Miratech CombiKat filter receives California verification

11 July 2006

Miratech Corporation announced that the CombiKat® CBS diesel particulate filter has received full California Air Resources Board (ARB) Level 3 Verification for stationary diesel engines used for prime power and emergency power generation, model year 1996-2006, certified at a PM emission level ≤ 0.2 g/bhp-hr. The unit has also received ARB’s Conditional Level 3 Verification for pumping applications, pending the completion of a 500 hour durability demonstration.

While Level 3 Verification requires at least 85% reduction in PM emissions, the CombiKat CBS actually achieved greater than 90% reduction in all tests. In addition, the unit achieved reduction of HC and CO, without any increase in nitrogen dioxide (NO₂) or other oxides of nitrogen (NOx), said Miratech.

The filter regenerates passively, and requires a certain minimum exhaust gas temperature, which ranges from about 320°C to 440°C, depending on the engine-out PM emission level. The filter does not require ultra low sulfur fuel; it has been verified for use with diesel fuel of 500 ppm S.

The CombiKat CBS uses technology developed by long-time Miratech partner, Swiss-based HUG Engineering. The unit utilizes catalyzed silicon carbide (SiC) filters formed in square blocks, which can be stacked in differently sized housings to cover a wide range of engine sizes. The CombiKat also features side ports and access doors, to allow filter cleaning and other maintenance in situ, without need for disassembly.

Source: Miratech, California ARB (executive order | verification letter | engine families)