In this design project, you are designing a 500 MWe coal-fired powerplant based on a reheat cycle. You are expected to use the knowledge that you obtained during this semester regarding steam based power cycle, mixture and chemical reaction.

1. This powerplant has 3 stages of turbine, operating at 10 MPa, 5 MPa, and 1.5 MPa. Condenser operate at 75 kPa. Determine the maximum temperature at the turbine inlet. (It should be less than 620°C). Based on your design, draw T-s diagram, identify each state. Assume the isentropic efficiency of the turbine and compressor as 0.9.

2. Calculate the total amount (mass flow rate) of steam to generate amount of 500MWe power and calculate the total amount of heat that the boiler requires to supply. Assume the generator efficiency is 95%.

3. From the analysis, we obtained the mass composition of coal as C 72.2%, H 5.0%, O 21.5%, N 1.2%, S 0.1%, and LHV was 20.45 MJ/kg. Calculate amount of the fuel required to obtain the thermal energy that we need (from Question 2).

4. Based on the amount of fuel we burned, establish the chemical reaction equation of this powerplant. (*Consider we need excess air ratio (EAR) of 0.2)
5. Calculate the mass flow rate of the dry air supply with EAR 0.2.

6. Let's assume, we have the air at 5°C, RH20% in winter and 30°C, RH50% in summer. Assuming we dehumidify the air completely before we supply into the boiler. Calculate the mass flow rate of atmospheric air intake to obtain the dry air supply calculated in question 5.

(Hint: dry bulb T+RH→absolute humidity→water vapor mass→atmospheric air mass)