Catalytic combustion technology

Catalytic combustion technology

1 Technical Background

The economic and social development and the demand for industrialization make catalytic technology, especially catalytic combustion technology, increasingly become an indispensable industrial technology means, and with the improvement of people's living standards and the growth of demand, the catalytic industry will continue to enter thousands of households, into people's lives. The study of catalytic combustion started from the discovery of the catalytic effect of platinum on methane combustion. Catalytic combustion plays a very important role in improving the combustion process, reducing the reaction temperature, promoting complete combustion, and inhibiting the formation of toxic and harmful substances, and has been widely used in many aspects of industrial production and daily life.

2. The essence and advantages of catalytic combustion

Catalytic combustion is a typical gas-solid phase catalytic reaction, it reduces the activation energy of the reaction with the help of the catalyst, so that it is flameless combustion at a low ignition temperature of 200 ~ 300℃. The oxidation of organic matter occurs on the surface of the solid catalyst, while producing CO2 and H2O, and releasing a lot of heat, because of its low oxidation reaction temperature. Therefore, N2 in the air is greatly inhibited to form high temperature NOx. Moreover, due to the selective catalysis of the catalyst, it is possible to limit the oxidation process of nitrogen-containing compounds (RNH) in the fuel, so that most of them form molecular nitrogen (N2).

Compared with traditional flame combustion, catalytic combustion has great advantages:

(1) The ignition temperature is low, the energy consumption is low, the combustion is easy to be stable, and even the oxidation reaction can be completed without external heat transfer after the ignition temperature.

(2) High purification efficiency, low emission level of pollutants (such as NOx and incomplete combustion products, etc.).

(3) Large oxygen concentration range, low noise, no secondary pollution, moderate combustion, low operating costs, and convenient operation management

3 Technology Application

The production process of petrochemical, paint, electroplating, printing, coating, tire manufacturing and other industries all involve the use and emission of organic volatile compounds. The harmful volatile organic compounds are usually hydrocarbon compounds, oxygen-containing organic compounds, chlorine, sulfur, phosphorus and halogen organic compounds. If these volatile organic compounds are discharged directly into the atmosphere without treatment, they will cause serious environmental pollution. Traditional organic waste gas purification treatment methods (such as adsorption, condensation, direct combustion, etc.) have defects, such as easy to cause secondary pollution. In order to overcome the defects of traditional organic waste gas treatment methods, catalytic combustion method is used to purify organic waste gas.

Catalytic combustion method is a practical and simple organic waste gas purification technology, the technology is the deep oxidation of organic molecules on the surface of the catalyst into harmless carbon dioxide and water method, also known as catalytic complete oxidation or catalytic deep oxidation method.The invention relates to a catalytic combustion technology for industrial benzene waste gas, which uses a low-cost non-precious metal catalyst, which is basically composed of CuO, MnO2, Cu-manganese spinel, ZrO2, CeO2, zirconium and cerium solid solution, which can greatly reduce the reaction temperature of catalytic combustion, improve the catalytic activity, and greatly extend the life of the catalyst.The invention relates to a catalytic combustion catalyst, which is a catalytic combustion catalyst for the purification treatment of organic waste gas, and consists of a blocky honeycomb ceramic carrier skeleton, a coating on it and a noble metal active component.The coating of the catalyst is composed of a composite oxide formed by Al2O3, SiO2 and one or several alkaline earth metal oxides, so it has good high temperature resistance. The active components of precious metals are loaded by impregnation method, and the effective utilization rate is high.