【作者】

Ilari Kallio

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC世界大会上发表，论文的版权归CIMAC所有。 This paper will highlight recent developments within Wärtsilä´s four-stroke engine portfolio. In recent years, Wärtsilä Engines R&D has increased focus on creating a better understanding of the main values that our marine and power generation customers require. A specific technology is worthless unless it can be connected to a customer value. A customer–centric design philosophy combined with a natural interest and passion about engine technology is fundamental in maintaining competitiveness in the market. High reliability of the product is seen as a basic qualifying criterion that justifies the product’s existence in the market. The design and operations also need to be cost efficient to enable an affordable initial cost of investment relative to the value the product offers to the market. In recent years, technology development to reduce emissions has been accelerated due to the 2016 introduction of IMO Tier III regulation for reduced nitrous oxide emissions in NECA areas and the 2015 introduction of low sulfur emissions in SECA areas. Furthermore, legislation already passed, such a EPA Tier 4 for smaller marine Category II engines, underlines the need to find solutions to reduce particulate matter emissions for diesel engines and total hydrocarbon (THC) emissions for gas engines. From a macro-economic perspective, the past decade will be remembered as a period of high volatility. Record high contracting in ship-building activity experienced during 2006 was followed by the sudden collapse of the financial markets in 2008 - resulting in an over-capacity in the world´s shipping fleets and engine building. The energy market, after a relatively long period of high energy prices, has experienced an abrupt drop in oil prices, driven largely by the exploitation of shale reserves in the USA and a complex geo-political climate. The changing energy landscape combined with new emission regulations has resulted in the emergence of new fuels such as LNG, LPG and LEG. The operational profiles of internal combustion engines has also changed, with a significant trend in certain segments towards increased operation at part loads, larger units being replaced by smaller multiple units for increased plant flexibility and increasing demand for fast load taking capability and starting. This macro-economic and market volatility impacts the development philosophy of internal combustion engines, with the key requirement being flexibility in terms of operations, fuels and product configurability. Regardless of commodity prices, fuel will continue to be a significant cost driver in the operations of all customers. There will also be a continuous need to reduce the environment footprint associated with CO2 emissions. Engine efficiency will therefore continue to play an integral role in Wärtsilä´s development activities. The paper will summarize the development methodologies and technologies identified as key enablers to meeting the previously described customer values and flexibility required in the market. The increasingly front-loaded development process will be highlighted with an increasing emphasis on virtual validation, single cylinder engines and validation rigs. Some of the key technologies including two-stage turbocharging, an innovative new twin needle common rail injection system, further improvements in variable valve timing and a new automation platform will be summarized. The paper will highlight examples of the above technologies applied to recent key product launches, such as the Wärtsilä 31, Wärtsilä 46DF, upgrades to Wärtsilä 20DF, Wärtsilä 34DF, Wärtsilä 34SG and the launch of the Auxpac 32. Emphasis is placed on connecting the technologies to specific customer values to improve the profitability of the end customer´s 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】

2

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