Fine slag recovery treatment system

Abstract

The utility model belongs to the technical field of coal-based waste treatment, and discloses a fine slag recovery treatment system which comprises a settling tank and a black water buffer device, and the black water buffer device comprises a settling tank substrate pump, a black water buffer tank and a filter press feeding pump; a suction inlet of the settling tank substrate pump is communicated with the settling tank through a pipeline, a discharge port of the settling tank substrate pump is communicated with the black water buffer tank through a pipeline, and a suction inlet of the filter press feeding pump is communicated with the black water buffer tank through a pipeline; the filter pressing device comprises a filter press, a squeezing water tank, a squeezing water pump and a compressed air tank; a suction inlet of the squeezing water pump is communicated with the squeezing water tank through a pipeline, a discharge port of the squeezing water pump is communicated with the filter press through a pipeline, the squeezing water tank is connected with a desalted water pipe network, the compressed air tank is communicated with the filter press through a pipeline, and a discharge port of the feed pump of the filter press is communicated with the filter press through a pipeline; the utility model solves the problem that the water content of the existing fine slag filter cake is higher.

Description

Technical Field

[0001] This solution belongs to the technical field of coal-based waste treatment, and specifically relates to a fine slag recovery and treatment system. Background Art

[0002] Reference is made to the existing publication (announcement) number CN108456555A, which discloses a novel continuous slag discharge gasification process and a novel entrained-flow gasification device. Currently, due to my country's energy reserves being characterized by "lack of oil, limited gas, and abundant coal," the application of coal in the energy and chemical industries is gaining increasing attention. Producing coal gas through coal gasification is a clean and efficient way to utilize coal.

[0003] The water-coal slurry gasification process is a widely used method for solid-liquid separation of black water (10% solids content) from the gasification slag water treatment stage. Currently, a vacuum belt filter is used to dehydrate the fine slag. The process involves piping the black water (containing approximately 10% fine slag) from the gasification slag water treatment stage into the filter. A vacuum pump extracts the water from the black water through a filter cloth, leaving the fine slag on the filter cloth. Fine slag, a solid waste generated during the gasification process, has a high carbon content, a well-developed porous structure, strong water absorption, and high yield. After drying, the residual carbon content in the fine slag reaches 25%-35%, making it highly valuable for recycling.

[0004] However, when using vacuum belt filtration, if the solid particle content in the filter residue water is low, the vacuum zone length is constant, resulting in the filtrate not being fully filtered, resulting in a high water content in the filter cake. The dried fine residue has a water content of approximately 70%, resulting in a high water content in the filter cake. During loading and transportation, a large amount of water precipitates from the filter cake, causing serious water leakage in the vehicle. Furthermore, transportation in winter can easily cause road icing, posing a safety hazard to road transportation. Furthermore, in existing fine residue processing processes, after the fine residue is dehydrated using a vacuum belt filtration device, it is transported by truck to a raw coal yard for drying, where it is then mixed with raw coal for reuse in power plants and boilers. However, when the filter cake freezes in winter, it cannot be mixed with fuel coal for power plants and boilers, affecting normal production. Utility Model Content

[0005] The purpose of this solution is to provide a fine slag recovery and processing system to reduce the problem of high water content in the existing fine slag filter cake.

[0006] In order to achieve the above objectives, the present invention provides a fine slag recovery and processing system, including a sedimentation tank and:

[0007] A black water buffer device, comprising a sedimentation tank bottom pump, a black water buffer tank, and a filter press feed pump; the suction port of the sedimentation tank bottom pump is connected to the sedimentation tank through a pipeline, the discharge port of the sedimentation tank bottom pump is connected to the black water buffer tank through a pipeline, and the suction port of the filter press feed pump is connected to the black water buffer tank through a pipeline;

[0008] A filter press device, comprising a filter press, a squeeze water tank, a squeeze water pump and a compressed air tank; the suction port of the squeeze water pump is connected to the squeeze water tank through a pipeline, the discharge port of the squeeze water pump is connected to the filter press through a pipeline, the squeeze water tank is connected to a desalted water network, the compressed air tank is connected to the filter press through a pipeline, and the discharge port of the filter press feed pump is connected to the filter press through a pipeline.

