| Yangtze River Delta region(including Jiangsu province,Zhejiang province,Anhui province and Shanghai city)is a very important economic area in China as its high population,highly developed economies,geographical advantages and so on.As one of the main industries in this area,the steel industry plays a very important role in air pollution emissions and stongly affects the air quality of this area.The main air pollutants emitted from steel industry are particulate matter(PM),sulfur dioxide(SO2)and nitrogen oxides(NOx).And granulation process(Sintering and Pelletizing)is the major origin of air pollution emissions in the steel factory.With the increased attention of air pollution control from government and stricter national industry air polltutants emission standards,how to select mature technology,economically feasible and environmentally friendly pollutant control technology has become an urgent problem to be solved in various steel enterprises.First of all,by referring to the Steel Industry Yearbook in China,environmental statistics reports and related literatures to know the scale of production,geographical distribution and pollution emission situation of the steel industry in the Yangtze River Delta region,the steel industry directory in Yangtze River Delta region and other related information has been given.After analyzing the dust removal technologies,desulfurization technologies and denitration technologies adopted by each steel industries,the typical enterprises were selected to be conducted on-the-spot investigation and the related data statistics.According to the survey results,dust removal technology in the Yangtze River Delta region tends to be the same,all enterprises generally choose electrostatic dust removal technology as particulate matter capture technology of sintering machine and pelletizing machine.Desulphurization technology is more diversified.The mainstream technologies include limestone-gypsum method,ammonia method,spray dryer absorber(SDA),circulating fluidized bed(CFB)and MEROS process.Denitration technology has almost no application in Yangtze River Delta region.Only two sets of simultaneous desulfurization and denitration equipment in China currently.Taking into account the current application situations of air pollution control technologies(the monotony of dust removal technologies,the diversity of desulfurization technologies and the lack of denitration technologies),this paper focuses on the evaluation of flue gas desulfurization technologies applied in steel industries.Senondly,this paper has developed an air pollution control technology assessment system with comprehensive consideration of technical factors,economic factors and environmental factors by using the combined analytic hierarchy process(AHP)and fuzzy comprehensive evaluation method.This system are employed to evaluate the diversified desulphurization technologies applied in steel indusctry in the Yangtze River Delta region.The analytic hierarchy process(AHP)is used at first to analyze the weightness of the indexes for establishing the importance of each indicator in the system.Then,based on the data collected,the membership function of each index of large-scale sintering machine(more than 200 m2),small-scale sintering machine(less than or equal to 200 m2)and pellet machine are obtained respectively.After that,the fuzzy comprehensive evaluation is used to sort the existing mainstream desulphurization technologies,describing the advantages and disadvantages of each desulfurization technology and specific application conditions for decision-makers in steel enterprises to choose the most suitable desulfurization technology. |
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