CN219199221U - Anti-blocking device suitable for wet double-tower desulfurization middle flue - Google Patents

Abstract

The utility model relates to an anti-blocking device suitable for a wet double-tower desulfurization middle flue, which comprises: a sedimentation opening which is arranged on the lower end surface of the flue gas pipeline and is exposed by the flue gas sediment transfer structure; the flue gas sediment transfer structure comprises a transportation annular belt, wherein the transportation annular belt covers the sedimentation opening in the circulating operation process and transfers the flue gas sediment at the sedimentation opening to the flue gas sediment recovery structure; the flue gas sediment recovery structure is arranged at the lower end of the flue gas sediment transfer structure, and the inlet end of the flue gas sediment recovery structure is arranged around the edge of the flue gas sediment transfer structure, so that the flue gas sediment recovery structure has the advantage of preventing a flue gas pipeline from being blocked by transferring sediment in flue gas to the sediment recovery structure by utilizing a transportation annular belt.

Description

Anti-blocking device suitable for wet double-tower desulfurization middle flue

Technical Field

The utility model relates to the technical field of wet double-tower desulfurization structures, in particular to an anti-blocking device suitable for a wet double-tower desulfurization middle flue.

Background

Along with the promotion of the comprehensive implementation of ultralow emission reconstruction work of coal-fired power plants in China, a wet double-tower desulfurization technology is commonly adopted in a high-sulfur coal burning area, namely, a primary absorption tower and a secondary absorption tower are connected in series to realize synergistic desulfurization.

In order to reduce the resistance of a desulfurization system in the actual reconstruction process, the number of layers of a demister of a primary absorption tower is generally reduced or the demister of the primary absorption tower is directly removed, so that a large amount of slurry mist drops carried in flue gas at an outlet of the primary absorption tower cannot be effectively trapped, when the slurry mist drops pass through a middle flue of a primary absorption tower and a secondary absorption tower, the slurry mist drops are continuously deposited at the bottom of the flue under the action of gravity, the middle flue is blocked, the system resistance is increased, and the risks of flue collapse and non-stop of a unit are caused in severe cases.

For example, CN 213132567U discloses a flue anti-blocking device of an absorption tower, which increases sedimentation effect by increasing flue gas flow rate, but does not provide a better solution for sediment treatment.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, thereby providing the anti-blocking device suitable for the wet double-tower desulfurization middle flue.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an anti-blocking device suitable for a wet double-tower desulfurization middle flue, comprising: a sedimentation opening which is arranged on the lower end surface of the flue gas pipeline and is exposed by the flue gas sediment transfer structure;

the flue gas sediment transfer structure comprises a transportation annular belt, wherein the transportation annular belt covers the sedimentation opening in the circulating operation process and transfers the flue gas sediment at the sedimentation opening to the flue gas sediment recovery structure;

the flue gas sediment recovery structure is arranged at the lower end of the flue gas sediment transfer structure, and the inlet end of the flue gas sediment recovery structure is arranged around the edge of the flue gas sediment transfer structure.

Preferably, the running direction of the transportation ring belt is consistent with the flow direction of the flue gas in the flue gas pipeline.

Preferably, a cleaning structure is also included to assist the sediment on the transport ring belt to drop into the flue gas sediment recovery structure.

Preferably, the cleaning structure comprises at least one scraper blade which is arranged below the conveying endless belt and closely attached to the conveying endless belt,

and/or at least one spray piece which is arranged below the endless belt and has an adjustable spray opening.

Preferably, the length of the scraper in the first direction is not smaller than the length of the sedimentation opening in the first direction.

Preferably, the flue gas sediment recovery structure comprises a slurry bucket, a return pipeline, a slurry tank and a discharge pipeline;

the return pipeline is connected with the slurry hopper and the slurry tank, and a control valve is arranged on the return pipeline;

the discharge pipeline is connected with the slurry tank and the absorption tower, and a slurry discharge pump is arranged on the discharge pipeline.

Preferably, the slurry bucket is provided in a funnel shape, and the inner surface thereof is coated with a corrosion-preventing material.

