1. Using a simple diagram, describe the working principle of a Combined Cycle Power Plant with...

 

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1. Using a simple diagram, describe the working principle of a Combined Cycle Power Plant with a supplementary firing system. In addition, explain how the supplementary firing will affect the thermal efficiency. [10 marks] 2. Explain the energy transfer of a dual pressure Heat Recovery Steam Generator using a Temperature - Heat Flux diagram. [10 marks] 3. For a combined-cycle power plant with dual-pressure HRSG, the following conditions are given: • High and low pressure: PHP 180 bars and PLP = 12 bars • Gas turbine exhaust gas flow rate and temperature, m, = 600 kg/s, texh = 600°C • Feedwater temperature for steam cycle: trw = 120° C • Superheated steam pressure and temperature p, = 180 bars, t, = 560°C • Pinch point, PP = 10 K • Specific heat of exhaust gas Cpg 1.05 kJ/kg-K • Specific heat of water, Cpw=4.187 kJ/kg-K Determine, (a) all properties and parameters of all states (b) the general steam production rate of the HRSG (c) gas turbine exhaust heat rate (d) the stack gas temperature [10 marks] [4 marks] [4 marks] [2 marks] 1. Using a simple diagram, describe the working principle of a Combined Cycle Power Plant with a supplementary firing system. In addition, explain how the supplementary firing will affect the thermal efficiency. [10 marks] 2. Explain the energy transfer of a dual pressure Heat Recovery Steam Generator using a Temperature - Heat Flux diagram. [10 marks] 3. For a combined-cycle power plant with dual-pressure HRSG, the following conditions are given: • High and low pressure: PHP 180 bars and PLP = 12 bars • Gas turbine exhaust gas flow rate and temperature, m, = 600 kg/s, texh = 600°C • Feedwater temperature for steam cycle: trw = 120° C • Superheated steam pressure and temperature p, = 180 bars, t, = 560°C • Pinch point, PP = 10 K • Specific heat of exhaust gas Cpg 1.05 kJ/kg-K • Specific heat of water, Cpw=4.187 kJ/kg-K Determine, (a) all properties and parameters of all states (b) the general steam production rate of the HRSG (c) gas turbine exhaust heat rate (d) the stack gas temperature [10 marks] [4 marks] [4 marks] [2 marks]

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