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Characteristics of Exhaust Emissions from a Heavy-Duty Diesel Engine Retrofitted to Operate in Methane/Diesel Dual-Fuel Mode
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 08, 2013 by SAE International in United States
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The need for a cleaner and less expensive alternative energy source to conventional petroleum fuels for powering the transportation sector has gained increasing attention during the past decade. Special attention has been directed towards natural gas (NG) which has proven to be a viable option due to its clean-burning properties, reduced cost and abundant availability, and therefore, lead to a steady increase in the worldwide vehicle population operated with NG. The heavy-duty vehicle sector has seen the introduction of natural gas first in larger, locally operated fleets, such as transit buses or refuse-haulers. However, with increasing expansion of the NG distribution network more drayage and long-haul fleets are beginning to adopt natural gas as a fuel. Traditionally, natural gas engines are operated over an Otto-cycle employing a stoichiometric combustion strategy, and using sparkplugs to ignite the fuel and a three-way catalyst (TWC) to mitigate emissions of NOx, CO as well as HC. Alternatively, combusting NG in a Diesel engine would result in higher combustion efficiencies, inherent to the Diesel-cycle, thus, reduce fuel consumption and therefore, further amplify the CO2 emissions benefits of NG.
In this regard, ‘retrofit kits’ have been developed in order to convert standard Diesel engines into Diesel-NG dual-fueled engines by taking advantage of the auto-ignition properties of Diesel fuel. These technologies basically substitute a given amount of energy delivered by the Diesel fuel with NG that is being injected into the intake-runners leading to the combustion chambers. The NG substitution rate primarily depends on engine operating modes (i.e. speed and torque) and specific engine calibrations and is seamlessly adjustable. Therefore, particulate matter (PM) as well as gaseous emissions are expected to differ when the engine is being operated in dual-fuel mode as compared to conventional diesel fuel operation only.
The primary objective of this study was to experimentally investigate the physical and chemical properties of the emissions products from a heavy-duty Diesel engine (HDDE) after conversion to Diesel-CNG dual-fueled operation. To this aim, a 11.9L Mack AC 460P (MY 2005) HDDE equipped with a conversion kit for dual-fuel operation has been evaluated over the 13-mode European Stationary Cycle (ESC) and Federal Test Procedure (FTP) at West Virginia University's Engine and Emissions Research Laboratory (EERL). Particulate matter emissions were sampled using the gravimetric filter method and characterized in terms of particle number concentrations and size distributions utilizing a Differential Mobility Spectrometer (DMS) from Cambustion (model DMS-500). Data were collected using two different sampling systems, namely through a constant volume sampling system (CVS) and a custom-made double mini-dilution system using ejector-type dilutors allowing to sample directly from the exhaust stack. Results showed a significant reduction of oxides of nitrogen and carbon dioxide emission levels at the expenses of hydrocarbons and carbon monoxide which, on the contrary, increased drastically. Particulate matter emission levels experienced an increase when operating the engine in dual-fuel mode. This fact together with the increased emissions of hydrocarbons and carbon monoxide suggested a deterioration of the quality of combustion.
- Alessandro Cozzolini - West Virginia Univ.
- Daniele Littera - West Virginia Univ.
- Ross Ryskamp - West Virginia Univ.
- John Smallwood - West Virginia Univ.
- Marc Besch - West Virginia Univ.
- Mario Velardi - West Virginia Univ.
- Hemanth Kappanna - West Virginia Univ.
- Daniel Carder - West Virginia Univ.
- Mridul Gautam - West Virginia Univ.
CitationCozzolini, A., Littera, D., Ryskamp, R., Smallwood, J. et al., "Characteristics of Exhaust Emissions from a Heavy-Duty Diesel Engine Retrofitted to Operate in Methane/Diesel Dual-Fuel Mode," SAE Technical Paper 2013-24-0181, 2013, https://doi.org/10.4271/2013-24-0181.
