CN215798971U - Zero discharge system is handled to coal gasification buck - Google Patents
Zero discharge system is handled to coal gasification buck Download PDFInfo
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- CN215798971U CN215798971U CN202120530994.3U CN202120530994U CN215798971U CN 215798971 U CN215798971 U CN 215798971U CN 202120530994 U CN202120530994 U CN 202120530994U CN 215798971 U CN215798971 U CN 215798971U
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Abstract
The utility model discloses a zero discharge system for coal gasification ash water treatment, wherein a liquid outlet at the bottom of a medium-pressure flash tank is communicated with an inlet of a vacuum flash tank, and a liquid outlet at the bottom of the vacuum flash tank is communicated with an inlet of a clarifying tank; the outlet of the side surface of the clarifying tank is divided into two paths, wherein one path is communicated with the inlet of the evaporation furnace, the other path is communicated with the inlet of the deaerator, the steam outlet of the evaporation furnace is communicated with the inlet of the evaporation liquid separation tank through the evaporation cooler, the process water outlet of the evaporation liquid separation tank is communicated with the inlet of the deaerator, and the outlet of the deaerator is communicated with an external washing tower through the heat absorption side of the grey water heater; a gas outlet at the top of the medium-pressure flash tank is communicated with an inlet of the medium-pressure flash liquid separation tank through a heat release side of the grey water heater and the medium-pressure flash cooler, and a water outlet of the medium-pressure flash tank is communicated with an inlet of the deaerator; the system can realize zero discharge treatment of slag water and recycle of resources.
Description
Technical Field
The utility model belongs to the technical field of water treatment, and relates to a coal gasification grey water treatment zero-emission system.
Background
In the coal gasification chilling process technology, the synthesis gas generated by the gasification furnace needs to be washed before entering a downstream system. During the scrubbing process, a large amount of process grey water is produced, which contains a large amount of salts and acid gases dissolved in the grey water. To recycle this portion of grey water, the entire amount of grey water slag water is typically sent to a primary water treatment unit for flash evaporation to remove acid gases, followed by precipitation filtration to remove solid particles for reuse. However, after long-time circulation, salt in the grey water system can accumulate, and some calcium and magnesium ions are easy to form precipitates, so that scaling and blockage of equipment can be caused, and therefore, part of high-salt grey water needs to be directly discharged, water resources are wasted, and certain water pollution is caused. In addition, the flash evaporation operation in the primary water treatment unit requires the use of a vacuum pump, and the condensation of the vacuum flash vapor requires a large amount of cooling water to provide sufficient cooling capacity to meet the process requirements. Generally, a gasification device is provided with an air separation system, air separation can generate a large amount of waste nitrogen to be discharged to the atmosphere in the production process, and the temperature of the waste nitrogen is very low relative to gasified flash evaporation gas, so that the waste nitrogen can be used as a cold source to provide cold for gasification flash evaporation, waste gas can be effectively utilized, waste is changed into wealth, and energy gradient utilization is realized.
Therefore, there is a need to develop a zero emission grey water treatment apparatus to address the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a coal gasification grey water treatment zero-emission system, which can realize slag water zero-emission treatment and resource recovery.
In order to achieve the aim, the coal gasification grey water treatment zero-emission system comprises a slag water input pipeline, a medium-pressure flash tank, a vacuum flash tank, a clarifying tank, an evaporation furnace, a deaerator, an evaporative cooler, an evaporative liquid separation tank, a grey water heater, a medium-pressure flash cooler, a medium-pressure flash liquid separation tank, a vacuum flash cooler, a vacuum flash liquid separation tank and a vacuum filter;
the slag water input pipeline is communicated with an inlet of the medium-pressure flash tank, a liquid outlet at the bottom of the medium-pressure flash tank is communicated with an inlet of the vacuum flash tank, and a liquid outlet at the bottom of the vacuum flash tank is communicated with an inlet of the clarifying tank;
the outlet of the side surface of the clarifying tank is divided into two paths, wherein one path is communicated with the inlet of the evaporation furnace, the other path is communicated with the inlet of the deaerator, the steam outlet of the evaporation furnace is communicated with the inlet of the evaporation liquid separation tank through the evaporation cooler, the process water outlet of the evaporation liquid separation tank is communicated with the inlet of the deaerator, and the outlet of the deaerator is communicated with an external washing tower through the heat absorption side of the grey water heater;
a gas outlet at the top of the medium-pressure flash tank is communicated with an inlet of the medium-pressure flash liquid separation tank through a heat release side of the grey water heater and the medium-pressure flash cooler, and a water outlet of the medium-pressure flash tank is communicated with an inlet of the deaerator;
a gas outlet at the top of the vacuum flash tank is communicated with an inlet of the vacuum flash liquid separating tank through a vacuum flash cooler, and a liquid outlet of the vacuum flash liquid separating tank is communicated with an inlet of the clarifying tank;
the outlet at the bottom of the clarifying tank is communicated with the inlet of the clarifying tank through a vacuum filter.
