CN202315667U - Utilization device of wet flue gas desulfurization wastewater - Google Patents
Utilization device of wet flue gas desulfurization wastewater Download PDFInfo
- Publication number
- CN202315667U CN202315667U CN2011204614061U CN201120461406U CN202315667U CN 202315667 U CN202315667 U CN 202315667U CN 2011204614061 U CN2011204614061 U CN 2011204614061U CN 201120461406 U CN201120461406 U CN 201120461406U CN 202315667 U CN202315667 U CN 202315667U
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- Prior art keywords
- coal
- mercury
- desulfurization wastewater
- flue gas
- storage tank
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Abstract
The utility model relates to a utilization device of wet flue gas desulfurization wastewater. The device comprises a wastewater storage tank, wherein the wastewater storage tank is communicated with a nozzle through a pipeline, a slurry pump and a flowmeter, the nozzle is arranged above a coal conveyor belt in a coal conveying area, the coal conveyor belt is connected with a coal pulverizing system, and the coal pulverizing system is connected with a boiler. The utilization device of wet flue gas desulfurization wastewater does not require complex chemical treatment; and the utility model provides a desulfurization wastewater treatment device which has a simple system, is low in cost and easy in operation and is also a zero-cost device capable of increasing the mercury-removing efficiency, thus difficulties such as high desulfurization wastewater treatment cost are overcome, the high removal efficiency of mercury is realized, the environmental benefit is high and the application prospect is good.
Description
Technical field
The utility model relates to a kind of use device of wet process of FGD waste water; Be particularly related to a kind of desulfurization wastewater and be used for fire coal, belong to environmental protection technical field with the form transformation that promotes mercury in the fire coal, the new device that removes performance that improves mercury with the limestone-gypsum wet desulfurizing process.
Background technology
Mercury pollution causes the extensive concern of domestic scholars in recent years, and the coal-burning power plant is main artificial mercury emissions pollution sources.If do not take control measure, most mercury all can be discharged into atmosphere, can cause a series of health problems." thermal power plant's atmosphere pollutants emission standards " of the up-to-date promulgation of China (GB13223-2011) limits the discharging of mercury.
The form of mercury comprises simple substance mercury shape (Hg in the coal-fired flue-gas
0), oxidation state mercury (Hg
2+) and particle mercury (Hg
P).Hg
2+And Hg
PAll removed by adsorbents such as conventional pollutant control appliance or active carbons easily, and Hg
0But be difficult to remove and discharge into the atmosphere, become global cyclic polluting element.The form of mercury distributes directly related to the removal efficiency of mercury in the flue gas.Discover that the removal efficiency of the content of chlorine element and mercury has positive correlation in the flue gas, therefore improve the content of chlorine in the flue gas, the method that removes performance of a kind of effective raising mercury of can yet be regarded as.And the chlorine in the flue gas is from coal, and chlorinity directly influences the performance that removes of mercury in the coal.Chlorinity is relatively very low in the coal of China, has therefore influenced the demercuration effect.Existing scholar adds chlorine-bearing compound in fire coal both at home and abroad, obtains demercuration effect preferably; Perhaps in flue gas, spray into oxidant, but the velocity pressures of operation etc. are wayward.
The limestone-gypsum wet desulphurization is the desulfur technology that most power plant adopt, and the about 18-22g/L of chlorine ion concentration in the desulfurization wastewater of its generation generally in 20g/L, needs could discharge through reaching discharge standard after the complicated chemical processing.Conventional desulfurization wastewater treatment process exists system complex, problem such as with high costs.
Summary of the invention
The purpose of the utility model is to overcome the deficiency of prior art; A kind of method and apparatus that utilizes of wet process of FGD waste water is provided; Both solved difficult problems such as desulfurization wastewater complex treatment process, cost height, the content that improves chlorine in the coal-fired flue-gas simultaneously is to improve the performance that removes of mercury.
The utility model is realized above-mentioned purpose through following technical scheme:
A kind of use device of wet process of FGD waste water comprises the waste water storage tank, and the waste water storage tank communicates with nozzle through pipeline, slush pump and flowmeter, and nozzle is located at coal conveyer belt top, defeated coal district, and coal conveyer belt links to each other with the coal pulverized coal preparation system, and the coal pulverized coal preparation system connects boiler.
Chlorine in the utility model desulfurization wastewater adds in the coal, gets into flue gas along with burning of coal.The increase of chlorinity helps the difficult Hg that is removed by conventional pollutant control appliance in the coal-fired flue-gas
0To the Hg that is easy to be removed
2+And Hg
PTransform, thereby improve the performance that removes of mercury.Chlorine is discharged in the high-temperature flue gas, and generally the form with HCl exists.Research thinks, HCl directly reacts with mercury element simply, but through intermediate reaction 1), 2), 3) generation intermediate product Cl, Cl
2, behind the HOCl again with Hg reaction (suc as formula 4)-11)), research shows Cl, Cl
2, HCl to the oxidation of mercury relation is: Cl＞Cl
2＞HCl, HOCl also are the important intermediate mediums of mercury oxide simple substance.The existence meeting of HCl plays catalytic action to dioxygen oxidation mercury, and when having small amount of H Cl gas in the SCR system, the oxygenation efficiency of mercury can significantly improve.