- Littera , D. , Besch , M. , Cozzolini , A. , Carder , D. et al. Fresh and Aged SCRT Systems Retrofitted on a MY 1998 Class-8 Tractor: Investigation on In-use Emissions SAE Technical Paper 2011-24-0175 2011
- US Environmental Protection Agency Diesel Retrofit Technology - An Analysis of the Cost-Effectiveness of Reducing Particulate Matter Emissions from Heavy-Duty Diesel Engines through Retrofits EPA420-S-06-002 March 2006
- Johnson , T. Vehicular Emissions in Review SAE Int. J. Engines 5 2 216 234 2012 10.4271/2012-01-0368
- Karim , G.A. , Khan , M.O. Examination of effective rates of combustion heat release in a dual-fuel engine J. Mech. Eng. Sci. 10 13 23 1968
- Karim , G.A. A review of combustion processes in the dual-fuel engine: the gas diesel engine Prog Energy Combust Sci 6 277 285 1980
- Karim , G. An Examination of Some Measures for Improving the Performance of Gas Fuelled Diesel Engines at Light Load SAE Technical Paper 912366 1991 10.4271/912366
- Karim , G. and Liu , Z. A Predictive Model for Knock in Dual Fuel Engines SAE Technical Paper 921550 1992 10.4271/921550
- Liu , Z. , Karim , G.A. Simulation of combustion processes in gas-fuelled diesel engines Proc Inst Mech Eng (Part A), J Power Energy 211 159 69 1997
- Karim , G.A. Combustion in gas fueled compression: ignition engines of the dual fuel type Trans ASME, J Eng Gas Turbines Power 125 827 36 2003
- Papagiannakis , R.G. , Rakopoulos , C.D. , Hountalas , D.T. , Rakopoulos , D.C. Emission characteristics of high speed, dual fuel, compression ignition engine operating in a wide range of natural gas/diesel fuel proportions Fuel 89 1397 1406 2010
- Karim , G.A. The dual fuel engine Automotive engine alternatives Evans RL 83 104 1987
- Carlucci , A.P. , de Risi , A. , Laforgia , D. , Naccarato , F. Experimental investigation and combustion analysis of a direct injection dual-fuel diesel-natural gas engine Energy 33 256 63 2008
- Abdelaal , M.M. , Hegab , A.H. Combustion and emission characteristics of a natural gas-fueled diesel engine with EGR Energy Conversion and Management 64 301 312 2012
- Shah , A. , Thipse , S. , Tyagi , A. , Rairikar , S. et al. Literature Review and Simulation of Dual Fuel Diesel-CNG Engines SAE Technical Paper 2011-26-0001 2011 10.4271/2011-26-0001
- Harrington , J. , Munshi , S. , Nedelcu , C. , Ouellette , P. et al. Direct Injection of Natural Gas in a Heavy-Duty Diesel Engine SAE Technical Paper 2002-01-1630 2002 10.4271/2002-01-1630
- McTaggart-Cowan , G.P. , Bushe , W.K. , Hill , P.G. , Munshi , S.R. A supercharged heavy-duty diesel single cylinder research engine for high-pressure direct injection of natural gas Int J Engine Res 4 315 30 2003
- Papagiannakis , R.G. , Hountalas , D.T. Combustion and exhaust emission characteristics of a dual fuel compression ignition engine operated with pilot diesel fuel and natural gas Energy Conversion and Management 45 2971 87 2004
- Papagiannakis , R.G. , Kotsiopoulos , P.N. , Zannis , T.C. , Yfantis , E.A. , Hountalas , D.T. , Rakopoulos , C.D. Theoretical study of the effects of engine parameters on performance and emissions of a pilot ignited natural gas diesel engine Energy 35 1129 38 2010
- Wannatong , K. , Akarapanyavit , N. , Siengsanorh , S. , and Chanchaona , S. Combustion and Knock Characteristics of Natural Gas Diesel Dual Fuel Engine SAE Technical Paper 2007-01-2047 2007 10.4271/2007-01-2047
- Shengua , L. , Ziyan , W. , Jiang , R. Development of compressed natural gas/diesel dual-fuel turbocharged compression ignition engine Proc Inst Mech Eng Part D, J Automob Eng 217 839 45 2003
- Mustafi , N. and Raine , R. A Study of the Emissions of a Dual Fuel Engine Operating with Alternative Gaseous Fuels SAE Technical Paper 2008-01-1394 2008 10.4271/2008-01-1394
- Uma , R. , Kandpal , T.C. , Kishore , V.V.N. Emissions characteristics of an electricity generation system in diesel alone and dual fuel modes Biomass and Bioenery 27 195 203 2004
- Turns , S.R. An introduction to combustion: concepts and applications McGraw-Hill 2000
- Heywood , J.B. Internal combustion engine fundamentals McGraw-Hill 1988
- Lavoie , G.A. , Heywood , J.B. , Keck , J.C. Experimental and theoretical study of nitric oxide formation in internal combustion engines Combust Sci Technol 1 313 26 1970