The DET Envi-Trap™ DPF is a passively regenerating filter for the stationary gen-set market. It consists of a catalyzed cordierite diesel particulate filter (DPF), is available in 5-60 inch diameters, and is offered in both stainless and carbon steel. The substrate material is coated with a highly active metal oxide wash coat and a specially formulated precious metal catalyst formulation. The substrate material is canned using DET’s patented weld free Modu-Link™ technology. Modu-link™ systems allow for the combination of specific inlet/outlet combinations (side, center, offset) as well as different substrate size options which expedites the application engineering process.
The substrate’s catalyst coating effectively lowers the particulate matter combustion temperature to a level that is closer to that reached during the engines normal duty cycle. Data logging to determine the exhaust temperature profile is very important to proper DPF functionality and is used to ensure proper soot combustion can and will take place. An added benefit for passively regenerating systems like the Envi-Trap™ is that it does not require the use of fuel additives, burners, or additional power sources, and has no moving parts.
The Envi-Trap™ system consists of a catalyzed diesel particulate filter (cDPF) positioned in the exhaust system of a diesel engine. The operating principle for a cDPF is that the exhaust gas enters multiple channels of the ceramic substrate that contains cell plugs at the opposite end. The plugged ends force the gas through the porous walls of the filter trapping more than 90% of the Particulate Matter (PM), Carbon monoxide (CO), and Hydrocarbons (HC) in the exhaust stream. The catalyst formulation transforms the CO and HC into carbon dioxide and water as they pass through the filter walls. The chart at the bottom of the page graphically illustrates the pollutant reduction rates.
The duty cycle requirements for the DET Envi-Trap™ to passively regenerate are as follows:
