| With the rapid development of urbanization and industrialization,energy consumption has been increasing year by year.In particular,the thermal power industry uses coal as its main raw material,and its air pollutants have become one of the main sources of air pollution in China.In order to meet the "ultra-low emission" requirements of the national and local environmental protection departments in Xinjiang,the thermal power industry is currently actively carrying out technical transformation of coal-fired units.In this study,a major power plant in Xinjiang is taken as an example.Based on the design and demonstration of the original process,its transformation plan is analyzed.The characteristics of emissions of air pollutants such as dust,SO2,and NOx from 2011 to 2018 are compared and analyzed.The emission reduction effect of pollutant thermal power plants before and after the transformation was evaluated;the social and environmental benefits of the transformation project were comprehensively evaluated,and related management and governance measures for the ultra-low emission transformation project were proposed.The research provides scientific theoretical basis and reference cases for the application of related emission reduction technologies in the thermal power industry in the arid regions of Northwest China,and also provides theoretical foundation and application support for the effective role of ultra-low emission renovation projects in the thermal power industry in improving the local air environment quality.The conclusions are as follows:(1)Both NO.1 and NO.2 units use the selective catalytic reduction(SCR)denitration process,new standby layer catalysts are added,and the NO.1 unit is retrofitted with an air preheater.Renovation of ultra-low emission of dust removal For the NO.1 unit,the existing electric dust removal restorative maintenance+high-frequency power supply+reserved phase-change condensator+wet electrostatic dust removal device reconstruction was adopted,and the NO.2 unit is equipped with high-frequency power supply on the basis of the original dust removal device,and at the same time,the electric control technology is modified.The two units of the flue gas desulfurization and ultra-low emission retrofitting both adopt a double tower and double cycle scheme.(2)From 2011 to 2018,the monthly emissions of air pollutants from the two units of the power plant were lower than before the transformation,and the emissions of dust,NOx and SO2 all showed a reduction trend,with reductions of 84.65%,87.63%,and 77.06%respectively.The total emissions of the power plant in the spring,summer,autumn,and winter were reduced by 100.86 tons,83.34 tons,87.42 tons,and 111.84 tons,respectively.The seasonal variation of air pollutants is that the emissions in winter and spring are greater than those in summer and autumn,respectively,and the total emissions in spring and winter account for more than 55.70%of the annual emissions.During the period 2011-2018,the annual average concentrations of dust,NOx and SO2 of the two units decreased by 87.93%,90.10%and 81.22%compared with those before the transformation.(3)After comprehensive evaluation of the reconstruction project,the emission concentration of dust,SO2 and NOx reached the limit requirements,and the landing concentration of pollutants was greatly reduced,which can meet the stricter environmental protection management requirements in the future.The average annual reduction of sewage charge is 614.41×104 yuan,at the same time,it can reduce the risk of high administrative penalty caused by excessive emissions,and achieve certain environmental and economic benefits. |
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