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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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