| The implementation of the"Three-Year Action Plan to Win the Blue Sky Defence Battle"marks that China’s air pollution source emission control has entered a new stage,which requires polluting enterprises to further increase air pollutant reduction on the basis of existing emission control technology.In order to achieve continuous improvement of regional ambient air quality,based on the pollutant emission standards,this paper carried out the analysis of the emission reduction potential of air pollutants of typical pollution sources in Wuhan urban areas,as well as the analysis of the cost-effectiveness of the engineering technology for reducing emissions.While AHP and gray correlation clustering methods are used to construct the comprehensive evaluation system for desulfurization,denitration and dust removal engineering technology selection.The research conclusions are as follows:1.Based on the investigation of the current status of air pollutant emissions from existing enterprises in Wuhan,the characteristics of air pollutant emissions from various industries were obtained.From the total point of view,the emissions of SO2and NOx in the ferrous metal smelting and rolling processing industry are the largest,at 9663.7t/a and19459.53t/a.The PM emissions in the non-metallic mineral products industry are the largest,at 23409.57t/a.From the point of view of the concentration of pollutants,the highest concentrations of SO2,NOx and PM are thermal power industry（SO2:1949mg/m3）,glass industry（NOx:967mg/m3）and cement industry（PM:30g/m3）.2.Through the technical survey of existing pollutant emission reduction projects of key pollution sources in Wuhan,it was found that the most complete of improvement of the emission reduction projects was dust removal（100%）,and the second was desulfurization（83%）and the last was denitration（58%）.From the industry perspective,the most complete was thermal power industry（100%）.By analyzing the emission reduction potential of each major pollution source,the thermal power industry has no greater emission reduction potential.While other industry’s atmospheric pollutants have greater emission reduction potential,especially PM.3.Through cost-effectiveness analysis methods,cost databases and benefit databases of six kinds of desulfurization,three kinds of denitration and four kinds of dust removal methods were constructed.A cost-effective evaluation model of desulfurization,denitrification and dust removal engineering technology was constructed.Three factors affecting the total investment cost were analyzed,in which the inlet concentration and removal rate were directly proportional to the total investment cost.And the flue gas volume was inversely proportional to the total investment cost.Among the four factors that affected the change in operating costs,the inlet concentration and removal,the rate is directly proportional to the operating cost,and the amount of flue gas and the annual operating time are inversely proportional to the operating cost.From the perspective of cost-effectiveness,the higher the pollutant inlet concentration of the desulfurization,denitrification and dedusting project,the higher the benefit.The cost-effectiveness ratio of the SCR and SNCR methods are higher than one.4.Using the analytic hierarchy process to calculate the proportion of each economic,environmental and technical indicators,it focuses on the total investment cost（about0.25）,operating cost（about 0.2）,emission reduction benefit（about 0.2）and removal rate（about 0.25）,which combined with the gray correlation clustering method.The comprehensive evaluation coefficients of technologies in various industries are calculated.And the best air pollutant emission reduction engineering technology is selected for various industries. |
PDF Full Text Request