CN113998747A - Steam stripping method for high-sulfur coal washing water - Google Patents
Steam stripping method for high-sulfur coal washing water Download PDFInfo
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- CN113998747A CN113998747A CN202010730619.3A CN202010730619A CN113998747A CN 113998747 A CN113998747 A CN 113998747A CN 202010730619 A CN202010730619 A CN 202010730619A CN 113998747 A CN113998747 A CN 113998747A
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- Prior art keywords
- tank
- water
- discharge
- wastewater
- stripping tower
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 238000005406 washing Methods 0.000 title claims abstract description 48
- 239000003245 coal Substances 0.000 title claims abstract description 26
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 23
- 239000011593 sulfur Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002351 wastewater Substances 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 238000002309 gasification Methods 0.000 claims abstract description 34
- 239000002893 slag Substances 0.000 claims abstract description 32
- 239000002253 acid Substances 0.000 claims abstract description 8
- 238000010992 reflux Methods 0.000 claims abstract description 6
- 230000002378 acidificating effect Effects 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000011001 backwashing Methods 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Landscapes
- 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
The invention discloses a steam stripping method for high-sulfur coal washing water, and belongs to the technical field of steam stripping. Which comprises the following steps: acid discharge water from a washing unit of the gasification device and discharge liquid from a closed purifying system of a single set of gasification device are discharged into a drainage tank of a washing tower and then conveyed to a top feeding section of a wastewater stripping tower; chilling discharge water from a slag removal unit of the gasification device is discharged into a slag water discharge feed tank and then conveyed to an intermediate feeding section of the wastewater stripping tower; low-pressure steam enters from the bottom of the wastewater stripping tower; the liquid coming out from the bottom of the wastewater stripping tower enters a cooler and then is sent to a clarifying tank; and the gas coming out of the top of the wastewater stripping tower and the gas flashed from the top of the discharged slag water feeding tank both enter an air cooler and then are sent into a reflux tank, and the separated acid gas is sent to a torch. The method has the advantages of high treatment efficiency, good treatment effect and low treatment cost.
Description
Technical Field
The invention relates to a steam stripping method of high-sulfur coal washing water, belonging to the technical field of steam stripping.
Background
At present, the content of sulfur in coal in China is generally high, and the sulfur content also tends to increase along with the increase of the mining depth of a coal seam. 7.80% of the coal mines in the domination and key coal mines in China are high-sulfur coal, which is an important coal resource.
After high-temperature gasification of high-sulfur coal, a trace amount of halogen compound gas such as HCl is contained. After the gas is washed, partial CO is dissolved in the discharged washing water2、H2S、NH3And HCN and the like, and the washing water is discharged after being stripped and added with the acid components. At present, the method for treating the wastewater generally adopts a steam stripping method for treatment.
However, the corrosive components of the washing water are complex, not only chloride stress corrosion exists, but also CO is still contained in stripping gas stripped by the stripping tower2、H2S、NH3And corrosive components such as HCN can cause serious condensation corrosion to the stripping tower and the subsequent pipelines and equipment, and can cause large-area shutdown of the whole plant when the corrosion is serious, so that the economic benefit loss is huge.
In view of the above, it is necessary to provide a method for stripping high-sulfur coal washing water to solve the deficiencies of the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a stripping method of high-sulfur coal washing water. The steam stripping method of the high-sulfur coal washing water has the advantages of high treatment efficiency, good treatment effect and low treatment cost, can effectively relieve the corrosion of the steam stripping tower and the pipelines and equipment behind the steam stripping tower, and prolongs the service life of the steam stripping tower and the pipelines and equipment behind the steam stripping tower.
The technical scheme for solving the technical problems is as follows: a stripping method of high-sulfur coal washing water comprises the following steps:
the wastewater subjected to the wastewater stripping treatment comprises acidic discharge water from a washing unit of the gasification device, chilled discharge water from a deslagging unit of the gasification device and discharge liquid from a closed purifying system of a single set of gasification device;
the acidic discharge water from the washing unit of the gasification device and the discharge liquid from the closed emptying system of the single set of gasification device are both discharged into a washing tower drainage tank, and are conveyed to a top feeding section of a wastewater stripping tower through a stripping tower drainage feeding pump;
the chilling discharge water from the slag removal unit of the gasification device is discharged into a slag water discharge feeding tank and is conveyed to the middle feeding section of the wastewater stripping tower through a slag water discharge feeding pump;
low-pressure steam enters from the bottom of the wastewater stripping tower;
the liquid coming out of the bottom of the wastewater stripping tower enters a cooler, is cooled to be less than or equal to 50 ℃, and is sent to a clarifying tank;
and (3) introducing the gas from the top of the wastewater stripping tower and the gas flashed from the top of the slag water discharge feeding tank into an air cooler, cooling to a temperature of less than or equal to 100 ℃, introducing into a reflux tank, and introducing the separated acid gas into a torch.
