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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >AIR SEPARATION MEMBRANES -AN ALTERNATIVE TO EGR IN LARGE BORE NATURAL GAS ENGINES
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AIR SEPARATION MEMBRANES -AN ALTERNATIVE TO EGR IN LARGE BORE NATURAL GAS ENGINES

机译：空气分离膜-大型天然气发动机中EGR的替代物

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Air Separation Membranes (ASM) could potentially replace Exhaust Gas Recirculation (EGR) technology in engines due to the proven benefits in NOx reduction but without the drawbacks of EGR. Previous investigations of Nitrogen Enriched Air (NEA) combustion using nitrogen bottles showed up to 70% NOx reduction with modest 2% nitrogen enrichment. The investigation in this paper was performed with an ASM capable of delivering at least 3.5% NEA to a single cylinder spark ignited natural gas engine.rnLow Temperature Combustion (LTC) is one of the pathways to meet the mandatory ultra low NOx emissions levels set by regulatory agencies. In this study, a comparative assessment is made between natural gas combustion in standard air and 2% NEA. Enrichment beyond this level degraded engine performance in terms of power density, Brake Thermal Efficiency (BTE), and unburned hydrocarbon (UHC) emissions for a given equivalence ratio. The ignition timing was optimized to yield maximum brake torque for standard air and NEA. Subsequently, conventional spark ignition (SI) was replaced by laser ignition (LI) to extend lean ignition limit. Both ignition systems were studied under a wide operating range from Ψ: 1.0 to the lean misfire limit. It was observed that with 2% NEA, for a similar fuel quantity, the equivalence ratio (Ψ) increases by 0.1 relative to standard air conditions. Analysis showed that lean burn operation along with NEA and alternative ignition source such as LI could pave the pathway for realizing lower NOx emissions with a slight penalty in BTE.
机译：空气分离膜（ASM）可能会取代发动机中的废气再循环（EGR）技术，这是由于已证明的减少NOx的优势，但没有EGR的缺点。先前使用氮气瓶进行的富氮空气（NEA）燃烧研究表明，氮含量降低2％时，氮氧化物的还原量最多可达70％。本文的研究是使用能够向单缸火花点火天然气发动机提供至少3.5％NEA的ASM进行的。低温燃烧（LTC）是满足强制性超低NOx排放水平的途径之一监管机构。在这项研究中，在标准空气中的天然气燃烧和2％NEA之​​间进行了比较评估。在给定的当量比下，超过此水平的浓缩会使发动机性能，功率密度，制动热效率（BTE）和未燃烧的碳氢化合物（UHC）排放降低。优化了点火正时，以产生标准空气和NEA的最大制动扭矩。随后，将传统的火花点火（SI）替换为激光点火（LI）以扩展稀薄点火极限。在从Ψ：1.0到稀薄失火极限的宽泛工作范围内研究了两种点火系统。可以看出，当NEA为2％时，对于相似的燃料量，当量比（Ψ）相对于标准空气条件增加了0.1。分析表明，稀薄燃烧操作与NEA和替代点火源（如LI）一起可以为实现更低的NOx排放量铺平道路，而BTE会有轻微的损失。

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