CN103111182A - Technology for removing mercury through strong oxidization of coal-fired power plant flue gas - Google Patents
Technology for removing mercury through strong oxidization of coal-fired power plant flue gas Download PDFInfo
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- CN103111182A CN103111182A CN2011103636072A CN201110363607A CN103111182A CN 103111182 A CN103111182 A CN 103111182A CN 2011103636072 A CN2011103636072 A CN 2011103636072A CN 201110363607 A CN201110363607 A CN 201110363607A CN 103111182 A CN103111182 A CN 103111182A
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Abstract
The invention discloses a technology for removing mercury through the strong oxidization of a coal-fired power plant flue gas. An apparatus for realizing the technology comprises a flue gas deduster, a heat exchanger, an absorbing tower, a gypsum processing device, a limestone slurry dosing device, a sodium hypochlorite dosing device, a non-acidic chloride dosing device, a demister, a chimney, and a fan. The technology is characterized in that the flue gas from the induced draft fan of a coal-fired boiler is dedusted by the flue gas deduster, is cooled by the heat exchanger, enters the bottom of the absorbing tower, upward flows and meets with an absorbent downward sprayed by the upper portion of the tower in a countercurrent manner, simple-substance mercury in the flue gas is converted to oxidation-state mercury, the oxidation-state mercury is dissolved in water and reacts with soluble sulfides in the slurry at the bottom of the absorbing tower to generate water-insoluble mercuric sulfide which can be removed, and the mercury removed flue gas is demisted by the demister, is heated by the heat exchanger and is discharged to air by the chimney; and the absorbent is obtained through mixing the limestone slurry, sodium hypochlorite and non-acidic chloride according a molar ratio of (10-200):1:1 before entering the absorbing tower.
Description
Affiliated technical field
The present invention relates to the strong oxidation hydrargyrum-removing technology of a kind of coal-fired plant flue gas, belong to the resource and environment technical field.
Background technology
China coal-fired plant flue gas row mercury amount growth rate is very fast, and human health and ecological environment are produced a very large impact.The Chinese government attaches great importance to the control of coal-fired plant flue gas row mercury amount, and the control criterion of having put into effect will be implemented in 2012, and will put into effect more severe standard.
The existing coal-burning power plant of China does not generally all arrange special flue gas demercuration link, how carry out on existing flue gas treating process basis technological transformation realize demercuration up to standard will be the task of top priority.
Total mercury in coal-fired flue-gas has three kinds of forms: Elemental Mercury, oxidation state mercury and solid granulates mercury.The existing technique of thermal power plant can remove the part of flue gas total mercury, and namely deduster can remove most of solid granulates mercury, and wet desulphurization device can remove most of oxidation state mercury, but most Elemental Mercury can not remove, and enters atmosphere with flue gas.Because Elemental Mercury is water insoluble, relatively be difficult to process, so how to remove with economy and effective method the important subject that flue gas elementary mercury becomes countries in the world scientist tackling key problem.
Summary of the invention
The invention provides a kind of new technology that removes flue gas elementary mercury with economy, effective method.
The technical solution used in the present invention is:
The smoke limestone wet desulfurizing process that the existing power plant of China generally adopts is transformed, increased the compound interpolation link of clorox and nonacid villaumite, removed by original smoke limestone wet desulphurization device after Elemental Mercury is converted into oxidation state mercury.
The obvious advantage of above technical scheme is:
1. utilize existing sulfur removal technology to transform, do not affect original technique.
2. only need to add chemicals dosing plant, improvement expenses seldom.
3. operating cost is fewer, good economy performance.
4. can remove 90% above Elemental Mercury.
The present invention is applicable to the power plant that adopts the smoke limestone wet desulfurizing process is carried out flue gas row's mercury amount technological transformation up to standard.
Description of drawings
Accompanying drawing: artwork of the present invention
In figure: (1) smoke duster; (2) heat exchanger; (3) absorption tower; (4) gypsum treatment device; (5) lime stone liquid slurry chemicals dosing plant; (6) sodium hypochlorite medicine adding device; (7) nonacid villaumite chemicals dosing plant; (8) demister; (9) chimney; (10) blower fan.
The specific embodiment
In the accompanying drawings:
former Wet Limestone Desulfurization technique is: coal-burning boiler air-introduced machine flue gas out enters (3) bottom, absorption tower and upwards flows after (1) smoke duster dedusting and the cooling of (2) heat exchanger, mix with the absorbent lime stone slurry adverse current from (5) lime stone liquid slurry chemicals dosing plant that is sprayed downwards by top, absorption tower, sulfur dioxide in flue gas (SO2) generates calcium sulfite with the lime stone slurry reaction, it is gypsum that the airborne dioxygen oxidation that is blasted by (10) blower fan again becomes calcium sulfate (CaSO4), the gypsum slurries that produces is delivered to (4) gypsum treatment device, clean saturated flue gas after desulfurization is removed droplet through (8) demister, (2) enter (9) chimney after the heat exchanger heat temperature raising and enter atmosphere.
