CN203971735U - A kind of device with wet flue gas desulfurization waste water oxidation removal Elemental Mercury - Google Patents
A kind of device with wet flue gas desulfurization waste water oxidation removal Elemental Mercury Download PDFInfo
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- CN203971735U CN203971735U CN201420416481.XU CN201420416481U CN203971735U CN 203971735 U CN203971735 U CN 203971735U CN 201420416481 U CN201420416481 U CN 201420416481U CN 203971735 U CN203971735 U CN 203971735U
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- atomizer
- elemental mercury
- flue gas
- denitrification apparatus
- waste water
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Abstract
The utility model relates to a kind of device with wet flue gas desulfurization waste water oxidation removal Elemental Mercury, device comprises boiler, boiler connects SCR denitrification apparatus by economizer, SCR denitrification apparatus connects limestone-gypsum wet desulfuration tower by air preheater, deduster, limestone-gypsum wet desulfuration tower is provided with chimney, in flue between economizer and SCR denitrification apparatus, be furnished with atomizer, atomizer is connected with desulfurization wastewater water tank by slush pump, and atomizer is connected with air compressor provides atomization process required compressed air for it.The utility model has solved the problem that uses low chlorine coal Elemental Mercury emission control difficulty, has solved desulfurization wastewater simultaneously and has processed a difficult problem.
Description
Technical field
The utility model relates to desulfurization wastewater and returns the device that spray realizes Elemental Mercury oxidation removal, belongs to environmental protection technical field.
Background technology
Mercury is the first kinds of pollution matter that atmosphere Poisoning is very strong, can damage the mankind's nervous system.Coal-fired boiler in power plant fume emission is the important sources of mercury in atmosphere.Mercury in coal-fired flue-gas mainly with simple substance state mercury (Hg
0), oxidation state mercury (Hg
2+) and particle mercury (Hg
p) three kinds of forms exist.Wherein particle mercury can remove with burned-coal fly ash in dust arrester, oxidation state mercury is because have stronger water-soluble, can remove by the cleaning function of wet desulphurization, Elemental Mercury has stronger stability and water-fast characteristic, is the difficult point of coal-fired flue-gas mercury control.Raising Elemental Mercury is the key that improves coal-fired flue-gas total mercury removal efficiency to the conversion of oxidation state mercury or particle mercury.
SCR (SCR) denitrification process has facilitation to elemental mercury from coal-fired flue gas to the conversion of oxidation state mercury, but its transformation efficiency is subject to the restriction of chlorinity in flue gas.In flue gas, chlorinity is higher, and Elemental Mercury is higher by the transformation efficiency of the backward oxidation state mercury of SCR denitrification apparatus.Chlorine in flue gas mainly carrys out the chlorine in spontaneous combustion coal, for the boiler that uses high-chlorine coal, by obtaining higher Elemental Mercury transformation efficiency after SCR, and for the boiler that uses low chlorine coal, the transformation efficiency of Elemental Mercury is lower, causes the conventional pollutant control device in coal-burning power plant lower to the removal efficiency of total mercury.Desulfurization wastewater be in limestone-gypsum wet desulfuration running, produce be rich in chlorion (about 20g/L) waste water.Desulfurization wastewater complicated component, toxicity is high, is the difficult point of coal-burning power plant's water treatment.
Patent CN 103521052 A disclose a kind of method that desulfurization wastewater that utilizes coal-burning power plant carries out flue gas demercuration, in the desulfurization wastewater that coal-burning power plant's Limestone/Gypsum-based Wet Process Flue Gas Desulfuration produces, add one or both in halogen additive and demercuration catalyst, after fully mixing, be pumped to the flue between air preheater and deduster, through atomising device atomized spray in flue, fully contact with the dust in the flue gas passing through, mercury in flue gas is removed, and solid and exhaust gas dust in desulfurization wastewater caught removal by deduster, in flue gas demercuration, realize the zero-emission of desulfurization wastewater, process need adds halogen additive and demercuration catalyst, dependence is large, cost is high.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of device with wet flue gas desulfurization waste water oxidation removal Elemental Mercury is provided.
The utility model is achieved through the following technical solutions:
A kind of device with wet flue gas desulfurization waste water oxidation removal Elemental Mercury, comprise boiler, boiler connects SCR denitrification apparatus by economizer, SCR denitrification apparatus connects limestone-gypsum wet desulfuration tower by air preheater, deduster, limestone-gypsum wet desulfuration tower is provided with chimney, in flue between economizer and SCR denitrification apparatus, be furnished with atomizer, atomizer is connected with desulfurization wastewater water tank by slush pump, and atomizer is connected with air compressor provides atomization process required compressed air for it.
When the chlorion in limestone-gypsum wet desulfuration process desulfurization slurry reaches 20000mg/L, by separating measure, obtain desulfurated plaster and be stored in the desulfurization wastewater in desulfurization wastewater water tank.
Before the utility model is injected in the out of stock device of SCR by rich chlorine desulfurization wastewater, without add halogen additive and demercuration catalyst in waste water, utilize the dry chlorine-containing gas producing of waste water and chloride solid to promote the oxidation of SCR catalyst to Elemental Mercury, overcome the dependence of SCR catalyst oxidation Elemental Mercury to chlorine content in coal.
