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I. Product Overview
The activated carbon adsorption tank is specialized environmental protection equipment designed to purify VOCs (Volatile Organic Compounds) and odorous gases using the principle of fixed-bed adsorption with granular activated carbon. The equipment utilizes the surface forces of high-performance activated carbon adsorbents to capture organic waste gas molecules, thereby separating them from the gas mixture and achieving purification. These tanks are widely used for VOC control and oil/gas recovery in sectors such as gas stations, oil depots, refineries, chemical plants, painting workshops, and pharmaceutical factories.
Product Standards: "Technical Conditions for Activated Carbon Adsorption Tanks" (JB/T 10193) and "Technical Standard for Vapor Recovery and Treatment Facilities" (GB/T 50759-2022).
II. Working Principle
Activated carbon possesses a massive specific surface area (exceeding 1000 m²/g) and a rich microporous structure. It adsorbs organic substances from the waste gas onto its surface via intermolecular forces, allowing clean gas to be discharged in compliance with standards.
- A typical activated carbon adsorption tank system features a dual-tank alternating design: while Tank A performs adsorption, Tank B undergoes desorption and regeneration. Automatic switching enables continuous, 24-hour operation.
- Adsorption Stage: Pre-treated waste gas enters the adsorption tank; VOC molecules are adsorbed by the activated carbon, and the purified gas is discharged in compliance with standards.
- Desorption and Regeneration Stage (Optional): Once the activated carbon reaches adsorption saturation, the concentrated oil/gas can be transferred via vacuum desorption to an upstream condensation/liquefaction unit; alternatively, steam desorption can be used to vaporize and recover the adsorbed organic solvents.
III. Technical Parameters
|
Parameter Item |
Technical Specifications |
|
Vessel Diameter |
200–4000 mm (customizable) |
|
Operating Pressure |
Atmospheric pressure to 0.6 MPa |
|
VOC Removal Rate |
≥90%–95% |
|
Activated Carbon Type |
Granular / Honeycomb / Coconut shell |
|
Material |
Carbon steel / Stainless steel (304/316) / PP |
|
Operating Temperature |
-10°C to 60°C |
|
Operating Humidity |
≤80% RH (dehumidification module required for high humidity) |
|
Initial Pressure Drop |
≤200 Pa |
IV. Applicable Media and Scenarios
Types of VOCs handled: Organic solvent vapors such as benzenes, ketones, alcohols, esters, alkanes, and gasoline vapors.
Key application scenarios:
- Stage III vapor recovery at gas stations
- Vapor emission control for oil depots and tank farms
- Vapor recovery at loading racks in refining and petrochemical enterprises
- Organic waste gas treatment for chemical and pharmaceutical plants
- Waste gas purification in industries such as spray painting, printing, rubber, and plastics manufacturing
V. Product Advantages
- High purification efficiency: VOC removal rate reaches 90%–95% or higher
- Broad applicability: Capable of treating mixed organic waste gas streams
- Easy maintenance: Simple structure; activated carbon replacement is straightforward
- Stable operation: Operates at low temperature and atmospheric pressure; safe and reliable
VI. Model Selection and Precautions
Key factors for model selection:
Waste gas composition, concentration, and airflow rate
Emission standard requirements
Site conditions and investment budget
Important notes:
Inlet waste gas should be free of solid particulates and liquid oil droplets to prevent clogging of activated carbon pores
Dehumidification modules are required for high-humidity environments
Activated carbon must be replaced promptly upon saturation; spent activated carbon is classified as hazardous waste (Category HW49) and requires compliant disposal
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