CN219494080U

CN219494080U - Ash removal device for circulating fluidized bed boiler

Info

Publication number: CN219494080U
Application number: CN202320657136.4U
Authority: CN
Inventors: 孙祥德; 王宇; 王欣羽; 刘西华
Original assignee: Zhengzhou Lanma Electromechanical Technology Co ltd
Current assignee: Zhengzhou Lanma Electromechanical Technology Co ltd
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-08-08
Anticipated expiration: 2033-03-29

Abstract

The utility model discloses an ash removal device for a circulating fluidized bed boiler, which comprises a waste heat recovery flue, wherein a superheater is arranged above the inside of the waste heat recovery flue, and an economizer is arranged below the superheater; further comprises: the ash removing mechanism is arranged on one side of the waste heat recovery flue and is communicated with the waste heat recovery flue, a first screw rod is rotatably arranged in the ash removing mechanism in the front-back direction, the lower end of the first screw rod is driven by a motor, first sliding blocks are arranged outside the first screw rod, a transverse displacement mechanism is fixedly arranged between the first sliding blocks, and a dry ice spray gun is slidably arranged on one side of the transverse displacement mechanism; the movable baffle is arranged on one side, close to the waste heat recovery flue, of the inside of the ash removal mechanism, a plurality of movable baffles are arranged, and the movable baffles are adjacent to each other and connected through a rotating shaft, so that the problems that flue dust impurities in a circulating fluidized bed boiler affect the flue gas passing efficiency and the heat exchange efficiency more are solved.

Description

Ash removal device for circulating fluidized bed boiler

Technical Field

The utility model relates to the technical field of circulating fluidized bed boilers, in particular to an ash removal device for a circulating fluidized bed boiler.

Background

The circulating fluidized bed boiler adopts clean coal combustion technology with highest industrialization degree. The circulating fluidized bed boiler adopts fluidized combustion, and the main structure comprises a combustion chamber and a circulating furnace. The biggest difference with bubbling fluidized bed combustion technology is that the operation wind speed is high, heterogeneous reaction processes such as combustion and desulfurization are enhanced, the boiler capacity can be expanded to a large capacity acceptable in the electric power industry, and the basic problems of heat, mechanics, materialics and the like of the circulating fluidized bed boiler are well solved.

For example, chinese issued patent number CN214745693U, a circulating fluidized bed boiler structure, includes a back flue, which includes a membrane wall and a back heating surface disposed inside the membrane wall. Film type water-cooled wall bodies are arranged around the tail heating surface vertical shafts, the periphery of the film type water-cooled wall bodies are tightly sealed, the tail heating surface is contained, the sealing performance can be improved, the film type water-cooled wall manufacturing mechanization degree is high, the installation is simple and convenient, and the manufacturing cost is low.

The prior art is used for a long time, a large amount of dust and impurities in the waste heat recovery flue can be attached to the pipelines of the superheater and the economizer, so that the passing efficiency of flue gas is affected, and the heat exchange efficiency is reduced, so that the prior requirements are not met, and the ash removal device for the circulating fluidized bed boiler is provided.

Disclosure of Invention

The utility model aims to provide an ash removal device for a circulating fluidized bed boiler, which solves the problem that more flue dust impurities in the circulating fluidized bed boiler affect the flue gas passing efficiency and the heat exchange efficiency in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the ash removal device for the circulating fluidized bed boiler comprises a waste heat recovery flue, wherein a superheater is arranged above the inside of the waste heat recovery flue, and an economizer is arranged below the superheater; further comprises:

the ash removing mechanism is arranged on one side of the waste heat recovery flue and is communicated with the waste heat recovery flue, a first screw rod is rotatably arranged in the ash removing mechanism in the front-back direction, the lower end of the first screw rod is driven by a motor, first sliding blocks are arranged outside the first screw rod, a transverse displacement mechanism is fixedly arranged between the first sliding blocks, and a dry ice spray gun is slidably arranged on one side of the transverse displacement mechanism;

the movable baffles are arranged on one side, close to the waste heat recovery flue, inside the ash cleaning mechanism, a plurality of movable baffles are arranged, and the adjacent movable baffles are connected through a rotating shaft.