The present invention to the transformation of former Wet Limestone Desulfurization technique is: absorbent is mixed before entering (3) absorption tower by the lime stone liquid slurry of (5) lime stone liquid slurry chemicals dosing plant output, the clorox of (6) sodium hypochlorite medicine adding device output and the nonacid villaumite of (7) nonacid villaumite chemicals dosing plant output, and the mol ratio of lime stone liquid slurry, clorox and three kinds of liquids of nonacid villaumite is (10 to 200): 1: 1.
In the absorption tower, Elemental Mercury in flue gas more than 90% is oxidized to oxidation state mercury, dissolvable sulfide reaction in starching with (3) absorption tower bottom liquid after water-soluble generates water-fast mercuric sulphide and removes, flue gas after demercuration enters (9) chimney and enters atmosphere after removing droplet, (2) heat exchanger heat temperature raising through (8) demister.
Claims (2)
1. strong oxidation hydrargyrum-removing technology of coal-fired plant flue gas, comprise smoke duster, heat exchanger, the absorption tower, the gypsum treatment device, lime stone liquid slurry chemicals dosing plant, sodium hypochlorite medicine adding device, nonacid villaumite chemicals dosing plant, demister, chimney, blower fan, it is characterized in that: coal-burning boiler air-introduced machine flue gas out is through the smoke duster dedusting, entering the bottom, absorption tower after the heat exchanger cooling upwards flows, mix with the absorbent adverse current that is sprayed downwards by top, absorption tower, Elemental Mercury in flue gas is oxidized to oxidation state mercury, dissolvable sulfide reaction after water-soluble and in absorption tower bottom liquid slurry generates water-fast mercuric sulphide and removes, flue gas after demercuration is removed droplet through demister, after heat exchanger heats up, enter atmosphere through chimney.
2. the strong oxidation hydrargyrum-removing technology of coal-fired plant flue gas according to claim 1, it is characterized in that: absorbent is mixed before entering the absorption tower by the lime stone liquid slurry of lime stone liquid slurry chemicals dosing plant output, the clorox of sodium hypochlorite medicine adding device output and the nonacid villaumite of nonacid villaumite chemicals dosing plant output, and the mol ratio of lime stone liquid slurry, clorox and three kinds of liquids of nonacid villaumite is (10 to 200): 1: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103636072A CN103111182A (en) | 2011-11-17 | 2011-11-17 | Technology for removing mercury through strong oxidization of coal-fired power plant flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011103636072A CN103111182A (en) | 2011-11-17 | 2011-11-17 | Technology for removing mercury through strong oxidization of coal-fired power plant flue gas |
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| CN103111182A true CN103111182A (en) | 2013-05-22 |
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| CN2011103636072A Pending CN103111182A (en) | 2011-11-17 | 2011-11-17 | Technology for removing mercury through strong oxidization of coal-fired power plant flue gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102886203A (en) * | 2012-11-08 | 2013-01-23 | 福建龙净脱硫脱硝工程有限公司 | Flue gas desulfurization and demercuration method |
| EP3837037A4 (en) * | 2018-08-17 | 2022-04-27 | Steve Feeney Consulting, LLC | Control of aqueous arsenic, selenium, mercury or other metals from flue gas |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306322A (en) * | 2008-02-22 | 2008-11-19 | 北京博奇电力科技有限公司 | Integrative coordinated desulfurization, denitration, demercuration device and technique using spray bubbling method |
| CN101947409A (en) * | 2010-09-29 | 2011-01-19 | 东南大学 | Flue gas mercury removal system based on photochemical advanced oxidation |
| CN201807287U (en) * | 2010-09-29 | 2011-04-27 | 东南大学 | Flue gas demercuration system based on photochemistry advanced oxidation |
-
2011
- 2011-11-17 CN CN2011103636072A patent/CN103111182A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306322A (en) * | 2008-02-22 | 2008-11-19 | 北京博奇电力科技有限公司 | Integrative coordinated desulfurization, denitration, demercuration device and technique using spray bubbling method |
| CN101947409A (en) * | 2010-09-29 | 2011-01-19 | 东南大学 | Flue gas mercury removal system based on photochemical advanced oxidation |
| CN201807287U (en) * | 2010-09-29 | 2011-04-27 | 东南大学 | Flue gas demercuration system based on photochemistry advanced oxidation |
Non-Patent Citations (1)
| Title |
|---|
| 赵毅等: "电厂燃煤过程中汞的迁移转化及", 《环境污染治理技术与设备》, vol. 4, no. 11, 30 November 2003 (2003-11-30), pages 2 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102886203A (en) * | 2012-11-08 | 2013-01-23 | 福建龙净脱硫脱硝工程有限公司 | Flue gas desulfurization and demercuration method |
| CN102886203B (en) * | 2012-11-08 | 2016-05-11 | 福建龙净脱硫脱硝工程有限公司 | A kind of method of flue gas desulfurizing and hydrargyrum-removing |
| EP3837037A4 (en) * | 2018-08-17 | 2022-04-27 | Steve Feeney Consulting, LLC | Control of aqueous arsenic, selenium, mercury or other metals from flue gas |
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Application publication date: 20130522 |