New turbochargers for modern large engines with low emissions and high performance
KBB faces up to the challenges of IMO Tier II 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 and 10 bar. KBB is developing new low-pressure and highpressure 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 hotgas test stand and in initial engine tests. Furthermore, the paper covers the increasing requirements in terms of designing (CAE) and matching (1D engine simulation with GTpower) the high-pressure and lowpressure 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.
Silvio Risse Klaus Buchmann
Kompressorenbau Bannewitz GmbH,Deutschland
国际会议
上海
英文
1-9
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）