Centred on the estimation of mercury emission from coal-fired boilers in power plants

a model for estimating the mercury emission from typical coal-fired boilers has been established.Based on practically measured data of mercury emission from coal-fired boilers in typical power plants

the mecury emission affecting coefficient Fij in each part of typical coal-fired boiler system has been determined

at the same time

the annual mercury emission from coal-fired boilers in typical power plant being estimated.The total mercury emission from typical coal-fired boilers of of 100 MW unit is about 40~50 kg/year in China.In the event of only electrostatic precipitator(EP) being allocated in tail section of the boiler

the gaseous mercury emission ratio reaches up about 80%;in the case of EP and wet flue gas desulphurization(WFGD) system being simultaneously allocated

the gaseous mercury emission ratio decreased to 30% of the total mercury emission;if EP

WFGD

and selective catalytic reduction(SCR) being used together

the gaseous mercury emission may decrease below 15% of the total mercury emission.