Using The Numerical Simulation Method To Simulate Gas Flow Distribution In Converter Gas Dedicated Electrostatic Precipitator

Along with the requirement of the sustainable development of the country, therecovery and utilization of converter gas has been got a greater appreciation by iron andsteel production enterprises. Moreover, improving the quality of the converter gas isextremely important to this special industry. Currently, the dust concentration of theconverter gas reclaimed from the iron and steel enterprises in China is10~100mg/m3essentially. If use the gas to generate power, a wet electrostatic precipitator should beadded in front of gas tank, and then dust concentration can attain lower than1mg/m3,satisfying the demand of fine dust removal. Considering that the gas flow distribution isone of the crucial factors influencing the efficiency of the electrostatic precipitator and theconverter gas, while because of high CO content of converter gas, it will explode in thepresence of oxygen easily. It can be guaranteed the dedicated electrostatic precipitatorapplied to converter gas and provide a dependable foundation, only good control of thegas flow distribution of the electrostatic precipitator so as to keep the gas layer slug flow.In this paper, two mathematical models are established employing the Fluent. One isbased on the simplified square electrostatic precipitator used in a steel mill and the otherone is the model of the cylindrical electrostatic precipitator which is set up following theprinciple of equal rate of flue gas. Then the gas flow distribution of the two electrostaticprecipitators is analyzed, providing the details of the gas inside the precipitators. Bychanging the number, the location and the porosity of the gas flow distribution board, thisstudy explores the differences of the gas flow distribution between the two electrostaticprecipitators and illustrates the superiority of the cylindrical electrostatic precipitator. Inthe last part of the essay, the reliability of the numerical simulation of the gas flowuniformity in the model test, taking the square electrostatic precipitator as the platform, isverified.The result shows that the cylindrical electrostatic precipitator has a better gas flowdistribution than the square one. When the flow meets the first distribution board, thestatic pressure increases suddenly. When it goes to the second one, the static pressure doesnot change obviously. When two distribution boards are installed, the best porosity in the front of the cylindrical electrostatic precipitator is30%and the one in the back is35%.The best locations of the boards are respectively1.58m and2.36m from the hornentrance. The dependability of the calculation results employed in this paper has beenrecognized by the model test.