Turbocharger developed for Tier III two-strokes
MAN Diesel & Turbo says that it is developing a new turbocharger series specifically matched to the requirements of two-stroke engines.
The design and optimisation for the new TCT series is intended to fulfil the requirements of IMO Tier III emission limits. Compared to the TCA turbocharger range, the TCT will see an increase in efficiency of about 5%, through using revised compressor and turbine-wheel geometry, which the company says will increase potential for waste heat recovery by 30%. MAN says that the TCT range will deliver a 10% greater air flow at a turbocharging pressure 25% higher, while being 30% smaller and 40% lighter than the equivalent TCA unit. The TCT turbocharger is undergoing an extensive validation and field-testing programme, and the first example is expected to reach the market in 2016.
Dirk Balthasar, head of sales and promotion for the MAN Diesel & Turbo turbocharger business unit said: “Modern turbochargers must meet many demands, including meeting technical requirements – such as Tier III compliance – at the most competitive price, having small dimensions to facilitate installation in cramped spaces, not to mention characteristics such as high operational reliability, low maintenance frequencies and a long working life. The conflict of objectives is obvious. In developing the TCT range, it was important to MAN Diesel & Turbo to balance the individual demands of the different groups of customers to achieve an optimum overall result. Ultimately, we feel we have achieved this and believe the TCT range to be the best overall turbocharger package for two-stroke engines.”
MAN Diesel & Turbo believes that it will be possible to cover a wider range of engine ratings with the TCT, and that engine builders will be able to use just one size for turbocharging different numbers of cylinders. The company says that individual adaptation of the turbocharger to the engine will follow the established method of using a variety of exchangeable parts within the turbocharger, while TCT production costs can be controlled by dispensing with the alternatives required for four-stroke engines. Tier III two-stroke engines in which exhaust gas recirculation is employed to meet NOx limits will require wide compressor maps to cover different EGR flow rates. For this purpose, MAN intends to develop specific compressor wheel geometries with wide compressor maps.
The company claims that the TCT will provide shipowners and installation operators with significant advantages. Benefits of the TCA range, including patented Super-Bolt compressor wheel mounting to save maintenance time, will be retained. The life of expendable parts will be extended by using high-performance components, enabling reduced frequency of servicing. In line with established MAN maintenance philosophy, servicing can be undertaken either by the operator or by the company’s service division, MAN PrimeServ.
Meanwhile, MAN Diesel & Turbo has signed a new license agreement with QMD, a member of the CSIC Group together with Dalian Marine Diesel and Yichang Marine Diesel. QMD thus becomes MAN’s 12th Chinese licensee. Klaus Engberg, senior vice president and head of MAN Diesel & Turbo two-stroke licensing said: “We now have a greater geographical reach in this important market and are better able to reach customers in this part of China. For over 30 years, we have had a successful license agreement with CSIC, which QMD belongs to, and we look forward to an equally fruitful cooperation with our new licensee.”
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