| For a long time,China's coal based energy consumption structure has led to an increasingly prominent problem of atmospheric pollution.The sulfur dioxide,nitrogen oxides and other gases emitted by coal-fired are seriously harmful to the environment.At present,China is in the stage of rapid industrialization,with the growth of energy consumption,emissions of pollutants have increased.According to China's State Council forecast data analysis,by 2020,energy consumption is expected to reach 48.2 tons of standard coal.In such a grim situation,China has put forward "ultra low emission" policy for thermal power plants.The emission reduction technologies for coal-fired power plants will be carried out with ultra-low emission reductions,and incentive measures for sewage charges will be implemented.In order to achieve the concentration of pollutant emissions from thermal power generation units to reach the level of natural gas units.On this basis,in order to solve a series of problems that may arise in the process of transformation,it is of great significance to analyze and evaluate the effect of the implementation of the air pollution control technology in coal-fired power plants.Through consulting relevant literature and data,this paper carefully studies the relevant principles and operation characteristics of desulfurization and denitrification technology in coal-fired power plants,select the most widely used emission reduction technology as the object of study.First of all,based on the cost-effectiveness analysis method,combined with coal-fired power plant desulfurization and denitrification technology characteristics,the calculation model of desulfurization and denitrification efficiency considering the regional emission standards,the unit capacity,coal sulfur content,removal rate,furnace type,control technology and other factors was constructed.And the calculation model of evaluation indexes such as the cost of pollutant removal,the operation cost of unit generation and the cost-effectiveness ratio was constructed.Secondly,the operation of limestone gypsum desulfurization technology and SCR denitration technology are analyzed in depth,and the material consumption costs of each technology are refined.In addition,the cost effectiveness analysis was carried out under different scenarios such as unit capacity,annual operating hours,pollutant emission limits in different areas and ultra-low emission transformation technologies.To study the change law of cost and benefit under different factors and the feasibility of technical transformation.Finally,analysis the impact of air pollutants produced by other industries on air pollution and unit removal costs of pollutants.Besides,compared with the cost-efficiency analysis of thermal power plant,the corresponding recommendations for the formulation of air pollution control policy are put forward.The results show that the unit capacity is inversely proportional to the unit discharge cost,the operating cost and the cost-effectiveness ratio,and is proportional to the annual emission reduction.That is to say,the large capacity unit is conducive to saving costs and reducing emissions obviously.The annual operating time is inversely proportional to the cost of tons of pollutants and the operating costs per unit of electricity generation.It is recommended that the grid company schedule its operating time according to the pollutant discharge of each power plant and reduce the cost while achieving better emission reduction.The concentration of pollutant emissions to achieve emission limits of key areas of the capacity of the unit operation cost value and tons of pollutants removal costs than to the general area emission limits of the high cost,to achieve ultra low emission limits the capacity of the unit operation cost value and tons of pollutants removal costs than to focus on areas to limit emissions of high cost.With the increase of the price of denitration catalyst,the operation cost of unit generation and the removal cost of NOx are increasing gradually,and the cost increase of each capacity unit is basically the same.After the tray tower technology and the HEC coal combustion catalyst were reformed,the pollutant removal rate and annual emission reduction increased greatly,and the cost-effectiveness ratio was less than 1.The environmental and economic benefits were obvious,which proved that the transformation method was feasible. |
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