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Supercritical Carbon Dioxide Circulated EGS Combined with IGCC in New Mexico 3.7.4.2 Brayton Open Cycle Super-Critical CO2 Turbine As the scCO2 flows from the gravity separator it flows towards the Brayton cycle turbine. This turbine is a high efficiency turbine that is designed to operate with super-critical carbon dioxide as the working fluid. Recent work by Sandia National Lab (2011) suggests that this turbine will be capable of performing within the prevailing conditions of the system at the site with substantial benefits such as the ability to remove the compressor and combustion sources from the system because the scCO2 exits the reservoir preheated and at elevated pressures and after water separation arrives at the Brayton turbine ready for power generation. Compared to other gas turbines the scCO2 turbine could increase the electrical power produced per unit of fuel by 40 percent or more (Wright et al. 2010). The classical brayton cycle turbine undergoes four processes. These are an isentropic compression, a constant heat addition, isentropic expansion, and a constant heat rejection (Wright et al. 2010) (See Figure 27). All four of these processes occur at steady state flow. Only two of these processes are of interest for this project. These are the isentropic expansion and the constant heat rejection. For the system proposed here the isentropic expansion will occur under a pressure decrease from 3000psia to near the critical point at 1200 psia. The heat rejection phase will occur from 200 to 40oC. A rough estimate of energy production can be accomplished by up scaling the results presented by Wright et al. 2010. The turbine that was presented in their report produced approximately 53KW at a flow rate of 3.5 kg/s and a pressure ratio of 1.8. If a flow rate of 1000 kg/s scCO2 is considered with similar pressure ratios then a rough power production of 15MW could be expected. In addition to this power an additional from the heat rejection from the turbine would result in approximately 100 MW if there is a conversion efficiency of 50%. A similar binary power plant would alone be able to capture the 100MW of power while leaving the additional 15MW of power lost and then only if approximately 1800 psia was lost prior to the heat exchanger to allow the pipes within the heat exchanger to be of similar size as those after the turbine. A brayton cycle engine has not been applied to scCO2 associated with geothermal resources as of yet but in the opinion of the author of this section, a serious design concern for the turbine is the mass flow rate of scCO2over the lifetime of the reservoir. The size of the turbine will be based on the mass flow rate of scCO2. During initial times it is expected that the flow rate of scCO2 will be less than flow rates at later times. This may require a low mass flow turbine as well as a high mass flow turbine to efficiently generate power. Penn State University | 3.7 Geothermal Energy Conversion Systems 51PDF Image | GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY
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