The steam stripping method of the high-sulfur coal washing water has the beneficial effects that:
1. the steam stripping method of the high-sulfur coal washing water has the advantages of high treatment efficiency, good treatment effect and low treatment cost, can effectively relieve the corrosion of the steam stripping tower and the pipelines and equipment behind the steam stripping tower, and prolongs the service life of the steam stripping tower and the pipelines and equipment behind the steam stripping tower.
2. The steam stripping method of the high-sulfur coal washing water has the advantages of simple operation, low cost and wide market prospect, and is suitable for large-scale popularization and application.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the pH value of the liquid in the drainage tank of the washing tower is 6.0-7.0, and the temperature is 132 +/-2 ℃.
The adoption of the further beneficial effects is as follows: the pH value of the liquid in the water discharge tank of the washing tower is controlled to be 6.0-7.0, thus preventing CaCO after the carbon black water is heated3And (4) depositing. The pH is usually controlled by adding hydrochloric acid at a concentration of 15% by weight.
Further, the pH value of the liquid in the slag water discharging feeding tank is 6.0-7.0, and the temperature is 72 +/-2 ℃.
The adoption of the further beneficial effects is as follows: the pH value of the liquid in the slag water discharging feed tank is controlled to be 6.0-7.0, thus preventing CaCO after carbon black water is heated3And (4) depositing. The pH is usually controlled by adding hydrochloric acid at a concentration of 15% by weight.
Further, the temperature of the wastewater stripping tower is 130-135 ℃, and the pressure is 0.20-0.22 MPa.
The adoption of the further beneficial effects is as follows: the wastewater stripping tower adopts the working parameters, so that a better stripping effect can be ensured.
Further, the pressure of the low-pressure steam is 0.44MPa-0.48 MPa.
The adoption of the further beneficial effects is as follows: the waste water can be stripped by using the low-pressure steam with the pressure.
Detailed Description
The principles and features of this invention are described below in conjunction with specific embodiments, which are set forth merely to illustrate the invention and are not intended to limit the scope of the invention.
Example 1
The stripping method of the high-sulfur coal washing water comprises the following steps:
the wastewater subjected to the wastewater stripping treatment comprises acidic discharge water from a washing unit of the gasification device, quench discharge water from a deslagging unit of the gasification device and discharge liquid from a closed backwashing system of a single set of gasification devices.
And the acidic discharge water from the washing unit of the gasification device and the discharge liquid from the closed clean-up system of the single set of gasification device are both discharged into a washing tower drain tank, the pH value of the liquid in the washing tower drain tank is 6.0, the temperature is 130 ℃, and the liquid is conveyed to the top feeding section of the wastewater stripping tower through a stripping tower drain feeding pump.
And the chilling discharge water from the slag removal unit of the gasification device is discharged into a slag water discharge feed tank, the pH value of the liquid in the slag water discharge feed tank is 6.0, the temperature is 70 ℃, and the liquid is conveyed to the middle feeding section of the wastewater stripping tower through a slag water discharge feed pump. Wherein, the pH values of the liquid in the washing tower drain tank and the slag water discharging feed tank are both 6.0.
Low-pressure steam with the pressure of 0.44MPa enters from the bottom of the wastewater stripper.
And (3) liquid discharged from the bottom of the wastewater stripping tower enters a cooler, is cooled to 50 ℃, and is sent to a clarifying tank.
And (3) introducing the gas from the top of the wastewater stripping tower and the gas flashed from the top of the discharged slag water feeding tank into an air cooler, cooling to 100 ℃, sending into a reflux tank, and sending the separated acid gas to a torch.
Example 2
The stripping method of the high-sulfur coal washing water comprises the following steps:
the wastewater subjected to the wastewater stripping treatment comprises acidic discharge water from a washing unit of the gasification device, quench discharge water from a deslagging unit of the gasification device and discharge liquid from a closed backwashing system of a single set of gasification devices.
And the acidic discharge water from the washing unit of the gasification device and the discharge liquid from the closed clean-up system of the single set of gasification device are both discharged into a washing tower drain tank, the pH value of the liquid in the washing tower drain tank is 6.5, the temperature is 132 ℃, and the liquid is conveyed to the top feeding section of the wastewater stripping tower through a stripping tower drain feeding pump.
And the chilling discharge water from the slag removal unit of the gasification device is discharged into a slag water discharge feed tank, the pH value of the liquid in the slag water discharge feed tank is 6.5, the temperature is 72 ℃, and the liquid is conveyed to the middle feeding section of the wastewater stripping tower through a slag water discharge feed pump. Wherein, the pH values of the liquid in the washing tower drain tank and the slag water discharging feed tank are both 6.5.
Low-pressure steam with the pressure of 0.46MPa enters from the bottom of the wastewater stripping tower.
And (3) liquid discharged from the bottom of the wastewater stripping tower enters a cooler, is cooled to 48 ℃, and is sent to a clarifying tank.
And (3) introducing the gas from the top of the wastewater stripping tower and the gas flashed from the top of the discharged slag water feeding tank into an air cooler, cooling to 98 ℃, sending into a reflux tank, and sending the separated acid gas to a torch.
