James Warren. Johnson Matthey, Orchard Road, Royston, Herts., SG8 5HE, England. Ronny Allansson. Johnson Matthey, Svenska Emissionsteknik AB, S-421 ...
SAE TECHNICAL PAPER SERIES
1999-01-0468
Optimized Filter Design and Selection Criteria for Continuously Regenerating Diesel Particulate Traps Athanasios G. Konstandopoulos and Evangelos Skaperdas Foundation for Research and Technology - Hellas/Chemical Process Engineering Research Institute (FORTH/CPERI) PO Box 361,Thermi Thessaloniki 57001, Greece
James Warren Johnson Matthey, Orchard Road, Royston, Herts., SG8 5HE, England
Ronny Allansson Johnson Matthey, Svenska Emissionsteknik AB, S-421 31 Vastra Frolunda, Sweden
Reprinted From: Diesel Exhaust Aftertreatment 1999 (SP-1414)
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1999-01-0468
Optimized Filter Design and Selection Criteria for Continuously Regenerating Diesel Particulate Traps Athanasios G. Konstandopoulos, Evangelos Skaperdas Foundation for Research and Technology - Hellas/Chemical Process Engineering Research Institute (FORTH/CPERI) PO Box 361,Thermi Thessaloniki 57001, Greece
James Warren Johnson Matthey, Orchard Road, Royston, Herts., SG8 5HE, England
Ronny Allansson Johnson Matthey, Svenska Emissionsteknik AB, S-421 31 Vastra Frolunda, Sweden Copyright © 1998 Society of Automotive Engineers, Inc.
ABSTRACT Upcoming (2005) particulate matter standards for diesel powered vehicles are likely to require the deployment of aftertreatment devices, such as particulate filters to ensure emissions compliance. A major challenge in the development of diesel filter systems has been the achievement of filter regeneration by the oxidation of the collected particulate matter in a reliable and cost-effective manner. Recently the emergence of the so-called continuously regenerating trap (CRTTM) in conjunction with the future availability of very low-sulphur diesel fuel, represents a promising solution to the diesel particulate control problem. In the present study, design and selection criteria are devised, regarding the sizing of wall flow diesel particulate filters for application in CRTTM systems, employing a range of analytical and 3-D CFD tools validated against experimental data. INTRODUCTION Diesel particulate emissions, because of their chemical composition and extremely small size (< 1µm), are a subject of health and environmental concern. Diesel emissions can be controlled either at their source, through engine design and combustion process modifications or by exhaust gas aftertreatment using particulate filters [1]. Although the behavior of diesel filters has been studied for many years in several industrial and research laboratories, see e.g. [2-4], organized results from these studies appear to a great extent fragmentary. As a consequence empirical approaches still enjoy widespread practice in order to select the optimum filter size and geometry for a particular application.
Filters control diesel particulate matter (soot) emissions by physically trapping the particles in their structure and need to be periodically cleaned (regenerated) to avoid excessive fuel penalty on the engine. While major problems regarding the regeneration behavior of soot filters remain to be solved, a novel Continuously Regenerating Trap (CRTTM) concept [5,6] has exhibited very promising performance in a number of tests [7,8] and currently represents the state-of-the-art in terms of passive regeneration systems. Presently the major obstacle in the wide spread application of the CRTTM is the requirement for low sulphur fuel (