Preferably, the lower extreme of ash removal mechanism opposite side is provided with the compressor, one side of compressor top is provided with the high pressure gas pitcher, and the output of compressor passes through the pipeline connection with the input of high pressure gas pitcher, the opposite side of compressor top is provided with dry ice storage bin, and the input of dry ice storage bin passes through the pipeline connection with the output of high pressure gas pitcher, and the output of dry ice storage bin passes through the conveying hose with the dry ice spray gun and is connected.

Preferably, a screw and a screw sliding block are arranged in the transverse displacement mechanism, and one side of the screw sliding block is fixed with the dry ice spray gun.

Preferably, the second screw rod is installed to the upper and lower rotation of ash removal mechanism one side, and the one end of second screw rod is driven by the motor, the second sliding block is all installed to the outside of second screw rod, and the second sliding block with the outside pass through the connecting rod between the movable baffle fixedly.

Preferably, balls are arranged at one end of the rotating shaft, and the balls are in sliding connection with the ash removing mechanism.

Preferably, the movable baffle is made of porous glass fiber board.

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

1. the utility model utilizes the sprayed dry ice to clean dust on the surfaces of the superheater and the economizer pipeline, stores high-pressure gas into the high-pressure gas tank by starting the compressor, fills the gas into the dry ice storage bin through the pipeline, then increases the air flow to enable the ice-gas mixture to enter the dry ice spray gun through the conveying hose, realizes the spraying of the dry ice on the superheater and the economizer pipeline, the dry ice can be attached to the surface of the pipeline, freezes fragile dirt, the dirt breaks on the surface of the pipeline and becomes solid from a viscoelastic state, the adsorption force on the surface is rapidly reduced along with the increase of brittleness and the reduction of viscosity, the self-stripping of the surface dust and the impurity is realized, meanwhile, the compressed high-flow-rate air generates shearing force on the fragile dust and leads to mechanical fracture, and because the low-temperature shrinkage rate difference between the dust and the pipeline is large, the stress is concentrated on the contact surface, and in addition, when the high-speed dry ice particles collide with the surface of the raised dust and the impurity, the kinetic energy is transferred to the impurity to overcome the adhesion force, the generated shearing force can lead to the dirt to rolling along with the air flow, thereby achieving the purpose of the dust and the impurity along with the surface of the pipeline.

2. According to the utility model, the vertical and horizontal displacement mechanisms are matched with the dry ice spray gun to spray dry ice particles on the superheater and the economizer pipeline, the motor at the lower end of the first screw rod is started, the output shaft of the motor drives the first screw rod to rotate, the first screw rod is matched with the threads of the first sliding block to convert rotary motion into linear motion, the transverse displacement mechanism is driven to vertically move, meanwhile, the screw rod is arranged in the transverse displacement mechanism, and is matched with the screw rod sliding block to drive the transverse displacement mechanism to reciprocate and transversely move, so that the dry ice particles are sprayed in the waste heat recovery flue in all directions, and the cleaning effect of dust and impurities is further improved.

3. According to the utility model, the movable baffle is arranged between the ash removing mechanism and the waste heat recovery flue, when the circulating fluidized bed boiler works, the movable baffle seals the ash removing mechanism and the waste heat recovery flue, high-temperature flue gas cannot enter the ash removing mechanism, when the waste heat recovery flue needs to be cleaned, the motor at one end of the second screw rod is started to drive the second screw rod to rotate, the outer movable baffle is driven to move towards the inner movable baffle through the connecting rod under the cooperation of the second sliding block, in the moving process, extrusion force is transmitted to the rotating shaft, the movable baffles are relatively rotated, so that the movable baffles are folded, the ash removing mechanism is communicated with the waste heat recovery flue, and the ash removing operation of the dry ice spray gun is facilitated.

Drawings

FIG. 1 is a schematic view of the internal structure of the present utility model;

FIG. 2 is a perspective view of a lateral displacement mechanism of the present utility model;

FIG. 3 is a schematic view of the internal part of the ash removing mechanism of the present utility model;

fig. 4 is a perspective view of a flapper of the present utility model.