Preferably, the control valve is opened as the conveyor belt runs and closed as the conveyor belt is stationary.

Preferably, the flue gas sediment transfer structure further comprises a driving roller and a driven roller for driving the transportation endless belt to operate;

the two ends of the transport endless belt are respectively wound on the driving roller and the driven roller;

and a plurality of carrier rollers for supporting the conveying endless belt are arranged between the driving roller and the driven roller, and the carrier rollers push the upper end of the conveying endless belt to keep horizontal with the sedimentation opening.

Preferably, the drive roller drives the transport endless belt to intermittently run, and the transport endless belt rotates at least two turns each time.

Compared with the prior art, the utility model has the beneficial effects that:

according to the anti-blocking device suitable for the wet double-tower desulfurization middle flue, provided by the technical scheme, the sediment in the flue gas is transferred to the sediment recovery structure by utilizing the transportation annular belt, so that the advantage of preventing the flue gas pipeline from being blocked can be achieved, meanwhile, the sedimentation opening is always covered in the transportation annular belt circulation operation process, the flue gas can be prevented from directly entering the flue gas sediment recovery structure from the sedimentation opening, on one hand, the sedimentation of the flue gas is facilitated, and on the other hand, the transfer effect of the flue gas can not be influenced by the arrangement of the structure.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of the present utility model.

Reference numerals illustrate:

1. a flue gas duct; 10. a sedimentation port;

2. a flue gas sediment transfer structure; 21. a transport endless belt; 22. a driving roller; 23. driven roller; 24. a carrier roller;

3. a flue gas sediment recovery structure; 31. a slurry bucket; 32. a return line; 33. a slurry tank; 34. a discharge line; 35. a control valve; 36. a slurry discharge pump;

4. cleaning the structure; 41. a scraper; 42. a spray member; 421. a water supply pipe; 422. a water tank; 423. high pressure flushing water pump.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, the embodiment of the utility model provides an anti-blocking device suitable for a wet double-tower desulfurization middle flue, which comprises: a sedimentation port 10 which is arranged on the lower end surface of the flue gas pipeline 1 and is exposed by the flue gas sediment transfer structure 2; the flue gas sediment transfer structure 2 comprises a transportation ring belt 21, wherein the transportation ring belt 21 covers the sedimentation opening 10 in the circulating operation process, and transfers the flue gas sediment at the sedimentation opening 10 to the flue gas sediment recovery structure 3; the flue gas sediment recovery structure 3 is arranged at the lower end of the flue gas sediment transfer structure 2, and the inlet end of the flue gas sediment recovery structure is arranged around the edge of the flue gas sediment transfer structure 2.

In the scheme, two ends of a flue gas pipeline 1 in the device are connected with an absorption tower, the absorption tower comprises a primary absorption tower and a secondary absorption tower, flue gas flows from the primary absorption tower to the secondary absorption tower through the flue gas pipeline 1, and in the process that the flue gas passes through the flue gas pipeline 1, sediment (mainly: slurry mist drops) in the flue gas is deposited on a transportation ring belt 21 from a sedimentation port 10.

In the process of absorbing sediment (mainly: slurry mist drops) by the transport endless belt 21, the transport endless belt 21 can continuously run, and then the sediment (mainly: slurry mist drops) is absorbed in the running process, and falls to the flue gas sediment recovery structure 3 under the action of gravity after the absorbed sediment (mainly: slurry mist drops) reaches a certain gravity; the conveyor belt 21 may also be operated intermittently such that during standstill of the conveyor belt 21, it adsorbs the sediment (mainly: slurry mist) towards one side of the settling opening 10 (i.e. the vertically upward side), the side remote from the settling opening 10 (i.e. the vertically downward side) towards the flue gas sediment recovery structure 3, the conveyor belt 21 starts to operate after adsorbing a certain amount of sediment (mainly: slurry mist) such that the side where the sediment (mainly: slurry mist) is deposited moves to the side towards the flue gas sediment recovery structure 3, and the sediment (mainly: slurry mist) falls into the flue gas sediment recovery structure 3 under the action of gravity, while the other side is transferred to the settling opening 10 to adsorb the sediment (mainly: slurry mist) again.