The outlet on the side of the clarifying tank is divided into two paths after passing through the grey water tank and the grey water overflow pump.
The process water outlet of the evaporation liquid separation tank is communicated with the inlet of the deaerator through a process water circulating pump.
The outlet of the deaerator is communicated with an external washing tower through a high-pressure ash water pump and the heat absorption side of the ash water heater
The liquid outlet of the vacuum flash evaporation liquid separation tank is communicated with the inlet of the clarifying tank through a vacuum flash evaporation condensate pump.
The gas outlet of the vacuum flash evaporation liquid separation tank is communicated with the inlet of the vacuum pump.
The outlet at the bottom of the clarifying tank is communicated with the inlet of the clarifying tank through a clarifying tank underflow pump and a vacuum filter.
The liquid outlet at the bottom of the vacuum flash tank is communicated with the inlet of the clarifying tank through a vacuum flash black water pump.
The water supply device also comprises a make-up water pipeline, wherein the make-up water pipeline is communicated with an inlet of the deaerator.
The electric control cabinet is connected with a power interface of the evaporation furnace.
The utility model has the following beneficial effects:
when the coal gasification grey water treatment zero-emission system is specifically operated, the synthetic gas in the slag water is removed by adopting a two-stage flash evaporation mode, the treated slag water is precipitated and then divided into two paths, one path of the treated slag water is deoxidized by a deaerator and heated by a waste water heater and then sent into an external washing tower, the other path of the treated slag water enters an evaporation furnace for evaporation, the salt obtained by evaporation is directly recovered, and the steam generated by evaporation is cooled and subjected to liquid separation treatment and then is recovered as process water, so that the zero-emission treatment of the slag water is realized, and the recovery and the reutilization of the slag water are realized.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a medium-pressure flash tank, 2 is a vacuum flash tank, 3 is a vacuum flash black water pump, 4 is a clarifying tank, 5 is a clarifying tank underflow pump, 6 is an ash water tank, 7 is an ash water overflow pump, 8 is a vacuum flash cooler, 9 is a vacuum flash liquid separating tank, 10 is a vacuum pump, 11 is a vacuum flash condensate pump, 12 is a vacuum filter, 13 is a deaerator, 14 is a high-pressure ash water pump, 15 is an ash water heater, 16 is a medium-pressure flash cooler, 17 is a medium-pressure flash liquid separating tank, 18 is an evaporation furnace, 19 is an evaporation cooler, 20 is an evaporation liquid separating tank, and 21 is a process water circulating pump.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the coal gasification grey water treatment zero-emission system comprises a slag water input pipeline, a medium-pressure flash tank 1, a vacuum flash tank 2, a clarifying tank 4, an evaporation furnace 18, a deaerator 13, an evaporative cooler 19, an evaporation liquid separation tank 20, a grey water heater 15, a medium-pressure flash cooler 16, a medium-pressure flash liquid separation tank 17, a vacuum flash cooler 8, a vacuum flash liquid separation tank 9 and a vacuum filter 12; the slag water input pipeline is communicated with an inlet of the medium-pressure flash tank 1, a liquid outlet at the bottom of the medium-pressure flash tank 1 is communicated with an inlet of the vacuum flash tank 2, and a liquid outlet at the bottom of the vacuum flash tank 2 is communicated with an inlet of the clarifying tank 4; the outlet of the side of the clarifying tank 4 is divided into two paths, wherein one path is communicated with the inlet of an evaporation furnace 18, the other path is communicated with the inlet of a deaerator 13, the steam outlet of the evaporation furnace 18 is communicated with the inlet of an evaporation liquid separation tank 20 through an evaporation cooler 19, the process water outlet of the evaporation liquid separation tank 20 is communicated with the inlet of the deaerator 13, and the outlet of the deaerator 13 is communicated with an external washing tower through the heat absorption side of a grey water heater 15; a gas outlet at the top of the medium-pressure flash tank 1 is communicated with an inlet of a medium-pressure flash liquid separation tank 17 through a heat release side of an ash water heater 15 and a medium-pressure flash cooler 16, and a water outlet of the medium-pressure flash tank 1 is communicated with an inlet of a deaerator 13; a gas outlet at the top of the vacuum flash tank 2 is communicated with an inlet of a vacuum flash liquid separation tank 9 through a vacuum flash cooler 8, and a liquid outlet of the vacuum flash liquid separation tank 9 is communicated with an inlet of a clarification tank 4; the outlet at the bottom of the clarifying tank 4 is communicated with the inlet of the clarifying tank 4 through a vacuum filter 12.
