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    Improving Ethanol Life Cycle Energy Efficiency by Direct Utilization of Wet Ethanol in HCCI Engines

    Source: Journal of Energy Resources Technology:;2007:;volume( 129 ):;issue: 004::page 332
    Author:
    Joel Martinez-Frias
    ,
    Salvador M. Aceves
    ,
    Daniel L. Flowers
    DOI: 10.1115/1.2794768
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Homogeneous charge compression ignition (HCCI) is a new engine technology with fundamental differences over conventional engines. HCCI engines are intrinsically fuel flexible and can run on low-grade fuels as long as the fuel can be heated to the point of ignition. In particular, HCCI engines can run on “wet ethanol:” ethanol-in-water mixtures with high concentration of water. Considering that much of the energy required for processing fermented ethanol is spent in distillation and dehydration, direct use of wet ethanol in HCCI engines considerably shifts the energy balance in favor of ethanol. The results of the paper show that a HCCI engine with efficient heat recovery can operate on a mixture of 35% ethanol and 65% water by volume while achieving a high brake thermal efficiency (38.7%) and very low NOx (1.6ppm, clean enough to meet any existing or oncoming emissions standards). Direct utilization of ethanol at a 35% volume fraction reduces water separation cost to only 3% of the energy of ethanol and coproducts (versus 37% for producing pure ethanol) and improves the net energy gain from 21% to 55% of the energy of ethanol and coproducts. Wet ethanol utilization is a promising concept that merits more detailed analysis and experimental evaluation.
    keyword(s): Fuels , Engines , Ethanol , Water , Homogeneous charge compression ignition engines , Combustion , Mixtures AND Energy budget (Physics) ,
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      Improving Ethanol Life Cycle Energy Efficiency by Direct Utilization of Wet Ethanol in HCCI Engines

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    contributor authorJoel Martinez-Frias
    contributor authorSalvador M. Aceves
    contributor authorDaniel L. Flowers
    date accessioned2017-05-09T00:23:29Z
    date available2017-05-09T00:23:29Z
    date copyrightDecember, 2007
    date issued2007
    identifier issn0195-0738
    identifier otherJERTD2-26548#332_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/135603
    description abstractHomogeneous charge compression ignition (HCCI) is a new engine technology with fundamental differences over conventional engines. HCCI engines are intrinsically fuel flexible and can run on low-grade fuels as long as the fuel can be heated to the point of ignition. In particular, HCCI engines can run on “wet ethanol:” ethanol-in-water mixtures with high concentration of water. Considering that much of the energy required for processing fermented ethanol is spent in distillation and dehydration, direct use of wet ethanol in HCCI engines considerably shifts the energy balance in favor of ethanol. The results of the paper show that a HCCI engine with efficient heat recovery can operate on a mixture of 35% ethanol and 65% water by volume while achieving a high brake thermal efficiency (38.7%) and very low NOx (1.6ppm, clean enough to meet any existing or oncoming emissions standards). Direct utilization of ethanol at a 35% volume fraction reduces water separation cost to only 3% of the energy of ethanol and coproducts (versus 37% for producing pure ethanol) and improves the net energy gain from 21% to 55% of the energy of ethanol and coproducts. Wet ethanol utilization is a promising concept that merits more detailed analysis and experimental evaluation.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleImproving Ethanol Life Cycle Energy Efficiency by Direct Utilization of Wet Ethanol in HCCI Engines
    typeJournal Paper
    journal volume129
    journal issue4
    journal titleJournal of Energy Resources Technology
    identifier doi10.1115/1.2794768
    journal fristpage332
    journal lastpage337
    identifier eissn1528-8994
    keywordsFuels
    keywordsEngines
    keywordsEthanol
    keywordsWater
    keywordsHomogeneous charge compression ignition engines
    keywordsCombustion
    keywordsMixtures AND Energy budget (Physics)
    treeJournal of Energy Resources Technology:;2007:;volume( 129 ):;issue: 004
    contenttypeFulltext
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