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392 the steam turbine. Calculate and tabulate the process heat supplied per unit of gas turbine mass flow as a function of the process water mass fraction of the water flow through the steam generator. Also calculate and plot the energy utilization factor as a function of the process mass fraction. It the total power output of the combined cycle is 6 MW, what is the maximum process heat transfer rate? 9.17 Extend Exercise 9.15 to consider a modification of the heat-recovery steam generator that allows superheated steam at state 8 to be extracted for industrial process use. Assume that the water is returned to the condenser as a saturated liquid at the condensing temperature. Assume that process use of the steam has priority, with the balance of the steam going to the steam turbine. Calculate and tabulate the process heat supplied per unit of gas turbine mass flow as a function of the process steam mass fraction of the water flow through the steam generator for a boiling temperature of 600°F. Also calculate and plot the energy utilization factor as a function of process mass fraction. If the total power output of the combined cycle is 20 MW with no process heat, what is the maximum process heat transfer rate? 9.18 Design an open-cycle regenerative gas turbine cogeneration system in which a fraction of the turbine exhaust gas can bypass the heat exchanger for process use. Prepare a report stating your design criteria, defining your analysis methodology, and presenting performance data for the nominal design condition that you selected. 9.19 Perform the design required in Exercise 9.18, and include consideration of performance for a range of off-design process heat transfer requirements that are lower than the design value. 9.20 A 20-MW electric motor in a simple compressed-air-storage plant drives a compressor with a pressure ratio of 10 and an efficiency of 85% for six hours nightly. What power output can be obtained with a turbine inlet temperature of 1600°F if the plant operates for four hours during the day at constant power output? The turbine efficiency is 90%. What is the air-fuel ratio if methane is the fuel used? What is the net generation efficiency, considering only the fuel consumption of the turbine? Assume a daily cycle, that cavern pressure changes are negligible, and that the heat of compression is dissipated before generation begins. 9.21* An ideal steam turbine operates with 1000°F, 2000-psia throttle, and 1-psia condenser and produces 15 MW without extraction. When steam is extracted for process use at 500 psia, after use it is condensed to a saturated liquid at that pressure and throttled to the condenser. Tabulate and plot the process heating rate and the EUF as a function of extraction mass fraction. 9.22* A 25 MW steam turbine operates in 1000°F and 2000 psia with an efficiency of 87%. Eighty percent of the condenser heat transfer is used for an industrial process. Tabulate and plot the process heating rate and the EUF as a function of condenser pressure between 1 psia and 2 atmospheres.PDF Image | Advanced Systems Steam Power Plant
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