Liqtech manufactures silicon carbide Diesel Particulate Filters (DPFs) using vapor phase sintering to create filters that have high soot load capacity of between 10 and 18 grams of soot per liter and filters that can resist temperatures higher than 1100 degrees C. Liqtech filters are used in catalyzed passive, electric, and burner emission systems target at Tier III applications requiring greater than 85% PM reduction.
The parent company Liqtech A/S was founded in 2001 in Copenhagen Denmark with the mission of designing liquid and gas honey comb wall flow filters. In 2002 the company started selling silicon carbide DPFs in Europe and in 2004 in North America. In 2005 Liqtech NA opened a full operating plant in White Bear Lake, MN to serve the North American market. Liqtech has thousands of its DPFs on the road with a significant percentage operating more that 250,000 miles.
Products and Markets
Liqtech has created its filters to serve primarily larger vehicle markets where low engine heat creates problems in regenerating at programmed intervals. Transit vehicles, school buses, refuse trucks and off road vehicles are typical markets where Liqtech filters are used. Liqtech has specially constructed segment, pie shaped rather than square so the DPFs have added strength and integrity in large filter sizes.
Liqtech filters are available from one inch to 15 inches in diameter and of lengths that range from 3 inches to 20 inches. Liqtech also makes 6 inch by 6 inch by 14 inch rectangular filters that can be assembled into 12 inch square filters that are used on large power plant, train and large marine applications. Filters are available in 90 cpsi, 150 cpsi and 180 cpsi configurations. The 90 cpsi DPFs have the highest soot loading capability and are typically used in retrofit application and in systems that use electric and burner regeneration methods. 150 cpsi filters, with a soot load capacity of 11-12 grams of soot load per liter are typically used in applications with passive regeneration, or in applications where the DPF is catalyzed for passive regeneration but the system has an active back-up system.
Liqtech works with customers on custom designs and can also furnish catalyzed or canned filters. The Company also provides small pore size membranes on the walls of its filters in applications where filtration of extra fine particles is required.