Taking the flue gas system in a 1 000 MW unit boiler as the research object

numerical simulation on flow behavior and resistance properties of the electrostatic precipitator inlet and outlet duct were carried out by using the computational fluid dynamics(CFD)software.The reasons for high pipe resistance and inlet flow misdistribution were investigated

and the structure optimization design scheme for the flue duct was put forward.Moreover

the flue flow and resistance characteristics of the flue duct before and after structure optimization was well calculated.It shows that the calculated results were in good agreement with the actual situation

indicating the numerical simulation was available for guiding structure optimization of smoke wind pipes.After optimization

the deflection of the air flow direction and the dust vortex was obviously decreased

the gas flow uniformity in each branch was improved

and the pipeline resistance was reduced.This pipeline optimization offers some references to the smoke duct structure design and energy saving of large power plants.