CN112707621A

CN112707621A - Thermal power plant waste water treatment sludge concentration device

Info

Publication number: CN112707621A
Application number: CN202011333659.0A
Authority: CN
Inventors: 高燕宁; 刘克成; 郁金星; 陈秋
Original assignee: Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd; State Grid Hebei Energy Technology Service Co Ltd; State Grid Corp of China SGCC
Current assignee: Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd; State Grid Hebei Energy Technology Service Co Ltd; State Grid Corp of China SGCC
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-04-27

Abstract

The invention discloses a sludge concentration device for wastewater treatment of a thermal power plant, which comprises a spiral concentrator, a water filtering pool and a gravity separator, wherein the gravity separator is used for separating solid and liquid in the water filtering pool again; spiral thickener includes the horizontal barrel of columniform one end shutoff, transversely set up in the barrel and with barrel normal running fit's auger, fixed set up at the barrel top and with the inside feeder hopper that communicates of barrel and set up at the barrel opening side and with the barrel between the adjustable end cover in clearance. The sludge enters the spiral thickener through the feed hopper, and the spiral thickener filters redundant moisture in the sludge and discharges the concentrated sludge. The filtered water flows into the filter tank through the pipeline, the sludge continuously works when being concentrated in the cylinder, and the concentrated sludge is continuously discharged from the space between the end cover and the cylinder, so the working efficiency is high.

Description

Thermal power plant waste water treatment sludge concentration device

Technical Field

The invention relates to the technical field of sludge concentration, in particular to a sludge concentration device for wastewater treatment of a thermal power plant.

Background

The thermal power plant can produce waste water in the production process, and the waste water can produce a lot of sludge after precipitation. The sludge is formed by mixing water and solid sediment substances such as fly ash and the like generated in the production process. The wastewater is deposited in the sedimentation tank to form sludge which needs to be cleaned regularly. The cleaned sludge needs to be concentrated, and the water content is reduced, so that the transportation and the post treatment are facilitated.

The existing sludge concentration treatment device mainly adopts a centralized treatment method, and generally adopts a plate-and-frame filter press to concentrate sludge. The treatment mode is intermittent operation, sludge with high water content is extruded in the filter press, and redundant water is filtered. The method has low sludge treatment efficiency, and the filtered water obtained after filtration also contains a certain amount of solid particles.

Disclosure of Invention

The invention aims to solve the technical problem of providing a sludge concentration device for wastewater treatment of a thermal power plant, which is used for solving the problem of low efficiency in sludge concentration.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a sludge concentration device for wastewater treatment of a thermal power plant comprises a spiral concentrator, a filter tank for collecting filtrate of the spiral concentrator and a gravity separator for separating solid and liquid in the filter tank again, wherein the spiral concentrator and the gravity separator are communicated with the filter tank through pipelines; spiral concentrated machine includes the horizontal barrel of columniform one end shutoff, transversely set up in the barrel and with barrel normal running fit's auger, fixed set up at the barrel top and with the inside feeder hopper that communicates of barrel and set up at the barrel opening side and with the barrel between the clearance adjustable end cover, the barrel is fixed in one side relative with the end cover and is provided with and is used for driving auger pivoted motor, be equipped with the drainage hole on the lateral wall of barrel.

Further, the barrel is a hollow closed double-layer structure, and comprises an inner barrel and an outer barrel sleeved outside the inner barrel, a gap is formed between the inner barrel and the outer barrel, the gap is a water filtering cavity, the outer barrel and the inner barrel are both fixedly connected with the feed hopper in a penetrating mode, water filtering holes are formed in the inner barrel, a water filtering pipe communicated with the water filtering cavity is fixedly connected to the outer barrel, and the water filtering pipe is communicated with a water filtering pool through a pipeline.

Further, still including setting up the cutter that is used for cutting the mud after the condensation on the end cover is close to barrel one side.

Further, the cutter is fixedly connected with the inner side of the barrel along the radial direction, the cutting edge of the cutter faces away from the end cover, and an adjusting screw rod used for adjusting the gap between the end cover and the barrel is arranged between the end cover and the cutter.

