A. Describe briefly with the aid of illustrative sketches the following in a combined cycle plant: (a) Supplementary firing. (b) Waste heat recovery boiler, (c) Pinch-point, (d) Supercharged boiler B....

(a) Supplementary firing.

(b) Waste heat recovery boiler,

(c) Pinch-point,

(d) Supercharged boiler

B. Which fuels are generally used in combined cycle power plants?

C. Prove that the overall efficiency and heat rate of combined gas and steam cycle plants are given by

Here R denotes heat rate.

State the assumption used.

C. (a) Prove that the distribution of specific work (kJ/kg of gas) in the gas and steam turbine plants is approximately given by

(b) Determine the values of the overall efficiency of the combined cycle, heat rate and work ratio for
gt = 26.66%,
st = 34.85%