Activated Carbon Catalytic Combustion Equipment

Basic principle of activated carbon catalytic combustion equipment:

Activated carbon catalytic combustion equipment technology is an integrated technology that combines adsorption and catalytic combustion. It converts high air volume and low concentration exhaust gas into low air volume exhaust gas through adsorption/desorption processes, and then purifies it through catalytic combustion.

Composition of Activated Carbon Catalytic Combustion Equipment System: The catalytic decomposition device consists of a pretreatment device, a preheating device, a catalytic combustion device, and a performance stabilization device.

Exhaust gas pretreatment: In order to avoid clogging of the catalyst bed and catalyst poisoning, exhaust gas needs to be pretreated before entering the bed to remove dust, droplets, and catalyst toxins from the exhaust gas.

Preheating device: The preheating device includes an exhaust gas preheating device and a catalyst burner preheating device. Because the catalyst has a catalytic activity temperature, it is called the catalyst ignition temperature for catalytic combustion. It is necessary to make the temperature of the exhaust gas and bed reach the ignition temperature before catalytic combustion can proceed. Therefore, a preheating device needs to be set up. But for situations where the exhaust gas itself has a high temperature, such as enameled wires, insulation materials, baking paint, etc., and the temperature can reach over 300 ℃, there is no need to install a preheating device.

Catalytic combustion device: Generally, a fixed bed catalytic reactor is used, and the reactor design is carried out according to specifications. It should be easy to operate, maintain, and load/unload catalysts.

Performance stabilization device: It is installed on the top of the main unit to ensure stable pressure relief performance of the diaphragm. In case of accidents during equipment operation, it can be promptly cracked to relieve pressure and prevent accidents from occurring.

Catalytic combustion is a purification method that uses catalysts to oxidize and decompose combustible substances in exhaust gas at lower temperatures. So, catalytic combustion is also known as catalytic chemical conversion. Due to the acceleration of the oxidation decomposition process by the catalyst, most hydrocarbons can be completely oxidized by the catalyst at temperatures of 300-500 ℃.

The catalyst first adsorbs VOC molecules, increasing the concentration of reactants. Secondly, the catalytic oxidation stage reduces the activation energy of the reaction, increasing the reaction rate. With the help of the catalyst, the exhaust gas can undergo anaerobic combustion at a lower ignition temperature, decomposing into CO2 and H2O, releasing a large amount of heat with low energy consumption. In some cases, external heating is not required after reaching the ignition temperature, and the reaction temperature is between 250-400 ℃.

The method of using catalysts to reduce combustion temperature and accelerate the complete oxidation of stable gases during chemical reactions is called catalytic combustion.

Due to the fact that the catalyst carrier is made of porous material with a large specific surface area and suitable pore size, when gas heated to 300-450 ℃ passes through the catalytic layer, oxygen and gas are adsorbed on the catalyst on the surface of the porous material, increasing the chance of contact and collision between oxygen and gas, improving activity, and causing a violent chemical reaction between gas and oxygen to generate CO2 and H2O, while generating heat, thereby making the gas a stable gas for toxin detection performance.