According to the scheme, sediment (mainly slurry fog drops) in the flue gas is transferred to the flue gas sediment recovery structure 3 by using the transportation annular belt 21, so that the advantage of preventing the flue gas pipeline 1 from being blocked can be achieved, meanwhile, the sedimentation opening 10 is always covered in the circulating operation process of the transportation annular belt 21, the flue gas can be prevented from directly entering the flue gas sediment recovery structure 3 from the sedimentation opening 10, on one hand, sedimentation of the flue gas is facilitated, on the other hand, the transfer effect of the flue gas can not be influenced by the setting of the anti-blocking device, and the foreign matters in the flue gas pipeline 1 can be settled and transferred, so that part or all of demisters in the first-stage absorption tower can be removed, the flue gas running resistance can be reduced, overhaul and maintenance work of the demisters in the later stage can be reduced, and a good energy-saving effect is achieved.

Specifically, the flue gas sediment transfer structure 2 further comprises a driving roller 22 and a driven roller 23 for driving the transportation endless belt 21 to operate; the driving roller 22 in the device can be driven by a motor, the opening and closing time intervals of the motor can be controlled by a controller, the driving roller 22 is further controlled to drive the transportation endless belt 21 to intermittently operate, the transportation endless belt 21 rotates for two, three or more circles each time, the transportation endless belt 21 in the device can be arranged to be a rubber belt, and elastic absorption parts such as sponge, water absorption fibers and the like can be arranged on the surface of the rubber belt, so that the absorption effect of the transportation endless belt 21 on sediments (mainly slurry mist drops) in smoke is improved.

The two ends of the transport endless belt 21 are respectively wound on a driving roller 22 and a driven roller 23; the running direction of the driving roller 22 in this device can be set to the same direction as the flue gas direction or reverse, and preferably the running direction of the transportation girdle 21 keeps the same with the flue gas flowing direction in the flue gas pipeline 1, because the flue gas just enters the flue gas pipeline 1, the sediment is more, and the transportation girdle 21 and the flue gas running direction are set in the same direction, can make transportation girdle 21 and flue gas get into the same side position of the subsidence mouth 10 simultaneously, namely: after the sediment (mainly: slurry mist drops) on the transportation ring belt 21 falls to the smoke sediment recovery structure 3, the sediment is rotated to the sedimentation port 10 and is contacted with the foreign matters just entering the smoke pipeline 1, and the design ensures that the transportation ring belt 21 can better absorb the sediment in the process of continuously running for a plurality of circles.

In order to keep the transportation ring belt 21 and the sedimentation port 10 (namely, the lower end surface of the flue gas pipeline 1) horizontal, gaps are prevented from being generated between the transportation ring belt 21 and the sedimentation port 10, the air tightness of the sedimentation port 10 is further affected, a plurality of carrier rollers 24 for supporting the transportation ring belt 21 are further arranged between the driving roller 22 and the driven roller 23 in the device, the carrier rollers 24 push the upper end of the transportation ring belt 21 to keep horizontal with the sedimentation port 10, and the carrier rollers 24 can be arranged in an array along the flue gas running direction.

In order to facilitate the sediment (mainly: slurry mist) on the transportation ring belt 21 to fall into the fume sediment recovery structure 3, the device is also provided with a cleaning structure 4 for assisting the sediment (mainly: slurry mist) on the transportation ring belt 21 to fall into the fume sediment recovery structure 3.

The cleaning structure 4 can be set to be various, can realize that the driving sediment breaks away from the transportation girdle 21, and fall to the flue gas sediment recovery structure 3.

In one embodiment, the cleaning structure 4 includes at least one scraper 41 disposed below the conveying belt 21 and closely attached to the conveying belt 21, during the rotation of the conveying belt 21, the scraper 41 is used to scrape the slurry deposited on the conveying belt 21, at this time, the length of the scraper 41 along the first direction is not less than the length of the sedimentation opening 10 along the first direction, the first direction is the vertical direction of the flue gas conveying direction, that is, the central axis direction of the driving roller 22 or the driven roller 23, and the scraper 41 can be disposed at intervals along the running direction of the conveying belt 21, so that the scraper 41 can scrape the surface of the conveying belt 21, so that sediment (mainly: slurry mist) is avoided from being left when the surface of the conveying belt 21 is not scraped, and on the other hand, when the surface of the conveying belt 21 is covered with the elastic absorbent, the elastic absorbent is squeezed, so that the extrusion of the liquid in the sediment (mainly: slurry mist) is facilitated.

