CN114163060A - Process suitable for treating synthetic gas washing water and slag water of IGCC power station - Google Patents
Process suitable for treating synthetic gas washing water and slag water of IGCC power station Download PDFInfo
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- CN114163060A CN114163060A CN202210130138.8A CN202210130138A CN114163060A CN 114163060 A CN114163060 A CN 114163060A CN 202210130138 A CN202210130138 A CN 202210130138A CN 114163060 A CN114163060 A CN 114163060A
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- Prior art keywords
- water
- stripping
- washing water
- gasified
- stripping tower
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- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
Abstract
The invention discloses a process suitable for treating synthesis gas washing water and slag water of an IGCC power station, wherein the two water streams are different in property, and are subjected to independent steam stripping in two steam stripping towers respectively, and due to the fact that the ammonia nitrogen content in the gasification washing water is high, alkali is added before the steam stripping to further improve the PH value to be 9-10, so that the ammonia is released favorably, and then the ammonia is conveyed into the steam stripping towers for steam stripping; adding an acidic substance into the gasified slag water to reduce the pH value to 6-6.5, and conveying the gasified slag water to the inside of another stripping tower for stripping; the ammonia nitrogen of the gasification wastewater treated by the process can be reduced to 100mg/m3Thereby greatly reducing the treatment difficulty and cost of subsequent wastewater.
Description
Technical Field
The invention relates to the technical field of a method for washing synthesis gas and slag water of an IGCC power station, in particular to a process suitable for treating the washing water and the slag water of the synthesis gas of the IGCC power station.
Background
IGCC power generation, the synthesis gas generated by gasification needs to be purified and then sent to a combustion engine for combustion to generate power, wherein, a synthesis gas washing link is provided to mainly remove trace dust and water-soluble impurities in the synthesis gas, such as ammonia, hydrocyanic acid and the like, and the water after washing is generally added firstly because the ammonia content is higherAdjusting the pH value with acid, mixing with gasified slag water from a gasified slag pool, feeding the mixture into a stripping tower for stripping, and feeding the stripped water to the next link for wastewater treatment; the acid is added into the original process water before steam stripping, and only hydrogen sulfide and little ammonia contained in the water can be stripped, so that the ammonia nitrogen content of the treated wastewater is high and is generally 400-800 mg/m3The wastewater is difficult to discharge after reaching the standard and has high cost.
Disclosure of Invention
In view of the above-mentioned deficiencies or inadequacies in the prior art, it would be desirable to provide a process suitable for IGCC power plant syngas scrubber water and slag water treatment.
According to the process for treating the synthesis gas washing water and the slag water in the IGCC power station, the gasification washing water is subjected to independent steam stripping, and due to the fact that the ammonia nitrogen content in the gasification washing water is high, alkali is added before steam stripping to further improve the PH value, and release of ammonia is facilitated; the hardness of the gasified slag water is relatively high, the gasified slag water is added with an acidic substance to reduce the PH value to 6-6.5, and the gasified slag water is conveyed to the inside of another stripping tower for stripping, and the method specifically comprises the following technological processes:
a. adding alkaline substances into the gasified washing water to improve the pH value of the gasified washing water, so that the release of ammonia is facilitated;
b. conveying the gasified washing water added with the alkaline substance to the inside of a first stripping tower, and adding stripping steam;
c. adding an acidic substance into the gasified slag water, and adjusting the pH value of the gasified slag water;
d. conveying the gasification slag water added with the acidic substance to the interior of a second stripping tower, and adding stripping steam;
e. mixing the gas-phase substance stripped from the interior of the first stripping tower with the gas-phase substance stripped from the interior of the second stripping tower, and conveying the mixture to the next working procedure after condensation;
f. and mixing the wastewater in the first stripping tower and the wastewater discharged from the second stripping tower, and conveying the mixture to the next working procedure.
Preferably, the pH value of the gasified washing water added with the alkaline substance is adjusted to 9-10; the alkaline substance is sodium hydroxide solution.
Preferably, the PH value of the gasification slag water added with the acidic substance is adjusted to 6-6.5; the acidic substance is hydrochloric acid with the content of 30%.
Preferably, the pressure of the first stripping tower and the second stripping tower is controlled at 0.2MPa (G), and the temperature of the bottom of the stripping tower is controlled at 130 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the treatment process for the synthesis gas washing water and the slag water of the IGCC power station can reduce the content of ammonia nitrogen in the wastewater discharged by the first stripping tower and the second stripping tower, further reduce the water treatment cost in the wastewater treatment device, reduce the cost investment, enable the wastewater to be discharged up to the standard easily, and greatly reduce the environmental pollution and the resource consumption.
It should be understood that the statements herein reciting aspects are not intended to limit the critical or essential features of any embodiment of the invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a block diagram of the structure of a process for syngas scrubbing water treatment;
FIG. 2 is a block flow diagram of a process for syngas scrubbing water treatment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 2, an embodiment of the present invention provides a process for treating syngas washing water and slag water in an IGCC power station, in which gasification washing water is subjected to separate stripping, and since ammonia nitrogen content in the gasification washing water is high, alkali is added before stripping to further increase PH, which is beneficial to release ammonia; the hardness of the gasified slag water is relatively high, the gasified slag water is added with an acidic substance to reduce the PH value to 6-6.5, and the gasified slag water is conveyed to the inside of another stripping tower for stripping, and the method specifically comprises the following technological processes:
a. adding alkaline substances into the gasified washing water to improve the pH value of the gasified washing water, so that the release of ammonia is facilitated;
b. conveying the gasified washing water added with the alkaline substance to the inside of a first stripping tower for steam stripping;
c. adding an acidic substance into the gasified slag water, and adjusting the pH value of the gasified slag water;
d. conveying the gasification slag water added with the acidic substance to the inside of a second stripping tower for steam stripping;
e. mixing steam extracted from the interior of the first stripping tower with steam extracted from the interior of the second stripping tower, and conveying the mixture to the next working procedure after condensation;
f. and mixing the wastewater in the first stripping tower and the wastewater discharged from the second stripping tower, and conveying the mixture to the next working procedure.