Further, the cutter is fixedly connected with the end cover along the radial direction, the cutting edge of the cutter faces away from the end cover, an adjusting motor used for adjusting the gap between the end cover and the barrel is fixedly arranged on the outer wall of the barrel, and an output shaft of the adjusting motor is in threaded fit with the end cover.

Further, the gravity separator is the fixed setting of slope, and it includes cylindric bearing section of thick bamboo, bearing section of thick bamboo internal seal, the bottom of bearing section of thick bamboo is equipped with the inlet pipe that leans on and the blow off pipe that leans on down, bearing section of thick bamboo top is equipped with the water purification pipe, inlet pipe, blow off pipe and water purification pipe all communicate with bearing section of thick bamboo is inside, the inlet pipe passes through the pipeline intercommunication with the drainage basin.

Further, the pressure-bearing cylinder is internally provided with a feeding cavity and a settling cavity which are mutually isolated, a radial partition plate is arranged between the feeding cavity and the settling cavity, the feeding cavity is positioned at the lower part of the pressure-bearing cylinder, the settling cavity is positioned at the upper part of the pressure-bearing cylinder, the feeding pipe is communicated with the feeding cavity, the water purifying pipe is communicated with the top of the settling cavity, the sewage draining pipe is communicated with the lowest position of the settling cavity, and the partition plate is provided with a through hole for communicating the feeding cavity with the settling cavity.

Furthermore, the sedimentation cavity is internally provided with at least one piece of grating along the radial direction, the grating is vertically and fixedly connected with the side wall of the pressure-bearing cylinder, the upper part of the grating inclines towards the direction of the water purification pipe, the sedimentation cavity comprises a sedimentation chamber above the grating and a sewage discharge chamber below the grating, the water purification pipe is communicated with the top of the sedimentation chamber, and the sewage discharge pipe is communicated with the lowest position of the sedimentation chamber.

Furthermore, a water pump is arranged on a pipeline between the gravity separator and the water filtering pool.

Further, the gravity separator is inclined at an angle of 30 to 60 degrees.

The invention has the positive effects that:

1. the invention is provided with a spiral thickener and a water filtering pool, sludge enters the spiral thickener through a feed hopper, the spiral thickener filters redundant moisture in the sludge and discharges the concentrated sludge. The filtered water flows into the filter tank through the pipeline, the sludge continuously works during concentration in the cylinder, and the concentrated sludge is continuously discharged from the space between the end cover and the cylinder, so that the working efficiency is high during sludge concentration.

2. The spiral thickener is provided with a cylinder body, a packing auger and an end cover with an adjustable gap between the opening of the cylinder body and the cylinder body. The pressure of the sludge during concentration is adjusted by adjusting the gap between the end cover and the cylinder, and the water content of the sludge is adjusted.

3. The invention is also provided with a gravity separator, and a water pump is arranged on a pipeline between the water filtering pool and the gravity separator. The drainage that contains the particulate matter in the drainage pond passes through the water pump and carries gravity separator in, under the effect of gravity, gravity separator will be through the solid particulate matter filtering of its inside aquatic, and the clear water of discharging. Because the gravity separator is internally provided with no filter screen, the gravity separator can continuously work without regular maintenance and cleaning and has high working efficiency.

Drawings

FIG. 1 is a schematic diagram of embodiment 1 and embodiment 2;

FIG. 2 is a schematic view showing the structure of a screw type thickener according to example 1;

FIG. 3 is a schematic view showing the structure of a screw concentrator in example 2;

FIG. 4 is a schematic view of the structure of a gravity separator in example 1;

FIG. 5 is a schematic view of the structure of a gravity separator in example 2;

in the figure, 1, a spiral thickener; 2. a water filtering tank; 3. a water pump; 4. a gravity separator; 5. a feed hopper; 6. a motor; 7. a water filter pipe; 8. an inner barrel; 9. a packing auger; 10. an outer cylinder; 11. an end cap; 12. adjusting a lead screw; 13. a cutter; 14. adjusting the motor; 15. a feed pipe; 16. a blow-off pipe; 17. a pressure-bearing cylinder; 18. a water purifying pipe; 19. a feed cavity; 20. a partition plate; 21. a settling chamber; 22. a grid; 23. a through hole; 24. a sewage discharge chamber.

