CN113087262A - Coal gasification wastewater pretreatment system - Google Patents
Coal gasification wastewater pretreatment system Download PDFInfo
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- CN113087262A CN113087262A CN202110336604.3A CN202110336604A CN113087262A CN 113087262 A CN113087262 A CN 113087262A CN 202110336604 A CN202110336604 A CN 202110336604A CN 113087262 A CN113087262 A CN 113087262A
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- 239000003245 coal Substances 0.000 title claims abstract description 22
- 238000002309 gasification Methods 0.000 title claims abstract description 22
- 239000002351 wastewater Substances 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000010866 blackwater Substances 0.000 claims abstract description 22
- 238000005406 washing Methods 0.000 claims abstract description 5
- 239000000706 filtrate Substances 0.000 claims description 23
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/06—Flash evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
本发明公开了一种煤气化废水预处理系统，包括黑水输入管道、中压闪蒸罐、第一换热器、除氧器、真空闪蒸罐、排空管道、第一气水分离器及第二气水分离器；黑水输入管道与中压闪蒸罐的入口相连通，中压闪蒸罐的顶部出口经第一换热器的放热侧、第一气水分离器、除氧器及第一换热器的吸热侧后与外界的洗涤塔相连通；中压闪蒸罐的底部出口与真空闪蒸罐的入口相连通，真空闪蒸罐的顶部出口经第二换热器与第二气水分离器的入口相连通，第二气水分离器的气体出口与排空管道相连通，该系统不需要额外消耗能量就能够实现去除黑水中的粗合成气，同时还可以回收一部分热量。
The invention discloses a coal gasification wastewater pretreatment system, comprising a black water input pipeline, a medium pressure flash tank, a first heat exchanger, a deaerator, a vacuum flash tank, an emptying pipeline and a first gas-water separator and the second gas-water separator; the black water input pipeline is communicated with the inlet of the medium-pressure flash tank, and the top outlet of the medium-pressure flash tank passes through the exothermic side of the first heat exchanger, the first gas-water separator, and the removal of The oxygenator and the heat-absorbing side of the first heat exchanger are communicated with the external washing tower; the bottom outlet of the medium pressure flash tank is communicated with the inlet of the vacuum flash tank, and the top outlet of the vacuum flash tank is exchanged through the second The heater is communicated with the inlet of the second gas-water separator, and the gas outlet of the second gas-water separator is communicated with the exhaust pipe. Part of the heat can be recovered.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and relates to a coal gasification wastewater pretreatment system.
Background
Coal gasification is a leading core technology in the field of IGCC power generation and coal chemical industry, in the coal gasification technology, black water discharged by a gasification furnace needs to be treated by a sewage treatment system, in the prior art, the black water generally carries a large amount of dissolved crude synthesis gas, if the black water directly enters the sewage treatment, danger exists, the safety is poor, if a steam stripping mode is adopted, extra energy consumption can be increased, and the popularization and the application of the coal gasification technology are seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a coal gasification wastewater pretreatment system which can remove the crude synthesis gas in black water without additional energy consumption and can recover a part of heat.
In order to achieve the purpose, the coal gasification wastewater pretreatment system comprises a black water input pipeline, a medium-pressure flash tank, a first heat exchanger, a deaerator, a vacuum flash tank, an emptying pipeline, a first gas-water separator and a second gas-water separator;
the black water input pipeline is communicated with an inlet of the medium-pressure flash tank, and a top outlet of the medium-pressure flash tank is communicated with an external washing tower through a heat release side of the first heat exchanger, the first gas-water separator, the deaerator and a heat absorption side of the first heat exchanger;
the bottom outlet of the medium-pressure flash tank is communicated with the inlet of the vacuum flash tank, the top outlet of the vacuum flash tank is communicated with the inlet of the second gas-water separator through the second heat exchanger, and the gas outlet of the second gas-water separator is communicated with the emptying pipeline.
