The gas flow distribution in large tandem integrated electrostatic bag precipitator(EBP) was an important factor which affects the equipment performance.By using numerical simulation method

the internal gas flow distribution in EBP of a 300 MW unit has been calculated.According to the requirements for the internal whole flow field in the precipitator

for gas flow speed at the windward side of the filtering bag

and for flow rate distribution in a filtering bag unit

after comparison of three schemes

a scheme of installing porous gas flow distributing plate in EBP

and installing baffle plate along direction of width at two sides of final-end ash hopper has been finally determined.The results of application test is basically conformed with results of numerical simulation

satisfying the requirements of gas flow field distribution.