Specifically, an outlet on the side surface of the clarifying tank 4 is divided into two paths after passing through a grey water tank 6 and a grey water overflow pump 7; the process water outlet of the evaporation liquid separation tank 20 is communicated with the inlet of the deaerator 13 through a process water circulating pump 21; the outlet of the deaerator 13 is communicated with an external washing tower through the heat absorption sides of a high-pressure ash water pump 14 and an ash water heater 15; the liquid outlet of the vacuum flash evaporation liquid separation tank 9 is communicated with the inlet of the clarifying tank 4 through a vacuum flash evaporation condensate pump 11; the gas outlet of the vacuum flash separation tank 9 is communicated with the inlet of a vacuum pump 10; the outlet at the bottom of the clarifying tank 4 is communicated with the inlet of the clarifying tank 4 through a clarifying tank underflow pump 5 and a vacuum filter 12; a liquid outlet at the bottom of the vacuum flash tank 2 is communicated with an inlet of a clarifying tank 4 through a vacuum flash black water pump 3.
The present invention further includes a make-up water line, wherein the make-up water line is in communication with an inlet of the deaerator 13, and the make-up water line is used to make up fresh water.
The utility model also comprises an electric control cabinet, wherein the electric control cabinet is connected with a power supply interface of the evaporation furnace 18, the evaporation furnace 18 adopts an electric heating mode for evaporation, and the evaporation furnace is controlled by the electric control cabinet.
The specific work of the utility model is as follows:
the gasified slag water enters a medium-pressure flash tank 1 for flash evaporation, wherein the synthesis gas obtained by flash evaporation enters a medium-pressure flash liquid separation tank 17 for liquid separation treatment after being subjected to heat release and temperature reduction by a grey water heater 15 and being cooled by a medium-pressure flash cooler 16, the synthesis gas output by the medium-pressure flash liquid separation tank 17 enters an external sulfur recovery device, and the liquid output by the medium-pressure flash liquid separation tank 17 enters a deaerator 13;
liquid output from the bottom of the medium-pressure flash tank 1 enters a vacuum flash tank 2 for vacuum flash evaporation, wherein gas output from the vacuum flash tank 2 is cooled by a vacuum flash cooler 8 and then enters a vacuum flash liquid separation tank 9 for liquid separation, gas discharged from the vacuum flash liquid separation tank 9 is discharged by a vacuum pump 10, liquid output from the vacuum flash liquid separation tank 9 enters a clarifying tank 4, liquid output from the bottom of the vacuum flash tank 2 enters the clarifying tank 4 and is clarified in the clarifying tank 4, supernatant liquid output from the clarifying tank 4 is divided into two paths after passing through an ash water tank 6 and an ash water overflow pump 7, one path enters a deaerator 13, and the other path enters an evaporation furnace 18 for evaporation;
steam generated by the evaporation furnace 18 is cooled by an evaporation cooler 19 and then enters an evaporation liquid separation tank 20, wherein gas output by the evaporation liquid separation tank 20 is discharged, liquid discharged by the evaporation liquid separation tank 20 enters a deaerator 13 through a process water circulating pump 21, sediment discharged from the bottom of a clarifying tank 4 enters a vacuum filter 12 through a bottom flow pump 5 of the clarifying tank 4 for filtering, filter cakes obtained by filtering are transported outwards, and liquid obtained by filtering returns to the clarifying tank 4.
After being deoxidized, water in the deaerator 13 enters the grey water heater 15 through the high-pressure grey water pump 14 to exchange heat and raise the temperature, and then enters an external washing tower.
The utility model can realize zero discharge of wastewater of a coal gasification water treatment system, 100 percent of process water can be recycled, meanwhile, the salt in the grey water can also generate economic value through concentration and subsequent treatment, and meanwhile, the waste nitrogen (20 ℃) of air separation waste gas is used for replacing circulating cooling water of all coolers, thereby greatly reducing the scale of a circulating cooling water station and having low energy consumption.
