| Summary: | 碩士 === 國立聯合大學 === 環境與安全衛生工程學系碩士班 === 98 === The purpose of this research was to develop a new direct-heated catalytic bed by utilizing the Joule effect thus catalysts would be directly heated by a thin-film resistor. The advantages of this novel catalytic fixed-bed include high energy efficiency and shorter warm up time. The operation parameters, including operating voltage, space velocity, relative humidity and inflow concentration were investigated on their influences on the performance of this direct-heated catalytic fixed-bed. Toluene, acetaldehyde and ethylene glycol monoethyl ether acetate (EEAc) were chosen to represent different volatile organic compounds to test the direct-heated catalytic fixed-bed. Take the toluene experimental result as the example, when the operating voltage is 55 volts, the space velocity is 3609 h-1, the relative humidity is 11% and the inflow concentration is 147 ppm, the destruction efficiency of toluene is 84%. The operating voltage enhance to 65 volts, the destruction efficiency enhancement to 96%. The space velocity was reduced to 1444 h-1, the destruction efficiency up to 99%. Simultaneously, the destruction efficiency of acetaldehyde and EEAc is similarly reaches as high as 95% and 99% respectively. The relative humidity enhance to 65%, the destruction efficiency of toluene was reduced to 80%. Finally, enhancement of the inflow concentration of VOCs to 304 ppm, the destruction efficiency of toluene has not affected nearly and the value is 83%.
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