Coal gasification rainwater comprehensive treatment system

Abstract

The utility model discloses a kind of coal gasification rainwater comprehensive treatment systems, belong to chemical industry environmental protection technical field, including rainwater collection ditch, rainwater collection pond, ash water treatment device, conveying pipeline and circulation loop, rainwater collection ditch is laid in coal gasification boundary perimeter, rainwater collection pond is communicated with rainwater collection ditch;Ash water treatment device includes the communicating clarifying tank, deaerator, gasification reaction furnace, flash evaporator and degassing unit in turn;Conveying pipeline pumps sewage in rainwater collection pond to the clarifying tank of ash water treatment device, and is mixed with gasification ash water and handles;Circulation loop is treated water and flows through deaerator, gasification reaction furnace, flash evaporator, degassing unit in turn after returning clarifying tank recycling use.The utility model injects pollution rainwater into gasification ash water treatment process, through clarifying tank→de-aerator→gasification furnace→flash evaporation→degassing→clarifying tank purification treatment process, realizes pollutant collaborative removal.

Description

Technical Field

[0001] This utility model belongs to the field of chemical environmental protection technology, and in particular relates to a coal gasification rainwater integrated treatment system, which is especially suitable for coal chemical enterprises in areas with high rainfall. Background Technology

[0002] During coal gasification production, residual coal ash on the ground in the production area mixes with rainwater to form black water. Direct discharge into the rainwater drainage network will lead to excessive levels of wastewater discharge. Traditional methods require sending the polluted rainwater to a wastewater treatment plant, which is costly. Existing technologies have shortcomings, including: failure to achieve source separation and targeted collection of polluted rainwater; lack of a synergistic treatment mechanism with the main coal gasification process; and additional increase in wastewater treatment load and fresh water consumption. Utility Model Content

[0003] Technical problem to be solved: In view of the problems existing in the background technology, this utility model provides a coal gasification rainwater integrated treatment system, which injects polluted rainwater into the gasification ash water treatment process (clarification tank → deaerator → gasifier → flash evaporation → degassing → clarification tank) to achieve synergistic removal of pollutants.

[0004] Technical solution: The coal gasification rainwater integrated treatment system of this utility model includes:

[0005] Rainwater collection ditches are set up around the perimeter of the coal gasification zone to collect rainwater containing coal ash pollution.

[0006] A rainwater collection pond, which is connected to a rainwater collection ditch, is used to temporarily store collected polluted rainwater;

[0007] The ash water treatment device includes a clarification tank, a deaerator, a gasification reactor, a flash evaporator, and a degassing unit connected in sequence.

[0008] The conveying pipeline pumps the sewage in the rainwater collection tank to the clarification tank of the ash water treatment device for mixing and treatment with the gasified ash water.

[0009] The circulating loop, in which the treated water flows sequentially through the deaerator, gasification reactor, flash evaporator, and degassing unit before returning to the clarifier for recycling.

[0010] Preferably, the rainwater collection ditch has a cross-sectional dimension of 400mm wide and 500mm deep, and is arranged around the coal gasification boundary.

[0011] Preferably, the conveying pipeline is a pipeline from the collection tank to the clarifier, and the pipeline from the collection tank to the clarifier is connected to a sewage pump; the volume of the rainwater collection tank is 1200m³.

[0012] Preferably, the pipeline from the collection tank to the clarification tank is also connected to a third control valve for adjusting the mixing ratio of rainwater and gasified ash water.

[0013] Preferably, the clarification tank is equipped with a sedimentation filtration unit for removing solid particles from the mixture of rainwater and gasified ash water.

[0014] Preferably, an ash water tank is also provided between the clarification tank and the deaerator. The inlet end of the ash water tank is connected to the clarification tank, and the outlet end of the ash water tank is connected to an ash water output pipe. The ash water output pipe is connected to an ash water pump. The ash water output pipe is connected to the deaerator through an ash water circulation pipe.

[0015] Preferably, the grey water circulation pipeline is provided with a grey water delivery pipeline in parallel, and the grey water delivery pipeline is connected to the sewage treatment system;

[0016] The grey water delivery pipeline is connected to the first control valve, and the grey water circulation pipeline is connected to the second control valve.

