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ACCEPTED MANUSCRIPT ability of closed gas cycle to burn various coal grades and other low qual- ity fuels represents a distinctive feature in comparison with open cycle gas turbines. With reference to a supercritical LNG vaporization the heat rejec- tion mode of a closed gas cycle matches almost perfectly with the LNG heat absorption law. This character is almost unique and makes the gas cycle a privileged conversion system. As it is clear from Figure 1.a and 1.b, in contrast with the ORC cy- cle behaviour, the closed gas cycle is capable of heating the LNG up to the ambient temperature thus exploiting the entire cooling capability of the liq- uefied natural gas. Condensing cycles can reach a similar target only with a complex configuration featuring a plurality of condensation levels. As a consequence a typical Specific Power Performance Parameter (SP P ) defined as the power output to the LNG mass rate ratio, (MW/(kg/s)) reaches for the closed gas cycles unrivalled values. All the assumptions made to evaluate the performance of closed gas (ni- trogen) cycles are given in Table 1. System efficiency and parameter SP P for super- and sub-critical LNG are given in Figure 2a and 2b respectively at various compressor pressure ratio and turbine inlet temperatures. For supercritical LNG at 700 ◦C optimum efficiency is 50.7 % (SPP= 0.85 MW/(kg/s)) i.e. slightly better than that of steam/ORC binary cycle at 550 ◦C (η = 0.523). At 800 ◦C η = 0.543, SPP 11 peer-00573462, version 1 - 4 Mar 2011PDF Image | Class Action Information Notice Ormat Technologies
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