Coal-containing wastewater treatment and recycling system

Abstract

The utility model discloses a coal-containing wastewater treatment and recycling system, and belongs to the technical field of coal-containing wastewater. According to the technical scheme, the coal-containing wastewater treatment and recycling system comprises a coal water clarification tank, the coal water clarification tank is connected with a coal conveying trestle and a coal yard spraying pipeline through a first conveying pipeline, and the first conveying pipeline is connected with a conveying pump; the conveying pipeline I is connected with a concentration tank; the concentration tank is respectively connected with a buffer tank and an external dehydration system through pipelines; the conveying pipeline II is connected with a distribution pool; the distribution pool is connected with a coal water inlet pipeline; the concentration tank is provided with a spray water inlet, coal water inlets, a water outlet and a slag outlet, the spray water inlet is formed in the top of a concentration tank body and connected with a spray water inlet pipeline, the coal water inlet pipeline is provided with a plurality of branch pipelines, and the branch pipelines correspond to the coal water inlets. According to the utility model, excessive coal-water mixture is led to the concentration tank with lower height, so that the resistance of the pipeline is reduced, and the problems of pressure building and leakage of the delivery pump are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal-containing wastewater, and in particular relates to a coal-containing wastewater treatment and reuse system. Background Art

[0002] The fuel workshop of a thermal power plant is responsible for unloading, storing, transporting, blending, crushing, removing impurities from coal, removing ash and slag, and needs to keep the production and working environment clean at all times. To keep the coal transportation system and coal yard clean, water is currently used to flush the ground for sanitation cleaning. The wastewater after flushing is collected in a coal-water clarifier for temporary storage. After three levels of sedimentation, the upper clear water is used for belt flushing and recycling, and part of it is discharged in compliance with standards. The lower sediment is regularly cleaned and transported back to the coal yard for mixing and burning.

[0003] As the equipment has been in operation for a long time, the water pipeline has corroded and thinned, and the coal conveyor trestle is located at a high position, causing pipeline leakage and pressure buildup in the conveying pump. In addition, with the strengthening of national environmental protection requirements, the suspended matter and coal slag solids in the drainage of the coal-water clarifier cannot meet the emission standards, resulting in the inability to discharge the stored water. Utility Model Content

[0004] The utility model provides a coal-containing wastewater treatment and reuse system, which guides excess coal-water mixture to a low-height concentration tank, reduces pipeline resistance, and solves the problems of pressure buildup and leakage in the delivery pump; at the same time, the concentration tank is used to separate slag and water, and the upper clear water enters the buffer tank through a dedicated pipeline as replenishment water, and the lower ash and other sediments enter the original dehydration system for subsequent treatment, thereby achieving the purpose of wastewater reuse and zero discharge.

[0005] The technical solution of the utility model is:

[0006] Coal-containing wastewater treatment and reuse system, including a coal water clarifying tank. The coal water clarifying tank is connected to the coal conveying trestle and the coal yard spraying pipeline through a first conveying pipeline, and a conveying pump is connected to the first conveying pipeline; the first conveying pipeline is connected to a thickening tank through a second conveying pipeline, and the thickening tank is respectively connected to a buffer tank and an external dewatering system through pipelines; the second conveying pipeline is connected to a distribution tank; the distribution tank is connected to a coal water inlet pipeline through a pipeline; the thickening tank includes a thickening tank body, and the thickening tank body is provided with a spray water inlet, a coal water inlet, a water outlet and a slag outlet. The coal water inlet is connected to the coal water inlet pipeline, the slag outlet is connected to the external dewatering system through a slag discharge pipeline, and the pipeline connected to the water outlet has two branches. One branch is connected to the spray water inlet, and the other branch is connected to the buffer tank. The spray water inlet is arranged at the top of the thickening tank body. The spray water inlet is connected to a spray water inlet pipeline, and a spray pump is arranged on the spray water inlet pipeline. The spray water inlet pipeline is connected with a plurality of spray heads; the coal water inlet pipeline is provided with a plurality of branch pipelines, and the plurality of branch pipelines are correspondingly arranged with a plurality of coal water inlets. The plurality of coal water inlets are arranged on the left side of the thickening tank body from top to bottom in sequence; the bottom of the thickening tank body is bowl-shaped; the thickening tank body is provided with a stirring mechanism, and the stirring mechanism includes a fixing frame and a motor. The fixing frame is fixedly arranged on the thickening tank body, the motor is fixedly connected to the top of the fixing frame, the bottom end of the motor is connected to a rotating shaft through a coupling, and the rotating shaft is connected with a stirring paddle; a sewage scraping plate is connected to the bottom of the rotating shaft.

