of the discharge pipe (34) extends to the outside of the desulfurization tower (3), and a valve is connected to the outer wall of the discharge pipe (34).

4. The anti-leakage device for a flue gas desulfurization system in a thermal power plant according to claim 1, characterized in that, A water replenishing hole is provided on the outer wall of the liquid storage tank (21), the water pump (22) is provided at the bottom of the liquid storage tank (21), and the delivery pipe (23) is inserted into the inner part of the tower wall of the desulfurization tower (3).

5. The anti-leakage device for a flue gas desulfurization system in a thermal power plant according to claim 1, wherein, The water spraying assembly (24) includes a hollow disc (241), a connection hole (242) is formed at the center point on the upper side of the hollow disc (241), and the connection hole (242) is connected to the lower end of the delivery pipe (23).

6. The anti-leakage device for a flue gas desulfurization system in a thermal power plant according to claim 5, characterized in that, A buffer cavity (243) is arranged inside the hollow disc (241), nozzles (244) are connected to the outer peripheral edge of the hollow disc (241), and the nozzles (244) are connected to the edge of the hollow disc (241) in an annular matrix structure.

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