【作者】

Kento Mayuzumi

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC大会上发表，论文的版权归CIMAC所有。Mitsui Engineering & Co., Ltd. (MES) has developed a large size lean-burn gas engine MD36G jointly with DAIHATSU DIESEL MFG. CO., Ltd. (DAIHATSU). The base engine of MD36G is the medium-speed diesel engine DAIHATSU DK-36 which has a large number of records and experiences in both land and marine engines. Power output range of MD36G is 3 to 7 MW and put on the market from April 2008. Ignition system of MD36G is direct-injection micro pilot to the cylinder which is the significant feature of this gas engine. MD36G (6cylinder) as a power generation facility in MES has been working well and its reliability has been confirmed by operation more than 20,000 hours. To achieve higher generating efficiency we have improved gas engine (MD36G) itself and added heat recovery technology to the gas engine system. As one of the improvements of the gas engine itself we optimized the method of direct-injection micro pilot. This optimized method can increase combustion speed of the pre-mixture and generating efficiency of the gas engine will be increased. The most attractive point of this method is to suppress NOx increase in the exhaust gas and avoid abnormal combustion in cylinder together with increase generating efficiency of the gas engine. As a heat recovery technology, THS (Turbo Hydraulic System) and VPC (Variable Phase Cycle) system have been added to the gas engine system. THS can take the power from excess energy of Turbo Charger by converting it to hydraulic pressure. VPC system can take the power from low temperature exhaust gas after Turbo Charger which is not used before. THS can also assist Turbo Charger rotation and thereby the gas engine can respond more quickly against load fluctuation than before. We completed evaluation of these performance and reliability by the demonstrating test. It is confirmed that generating efficiency of the MD36G itself reaches 48.8 % in V-type and 47.8 % in L-type. Moreover especially for the customers who have demand mainly for electric power, generating efficiency will be improved further by adding THS and VPC to the MD36G gas engine system.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

2

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