four-stroke engines
››› have the choice of heat exchanged, keel cooled and fan drive for radiator-cooled applications. A cast water-cooled exhaust manifold lowers surface temperatures
Anticipated demand in China for advanced medium speed engines for locomotive, marine and industrial applications stimulated the Shanghai Marine Diesel Research Institute (SMDERI) to create its new CS21 design. Development of the 210mm-bore x 320mm-stroke model was started at end-2008, targeting Chinese river, coastal and fishing vessel propulsion as well as genset drives for deepsea tonnage. “We expect that plans for emissions limitations will create a market for new engines both for new vessels and for repowering existing freighters as high as 20,000 engines per year,” reports SMDERI president Professor Dr. Jin Donghan. “Beyond this we also see great potential for gas or dual-fuel engines in power generation in this engine class. We have already achieved IMO Tier II compliance on NOx emissions and are building the potential into this engine for economical upgrading to Tier III compliance.” Suitable for operation on distillate and
to Solas levels while also improving performance; and an aft-mounted water- cooled turbocharger from Cummins Turbo Technologies is optimised for
Own-design medium speed engine from Chinese group
heavy fuel oils, the CS21 will be offered in six-to-nine in-line cylinder versions. In its present stage of development the engine yields an output of 220kW per cylinder, equating to an overall power range from 1,320kW to 1,980kW.
Among the features highlighted by Professor Jin Donghan are compactness and ease of manufacture and maintenance, with front end timing gear and modular cylinder units that enable piston and connecting rod to be withdrawn together in-situ. A price window between an older engine that the CS21 replaces and the current international price per kW was sought. An electronically-controlled common rail fuel system will deliver an injection pressure of 1,800 bar, and engine cooling will be effected by a dual-circuit system. “We are developing an engine offering high reliability, high power output, low fuel consumption and low NOx emissions at all load points,” asserts Wang Feng, director of
SMDERI’s R&D centre. “The engine employs the Miller cycle to achieve a combination of low NOx emissions and favourable fuel consumption, while also paying full attention to soot and particulates.”
Contributing to fuel economy and environmental friendliness as well as reliability and ease of maintenance, a compact high efficiency ABB turbocharger is specified to secure pressure ratios up to 5.8. SMDERI is part of the state-owned China Shipbuilding Industry Corporation (CSIC) which also owns Chongqing Jiangjin Turbo & Charger Machinery, ABB Turbocharging’s joint venture partner in ABB Jiangjin Turbo Systems. The owner of the new engine project, CSIC
Diesel Power, has several licensees primed to produce the engine in volume. “We then envisage going on to design and develop a family of larger bore engines and a dual-fuel version sharing the same basic features as the CS21,” says deputy chief engineer Professor Feng Mingzhi.
marine applications.
Production of QSB7-DM engines is due to start in mid-2012 at Cummins’ Darlington Engine Plant in the UK.
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