In the second real-time example, the cleaning structure 4 includes at least one spraying piece 42 which is arranged below the transportation annular belt 21 and has an adjustable spraying opening, the spraying opening of the spraying piece 42 is adjustable, the adjustment mode is capable of sliding and rotating to adjust, so that the spraying opening of the spraying piece 42 can face the transportation annular belt 21, further, sediment (mainly: slurry mist drops) deposited on the transportation annular belt 21 can be flushed down in the operation process of the transportation annular belt 21, the sediment (mainly: slurry mist drops) falls into the flue gas sediment recovery structure 3 under the action of gravity, the spraying piece 42 can be provided with a nozzle, a spray pipe, a shower nozzle and the like, the spraying piece 42 can be provided with a plurality of spraying pieces at intervals along the operation direction of the transportation annular belt 21, the spraying piece 42 is connected with the water tank 422 through the water supply pipe 421, and the water in the water tank 422 can adopt desulfurization waste water, so that the recycling of part of the desulfurization waste water can be realized as high-pressure flushing water; the water supply pipe 421 is provided with the high-pressure flushing water pump 423, so that the water supply pipe 421 can provide enough spray water for the spray piece 42, and the design of the spray piece 42 is also beneficial to flushing the gap between the elastic absorption pieces when the surface of the transportation annular belt 21 is covered with the elastic absorption pieces, so that the cleaning effect on the transportation annular belt 21 is better.

In the third embodiment, the cleaning structure 4 includes the scraper 41 and the spraying member 42, which has the advantages of both the scraper 41 and the spraying member 42, and also enables the spraying member 42 to flush the scraper 41 and the transportation endless belt 21 at the same time; the scraping plate 41 and the spraying piece 42 are matched, namely a plurality of groups of cleaning pieces are arranged, each group of cleaning pieces comprises one scraping plate 41 and at least one spraying piece 42, so that the scraping plate 41 can scrape sediment (mainly slurry mist drops) deposited on the conveying endless belt 21, and meanwhile, the spraying piece 42 can wash out residual slurry on the scraping plate 41; the spraying member 42 may be provided as one, and in this case, the spraying member 42 may be provided on a side of the scraper 41 that is in contact with the conveyor belt 21 (i.e., a side where sediment is easily accumulated), so as to facilitate flushing of the scraper 41; the shower 42 may be provided symmetrically with respect to the squeegee 41, and both sides of the squeegee 41 may be rinsed.

In other embodiments, the cleaning structure 4 may be configured as a cleaning brush, a cleaning roller, or the like.

In order to facilitate the recovery of the sediment (mainly: slurry mist drops) and enable the sediment (mainly: slurry mist drops) and the spray liquid to be directly refluxed for use, the flue gas sediment recovery structure 3 comprises a slurry bucket 31, a reflux pipeline 32, a slurry tank 33 and a discharge pipeline 34;

the return pipeline 32 connects the slurry bucket 31 and the slurry tank 33, and a control valve 35 is arranged on the return pipeline 32, so that sediment (mainly: slurry mist) and flushing fluid falling into the slurry bucket 31 can flow to the slurry tank 33, the slurry bucket 31 can be arranged in a funnel shape for facilitating the sediment (mainly: slurry mist) and flushing fluid to flow into the return pipeline 32, and the inner surface of the slurry bucket 31 can be further coated with a corrosion-resistant material; in order that the setting of the anti-blocking device does not affect the air tightness of the flue gas pipeline 1, the control valve 35 is opened along with the running of the transportation annular belt 21 and is closed along with the static state of the transportation annular belt 21;