In the figure: 1. waste heat recovery flue; 2. a superheater; 3. an economizer; 4. an ash removing mechanism; 5. a first screw; 6. a first slider; 7. a dry ice spray gun; 8. a conveying hose; 9. a compressor; 10. a high pressure gas tank; 11. a dry ice storage bin; 12. a movable baffle; 13. a lateral displacement mechanism; 14. a rotating shaft; 15. a ball; 16. a second slider; 17. a second screw; 18. and (5) connecting a rod.

Description of the embodiments

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 1-4, an embodiment of the present utility model is provided: the ash removal device for the circulating fluidized bed boiler comprises a waste heat recovery flue 1, wherein a superheater 2 is arranged above the inside of the waste heat recovery flue 1, and an economizer 3 is arranged below the superheater 2; further comprises:

the ash removing mechanism 4 is arranged on one side of the waste heat recovery flue 1, the ash removing mechanism 4 is communicated with the waste heat recovery flue 1, a first screw rod 5 is rotatably arranged in the ash removing mechanism 4 in the front-back direction, the lower end of the first screw rod 5 is driven by a motor, first sliding blocks 6 are arranged outside the first screw rod 5, a transverse displacement mechanism 13 is fixedly arranged between the first sliding blocks 6, and a dry ice spray gun 7 is slidably arranged on one side of the transverse displacement mechanism 13;

the movable baffles 12 are arranged at one side, close to the waste heat recovery flue 1, inside the ash cleaning mechanism 4, a plurality of movable baffles 12 are arranged, and adjacent movable baffles 12 are connected through a rotating shaft 14.

When the ash removing device is used, the movable baffle 12 is automatically folded, the ash removing mechanism 4 is communicated with the waste heat recovery flue 1, dry ice particles are sprayed on the pipeline surfaces of the superheater 2 and the economizer 3 by the dry ice spray gun 7, and vertical and transverse reciprocating movement is realized under the cooperation of the first screw 5 and the transverse displacement mechanism 13, so that efficient ash removing is realized.

Referring to fig. 3, a compressor 9 is disposed at the lower end of the other side of the ash cleaning mechanism 4, a high-pressure air tank 10 is disposed at one side above the compressor 9, the output end of the compressor 9 is connected with the input end of the high-pressure air tank 10 through a pipeline, a dry ice storage bin 11 is disposed at the other side above the compressor 9, the input end of the dry ice storage bin 11 is connected with the output end of the high-pressure air tank 10 through a pipeline, the output end of the dry ice storage bin 11 is connected with a dry ice spray gun 7 through a conveying hose 8, and separation between dust impurities and the pipeline is rapidly achieved under the action of dry ice.

Referring to fig. 2, a screw and a screw slider are disposed inside the transverse displacement mechanism 13, and one side of the screw slider is fixed with the dry ice spray gun 7 to realize the transverse displacement of the dry ice spray gun 7, and the screw slider are known in the prior art, so that description thereof is omitted.

Referring to fig. 4, a second screw rod 17 is rotatably installed at one side of the ash cleaning mechanism 4, one end of the second screw rod 17 is driven by a motor, a second sliding block 16 is installed at the outer portion of the second screw rod 17, the second sliding block 16 and the outer movable baffle 12 are fixed by a connecting rod 18, and along with the movement of the second sliding block 16, the movable baffle 12 can be folded and unfolded.

Referring to fig. 4, balls 15 are disposed at one end of the rotating shaft 14, and the balls 15 are slidably connected with the ash cleaning mechanism 4, so as to improve the smoothness of the movement.

Further, the movable baffle 12 is made of porous glass fiber board, so that heat isolation between the ash cleaning mechanism 4 and the waste heat recovery flue 1 is realized.