[0009] Furthermore, the filter press is connected to a filter press return pipeline cut-off valve and a filter press filtrate valve via a pipeline.

[0010] Furthermore, the filter press device also includes a filter cloth cleaning water pump and a filter cloth cleaning water tank. The suction port of the filter cloth cleaning water pump is connected to the filter cloth cleaning water tank through a pipe, and the discharge port of the filter cloth cleaning water pump is connected to the filter press through a pipe. The filter cloth cleaning water tank is connected to the desalted water pipeline network.

[0011] Furthermore, a filter cloth cleaning water replenishment valve is provided on the desalted water pipe network connected to the filter cloth cleaning water tank, a filter cloth cleaning water outlet valve is provided on the pipe connecting the filter cloth cleaning water pump and the filter cloth cleaning water tank, and a filter cloth cleaning water pump reflux valve is connected to the pipe connecting the filter cloth cleaning water pump and the filter cloth cleaning water tank through a first branch pipe, and the discharge outlet of the first branch pipe is connected to the filter cloth cleaning water tank.

[0012] Furthermore, a sedimentation tank ash rake is provided in the sedimentation tank, a second branch pipe is connected to the pipe connecting the sedimentation tank bottom pump and the sedimentation tank, and the second branch pipe is connected to the fresh water network; the black water buffer tank is connected to the fresh water network; the pipe connecting the black water buffer tank and the filter press feed pump is connected to the fresh water network.

[0013] Furthermore, a first filter press feed pump outlet valve is provided on the pipeline connecting the filter press feed pump and the filter press, a third branch pipe is connected to the pipeline connecting the filter press feed pump and the filter press, the end of the third branch pipe is connected to the black water buffer tank, and a second filter press feed pump outlet valve is provided on the third branch pipe.

[0014] Furthermore, a compressed air to filter press valve is provided on the pipeline connecting the compressed air tank and the filter press, a fourth branch pipe is connected to the pipeline connecting the compressed air tank and the filter press, the end of the fourth branch pipe is connected to the filter press, and a compressed air to filter press valve and a compressed air to filter press filtrate pipeline valve are provided on the fourth branch pipe.

[0015] Furthermore, the squeeze water tank is connected to a water supply pipe, the water supply pipe is provided with a squeeze water supply valve, and the pipe connecting the squeeze water pump and the filter press is provided with a squeeze water pump outlet valve.

[0016] Furthermore, it also includes a filtrate recovery device, which includes a filtrate tank and a filtrate tank stirring member. The filtrate tank stirring member is arranged in the filtrate tank. The filtrate tank is connected to the filter press feed pump through a pipeline. The discharge outlet of the filter press feed pump is connected to the filter press through a pipeline.

[0017] Furthermore, it also includes a fine slag transfer trestle device, which includes a forward and reverse belt and a first electro-hydraulic three-way valve, the first electro-hydraulic three-way valve is arranged below one end of the forward and reverse belt, a slag bin conveying belt is provided below the first electro-hydraulic three-way valve, a second electro-hydraulic three-way valve is provided below the other end of the forward and reverse belt, a fine slag conveying belt is provided below the second electro-hydraulic three-way valve, a slag conveying belt is provided below the fine slag conveying belt, and a fine slag transfer belt is provided below the slager.