1)4HCl+O
2＝Cl
2+H
2O(430-475℃)
2)HCl+O＝OH+Cl
3)Cl
2+OH＝Cl+HOCl
4)Hg
0+Cl+M＝HgCl+M
5)HgCl+Cl+M＝HgCl
2+M
6)Hg0+Cl
2＝HgCl+Cl
7)HgCl+Cl
2＝HgCl
2+Cl
8)Hg
0+HCl＝HgCl+H
9)HgCl+HCl＝HgCl
2+H
10)Hg
0+HOCl＝HgCl+OH
11)HgCl+HOCl＝HgCl
2+OH
The HgCl that forms like this
2In the stable existence form that below 600 ℃ is mercury, soluble in water and more be prone to be adsorbed in form particle mercury (Hg on the particles such as flying dust, active carbon
p), so remove by charcoal absorption and by conventional pollutant equipment more easily, finally improve the performance that removes of mercury.
By this technology, the removal efficiency of mercury can improve 2-50% on conventional efficiency.
The utility model need not through complex chemical treatment; A kind of system is simple, with low cost, the processing desulfurization wastewater device of the easy row of operation and provide; Simultaneously also be the device that a kind of zero cost improves demercuration efficient, both overcome the high difficulty of desulfurization wastewater processing cost, realize the high removal efficiency of mercury again; All have very high environmental benefit, have good application prospects.
Description of drawings
The process chart of the utilization of the wet process of FGD waste water that Fig. 1 relates to for the utility model;
Fig. 2 is the use device structure chart of the utility model wet process of FGD waste water;
Wherein: 1. coal conveyer belt, 2. waste water storage tank, 3. pipeline, 4. valve, 5. slush pump, 6. flowmeter, 7. nozzle, 8. boiler, 9. coal pulverized coal preparation system.
The specific embodiment
Further specify in the face of the utility model down.
A kind of use device of wet process of FGD waste water; Comprise waste water storage tank 2, waste water storage tank 2 communicates with nozzle 7 through pipeline 3, slush pump 5 and flowmeter 6, and nozzle 7 is located at coal conveyer belt 1 top, defeated coal district; Coal conveyer belt 1 links to each other with coal pulverized coal preparation system 9, and coal pulverized coal preparation system 9 connects boiler 8.
Embodiment 1
A kind of wet process of FGD waste water utilize method: a small amount of desulfurization wastewater that wet desulfurization system comes out need not pass through complex chemical treatment and in desulfurization wastewater storage tank 2, store earlier; Waste water storage tank 2 directly links to each other with pipeline 3; There is slush pump 5 that power is provided in the pipeline; There is valve 4 at the water pump two ends, and its flows of flowmeter 6 control evenly are sprayed onto after with the desulfurization wastewater atomizing on the coal that the coal conveyer belt of boiler milling system carries through nozzle 7.According to the general 0.005%-0.15% of chlorinity in the fire coal; The too high meeting of chlorinity causes corrosion on Equipment such as boiler in 0.3% o'clock flue gas and surpass; Chlorinity calculates with average 20g/L in the desulfurization wastewater; Then according to the difference of the chlorinity of each used coal of power plant, coal per ton sprays into wastewater flow rate and also has nothing in common with each other, and the desulfurization wastewater amount in the coal per ton of adding is at 0.075-0.15m
3In/t the scope.Then with sending into boiler furnace burning after the coal powder process, waste water is added in chlorine and the coal in the coal self chlorine and mercury along with burning of coal is discharged in the flue gas, and chlorine promotes Hg in flue gas
0To the Hg that is easy to be removed
2+And Hg
PTransform.
Though the above-mentioned combination specific embodiment is described; But be 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 scheme of the utility model, those skilled in the art need not pay various modifications that creative work can make or distortion still in the protection domain of the utility model.
Claims (1)
1. the use device of a wet process of FGD waste water is characterized in that, comprises the waste water storage tank; The waste water storage tank communicates with nozzle through pipeline, slush pump and flowmeter; Nozzle is located at coal conveyer belt top, defeated coal district, and coal conveyer belt links to each other with the coal pulverized coal preparation system, and the coal pulverized coal preparation system connects boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204614061U CN202315667U (en) | 2011-11-18 | 2011-11-18 | Utilization device of wet flue gas desulfurization wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204614061U CN202315667U (en) | 2011-11-18 | 2011-11-18 | Utilization device of wet flue gas desulfurization wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202315667U true CN202315667U (en) | 2012-07-11 |
Family
ID=46427669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204614061U Expired - Fee Related CN202315667U (en) | 2011-11-18 | 2011-11-18 | Utilization device of wet flue gas desulfurization wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202315667U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500208A (en) * | 2011-11-18 | 2012-06-20 | 山东大学 | Utilization method and device for wet flue gas desulfurization wastewater |
| CN103285720A (en) * | 2013-07-02 | 2013-09-11 | 中国环境科学研究院 | Method and device for removing mercury in flue gas by utilizing organic wastes |
-
2011
- 2011-11-18 CN CN2011204614061U patent/CN202315667U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500208A (en) * | 2011-11-18 | 2012-06-20 | 山东大学 | Utilization method and device for wet flue gas desulfurization wastewater |
| CN103285720A (en) * | 2013-07-02 | 2013-09-11 | 中国环境科学研究院 | Method and device for removing mercury in flue gas by utilizing organic wastes |
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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 |
Granted publication date: 20120711 Termination date: 20201118 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |