Abatement of Dichlorodifluoromethane by Full Scale DC Plasma Torch and Production of Cryolite

• Main Authors: CHEN, PO-HAN, 陳柏翰
• Other Authors: TSAI, CHENG-HSIEN
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/7ng94k

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 106 === Abatement of Dichlorodifluoromethane by used full-scale DC plasma torch that used Nitrogen as carrier gas and added Hydrogen as additive. Discuss the effect of different additive ratios of Hydrogen on abatement of Dichlorodifluoromethane and changes over time in the plasma torch. Analysised of by-products using a bench-top Mass Spectrometer. And simulation of fluorine-containing waste water produced by the plasma torch in the laboratory through the addition of aluminum sodium solution to produce cryolite. Experimental parameters [CCl2F2]in = 10 slm, [N2]in = 38.5 to 39.5 slm, [H2]in = 1000 to 1500 sccm, total flow was 50 slm, CCl2F2 concentration was 20%, H2 addition concentration was 1 to 3%, output voltage was 120 V, output current was 100 ~ 130 A, output power was 15.4 kW. According to article 3 paragraph 2 of the Factory Management Counseling Law of the Ministry of Economic Affairs that the plant area of more than 50 square meters and horsepower and electic heat totaled more than 2.56kw was factory scale. The study conformed that conditions so was a full scale study. Maximum abatement efficiency was 99.6% ~ 99.99%. That 17 posible products were detected by Mass Spectrometry. And XRD analysis confirmed that successful synthesis of cryolite by HF was added to self-formulated aluminum and sodium solution. The study confirmed that the addition of H2 can effectively enhance the effect of plasma abatement CCl2F2, and the abatement effect is up to 99.99% as specified in the Montreal Protocol. The Mass Spectormetry was used to analyze the by-products generated by the plasma torch. It was determined that the self-prepared aluminum and sodium solution was added to the fluorine-containing solution to generate cryolite, and the Chlorofluoromethane treated resources were reused to increase the economic value of the system.