Detailed Description

The technical scheme of the invention is clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few examples of the present application and not all examples. The following description of the embodiments is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments in the present application, are within the scope of protection of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in the embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The present invention will be further explained and illustrated with reference to the following specific embodiments and the accompanying drawings, wherein the following embodiments are only preferred embodiments, not all embodiments, and should not be construed as limiting the scope of the present invention.

Example 1

As shown in fig. 1, 2 and 4, the sludge concentration device for wastewater treatment in a thermal power plant comprises a spiral concentrator 1, a filter tank 2 for collecting filtrate of the spiral concentrator 1, and a gravity separator 4 for re-separating water and solid particles in the filtrate of the filter tank 2, wherein the spiral concentrator 1 and the gravity separator 4 are both communicated with the filter tank 2 through pipelines. Spiral thickener 1 includes the horizontal barrel of cylindrical right-hand member shutoff, transversely set up in the barrel inside and with barrel normal running fit's spiral auger 9, fixed set up at the barrel top be close to the right-hand member and with the inside feed hopper 5 that leaks hopper-shaped of communicating of barrel and set up at the barrel left end opening part and with barrel between clearance adjustable end cover 11. The round end plate at the right end of the cylinder body is fixedly connected with a motor 6 used for driving the packing auger 9 to rotate through screws, and water filtering holes are uniformly distributed in the side wall of the cylinder body.

Mud passes through feeder hopper 5 and enters into the barrel, and motor 6 drives auger 9 and rotates, and the mud that will enter into the barrel conveys left and piles up and extrude the silt of left part in the barrel, and the unnecessary moisture that extrudes flows through the drainage hole on the barrel lateral wall to make unnecessary moisture in the mud obtain the filtering. The concentrated sludge is discharged through a gap between the cylinder and the end cover 11. The filtered water flows into the water filtering pool 2 through a pipeline, and a water pump 3 is arranged on the pipeline between the water filtering pool 2 and the gravity separator 4. The water that contains the particulate matter in the drainage pond 2 passes through water pump 3 and carries in gravity separator 4, and under the effect of gravity, gravity separator 4 will be through the solid particulate matter filtering of its inside aquatic, and the clear water of discharging. The sludge continuously works when being concentrated in the cylinder, and the concentrated sludge is continuously discharged from the space between the end cover 11 and the cylinder, so the working efficiency is high.

The cylinder body is a hollow closed double-layer structure and comprises a cylindrical inner cylinder 8 and an outer cylinder 10 sleeved outside the inner cylinder 8, a gap is formed between the inner cylinder 8 and the outer cylinder 10, and the gap is a water filtering cavity. The inner cylinder 8 and the outer cylinder 10 are both welded with end plates, and a blocking plate is welded between the left end of the inner cylinder 8 and the left end of the outer cylinder 10 and is conical with a large head facing left. The outer cylinder 10 and the inner cylinder 8 are both in penetration welding with the feed hopper 5, and the water filtering holes are uniformly distributed on the inner cylinder 8. The lower part of the outer barrel 10 is welded with a strainer 7 communicated with a water filtering cavity near the right end, and the strainer 7 is communicated with the water filtering pool 2 through a pipeline.

The water filtered after the sludge is concentrated enters the water filtering cavity through the water filtering holes, is collected through the outer cylinder 10, is discharged through the water filtering pipe 7 and flows into the water filtering pool through a pipeline connected with the water filtering pipe 7.

The right side of the end cover 1 is provided with a cutter 13, the cutter 13 is in a cross shape, the cutter 13 is arranged in the inner cylinder 8 and is welded with the inner wall of the inner cylinder 8 along the radial direction, and the cutting edge of the cutter 13 is towards the right. The center of the end cover 11 transversely penetrates through and is provided with an adjusting screw rod 12, the left part of the adjusting screw rod 12 is in sliding fit with the end cover 11, and the right end of the adjusting screw rod 12 is fixedly connected with the center of the cutter 13 through threads. The end cover 11 is conical corresponding to the blocking plate, and a nut is arranged on an adjusting screw rod 12 on the left side of the end cover 11.

