Technology of Clean Air: New Generator Set Filter/Silencer

Diesel Progress - June 2007
Diesel & Gas Turbine Worldwide - October 2007

CleanAIR Systems has expanded its PERMIT Filter/Silencer product line with the introduction of a new model targeted specifically for diesel prime power and emergency generator sets. With the enforcement of increasing stringent diesel emissions regulations, generator owners also need control technology along with sound attenuation to meet air quality regulations, CleanAIR said. The PERMIT Filter/Silencer incorporates the company's CARB-verified PERMIT Filter, and meets both noise and emissions requirements.

The Santa Fe, NM manufacturer said the new filter/silencer is designed to reduce PM emissons by 85% and carbon monoxide and hydrocarbons by up to 99%. The CleanAIR Filter/Silencer has an all stainless-steel construction and is fully insulated for sound attenuation, the company said.

The concept of the CleanAIR Filter/Silencer combines the benefits of a silencer for sound reduction and the benefits of diesel particulate filters for emissions control into one space-saving unit.

"We designed our PERMIT Filter/Silencer specifically to fit facilities that need to reduce emissions and sound," said CleanAIR Sales Engineer, Daniel Serrano. "By combining our diesel particulate filters with a silencer, the customer no longer needs two separate units that take up a lot of space. Our PERMIT Filter/Silencer does the job of both by eliminating emissions while at the same time providing sound reduction. It also reduces the overall cost."

Available for all stationary engine sizes, the custom-designed PERMI Filter/Silencer is manufactured using 304 stainless steel. Utilizing CleanAIR's integrated approach, the product is designed and manufactured in-house, including: product design; flow, stress and sound modeling; filter catalyzation; and custom fabrication of the silencer shell. Each PERMIT Filter/Silencer is fully insulated to reduce heat loss and provide sound attenuation.

The stainless-steel silencer is corrosion resistant, thereby extending the life of the product. Using stainless steel also reduces the product's total weight by up to 50%, the company said.