| 摘要 |
PURPOSE:To improve the electric charging efficiency to fine particles as well as to kill microorganisms by heating a photoelectron emitting material or its vicinity and projecting ultraviolet rays and/or radiant rays in the gas cleaning method in which the fine particles in a gas are removed by electrically charging them with photoelectrons. CONSTITUTION:The air 24 containing microorganisms is sucked by a fan part 8 and is filtered by a prefilter 20, and then fine particles in the air are electrically charged in an ultraviolet irradiation art 9 consisting of the photoelectron emitting material 21 with a built-in heater and an ultraviolet lamp 22. These charged fine particles are caught by a charged fine particle catching filter 23, and a clean air 25 is obtained. In this case, the emission of photoelectrons is promoted by the irradiation of the heated photoelectron emitting material 21 by the ultraviolet lamp 22 in the ultraviolet irradiation part 9, and the fine particles in the air are efficiently charged, and the microorganisms are completely killed because the heat energy is added to the energy of ultraviolet rays. The heater heats the photoelectron emitting material 21 or its neighborhood.
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