PURPOSE: To efficiently decompose the odor components in the combustion waste gas of a roaster by bringing the combustion waste gas into contact with the semiconductor having a forbidden band width of 0.5-5eV under the irradiation of ultraviolet rays.
CONSTITUTION: The deodorizing device 21 has the hermetic chamber provided with a combustion waste gas introducing opening 22 and a combustion waste gas discharge opening 23. The filter 6 in which the above-mentioned semiconductor used in this method is supported with electret filters or cray are fixed on the waste gas introducing opening and discharge opening, on the floor and ceiling, and as the filter plates partitioning the device into three chambers. Ultraviolet ray radiation units 7 which consists of ultraviolet ray lamps and is connected with an outer electric power source are disposed in each partitioned section to irradiate the filters with ultraviolet rays. This deodorizing device is set in a roaster as well as in a exhaust duct of combustion waste gas, and has an excellent removing capacity of aldehyde components in a gas.
SEKIGUCHI KENICHI
NATSUUME YOSHIO
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