Activated carbon adsorption desorption catalytic combustion device

Activated carbon adsorption desorption catalytic combustion device

RCO waste gas treatment composition:

The entire device consists of an electronic control system, pre filter, adsorption bed, catalytic combustion bed, flame retardant, related fans, valves, etc.

Working principle of RCO exhaust gas treatment equipment:

Designed based on the two basic principles of adsorption (high efficiency) and catalytic combustion (energy saving), it adopts dual gas path continuous operation, with one catalytic combustion chamber and two adsorption beds alternately used. Firstly, the organic waste gas is adsorbed onto activated carbon, and when it reaches saturation, the adsorption is stopped. Then, the organic matter is desorbed from the activated carbon using a hot gas flow to regenerate the activated carbon; The detached organic matter has been concentrated (with a concentration several tens of times higher than before) and sent to the catalytic combustion chamber for catalytic combustion into carbon dioxide and water vapor, which are then discharged. When the concentration of organic waste gas reaches 2000mg/m3 or above, 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. After regeneration, it can enter the next adsorption; During desorption, purification can be carried out using another adsorption bed, which is suitable for both continuous and intermittent operations.

Activated carbon adsorption desorption catalytic combustion device

Adsorption process:

Due to the presence of unbalanced and unsaturated molecular gravity or chemical bonding forces on solid surfaces, gas molecules can be attracted and concentrated on the solid surface when it comes into contact with gas. This phenomenon is called adsorption. The use of adsorption method to treat gaseous pollutants is to utilize the properties of solid surfaces, allowing exhaust gas to come into contact with porous solid substances on large surfaces. The pollutants in the exhaust gas are adsorbed on the solid surface, separating them from the gas mixture and achieving purification purposes.

The adsorption process is a reversible process. While the adsorbed components are adsorbed, some of the adsorbed components can detach from the solid surface and return to the gas phase due to molecular thermal motion. This phenomenon is called desorption. When the adsorption rate is equal to the desorption rate, adsorption equilibrium is reached. At adsorption equilibrium, the apparent process of adsorption stops and the adsorbent loses its ability to continue adsorption. When the adsorption process approaches or reaches equilibrium, in order to restore the adsorption capacity of the adsorbent, a certain method needs to be used to release the adsorbed components from the adsorbent, which is called adsorbent regeneration. The adsorption method for treating gaseous pollutants should include the entire process of adsorption and adsorbent regeneration. Adsorption can be divided into physical adsorption and chemical adsorption based on the different forces between gas molecules and solid surface molecules. The former is the result of intermolecular forces, while the latter is the result of the formation of chemical bonds between molecules. Currently, most adsorption treatments use physical adsorption.

Detachment process:

The adsorption bed that has reached saturation state should stop adsorption and enter desorption state through valve switching. The process is as follows: start the desorption fan, open the corresponding valve and far-infrared electric heater, preheat the catalyst inside the catalytic combustion bed, and generate a certain amount of hot air. When the bed temperature reaches the set value, the hot air is sent into the adsorption bed, and the activated carbon is thermally decomposed to extract high concentration organic gases. The activated carbon is introduced into the catalytic combustion bed through the desorption fan and undergoes flameless catalytic combustion at a lower temperature under the action of precious metal catalyst, converting the organic components into non-toxic and harmless CO2 and H2O, At the same time, a large amount of heat is released to maintain the ignition temperature required for catalytic combustion, so that the exhaust gas combustion process does not require additional energy consumption (electricity), and part of the heat is reused for desorption and regeneration of activated carbon in the adsorption bed, greatly reducing energy consumption.

Equipment advantages:

Almost all waste gases containing organic compounds can be treated, and organic waste gases with high air volume and low concentration can be treated. The elasticity of the flow rate for treating organic waste gases is great (nominal flow rate 20%~120%)It can adapt to changes in the composition and concentration of VOCs in organic waste gas, and is insensitive to fluctuations in the presence of small amounts of dust and solid particles in the waste gas. Among all thermal combustion purification methods, the thermal efficiency is extremely high (>95%). Under suitable waste gas concentration conditions, it does not require the addition of auxiliary fuel to achieve high self heating operation purification efficiency (three chambers>99%). It requires less maintenance, safe and reliable operation, and the organic sediment can be periodically cleared. The thermal storage body can be replaced, and the pressure loss of the entire device is small. The device has a long service life.