Camfil four-stage filtration system ensures clean air and uninterrupted operation at a gas-fired power plant in Thailand

2026-04-303 min.

In seven gas-fired generating units at a power plant in Thailand, the leading clean air solutions provider Camfil implemented a specially designed four-stage filtration system that eliminates ozone and fine particulate matter accumulating in closed generator systems. The solution significantly reduces corrosion, extends the life of insulation materials and ensures stable, uninterrupted operation of the equipment.

The gas generators described in the project operate in a closed-loop system, meaning that the internal air is not exchanged with the external environment. Nevertheless, ozone and fine particulate matter accumulate within the system, generated by partial electrical discharges. Ozone is a highly reactive gas that attacks insulation materials, accelerating their aging, while fine particles cause deposits and additional efficiency losses. Prior to Camfil’s intervention, there was no filtration in place at the power plant, resulting in frequent failures, high maintenance costs, and significant risks of unplanned downtime. To identify a sustainable solution, Camfil carried out a detailed on-site analysis.

Following the assessment, the company designed and installed a four-stage filtration system with components made entirely of stainless steel. The first stage consists of CamClose T6 filters, ensuring stable pressure and effective capture of coarse and medium particles. This is followed by a layer of Camfil molecular filters, specifically selected for ozone adsorption. The third filtration stage again uses CamClose T6 filters for additional purification and airflow stabilization.

“The final stage of the filtration process is handled by high-efficiency EPA filters CamGT 4V-300 T12, which capture the finest particles and ensure the level of air cleanliness required for reliable generator operation. This combination allows the system to maintain low pressure drop, high efficiency, and stable performance even under harsh conditions,” Camfil commented.

Following the system implementation, ozone concentration decreased from 3–4 ppm to approximately 1.5 ppm, significantly reducing the aging rate of insulation materials. Dust contamination was reduced by over 99%, preventing deposits and improving the performance of the generator units.