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Ethane Methane Ethylene Hydrogen Critical Temp. (K) 305.32 190.56 282.35 33.15 Critical Press. (MPa) 4.872 4.592 5.042 1.296 Critical Dens. (kg/m3) 206.18 162.66 214.25 31.26 Table 2.1: Critical points of fluids important to the Ethane Simple Cycle Modeling the simple Brayton cycle in CYCLES III, pure ethane can achieve high efficiencies as shown in Figure 2.8 for a range of turbine inlet temperatures. 46 45 44 43 42 41 40 400 450 500 550 600 Turbine Inlet Temperature (oC) Figure 2.8: The efficiency of the pure ethane simple cycle The simplicity of the cycle, high efficiency, and the easy availability of ethane made this concept very appealing. In a real system, some of the ethane must dissociate, but if the critical point was not impacted too greatly high efficiencies might still be achievable. Ethane/methane mixtures were used in CYCLES III to model the behavior of the simple cycle under different dissociation conditions since the real dissociation effects are not well known. Ethylene was not included because the REFPROP data for ethylene only extends to a temperature of 450 K. The critical point of ethylene is not as damaging to the cycle as that of methane is, so the use of methane impurities only should still give a good assessment of how dissociation affects cycle efficiency. Hydrogen is not expected to appear in large portions, but the critical point of hydrogen is so low that its presence will be very detrimental to cycle efficiency. Figure 2.9 35 Cycle Efficiency (%)PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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