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How do activated carbon adsorption tanks recover organic solvents? An explanation of the adsorption and desorption process.

Industrial Exhaust Gas Treatment Equipment

1793083812000

How do activated carbon adsorption tanks recover organic solvents? An explanation of the adsorption and desorption process.

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Activated carbon adsorption tanks capture organic components from waste gas by passing the gas through a bed of granular activated carbon. During the adsorption phase, the organic-laden waste gas enters the tank and flows through the carbon bed, where the organic compounds are trapped within the micropores of the activated carbon; the treated gas is then discharged through the outlet. Once the activated carbon reaches a predetermined adsorption cycle limit or nears saturation, the system switches—via a valve mechanism—to the desorption phase. During this stage, steam or heated nitrogen is introduced to desorb the organic solvents from the activated carbon, which are subsequently recovered using auxiliary equipment such as condensers and separators. Following desorption, the tank is cooled before returning to the adsorption mode. In multi-tank configurations, the adsorption and desorption processes can be seamlessly integrated through alternating operation. The specific method for solvent recovery, the duration of the cycles, and the overall efficiency are determined based on the properties of the solvents, the concentration of the waste gas, and the specific system configuration.

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What is the difference between an activated carbon adsorption tank and an activated carbon adsorption box?

Adsorption tanks feature a vertical vessel design equipped with valves and piping, making them suitable for closed-loop processes, desorption/regeneration, and solvent recovery systems. Adsorption units, by contrast, utilize a modular, drawer-style configuration and are typically employed in purification processes that require periodic replacement of the activated carbon. The selection between these options should be based on an assessment of factors such as airflow volume, exhaust gas concentration, the need for solvent recovery, and the specific operational requirements.

What are the materials and specifications for activated carbon adsorption tanks?

Available material options include anti-corrosion treated carbon steel, 304 stainless steel, or 316L stainless steel. The VCA-G1000, VCA-G3000, and VCA-G5000 models listed have air treatment capacities of 1,000, 3,000, and 5,000 m³/h, respectively. Specific vessel dimensions, materials, and pressure parameters are determined based on the model and project requirements.

What is the applicable temperature range for an activated carbon adsorption tank?

The product specifications indicate an exhaust gas temperature of ≤80°C. Actual operating conditions must be determined by taking into account the composition of the exhaust gas, the characteristics of the activated carbon, and the specific adsorption and desorption processes.

Can an activated carbon adsorption tank operate continuously?

Continuous operation can be achieved by switching between multiple vessels, allowing for adsorption and desorption processes to take place across different units. Whether the system can meet a 24-hour operational requirement must be verified during the design phase, based on factors such as the exhaust gas flow rate, adsorption cycle duration, desorption and cooling times, and the specific configuration of the vessels.

How is solvent recovery achieved using an activated carbon adsorption tank?

As organic waste gas passes through a bed of granular activated carbon within a vessel, the organic components are adsorbed. Once the activated carbon becomes saturated, it can be regenerated by introducing steam or hot nitrogen; the desorbed solvents are then recovered using auxiliary equipment such as condensers. The specific regeneration method and recovery efficiency depend on the properties of the solvents and the design of the system.

What kind of waste gas are activated carbon adsorption tanks primarily used to treat?

Primarily used for the treatment of organic waste gas with low to medium flow rates; it is particularly well-suited for applications involving the recovery of organic solvents or processes where the adsorbent can be desorbed and regenerated. It is applicable for concentrations ranging from 200 to 20,000 mg/m³; however, its actual suitability should be determined based on the specific composition of the waste gas and the process conditions.

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