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Eohanced Collection Efficiency of Submicron Particles by Electrocyclone
行，旋風集塵器入口流速控制在5.7 ~ 26.0 M/S之間，施加電壓介於0 ~
50 Kv，次微米 微粒的來源為在實驗室中利用曝氣法混合hcL及 nh4oh而
生成之氯化銨微粒。. 研究結 果顯示，於旋風集塵器內施加電場可大
增加而減小，效率最高可達86 %。電極棒的直徑愈小，有愈佳的效能 表
The submicron particles were the most difficult to be collected by the conve ntional dust removal devices. The purpose of this study was to investigate the applicability of using an electrocyclone to collect the submicron particles. The electrocyclone were Stairmand high-efficiency and tangential inlet-type wi th electrode inserted into the center of cyclone outlet. Two cyclones were tes ted in this study and their diameters were 13.3 cm and 25.0 cm. Totally four e lectrodes of various diameters and lengthes were used and the experiments were conducted under various inlet flow velocities, applied voltages, and mass loa dings. The inlet velocities and the applied voltages were varied between 5.7 t o 26.0 m/s and 0 to 50 kV, respectively.The submicron particles were ammonium chloride aerosols generated by mixingthe vapors of HCl and NH4 OH. The results showed that The electric field significantly improve theperformance of submic ron particles. Such enhancement effect was reduced withhigher flow rate. The b est collection efficiencies of the ammonium chlorideaerosols by the electrocyc lones could achieve to 86 %. Thinner electrode was more effective than the thi ck one. However the shorter electrode was found more economical. In general th e larger electrocyclone was less effective than the smaller one under the same operational condition, but both had the same efficiency when both consumed th e same corona power ratio. It indicated that the corona power ratio was the un ique parameter to determine the collection efficiency of the submicrone partic les by using electrocyclone.
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