Study On Catalytic Combustion Process And Thermal Performance Of Volatile Organic Compounds

Volatile organic compounds?VOCs? are not only extremely toxic to human health but also greatly harmful to the atmospheric environment. This article studies the treatment of volatile organic compounds from the aspects of environmental protection and energy efficiency. Firstly, the catalytic combustion technology was studied to deal with the VOCs gas because of its efficiency, low temperature and no secondary pollution. And then the thermal performance of the catalytic combustion process was analyzed, coupling technology of the regenerative combustion and catalytic combustion technology was proposed to increase the energy utilization rate.The single-component catalyst MnO/?-Al₂O₃, two-component catalyst Cu MnO/?-Al₂O₃ and multi-component catalyst CuMnOx-CeO₂/?-Al₂O₃ were prepared with impregnation method. Also, their activity in catalyzing the benzene, toluene and xylene were observed. The results indicated that CuMnOx-CeO₂/ ?-Al₂O₃ was most effective, the conversion rate of benzene, toluene and xylene were 97.27%, 98.30% and 98.07% at the temperature of 300?, space velocity is 10000h-1 and the reactant's mass concentration is 105 mg/m³. Such conditions are equivalent to the actual production condition, so the CuMnOx-CeO₂/?-Al₂O₃ can be applied in industrial production.The research and exploration on the preparing process of catalyst, isothermal region and the influence on the catalytic activity by catalyst loading were carried out. This article also studied the mechanisms for catalytic combustion. CeO₂ has high oxygen storage capacity and oxygen mobility. Moreover, MnOx has high regeneration oxygen capacity, and catalytic oxidation ability of CuO is stronger. A catalyst consisting of these three components has high catalytic activity.In this paper, the phenomenon of runaway in the process of catalytic combustion is analyzed, and the scientificalness of this phenomenon is proved by theoretical calculation, it provided theoretical evidence for recycling energy of the this part. This article mensurated thermal parameters such as thermal conductivity and specific heat of the catalyst. Test results showed that the thermal conductivity of the three catalysts was small, the thermal conductivity of Mno/?-Al₂O₃ is 0.09497 w/?m·k?, CuMnOx-CeO₂/?-Al₂O₃ is 0.09130 w/?m·k?, and the thermal conductivity of CuMnOx-CeO₂/?-Al₂O₃ is 0.10500 w/?m·k?. In order to avoid the catalyst deactivation caused by high temperature, we diluted the catalyst with the double SiO₂, it can also avoid the gas circuit short circuited.Finally, thermo stability of the catalyst was analyzed in this paper. We proposed the new technology coupling of the regenerative combustion and catalytic combustion. Calculation results showed that we can save 0.4317 million a year in energy consumption costs when the pollutant concentration was 105 mg/m³, the gas flow was 104 m³/ h, and the space velocity was 10000h-1. This new technology bears a huge energy conservation potential and relatively great prospect of popularization.