觸媒結合脈衝放電系統處理甲苯氣體之研究

Abstract

以非熱電漿法去除空氣中有害氣體，為近年來所發展之新穎技術，如何有效提升污染物之去除效能，為此項技術於設計上之研究重點。本研究探討如何提升脈衝電暈放電（Pulsed Corona Discharge）反應器對甲苯氣體之去除效能，在操作上比較傳統空床未填充、填充玻璃珠與結合鎳、錳、銅等觸媒對去除效能之影響。研究結果顯示，將脈衝放電反應器中使用玻璃珠填充方式，以及結合錳、銅觸媒之操作條件下，並不能明顯增進反應系統之去除效能，結合填充鎳觸媒之操作方式有著較佳之去除效率，研究顯示空床未填充時，脈衝放電對甲苯之去除率為73.50％，結合 3.62％Ni/Glass之觸媒時，對甲苯之去除效率為92.28％，明顯提昇了18.78％。 能量效益方面，使用鎳觸媒填充之方式，除了有助於提高去除率外，更可使得系統對甲苯去除之最佳能量效益，從低去除率之條件往高去除率之操作點偏移，並且使得操作能量之使用率更為經濟，本研究最佳能量效益由大至小依序為3.62％Ni/Glass：96.43 g/kWh > 1.72％Ni/Glass：75.80 g/kWh >未填充：50.56 g/kWh >玻璃珠：35.80 g/kWh。此外，臭氧伴隨著放電而生成，而填充介質後，臭氧濃度有被抑制下降之趨勢，其中臭氧濃度產生之高低依序為未填充者>填充Glass者>填充1.72％Ni/Glass>填充3.62％Ni/Glass，因此鎳觸媒含量較多者，最能達到降低臭氧排放之功效。

Removal of hazardous air stream by non-thermal plasma process is a new technology in recent years. And it is important to study on how to improve the removal efficiency of pollutants. This study discusses on how to increase the removal efficiency of toluene in pulsed corona discharge reactor, and comparing the influence with packed types, such as packing with glass ball, Ni, Mn and Cu catalysts as well as without packing. The results indicate that the best removal efficiency is achieved by using Ni-catalysts. The removal efficiency also increases with increasing the Ni-catalysts loading. When using traditional pulsed corona discharge that without any packing materials, the removal efficiency is 73.50%, while using 3.62%Ni/Glass, the removal efficiency for toluene is increased by 18.78% to be 92.28%. The Ni-catalysts also increase the energy efficiency for toluene. The best energy efficiency on this study is 96.43 g/kwh by 3.62%Ni/Glass, this is morn than 75.80 g/kwh by 1.72%Ni/Glas, 50.56 g/kwh by unpacked, 35.80 g/kwh by glass ball packings. Besides, the ozone concentration also increases with increasing voltage. But when packing with Ni-catalysts, the ozone concentration is decreased, the ozone concentration decreases in sequence by unpacked type, glass ball packing, 1.72%Ni/Glass and 3.62%Ni/Glass. So high loading of Ni catalysts can not only increases the toluene destruction but also decreases the ozone concentration best.