[0018] The principle and effect of this scheme are as follows: (1) The bottom fine residue is pressurized by the sedimentation tank bottom pump and sent to the black water buffer tank of the filter press plant, and then sent to five plate and frame filter presses for filtration through the filter press feed pump. The filtrate flows into the filtrate tank by gravity, and returns to the sedimentation tank for circulation after being pressurized by the filtrate pump. The filter cake passes through the forward and reverse belts. Under normal working conditions, the forward and reverse belts rotate forward through the first electro-hydraulic three-way valve, the fine residue conveying belt, and the scatterer, and then enter the fine residue transfer belt and are transported to the boiler fine residue silo; when the boiler or the fine residue trestle is abnormal, the forward and reverse belts reverse through the first electro-hydraulic three-way valve, the slag silo conveying belt, the fine residue silo, and then go to the car for loading and transportation. (2) The feed and feed of the filter press are controlled by the outlet valve of the first filter press feed pump and the reflux valve of the filter press feed pump. (3) The filtrate after filtration is transported to the sedimentation tank for reuse through the filtrate pump flow meter. If the filtration is abnormal or unqualified, it will be returned to the black water buffer tank through the filtrate and waste residue return valve. (4) The liquid level of the squeeze water tank is controlled by the squeeze water replenishment valve, the squeeze water pump outlet valve controls the squeeze water tank to replenish the filter press, and the reflux valve controls the pump reflux during the pause period. (5) The liquid level of the filter cloth cleaning water tank is controlled by the filter cloth cleaning water replenishment valve, the filter cloth cleaning water outlet valve controls the flushing of the filter press filter cloth, and the filter cloth cleaning water pump reflux valve controls normal reflux. (6) The filter press and pipeline are purged through the control valve. The filter press itself, through operation, presses the fine residue to achieve solid-liquid separation. (7) By controlling the forward and reverse rotation of the belt, it is determined whether the fine slag is transported to the slag bin for transportation or transported to the boiler for co-firing. The electro-hydraulic three-way valve is used to control the main belt or spare belt for the conveying belt to the slag bin and the fine slag conveying belt. The fine slag sent to the fluidized bed boiler for co-firing is dispersed by the disperser to facilitate feeding and avoid bridging of the boiler slag bin. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a fine slag recovery and processing system of the utility model.

[0020] The names of the corresponding marks in the accompanying drawings are: sedimentation tank 1, sedimentation tank ash rake 11, black water buffer device 2, sedimentation tank bottom pump 21, black water buffer tank 22, filter press feed pump 23, first filter press feed pump outlet valve 24, filter press device 3, filter press 31, filter press return pipeline shut-off valve 311, filter press filtrate valve 312, squeeze water tank 32, squeeze water replenishment valve 321, squeeze water pump outlet valve 322, squeeze water pump 33, compressed air tank 34, filter cloth cleaning water pump 35, filter cloth cleaning water tank 36, filter cloth cleaning Water replenishment valve 361, filter cloth cleaning water outlet valve 362, filter cloth cleaning water pump reflux valve 363, compressed air to filter press valve 37, compressed air to filter press valve 38, compressed air to filter press filtrate pipeline valve 39, filtrate recovery device 4, filtrate tank 41, filtrate tank stirring element 42, filter press feed pump 43, fine slag transfer trestle device 5, forward and reverse belt 51, first electro-hydraulic three-way valve 52, second electro-hydraulic three-way valve 53, slag bin conveying belt 54, fine slag conveying belt 55, scatterer 56, fine slag transfer belt 57. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the concept and technical effects of the present invention in conjunction with the embodiments, so that the purpose, features and effects of the present invention can be fully understood. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention:

[0022] Example:

[0023] See also Figure 1 ,

[0024] A fine slag recovery and processing system includes a sedimentation tank 1, in which a sedimentation tank ash rake 11 is provided, and also includes a black water buffer device 2, which includes a sedimentation tank bottom pump 21, a black water buffer tank 22 and a filter press feed pump 23; the suction port of the sedimentation tank bottom pump 21 is connected to the sedimentation tank 1 through a pipeline, the discharge port of the sedimentation tank bottom pump 21 is connected to the black water buffer tank 22 through a pipeline, the suction port of the filter press feed pump 23 is connected to the black water buffer tank 22 through a pipeline, the pipeline connecting the sedimentation tank bottom pump 21 and the sedimentation tank 1 is connected to a second tributary pipe, the second tributary pipe is connected to a fresh water network, the black water buffer tank 22 is connected to the fresh water network; the pipeline connecting the black water buffer tank 22 and the filter press feed pump 23 is connected to the fresh water network.

