PFI (port fuel injection) of n-butanol and direct injection of biodiesel to attain LTC (low-temperature combustion) for low-emissions idling in a compression engine

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• 作者：Valentin Soloiu ; ^{vsoloiu@georgiasouthern.edu} ; Marvin Duggan ; Spencer Harp ; Brian Vlcek ; David Williams
• 关键词：n-Butanol combustion ; LTC (low-temperature combustion) ; PCCI (premixed charge compression ignition) ; PFI (port fuel injection)
• 刊名：Energy
• 出版年：2013
• 出版时间：1 April, 2013
• 年：2013
• 卷：52
• 期：Complete
• 页码：143-154
• 全文大小：2176 K

文摘

In this study, n-butanol (port fuel injection) PFI was investigated in a direct injection compression ignition engine while at idling speeds, and loads, 1-3?bar IMEP (indicated mean effective pressure) in order to determine the effects on combustion, efficiency, emissions, and specifically, a modified tradeoff of soot and nitrogen oxides. As a result, the engine entered into (low-temperature combustion) LTC regions, for selected loads and speeds. Compared with the baseline taken with ultra-low sulfur diesel no. 2, the heat release with n-butanol in (premixed charge compression ignition) PCCI mode, has resulted in a 75 % reduction from the maximum values, while a secondary peak appeared where the diffusion combustion typically occurs in the power stroke. At 3?bar IMEP an early, (bottom dead center) BTDC low-temperature heat release was found that began 6¡ã earlier than for the diesel reference cycle, and corresponding to 1200?K. Soot emissions showed a massive decrease of about 98 % , concurrently with a 74 % reduction of nitrogen oxides at 3 IMEP by controlling the combustion phases and by modifying the classical NO_x-soot tradeoff. The results of this work prove that biodiesel combined with n-butanol PFI in PCCI and LTC are very effective in simultaneously reducing soot and NO_x at idling speeds.