مدل سازي و شبيه سازي ته نشين ساز الكتروستاتيكي و بررسي تاثير مشخصه هاي عملياتي بر روي عملكرد آن

چكيده انگليسي :

77 Modelling and Simulation of Electrostatic Precipitator and Investigation of Operation Parameters on Collection Efficiency Mohammad Reza Tavoosi mr tavoosi@ce iut ac ir November 15 2014 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiArjomand Mehrabani Prof arjomand@cc iut ac ir AbstractFrom ways that can help in this regard the use of methods to prevent emissions to the surroundingenvironment Due to the size of dust particles none of the solid gas emissions systems such as cyclones filters or cleaning fibers can be useful in this way These systems have low efficiency in this range and inaddition it has a lot of pressure drop and quickly become saturated But the electrostatic precipitatorinstruments in addition to high performance they can remove very small particles of pollutants In thisproject the performance of an electrostatic precipitator with three wire electrode and the drain electrodecollector plate has been investigated and the effect of different operating parameters on its operation has beenstudied by mathematical modeling A two dimensional geometry of the problem has been considered and theelectric field and the concentration of particles have been simulated by solving the corresponding equationsand obtained by a computer program Needed data to run the program including gas flow rate voltage andcurrent of an electrostatic precipitator the concentration of the incoming particles mobility diffusioncoefficient device dimensions and the results of a computer program include sediment maker in various partsof the electric field the voltage in different parts of sediment concentration and returns the number ofparticles have been collected As it comes from the simulation and calculation when the space variables hadbeen considered at low voltages with lower diffusion coefficient of 30 to 0 6 the collection efficiency ofsediment maker increased about 2 3 percent and it increased 1 5 as diffusion coefficient decreased from 10to 0 6 and at high voltages did not affect diffusion coefficient change and at the highest state it had beencaused 0 06 increasing of efficiency If the applied voltage and Space are held constant 20000 volt themore increase of diffusion coefficient the more decrease the efficiency of the sediment maker and collectionefficiency around 1 3 was decreased as diffusion coefficient give change from 0 6 to 30 By changing thevoltage from 7000 to 10 000 volts at constant diffusion coefficient of 30 sediment maker Collectionefficiency 0 016 and the residual voltage of 7 000 to 20 000 volts Collection efficiency was increased0 027 Using second geometry which includes 9 discharge electrode wire had not a great impact onimproving the collection efficiency and was caused 0 11 increasing at the highest state The results areconsistent with the actual values the difference is negligible due to the simplifying assumptions in solvingequations and simulations of the system Key Words Electrostatic precipitator Space charge density Discharge electrode Collection efficiency

طاوسي، محمدرضا

مدل سازي و شبيه سازي ته نشين ساز الكتروستاتيكي و بررسي تاثير مشخصه هاي عملياتي بر روي عملكرد آن