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Any emissions arising from industrial production processes are can find pollution components such as dust, VOC and other pollutants.

Treatment methods to remove pollutants and odors from exhaust streams have been developed.

But, effective exhaust gas treatment is always a difficult problem that researchers seek to overcome.

Until the technology of using buffering materials in exhaust gas treatment was born, significantly increasing the efficiency of exhaust gas treatment.

What is the buffer material in exhaust gas treatment?

Buffer material is the main component that makes up the buffer layer used in the absorption tower.

The backing is either a cushioning material such as a Raschig ring or else it can be a specially designed structural material. The buffer material can also be catalyst particles orzeolite pellets, activated carbon granular,…

Operating principle of absorption tower using buffer material

The exhaust gas flow enters the exhaust gas treatment tower from the bottom up. Absorbent solution of polluted gases is distributed through the rain frame from top to bottom. The solution stream is divided into small molecules evenly distributed through the buffer layer.

The absorption reaction occurs on the wet surface of the cushion material. The thickness of the cushioning material layer has been calculated with a long enough exposure time. Let the chemical solution completely react with polluted gases in the exhaust stream.

After the reaction time, theclean air flow will go back up through another layer of air filter to the outside. The pollutants are absorbed along with the solution that pours downward according to liquid gravity and is collected into the treatment tank.

Treatment efficiency depends on the air flow velocity in the buffer material layer and the total surface area in contact with the buffer material layer.

buffering material in exhaust gas treatment

Illustration of buffer material in the absorption tower

Structural layer of buffer material in exhaust gas treatment

The bedding material is filled with randomly placed bedding material (random bedding ). Or with padding materials arranged or stacked on top of each other ( stacked padding). Shape, surface area and porosity of the cushion material. These are factors that affect processing performance.

Types of cushioning materials

Cushion materials on the market come in sizes from 3mm to about 75mm, porosity (about 65-95%). It is a good sealing material because it allows a large amount of fluid to come into contact with the exhaust gases as it passes through the sealing layer. In addition, the high porosity of the buffer materials will reduce the resistance to the absorption process.

There are three types of cushioning materials:

  • Ceramics: high humidity, corrosion resistance at high temperatures, poor durability.
  • Metal: outstanding durability but heavy weight and high cost.
  • Plastic: good durability, but poor wettability at low liquid levels, cheap.

Types of objects padding
Types of cushioning materials

Raschig ceramic rings and saddle rings are used infrequently. Because they are old cushion materials, the cost is relatively low and the treatment efficiency is not high.

Pall rings are made of plastic or metal and have a clearance of 90% to 96%. This cushioning material was much more effective and is still used today.

The latest Intalox padding material tab is a combination of a saddle ring and a Pall ring.


HASY ENVIRONMENT provides technical services, complete design of exhaust gas treatment systems using buffer materials. HASY ENVIRONMENT is ready to assist and guide customers in operating the treatment system. We will rely on customer requirements to determine appropriate treatment system design parameters. For detailed advice on using cushioning materials in exhaust gas treatment, please contact us immediately at 0972221608 or website