Reformation Optimization For FGD System Of Huadian Suzhou Power Plant 630MW Thermal Power Unit

In recent years,the nation has raised the emission standards of air pollutants for coal-fired power plants(the emission concentration of flue gas and dust shall not be more than 5 mg/ m~3,and the emission concentration of sulfur dioxide shall not be more than 35 mg/ m~3).The original design standards and process equipment of the power plants can no longer meet the requirements(The original emission standards: for the flue gas was lower than 100 mg/ m~3,and the sulfur dioxide 400 mg/ m~3 respectively),therefore,it is essential to carry out retrofits for the power plants to reduce emissions.In this paper,the desulfurization system of 630 MW units in Huadian Suzhou Power Plant is taken as the research object.By expounding and analyzing the equipment status,operating conditions,index emissions and other aspects of the existing desulfurization system,the reasons for failing to meet the emission standards are investigated and determined.By putting forward three modification plans,the feasibility,stability,construction conditions,construction period and cost of the three plans are compared,and the double-tower double-circulation plan is selected and implemented.Taking the reformed desulfurization system as the object,the performance test of desulfurization system was carried out.Test whether the concentration of sulfur dioxide and soot discharged from the reformed desulfurization system meets the national emission standards.The results show that the retrofit plan of double towers and double circulation in desulfurization system(i.e.,the retrofit plan of comprehensive wet desulfurization process by adding secondary absorption tower,trays and bundle dust-collector,etc)in the Huadian Suzhou Power Plant is effective.Under different unit loads,the emission of flue gas,the concentration of sulfur dioxide,desulfurization efficiency and dust emission concentration can meet the national ultra-low emission standards.