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《Journal of Safety and Environment》 2010-03
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Review on the applications and advances of coal-fired flue gas decontamination by wet denitration technology

WANG Li~1,WU Zhong-biao~2 (1 College of Biological and Environmental Engineering,Zhejiang Shuren Universily,Hangzhou 310015,China;2 Department of Environmental Engineering,Zhejiang University,Hangzhou 310027, China)  
This paper lakes its interest in making a comprehensive review on the applications and advances of coal-fired flue gas decontamination by wet denitration technology.As a matter of fact, the emission of nitrogen oxides (NO_x), 95% of which is nitric oxide (NO) with 5 % being nitrogen dioxide (NO_x), exists in the atmosphere as the result of industrial gas exhaust or the product of the incinerated plants.And it brings about, in turn, serious environmental problems, such as acid rain and depletion of the ozone layer.Therefore, it has become a very urgent social problem in recent years to reduce the emission amount of nitrogen oxides in order to lower the environmental pollution.Coming from this need, an important method known as wet denitration technology of NO_x has been developed by the present authors in hoping to absorb the large amounts of nitrogen oxides in reality.Actually, the superiority of the wet denitration technology lies in making it easier to be used along with the already existing wet desulfurization process, whose advantage is that it can be operated at normal temperature.To meet the demand of reducing nitrogen oxides emission, various absorption methods have already been worked out such as alkaline absorption with various additives added to the scrubbing system with the purpose of turning insoluble NO into soluble NO_2 or to enact a complex, liquid-phase oxidation, as well as the absorption aided by catalysts.Besides, considerable efforts have been made to improve the wet denitration method by using low solubility nitric oxide.Oxidants such as NaClO_2, KMnO_4 can oxidize NO into NO_2, which is easily absorbed by the solution.Fe EDTA can often be used to bind NO_x highly efficiently, when combined with reducing agent Na_2SO_3.All the above mentioned show that wet denitration technology of NO_x is promising not only from the standpoint of the degree of nitric oxide removal but also from its chemical absorption mechanism. And, in the end, the paper has also put forward some more ideas on how to promote the recycling use of the waste water but also on how to promote the absorption power so as to optimize the said wet denitration technology.
【Fund】: 浙江省教育厅项目(20071036);; 浙江树人大学引进人才资助项目(2008R012)
【CateGory Index】: X701
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