Q4. A steam power plant using a reheat cycle is shown in Fig Q4.
Steam enters the High-Pressure Turbine at a pressure and temperature of 60 bar and 540°C respectively and expands with an isentropic efficiency of 87% to a pressure of 5 bar.
It is then reheated at constant pressure to a temperature of 470°C.
The Low-Pressure Turbine expands the steam to a pressure of 0.05 bar, the increase in specific entropy during this process is 0.3 kJ/kg K.
The feed water leaves the condenser at a temperature of 27°C.
Under these conditions the plant produces a power output of 80 MW.
The feed pump work cannot be ignored.
(a) Draw the expansion and reheat process on Worksheet Q4. (5)
(b) Using Worksheet Q4, determine EACH of the following:
(i) the isentropic efficiency of the low-pressure turbine; (2)
(ii) the mass flow rate of steam in tonne per hour; (5)
(iii) the cycle thermal efficiency.
Please buy a membership plan and login via our app to view answers.
Download our App