The device also comprises a third gas-water separator, a clarifying tank and a filtrate tank;
the bottom outlet of the vacuum flash tank is communicated with the inlet of the clarifying tank, the water outlet of the second gas-water separator is communicated with the inlet of the clarifying tank, the top outlet of the clarifying tank is divided into two paths after passing through the overflow tank, one path is communicated with the inlet of the deaerator, the other path is communicated with the inlet of the filtrate tank, the bottom outlet of the clarifying tank is communicated with the inlet of the third gas-water separator through the vacuum belt filter, the water outlet of the third gas-water separator is communicated with the inlet of the filtrate tank, and the bottom outlet of the filtrate tank is communicated with the inlet of the clarifying tank.
A first centrifugal pump is arranged between the deaerator and the heat absorption side of the first heat exchanger.
The bottom outlet of the vacuum flash tank is communicated with the inlet of the clarifying tank through a second centrifugal pump.
The gas outlet of the second gas-water separator is communicated with an emptying pipeline through a first vacuum pump.
The top outlet of the clarifying tank is divided into two paths after passing through the overflow tank and the third centrifugal pump.
The bottom outlet of the clarifying tank is communicated with the inlet of the third gas-water separator through a fourth centrifugal pump, a vacuum belt filter and a second vacuum pump.
The bottom outlet of the filtrate tank is also connected with an external discharge pipeline.
The bottom outlet of the filtrate tank is communicated with the inlet of the clarifying tank through the fifth centrifugal pump.
The water outlet of the second gas-water separator is communicated with the inlet of the clarifying tank through a sixth centrifugal pump.
The invention has the following beneficial effects:
when the coal gasification wastewater pretreatment system is in specific operation, black water output by the black water input pipeline enters the medium-pressure flash tank for flash evaporation, synthetic gas output by the medium-pressure flash tank is subjected to heat release through the first heat exchanger and then enters the first gas-water separator for separation, the separated synthetic gas is combusted and removed, black water output by the bottom of the medium-pressure flash tank enters the vacuum flash tank for vacuum flash evaporation, synthetic gas output by the vacuum flash tank enters the second gas-water separator for separation, and the separated synthetic gas is directly discharged to remove the synthetic gas in the black water.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the 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 first gas-water separator, 4 is a second gas-water separator, 5 is a deaerator, 6 is a clarifying tank, 7 is an overflow tank, 8 is a vacuum belt filter, 9 is a third gas-water separator, 10 is a filtrate tank, 11 is a first heat exchanger, 12 is a second heat exchanger, 13 is a first centrifugal pump, 14 is a second centrifugal pump, 15 is a third centrifugal pump, 16 is a fourth centrifugal pump, 17 is a fifth centrifugal pump, 18 is a first vacuum pump, 19 is a second vacuum pump, and 20 is a sixth centrifugal pump.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
Referring to fig. 1, the coal gasification wastewater pretreatment system of the present invention includes a black water input pipeline, a medium pressure flash tank 1, a first heat exchanger 11, a deaerator 5, a vacuum flash tank 2, a first gas-water separator 3, and a second gas-water separator 4; the black water input pipeline is communicated with an inlet of the medium-pressure flash tank 1, and an outlet at the top of the medium-pressure flash tank 1 is communicated with an external washing tower through a heat release side of the first heat exchanger 11, the first gas-water separator 3, the deaerator 5 and a heat absorption side of the first heat exchanger 11; the bottom outlet of the medium-pressure flash tank 1 is communicated with the inlet of the vacuum flash tank 2, the top outlet of the vacuum flash tank 2 is communicated with the inlet of the second gas-water separator 4 through the second heat exchanger 12, and the gas outlet of the second gas-water separator 4 is communicated with the emptying pipeline.
When in work, the black water output by the black water input pipeline enters the medium-pressure flash tank 1 for flash evaporation, wherein, the synthesis gas output by the medium-pressure flash tank 1 is released heat by the first heat exchanger 11 and then enters the first gas-water separator 3 for separation, wherein the separated synthesis gas is removed by combustion, the black water output from the bottom of the medium-pressure flash tank 1 enters the vacuum flash tank 2 for vacuum flash evaporation, wherein, the black water output by the vacuum flash tank 2 is discharged, the synthetic gas output by the vacuum flash tank 2 enters the second gas-water separator 4 for separation, the separated synthetic gas is directly discharged to remove the synthetic gas in the black water, simultaneously, heat is recovered through the first heat exchanger 11, and the wastewater separated by the first gas-water separator 3 is deoxidized by the deaerator 5 and then enters the first heat exchanger 11 to absorb heat, and then enters the washing tower to recover partial moisture.
