CN101480575A - Method for improving denitration efficiency of limestone/gypsum flue gas desulfurization technique - Google Patents
Method for improving denitration efficiency of limestone/gypsum flue gas desulfurization technique Download PDFInfo
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- CN101480575A CN101480575A CNA2009100291222A CN200910029122A CN101480575A CN 101480575 A CN101480575 A CN 101480575A CN A2009100291222 A CNA2009100291222 A CN A2009100291222A CN 200910029122 A CN200910029122 A CN 200910029122A CN 101480575 A CN101480575 A CN 101480575A
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Abstract
The invention discloses a method for improving the denitration efficiency of a limestone/plaster flue gas desulfurization process. The processing steps are as follows: after flue gas of a power plant is burnt by low nitrogen, taking hydrogen peroxide as a strong oxidizing agent, spraying 30-35 percent of hydrogen peroxide to flue gas according to the mixture ratio of H2O2/NO of 1.37 (mol ratio), and oxidizing NO in the flue gas into NO2; and then simultaneously carrying out desulfurization and denitration by limestone according to the prior limestone/plaster flue gas desulfurization process. The method can oxidize NO in the flue gas into NO2, improve the degree of oxidization of NOX to 60 percent around, utilize the limestone to simultaneously carry out desulfurization and denitration, cannot affect the denitration efficiency of the prior desulfurization system, and achieve 30 percent of denitration efficiency. The method is combined with the prior low-nitrogen burning device of an original power plant for use, so that the emission concentration of the NOX reaches the requirement of Atmospheric Pollutant Emission Standard of Heat Engine Plants on limit value of the highest emission concentration of nitrogen oxides. The invention has the characteristics of smaller changes on the prior system, simple process, small occupied area, relatively less investment, and the like.
Description
Technical field
The present invention relates to flue gas desulphurization, denitrating technique, is a kind of method that improves denitration efficiency of limestone/gypsum flue gas desulfurization technique specifically.
Background technology
According to incompletely statistics, at present China built or newly-built heat-engine plant desulfurized engineering in the shared ratio of limestone/gypsum flue gas desulfurization technique reach more than 85%, it not only can reach the desulfuration efficiency more than 95%, and also has certain denitration ability, the denitration rate is approximately 5%, and the basic principle of denitration is as follows:
2NO
2+H
2O→HNO
3+HNO
2
2HNO
3+CaCO
3→Ca(NO
3)
2+H
2O+CO
2↑
2HNO
2+CaCO
3→Ca(NO
2)
2+H
2O+CO
2↑
That lime stone removes as can be seen from following formula only is water-soluble NO
2, and NO in the coal-fired flue-gas
2Only account for NO
X5～10% of total amount, therefore in limestone/gypsum flue gas desulfurization technique, the denitration rate has only about 5%.
At present, thermal power plant mainly adopts the low nitrogen burning technology to control NO
XDischarging, its concentration of emission is at 600～800mg/m
3About, the denitration rate of limestone/gypsum flue gas desulfurization technique can only be about 5%, do not meet among the GB13223-2003 " thermal power plant's atmosphere pollutants emission standards " requirement to the limit value of nitrogen oxide maximal emission.For satisfying emission request, thermal power plant generally can build flue gas denitrification system separately, but this needs bigger investment.Therefore for thermal power plant, this is a white elephant.
Raising day by day along with the power plant emission standard, most of old power plant is faced with the blowdown presssure of nitrogen oxide, therefore the exploitation low nitrogen combustion apparatus original with it wet method denitration technology of uniting use has boundless prospects for commercial application, but the technology that does not occur large-scale promotion and development ﹠ construction so far, tracing it to its cause is NO
XOxidizability is low, and NO is insoluble in water, thereby gives NO
XRemove and increased difficulty.China power plant mainly adopts the low nitrogen burning technology to control NO at present
XDischarging, its concentration of emission is at 600～800mg/m
3About, if can remove 30% NO again
XThen can reach 400～550mg/m
3Concentration of emission, can meet among the GB13223-2003 " thermal power plant's atmosphere pollutants emission standards " requirement to the nitrogen oxide maximal emission.
Summary of the invention
Goal of the invention of the present invention is to overcome the technological deficiency that prior art exists, and a kind of method that improves denitration efficiency of limestone/gypsum flue gas desulfurization technique is provided, by improving NO in the flue gas
XOxidizability realize improving the purpose of denitration rate.
Because the solubility of NO is very low, causes the denitration efficiency of lime stone lower, therefore, as long as improve NO in the flue gas
XOxidizability will improve the denitration rate significantly.
