| 摘要 |
<p>PURPOSE:To miniaturize the apparatus and to easily maintain the operation by preliminarily removing electrostatically charged fine particles in a gas and electrostatically charging the noncharged fine particles in an gas cleaning method for removing the fine particle in the gas by photoelectrons. CONSTITUTION:The air 24 containing electrostatically charged fine particles is flowed through a preliminary catching filter 9 where positive and negative charged fine particles are removed. Then, neutral (noncharged) fine particles are electrostatically charged by an ultraviolet irradiation part consisting of a photoelectron emitting material 21 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, photoelectrons are emitted in the ultraviolet irradiation part 10 by irradiating the photoelectron emitting material 21 with ultraviolet rays from the ultraviolet lamp 22. By these photoelectrons, the fine particles in the air 24 are efficiently charged. As the charged fine particles are preliminarily removed, the photoelectrons are efficiently acted to charging due to low density of fine particles to be charged.</p> |