In a preferred embodiment, the pH value of the gasified washing water added with the alkaline substance is adjusted to 9-10; the alkaline substance is preferably sodium hydroxide solution.
In a preferred embodiment, the pH value of the gasification slag water added with the acidic substance is adjusted to 6-6.5; the acidic substance is preferably hydrochloric acid with a content of 30%.
In a preferred embodiment, the pressure of the first stripping tower and the second stripping tower is controlled to be 0.2MPa (G), and the temperature of the bottom of the stripping tower is controlled to be 130 ℃.
In the process, two stripping towers are arranged to perform independent stripping on the gasified washing water, and due to the fact that the ammonia nitrogen content is high, the PH value is further improved by adding alkali before stripping, ammonia release is facilitated, and the ammonia nitrogen of the gasified waste water treated by the process can be reduced to 100mg/m3Thereby greatly reducing the treatment difficulty and cost of subsequent wastewater.
In the description of the present specification, the terms "connect", "mount", "fix", and the like are to be understood in a broad sense, for example, "connect" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present application, the description of the terms "one embodiment," "some embodiments," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (4)
1. A process suitable for the synthesis gas washing water and slag water treatment of an IGCC power station is characterized in that the gasification washing water is subjected to separate steam stripping, and because the ammonia nitrogen content in the gasification washing water is high, alkali is added before the steam stripping to further improve the PH value, thereby being beneficial to the release of ammonia; the hardness of the gasified slag water is relatively high, the gasified slag water is added with an acidic substance to reduce the PH value to 6-6.5, and the gasified slag water is conveyed to the inside of another stripping tower for stripping, and the method specifically comprises the following technological processes:
a. adding alkaline substances into the gasified washing water to improve the pH value of the gasified washing water, so that the release of ammonia is facilitated;
b. conveying the gasified washing water added with the alkaline substance to the inside of a first stripping tower, and adding stripping steam;
c. adding an acidic substance into the gasified slag water, and adjusting the pH value of the gasified slag water;
d. conveying the gasification slag water added with the acidic substance to the interior of a second stripping tower, and adding stripping steam;
e. mixing the gas-phase substance stripped from the interior of the first stripping tower with the gas-phase substance stripped from the interior of the second stripping tower, and conveying the mixture to the next working procedure after condensation;
f. and mixing the wastewater stripped by the first stripping tower and the wastewater stripped by the second stripping tower, and conveying the mixture to the next working procedure.
2. The process applicable to the treatment of the syngas washing water and the slag water of the IGCC power plant as claimed in claim 1, wherein the pH value of the gasification washing water added with the alkaline substance is adjusted to 9-10; the alkaline substance is sodium hydroxide solution.
3. The process applicable to the IGCC power plant synthesis gas washing water and slag water treatment as claimed in claim 2, wherein the pH value of the gasification slag water added with the acidic substance is adjusted to 6-6.5; the acidic substance is hydrochloric acid with the content of 30%.
4. The process of claim 3, wherein the pressure of the first stripping tower and the second stripping tower is controlled to be 0.2MPa (G), and the temperature of the bottom of the stripping tower is controlled to be 130 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210130138.8A CN114163060A (en) | 2022-02-11 | 2022-02-11 | Process suitable for treating synthetic gas washing water and slag water of IGCC power station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210130138.8A CN114163060A (en) | 2022-02-11 | 2022-02-11 | Process suitable for treating synthetic gas washing water and slag water of IGCC power station |
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| CN114163060A true CN114163060A (en) | 2022-03-11 |
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| CN202210130138.8A Pending CN114163060A (en) | 2022-02-11 | 2022-02-11 | Process suitable for treating synthetic gas washing water and slag water of IGCC power station |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130160607A1 (en) * | 2010-07-12 | 2013-06-27 | Hado Heckmann | Method for producing pressed articles containing coal particles |
| CN105948306A (en) * | 2016-05-12 | 2016-09-21 | 华陆工程科技有限责任公司 | Pretreatment and comprehensive utilization method of wastewater and waste gas produced during coal gasification |
| CN106673292A (en) * | 2017-03-15 | 2017-05-17 | 赵昱昊 | Coal gasification greywater pretreatment method |
| CN215048826U (en) * | 2021-04-12 | 2021-12-07 | 崔静思 | Gasification slag water treatment facilities |
| CN113998747A (en) * | 2020-07-27 | 2022-02-01 | 山西潞安煤基清洁能源有限责任公司 | Steam stripping method for high-sulfur coal washing water |
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2022
- 2022-02-11 CN CN202210130138.8A patent/CN114163060A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130160607A1 (en) * | 2010-07-12 | 2013-06-27 | Hado Heckmann | Method for producing pressed articles containing coal particles |
| CN105948306A (en) * | 2016-05-12 | 2016-09-21 | 华陆工程科技有限责任公司 | Pretreatment and comprehensive utilization method of wastewater and waste gas produced during coal gasification |
| CN106673292A (en) * | 2017-03-15 | 2017-05-17 | 赵昱昊 | Coal gasification greywater pretreatment method |
| CN113998747A (en) * | 2020-07-27 | 2022-02-01 | 山西潞安煤基清洁能源有限责任公司 | Steam stripping method for high-sulfur coal washing water |
| CN215048826U (en) * | 2021-04-12 | 2021-12-07 | 崔静思 | Gasification slag water treatment facilities |
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