[0025] The filter press device 3 also includes a filter press 3, which includes a filter press 31, a squeeze water tank 32, a squeeze water pump 33 and a compressed air tank 34; the suction port of the squeeze water pump 33 is connected to the squeeze water tank 32 through a pipeline, and the discharge port of the squeeze water pump 33 is connected to the filter press 31 through a pipeline, the squeeze water tank 32 is connected to the desalted water pipe network, the squeeze water tank 32 is connected to a water supply pipeline, a squeeze water supply valve 321 is provided on the water supply pipeline, a squeeze water pump outlet valve 322 is provided on the pipeline connecting the squeeze water pump 33 and the filter press 31, the compressed air tank 34 is connected to the filter press 31 through a pipeline, a compressed air to filter press valve 37 is provided on the pipeline connecting the compressed air tank 34 and the filter press 31, and the compressed air tank 34 is connected to the filter press 31. A fourth branch pipe is connected to the connected pipeline, and the end of the fourth branch pipe is connected to the filter press 31. The fourth branch pipe is provided with a compressed air to filter press valve 38 and a compressed air to filter press filtrate pipeline valve 39. The discharge outlet of the filter press feed pump 23 is connected to the filter press 31 through a pipeline. The first filter press feed pump outlet valve 24 is provided on the pipeline connecting the filter press feed pump 23 and the filter press 31. The third branch pipe is connected to the pipeline connecting the filter press feed pump 23 and the filter press 31. The end of the third branch pipe is connected to the black water buffer tank 22. The second filter press feed pump outlet valve 25 is provided on the third branch pipe. The filter press 31 is connected to the filter press return pipeline cut-off valve 311 and the filter press filtrate valve 312 through a pipeline.

[0026] The filter press device 3 also includes a filter cloth cleaning water pump 35 and a filter cloth cleaning water tank 36. The suction port of the filter cloth cleaning water pump 35 is connected to the filter cloth cleaning water tank 36 through a pipe, and the discharge port of the filter cloth cleaning water pump 35 is connected to the filter press 31 through a pipe. The filter cloth cleaning water tank 36 is connected to the desalted water pipe network. The desalted water pipe network connected to the filter cloth cleaning water tank 36 is provided with a filter cloth cleaning water replenishment valve 361. The pipe connecting the filter cloth cleaning water pump 35 and the filter cloth cleaning water tank 36 is provided with a filter cloth cleaning water outlet valve 362. The pipe connecting the filter cloth cleaning water pump 35 and the filter cloth cleaning water tank 36 is connected to a filter cloth cleaning water pump reflux valve 363 through a first branch pipe. The discharge port of the first branch pipe is connected to the filter cloth cleaning water tank 36.

[0027] It also includes a filtrate recovery device 4, which includes a filtrate tank 41 and a filtrate tank stirring member 42. The filtrate tank stirring member 42 is arranged in the filtrate tank 41. The filtrate tank 41 is connected to a filter press feed pump 43 through a pipeline. The discharge outlet of the filter press feed pump 43 is connected to the filter press 31 through a pipeline.

[0028] It also includes a fine slag transfer trestle device 5, which includes a forward and reverse belt 51 and a first electro-hydraulic three-way valve 52. The first electro-hydraulic three-way valve 52 is arranged below one end of the forward and reverse belt 51, and a slag bin conveying belt 54 is provided below the first electro-hydraulic three-way valve 52. A second electro-hydraulic three-way valve 53 is provided below the other end of the forward and reverse belt 51, and a fine slag conveying belt 55 is provided below the second electro-hydraulic three-way valve 53. A slag scatterer 56 is provided below the fine slag conveying belt 55, and a fine slag transfer belt 57 is provided below the scatterer 56.