The beneficial effects of the utility model are:
1) improve the removal efficiency of the conventional pollutant control device of coal-burning boiler to Elemental Mercury in flue gas, especially solved the problem that uses low chlorine coal Elemental Mercury emission control difficulty.
2) limestone-gypsum wet desulfuration waste water has obtained recycling, has solved desulfurization wastewater and has processed a difficult problem.
3) treatment of wastes with processes of wastes against one another, has good economy and environmental benefit.
4) waste water dry chlorine-containing gas producing in flue gas can promote the oxidation of SCR catalyst to Elemental Mercury, and produce act on the surface of SCR catalyst with chloride solid, catalyst is played to the effect of modification, without add halogen additive and demercuration catalyst in waste water, just can reach the oxidation efficiency high to Elemental Mercury.
Accompanying drawing explanation
Fig. 1 is structure drawing of device of the present utility model;
Wherein: 1. boiler, 2. economizer, 3.SCR denitrification apparatus, 4. air preheater, 5. deduster, 6. limestone-gypsum wet desulfuration tower, 7. chimney, 8. desulfurated plaster, 9. desulfurization wastewater water tank, 10. slush pump, 11. air compressors, 12. atomizers.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
A kind of device with wet flue gas desulfurization waste water oxidation removal Elemental Mercury, comprise boiler 1, boiler 1 connects SCR denitrification apparatus 3 by economizer 2, SCR denitrification apparatus 3 connects limestone-gypsum wet desulfuration tower 6 by air preheater 4, deduster 5, limestone-gypsum wet desulfuration tower 6 is provided with chimney 7, in flue between economizer 2 and SCR denitrification apparatus 3, be furnished with atomizer 12, atomizer 12 is connected with desulfurization wastewater water tank 9 by slush pump 10, and atomizer 12 is connected with air compressor 11 provides atomization process required compressed air for it.
Method with wet flue gas desulfurization waste water oxidation removal Elemental Mercury: desulfurization wastewater through slush pump be delivered to be arranged in SCR before atomizer 12 in flue, under the compressed-air actuated effect providing at air compressor 11, after atomization, be injected in flue, moisture in desulfurization wastewater evaporates under flue gas, part inorganic salts are with solid matter crystallization, and discharge chlorine-containing gas in flue gas, chlorine-containing gas and chloride solid matter act on SCR catalyst, promote that in flue gas, Elemental Mercury is catalytically conveted to oxidation state mercury.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of utility model is described; but the not restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.
Claims (1)
1. the device with wet flue gas desulfurization waste water oxidation removal Elemental Mercury, comprise boiler, boiler connects SCR denitrification apparatus by economizer, SCR denitrification apparatus connects limestone-gypsum wet desulfuration tower by air preheater, deduster, limestone-gypsum wet desulfuration tower is provided with chimney, it is characterized in that, in flue between economizer and SCR denitrification apparatus, be furnished with atomizer, atomizer is connected with desulfurization wastewater water tank by slush pump, and atomizer is connected with air compressor provides atomization process required compressed air for it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420416481.XU CN203971735U (en) | 2014-07-25 | 2014-07-25 | A kind of device with wet flue gas desulfurization waste water oxidation removal Elemental Mercury |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420416481.XU CN203971735U (en) | 2014-07-25 | 2014-07-25 | A kind of device with wet flue gas desulfurization waste water oxidation removal Elemental Mercury |
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| CN203971735U true CN203971735U (en) | 2014-12-03 |
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| CN201420416481.XU Expired - Fee Related CN203971735U (en) | 2014-07-25 | 2014-07-25 | A kind of device with wet flue gas desulfurization waste water oxidation removal Elemental Mercury |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104084028A (en) * | 2014-07-25 | 2014-10-08 | 山东大学 | Device and method for oxidizing and removing elemental mercury by using wet flue gas desulfurization wastewater |
| CN106039980A (en) * | 2016-08-04 | 2016-10-26 | 山东奥特高科环保科技有限公司 | High temperature flue gas mercury removal device and technology |
| CN106587225A (en) * | 2016-12-07 | 2017-04-26 | 浙江德创环保科技股份有限公司 | Zero discharge process for desulfurization wastewater |
| CN106693695A (en) * | 2016-12-30 | 2017-05-24 | 湖州鼎诚环保科技有限公司 | Energy-saving type flue gas treating system |
-
2014
- 2014-07-25 CN CN201420416481.XU patent/CN203971735U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104084028A (en) * | 2014-07-25 | 2014-10-08 | 山东大学 | Device and method for oxidizing and removing elemental mercury by using wet flue gas desulfurization wastewater |
| CN106039980A (en) * | 2016-08-04 | 2016-10-26 | 山东奥特高科环保科技有限公司 | High temperature flue gas mercury removal device and technology |
| CN106039980B (en) * | 2016-08-04 | 2018-08-17 | 山东奥特高科环保科技有限公司 | A kind of high-temperature flue gas mercury removal device and technique |
| CN106587225A (en) * | 2016-12-07 | 2017-04-26 | 浙江德创环保科技股份有限公司 | Zero discharge process for desulfurization wastewater |
| CN106693695A (en) * | 2016-12-30 | 2017-05-24 | 湖州鼎诚环保科技有限公司 | Energy-saving type flue gas treating system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20200725 |