The numerous problems under ultra-low emission should be solved through the optimization of colder-side electrostatic precipitator（ESP）

high-voltage power source selection

and capital assessment. The colder-side ESP operates at temperature near the acid dewpoint

and 20%

4

0% of the emission at ESP outlet can be reduced when the operating temperature decreases from 120

1

50 ℃ to 80

1

10 ℃. High-frequency power source

three-phase power source

and pulse power source are the three main power supplies for ESP. Engineering tests show that the three-phase power source can better cope with high dust load

high-frequency power source can improve the operating performances under good matching conditions

and pulse power source still needs more researches on its application of fine particle and high resistivity dust control. Meanwhile

based on operatio

n optimization and power source selection without sacrificing dust emissions

the electrical power consumption of ESPs should be reduced by integration of system commissioning and controlling optimization on the premise of reaching ultra-low emission.