Catalyzed Particulate Filter Passive Oxidation Study with ULSD and Biodiesel Blended Fuel Michigan Technological University

Format:

Conference/Event

Author/Creator:

Shiel, Shiel, author.

Contributor:

Hutton, Christopher

Johnson, John H.

Naber, Jeffrey

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

A 2007 Cummins ISL 8.9L direct-injection common rail dieselengine rated at 272 kW (365 hp) was used to load the filter to 2.2g/L and passively oxidize particulate matter (PM) within a 2007 OEMaftertreatment system consisting of a diesel oxidation catalyst(DOC) and catalyzed particulate filter (CPF). Having a betterunderstanding of the passive NO₂ oxidation kinetics of PM withinthe CPF allows for reducing the frequency of active regenerations(hydrocarbon injection) and the associated fuel penalties. Beingable to model the passive oxidation of accumulated PM in the CPF iscritical to creating accurate state estimation strategies. The MTU1-D CPF model will be used to simulate data collected from thisstudy to examine differences in the PM oxidation kinetics when soymethyl ester (SME) biodiesel is used as the source of fuel for theengine.A test procedure developed by Hutton and others, was modified toimprove the ability to model the experimental data and provideadditional insight into passive oxidized PM in a CPF. A testprotocol and plan was developed to allow PM oxidation rates by NO₂to be determined from engine test cell data. An experimental matrixconsisting of CPF inlet temperatures from 250 to 450°C with varyingNOX/PM from 25 to 583 and NO₂/PM ratios from 5 to 240 wasused.SME biodiesel was volumetrically blended with ULSD in 10% (B10)and 20% (B20) portions. This blended fuel was then used to evaluatethe effect of biodiesel on passive oxidation rates. Four tests wereperformed with B10 and four tests with B20. Gathering data todetermine the effect of fuel type (ULSD and biodiesel blends) on PMoxidation is the primary goal. Data from fifteen tests completedwith ultra-low sulfur diesel (ULSD) fuel and one additional engineplatform is used to compare to results from SME biodieseltests.The experimental reaction rates during passive oxidation variedbased upon the average CPF temperature, NO₂ concentrations, and theNOX/PM ratios for each engine and with all fuels. The datacollected is directly comparable to ULSD data from priorexperimental tests, but requires a high fidelity model thatincludes NO₂ and thermal oxidation mechanisms and back diffusion todetermine the details of the PM oxidation process

Notes:

Vendor supplied data

Publisher Number:

2012-01-0837

Access Restriction:

Restricted for use by site license