| Summary: | 碩士 === 國立交通大學 === 環境工程所 === 87 === The non-thermal plasma technique has not become a mature technique up to the present, based on the complex factors such as input voltage to the reactor, style of electrode and dielectric barrier, inlet concentration of pollutant, carrier gas, contents of oxygen and moisture, retention time and temperature etc. This study intends to establish optimal conditions of operation parameters such as applied voltage, inlet concentration of pollutant, and gas flow rate. The operation parameters were evaluated systematically. The power consumption and the cost-effectiveness for achieving the target decomposition rate are also calculated. The method to evaluate optimal operation parameters and cost-effectiveness is that both the decomposition efficiency and minimum power consumption should be satisfied.
The results showed that a packed bed plasma reactor has a higher toluene decomposition efficiency and a lower marginal power consumption cost than the non-packed bed plasma reactor. The toluene decomposition efficiency increases as both the inlet gas flow rate and the toluene gas concentration are decreased. For a plasma reactor of 2 cm in diameter, an over 90% toluene destruction can be reached at a gas flow rate of less than 680 cm3/min, no matter the inlet toluene concentration is high or low. But if the gas flow rate is raised to 1000 cm3/min, then the toluene inlet concentration has to be less than around 500 ppm to achieve high toluene destruction. Under the optimal operation condition, the cost-effectiveness is 15g/kWh. It is also proved that high gas flow rate treatment could be accomplished via multi-tubes reactor.
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