Activated Carbon Fiber Adsorption Tunnel Oven

The Activated Carbon Fiber Adsorption Tunnel Oven is a modern integrated environmentally friendly industrial drying system that combines continuous material drying/thermal treatment with efficient purification of organic waste gases (VOCs).Based on the traditional tunnel oven (continuous conveyor drying system), this equipment integrates an activated carbon fiber (ACF) adsorption, recovery, and purification unit directly into the exhaust outlet or circulating air duct. It enables simultaneous operation of workpiece drying and VOC purification, achieving both production efficiency and environmental protection.

Core Applications

The equipment is mainly used in industrial continuous production processes where medium-to-low concentration, high-value, and volatile organic compounds (VOCs) are generated during drying.

Electronics and Semiconductor Industry

Used for:

PCB curing

Electronic component adhesive drying

Chip packaging insulation paint baking

Surface Coating and Printing Industry

Used for:

Drying of sprayed coatings on metal and plastic parts

Screen printing ink drying

Gravure printing production lines

New Materials and Composite Materials Industry

Used for:

Carbon fiber felt drying

Aerogel drying processes

Fiber fabric coating curing

Pharmaceutical and Chemical Industry

Used for:

Pharmaceutical granule drying

Continuous evaporation and recovery of solvent-based coatings or adhesives

Applicable Technical and Industry Standards

The design, manufacturing, and emission control of this equipment must comply with relevant national environmental protection and machinery manufacturing standards.

HJ 2026

Technical Specifications for Industrial Organic Waste Gas Treatment Engineering by Adsorption Method

Regulates:

Adsorption airflow velocity

Pressure loss requirements (generally less than 4 kPa)

Regeneration temperature control

GB 37822

Standard for Control of Volatile Organic Compound Emissions

Used to control fugitive VOC emissions from the inlet and outlet openings of tunnel ovens.

GB 9078

Emission Standard of Air Pollutants for Industrial Kilns and Furnaces

Controls emission requirements from heating chambers and exhaust outlets.

Environmental Protection Technical Requirements

The activated carbon fiber used generally requires:

Specific surface area ≥ 1100 m²/g (BET method)

to ensure high adsorption efficiency.

Main Equipment Features

High-Efficiency Adsorption and Low Pressure Loss

Activated carbon fiber (ACF) has micropores directly exposed on the fiber surface, providing adsorption and desorption speeds dozens of times faster than traditional granular activated carbon (GAC).

Advantages include:

Faster adsorption/desorption response

Higher purification efficiency

Lower adsorption layer pressure loss (normally below 4 kPa)

Highly Integrated Design with Small Footprint

The purification system is integrated with the tunnel production line, eliminating the need for large independent environmental treatment equipment and long-distance exhaust pipelines.

Dual Recovery of Heat Energy and Valuable Resources

High-concentration VOCs after desorption can be recovered through condensation systems for valuable solvent recycling, such as:

Dichloromethane

Cyclohexane

Meanwhile, hot air can be recycled to significantly reduce energy consumption.

Continuous Conveyor Production

Compatible with:

Conveyor belts

Hanging chain systems

to meet requirements for large-scale, standardized, automated industrial production.

High Safety Design

Equipped with:

Precise temperature control systems

Gas concentration monitoring

Safety interlock systems

During hot air regeneration, the temperature is strictly controlled below 120°C to ensure safe operation.

FAQ

Q1: What are the advantages of activated carbon fiber (ACF) compared with traditional granular activated carbon (GAC)?

A: Activated carbon fiber has a larger specific surface area, higher adsorption capacity, faster adsorption speed, and lower airflow resistance. It improves exhaust treatment efficiency in tunnel ovens, enables more complete regeneration, provides longer service life, and reduces the risk of airflow blockage.

Q2: How does the equipment prevent fire or explosion during operation?

A: The system is equipped with online VOC concentration monitoring. When VOC concentration approaches the lower explosive limit (LEL), the system automatically introduces fresh air for dilution.

During thermal regeneration:

Regeneration temperature is strictly controlled below 120°C

Hot air regeneration is prohibited when flammable gases such as ketones are present

These measures ensure safe operation.

Q3: How is saturated activated carbon fiber regenerated?

A: The equipment is usually equipped with a multi-chamber switching system.

When one adsorption chamber becomes saturated:

The system automatically switches to another adsorption chamber.

The saturated chamber is regenerated using low-pressure steam or hot air below 120°C.

The desorbed solvents are recovered through a condenser system.

This allows repeated use of the activated carbon fiber.

Q4: How often does activated carbon fiber felt need to be replaced?

A: The replacement cycle depends on:

VOC concentration

Operating frequency

Maintenance conditions

With proper maintenance, including pre-filtration for dust and oil removal and regular regeneration, replacement is generally required when the dynamic adsorption capacity of ACF decreases to approximately 80% of the designed value.

The typical service life is about 1–2 years.

Q5: Are there any restrictions on the incoming waste gas conditions?

A: Yes. The waste gas should not contain:

High concentrations of dust

Paint mist

High-boiling polymerizable sticky substances

These substances may cover the fiber surface and cause adsorption failure ("poisoning" of the activated carbon fiber).

If such contaminants cannot be avoided, a high-efficiency pretreatment filtration system must be installed before the tunnel oven exhaust outlet to protect the ACF adsorption unit.