VOC catalytic combustion includes preheating, catalytic reaction and heat recovery. The temperature of VOC waste gas discharged from industry is usually low, so it needs to be preheated before entering the catalytic reaction bed, usually using heat exchanger. For the VOC exhaust gas with low concentration and low temperature, the combustion process can not maintain its own heat balance, so it needs to consume auxiliary fuel. The preheated VOC waste gas enters the catalytic reaction bed, and the flameless combustion occurs on the surface of the catalyst, which is completely oxidized and releases a large amount of heat energy. The purified gas stream has a high temperature, and the heat exchanger is used to recover energy for preheating VOC exhaust gas, so as to reduce the consumption of auxiliary fuel and avoid heat pollution to the environment. The engineering application of VOCs exhaust gas catalytic combustion process at home and abroad mainly includes regenerative catalytic combustion, heat recovery catalytic combustion, direct combustion catalytic combustion, adsorption concentration catalytic combustion. The catalytic combustion of constant dust removal production is adsorption concentration catalytic combustion.
Characteristics of catalytic combustion
1) Low ignition temperature, fast reaction rate and energy saving. In the process of catalytic combustion, the catalyst can reduce the activation energy of the reaction between VOC and oxygen and change the reaction pathway. The low starting temperature of catalytic combustion saves the consumption of auxiliary energy, and in some cases, it does not even need external heating.
2) High treatment efficiency, less secondary pollutants and greenhouse gas emissions. The purification rate of VOCs waste gas by catalytic combustion is usually more than 95%, and the final products are mainly CO2 and H2O
3) It has a wide range of applications. Catalytic combustion can treat almost all hydrocarbon organic waste gas and odor gas. For VOCs waste gas with low concentration, large flow, multi-component and no recovery value, it is economical and reasonable to use catalytic combustion method.
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