Engineering, 29.07.2020 04:01 howme
A steam power plant design consists of an ideal Rankine cycle with regeneration. Steam enters Turbine 1 at P1 and T1 at the rate of m1 and exits at P2. A fraction (y') of the steam exiting Turbine 1 is diverted to a closed feedwater heater while the remainder enters Turbine 2. A portion (y'') of the steam exiting Turbine 2 at P3 is diverted to an open feedwater heater while the remainder enters Turbine 3. The exit of Turbine 3 is fed into a condenser that operates at P4. Saturared liquid exits the condenser and is fed to Pump 1. The outlet of Pump 1 is fed into the open feedwater heater. Saturated liquid exits the open feedwater heater and is fed to Pump 2. The outlet of pump 2 is fed to the closed feedwater heater. Saturated liquid exits the low pressure output of the closed feedwater heater and is fed through a steam trap to the open feedwater heater. Both exits of the closed feedwater heater are at the same temperature. All turbines and pumps are isentropic.
A) Determine the specific enthalpy (kJ/kg) at the inlet of turbine 1.
B) Determine the specific enthalpy (kJ/kg) at the exit of turbine 1.
C) Determine the specific enthalpy (kJ/kg) at the inlet of turbine 2 .
D) Determine the specific enthalpy (kJ/kg) at the exit of turbine 2.
E) Determine the specific enthalpy (kJ/kg) at the condenser exit.
F) Determine the specific enthalpy (kJ/kg) at the exit of the low pressure pump.
G) Determine the specific enthalpy (kJ/kg) at the exit of the feedwater heater.
H) Determine the specific enthalpy (kJ/kg) at the exit of the high pressure pump.
I) Determine the fraction (y') of flow diverted to the open feedwater heater.
J) Determine the power (MW) produced by turbine 1.
K) Determine the power (MW) produced by turbine 2.
L) Determine the power (kW) required (a positive number) by the low pressure pump.
M) Determine the power (kW) required (a positive number) by the high pressure pump.
N) Determine the total rate of heat transfer (MW) supplied to the boiler.
O) Determine the thermal efficiency (%) of the power plant.
Answers: 3
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A steam power plant design consists of an ideal Rankine cycle with regeneration. Steam enters Turbin...
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