Large Gas Engines - 75 mg/Nm3 @ 15%O2 NOx Engine-Internal Measures or Exhaust Aftertreatment?’
Large gas engines are gaining more and more importance within the global energy mix. The long-term availability of natural gas is comparatively secure and gas engine power plants are reaching high efficiency levels while meeting stringent emission limits worldwide as well as customer needs for matching electricity generation with demand. This makes large gas engines a clean technology for supplying electricity and heat around the globe as part of a decentralized energy concept. Emission legislation always drives technology, and there is a clear trend towards decreasing the emission limits for large combustion plants. For example, the European Union has issued the Industrial Emission Directive (IED) with a NOx limit for new gas engine plants of 75 mg/Nm3 @ 15% O2 and 100 mg/Nm3 for CO. These limits have been in force since 2011 and are mandatory for power plants with an energy input above 50 MW that consist of engines above 15 MW. Due to the IED and other emission legislation, it is necessary to decrease plant emissions. As a result, customers are requesting engines with lower NOx, CO and THC emissions. Up to date engines with 500 mg/Nm3 NOx @5% O2 dominate the market share, but it is likely that there will be a shift to low NOx engines. From the perspective of both technology and life cycle cost, there is always the question of what technology fits best. Consequently, this paper discusses the trade-off between emissions and engine performance and also highlights various technological approaches which are used to achieve the highest engine efficiency with the lowest possible engine-out emissions. The focus is on the design of the prechamber and the main combustion chamber, operational strategy and the turbocharging system including gas exchange. Finally, the engine-internal measures are compared with competing exhaust aftertreatment solutions.
G. Tinschmann A. Birgel C. Trapp E. Schnessl C. Redtenbacher A. Wimmer
GmbH Co OG,Austria Graz University of Technology - Large Engine Competence Center,Austria
国际会议
上海
英文
1-11
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）