Admat® System (VOC Concentrator)
06 Aug, 2018 / 1464 Views
This system cleans up organic solvents, cleaning solvents, and malodorous gases from painting, printing, semiconductor, electronic parts, precision machinery, and chemicals factories, using adsorbing materials and oxidative decomposition equipment.
Fibrous activated charcoal (C type) or hydrophobic synthetic zeolite (Z type) is used as the adsorbing material.
Awarded the 19th (FY1998) Japan Machinery Federation (JMF) Presidential Prize for Excellence in Energy-saving Machinery.
Awarded the FY1998 Japan Gas Association Prize in Technology.
Admat® system C model (adsorbing material: fibrous activated charcoal)
Structure of Admat® C model
Admat® uses fibrous activated charcoal as its adsorbent.
This is processed into a felt-like sheet which is wrapped around a wire-netting pipe (Figure 2) to form a cassette and which is then attached to a rotor.
Rotating slowly, the rotor continuously induces simultaneous adsorption and desorption.
Adsorption occurs when untreated gas penetrates from the outside of the cassette to the inside, as shown in Figure 3a, and desorption (restoration) is induced by letting hot air at about 130°C flow from the inside to the outside, as shown in Figure 3b.
A change from adsorption to desorption occurs when the cassette arrives in the specified desorption zone at the top of the rotor, as shown in Figure 1.
Desorbed solvents are finally treated and made harmless (for example, deodorized) with post-treatment systems such as Catabrrn® and RTO.
Figure 1. Admat® C model (Concentration unit)
Figure 2. Cassettes
Figure 3a. Adsorption
Figure 3b. Desorption and restoration
Key features of Admat® C
Lower initial & running costs
Admat® uses less activated charcoal and requires a lower initial cost than traditional adsorption system.
Fibrous activated charcoal used as the adsorbent is less expensive because it involves no complex secondary processing, and the replacement cost of the adsorbent is one half to one third of that of traditional system.
Energy & space saving system
Because only the charcoal with a smaller thermal capacity is heated, the entire energy of the hot air for restoration is efficiently used for desorption, thus providing a higher concentration rate. Both the concentration and post-treatment units are compact and lightweight.
Support for small to large volumes of gas
Admat® can support a wide variety of exhaust gas conditions, ranging from low concentration and small volume to large volume.
Increasing or decreasing the number of cassettes can also address a change in gas volume.
Safer operation
Less use of activated charcoal means a smaller amount of adsorbed solvent, allowing for safer operation.
Performance and Industrial Application of Admat®
Admat® delivers varying treatment efficiencies, depending on the type of treated gas and its concentration. Figure 4 shows an example.
A gas with a low concentration is highly concentrated to achieve higher treatment efficiency.
The concentration unit of Admat has an extremely low air resistance, or pressure loss, as shown in Figure 5, contributing to a more compact and lightweight system and requiring less power for air blowing.
Figure 4. Treatment efficiency of exhaust gas
Figure 5. Pressure loss of Admat® (C model)
Adaptive Industrial Sector for Admat® C
Admat® can be effectively used in the industrial sectors listed in the table below.
| Adaptive Factory | Typical Target Process and Purpose | Target Substance |
|---|---|---|
| Paint factory | Exhaust from a paint booth; Improvements in working conditions | Paint thinner |
| Printing factory | Exhaust from a dry kiln, and local exhaust around printers | Thinner for ink |
| Chemical factory | Exhaust from the use of organic solvents and the cleaning process | Organic solvents |
| Food factory | Exhaust from the manufacturing processes; Improvements in working conditions | Alcohol, etc. |
| Semiconductor factory | Exhaust from the cleaning and resist application processes | Organic solvents |
| Electronic parts factory | Exhaust from the cleaning process | Organic solvents |
| Medicinal chemical factory | Exhaust from the production of raw materials | Organic solvents |
| Industrial machinery factory | Exhaust from the painting, bonding, and cleaning processes | Paint thinner |
| Others | Improvements in operation and the factory environment | Solvents |
Configuration of Admat® System
Depending on the source of the gas and if needed, dry filters are used to remove mist or dust from untreated gas.
Then, Admat® (concentration unit) repeats the adsorption and desorption process.
The gas concentrated with Admat® is made harmless by recovering the solvent with the post-treatment equipment or using oxidative decomposition (with direct or catalytic combustion).
With the oxidative decomposition method, the waste heat is used as the heat source for desorption.
System Flow Diagram of Admat® System
