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Experimental and CFD investigation of re-agent mixing in an SCR system

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dc.contributor.authorIvaturi, Krishna, author
dc.contributor.authorOlsen, Daniel B., advisor
dc.contributor.authorMitchell, Charles E., committee member
dc.contributor.authorMeroney, Robert, committee member
dc.date.accessioned2007-01-03T04:28:23Z
dc.date.available2007-01-03T04:28:23Z
dc.date.issued2007
dc.description.abstractNitrogen oxides (NOx) cause a gamut of problems such as harmful particulate matter, ground level ozone (smog) and acid rain. Currently, a significant capital is being invested researching new techniques to control NOx emissions. One of the best ways to breakdown NOx is the Selective Catalytic Reduction (SCR) after-treatment method. A reducing agent (re-agent) is injected into exhaust gases and passed through a catalyst that facilitates NOx breakdown into Nitrogen and Water. To ensure effective NOx conversion, there must be uniform mixing between re-agent and exhaust gas upstream of the catalyst blocks. The current thesis focuses on investigating the mixing quality for an SCR test system employed for a 2-stroke lean-bum natural gas engine. CFD investigations were conducted to simulate the physical flow process. The mixing quality for different injector locations and the effect of utilizing a downstream in-line mixer was investigated. The CFD simulations were compared to experimental results. To measure ammonia concentrations experimentally, a traversing probe was designed and built. Re-agent concentrations were measured at various locations on a plane slightly upstream of the catalyst substrate. Detailed discussion is presented on different cases of CFD analysis. Experiments were conducted for the best and worst case of mixing based on CFD computation. Results suggest that a mixer plays a vita1 role in improving the mixing.
dc.format.mediummasters theses
dc.identifier2007_Fall_Ivaturi_Krishna.pdf
dc.identifierETDF2007100001MCEN
dc.identifier.urihttp://hdl.handle.net/10217/40265
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relationCatalog record number (MMS ID): 991024671419703361
dc.relationTD886.5.I937 2007
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectAutomobiles -- Motors -- Exhaust gas
dc.subjectNitrogen oxides
dc.subjectCatalysis
dc.subjectAir -- Purification
dc.titleExperimental and CFD investigation of re-agent mixing in an SCR system
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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