The gap between the end cover 11 and the cylinder body is adjusted by adjusting the position of the nut on the adjusting screw 12, so that the pressure of the sludge during concentration is adjusted, and the water content of the sludge is adjusted. The cutter 13 cuts the sludge into small pieces after the sludge is concentrated, so that the sludge can be discharged from the inside of the cylinder more easily.

The gravity separator 4 is by the left side down 45 degrees fixed settings of inclining to the right, and it includes cylindric pressure-bearing section of thick bamboo 17, the shutoff of pressure-bearing section of thick bamboo 17 both ends, be equipped with on the bottom plate of pressure-bearing section of thick bamboo 17 bottom and lean on last inlet pipe 15 and the blow off pipe 16 that leans on down. The feeding pipe 15 and the sewage discharge pipe 16 are both in through welding with the bottom plate, and the feeding pipe 15 and the sewage discharge pipe 16 are both communicated with the inside of the pressure-bearing cylinder 17. The top plate highest point at the top of the pressure bearing cylinder 17 is provided with a water purification pipe 18, the water inlet pipe 18 is in penetration welding with the top plate, the water purification pipe 18 is communicated with the inside of the pressure bearing cylinder 17, and the feed pipe 15 is communicated with a water outlet of the water pump 3.

After the water pump 3 conveys the water containing solid particles in the water filtering pool 2 to the pressure bearing cylinder 17 through the pipeline and the feeding pipe 15, the flow cross-sectional area after entering the pressure bearing cylinder 17 is increased, so that the flow speed of the water entering the pressure bearing cylinder 17 is reduced. After the velocity of flow of the inside water of pressure-bearing cylinder 17 is less than the critical settling velocity of flow of solid particulate matter, under the effect of gravity, the solid particulate matter can take place the phenomenon of subsiding in pressure-bearing cylinder 17 is inside, and the solid particulate matter in aquatic subsides downwards on pressure-bearing cylinder 17's the inner wall to slide to blow off pipe 16 through the inner wall that pressure-bearing cylinder 17 inclines, discharge pressure-bearing cylinder 17 by blow off pipe 16. The filtered clean water is discharged through a water inlet pipe 18 at the top of the pressure bearing cylinder 17 and is used for production of a power plant.

The gravity separator 4 realizes the separation of water and solid particles through the action of gravity to obtain clean water, and because the interior of the gravity separator is not provided with a filter screen, the gravity separator does not need to be regularly maintained and cleaned, can continuously work and has high working efficiency.

Example 2

As shown in fig. 1, 3 and 5, the sludge concentration device for wastewater treatment in a thermal power plant comprises a spiral concentrator 1, a filter tank 2 for collecting filtrate of the spiral concentrator 1, and a gravity separator 4 for re-separating water and solid particles in the filtrate of the filter tank 2, wherein the spiral concentrator 1 and the gravity separator 4 are both communicated with the filter tank 2 through pipelines. Spiral thickener 1 includes the horizontal barrel of cylindrical right-hand member shutoff, transversely set up in the barrel inside and with barrel normal running fit's spiral auger 9, fixed set up at the barrel top be close to the right-hand member and with the inside feed hopper 5 that leaks hopper-shaped of communicating of barrel and set up at the barrel left end opening part and with barrel between clearance adjustable end cover 11. The round end plate at the right end of the cylinder body is fixedly connected with a motor 6 used for driving the packing auger 9 to rotate through screws, and water filtering holes are uniformly distributed in the side wall of the cylinder body.

The cylinder body is a hollow closed double-layer structure and comprises a cylindrical inner cylinder 8 and an outer cylinder 10 sleeved outside the inner cylinder 8, a gap is formed between the inner cylinder 8 and the outer cylinder 10, and the gap is a water filtering cavity. The inner tube 8 and the outer tube 10 are both welded with end plates, and an annular blocking plate is welded between the left end of the inner tube 8 and the left end of the outer tube 10. The outer cylinder 10 and the inner cylinder 8 are both in penetration welding with the feed hopper 5, and the water filtering holes are uniformly distributed on the inner cylinder 8. The lower part of the outer barrel 10 is welded with a strainer 7 communicated with a water filtering cavity near the right end, and the strainer 7 is communicated with the water filtering pool 2 through a pipeline.

