Effect Of Mixtures On Compressor And Cooler In Supercritical Carbon Dioxide Cycles

With the increasing demand for electric power, thedevelopment of new power generation technologies is gaining increased attention. The supercritical carbon dioxide(S-CO2) cycle is one such technology, which has relativelyhigh efficiency, compactness, and potentially could providecomplete carbon capture. The S-CO2 cycle technology isadaptable for almost all of the existing heat sources such assolar, geothermal, fossil, nuclear power plants, and wasteheat recovery systems. However, it is known that, optimal combinations of: operating conditions, equipment,working fluid, and cycle layout determine the maximumachievable efficiency of a cycle. Within an S-CO2 cyclethe compression device is of critical importance as it isoperating near the critical point of CO2. However, nearthe critical point, the thermo-physical properties of CO2are highly sensitive to changes of pressure and temperature. Therefore, the conditions of CO2 at the compressorinlet are critical in the design of such cycles. Also, theimpurity species diluted within the S-CO2 will cause deviation from an ideal S-CO2 cycle as these impurities willchange the thermodynamic properties of the working fluid.Accordingly the current work examines the effects of different impurity compositions, considering binary mixturesof CO2 and: He, CO, O2, N2, H2, CH4, or H2S; on variousS-CO2 cycle components. The second part of the studyfocuses on the calculation of the basic cycles and component efficiencies. The results of this study will provideguidance and defines the optimal composition of mixturesfor compressors and coolers