[0017] Preferably, a scrubbing tower is also provided between the deaerator and the gasification reactor.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This utility model adopts a zoned collection system, with dedicated rainwater collection ditches laid around the gasification zone to ensure complete interception of rainwater containing coal ash, preventing the discharge of polluted rainwater and meeting environmental protection regulations; a 1200m³ rainwater collection tank serves as a buffer unit to prevent rainwater overflow; polluted rainwater is injected into the gasification ash water treatment process, undergoing a purification process of clarification tank → deaerator → gasifier → flash evaporation → degassing → clarification tank, achieving synergistic removal of pollutants;

[0020] 2. Rainwater is used to replace part of the fresh water in the gasification ash water system, with a rainwater reuse rate of >90%, reducing the cost of fresh water by more than 30%, realizing the resource utilization of polluted rainwater, and reducing environmental risks; only a small portion of concentrated wastewater is discharged to the treatment plant, reducing the amount of wastewater treated, saving more than 2 million yuan per year, and significantly reducing treatment costs.

[0021] This invention also has other beneficial effects, which are described in the embodiments section of the specification and will not be repeated here. Attached Figure Description

[0022] Figure 1 A schematic diagram of the layout structure of rainwater collection ditches in the gasification boundary area;

[0023] Figure 2 This is a flowchart of a comprehensive rainwater treatment system.

[0024] Attached reference numerals: 1. Gasification zone; 2. Rainwater collection ditch; 3. Collection tank; 4. Sewage pump; 5. Pipeline from collection tank to clarifier; 6. Clarifier; 7. Ash water tank; 8. Ash water pump; 9. Ash water output pipeline; 10. Ash water external delivery pipeline; 11. First control valve; 12. Second control valve; 13. Ash water circulation pipeline; 14. Deaerator; 15. Scrubber; 16. Gasification reactor; 17. Flash evaporator; 18. Circulation loop; 19. Third control valve. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings. Figures 1-2 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0026] Example 1: As Figures 1-2 As shown, the present invention provides a coal gasification rainwater integrated treatment system, which includes a rainwater collection ditch 2, a rainwater collection pool 3, an ash water treatment device, a conveying pipeline, and a circulation loop 18.

[0027] like Figure 1 As shown, rainwater collection ditch 2 is laid around the perimeter of the coal gasification zone 1 to collect rainwater containing coal ash pollution. The cross-sectional dimensions of rainwater collection ditch 2 are 400mm wide and 500mm deep, and it surrounds the coal gasification zone 1. Rainwater collection pond 3 is connected to rainwater collection ditch 2, and has a volume of 1200m³, used to temporarily store the collected polluted rainwater. Rainwater collection ditch 2 ensures complete interception of rainwater containing coal ash, preventing the discharge of polluted rainwater and meeting environmental regulations. The 1200m³ rainwater collection pond 3 serves as a buffer unit to prevent rainwater overflow.

[0028] like Figure 2 As shown, the ash water treatment device includes a clarification tank 6, a deaerator 14, a scrubbing tower 15, a gasification reactor 16, a flash evaporator 17, and a degassing unit connected in sequence. A pipeline pumps wastewater from the rainwater collection tank 3 to the clarification tank 6 of the ash water treatment device, where it is mixed with the gasified ash water. The clarification tank 6 is equipped with a sedimentation filtration unit to remove solid particles from the mixture of rainwater and gasified ash water. The treated water in the circulation loop 18 flows sequentially through the deaerator 14, gasification reactor 16, flash evaporator 17, and degassing unit before returning to the clarification tank 6 for recycling. Polluted rainwater is injected into the gasified ash water treatment process, undergoing a purification process of clarification tank 6 → deaerator 14 → gasification reactor → flash evaporation → degassing → clarification tank 6, achieving synergistic removal of pollutants.

[0029] The pipeline is a collection tank to clarification tank pipeline 5, and the collection tank to clarification tank pipeline 5 is connected to a sewage pump 4. The sewage pump 4 pumps the polluted rainwater to the clarification tank 6 for sedimentation. The collection tank to clarification tank pipeline 5 is also connected to a third control valve 19 to adjust the mixing ratio of rainwater and gasified ash water. The third control valve 19 can be remotely controlled by an electric valve.

