Chemical Process Design and Integration. Robin Smith. Chapter 23 Exercise 8

8. A gas turbine has the following performance data. Electricity output 13.5 MW Heat rate 10,810 kJ-kWh- Exhaust flow 179,800 kg.h- Exhaust temperature 480C The exhaust is to be used to generate steam in an unfired HRSG with a minimum stack temperature of 140C. The specific heat capacity of the exhaust is 1.1 kJ kg-1.K-I. Enthalpy data for steam are given in Table 23.12. Calculate the following Table 23.12 Enthalpy data for Exercise 8. Enthalpy at 10 bara (kJ kg-) Steam at 200C Saturated steam Saturated condensate Water at 100C 2827 2776 762 420 a. fuel requirement in MW b. power generation efficiency of the turbine c. amount of steam at 10 bara and 200C that can be produced from boiler feedwater at 100C in an unfired HRSG. Assume a ATmin = 40C for the heat recovery steam generator. =