The end cover 1 is disc-shaped, and its right side welding has cutter 13, cutter 13 is the cross, cutter 13 radial dimension is less than the barrel internal diameter, cutter 13 cutting edge is right. The left end of the outer wall of the cylinder body is fixedly connected with two adjusting motors 14 which are arranged at intervals of 180 degrees through screws, and output shafts on the left sides of the adjusting motors 14 are in threaded fit with lugs correspondingly welded on the end covers 11.

When the adjusting motor 14 rotates, the end cover 11 is driven to move axially, so that the gap between the end cover 11 and the cylinder is adjusted, the pressure of the sludge during concentration is adjusted, and the water content of the sludge is adjusted. The cutter 13 cuts the sludge into small pieces after the sludge is concentrated, so that the sludge can be discharged from the inside of the cylinder more easily. The pressure during sludge concentration, namely the torque of the packing auger 9 can be fed back through the operating current of the motor 6, so that the pressure control during sludge concentration is realized by adjusting the gap between the end cover 11 and the cylinder body and matching with the operating current feedback of the motor 6, and further the water content of the sludge during concentration is controlled.

The pressure bearing cylinder 17 comprises a feeding cavity 19 and a settling cavity which are mutually isolated, a circular partition plate 20 is arranged between the feeding cavity 19 and the settling cavity along the radial direction, the partition plate 20 is close to the bottom of the pressure bearing cylinder 17, and the partition plate 20 is welded with the inner wall of the pressure bearing cylinder 17. The feeding cavity is positioned at the lower part of the pressure bearing cylinder 17, the settling cavity is positioned at the upper part of the pressure bearing cylinder 17, the feeding pipe 15 is communicated with the feeding cavity 19, the purified water pipe 18 is communicated with the top of the settling cavity, and the sewage discharge pipe 16 is communicated with the lowest position of the settling cavity. The clapboard 20 and the bottom plate at the bottom of the pressure-bearing cylinder 17 are both in through welding with the sewage discharge pipe 16. The baffle plate 20 is uniformly provided with through holes 23 which are used for communicating the feeding cavity 19 with the sedimentation cavity.

The sedimentation chamber is internally and uniformly provided with grids 22 along the radial direction, the grids 22 are vertically welded with the side wall of the pressure-bearing cylinder 17, the upper parts of the grids 22 are vertically arranged, the sedimentation chamber comprises a sedimentation chamber 21 above the grids 22 and a sewage discharge chamber 24 below the grids 22, the water purification pipe 18 is communicated with the top of the sedimentation chamber 21, and the sewage discharge pipe 16 is communicated with the lowest position of the sedimentation chamber 21.

After entering the feeding cavity 19, the filtered water containing solid particles enters the settling chamber 21 from the through holes along the feeding cavity 19, so that the flow of the filtered water entering the settling chamber is more stable, and the settling of the solid particles in the filtered water is facilitated. After the filtered water settles in the settling chamber, the solid particulate matter sinks through the grate 22 to the blowdown chamber 24 and is discharged through the blowdown pipe 16 with a small amount of filtered water.

The above-mentioned embodiments are described in detail and specifically for the purpose of illustrating the technical ideas and features of the present invention, and it is an object of the present invention to enable those skilled in the art to understand the contents of the present invention and to implement the same, but not to limit the present invention only by the embodiments, and it is not limited to the scope of the present invention, i.e. equivalent changes or modifications made within the spirit of the present invention, and it is within the scope of the present invention for those skilled in the art to make local modifications within the system and changes or modifications between subsystems without departing from the structure of the present invention.

Claims

1. The sludge concentration device for the wastewater treatment of the thermal power plant is characterized by comprising a spiral concentrator (1), a water filtering pool (2) for collecting filtrate of the spiral concentrator (1) and a gravity separator (4) for separating solid and liquid in the water filtering pool (2) again, wherein the spiral concentrator (1) and the gravity separator (4) are communicated with the water filtering pool (2) through pipelines; spiral concentrated machine (1) include the horizontal barrel of columniform one end shutoff, transversely set up in the barrel and with barrel normal running fit's auger (9), fixed set up at the barrel top and with inside feed hopper (5) and the setting of intercommunication of barrel between barrel opening side and the barrel between clearance adjustable end cover (11), the barrel is fixed in one side relative with end cover (11) and is provided with and is used for driving auger (9) pivoted motor (6), be equipped with the drainage hole on the lateral wall of barrel.