[0007] Preferably, the sewage scraping plate includes two symmetrically arranged sewage scraping support plates. The sewage scraping support plates are fixedly arranged at the bottom of the rotating shaft, and a sewage scraping brush is arranged at one end of the sewage scraping support plate far away from the rotating shaft.

[0008] Preferably, a slag discharge valve is arranged on the slag discharge pipeline.

[0009] Preferably, the surface of the spray head is provided with a number of water spraying holes, and a spray channel is arranged inside the spray head, and the spray channel communicates with the water spraying holes.

[0010] Preferably, an adjusting part is arranged at one end of the spray channel close to the water spraying hole, and the aperture of the adjusting part decreases sequentially from the end far away from the water spraying hole to the end close to the water spraying hole.

[0011] Preferably, a flared opening is arranged at one end of the coal water inlet far away from the coal water inlet pipeline, a grid plate is arranged at the orientation position of the flared opening in the thickening tank body, and metal wires are arranged on the grid plate.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The utility model diverts the excessive coal-water mixture to a thickener with a lower height, reducing the pipeline resistance and solving the problems of pump pressure build-up and leakage of the conveying pump. At the same time, the thickener is used to separate slag from water. The upper clear water enters the buffer tank through a special pipeline as make-up water, and the lower sediment such as ash slag enters the original dewatering system for subsequent treatment, thereby achieving the purpose of wastewater reuse and zero discharge.

[0014] 2. The distribution tank can temporarily store the coal-water mixture and then enter the coal-water inlet pipeline. The coal-water inlet pipeline is provided with multiple branch pipelines, which can disperse the flow rate into the sewage tank, avoiding excessive impact load on the thickener. At the same time, it can make the coal-water mixture evenly distributed in the thickener, which helps to maintain the stability of the treatment system. If a certain pipeline needs to be repaired or replaced, the other pipelines can still work, and the entire system will not stop operating, improving the treatment efficiency.

[0015] 3. The spray water inlet pipeline and the spray head can reuse the preliminarily precipitated coal-water for flushing the coal slag, further flushing the thickener. The regulating part is arranged so that when the coal-water enters the regulating part, the water pressure is further increased due to the sudden decrease in the aperture, enhancing the flushing effect.

[0016] 4. The bottom of the thickener is bowl-shaped, with a small bottom area and a large top area. This makes the pressure on the bottom large due to the accumulation on the top. The scraping plate rotates slowly, and the scraping support plate can stir the coal slag at the bottom of the thickener, avoiding the problem of coal slag accumulation at the slag outlet. The scraping brush can scrape the coal slag attached to the side wall of the thickener, achieving further cleaning. Description of the Drawings

[0017] Figure 1 is the structural schematic diagram of the utility model.

[0018] Figure 2 is the structural schematic diagram of the thickener of the utility model.

[0019] Figure 3 is the structural schematic diagram of the spray head of the utility model.

[0020] In the figure, 1 is a coal-water clarifying tank; 2 is the first conveying pipeline; 201 is a conveying pump; 3 is a coal conveying trestle and a coal yard spray pipeline; 4 is the second conveying pipeline; 5 is a thickening tank; 501 is the main body of the thickening tank; 502 is a spray water inlet; 503 is a coal-water inlet; 504 is a water outlet; 505 is a slag outlet; 506 is a slag discharge pipeline; 507 is a slag discharge valve; 508 is a spray water inlet pipeline; 509 is a spray head; 5091 is a water spray hole; 5092 is a spray channel; 5093 is an adjusting part; 6 is a buffer tank; 7 is an external dehydration system; 8 is a distribution tank; 9 is a coal-water inlet pipeline; 1001 is a fixing frame; 1002 is a motor; 1003 is a rotating shaft; 1004 is a stirring paddle; 1006 is a scraping support plate; 1007 is a scraping brush; 11 is a grille plate. Detailed implementation mode

[0021] In order to enable those skilled in the art to better understand the technical solutions in this utility model, the following will clearly and completely describe the technical solutions in the embodiments of this utility model with reference to the accompanying drawings in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all of the embodiments. Based on the embodiments in this utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this utility model.

