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Activated carbon adsorption and desorption + Regenerative Catalytic Oxidizer (RCO)

Process flow chart:

 

Process description:

(1)Pretreatment stage

The pretreatment is performed in a packed scrubbing column, where the alkaline or acid waste gases are neutralized and pre-treated by the corresponding solutions sprayed, or pre-filtered by the dry filter to remove the dust.

 

(2)Activated carbon adsorption stage

After the pretreatment, the waste gas is fed into the subsequent activated carbon adsorption/desorption column, where the VOCs are adsorbed by the micro-pores on the surface of the activated carbon. In this way, the VOCs are removed, and the air is purified.

 

(3)Activated carbon desorption stage

When the adsorbent bed is saturated, the desorption air valve and the adsorption air valve are switched to start the desorption fan, which can desorb VOCs on the adsorbent bed. The fresh air used for desorption is first fed into and heated up in the heat exchanger at the fresh air inlet and electric heating chamber. The fresh air heated to about 120 ℃ flows into the activated carbon bed, which is heated and release the VOCs adsorbed.

 

(4)Catalytic combustion stage

The VOCs are fed into the heat exchanger before the catalytic oxidizer by the fan, and then the preheater in the catalytic oxidizer. Heated by the electric heater, the temperature of the gas is raised to about 250-300 ℃, and it then flows into the catalytic oxidizer , where the organic matters are oxidized flamelessly under the action of the catalyst, and decomposed into CO2 and H2O, while generating a large amount of heat. The temperature of the gas is further increased. The high-temperature gas is introduced into the heat exchanger to preheat the untreated VOCs, hence part of the heat is recovered. The gas leaving the heat exchanger then goes to the heat exchanger at the fresh air inlet, where it heats the fresh air and then is discharged through the chimney.

Technical features:

Automatically controlled with PLC and equipped with touch screen, it features outstanding human-machine interaction and energy saving;

Capable of flameless oxidation, it is safe, efficient and explosion-proof;

The high performance precious metal catalyst in ceramic honeycomb carrier has high catalytic activity, stable performance, long service life and low resistance;

Its high performance activated carbon adsorbent has a large specific surface area, which brings about high adsorption and desorption performance, low wind resistance and is quite applicable to adsorption and desorption at high flow rate;

Depending on the customer’s requirements and waste gases, the adsorbent bed can be equipped with fire protection system to fully guarantee the safety of equipment;

The activated carbon adsorption column and catalytic oxidizer are equipped with the explosion vent diaphragm, which is punctured when the internal pressure increases abnormally, so as to prevent major accidents due to excessive pressure in the adsorption column and catalytic oxidizer;

Equipped with the LEL interlocking protection system, the VOC concentration in the system is strictly controlled below 1/4 lower explosion limit;

The system is fail-proof equipped with multiple safety protection systems, such as non-steady state control, high temperature alarm, shutdown alarm and emergency response measures.

Organic chemicals, pharmaceutics, coating, surface coating, oil, packaging and printing, and other industries involving organic solvents.

 

Applications:

Organic chemicals, pharmaceutics, coating, surface coating, oil, packaging and printing, and other industries involving organic solvents.

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