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ACCEPTED MANUSCRIPT ◦C to the cryogenic LNG temperatures. In this way reheating of partially expanded steam becomes unnecessary since the steam quality at the end of the expansion is sufficiently high (above 0.92 at 150 bar and 550 ◦C turbine inlet conditions). Cycle configuration, steam parameters and component per- formance were stipulated in agreement with a plant capacity in the range of 50–80 MWe and are reported in Table 1. Rankine cycle data were taken from existing plants of similar output. Brayton cycle parameters are consis- tent with the ORC current practice. Nirtrogen cycle data were taken from the literature, [14]. An overall efficiency of 31.7 % was calculated resorting to AspenPlus computation program. For the bottoming cycle n–butane (n − C4H10) was selected as the work- ing fluid since its critical temperature of 152.0 ◦C approximately optimizes the cycle performance. A one stage extraction was assumed for the regener- ation process. As it is typical when dealing with organics at the end of the expansion the vapour is slightly superheated which favours a good turbine efficiency. In principle a hydrocarbon with a more complex molecule such as n–pentane (n − C5H12) could be used. In this case however, at a condensa- tion temperature of -50 ◦C vapour pressure at the turbine exhaust would be impractically low (0.013 bar against 0.096 bar for n-butane). For a steam/n-butane binary plant configuration (see Figure 1.a) the computed overall efficiency, obtained by the use of the AspenPlus program, 9 peer-00573462, version 1 - 4 Mar 2011PDF Image | Class Action Information Notice Ormat Technologies
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