Claims (10)
1. A coal gasification grey water treatment zero-emission system is characterized by comprising a slag water input pipeline, a medium-pressure flash tank (1), a vacuum flash tank (2), a clarifying tank (4), an evaporation furnace (18), a deaerator (13), an evaporative cooler (19), an evaporation liquid separation tank (20), a grey water heater (15), a medium-pressure flash cooler (16), a medium-pressure flash liquid separation tank (17), a vacuum flash cooler (8), a vacuum flash liquid separation tank (9) and a vacuum filter (12);
a slag water input pipeline is communicated with an inlet of the medium-pressure flash tank (1), a liquid outlet at the bottom of the medium-pressure flash tank (1) is communicated with an inlet of the vacuum flash tank (2), and a liquid outlet at the bottom of the vacuum flash tank (2) is communicated with an inlet of the clarifying tank (4);
the outlet of the side surface of the clarifying tank (4) is divided into two paths, wherein one path is communicated with the inlet of the evaporation furnace (18), the other path is communicated with the inlet of the deaerator (13), the steam outlet of the evaporation furnace (18) is communicated with the inlet of the evaporation liquid separation tank (20) through the evaporation cooler (19), the process water outlet of the evaporation liquid separation tank (20) is communicated with the inlet of the deaerator (13), and the outlet of the deaerator (13) is communicated with an external washing tower through the heat absorption side of the grey water heater (15);
a gas outlet at the top of the medium-pressure flash tank (1) is communicated with an inlet of a medium-pressure flash liquid separating tank (17) through a heat release side of a grey water heater (15) and a medium-pressure flash cooler (16), and a water outlet of the medium-pressure flash tank (1) is communicated with an inlet of a deaerator (13);
a gas outlet at the top of the vacuum flash tank (2) is communicated with an inlet of the vacuum flash liquid separating tank (9) through a vacuum flash cooler (8), and a liquid outlet of the vacuum flash liquid separating tank (9) is communicated with an inlet of the clarifying tank (4);
the outlet at the bottom of the clarifying tank (4) is communicated with the inlet of the clarifying tank (4) through a vacuum filter (12).
2. The coal gasification grey water treatment zero-emission system according to claim 1, characterized in that the outlet on the side of the clarifier (4) is divided into two paths after passing through the grey water tank (6) and the grey water overflow pump (7).
3. The coal gasification grey water treatment zero emission system according to claim 1, characterized in that the process water outlet of the evaporation and separation tank (20) is communicated with the inlet of the deaerator (13) through a process water circulating pump (21).
4. The coal gasification grey water treatment zero emission system according to claim 1, characterized in that the outlet of the deaerator (13) is communicated with an external washing tower through a high pressure grey water pump (14) and the heat absorption side of the grey water heater (15).
5. The coal gasification grey water treatment zero emission system according to claim 1, characterized in that the liquid outlet of the vacuum flash separation tank (9) is communicated with the inlet of the clarifier (4) through a vacuum flash condensate pump (11).
6. The coal gasification grey water treatment zero emission system according to claim 1, characterized in that the gas outlet of the vacuum flash separation tank (9) is communicated with the inlet of the vacuum pump (10).
7. The coal gasification grey water treatment zero-emission system according to claim 1, characterized in that the outlet at the bottom of the clarifying tank (4) is communicated with the inlet of the clarifying tank (4) through a clarifying tank underflow pump (5) and a vacuum filter (12).
8. The coal gasification grey water treatment zero emission system according to claim 1, characterized in that a liquid outlet at the bottom of the vacuum flash tank (2) is communicated with an inlet of the clarifier (4) through a vacuum flash black water pump (3).
9. The coal gasification grey water treatment zero emission system of claim 1, further comprising a makeup water conduit, wherein the makeup water conduit is in communication with an inlet of the deaerator (13).
10. The coal gasification grey water treatment zero emission system according to claim 1, further comprising an electronic control cabinet, wherein the electronic control cabinet is connected with a power interface of the evaporation furnace (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120530994.3U CN215798971U (en) | 2021-03-12 | 2021-03-12 | Zero discharge system is handled to coal gasification buck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120530994.3U CN215798971U (en) | 2021-03-12 | 2021-03-12 | Zero discharge system is handled to coal gasification buck |
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| Publication Number | Publication Date |
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| CN215798971U true CN215798971U (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120530994.3U Active CN215798971U (en) | 2021-03-12 | 2021-03-12 | Zero discharge system is handled to coal gasification buck |
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2021
- 2021-03-12 CN CN202120530994.3U patent/CN215798971U/en active Active
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