[0022] Embodiment 1

[0023] As Figures 1-3 shown, this embodiment provides a coal-containing wastewater treatment and reuse system, including a coal-water clarifying tank 1. The coal-water clarifying tank 1 is connected to a coal conveying trestle and a coal yard spray pipeline 3 through the first conveying pipeline 2, and a conveying pump 201 is connected to the first conveying pipeline 2; the first conveying pipeline 2 is connected to a thickening tank 5 through the second conveying pipeline 4, and the thickening tank 5 is respectively connected to a buffer tank 6 and an external dehydration system 7 through pipelines;

[0024] The second conveying pipeline 4 is connected to a distribution tank 8; the distribution tank 8 is connected to a coal-water inlet pipeline 9 through a pipeline;

[0025] The thickening tank 5 includes a thickening tank body 501. The thickening tank body 501 is provided with a spray water inlet 502, a coal-water inlet 503, a water outlet 504 and a slag outlet 505. The coal-water inlet 503 is connected to a coal-water inlet pipeline 9. The slag outlet 505 is connected to an external dehydration system 7 through a slag discharge pipeline 506. One end of the coal-water inlet 503 away from the coal-water inlet pipeline 9 is provided with a flared opening to increase the outflow area of the coal-water. A grille plate 11 is arranged at the orientation position of the flared opening in the thickening tank body 501. Metal wires are arranged on the grille plate 11. A cleaning opening is arranged on the side wall of the thickening tank body 501, and the suspended matter on the grille plate can be cleaned regularly; a slag discharge valve 507 is arranged on the slag discharge pipeline 506. The pipeline connected to the water outlet 504 has two branches. One branch is connected to the spray water inlet 502, and the other branch is connected to a buffer tank 6. The spray water inlet 502 is arranged at the top of the thickening tank body 501. The spray water inlet 502 is connected to a spray water inlet pipeline 508. The spray water inlet pipeline 508 is provided with a spray pump. The spray water inlet pipeline 508 is connected to a plurality of spray heads 509; a number of water spray holes 5091 are arranged on the surface of the spray head 509. A spray channel 5092 is arranged inside the spray head 509. The spray channel 5092 communicates with the water spray holes 5091; the spray channel 5092 is of a conical structure. One end of the spray channel 5092 close to the water spray holes 5091 is provided with an adjusting part 5093. The aperture of the adjusting part 5093 decreases sequentially from the end away from the water spray holes 5091 to the end close to the water spray holes 5091. The adjusting part 5093 is made of elastic rubber material.

[0026] The coal-water inlet pipeline 9 is provided with a plurality of branch pipelines. The plurality of branch pipelines are arranged corresponding to a plurality of coal-water inlets 503. The plurality of coal-water inlets 503 are arranged on the left side of the thickening tank body 501 from top to bottom in sequence; the bottom of the thickening tank 5 body is in a bowl shape;

[0027] The thickening tank body 501 is provided with a stirring mechanism. The stirring mechanism includes a fixing frame 1001 and a motor 1002. The fixing frame 1001 is fixedly arranged on the thickening tank 5 body. The motor 1002 is fixedly connected to the top of the fixing frame 1001. The bottom end of the motor 1002 is connected with a rotating shaft 1003 through a coupling and the rotating shaft 1003 is connected with a stirring paddle 1004; a dirt scraping plate is connected to the bottom of the rotating shaft 1003; the dirt scraping plate includes two symmetrically arranged dirt scraping support plates 1006. The dirt scraping support plates 1006 are fixedly arranged at the bottom of the rotating shaft 1003. A dirt scraping brush 1007 is arranged at one end of the dirt scraping support plate 1006 away from the rotating shaft 1003.

