The Optimization Research Of Bag Filter Reformed From Electrical Precipitator Engineering Design Based On CFD

Many Electrical Precipitator have to be reformed to meet the strict environmental protection standard under the severe environmental pressure. Compared with other transformation methods, Transforming Electric Precipitator into Bag Filter has the advantages of shorter rebuilding cycle, low cost, easy to achieve emissions standards, and has been widely accepted by people. In the design process of transforming Electric Precipitator into Bag Filter, Using the numerical simulation technology can be good for us to forecast and optimize the internal air distribution of the Bag Filter, and it can provide the reference for the design and optimize of transforming Electric Precipitator into Bag Filter.This paper take a company engineering project "Transforming Electric Precipitator into Bag Filter" as the research object. Using the numerical simulation technology to simulate internal air distribution of the filter after first and second time transformation. For the first time after the filter transformation, the gas flow distribution performance of the filter is poor, the operation resistance of the system is also big; and the internal air distribution is non-ideal, especially the airflow velocity of the bottom of filter bag near the end of the Bag Filter’s duct is about12m/s, it seriously affect the service life of the filter bag. However, the gas flow distribution performance of the filter has improved after the filter transformed again, and the operation resistance of the system has reduced100pascal compared with the first transformation, the energy consumption has been reduced greatly. Although the air distribution trend is similar between the two transformations, the airflow velocity of the corresponding bag filter bottom has reduced4m/s and improved a lot, In the end, through adding rectifying device in the air duct of the filter to optimize the air distribution, and has achieved good effect. The gas flow distribution performance of the filter is up to the "superior" standard after adding the rectifying device, and the airflow velocity of the bottom of each bag filter has reduced greatly, the highest speed just5.0m/s, the performance of the filter has been improved further. The system has run well after the filter had been reform, smoke abatement concentration is lower than30mg/m3, reached the nation’s standard, and the operation resistance is also lesser. This paper numerical simulation results are basically the same to the practical operation test data, it proved that the numerical simulation results is reliable, and the numerical simulation technology has good guidance significance for the design of transforming Electric Precipitator into Bag Filter.