Diesel Particulate Filter Systems for Off-Road Applications

Diesel Particulate FilterSystems for Off-RoadApplicationsWhy Diesel Emissions Control?Diesel engines move the world. However, they pollute.Concerns over the adverse health effects of diesel exhaust haveprompted regulations designed to cut particulate matter emissions.The outcome has been a growing demand for diesel emissionscontrol systems.How Are Diesel Emissions Controlled?The answer to the problem of diesel pollution is to filter particulatefrom the exhaust using a diesel particulate filter (DPF).PM trapped inside the filter must be removed periodically to preventthe filter from blocking. This filter regeneration is key to an effectiveemissions control system.Johnson Matthey’s DPF technology is unique in this field because ofthe flexibility it offers to users. Johnson Matthey has developed three different approaches to filter regeneration and incorporatedthem in a modular design concept that allows the use of differentregeneration modes as circumstances require.Benefits of Johnson Matthey’s DPF TechnologyJohnson Matthey’s DPF technology is specifically designed for off-road vehicles.The versatile DPF systems approach means that there is a solutionfor every application, regardless of fuel quality, duty cycle or engineemissions. Systems are capable of fitting engines with powerratings from a few kW to >1MW.The selection and sizing of systems is based on Johnson Matthey’sexpertise in emissions control combined with its experiencesupplying the off-road sector.By virtue of their durability and fuel efficiency diesel engines are the power source behind commercial transport, as well as off-roadequipment for mining and construction.Identified as a toxic air contaminant, diesel engine exhaust containsgaseous pollutants and particulate matter (PM), comprising carbonsoot and a soluble organic fraction (SOF) that can condense on the soot.The DPF systems are fabricated in stainless steel housingsmechanically robust enough to survive in the off-road environment. The modular design allows easy servicing and all systems have electronic monitoring capability.Wherever Government approvals are required these have been secured.Support and service is provided locally but utilising Johnson Matthey’s global network of technology, sales and manufacturing plants.Johnson Matthey’s Regeneration Techniques:inletcatalystfilteroutletTypeDPF-CRT®DPFiDPFiSRegeneration TechniqueThe Continuously Regenerating Trap(CRT®) uses a catalyst in front of thefilter. As well as oxidising the SOF,the catalyst generates nitrogen dioxidethat removes soot from the filterAn electrical heater is used to raise the temperature inside the filter to burn away the PMA fuel additive is metered into the diesel fuel. It acts as a catalyst, oxidisingthe PM trapped in the filterUsed whenUltra low sulphur diesel is availableand appropriate engine type andduty cycle applyEquipment runs on higher sulphurfuel and when low enginespeeds/loads give rise to lowexhaust temperaturesEquipment runs on higher sulphurfuel and duty cycle gives high exhaust temperatureselectricalheaterFor further information on these productsplease contact Johnson Matthey CatalyticSystems Division (JM CSD) at:Johnson Matthey GmbHOtto-Volger-Strasse, 9bD-65843 Sulzbach/Ts.GermanyTel: + 49 6196 7038 13Fax: + 49 6196 724 50www.jmgmbh.comJM CSD Sites Worldwide