Question

A steam power plant equipped with an open feed water heater as well as reheat arrangement, as shown in figure 1, supplies 50 kg/s of steam at 80 bar 470°C to the H.P. turbine. For feed heating, a part of steam is extracted at 7 bar and the remainder of the steam is reheated to 350°C in a reheater and then expanded in L.P. turbine down to 0.035 bar. The isentropic efficiency of both turbines is 0.85:

(a) Plot the T-s diagram of the cycle and identify all points corresponding to Fig. 1.

(b) Find the steam temperature at the exit of the HP turbine.

(c) Find the mount of steam bled-off for feed heating,

(d) Find the cycle efficiency

(e) Find the rate of entropy generated in the feed water heater, if the mixing process is adiabatic.

(f) The net power developed by the system

(g) The mass flow rate of the condenser cooling water if the river water enters the condenser at 18o C and leaves at 24o C.

Superheater www 80 bar, 470°C 1 kg Reheater wwwww (1-m) kg H.P. L.P. Boiler 80 bar m kg 2 0.035 bar (1-m) kg Cooling Water Co

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Answer #1

3324.33 Kolkg T So bar 3 nas kg ܛܓ = Ibar - 3163. I3 = 350°c 7.473 5 Pe= = 0.035 bar? Mes S Saga hus by + kolky ho by 0.3912817:35 Olin (3324.33 73.87 Koling 0.3869 1–193.87 2890.755 Che-be) + (1 -mo) -33 – 705.09) +(1-0.21606] ( 3163.7- 2 qin 2890

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