Chemical plant adsorption catalytic combustion device

Chemical plant adsorption catalytic combustion device

Due to the presence of a certain amount of viscous dust and impurities in organic waste gas, if it is not removed and immediately enters the adsorption equipment, it can easily cause blockage of the microporous plates of the adsorption raw material (honeycomb activated carbon), seriously endangering the actual adsorption effect, improving the friction resistance of the system software, and endangering the actual effect of natural ventilation system software, resulting in safety risks. Therefore, in this process, before the VOC waste gas enters the adsorption bed, an efficient water washing purification tower and a dehydration defogger are set up as pre-treatment devices to effectively remove dust, viscous particles, and other dust impurities in the waste gas, thereby ensuring that the dust and impurities introduced by the original auxiliary fan are effectively intercepted and filtered when entering the fixed adsorption bed.

The use of alkaline washing digestion absorption can efficiently remove fine particles, soluble industrial waste gas, acidic and alkaline vapors, and organic chemical components that can react with alkaline solution from organic waste gas. The alkaline washing tower adopts a two-stage cleaning, two-stage digestion and absorption cleaning, and a layer by layer dehydration and defogging structure, which can efficiently remove harmful components in organic waste gas and provide a normalized treatment of relative cleanliness for event process processing.

In the industrial production process, the organic tail gas emitted enters the rotary valve of the equipment through the induced draft fan, and then the inlet gas and outlet gas are separated by the rotary valve.

The gas is first preheated through the ceramic material filling layer (bottom layer) to generate heat storage and exchange, and its temperature almost reaches the temperature set for catalytic oxidation in the catalytic layer (middle layer). At this point, some pollutants are oxidized and decomposed; The exhaust gas continues to be heated through the heating zone (upper layer, which can be heated by electric heating or natural gas heating) and maintained at the set temperature; It then enters the catalytic layer to complete the catalytic oxidation reaction, which generates CO2 and H2O and releases a large amount of heat to achieve the expected treatment effect.

After catalytic oxidation, the gas enters other ceramic filling layers, recovers heat energy, and is discharged into the atmosphere through a rotary valve. The purified exhaust temperature is only slightly higher than the temperature before exhaust gas treatment. The system operates continuously and switches automatically.

By rotating the valve, all ceramic filling layers complete the cycle of heating, cooling, and purification, and heat is recovered.

The RCO regenerative catalytic combustion device uses rotary valves to replace numerous valves and complex hydraulic equipment in traditional equipment. The organic matter removal rate can reach over 98%, and the heat recovery rate can reach 95-97%.

Chemical plant adsorption catalytic combustion device

Industrial characteristics:

1. The equipment occupies a small area and is lightweight.

2. The adsorption bed adopts a drawer type structure, which is easy to load and replace.

3. When the concentration of organic waste gas reaches over 2000PPm, it can maintain its natural state.

4. Low power consumption, using honeycomb ceramic shaped precious metal catalysts as carriers for catalytic combustion, with low resistance and high activity

5. The device is designed with advanced technology, uses high-quality materials, has stable performance, simple structure, is safe and reliable, energy-saving and labor-saving, and has no secondary pollution.

adsorption process

After removing dust and impurities, the exhaust gas is evenly distributed through the flow cross-section of the activated carbon layer in the fixed adsorption bed through reasonable air distribution. After a certain residence time, physical adsorption (also known as van der Waals adsorption) occurs due to the mutual attraction between the activated carbon surface and organic waste gas molecules.

Its characteristics are: ① the adsorbate (organic waste gas) and adsorbent (activated carbon) do not react with each other, ② the process proceeds quickly, ③ the properties of the adsorbent itself do not change during the adsorption process, ④ the adsorption process is reversible; Thus, the organic components in the exhaust gas are adsorbed on the surface area of activated carbon, thereby purifying the exhaust gas. The purified clean gas is discharged in compliance with standards through fans and chimneys; Each set of equipment is equipped with three adsorption beds, where the exhaust gas passes through two adsorption beds and the other is in the desorption regeneration stage or standby stage, allowing the adsorption process to continue without affecting workshop production.

Desorption - Catalytic Oxidation

Principle of catalytic oxidation reaction:

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.

Types of organic gases that can be processed: benzene, ketones, esters, phenols, aldehydes, alcohols, ethers, hydrocarbons, naphthalene, benzene, and odorous gases.