摘要
为促进湿法脱硝的工业化应用,从湿法脱硝的原理出发,综述了湿法脱硝技术在燃煤烟气净化中的研究进展,分析了各种湿法脱硝方法的优缺点和应用现状。提出了湿法脱硝与湿法脱硫工艺相结合的技术发展方向,从而为降低湿法脱硝技术的成本,实现废水的资源化管理提供了参考。
This paper takes its interest in making a comprehensive review on the applications and advances of coal-fired flue gas decontam-ination by wet denitration technology. As a matter of fact, the emission of nitrogen oxides （NOx ）, 95 % of which is nitric oxide （NO） with 5 % being nitrogen dioxide （NO2）, 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 environ- mental pollution. Coming from this need, an important method known as wet denitration technology of NOx 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 NO2 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 NaCIO2, KMnO4 can oxidize NO into NO2, which is easily absorbed by the solution. FeUEDTA can often be used to bind NOx highly efficiently, when combined with reducing agent Na2SO3. All the above mentioned show that wet denitration technology of NOx 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.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2010年第3期73-77,共5页
Journal of Safety and Environment
基金
浙江省教育厅项目(20071036)
浙江树人大学引进人才资助项目(2008R012)
关键词
环境工程学
烟气净化
湿法脱硝
吸收
environmental engineering
flue gas decontamination
wet denitration
absorption