[0028] Working process:

[0029] The coal-water mixture in the coal-water clarifier 1 contains coal cinder, suspended matter and sewage. Part of it enters the coal conveying trestle and the spray pipeline 3 of the coal yard, and the other part enters the second conveying pipeline 4 through the first conveying pipeline 2, and then is temporarily stored and distributed in the distribution tank 8, and enters the thickening tank 5 through multiple branch pipelines of the coal-water inlet pipeline 9. The arrangement of the bell mouth 503 of the coal-water inlet can further evenly distribute the coal-water mixture on the grating plate 11. The suspended matter in the coal-water mixture is filtered through the action of the metal wires on the grating plate 11. Under the agitation of the agitation mechanism, the coal cinder in the coal-water mixture gradually precipitates. Part of the upper clear water enters the buffer tank 6 through a special pipeline as makeup water, and the other part enters the spray water inlet pipeline 508 to realize the cleaning spray of the thickening tank 5. The lower ash slag and other precipitates enter the external dehydration system 7 for subsequent treatment.

[0030] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and all such modifications or substitutions should fall within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. Coal-containing wastewater treatment and reuse system, characterized in that, It includes a coal-water clarifying tank (1). The coal-water clarifying tank (1) is connected to the coal conveying trestle and the coal yard spraying pipeline (3) through a first conveying pipeline (2), and a conveying pump (201) is connected to the first conveying pipeline (2). The first conveying pipeline (2) is connected to a thickener (5) through a second conveying pipeline (4). The thickener (5) is respectively connected to a buffer tank (6) and an external dewatering system (7) through pipelines. The second conveying pipeline (4) is connected to a distribution tank (8). The distribution tank (8) is connected to a coal-water inlet pipeline (9) through a pipeline. The thickener (5) includes a thickener body (501). The thickener body (501) is provided with a spray water inlet (502), a coal-water inlet (503), a water outlet (504) and a slag outlet (505). The coal-water inlet (503) is connected to the coal-water inlet pipeline (9). The slag outlet (505) is connected to the external dewatering system (7) through a slag discharge pipeline (506). The pipeline connected to the water outlet (504) has two branches. One branch is connected to the spray water inlet (502), and the other branch is connected to the buffer tank (6). The spray water inlet (502) is arranged at the top of the thickener body (501). The spray water inlet (502) is connected to a spray water inlet pipeline (508). The spray water inlet pipeline (508) is provided with a spray pump and is connected to a plurality of spray heads (509). The coal-water inlet pipeline (9) is provided with a plurality of branch pipelines, and the plurality of branch pipelines are correspondingly arranged with a plurality of coal-water inlets (503). The plurality of coal-water inlets (503) are arranged successively from top to bottom on the left side of the thickener body (501). The bottom of the thickener (5) pool body is bowl-shaped. The thickener body (501) is provided with a stirring mechanism. The stirring mechanism includes a fixed frame (1001) and a motor (1002). The fixed frame (1001) is fixedly arranged on the thickener (5) body. The motor (1002) is fixedly connected to the top of the fixed frame (1001). The bottom end of the motor (1002) is connected to a rotating shaft (1003) through a coupling, and the rotating shaft (1003) is connected to a stirring paddle (1004). A dirt scraping plate is connected to the bottom of the rotating shaft (1003).

2. The coal-containing wastewater treatment and reuse system according to claim 1, wherein The dirt scraping plate includes two symmetrically arranged dirt scraping support plates (1006). The dirt scraping support plates (1006) are fixedly arranged at the bottom of the rotating shaft (1003). A dirt scraping brush (1007) is arranged at one end of the dirt scraping support plate (1006) away from the rotating shaft (1003).

3. The coal-containing wastewater treatment and reuse system according to claim 1, wherein A slag discharge valve (507) is arranged on the slag discharge pipeline (506).

4. The coal-containing wastewater treatment and reuse system according to claim 1, wherein The surface of the spray head (509) is provided with a plurality of water spraying holes (5091). The inside of the spray head (509) is provided with a spray channel (5092), and the spray channel (5092) communicates with the water spraying holes (5091).

5. The coal-containing wastewater treatment and reuse system according to claim 4, characterized in that, An adjusting part (5093) is arranged at one end of the spray channel (5092) close to the water spraying hole (5091). The aperture of the adjusting part (5093) decreases successively from the end far away from the water spraying hole (5091) to the end close to the water spraying hole (5091).

6. The coal-containing wastewater treatment and reuse system according to claim 1, characterized in that, A flaring opening is provided at one end of the coal-water inlet (503) away from the coal-water inlet pipeline (9), a grille plate (11) is arranged at the orientation position of the flaring opening in the thickener body (501), and metal wires are arranged on the grille plate (11).

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