[0029] The working conditions of this fine slag recovery and treatment system are as follows:

[0030] First, the fine residue at the bottom is pressurized by sedimentation tank substrate pump 21 and sent to the black water buffer tank 22 in the filter press building. It is then fed to five plate and frame filter presses 3 by filter press feed pumps 43 for filtration. The filtrate flows by gravity into the filtrate tank, is pressurized by the filtrate pump, and returns to sedimentation tank 1 for recirculation. The filter cake passes through forward and reverse conveyors 51.

[0031] Under normal circumstances, the forward and reverse belt 51 rotates forward, passes through the first electro-hydraulic three-way valve 52, the fine slag conveying belt 55, and the slag breaker 56, and then enters the fine slag transfer belt 55 for transportation to the boiler fine slag silo. If the boiler or the fine slag trestle malfunctions, the forward and reverse belt 51 rotates backward, passes through the first electro-hydraulic three-way valve 52, the slag silo conveying belt 54, and the fine slag silo, and then is loaded onto a truck for transportation.

[0032] The functions of the valves on the pipelines of this system are as follows:

[0033] The first filter press feed pump outlet valve 24 and the filter press feed pump return valve control the feed and shutoff of the filter press. The filtrate pump flowmeter regulates the flow of filtered filtrate, which is then transferred to the sedimentation tank 1 for reuse. If the filtration is abnormal or unsatisfactory, the filtrate is returned to the black water buffer tank 22 via the filtrate and waste residue return valve. The press water replenishment valve 321 controls the liquid level in the press water tank 32. The press water pump outlet valve 322 controls the replenishment of press water from the press water tank 32 into the filter press 31. The return valve controls the pump's return flow during pauses. The filter cloth wash water replenishment valve 361 controls the liquid level in the filter cloth wash water tank 36. The filter cloth wash water outlet valve 362 controls filter cloth flushing in the filter press 31. The filter cloth wash water pump return valve 363 controls normal return flow. The filter press 31 and pipelines are purged using control valves. The filter press 31 itself, through operation, filters the fine residue to achieve solid-liquid separation. By controlling the forward and reverse rotation belt 51, it is determined whether the fine slag is transported to the slag bin vehicle or transported to the boiler for co-combustion. The first electro-hydraulic three-way valve 52 is used to control whether the main belt or the spare belt for transporting to the slag bin conveying belt 54 and the fine slag conveying belt 55 is transported. The fine slag sent to the fluidized bed boiler for co-combustion is dispersed by the disperser 56 to facilitate feeding and avoid bridging of the boiler slag bin.

[0034] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A fine slag recovery and processing system, comprising a sedimentation tank (1), characterized in that: Also includes: A black water buffer device (2), the black water buffer device (2) comprising a sedimentation tank bottom pump (21), a black water buffer tank (22) and a filter press feed pump (23); the suction port of the sedimentation tank bottom pump (21) is connected to the sedimentation tank (1) through a pipeline, the discharge port of the sedimentation tank bottom pump (21) is connected to the black water buffer tank (22) through a pipeline, and the suction port of the filter press feed pump (23) is connected to the black water buffer tank (22) through a pipeline; A filter press device (3) includes a filter press (31), a squeeze water tank (32), a squeeze water pump (33) and a compressed air tank (34); the suction port of the squeeze water pump (33) is connected to the squeeze water tank (32) through a pipeline, the discharge port of the squeeze water pump (33) is connected to the filter press (31) through a pipeline, the squeeze water tank (32) is connected to a desalted water pipe network, the compressed air tank (34) is connected to the filter press (31) through a pipeline, and the discharge port of the filter press feed pump (23) is connected to the filter press (31) through a pipeline.

2. The fine slag recovery and processing system according to claim 1, characterized in that: The filter press (31) is connected to a filter press return pipeline cut-off valve (311) and a filter press filtrate valve (312) via a pipeline.

