Chemical analysis on original basis: % C=36%, S8=12%, H2=1.5%, N2=10%, O2=20%. The supplied lignite is burned with 40% excess air in a power plant operating on a simple Rankine cycle. The steam turbine operates at a pressure of 25 MPa and a temperature of 550°C. After expanding to a condenser pressure of 20 kPa, the steam enters the pump as a saturated liquid. The adiabatic efficiency of the turbine is 80% and the mass flow of the water vapor circulating in the cycle is 40 kg/s.
a) Show the cycle in the diagram of T-s and P-h.
b) Find the turbine outlet dryness of the steam.
c) Calculate the thermal efficiency of the cycle.
d) Calculate the net power of the plant.
e) Find the mass flow of water vapor circulating in the cycle.
f) Calculate the daily fuel consumption according to the dry base analysis of the coal power plant as it is burned.
g) Find the amount of O2 released into the atmosphere in the flue gas.