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《Journal of Zhejiang University(Engineering Science)》 2009-09
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Detection of sheeting in polyethylene gas-solid fluidized bed by measuring electrostatic current

WANG Fang1,YU Heng-xiu1,2,REN Cong-jing1,WANG Jing-dai1,YANG Yong-rong1(1.State Key Laboratory of Chemical Engineering,Polymer Reaction Engineering Division,Zhejiang University,Hangzhou 310027,China;2.Changling Military Deputy Office of SINOPEC,Yueyang 414012,China)  
Electrostatic current(EC) signals at different positions in the polyethylene gas-solid fluidized bed with sheeting were investigated respectively with the reference to the non-sheeting fluidization condition.Results showed that EC was sensitive to the different kinds of sheeting,including sheeting on column wall,asymmetrical and symmetrical sheeting on distributor.Then a new method to detect sheeting was proposed based on EC.The method estimated the position of sheeting through changes of EC's mean value(MV) and standard deviation(STD).Results showed that EC's MV and STD in the bed without sheeting were axial symmetrical,while the formation of sheeting on the column wall and asymmetrical sheeting on the distributor destroyed the symmetry of EC in a certain region.The former primarily influenced the fluidization condition of the zone under the sheeting,while the latter significantly affected the zone near the distributor,both of which resulted in the greater differences of EC's MV and STD between the regions of the fluidized bed without and with sheeting.Symmetrical sheeting on the distributor had little influence on the symmetry of the fluidization condition,but EC's MV and STD were both greater than the results from the bed without sheeting.
【Fund】: 国家自然科学基金资助项目(20490205)
【CateGory Index】: TQ021.8
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