特集―燃焼による発電
省エネルギー・環境対応 新型ガスエンジンの開発
キーワード:
Gas Engine,
Micro-Pilot Ignition,
Spark Ignition,
Natural gas,
Coal Mine Methane,
Customer need
2011 年 53 巻 166 号 p. 222-229
詳細
2011 年 53 巻 166 号 p. 222-229
Mitsubishi Heavy Industries, Ltd. (MHI) has developed and added the new KU30GSI and CM (Central Mixing)-MACH models to its lineup of KU gas series engines. The KU30GA gas engine, formerly the Micro Pilot Ignition (MP) -type model, has delivery of more than 150 units since 2001. The experience and know-how accumulated from their on-going operations have been fed back into the development process to ensure even higher reliability and performance.
The KU30GSI, whose ignition concept has been modified to a Spark Ignition (SI) system, was developed in order to meet the demand for a simple gas engine that does not require liquid pilot fuel and an engine with improved energy utilization efficiency. The KU30GSI has optimized its exhaust temperature and consequently reached a total efficiency of 66% - combined with generation efficiency and steam efficiency, the world's highest for this class of engine. Moreover, the KU30GSI start-up time has been reduced to less than 7 minutes from activation to 100% loading, meeting the requirements for peak application. Intricate details combining optimum control and the diagnosis techniques for combustion greatly contribute to this performance achievement.
Further, the concept of CM-MACH (MP-type) was developed to expand the utilization of low calorie gases and other specialty gases as operational fuel. With the CM-MACH, low calorie gas has been achieved by means of gas supply features in both the intake port at each cylinder and the suction port before the turbocharger. This feature offers an additional safety advantage in that it keeps an appropriate concentration of air-fuel mixture in the intake system to prevent auto ignition. MHI believes that through our expanded lineup of KU gas engines, we are able to meet an unprecedented diversity of customer needs.
