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Supercritical Carbon Dioxide Circulated EGS Combined with IGCC in New Mexico In this EGS system, although elevated temperatures are present, increases of pH and laminar regime cannot occur, which are essential to the creation of the protective layer. Hence, another inhibition method is required to match the operational conditions found at the site. One such method is the use of austenitic grades of stainless steel. These steels were developed for use in both mild and harsh, corrosive environments. They are a chromium-nickel alloy. The name austenitic is derived from the type of crystal structure from which it is comprised. 304 stainless (18% Cr – 8% Ni) is the basic material and is used more than any other stainless steel. Because of their chromium content, austenitic stainless steels form a passive film to provide protection against corrosion. The addition of nickel stabilizes the austenitic crystal structure and interacts with chromium to maintain the passive film. The material is non-magnetic. There are many grades of austenitic stainless steels which are alloyed for various applications. Thus, the material of construction for piping system is suggested to contain a high percent of Chromium and Nickel for the prevention of CO2 corrosion. 3.7 Geothermal Energy Conversion Systems 3.7.1 Introduction: The geothermal resource at the selected site is at the cusp of either a binary or a double flash energy conversion system if the working fluid was only water. The expected pressures and temperatures within the reservoir are firmly within the liquid phase envelope of water (See Figure 22). However, the expected pressures and temperatures within the reservoir are firmly within the supercritical region of carbon dioxide (See Figure 23). In addition to the phase behavior of the water and carbon dioxide mixture, its corrosive nature must be accounted for within any conversion system due to lifespan concerns. This suggests that there are two general solutions, either the geofluid is used as is or it goes through a separation process that creates a scCO2 stream and a water stream. For either fluid there is a limit on the amount of energy that can be recovered. This maximum value for complete energy conversion is described by thermodynamics. A calculation similar to Dagdan (2007) shows that for a flow rate of 180 kg/s of water will result in approximately 150MW of power. The same flow rate for scCO2 will result in approximately 30MW. If the flow rate of 1000 kg/s as proposed for the circulation rate for this project the resulting power is 834MW for water and 164 MW for scCO2. The difference between the two conditions may not seem significant but the opportunity to realize an additional 14MW (scCO2; 1000kg/s versus water; 180kg/s) of power is similar to a capacity increase of nearly 10% in a turbine. Penn State University | 3.7 Geothermal Energy Conversion Systems 39PDF Image | GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY
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