Working principle: when in use, the motor at one end of the second screw rod 17 is started to drive the second screw rod 17 to rotate, the outer movable baffle 12 is driven to move towards the inner movable baffle 12 by the connecting rod 18 under the cooperation of the second sliding block 16, the extrusion force is transmitted to the rotating shaft 14 in the moving process, the movable baffles 12 are enabled to rotate relatively, the folding between the movable baffles is realized, the ash cleaning mechanism 4 is communicated with the waste heat recovery flue 1, the motor at the lower end of the first screw rod 5 is started, the output shaft drives the first screw rod 5 to rotate, the rotation motion is converted into linear motion under the threaded cooperation of the first screw rod 5 and the first sliding block 6, the transverse displacement mechanism 13 is driven to vertically move, meanwhile, the screw rod is arranged in the transverse displacement mechanism 13, and the screw rod is matched with the screw rod sliding block to drive the transverse displacement mechanism 13 to reciprocate and transversely move, and the compressor 9 is started, storing high-pressure gas into a high-pressure gas tank 10, filling the gas into a dry ice storage bin 11 through a pipeline by the high-pressure gas tank 10, then increasing the airflow to enable the ice-gas mixture to enter a dry ice spray gun 7 through a conveying hose 8, realizing the spraying of dry ice to the pipeline of the superheater 2 and the economizer 3, enabling the dry ice to adhere to the surface of the pipeline, freezing fragile dirt, breaking the dirt on the surface of the pipeline, changing the dirt into solid from a viscoelastic state, enabling the adsorption force on the surface to be rapidly reduced along with the increase of brittleness and the decrease of viscosity, realizing the self-stripping of dust impurities on the surface, simultaneously, generating shearing force on fragile dust impurities by compressed high-flow-rate air, causing mechanical fracture, and separating the dust impurities under the action of shearing force due to the fact that the difference of low-temperature shrinkage rate between the dust impurities and the pipeline is large, the stress is concentrated on the contact surface, in addition, when the high-speed dry ice particles collide with the surface of the raised dust impurities, kinetic energy is transferred to the dust impurities so as to overcome the reduced adhesion force, and therefore, the generated shearing force can cause dirt to roll away along with the airflow, so that the purpose of dust impurities on the surface of the pipeline is achieved.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The ash removal device for the circulating fluidized bed boiler comprises a waste heat recovery flue (1), wherein a superheater (2) is arranged above the inside of the waste heat recovery flue (1), and an economizer (3) is arranged below the superheater (2);

the method is characterized in that: further comprises:

the ash removing mechanism (4) is arranged on one side of the waste heat recovery flue (1), the ash removing mechanism (4) is communicated with the waste heat recovery flue (1), a first screw (5) is rotatably arranged in the ash removing mechanism (4) in a front-back mode, the lower end of the first screw (5) is driven by a motor, first sliding blocks (6) are arranged outside the first screw (5), a transverse displacement mechanism (13) is fixedly arranged between the first sliding blocks (6), and a dry ice spray gun (7) is slidably arranged on one side of the transverse displacement mechanism (13);

the movable baffles (12) are arranged at one side, close to the waste heat recovery flue (1), inside the ash cleaning mechanism (4), a plurality of movable baffles (12) are arranged, and adjacent movable baffles (12) are connected through a rotating shaft (14).

2. The ash removal device for a circulating fluidized bed boiler according to claim 1, wherein: the lower extreme of deashing mechanism (4) opposite side is provided with compressor (9), one side of compressor (9) top is provided with high-pressure gas jar (10), and the output of compressor (9) passes through pipe connection with the input of high-pressure gas jar (10), the opposite side of compressor (9) top is provided with dry ice storage bin (11), and the input of dry ice storage bin (11) passes through pipe connection with the output of high-pressure gas jar (10), and the output of dry ice storage bin (11) is connected through conveying hose (8) with dry ice spray gun (7).

3. The ash removal device for a circulating fluidized bed boiler according to claim 1, wherein: the inside of transverse displacement mechanism (13) is provided with lead screw and lead screw slider, and one side of lead screw slider is fixed with dry ice spray gun (7).

4. The ash removal device for a circulating fluidized bed boiler according to claim 1, wherein: the second screw rod (17) is installed in the upper and lower rotation of ash removal mechanism (4) one side, and the one end of second screw rod (17) is driven by the motor, second sliding block (16) are all installed to the outside of second screw rod (17), and second sliding block (16) with the outside fix through connecting rod (18) between movable baffle (12).

5. The ash removal device for a circulating fluidized bed boiler according to claim 4, wherein: one end of the rotating shaft (14) is provided with balls (15), and the balls (15) are in sliding connection with the ash cleaning mechanism (4).

6. The ash removal device for a circulating fluidized bed boiler according to claim 4, wherein: the movable baffle (12) is made of porous glass fiber board.