3. The fine slag recovery and processing system according to claim 2, characterized in that: The filter press device (3) further comprises a filter cloth cleaning water pump (35) and a filter cloth cleaning water tank (36); the suction port of the filter cloth cleaning water pump (35) is connected to the filter cloth cleaning water tank (36) through a pipeline; the discharge port of the filter cloth cleaning water pump (35) is connected to the filter press (31) through a pipeline; and the filter cloth cleaning water tank (36) is connected to a desalted water pipe network.

4. The fine slag recovery and processing system according to claim 3, characterized in that: A filter cloth cleaning water replenishing valve (361) is provided on the desalted water pipe network connected to the filter cloth cleaning water tank (36), a filter cloth cleaning water outlet valve (362) is provided on the pipe connecting the filter cloth cleaning water pump (35) and the filter cloth cleaning water tank (36), and a filter cloth cleaning water pump reflux valve (363) is connected to the pipe connecting the filter cloth cleaning water pump (35) and the filter cloth cleaning water tank (36) via a first branch pipe, and the discharge outlet of the first branch pipe is in communication with the filter cloth cleaning water tank (36).

5. The fine slag recovery and processing system according to claim 4, characterized in that: The sedimentation tank (1) is provided with a sedimentation tank ash rake (11); the pipeline connecting the sedimentation tank bottom pump (21) and the sedimentation tank (1) is connected to a second branch pipe, and the second branch pipe is connected to a fresh water network; the black water buffer tank (22) is connected to a fresh water network; and the pipeline connecting the black water buffer tank (22) and the filter press feed pump (23) is connected to a fresh water network.

6. The fine slag recovery and processing system according to claim 5, characterized in that: A first filter press feed pump outlet valve (24) is provided on the pipeline connecting the filter press feed pump (23) and the filter press (31), a third branch pipe is connected to the pipeline connecting the filter press feed pump (23) and the filter press (31), the end of the third branch pipe is communicated with the black water buffer tank (22), and a second filter press feed pump outlet valve (25) is provided on the third branch pipe.

7. The fine slag recovery and processing system according to claim 6, characterized in that: A compressed air to filter press valve (37) is provided on the pipeline connecting the compressed air tank (34) and the filter press (31), a fourth branch pipe is connected to the pipeline connecting the compressed air tank (34) and the filter press (31), the end of the fourth branch pipe is communicated with the filter press (31), and a compressed air to filter press valve (38) and a compressed air to filter press filtrate pipeline valve (39) are provided on the fourth branch pipe.

8. The fine slag recovery and processing system according to claim 7, characterized in that: The squeeze water tank (32) is connected to a water supply pipe, on which a squeeze water supply valve (321) is provided. The squeeze water pump (33) is connected to the filter press (31) through a pipe provided with a squeeze water pump outlet valve (322).

9. The fine slag recovery and processing system according to claim 8, characterized in that: The invention also includes a filtrate recovery device (4), the filtrate recovery device (4) including a filtrate tank (41) and a filtrate tank stirring member (42), the filtrate tank stirring member (42) being arranged in the filtrate tank (41), the filtrate tank (41) being connected to a filter press feed pump (43) via a pipeline, and the discharge port of the filter press feed pump (43) being communicated with the filter press (31) via a pipeline.

10. The fine slag recovery and processing system according to claim 9, characterized in that: The invention also includes a fine slag transfer trestle device (5), wherein the fine slag transfer trestle device (5) includes a forward and reverse belt (51) and a first electro-hydraulic three-way valve (52), the first electro-hydraulic three-way valve (52) is arranged below one end of the forward and reverse belt (51), a slag bin conveying belt (54) is arranged below the first electro-hydraulic three-way valve (52), a second electro-hydraulic three-way valve (53) is arranged below the other end of the forward and reverse belt (51), a fine slag conveying belt (55) is arranged below the second electro-hydraulic three-way valve (53), a scatterer (56) is arranged below the fine slag conveying belt (55), and a fine slag transfer belt (57) is arranged below the scatterer (56).

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