A cogeneration plant as shown in Fig. 9.35 is designed to produce 600 MW power and 50 MW in process heat. The boiler pressure is 1000 psia, the extraction pressure is 200 psia, and the condenser pressure is 1 psia. The high-pressure turbine inlet temperature is 1000 F. The condenser water is pumped to a pressure of 200 psia before being mixed with the process water. The outflow of the mixing chamber is saturated liquid at 200 psia.

A. Determine the energy per mass of steam (Bt_u/lbm) passing through the high and low pressure turbines.

B. Determine the energy per mass of water (Bt_u/lbm) required in the low- and high-pressure feedwater pumps.

C. Determine the flow rate (lb_m/hr) required through the boiler and in the process steam to produce 600 MW of power and 50 MW of process heat.

D. Determine the utilization factor for this cogeneration cycle.

Fig. 9.35

Transcribed Image Text:

m Boiler பட·பா 2 Pump 2 m m Process Mixing Chamber (a) (1-y) m 3 5 6 Pump 1 Turbine (1-y) m Condenser Temperature, T 7 21 m ym (1-y) m Entropy, s (b) 5 3 m 4 (1-y) m S