Further, a third gas-water separator 9, a clarifying tank 6, an emptying pipeline and a filtrate tank 10 are also included; the bottom outlet of the vacuum flash tank 2 is communicated with the inlet of a clarifying tank 6, the water outlet of the second gas-water separator 4 is communicated with the inlet of the clarifying tank 6, the top outlet of the clarifying tank 6 is divided into two paths after passing through an overflow tank 7, one path of the two paths is communicated with the inlet of a deaerator 5, the other path is communicated with the inlet of a filtrate tank 10, the bottom outlet of the clarifying tank 6 is communicated with the inlet of a third gas-water separator 9 through a vacuum belt filter 8, the water outlet of the third gas-water separator 9 is communicated with the inlet of the filtrate tank 10, and the bottom outlet of the filtrate tank 10 is communicated with the inlet of the clarifying tank 6.
During operation, black water discharged from the vacuum flash tank 2 and wastewater separated from the second gas-water separator 4 converge and then enter the clarifying tank 6 for clarification, wherein supernatant enters the overflow tank 7 and then is divided into two paths, one path enters the deaerator 5, the other path enters the filtrate tank 10, sediment output from the bottom of the clarifying tank 6 enters the vacuum belt filter 8, the obtained filter cake is transported outside, the filtered water enters the filtrate tank 10 after passing through the third gas-water separator 9, in addition, the water output from the filtrate tank 10 is divided into two paths, one path enters the clarifying tank 6, and the other path is discharged.
Further, a first centrifugal pump 13 is provided between the deaerator 5 and the heat absorption side of the first heat exchanger 11.
Further, the bottom outlet of the vacuum flash tank 2 is communicated with the inlet of the clarifier 6 via a second centrifugal pump 14.
Further, the gas outlet of the second gas-water separator 4 is communicated with an evacuation pipeline through a first vacuum pump 18.
Furthermore, the top outlet of the clarifying tank 6 is divided into two paths after passing through the overflow tank 7 and the third centrifugal pump 15.
Further, the bottom outlet of the clarifying tank 6 is communicated with the inlet of the third gas-water separator 9 through a fourth centrifugal pump 16, a vacuum belt filter 8 and a second vacuum pump 19.
Further, an outlet at the bottom of the filtrate tank 10 is also connected with an external discharge pipeline, and part of water in the filtrate tank 10 is discharged through the external discharge pipeline.
Further, a fifth centrifugal pump 17 is included, and the bottom outlet of the filtrate tank 10 is communicated with the inlet of the clarifying tank 6 through the fifth centrifugal pump 17.
Further, the water outlet of the second gas-water separator 4 is communicated with the inlet of the clarifying tank 6 through a sixth centrifugal pump 20.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A coal gasification wastewater pretreatment system is characterized by comprising a black water input pipeline, a medium-pressure flash tank (1), a first heat exchanger (11), a deaerator (5), a vacuum flash tank (2), an emptying pipeline, a first gas-water separator (3) and a second gas-water separator (4);
the black water input pipeline is communicated with an inlet of the medium-pressure flash tank (1), and an outlet at the top of the medium-pressure flash tank (1) is communicated with an external washing tower through a heat release side of the first heat exchanger (11), the first gas-water separator (3), the deaerator (5) and a heat absorption side of the first heat exchanger (11);
the bottom outlet of the medium-pressure flash tank (1) is communicated with the inlet of the vacuum flash tank (2), the top outlet of the vacuum flash tank (2) is communicated with the inlet of the second gas-water separator (4) through the second heat exchanger (12), and the gas outlet of the second gas-water separator (4) is communicated with the emptying pipeline.
2. The coal gasification wastewater pretreatment system according to claim 1, further comprising a third gas-water separator (9), a clarifier (6), and a filtrate tank (10);
the bottom outlet of the vacuum flash tank (2) is communicated with the inlet of the clarifying tank (6), the water outlet of the second gas-water separator (4) is communicated with the inlet of the clarifying tank (6), the top outlet of the clarifying tank (6) is divided into two paths after passing through the overflow groove (7), one path is communicated with the inlet of the deaerator (5), the other path is communicated with the inlet of the filtrate tank (10), the bottom outlet of the clarifying tank (6) is communicated with the inlet of the third gas-water separator (9) through the vacuum belt filter (8), the water outlet of the third gas-water separator (9) is communicated with the inlet of the filtrate tank (10), and the bottom outlet of the filtrate tank (10) is communicated with the inlet of the clarifying tank (6).
