Destruction of ozone-depleting substances in a thermal plasma reactor

Abstract

A two-dimensional numerical model of the PLASCON™ plasma reactor is used to investigate the destruction of ozone-depleting substances in the reactor. The model includes electromagnetic, fluid dynamic and chemical kinetic phenomena. Calculated temperature, flow and species concentration fields within the plasma torch, the injection manifold and the reaction tube are presented for the case of the destruction of CFC-12 (CF2Cl2). Conversion of CFC-12 to CFC-13 (CF3Cl), a more stable ozone-depleting substance, is found to occur in the region close to the injection manifold, and to be unaffected by reaction tube geometry. CFC-13 is predicted to be the dominant ozone-depleting substance in the exhaust gas. The predictions of the model are found to be in good agreement with measurements of the exhaust gas composition.

Water Plasmas for Environmental Application

“…Applications of DC argon plasma for halogenated hydrocarbon decomposition have been operated with injection of oxidizing gas such as steam and oxygen to the plasma jet [11][12][13][14][15]. A 150-kW plant for decomposition of Australian's stockpile of halons has been opened in Melbourne.…”

“…Waste decomposition using thermal plasmas has been reported for various kinds of wastes, such as halogenated hydrocarbon [10][11][12][13][14][15][16][17][18][19][20][21][22][23], polychlorinated biphenyl (PCB) [24,25], hydrocarbon [26][27][28], polymer [29][30][31], organic waste [28,[32][33][34][35][36][37], used tires [38][39][40], and medical waste [41,42]. Waste materials can be efficiently degraded by thermal plasmas under reducing or oxidizing conditions.…”

Decomposition of HFCs using Steam Plasma

“…이들 폐 냉매에 대한 처리기술로는 1) 열분해법 (Wang et al, 1998), 2) 촉매산화법 (Bonarowska et al, 2001), 그리 고 3) 플라즈마를 이용한 공정 (Watanabe and Tsuru, 2008;Kossyi et al, 2001;Glocker et al, 2000;Murphy and McAllister, 1998 Narengerile et al, 2009;Watanabe and Tsuru, 2008;Kim and Park, 2008;Ohno et al, 2007;Yu et al, 2006), 이들 화학종은 아래 반응식 (2)~(4)와 같은 경로를 통해 물을 공급하여 제공할 수 있다 (Sekine et al, 2011;Wang et al, 2010). 참 고 문 헌…”

Treatment of Hydrogen Fluoride Generated from the F-gases Decomposition Processes

“…However, with the above-mentioned technologies, there are many problems such as a low decomposition efficiency, high operating cost, and the formation of by-products: NO x , SO x , HF, CO 2 , etc (Mi et al, 2015;Park et al, 2013;Wang et al, 2004;Bonarowska et al, 2001;Wang et al, 1998). Afterward, the plasma process and electronbeam system have been exploited for improving previous technologies (Son et al, 2016;Ryu et al, 2012;Watanabe et al, 2008;Kossyi et al, 2001;Glocker et al, 2000;Murphy et al, 1998). Meanwhile, Park et al (2013) reported that the plasma process obtained a high decomposition efficiency of PFCs when using hydrogen gas as an addictive.…”