Nitrogen management | how to deal with nitrogen oxide (NOx) emissions?

Release time:

2022-12-05

NOx is a general term for nitrogen and oxygen compounds, usually including NO and NO2. Atmospheric NOx mainly comes from human activities and natural emissions. The exhaust of NOx in industry is discharged into the atmosphere from the chimney without treatment. NOx is the most difficult in the treatment of waste gas, and it is also the culprit of environmental pollution. If it is not effectively controlled, it will not only affect the health of individuals, but also affect the living and ecological environment of surrounding residents.

Treatment of nitrogen oxide waste gas - end treatment

End-treatment is post-combustion control technology. The main technologies include: selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR), SCR-SNCR mixed technology, activated carbon adsorption, ozone oxidation and denitrification technology, etc. From the perspective of economic and technical feasibility, SCR is still the most effective end-treatment technology of NOX.

1. At present, the main methods to treat nitrogen oxide waste gas are: selective catalytic reduction and selective non-catalytic reduction.

Selective catalytic reduction is the use of NH3 or urea under a certain temperature and catalytic action to reduce harmless N2 and H2O. This method, not only will not affect air pollution, denitration efficiency is relatively high, is the most widely used denitration technology.

2. The difference between selective non-catalytic reduction method and selective catalytic reduction method lies in the control of temperature and the presence or absence of catalyst. Selective non-catalytic reduction is in a certain temperature range, without the action of a catalyst, through the injection of NH3 to selectively reduce NOx to N2 and H2O, and then selective non-catalytic reduction of temperature control is more strict, commonly used urea instead of NH3 reducing agent, can also reduce NOx by more than 50%.

In order to reduce the emissions of nitrogen oxides in industrial enterprises, reduce the pollution of nitrogen oxide waste gas to the atmosphere, combined with the measures of energy conservation and emission reduction advocated by our country, according to our national conditions, a variety of efficient flue gas denitrification methods have been continuously researched and developed, I believe that through continuous development and improvement, choose the best treatment method, These will make a great contribution to our industrial nitrogen oxide treatment.

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