Example 3
The stripping method of the high-sulfur coal washing water comprises the following steps:
the wastewater subjected to the wastewater stripping treatment comprises acidic discharge water from a washing unit of the gasification device, quench discharge water from a deslagging unit of the gasification device and discharge liquid from a closed backwashing system of a single set of gasification devices.
And the acidic discharge water from the washing unit of the gasification device and the discharge liquid from the closed clean-up system of the single set of gasification device are both discharged into a washing tower drain tank, the pH value of the liquid in the washing tower drain tank is 7.0, the temperature is 134 ℃, and the liquid is conveyed to the top feeding section of the wastewater stripping tower through a stripping tower drain feeding pump.
And the chilling discharge water from the slag removal unit of the gasification device is discharged into a slag water discharge feed tank, the pH value of the liquid in the slag water discharge feed tank is 7.0, the temperature is 74 ℃, and the liquid is conveyed to the middle feeding section of the wastewater stripping tower through a slag water discharge feed pump. Wherein, the pH values of the liquid in the washing tower drain tank and the slag water discharging feed tank are both 7.0.
Low-pressure steam with the pressure of 0.48MPa enters from the bottom of the wastewater stripping tower.
And (3) liquid discharged from the bottom of the wastewater stripping tower enters a cooler, is cooled to 49 ℃, and is sent to a clarifying tank.
And (3) introducing the gas from the top of the wastewater stripping tower and the gas flashed from the top of the discharged slag water feeding tank into an air cooler, cooling to 99 ℃, sending into a reflux tank, and sending the separated acid gas to a torch.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The stripping method of the high-sulfur coal washing water is characterized by comprising the following steps of:
the wastewater subjected to the wastewater stripping treatment comprises acidic discharge water from a washing unit of the gasification device, chilled discharge water from a deslagging unit of the gasification device and discharge liquid from a closed purifying system of a single set of gasification device;
the acidic discharge water from the washing unit of the gasification device and the discharge liquid from the closed emptying system of the single set of gasification device are both discharged into a washing tower drainage tank, and are conveyed to a top feeding section of a wastewater stripping tower through a stripping tower drainage feeding pump;
the chilling discharge water from the slag removal unit of the gasification device is discharged into a slag water discharge feeding tank and is conveyed to the middle feeding section of the wastewater stripping tower through a slag water discharge feeding pump;
low-pressure steam enters from the bottom of the wastewater stripping tower;
the liquid coming out of the bottom of the wastewater stripping tower enters a cooler, is cooled to be less than or equal to 50 ℃, and is sent to a clarifying tank;
and (3) introducing the gas from the top of the wastewater stripping tower and the gas flashed from the top of the slag water discharge feeding tank into an air cooler, cooling to a temperature of less than or equal to 100 ℃, introducing into a reflux tank, and introducing the separated acid gas into a torch.
2. The method for stripping high-sulfur coal washing water according to claim 1, wherein the liquid in the washing tower drain tank has a pH value of 6.0-7.0 and a temperature of 132 ℃ ± 2 ℃.
3. The method for stripping high-sulfur coal washing water according to claim 1, wherein the liquid in the slag water discharging feed tank has a pH value of 6.0-7.0 and a temperature of 72 ℃ ± 2 ℃.
4. The stripping method of high-sulfur coal washing water according to claim 1, characterized in that the temperature of the wastewater stripping tower is 130 ℃ to 135 ℃, and the pressure is 0.20MPa to 0.22 MPa.
5. The method for stripping high-sulfur coal washing water according to any one of claims 1 to 4, wherein the pressure of the low-pressure steam is 0.44MPa to 0.48 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010730619.3A CN113998747A (en) | 2020-07-27 | 2020-07-27 | Steam stripping method for high-sulfur coal washing water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010730619.3A CN113998747A (en) | 2020-07-27 | 2020-07-27 | Steam stripping method for high-sulfur coal washing water |
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| Publication Number | Publication Date |
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| CN113998747A true CN113998747A (en) | 2022-02-01 |
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| CN202010730619.3A Pending CN113998747A (en) | 2020-07-27 | 2020-07-27 | Steam stripping method for high-sulfur coal washing water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114163060A (en) * | 2022-02-11 | 2022-03-11 | 华能（天津）煤气化发电有限公司 | Process suitable for treating synthetic gas washing water and slag water of IGCC power station |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103101988A (en) * | 2013-01-29 | 2013-05-15 | 中国五环工程有限公司 | Method for stripping gas washing water |
| 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 |
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2020
- 2020-07-27 CN CN202010730619.3A patent/CN113998747A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103101988A (en) * | 2013-01-29 | 2013-05-15 | 中国五环工程有限公司 | Method for stripping gas washing water |
| 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 |
Non-Patent Citations (2)
| Title |
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| 宋金荣: "Shell煤气化初步水处理系统运行问题及解决" * |
| 马利: "壳牌煤气化装置17单元系统超压分析与工艺优化实践" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114163060A (en) * | 2022-02-11 | 2022-03-11 | 华能（天津）煤气化发电有限公司 | Process suitable for treating synthetic gas washing water and slag water of IGCC power station |
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Application publication date: 20220201 |