The electrostatic precipitators(EP) in service of coal-firing power plants commonly have problem of failing to reach the standard set for smoke emission.It is believed from analysis that the most fundamental cause leading to said problems is unreasonable design of EP's parameters

especially the small specific dust collection area(SDCA).Regarding to commonly used coal sort for power generation

under condition of reasonably choised SDCA

the concentration of smoke emission at exit of EP can satisfy the requirement of the new emission standard

being lower than 50 mg/m3.The range of DCA is recommended as follows:1.if the concentration of smoke emission to be less than 100 mg/m3

under condition of conventional coal sort

the SDCA should≥110 m2(m3/s);under condition of difficultly collecting coal sort

the SDCA should≥150 m2(m3/s);2.if the concentration of smoke emission to be less than 50 mg/m3

under condition of conventional coal sort

the SDCA must≥125 m2(m3/s);under condition of special coal sorts

the SDCA must≥180 m2(m3/s).