in order to enable the slurry to directly flow back for use without secondary transfer treatment, a slurry tank 33 and an absorption tower are connected by a discharge pipeline 34, and a slurry discharge pump 36 is arranged on the discharge pipeline 34. As shown in fig. 1, the absorption tower comprises a primary absorption tower and a secondary absorption tower which are arranged at two sides of a flue gas pipeline 1, the discharge pipeline 34 can be independently connected with the slurry tank 33 and the primary absorption tower, can be independently connected with the slurry tank 33 and the secondary absorption tower, and can be simultaneously connected with the primary absorption tower and the secondary absorption tower, so that limestone particles which do not completely react in sediments (mainly: slurry mist drops) can be recycled.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims (10)

1. Anti-blocking device suitable for flue in middle of two tower desulfurization of wet process, its characterized in that includes: a sedimentation opening (10) which is arranged on the lower end surface of the flue gas pipeline (1) and is exposed by the flue gas sediment transfer structure (2);

the flue gas sediment transfer structure (2) comprises a transportation annular belt (21), wherein the transportation annular belt (21) covers the sedimentation opening (10) in the circulating operation process and transfers the flue gas sediment at the sedimentation opening (10) to the flue gas sediment recovery structure (3);

the flue gas sediment recovery structure (3) is arranged at the lower end of the flue gas sediment transfer structure (2), and the inlet end of the flue gas sediment recovery structure is arranged around the edge of the flue gas sediment transfer structure (2).

2. An anti-blocking device for a wet double tower desulfurization middle flue according to claim 1, wherein the running direction of the transportation ring belt (21) is consistent with the flow direction of the flue gas in the flue gas pipeline (1).

3. An anti-blocking device for a wet twin tower desulfurization intermediate flue according to claim 1 or 2, further comprising a cleaning structure (4) to assist the sediment on the conveyor belt (21) to fall into the flue gas sediment recovery structure (3).

4. An anti-blocking device for a wet double-tower desulfurization intermediate flue according to claim 3, wherein the cleaning structure (4) comprises at least one scraper (41) arranged below the conveyor belt (21) and closely attached thereto,

and/or at least one spray member (42) arranged below the conveyor belt (21) and with an adjustable spray opening.

5. An anti-blocking device for a wet double tower desulfurization middle flue according to claim 4, wherein the length of the scraper (41) along the first direction is not less than the length of the settling port (10) along the first direction.

6. An anti-blocking device for a wet double-tower desulfurization middle flue according to claim 1, wherein the flue gas sediment recovery structure (3) comprises a slurry bucket (31), a return pipeline (32), a slurry tank (33) and a discharge pipeline (34);

the return pipeline (32) is connected with the slurry hopper (31) and the slurry tank (33), and a control valve (35) is arranged on the return pipeline (32);

the discharge pipeline (34) is connected with the slurry tank (33) and the absorption tower, and a slurry discharge pump (36) is arranged on the discharge pipeline (34).

7. An anti-blocking device for a wet process twin tower desulfurization middle flue according to claim 6, wherein the slurry hopper (31) is provided in a funnel shape and the inner surface thereof is coated with an anti-corrosive material.

8. An anti-blocking device for wet twin tower desulfurization middle flue according to claim 6, characterized in that the control valve (35) is opened with the movement of the conveyor belt (21) and closed with the stationary conveyor belt (21).

9. An anti-blocking device suitable for a wet double-tower desulfurization middle flue according to claim 1, wherein the flue gas sediment transfer structure (2) further comprises a driving roller (22) and a driven roller (23) for driving the transportation endless belt (21) to operate;

the two ends of the conveying endless belt (21) are respectively wound on the driving roller (22) and the driven roller (23);

a plurality of carrier rollers (24) for supporting the transportation endless belt (21) are further arranged between the driving roller (22) and the driven roller (23), and the carrier rollers (24) push the upper end of the transportation endless belt (21) to keep level with the sedimentation opening (10).

10. An anti-blocking device for a wet twin tower desulfurization intermediate flue according to claim 9, wherein the drive roller (22) drives the conveyor belt (21) to operate intermittently, and the conveyor belt (21) rotates at least two turns per operation.

Images