應用非熱電漿技術處理二氯甲烷及酚之初步研究; Preliminary Study on Removal of Dichloromethane and Phenol from Gas Streams with Non-thermal Plasma

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Title:	應用非熱電漿技術處理二氯甲烷及酚之初步研究;Preliminary Study on Removal of Dichloromethane and Phenol from Gas Streams with Non-thermal Plasma
Authors:	賴祺仁;Chi-Ren Lai
Contributors:	環境工程研究所
Keywords:	內電極形式;去除效率;最終產物;反應機制;非熱電漿技術;酚;二氯甲烷;剝漆過程;操作參數;non-thermal plasma;phenol;product;removal efficiency;dichloromethane
Date:	2003-07-04
Issue Date:	2009-09-21 12:15:44 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本研究以高頻(30~40 kHz)電源供應器搭配介電質放電反應器進行二氯甲烷及酚之破壞及去除實驗，選定剝漆過程中常逸散出之二氯甲烷及酚氣體作為實驗對象。本研究將分為兩部分進行討論，一為分析非熱電漿系統中內電極形式之影響，嘗試以不同形式、材質及樣式之內電極進行研究探討。另一方面針對非熱電漿系統中操作參數與揮發性有機氣體去除率之關係作一系列之研究，操作參數包含了輸入放電頻率、進流濃度、氣流停留時間、水氣含量及攜流氣體等。並根據反應機制量整與偵測結果以探討說明應用非熱電漿處理二氯甲烷之最終產物及可能反應途徑。根據本研究結果顯示應用不同形式或材質之內電極將對有機物之去除及反應器溫度變化皆有相當的影響。統整效率及系統穩定性來看，本文建議使用以纏繞方式將不鏽鋼材質之細線覆於中空玻璃管外壁作為內電極進行操作。本研究對單純含二氯甲烷或酚氣流進行實驗，結果發現放電頻率、進流濃度、氣流停留時間、水氣含量與攜流氣體等參數皆為影響有機物去除效率的重要因子。然而在特定操作參數時應用本技術皆可達90％以上之去除效率，所生成最終產物分別為CO、CO2、NO2、N2O、O3及HCl與CO、CO2、HNO3、N2O、NO2及O3。併同處理含有二氯甲烷及酚氣流時發現，當氣流中二氯甲烷濃度變化大時，對去除效率之影響也隨之激烈;但對酚氣體而言，濃度變化對去除效率之影響則不顯著。收集整理應用觸媒處理二氯甲烷技術之成果與本處理系統做比較。此系統仍然會產生與應用氧化法或氫化法技術之相同最終產物，如CO、CO2、HCl等。針對國外應用電漿放電處理技術做比較，顯示本系統亦能達到相當之去除率。 Decomposition and removal chlorinated and aromatic hydrocarbons via non-thermal plasma processing at atmospheric pressure were investigated. The target VOCs selected for study include dichloromethane (DCM) and phenol which are commonly used in industry as resolvents and thinners. A bench-scale experimental apparatus has been designed and constructed in this study for evaluating the effectiveness of DBD plasmas for removing selected organics from gas streams. Dependencies of removal efficiency achieved with DBD on operation parameters including applied frequency, gas flow rate, inlet DCM concentration, humidity and composition of the gas stream and analysis of by-products are investigated. Experimental results show that the removal efficiency of selected compounds (DCM) increased with application of higher frequency and longer gas residence time. However, removal efficiency of DCM was found to decrease with increasing inlet DCM concentration and gas flow rate. The major products of DCM processing in air include CO, CO2, NO2, NO, N2O and HCl. Removal of phenol was also investigated in this study, results indicated this non-thermal plasma get high removal efficiency for phenol removal and byproduct such as CO, CO2, NO2, NO, HNO3 would be produced during the process. Experimental results demonstrate the technical feasibility of applying this non-thermal plasma system for removing DCM and phenol from gas streams.
Appears in Collections:	[Graduate Institute of Environmental Engineering ] Electronic Thesis & Dissertation

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