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首页> 外文会议>ASME Internal Combustion Engine Division technical conference >COMPARATIVE ANALYSIS OF EGR AND AIR DILUTION IN SPARK-IGNITED NATURAL GAS ENGINES
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COMPARATIVE ANALYSIS OF EGR AND AIR DILUTION IN SPARK-IGNITED NATURAL GAS ENGINES

机译：火花点火天然气发动机中EGR和空气稀释的比较分析

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Industrial natural gas engines are used in a wide range of applications, each with unique requirements in terms of power density, initial cost, thermal efficiency, and other factors. As a result of these requirements, distinct engine designs have evolved to serve various applications. Heavy-duty spark-ignited engines can generally be divided into two broad categories based on their charge characteristics and method of emissions control. Stoichiometric engines are widely used in applications where first cost, absolute emissions and relative engine simplicity are more important than fuel consumption. In most of the developed world, stoichiometric engines are equipped with a three-way catalyst to control emissions of nitrogen oxides (NO_x) as well as products of incomplete combustion and raw unburned fuel. Dilution of the charge mixture with excess air reduces the peak combustion gas temperature and associated heat rejection. As a result, lean burn engines are generally able to achieve higher efficiency and power density without inducing excessive component temperatures or end gas knock. NO_x formation is mitigated by the reduced gas temperatures, such that most regulatory standards can currently be met in-cylinder. Significant obstacles exist to meeting more stringent future emissions regulations in this manner, however. Another possible strategy is to dilute the charge mixture with recirculated exhaust gas. This offers similar benefits as air dilution while maintaining the ability to use a three-way catalyst for emissions after-treatment. While similar principles apply in either case, the choice of diluent can have a significant impact on knock resistance, emissions formation, thermal efficiency, and other parameters of importance to engine developers and operators. This work aimed to examine the unique characteristics of EGR and air dilution from a thermodynamic and combustion perspective. A combination of cycle simulation tools and experimental data from a single-cylinder test engine was applied to demonstrate the impact of diluent properties on a fundamental level, and to illustrate departures from idealized behavior and practical considerations specific to the development of combustion systems for spark-ignited natural gas engines.
机译：工业天然气发动机用于各种应用中，每个应用都具有独特的要求，初始成本，热效率和其他因素。由于这些要求，不同的发动机设计已经进化以提供各种应用。重型火花点火发动机通常根据其电荷特性和排放控制方法分为两大类。化学计量发动机广泛用于首先成本，绝对排放和相对发动机简单性比燃料消耗更重要的应用。在大多数发达国家中，化学计量发动机配备了三元催化剂，以控制氮氧化物的排放（NO_X）以及不完全燃烧和未燃烧的燃料的产物。用过量的空气稀释电荷混合物会降低峰燃烧气体温度和相关的排出。结果，贫燃烧发动机通常能够实现更高的效率和功率密度而不诱导过量的部件温度或最终气体敲击。通过降低的气体温度减轻了NO_X形成，因此目前可以在圆柱体中满足大多数监管标准。然而，以这种方式满足更严格的未来排放法规，存在重大障碍。另一种可能的策略是用再循环的废气稀释电荷混合物。这提供了类似的益处作为空气稀释，同时保持使用三元催化剂以进行排放后的排放能力。虽然在任何一种情况下适用类似原则，但稀释剂的选择可能对发动机开发人员和运营商的重要性对抗抗抗抗抗抗抗抗抗抗抗抗抗抗抗冲击性产生重大影响。这项工作旨在从热力学和燃烧角度检查EGR和空气稀释的独特特征。应用周期仿真工具和来自单缸测试发动机的实验数据的组合来证明稀释性性质对基本级别的影响，并说明从理想化行为和特定于开发的燃烧系统开发的实际考虑的脱落点燃天然气发动机。

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