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Supercritical Carbon Dioxide Circulated EGS Combined with IGCC in New Mexico 4.5 Power Generation 4.5.1 Introduction In IGCC- Integrated Gasification Combined Cycle where Combined Cycle refers to 2 turbine cycles: Brayton Cycle gas turbines, and Rankine Cycle steam turbines. In a defined IGCC system hydrogen is produced from the gasification of coal, cleaned-up through various processes, and then is sent to a gas turbine for combustion. The combustion of the hydrogen with oxygen will yield water in the form of steam. This gas turbine, model S109H, effluent steam, at a pressure of 2400 psig and 565 °C, is then fed into the first of a series of three steam turbines, termed high pressure steam turbine (HPST) (Matta, Mercer, & Tuthill, 2000) . The effluent from the HPST is then fed into the heat recovery steam generator (HRSG) unit. This HRSG unit has 3 levels of steam admission, one for each of the three steam turbines: High Pressure, Intermediate Pressure, and Low Pressure. The relative HRSG pressures and temperatures of said turbine admissions is 300-400psig, 538-566°C; 300-400psig, 11°C; and 40psig, 11°C (Matta, Mercer, & Tuthill, 2000). A material limitation of the gas turbine combustion chambers limits firing temperature to 1700 Kelvin. To achieve this in practice, the oxy-combustion of hydrogen is diluted with nitrogen or steam. The research analyzed in this report determines the stoichiometric nitrogen requirement to achieve optimum heat flow, 52,000,000 KJ/min, at the gas turbine‘s maximum firing temperature, and subsequently the qualitative relation to NOx emissions from the brayton cycle turbine (GE Energy, 2009). 4.5.2 Methods Although Figure 46 shows that steam is more effective at diluting flame temperatures, Nitrogen was selected for this project due to the fact that in the arid region of New Mexico, which was selected as the site for this plant; water should be used sparingly as it is a precious commodity. The nitrogen stream in this plant is obtained from the Air Separation Unit (ASU), which separates air into its component oxygen and nitrogen. Penn State University | 4.5 Power Generation 74PDF Image | GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY
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