A kind of method that improves denitration efficiency of limestone/gypsum flue gas desulfurization technique of the present invention, its processing step is:
Power-plant flue gas adopts hydrogen peroxide as strong oxidizer, with H behind low nitrogen burning
2O
2/ NO=1.37 (mol ratio) proportional quantity makes the NO in the flue gas be oxidized to NO to the hydrogen peroxide of flue gas sprinkling 30～35% mass percent concentrations
2:
NO+H
2O
2→NO
2+H
2O
Utilize lime stone to flue gas and desulfurizing and denitrifying according to existing limestone/gypsum flue gas desulfurization technique again.
The inventive method, the NO in the flue gas is oxidized to NO
2, NO
XOxidizability can bring up to about 60%, utilize lime stone desulphurization denitration simultaneously again, not only do not influence the desulfuration efficiency of original system, can also reach 30% denitration rate.The inventive method is united use with the original low nitrogen combustion apparatus of old power plant, can make NO
XConcentration of emission reach " thermal power plant's atmosphere pollutants emission standards " (GB13223-2003) in to the requirement of the limit value of nitrogen oxide maximal emission, have characteristics such as less to original system change amount, that technology is simple, floor space is little, counter investment is few.
Description of drawings
Fig. 1 is the inventive method industrial technology FB(flow block).
The specific embodiment
The 1 further embodiment of narration the inventive method in conjunction with the accompanying drawings:
The flue gas of power plant is behind the process low nitrogen combustion apparatus, and gas approach place, the absorption tower in the limestone/gypsum wet desulfurization system (spray column) sprays into the hydrogen peroxide (H of 30～35% mass percent concentrations
2O
2), hydrogen peroxide sprinkling amount is controlled H again
2O
2/ NO=1.37 (mol ratio), hydrogen peroxide are oxidized to NO as strong oxidizer with the NO in the flue gas
2, make NO
XOxidizability bring up to about 60%.Flue gas enters the absorption tower, according to existing limestone/gypsum flue gas desulfurization technique, utilizes lime stone simultaneously to flue gas desulfurization and denitrification, does not only influence original desulphurization system, also can reach 30% denitration rate, makes it reach 400～550mg/m
3Concentration of emission, meet among the GB13223-2003 " thermal power plant's atmosphere pollutants emission standards " requirement to the limit value of nitrogen oxide maximal emission.
Claims (1)
1 one kinds of methods that improve denitration efficiency of limestone/gypsum flue gas desulfurization technique, its processing step is:
Power-plant flue gas adopts hydrogen peroxide as strong oxidizer, with H behind low nitrogen burning
2O
2/ NO=1.37 (mol ratio) proportional quantity makes the NO in the flue gas be oxidized to NO to the hydrogen peroxide of flue gas sprinkling 30～35% mass percent concentrations
2:
NO+H
2O
2→NO
2+H
2O；
Utilize lime stone to flue gas and desulfurizing and denitrifying according to limestone/gypsum flue gas desulfurization technique again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100291222A CN101480575A (en) | 2009-01-13 | 2009-01-13 | Method for improving denitration efficiency of limestone/gypsum flue gas desulfurization technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100291222A CN101480575A (en) | 2009-01-13 | 2009-01-13 | Method for improving denitration efficiency of limestone/gypsum flue gas desulfurization technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101480575A true CN101480575A (en) | 2009-07-15 |
Family
ID=40877955
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|---|---|---|---|
| CNA2009100291222A Pending CN101480575A (en) | 2009-01-13 | 2009-01-13 | Method for improving denitration efficiency of limestone/gypsum flue gas desulfurization technique |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102327735A (en) * | 2011-08-09 | 2012-01-25 | 中悦浦利莱环保科技有限公司 | Hydrogen peroxide-based flue-gas desulfurizing and denitrifying system and method |
| CN108508135A (en) * | 2017-02-27 | 2018-09-07 | 北新集团建材股份有限公司 | The quantitative analysis method of ammonium ion in a kind of denitrating flue gas desulfurated plaster |
| CN109647144A (en) * | 2018-12-25 | 2019-04-19 | 湖北蔚天环保科技有限公司 | Liquid phase catalyst, preparation and application |
-
2009
- 2009-01-13 CN CNA2009100291222A patent/CN101480575A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102327735A (en) * | 2011-08-09 | 2012-01-25 | 中悦浦利莱环保科技有限公司 | Hydrogen peroxide-based flue-gas desulfurizing and denitrifying system and method |
| CN108508135A (en) * | 2017-02-27 | 2018-09-07 | 北新集团建材股份有限公司 | The quantitative analysis method of ammonium ion in a kind of denitrating flue gas desulfurated plaster |
| CN109647144A (en) * | 2018-12-25 | 2019-04-19 | 湖北蔚天环保科技有限公司 | Liquid phase catalyst, preparation and application |
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Open date: 20090715 |