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Experimental study on CCl_4/CH)4/O_2/N_2 oxidation

science china(Technological sciences) 2010年第4期53卷 1016-1022页

作者： wang bo1,2.chi yong2.yan jianhua2.& ni mingjiang2.1 college of energy and power engineering,university of shanghai for science and technology,shanghai 2.0093.china 2 State Key Laboratory of Clean energy Utilization,Zhejiang university,Hangzhou 310027,china college of energy and power engineering University of Shanghai for Science and Technology Shanghai China State Key Laboratory of Clean energy Utilization Zhejiang University Hangzhou China

Oxidation within the system CCl4/CH4/O2/N2 is studied at atmospheric pressure in a tubular flow reactor to investigate the influence of reaction temperature and chlorine content on chlorinated waste combustion and find incineration process optimization methods for pollution *** reaction temperature varies from 700℃ to 1000℃ and the CCl4/CH4(or Cl/H) mole ratio of the inlet mixture varies from 0.21 to *** profiles are measured with *** is shown that at the same initial CCl4 concentration and reaction temperature adding CH4 favors CCl4 destruction and CO2 *** the destruction and removal efficiency(DRE) of CH4 decreases with lower Cl/H and higher concentrations of toxic products of incomplete combustion such as COCl2 and CH3Cl are formed at the same *** chlorine in the system favors CH4 decomposition,but it also inhibits further oxidation of *** temperature assists in both CCl4 destruction and CH4 conversion,and the concentration of toxic combustion intermediates is *** the temperature is the most effective way to enhance CCl4 *** CO2 concentration increases with temperature.A CO concentration peak is observed around 800℃:with a certain Cl/H,the CO concentration first increases with temperature and then *** effect of increasing CH4 concentration on CCl4 destruction becomes mild above 900℃.Rather,it enhances the interaction between chlorine and carbonaceous radicals,which leads to higher concentration of toxic products.

关键词： hazardous waste destruction and removal efficiency(DRE) oxidation carbon tetrachloride chlorinated compounds methane

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Influence of chlorine on methane oxidation

引用

Journal of Environmental sciences 2009年第9期21卷 1315-1320页

作者： chi yong wang bo yan jianhua ni mingjiang Institute for Thermal power engineering State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China. School of energy and power engineering University of Shanghai for Science and Technology Shanghai 200093 China

Experiments on CH4/Cl2/O2/N2 oxidation were conducted in an atmospheric pressure flow reactor to understand the influence of chlorine on hydrocarbon oxidation in hazardous waste incineration. The reaction temperature varied from 973 to 1273 K and the chlorine to hydrogen mole ratio （Cl/H） of the irdet mixture varied from 0 to 0.44. The species produced in the reaction were measured online with Fourier transform infrared spectroscopy （FT-IR）. It was found that the destruction and removal efficiency of CH4 increased with Clfl-I mole ratio. Increasing Cl/H favored COCl2 and CO formation and inhibited the CO oxidation process. As Cl/H approached 0.44, the concentrations of CH2Cl2 and CH3Cl first increased, and then declined. Reaction temperature greatly affected the reaction system. Increasing temperatures raised the destruction removal efficiency of CH4 and decreased the concentrations of CH3Cl and CH2Cl2. With a certain ratio of Cl/H, the concentrations of CO and COCl2 first increased and then declined. The CO and COCl2 concentration peak was observed around 1100 K and 1023 K, respectively. When the reaction temperature exceeded 1273 K, carbon in CH4 was mostly converted to CO2. It could be concluded that the presence of chlorine enhanced the destruction of CH4, but resulted in the more toxic incomplete combustion products emission such as COCl2 when the reaction temperature was not high enough.

关键词： hazardous waste incineration methane oxidation chlorine

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