The widely utilized high efficient particulate air filters(HEPA)and electrostatic precipitator(ESP)respectively has the shortcomings of relatively high energy consumption and low filtration efficiency.In order to over...The widely utilized high efficient particulate air filters(HEPA)and electrostatic precipitator(ESP)respectively has the shortcomings of relatively high energy consumption and low filtration efficiency.In order to overcome the disadvantages of two traditional air filtration system,electrostatic assisted air filtration system(combining HEPA and ESP)has been proven to achieve high filtration efficiency and low energy consumption simultaneously.Predicting of V-I characteristics of electrostatic filtration system with configuration of“pin to filter medium to grounded device”is very essential and challenging due to the back corona phenomenon.This study utilized the back-corona based current model to predict the V-I characteristics of electrostatic system with different filter medium types and“pin-to-filter”distances.Experiments are conducted to provide data for model validation by changing filter types and locations of discharge pin.The results indicated that both of the predicted values of total discharge current and back-corona induced current agreed well with the experimentally measured data.This validated mathematical model could be used for preliminary design of electrostatic assisted filtration system with configuration of“pin to filter to grounded device”.Based on the V-I characteristics predicted by the semi-empirical model,the electrostatic filtration efficiency could be estimated.展开更多
燃气轮机进气过滤系统是保护压气机叶片和燃气透平的重要设备,但其设计和运行过程中的重要性常常被忽略。分析了空气污染物对燃气轮机的危害以及进气过滤系统对燃气轮机运行安全的影响,介绍了进气过滤器和滤材特性对进气过滤系统性能的...燃气轮机进气过滤系统是保护压气机叶片和燃气透平的重要设备,但其设计和运行过程中的重要性常常被忽略。分析了空气污染物对燃气轮机的危害以及进气过滤系统对燃气轮机运行安全的影响,介绍了进气过滤器和滤材特性对进气过滤系统性能的决定性作用。同时,根据国内燃气电厂实际运行情况,指出目前进气过滤系统运行存在的主要问题和原因,计算了进气过滤系统压降对燃气轮机性能的影响大小,分析了进气过滤器抗湿性能和消静电的实验结果。根据实验结果,建议采取加强采购抽检,根据标准EN 779—2012 Particulate Air Filters for General Ventilation-Determination of the Filtration Performance严格执行消静电、抗湿性标准试验的应对策略,确保进气过滤系统具有良好的性能,保证燃气轮机安全高效运行。展开更多
基金The authors would like to acknowledge the coordinated support from Natural Science Foundation of China(Grant No.51808138,51778385,51878442).
文摘The widely utilized high efficient particulate air filters(HEPA)and electrostatic precipitator(ESP)respectively has the shortcomings of relatively high energy consumption and low filtration efficiency.In order to overcome the disadvantages of two traditional air filtration system,electrostatic assisted air filtration system(combining HEPA and ESP)has been proven to achieve high filtration efficiency and low energy consumption simultaneously.Predicting of V-I characteristics of electrostatic filtration system with configuration of“pin to filter medium to grounded device”is very essential and challenging due to the back corona phenomenon.This study utilized the back-corona based current model to predict the V-I characteristics of electrostatic system with different filter medium types and“pin-to-filter”distances.Experiments are conducted to provide data for model validation by changing filter types and locations of discharge pin.The results indicated that both of the predicted values of total discharge current and back-corona induced current agreed well with the experimentally measured data.This validated mathematical model could be used for preliminary design of electrostatic assisted filtration system with configuration of“pin to filter to grounded device”.Based on the V-I characteristics predicted by the semi-empirical model,the electrostatic filtration efficiency could be estimated.
文摘燃气轮机进气过滤系统是保护压气机叶片和燃气透平的重要设备,但其设计和运行过程中的重要性常常被忽略。分析了空气污染物对燃气轮机的危害以及进气过滤系统对燃气轮机运行安全的影响,介绍了进气过滤器和滤材特性对进气过滤系统性能的决定性作用。同时,根据国内燃气电厂实际运行情况,指出目前进气过滤系统运行存在的主要问题和原因,计算了进气过滤系统压降对燃气轮机性能的影响大小,分析了进气过滤器抗湿性能和消静电的实验结果。根据实验结果,建议采取加强采购抽检,根据标准EN 779—2012 Particulate Air Filters for General Ventilation-Determination of the Filtration Performance严格执行消静电、抗湿性标准试验的应对策略,确保进气过滤系统具有良好的性能,保证燃气轮机安全高效运行。