[0030] In a preferred embodiment, such as Figure 2 As shown, an ash water tank 7 is also provided between the clarification tank 6 and the deaerator 14. The inlet end of the ash water tank 7 is connected to the clarification tank 6, and the outlet end of the ash water tank 7 is connected to an ash water output pipe 9. The ash water output pipe 9 is connected to an ash water pump 8, which controls the output of the ash water stored in the ash water tank 7. The ash water output pipe 9 is connected to the deaerator 14 through an ash water circulation pipe 13. An ash water external delivery pipe 10 is provided in parallel with the ash water circulation pipe 13, and the ash water external delivery pipe 10 is connected to the sewage treatment system. The ash water external delivery pipe 10 is connected to a first control valve 11, and the ash water circulation pipe 13 is connected to a second control valve 12. Both the first control valve 11 and the second control valve 12 can be remotely controlled by electric valves.

[0031] Example 2: The rainwater treatment method of the integrated rainwater treatment system of this utility model includes the following steps:

[0032] Step 1: Collect rainwater containing coal ash pollution from the coal gasification boundary area 1 through rainwater collection ditch 2 and transport it to rainwater collection pond 3;

[0033] Step 2: The rainwater in the rainwater collection tank 3 is pumped to the clarification tank 6 of the gasification ash water treatment device through the sewage pump and mixed with the gasification ash water;

[0034] Step 3: After sedimentation and filtration, the mixed water is directly sent to the ash water tank 7 for storage and then sent to the deaerator 14 by the ash water pump 8 for deoxygenation, heating and pressurization.

[0035] Step 4: After passing through the scrubbing tower 15, the treated water enters the gasification reactor 16 for use, and then undergoes flash evaporation, cooling, depressurization and removal of non-condensable gases in sequence.

[0036] Step 5: The degassed water is returned to the clarifier 6 for recycling, with a small portion discharged to the wastewater treatment unit.

[0037] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A coal gasification rainwater integrated treatment system, characterized in that, include: Rainwater collection ditch (2), the rainwater collection ditch (2) is laid out at the perimeter of the coal gasification boundary area (1); Rainwater collection tank (3), which is connected to rainwater collection ditch (2); The ash water treatment device includes a clarification tank (6), a deaerator (14), a gasification reactor (16), a flash evaporator (17), and a degassing unit connected in sequence. The conveying pipeline pumps the sewage in the rainwater collection tank (3) to the clarification tank (6) of the ash water treatment device for mixing and treatment with the gasified ash water; The water treated in the circulation loop (18) flows sequentially through the deaerator (14), gasification reactor (16), flash evaporator (17), and degassing unit before returning to the clarifier (6) for recycling.

2. The coal gasification rainwater integrated treatment system according to claim 1, characterized in that, The cross-sectional dimensions of the rainwater collection ditch (2) are 400 mm wide and 500 mm deep, and it is laid around the gasification boundary area (1).

3. The integrated coal gasification rainwater treatment system according to claim 1, characterized in that, The conveying pipeline is a collection tank to clarification tank pipeline (5), and the collection tank to clarification tank pipeline (5) is connected to the sewage pump (4); the volume of the rainwater collection tank (3) is 1200m³.

4. The integrated coal gasification rainwater treatment system according to claim 3, characterized in that, The pipeline (5) from the collection tank to the clarification tank is also connected to a third control valve (19) for adjusting the mixing ratio of rainwater and gasified ash water.

5. The coal gasification rainwater integrated treatment system according to claim 1, characterized in that, The clarification tank (6) is equipped with a sedimentation filtration unit for removing solid particles from the mixture of rainwater and gasified ash water.

6. The integrated coal gasification rainwater treatment system according to claim 1, characterized in that, A ash water tank (7) is also provided between the clarification tank (6) and the deaerator (14). The inlet end of the ash water tank (7) is connected to the clarification tank (6), and the outlet end of the ash water tank (7) is connected to an ash water output pipe (9). The ash water output pipe (9) is connected to an ash water pump (8). The ash water output pipe (9) is connected to the deaerator (14) through an ash water circulation pipe (13).

7. The integrated coal gasification rainwater treatment system according to claim 6, characterized in that, The grey water circulation pipe (13) is connected in parallel with a grey water delivery pipe (10), which is connected to the sewage treatment system; the grey water delivery pipe (10) is connected to the first control valve (11), and the grey water circulation pipe (13) is connected to the second control valve (12).

8. The integrated coal gasification rainwater treatment system according to claim 1, characterized in that, A scrubbing tower (15) is also provided between the deaerator (14) and the gasification reactor (16).

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