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391 (c) If the low-pressure compressor inlet pressure is 6 atm, what are the intercooler and reheater gas pressures? (d) Calculate the total compressor work, and compare with the work for a single compressor with 85% efficiency without intercooling. (e) What is the gas turbine net work? (f) What is the total external heat addition? (g) How much heat is available from the precooler for district heating? (h) What is the plant thermal efficiency? (i) What is the plant energy utilization factor if 80% of the precooler heat rejection is used for district heating? ( j) If the turbine delivers 100 MW of power, what is the air flow rate and (k) the rate of consumption of coal in kilograms per second (25,000 kJ/kg heating value and 90% combustion efficiency)? 9.13 Starting with the selected combined-cycle design for Example 9.1, consider a modification to the heat-recovery steam generator that allows saturated liquid water at state 12 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 dictates the mass flow rate extracted, with the balance of the water going as steam to the steam turbine. Calculate and tabulate the heat supplied per unit of gas turbine mass flow as a function of the process liquid mass fraction of the total water flow entering the steam generator. Also calculate and plot the energy utilization factor as a function of the process mass fraction. If the gas turbine power output is 6 MW, what is the maximum saturated-liquid-water process heat transfer rate? 9.14* Starting with the selected combined-cycle design for Example 9.1, consider 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 dictates the mass flow rate extracted, with the balance of the steam created 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. Also calculate and plot the energy utilization factor as a function of the process mass fraction. If the gas turbine power output is 6 MW, what is the maximum superheated- steam process heat transfer rate? 9.15 Extend the analysis of Table 9.1 to include supplemental firing of the HRSG, to provide an inlet gas temperature of 1500°F and a steam turbine throttle temperature of 1000°F. Determine the influence of boiling temperature on the pinchpoint temperature difference, and on the net work per pound of gas turbine flow; and compare the combined-cycle thermal efficiency with the efficiencies of the individual cycles. Discuss the results of the analysis. 9.16 Extend the analysis of Table 9.1, to consider a modification of the heat- recovery steam generator that allows saturated water vapor at state 13 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 toPDF Image | Advanced Systems Steam Power Plant
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