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Session: Turbo expanders II
Session starts: Tuesday 08 October, 14:00
Presentation starts: 14:20
Room: Van Weelde Zaal

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Jos van Buijtenen (Triogen B.V.)
Quirijn Eppinga (Triogen B.V.)
Stefano Ganassin (Triogen B.V.)

Abstract:
A novel Organic Rankine Cycle (ORC) plant has been developed by Triogen B.V. of The Netherlands. The ORC system is based on a high temperature resistant hydro-carbon as a working fluid, hence suitable for direct use of intermediate temperature heat sources from 350 °C and above. The core of the unit consists of a combined turbine – generator – pump: the High Speed Turbo-Generator (HTG). Thanks to the use of a high speed generator (25.000 rpm), the turbine and pump could be laid out at their optimum specific speed, leading to high internal efficiencies. Moreover, this concept allowed for a seal-less design: there are no shaft seals necessary, and the only connections between the internals and the outside world are flanged connections for the working fluid to enter and exit the HTG and the well-insulated electric cables. Lubrication of bearings and cooling of the generator is taken care of by the working fluid itself, so there is no need for lub-oil and subsequent system. Therefore the unit can be considered to be completely hermetic. Twenty units are now in commercial operation in different applications, while there are more than 10 units on order. Heat sources vary from exhaust gasses of gas- and diesel engines to landfill gas combustion and wood firing as well as industrial waste heat. This paper will report on the current operating experience (more than 200.000 accumulated hours). Moreover, the unique features of the design, such as the hermetically closed turbo-generator, the cycle design and the balance of plant will be highlighted in view of the applications. Units are being built as a standard package for 90 to 165 kWe, being adapted to the heat source by sizing the evaporator.