2. The sludge concentration device for wastewater treatment of a thermal power plant according to claim 1, wherein the cylinder body is a hollow closed double-layer structure and comprises an inner cylinder (8) and an outer cylinder (10) sleeved outside the inner cylinder (8), a gap is formed between the inner cylinder (8) and the outer cylinder (10), the gap is a water filtering cavity, the outer cylinder (10) and the inner cylinder (8) are fixedly connected with a feed hopper (5) in a penetrating manner, the water filtering holes are formed in the inner cylinder (8), a water filtering pipe (7) communicated with the water filtering cavity is fixedly connected to the outer cylinder (10), and the water filtering pipe (7) is communicated with the water filtering pool (2) through a pipeline.

3. The thermal power plant wastewater treatment sludge concentrating device according to claim 1, further comprising a cutter (13) arranged on one side of the end cover (11) close to the cylinder body and used for cutting concentrated sludge.

4. The thermal power plant wastewater treatment sludge concentration device according to claim 3, wherein the cutting knife (13) is fixedly connected with the inner side of the cylinder along the radial direction, the cutting edge of the cutting knife (13) is back to the end cover (11), and an adjusting screw rod (12) for adjusting the gap between the end cover (11) and the cylinder is arranged between the end cover (11) and the cutting knife (13).

5. The thermal power plant wastewater treatment sludge concentration device according to claim 3, wherein the cutting knife (13) is fixedly connected with the end cover (11) along a radial direction, a cutting edge of the cutting knife (13) faces away from the end cover (11), an adjusting motor (14) for adjusting a gap between the end cover (11) and the barrel is fixedly arranged on the outer wall of the barrel, and an output shaft of the adjusting motor (14) is in threaded fit with the end cover (11).

6. The thermal power plant wastewater treatment sludge concentration device according to claim 1, wherein the gravity separator (4) is obliquely and fixedly arranged and comprises a cylindrical pressure bearing cylinder (17), the pressure bearing cylinder (17) is internally sealed, the bottom of the pressure bearing cylinder (17) is provided with an upper feeding pipe (15) and a lower draining pipe (16), the top of the pressure bearing cylinder (17) is provided with a water purifying pipe (18), the feeding pipe (15), the draining pipe (16) and the water purifying pipe (18) are all communicated with the inside of the pressure bearing cylinder (17), and the feeding pipe (15) is communicated with the water filtering pond (2) through a pipeline.

7. The thermal power plant wastewater treatment sludge concentration device according to claim 6, wherein the pressure bearing cylinder (17) comprises a feeding cavity (19) and a settling cavity which are isolated from each other inside, a radial partition plate (20) is arranged between the feeding cavity (19) and the settling cavity, the feeding cavity (19) is positioned at the lower part of the pressure bearing cylinder (17), the settling cavity is positioned at the upper part of the pressure bearing cylinder (17), the feeding pipe (15) is communicated with the feeding cavity (19), the clear water pipe (18) is communicated with the top of the settling cavity, the drain pipe (16) is communicated with the lowest position of the settling cavity, and a through hole (23) for communicating the feeding cavity (19) with the settling cavity is formed in the partition plate (20).

8. The thermal power plant wastewater treatment sludge concentration device according to claim 7, wherein at least one grid (22) is arranged in the settling chamber along the radial direction, the grids (22) are vertically and fixedly connected with the side wall of the pressure-bearing cylinder (17), the upper parts of the grids (22) incline towards the direction of the water purification pipe (18), the settling chamber comprises a settling chamber (21) above the grids (22) and a sewage discharge chamber (24) below the grids (22), the water purification pipe (18) is communicated with the top of the settling chamber (21), and the sewage discharge pipe (16) is communicated with the lowest position of the settling chamber (21).

9. The thermal power plant wastewater treatment sludge concentration device according to claim 1, wherein a water pump (3) is arranged on a pipeline between the gravity separator (4) and the water filtering pool (2).

10. The thermal power plant wastewater treatment sludge concentrating device according to claim 6, wherein the inclination angle of the gravity separator (4) is 30-60 degrees.