1、 Product Introduction of Desorption Catalytic Combustion Device

Activated carbon fiber (or honeycomb activated carbon) adsorption desorption catalytic combustion device is designed based on the basic principles of adsorption and catalytic combustion, and is generally divided into two types: online desorption regeneration and offline desorption regeneration. Online desorption regeneration devices generally adopt dual gas path continuous operation, with one catalytic combustion chamber and two (or three or even more) adsorption beds alternately used. Offline desorption type equipment is generally used in environments with low waste gas treatment capacity and intermittent operation of waste gas emission systems. There is only one adsorption bed, and the main exhaust system stops running during activated carbon desorption regeneration. Based on the characteristics of the on-site customer production site, this case plans to use offline desorption regeneration equipment. The offline desorption regeneration time can generally be completed within 2-4 hours.

The desorption catalytic combustion device first adsorbs organic waste gas with activated carbon fibers, and stops adsorption when it reaches saturation. Then, it uses a hot gas flow to desorb organic matter from the activated carbon fibers and regenerate them; The desorbed organic matter has been concentrated (the amount of desorbed hot gas flow is about 1/10 to 1/15 of the original exhaust gas volume, that is, the concentration of VOCs gas is increased by 10 to 15 times) and sent to the catalytic combustion chamber for catalytic combustion into carbon dioxide and water vapor, which are discharged. When the concentration of organic waste gas exceeds 2000PPm, the organic waste gas can maintain spontaneous combustion in the catalytic bed without external heating. Part of the exhaust gas after combustion is discharged into the atmosphere, while the majority is sent to the adsorption bed for activated carbon regeneration. This can meet the heat energy requirements for combustion and adsorption, achieving the goal of energy conservation. Activated carbon fibers can enter the next adsorption after regeneration. Offline desorption type equipment requires the main ventilation system to be turned off during desorption, but the desorption time can be manually controlled and adjusted to select non production time periods. Simply manually activate the desorption start button and set the desorption time to automatically complete desorption regeneration. The desorption regeneration process, which involves heating, desorption, and cooling of the adsorption bed, can be completed within 2-4 hours without significantly affecting production operations.

2、 Technical characteristics of desorption catalytic combustion device

The desorption catalytic combustion device has the following advantages:

1. High purification efficiency: Activated carbon fiber has excellent adsorption effect on organic waste gas, fully meeting the new environmental protection requirements of the country and Tianjin city.

2. Adopting the desorption regeneration process, the service life of activated carbon fibers is long, up to 3-5 years, which can effectively reduce the secondary pollution and treatment costs caused by the saturation of adsorption filter materials.

3. Adopting catalytic combustion treatment process, precious metals such as platinum and palladium are selected as catalysts to greatly reduce the combustion oxidation decomposition temperature. The oxidation decomposition combustion temperature can be controlled between 300-350 ℃. The nitrogen element is directly oxidized to generate nitrogen gas, producing less nitrogen oxides and not causing secondary environmental pollution.

4. The equipment design principle is advanced, the materials are unique, the performance is stable, the structure is simple, safe and reliable, energy-saving and labor-saving, the investment is low, the equipment occupies a small area, and there is no secondary pollution.

5. The catalytic combustion chamber adopts precious metal catalysts with honeycomb ceramic like carriers, which have low resistance and high activity. When the concentration of organic vapor reaches over 2000PPm, spontaneous combustion can be maintained.

6. Low power consumption, due to the low resistance of the bed layer, a fan with lower air pressure can work, which not only consumes less power but also has low noise. During catalytic combustion, electric heating is required to start. After the catalytic combustion of organic matter in the catalytic bed begins, its combustion heat can be sufficient to maintain the temperature required for its reaction. At this point, electric heating stops, and the general start-up time for electric heating is about 0.5-1 hour.

7. The system has a high degree of automation and is safe and reliable. In terms of safe operation, alarm functions such as catalyst chamber over temperature alarm, adsorption bed over temperature alarm, fan failure, and valve failure have been set up. When desorption stops, the fan can operate with a delay to ensure equipment safety and reliable operation.