Study On Collecting Potential Of Cathode And Anticathode Of Electrostatic Precipitator

Emission standard of air pollutants for thermal power plants(GB13223-2011), which was implemented in January1st,2012, hasstipulated that the dust emission concentration of coal-fired boiler inthermal power plant is limited to30mg/Nm3and the dust emissionconcentration of some exceptional key areas shall not exceed20mg/Nm3.This standard equipment for thermal power plant electrostatic precipitatora higher technical requirements.In this paper, spoiler and conductive filter planks was studied bynumerical simulation. The Gambit software was used to build the model.The airflow distribution was simulated by the Fluent soft ware. In order toobtain the optimal shape for spoiler, flow filed of the ESP with differentshapes spoiler was simulated. Results show that: setting the Spoiler canform a low velocity zone in the vicinity of the corona wire, conducivecathode dust collection; the spoiler in the shape of and 〔can makethe flue gas velocity be well-distributed. By changing the mountingposition of the conductive filter tank, flank height, width, holing rate,obtained different air-flow distribution. The numerical simulation resultsshow that: setting the Spoiler after the anode plate can form a low velocityzone in the behind of the anode plate, conducive to the collection of dust;decrease the mounting distance, the airflow distribution tends to beuniform; the flank height does not affect the flow distribution and theamount of gas that enter the condu ctive filter plank; with the increase ofthe width, the air-flow distribution inside the electric field tends to beuneven, but gas enter the conductive filter plank increases, so the widthcan be adjusted according to demand; when the holing rate is50%, theair-flow distribution is best. The simulation results of the conductive filterplanks and groove planks show that: replace the groove planks withconductive filter planks has little effect on the airflow distribution of thefront of the electrostatic precipitator; conductive filter planks is moreconducive to improving the uniformity of the air distribution. Thenumerical results of this paper provide a theoretical basis for the designand modification of electrostatic precipitator.