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Supercritical Carbon Dioxide Circulated EGS Combined with IGCC in New Mexico composition was taken from the Cost and Performance Baseline for Fossil Energy Plants (Haselbeck 2010). Gasification efficiency is calculated using the cold gas efficiency method. This is calculated by dividing the lower heating value of the synthesis gas by the higher heating value in the coal (McDaniel 2002). Each parameter study varied one component of the gasifier‘s reactant feed while holding the others constant. Cases one and two were set to observe the influences of oxygen and water respectively. For case one the equivalence ratio was varied and the default water to fuel ratio in the fuel stream of 63% remained constant. For case two the default equivalence ratio was held at a constant value of three, while the water to fuel ratio was varied. 4.3.3 Results The results of each parameter study are presented in four plots. Each plot displays the influence of a parameter on the hydrogen and carbon containing species which are dominant in the synthesis gas. In case one, the first parametric study was designed to test the sensitivity of higher heating value chemicals to fluctuations in the equivalence ratio. As the equivalence was varied the following trends were observed. 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 CO CO2 12345 Equivalence Ratio Figure 36: Equivalence Ratio vs. Equilibrium Mole Fraction The trends in Figure 36 follows the same equilibrium trends observed with fuel rich conditions in a typical combustion reactor. As the fuel rich conditions increased, so does the mole fraction of carbon monoxide. However, in a gasification reactor carbon monoxide is not a pollutant but a desired product. Figure 36 shows these increases in production with the decreasing oxygen concentration. As an entrained flow gasifier operates at higher temperatures, this typically implies lower equivalence ratios. Therefore, this explains the lower cold gas efficiencies reported when compared to the lower equivalence ratios of moving bed reactors. What this graph does not Penn State University | 4.3 Gasifier 62 Equilibrium Mole FractionPDF Image | GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY
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