On Line Monitoring Of Ammonium Bisulfate Blocking In Air Preheater After Denitrification

With the increasing environmental problems,pollution in China on coal-fired power plants increasingly stringent requirements,most of the domestic power plant has been equipped with selective catalytic reduction(SCR)denitration device to control the emission of NOx.However,during the process of catalytic reduction of NOx in the SCR denitrification device,the side effects are also generated with a viscous and corrosive ammonium sulfate(ABS).For the power plant operation denitration system cause air preheater heating surface ABS deposition,then cause the clogging problem,analyzes the formation process and influence factors of ABS,combined with the characteristics of ABS condensation and operation giving the determining method of deposition area,temperature range that corresponds to the ABS deposition area in China’s power plants in the air preheater 150 to 190 DEG C.According to the characteristics of air preheater heating surface,describes the calculation method of discrete numerical temperature field of air preheater,and a 1000 MW power plant auxiliary air preheater calculation of air preheater internal heat transfer components and working fluid temperature field.According to the calculation results of temperature field drawing internal temperature characteristic curve,analysis of rotary air preheater working principle and heat transfer components and working fluid temperature distribution.The temperature characteristic curve according to the calculation results of drawing heat transfer elements,combined with the ABS model to forecast the deposition area under various conditions heat transfer element deposition area,the deposition of ABS area with load reduction to extend the high temperature heating surface.Based on the NH3 and SO3 concentration in the actual operation and the calculation of the temperature field,the Radian number is calculated and combined with the monitoring of the flue gas resistance to analyze the ash blocking situation and the development trend of the air preheater.According to the calculation model of the Matlab calculation program,combined with the input and output parameters and temperature field cloud design GUI user on line monitoring interface.