The gas turbine cycle of a gas-steam combined cycle power plant
has a pressure ratio of 12. The air enters the compressor at 310 K
and 100 kPa (1) and the turbine at 1400 K (3). The combustion gases
leaving the gas turbine (4) are used to heat the steam to 12.5 MPa
up to 500 °C (6) in a heat exchanger. The flue gas exits the heat
exchanger (5) at 247 °C. The steam is expanded in a high pressure
turbine to a pressure of 2.5 MPa, and is reheated in the combustion
chamber to 550 °C before it expands in the low pressure turbine to
10 kPa. The steam mass flow is 12 kg/s. Establish the appropriate
working conditions and assumptions. Assuming isentropic pump
efficiencies 75%, compressor 85% and both turbines 90%,
a) Draw a diagram of the installation (0.5)
b) Complete the table of states indicated for each state
considered, p, T, h, s, exergy and steam title when necessary and
draw the T-s diagram of the combined cycle. Include the water
saturation curve in the drawing and represent all the states of the
cycle in the diagram (1)
b) Calculate the air flow rate in the system. (0.5)
c) Calculate the thermal power supplied by the combustor. (0.5)
d) Heat dissipated in the condenser (0.5)
(e) Net power supplied by the system (1)
(f) Combined cycle thermal performance (1 )
(g) Exergy destroyed in the intermediate exchanger (1 )
(h) Exergetic performance of the combined cycle (1)
(i) Classify the elements of the installation according to the
exergy destroyed in each of them by reference to the total exergy
destroyed in the combined cycle (%) (1 ). You can represent the
result graphically in whatever way you think is most
appropriate.
(g) Analyse the effect of the isentropic efficiency of the steam
turbine on the exergy and thermal efficiency of the combined cycle
using a parametric table. Represent the results in a single graph
including both yields (2)
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The gas turbine cycle of a gas-steam combined cycle power plant has a pressure ratio of...
Problem 2/2 (50%) -The gas-turbine cycle of a combined gas-steam power plant has a pressure ratio of 12. Air enters the compressor at 310 K and the turbine at 1400 K. The combustion gases leaving the gas turbine are used to heat the steam at 12.5 MPa to 500 C in a heat exchanger. The combustion gases leave the heat exchanger at 247"C. Steam expands in a high pressure turbine to a pressure of 2.5 MPa and is reheated in...
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