【作者】

Yoshihisa Ono

【摘要】

论文已在中国上海举行的2013年CIMAC大会上发表，论文的版权归CIMAC所有。Due to recent increases in fuel prices, many ship owners are seeking reductions in operating costs, with particular emphasis on lowering fuel consumption. Furthermore, for the sake of environmental preservation, international societies have been moving to tighten regulations on marine emissions of greenhouse gases and NOx, with Tier ll NOx regulations for ships having been implemented in 2011 and Tier 111 regulations coming into force in 2016. Also, a CO2 emissions index (energy efficiency design index, or EEDI) will be applied to vessels built from 2013 onward, and CO2 emissions regulations based on this index will be become mandatory. Given that turbochargers used for diesel engines have a substantial influence on the combustion of fuel, they can play a major role in addressing the above-mentioned issues. Of particular note in this context is the fact that low load operation has come to be utilized in recent years in order to reduce fuel consumption by ships. The author of the present report, being associated with a turbocharger manufacturer, is of the opinion that the application of several new turbocharger technologies will be contributed to improved performance by ships under low load operating conditions, in the form of turbochargers specifically intended for these requirements. This paper introduces technological efforts aimed at improved turbocharger performance un-der low load conditions, incorporated into the newest MET-MB series of high efficiency turbochargers by Mitsubishi Heavy Industries (MHI). Also presented, MHI has developed a new type of variable nozzle structure. The proprietary MHI approach, known as the Variable Turbine Inlet(VTI), has been introduced not only for newly manufactured turbochargers, but also as a retrofit option for turbochargers in current service. MET-VTI turbocharger is aimed at reduced fuel consumption at low load for marine diesel engines. In order to actively increase the amount of air in the low load operation, this MET-VTI was increased turbine output by means of reducing the geometry turbine area, thus enabling higher turbocharger rpm. In addition, in the wake of the world's first practical application in 2011 of a turbocharger equipped with a high speed generator (hybrid turbocharger), discussion is presented on the current state of efforts related to new hybrid turbochargers equipped with motor on the rotor shaft, enabling motoring assist aimed at meeting low load operation requirements.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

1

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