Clean air,

uninterrupted power

Refinery case study

Key achievements

 

2.5X
Reduction of ozone levels

99.6%
Dust reduction from inlet to outlet

100%
Availability, saving millions of dollars

1  100 tonnes
CO2 reduction per year to produce 1.7 TWh

Summary

Customer profile

The customer operates seven combined-cycle, gas-fired power plants in Thailand, supplying electricity to the national grid and nearby industrial client.

Original installation

Prior to Camfil’s installation, the site had no filtration system in place, as its closed-loop configuration did not include filtration in the original design.

Site conditions
The facility uses a closed-loop system, meaning external ambient air does not affect the internal environment. However, within this sealed system, partial discharge events were occurring, generating ozone and fine dust particles. These by-products compromised internal air quality and posed risks to equipment performance.
Camfil solution
 Camfil designed and installed a custom stainless steel air filtration system addressing the generators’ ozone and contamination issues. The four-stage filtration design - combined CamClose T6 pre-filters before molecular ozone removal media, and CamClose T6 pre-filters before high-efficiency CamGT 4V-300 T12 filters.
Problem statement
 To prevent equipment failure, the customer was forced to invest heavily in maintaining insulation affected by partial discharge. The ozone produced during these events accelerated corrosion and dust formation inside the generator. As a result, the customer faced millions of dollars in annual maintenance costs, reduced efficiency, and increased operational downtime.
Results
Ozone levels dropped significantly - from a 3-4 ppm average without filtration to just 1.5 ppm with filtration - while dust was reduced by 99.6% from inlet to outlet. The system extended insulator life from one year to six, enhanced reliability, improved operational safety and ultimately saving the customer millions of dollars.

Results

Exhibit A illustrates a four-stage air filtration system recommended for the power generator. The solution includes particulate filtration as well as molecular filtration for removing gases. This solution achieves a range of 99.6% - 100% dust reduction for 0.3µm - 0.5µm particulates, effectively controlling particle levels before the air reaches the generator and ensuring cleaner operation and extended equipment life.

Exhibit B illustrates the reduction in ozone concentration achieved after system implementation. Without filtration, levels reached up to 4ppm. With filtration, levels stabilized to 1.5ppm, demonstrating the system’s ability to maintain consistent air quality and protect critical components from ozone-related degradation.

As a result of this installation, the customer extended their insulator replacement cycle from one year to six years, saving millions of dollars in maintenance costs.

                                                                                     Exhibit B

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