Organic waste gas adsorption desorption catalytic purification devices generally include catalytic combustion method, activated carbon adsorption desorption method, direct combustion method, etc. When the total concentration of waste gas is below 1000g/m3 and the outlet temperature is less than 45 ℃, its properties belong to low concentration waste gas. Therefore, choosing activated carbon adsorption catalytic combustion desorption is more reasonable.

This series of equipment has a complete system design, complete supporting equipment, high purification efficiency, and high degree of automation. It is widely used in industries such as petroleum, chemical, rubber, coating, printing, etc. It can purify benzene waste gas and other organic waste gases. It can purify the environment, eliminate pollution, improve working conditions, ensure the health of workers, and solve secondary pollution.

The system uses a PLC programmable controller to control the equipment. The system has three control methods: automatic, soft manual, and hard manual. In terms of equipment operation, functions such as over temperature alarm for the catalytic chamber, over temperature alarm for the adsorption bed, fan failure alarm, fan undervoltage alarm, and valve failure alarm have been set up. In addition, when detachment stops working, the fan can run for a set time to ensure reliable operation of the equipment. Basically achieve control automation and simplify operation.

The essence of activated carbon adsorption is to use the characteristics of activated carbon adsorption to adsorb organic solvents from low concentration and high air volume exhaust gas into activated carbon and concentrate them. The gas purified by activated carbon adsorption is directly discharged, which is essentially an adsorption concentration process. The organic solvents were not disposed of. It is a physical process.

The essence of catalytic combustion desorption is to use the hot air generated by catalytic combustion to heat the adsorbed organic solvents in activated carbon, bringing them to the boiling point of the solvent, causing the organic solvents to desorb from the activated carbon, and introducing this high concentration exhaust gas into the catalytic combustion reactor. At a catalytic ignition temperature of around 250 ℃, the oxidation reaction is carried out through the action of the catalyst to convert harmless water and carbon dioxide into the atmosphere. It is a chemical reaction process. It is not the combustion of open flames and can solve the secondary pollution during desorption.

Activated carbon adsorption catalytic combustion desorption combines the advantages of both. Firstly, activated carbon is used for adsorption and concentration. When the adsorption of activated carbon reaches saturation, the catalytic combustion equipment is started by electric heating, and the activated carbon adsorption bed is locally heated by hot air. When the catalytic combustion reaction bed is heated to~250 ℃ and the activated carbon adsorption bed locally reaches 60-110 ℃, the high concentration exhaust gas desorbed from the adsorption bed can undergo oxidation reaction in the catalytic reaction bed. The high-temperature gas after the reaction undergoes heat exchange in the heat exchanger, and a portion of the heat exchanged gas is reused and sent to the activated carbon adsorption bed for desorption, while the other portion is discharged into the atmosphere. The temperature of the desorbed exhaust gas rapidly increases after heat exchange in the heat exchanger. This can enable the catalytic combustion device and desorption to operate at low or no power.