Catalytic Combustion Equipment

Catalytic combustion is a purification method that uses a catalyst to oxidize and decompose combustible substances in waste gases at lower temperatures. Therefore, catalytic combustion is also known as catalytic chemical conversion. As the catalyst accelerates the process of oxidation and decomposition, most hydrocarbons can be fully oxidized at temperatures between 300~450°C with the help of a catalyst. Little auxiliary fuel is needed for catalytic combustion, with low energy consumption and compact equipment size. However, issues such as catalyst poisoning, replacement and cleaning of the catalyst bed, and high costs, affect the promotion and application of this method in industrial production processes. In the process of chemical reactions, a method called catalytic combustion is used to lower the combustion temperature and accelerate the complete oxidation of toxic and harmful gases by utilizing catalysts. Since the carrier of the catalyst is made from porous materials, it has a large specific surface area and appropriate pore size. When organic gases heated to 300~450℃ pass through the catalytic layer, oxygen and organic gases are adsorbed on the catalyst at the surface of the porous material, increasing the opportunities for contact and collision between oxygen and organic gases, enhancing the activity, and causing a vigorous chemical reaction between the organic gases and oxygen to produce CO2 and H2O. Simultaneously, heat is generated, converting the organic gases into non-toxic and harmless gases. When designing catalytic combustion equipment, the following aspects should be considered: 1. Uniform airflow and temperature distribution are required. To ensure uniform distribution of airflow and temperature across the catalyst surface and to prevent the flame from directly contacting the catalyst, the combustion chamber must have sufficient length and space. The catalytic combustion unit should have good insulation properties. The furnace body is generally lined with refractory materials inside a steel structure shell, or constructed with a double-walled sandwich structure. 2. Easy to clean and replace. Catalyst reactors should generally be designed with a modular drawer structure for easy handling, making it convenient to clean and replace the catalyst carrier. 3. Auxiliary Fuel and Combustion Aid. Catalytic combustion typically uses natural gas as auxiliary fuel, but other options include fuel oil, electric heating, etc. Combustion aid is generally provided by purified gas; if the purified gas is not suitable for combustion aid, air should be introduced. 4. High conversion rate. As catalytic combustion is an irreversible exothermic reaction, it should be carried out at the highest possible temperature at any stage of the reaction to achieve a high conversion rate. However, the operating temperature is often limited by certain conditions, such as the heat resistance of the catalyst, the availability of high-temperature materials, the supply of thermal energy, and the presence of side reactions. Therefore, in actual production, appropriate choices should be made based on the specific circumstances.