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Steam at a pressure of 20 bar and 250°C enters a turbine and leave finally at a pressure of 0.05 bar. Three feed water heated are used which are operating at 5 bar, 1.5 bar and 0.3 bar. Assume following data for steam.At 20 bar and 250°C, h= 2905 kJ/kg, Enthalpy of steam entering first, second and third feed water heaters are 2600 kJ/kg, 2430 kJ/kg and 2210 kJ/kg respectively. Enthalpy of steam finally leaving the turbine is 2000 kJ/kg.At 5 bar; hf = 640.1 kJ/kg.At 1.5 bar, hf = 467.1 kJ/kg.At 0.3 bar; hf = 289.3 kJ/kg.At 0.05 bar, hf = 137.8 kJ/kg.The mass of bled steam per kg of steam flow at third feed water heater operating at 0.3 bar is ___ kg. (Neglect all pump works) 0.084 |
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Answer» Steam at a pressure of 20 bar and 250°C enters a turbine and leave finally at a pressure of 0.05 bar. Three feed water heated are used which are operating at 5 bar, 1.5 bar and 0.3 bar. Assume following data for steam. At 20 bar and 250°C, h= 2905 kJ/kg, Enthalpy of steam entering first, second and third feed water heaters are 2600 kJ/kg, 2430 kJ/kg and 2210 kJ/kg respectively. Enthalpy of steam finally leaving the turbine is 2000 kJ/kg. At 5 bar; hf = 640.1 kJ/kg. At 1.5 bar, hf = 467.1 kJ/kg. At 0.3 bar; hf = 289.3 kJ/kg. At 0.05 bar, hf = 137.8 kJ/kg. The mass of bled steam per kg of steam flow at third feed water heater operating at 0.3 bar is ___ kg. (Neglect all pump works)
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