3. The coal gasification wastewater pretreatment system according to claim 2, characterized in that a first centrifugal pump (13) is provided between the deaerator (5) and the heat absorption side of the first heat exchanger (11).
4. The coal gasification wastewater pretreatment system according to claim 3, wherein a bottom outlet of the vacuum flash tank (2) is communicated with an inlet of the clarifier tank (6) through a second centrifugal pump (14).
5. The coal gasification wastewater pretreatment system according to claim 4, wherein a gas outlet of the second gas-water separator (4) is communicated with an evacuation pipe through a first vacuum pump (18).
6. The coal gasification wastewater pretreatment system according to claim 5, wherein the top outlet of the clarifier tank (6) is divided into two paths after passing through the overflow tank (7) and the third centrifugal pump (15).
7. The coal gasification wastewater pretreatment system according to claim 6, wherein the bottom outlet of the clarifier (6) is communicated with the inlet of the third gas-water separator (9) through a fourth centrifugal pump (16), a vacuum belt filter (8) and a second vacuum pump (19).
8. The coal gasification wastewater pretreatment system according to claim 2, wherein an external discharge pipe is further connected to the bottom outlet of the filtrate tank (10).
9. The coal gasification wastewater pretreatment system according to claim 7, further comprising a fifth centrifugal pump (17), wherein the bottom outlet of the filtrate tank (10) is communicated with the inlet of the clarifier tank (6) through the fifth centrifugal pump (17).
10. The coal gasification wastewater pretreatment system according to claim 8, wherein a water outlet of the second gas-water separator (4) is communicated with an inlet of the clarifier tank (6) through a sixth centrifugal pump (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110336604.3A CN113087262A (en) | 2021-03-29 | 2021-03-29 | Coal gasification wastewater pretreatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110336604.3A CN113087262A (en) | 2021-03-29 | 2021-03-29 | Coal gasification wastewater pretreatment system |
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| Publication Number | Publication Date |
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| CN113087262A true CN113087262A (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110336604.3A Pending CN113087262A (en) | 2021-03-29 | 2021-03-29 | Coal gasification wastewater pretreatment system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004080573A1 (en) * | 2003-03-10 | 2004-09-23 | Board Of Regents - The University Of Texas System | Regeneration of an aqueous solution from an acid gas absorption process by multistage flashing and stripping |
| US20090050572A1 (en) * | 2007-08-02 | 2009-02-26 | Mcguire Dennis | Enhanced water treatment for reclamation of waste fluids and increased efficiency treatment of potable waters |
| CN204689811U (en) * | 2015-05-28 | 2015-10-07 | 成都高科达科技有限公司 | A kind of preliminary water treatment system for gasification |
| CN109179843A (en) * | 2018-11-14 | 2019-01-11 | 中国华能集团清洁能源技术研究院有限公司 | A kind of water-saving dry coal powder pressure gasifying usage on black water device |
-
2021
- 2021-03-29 CN CN202110336604.3A patent/CN113087262A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004080573A1 (en) * | 2003-03-10 | 2004-09-23 | Board Of Regents - The University Of Texas System | Regeneration of an aqueous solution from an acid gas absorption process by multistage flashing and stripping |
| US20090050572A1 (en) * | 2007-08-02 | 2009-02-26 | Mcguire Dennis | Enhanced water treatment for reclamation of waste fluids and increased efficiency treatment of potable waters |
| CN204689811U (en) * | 2015-05-28 | 2015-10-07 | 成都高科达科技有限公司 | A kind of preliminary water treatment system for gasification |
| CN109179843A (en) * | 2018-11-14 | 2019-01-11 | 中国华能集团清洁能源技术研究院有限公司 | A kind of water-saving dry coal powder pressure gasifying usage on black water device |
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Application publication date: 20210709 |
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