1: A vapor (steam) power cycle with a steam generator pressure of 15 MPa is under...

  

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1: A vapor (steam) power cycle with a steam generator pressure of 15 MPa is under consideration for a 210 MW power plant. The maximum steam cycle temperature may not exceed 550°C. The steam turbine has two stages. Steam from the boiler enters the 1st stage steam turbine. After expansion in 1st stage turbine, some steam is extracted and fed to the open feedwater heater. The remaining steam is reheated in the boiler again and enters the 2nd stage steam turbine and expands to the condenser pressure. It is given that the isentropic efficiency of the steam turbine is 0.88 for both stages and the pumps operate in an isentropic manner. Show the schematic diagram of the proposed steam cycle layout and provide the detailed calculations. Determine the mass flow rate of steam entering the 1st stage steam turbine and thermal efficiency of the plant. 2: Vast quantities of water circulate through the condensers of large power plants, leaving at temperatures 10 to 15° C above the ambient temperature. What possible uses could be made of the condenser cooling water? Does this warm water represent a significant resource? What environmental concerns are associated with this? Discuss. 1: A vapor (steam) power cycle with a steam generator pressure of 15 MPa is under consideration for a 210 MW power plant. The maximum steam cycle temperature may not exceed 550°C. The steam turbine has two stages. Steam from the boiler enters the 1st stage steam turbine. After expansion in 1st stage turbine, some steam is extracted and fed to the open feedwater heater. The remaining steam is reheated in the boiler again and enters the 2nd stage steam turbine and expands to the condenser pressure. It is given that the isentropic efficiency of the steam turbine is 0.88 for both stages and the pumps operate in an isentropic manner. Show the schematic diagram of the proposed steam cycle layout and provide the detailed calculations. Determine the mass flow rate of steam entering the 1st stage steam turbine and thermal efficiency of the plant. 2: Vast quantities of water circulate through the condensers of large power plants, leaving at temperatures 10 to 15° C above the ambient temperature. What possible uses could be made of the condenser cooling water? Does this warm water represent a significant resource? What environmental concerns are associated with this? Discuss.

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