【作者】

Silvio Risse，Klaus Buchmann

【摘要】

论文已在上海2013年CIMAC大会上发表，论文版权归CIMAC所有。 KBB faces up to the challenges of IMO Tier lI with the ST27 range of radial turbine type turbochargers. Since their launch, the ST27 turbochargers have been well-accepted on the market. This paper includes a brief report on field experience. Marine and large genset engines will not be able to meet the consistently increasing performance requirements with due consideration of the worldwide emission regulations in future through internal engine measures alone (moderate Miller cycle timing, for example). Apart from exhaust gas recirculation (EGR) and exhaust gas after-treatment by selective catalytic reduction (SCR), two-stage turbocharging with intermediate cooling is regarded as a particularly promising way to reduce both consumption and emissions (in particular of NOx nitrogen oxides). The target in terms of the charging pressures is presently between 6 and10 bar. KBB is developing new low-pressure and high-pressure turbochargers to meet this emerging challenge. The paper describes the concept behind the new turbocharger series. Apart from the performance targets, it addresses in particular the high demands in terms of sealing, minimizing blow-by and dimensioning the high-pressure stage. In 2012, KBB built the first prototypes of the new generation of turbochargers which are presently undergoing tests. The paper also reports on the test results achieved on a hot-gas test stand and in initial engine tests. Further-more, the paper covers the increasing requirements in terms of designing (CAE) and matching (1D engine simulation with GT-power) the high-pressure and low-pressure stages. It takes into account the multitude of potential two-stage boost and control concepts for modern large engines operated with gas, diesel and heavy fuel oil and provides corresponding examples. Specially designed EGR turbochargers are required for high-pressure exhaust gas recirculation. The paper addresses the distinctive features of such turbomachines and presents an approach to the design of prototypes ready for series production.

【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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