【作者】

Andreas Banck

【摘要】

该论文已在芬兰赫尔辛基举行的第28届CIMAC大会上发表。论文的版权归CIMAC所有。Caterpillar develops medium speed Dual fuel engines for marine applications in the power range from 2.400 to 15.440 kW. Due to new emission legislation like IMO3 in MARPOL Annex VI, customers are looking for alternative solutions for propulsion and power generation, which are able to operate like the well- known Diesel engines. The M46DF and M34DF Caterpillar Dual Fuel engines – also offered under the MaK trademark – are able to burn Natural gas ( LNG) and liquid fuels like Diesel, HFO or Crude oil. IMO3 emission limits are fulfilled with in gas operation and for liquid fuels an exhaust gas aftertreatment solution (SCR) is offered. Transient response is a key requirement for a lot of marine applications and these are not only emergency gensets with three step block loading. Supply vessels operate in a majority of time on low stand by power and require fast ramp up to high level of thrust. Even with Diesel engines this demands additional features like air injection into the charge air manifold. Gas engines are known to be slow in load response. This is mainly caused by air fuel ratio control depending on turbocharger inertia. Gas ignition is limited by upper and lower air fuel ratio limit, which leads to reduced rates in fuel ramp up. A faster speed governor would overfuel the combustion chamber. A Diesel engine would react with black smoke, but a gas engine would break down due to a mixture which is too rich. The M46DF and M34DF engines are equipped with a superior engine control. All controls are handled in a MIMOcontrol architecture. One speed governor controls three fuel systems (main Diesel fuel, ignition Diesel fuel and Gas admission). Due to this concept the load acceptance of Dual Fuel is on a level, which may be called “It runs like a Diesel”. This paper describes the engine concept and will show engine test results. A second aspect is the low load operation in Gas mode. Without additional technologies common gas engines run with a very lean mixture and emit increased amount of hydrocarbons. New technologies have been developed to allow unlimited engine operation with gas combustion. This paper describes the engine concept and will show engine test results of an IMO3- Dual Fuel engine optimized for marine applications with class leading load acceptance and low load operation.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

7

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