Organization And Optimization Of Airflow Distribution In Tube Wet Electrostatic Precipitator For Coal Fired Boiler Flue Gas Purification

Tube W-ESP is composed of multiple wire-pipe electrostatic precipitators in parallel.The efficiency will be decreased if the gas flow deviation is too large.CFD numerical simulation technology was used to analyze,organize and optimize the internal air flow distribution of a heating power company 116 MW unit supporting W-ESP.On the basis of meeting the requirements of the gas flow distribution of the electrostatic precipitator,the gas flow deviation of the single tube was controlled within a certain range,in order to ensure that W-ESP could meet the requirements of emission standard.The test results showed that outlet dust concentration achieved the emission requirements.Numerical simulation method could provide a reference for tubular W-ESP design.In this paper,the internal airflow distribution of a heating power company 116 MW unit supporting W-ESP was simulated by using the computational fluid dynamics method.The improved scheme was proposed by analyzing the flow field of the original design scheme,and the optimization results are as follows:(1)After the optimization,The mean square root values of the gas velocity distribution on the inlet section of every electric field partition were less than 0.19.The distribution of velocity tend to uniform and met the technical specifications that the mean square root values of the gas velocity distribution on the electric field partition were less than 0.25.(2)There are only two honeycombs whose flue gas flow deviation exceeded 15%.The optimized results could meet the technical requirements of the project.(3)The test results showed that outlet dust concentration was less than 5 mg/m3.The reliability of the numerical simulation method was verified which showed that the numerical simulation results could be used to guide the design of vertical honeycomb W-ESP.