Purifilter – EGR from CDTi is the newest technology integrated diesel particulate filter / exhaust cleaner and silencer, which efficiently removes particulate matter (PM) and gaseous pollutants, CO and HC. The particles (soot), are automatically burnt off (self regeneration) at exhaust temperatures of 280 degrees C or higher.
Purifilter – EGR is the first self regenerating particulate filter system based on silicone carbide (SiC), which offers superior thermal durability and extended service life. The advanced base and precious metal catalyst system, installed directly ahead of the filter not only lowers the balance point of the soot, but also provides an extremely high reduction of CO and HC.
When the exhaust passes through the micro-porous filter walls the soot particles in the exhaust gas are separated and collected. At the same time the catalytic coating oxidises the gaseous pollutants of hydrocarbon (HC) and carbon monoxide (CO) to harmless carbon dioxide and water. The catalytic coating also lowers the ignition temperature of the soot to 280 – 380 degrees C, depending on the composition of the soot and the condition of the engine. The lowered ignition temperature starts an oxidation process that burns the collected soot automatically under normal operating conditions.
The filtration is so efficient that any debris passing through the engine combustion chamber will also be collected (i.e. lube oil ash, wear metals and intake air debris etc.)
This debris should be removed to prevent excessive build-up. The cleaning intervals will depend on the condition of the engine and the operating conditions.
The Purifilter is intended for permanent installation on vehicles and machines in heavy operation running regularly with exhaust temperatures reaching 280 degrees C or higher. At lower temperatures the separated particles will be stored in the filter and increase the engine back-pressure. Idle periods should be kept to a minimum.
Exhaust temperature is dependant on a number of variables such as duty cycle, soot composition, make of engine etc. If a vehicle’s duty cycle is in question, data logging must be performed to ensure that the Purifilter will regenerate during the vehicle’s current and normal operation.
* Please contact us for more information
* Western Tydens recommend the use of Ultra-Low-Sulphur Diesel (Max 50ppm)
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