Question

AGL Energy is expanding the capacity of the Liddell Power Station. The plan is to commission a steam turbine power plant that operates on a regenerative Rankine cycle and has a net power output of 150 MW where steam enters the turbine at 10 MPa and 500°C, and the condenser at 10 kPa. The isentropic efficiency of the turbine is 80 percent, and that of the both pump is 95 percent. Steam is extracted from the turbine at 0.5 MPa to heat the feedwater in an open feedwater heater. Water leaves the feedwater heater as a saturated liquid. Show the cycle on a T-s diagram and determine, a) The mass flowrate of steam through the boiler b) The thermal efficiency of the cycle c) What would be the mass flow rate for a 200 MW output if the isentropic efficiency of the turbine is 90 percent? d) What could be done to make a 2 percent increase in the overall thermal efficiency? Provide valid evidence with calculation. Turbine Boiler Open FWH Condenser Pump II Pump I

C and D please.

Answer 1

T-s DiTow Sat.liguid hs hfes0xf =0.00.010 m3tı.y vfe.logfa. state: 0.5 Ma. Stode. 3: Stote 4: 0.001013 ('10,000-5 State 5:

f:@0、SMfa + ·"Y@wsinta 65951 8604 1-4.9603 or, Xs=0.9554 1948(743 3 Pump efficiencyノ95%、 O 95

Mods flow rate through boiler rte from boiler 0.JS2.嘲 h6一^ h,ノー = (33151-265464) f0-0.182) (2654.07 23% , 구3 r(i-ow)(m.ss-ns zij + (15.02-い0ッ b) thermal efftejeney of er th.wnet gin 963-05 0.35 28 35.287-(Ang mess flow ate of

Henee If increase 2% herwaken 3) 31-787 h-65%。2. Htence, we should loweriny endenser Pressure to jc ra Value of 3 2 28.9," fore entering tretne.