Flow Field Simulation And Optimization,Performance Test And Initial Design Of Wet Electrostatic Precipitator With High Efficiency

One of the important reasons for the formation of smoggy weather is the huge load of fine particles discharged by coal-fired boilers.Wet electrostatic precipitator(WESP)is an ideal device to control the formation of haze.It is mainly used to remove the fine particles in the wet gas,acid mist,PM2.5(usually trace),etc.In this paper,performance test and flow field optimization analysis of the WESP for a220t/h boiler is carried on by means of engineering tests and flow simulation optimization.Based on the simulation experience,we can make research on the flow field and structure optimization with the WESP for a 300 MW unit.Then,the structure design of it is developed.Flow field simulation and optimization results of the WESP for a 220t/h boiler show that: factors affecting the dust removal efficiency of WESPs are generally divided into two aspects of the structure size and flue gas properties.On the hand of flue gas properties,10% of the flue gas humidity can make the specific resistance of dust in the flue gas in the best working area.It is helpful to enhance the efficiency of WESPs.On the hand of structural dimensions,faster gas flow rate and uniform flow field is conducive to the efficient removal of fine particles.Due to the body structure,the air flow is unevenly distributed in those WESPs with non-uniform inlet.There are obvious areas of high speed and low speed,which need to be optimized.After the non-uniform inlet model is optimized,the airflow distributes uniformly through the shunt of the airflow distribution plate.Further,flow field simulation of the WESP with the 300 MW unit is carried out.And the calculations proves that: compared to the original model of the speed distribution,the velocity profile of the anterior section into the anodic system in the optimization scheme,the speed distribution of the optimization scheme has been significantly improved.It does not appear very obvious high-speed area and low speed area,and it is more uniform.According to the simulation result,the project design of wet electrostatic precipitator for 300 MW unit was carried out.