The Potential of Exhaust Gas Recirculation in Large Gas Engines
In the future, emission regulations for large gas engines will be more stringent. According to IED the EU has set a NOx limit of 200 mg/mn3 for large stationary gas engines. In certain countries and regions, limits under 100 mg/mn3 are even required. Without exhaust gas aftertreatment, these emission limits can hardly be met using conventional lean burn concepts. Possible additional strategies are the further enleanment through substantially improved ignition systems and pre-chamber concepts or exhaust gas recirculation. This article focuses on the application of exhaust gas recirculation. For a long time, exhaust gas recirculation has been a reliable method for reducing the emissions of diesel engines in passenger cars and heavy-duty vehicles. Consequently, the paper first presents the basic effects of exhaust gas recirculation in gas engines as compared to diesel engines based on simulation results. Next, three different EGR concepts are evaluated: lambda 1 operation, lean burn engine with moderate EGR use and the HCCI process. The concepts examined offer additional challenges in terms of reliable ignition systems, obtainable ignition delay, combustion stability and component stress. Based on simulation calculations and measurements from a single-cylinder research engine, statements are made about the values obtained for power output, efficiency, and emissions. Finally, the achievable efficiencies are analyzed using a detailed breakdown of individual losses relative to the ideal engine. Significant differences between each concept and advanced lean burn operation are shown.
Andreas Wimmer Gerhard Pirker Jan Zelenka Franz Chmela James Zurlo Christian Trapp
Graz University of Technology - Large Engines Competence Center,Austria GE Gas Engines,USA
国际会议
上海
英文
1-10
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）