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shows the effects of methane concentration on the ethane cycle operating with a turbine inlet temperature of 470 oC. This turbine inlet temperature was chosen because the applicable range of methane data in REFPROP is also limited by temperature. 42 41 40 39 38 37 36 0 5 10 15 20 Methane Content (mole %) Figure 2.9: The effect of dissociation on the ethane cycle After a methane concentration of 20 % by mole, the efficiency loss is approximately linear with methane percentage. Equilibrium concentrations of ethane at the high temperatures of the cycle are less than 60 %. At the expected level of dissociation, the simple ethane cycle fails to perform beyond the efficiencies achieved in current LWRs. As mentioned in Chapter 1, other simple gas cycles running on helium have achieved very high efficiencies. Unless experiments show that dissociation does not occur nearly to the predicted levels or that recombination mitigates reverses the process at low temperature, the ethane simple cycle cannot be viable for economic power conversion systems. Also, the flammability of ethane and methane introduces problems for safety. 2.4 Fluid Impurities in the S-CO2 Recompression Cycle The performance of the recompression cycle is attractive because the main compressor operates just above the critical point, reducing compressor work a great deal. The critical point of CO2 is at 7.377 MPa and 30.98 oC. The low dissociation and low corrosion rates of CO2, and temperature of commonly available cooling water mean that CO2 is a good choice for working fluid. Inevitably present impurities in the fluid will change the critical point. Compressor work will rise if the critical point is lowered from that of pure CO2 as the compressor inlet conditions become further from the critical point. Cooling water puts a lower limit on the temperature of 36 Cycle Efficiency (%)PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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