The effect of reformer gas mixture on the performance and emissions of an HSDI diesel engine
The effect of reformer gas mixture on the performance and emissions of an HSDI diesel engine
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DOI：
10.1016/j.ijhydene.2014.03.090
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发表时间：
2014-06-15
影响因子：
7.2
通讯作者：
Megaritis, Athanasios
中科院分区：
文献类型：
--
作者：
Christodoulou, Fanos;Megaritis, Athanasios
废气辅助燃料重整是一种很有吸引力的车载制氢方法，它可以开辟柴油机制氢的新领域。除了氢气，并且取决于促进的反应，重整产物通常含有大量的一氧化碳，其作为副产物产生。此外，重整气体通过进气管进入发动机导致进气氮氧比的增加。因此，有必要研究合成气和氮气的混合物如何影响柴油发动机的性能和排放，以便更好地了解将燃料重整器产品供应到发动机中的效果。在目前的研究工作中，一个瓶装的气体混合物与H-2和CO的内容类似的典型的柴油重整产品的气体注入到一个高速柴油机的进气管。与合成气相同体积分数的氮气（从单独的瓶中抽取）同时进入入口管。进行了排气分析和性能计算，并与纯柴油机运行进行了比较。引入合成气+ N-2气体混合物可在发动机操作窗口的大范围内同时减少氮氧化物和烟雾排放的形成。对瓶装一氧化碳利用率的估计表明，通过增加负荷或速度，可以更有效地利用所允许的一氧化碳。一般来说，当瓶装一氧化碳利用率超过88%时，二氧化碳排放量会增加。分离的H-2和N-2的影响表明，CO稀释火焰促进烟雾的形成。当进气富含合成气+ N-2时，发动机转速的增加导致最大压力上升率（dp/da）的减小。负载对dp/da的影响取决于发动机转速。最后，发动机在纯柴油上运行时更省油。版权所有（C）2014，作者。由Elsevier Ltd代表Hydrogen Energy Publications，LLC出版。
Exhaust gas assisted fuel reforming is an attractive on-board hydrogen production method, which can open new frontiers in diesel engines. Apart from hydrogen, and depending on the reactions promoted, the reformate typically contains a significant amount of carbon monoxide, which is produced as a by-product. Moreover, admission of reformed gas into the engine, through the inlet pipe, leads to an increase of intake air nitrogen to oxygen ratio. It is therefore necessary to study how a mixture of syngas and nitrogen affects the performance and emissions of a diesel engine, in order to gain a better understanding of the effects of supplying fuel reformer products into the engine. In the current research work, a bottled gas mixture with H-2 and CO contents resembling those of typical diesel reformer product gas was injected into the inlet pipe of an HSDI diesel engine. Nitrogen (drawn from a separate bottle) at the same volumetric fraction to syngas was simultaneously admitted into the inlet pipe. Exhaust analysis and performance calculation was carried out and compared to a neat diesel operation. Introduction of syngas + N-2 gas mixture resulted in simultaneous reduction of the formation of NOx and smoke emissions over a broad range of the engine operating window. Estimation of the bottled carbon monoxide utilisation showed that by increasing either the load or the speed the admitted carbon monoxide is utilised more efficiently. As a general rule, CO2 emissions increase when the bottled carbon monoxide utilisation is approximately over 88%. Isolation of the H-2 and N-2 effect revealed that a CO diluted flame promotes the formation of smoke. When the intake air is enriched with syngas + N-2, an increase of engine speed results in reduction of maximum pressure rise rate (dp/da). The effect of load on dp/da varies depending on engine speed. Finally, the engine is more fuel efficient when running on neat diesel. Copyright (C) 2014, The Authors. Published by Elsevier Ltd on behalf of Hydrogen Energy Publications, LLC.