Consider a cogeneration steam power plant that operates on a reheat Rankine cycle as shown in Figure 1. Meanwhile Figure 2 shows the T – s diagram of the plant. The plant is able to produce turbines power output of 8500 kW and supplies 3000 kW of process heat. Two units of turbines have been used in the plant namely high-pressure and low-pressure turbines. Superheated steam enters the high-pressure turbine at 8 MPa, 400 °C and the low-pressure turbine at 1.4 MPa, 400 °C of pressure and temperature, respectively. The steam is extracted at the end of the high pressure turbine to be used in process heater and leaves the process heater as saturated liquid then enters the mixing chamber. The remaining of steam from the high-pressure turbine is reheated to 400 °C and the steam leaves the condenser as a saturated liquid of 10 kPa. The isentropic efficiency of the turbines and pump are neglected in analyzing the system

Elements Of Electromagnetics
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Consider a cogeneration steam power plant that operates on a reheat Rankine cycle as shown in
Figure 1. Meanwhile Figure 2 shows the T – s diagram of the plant. The plant is able to produce
turbines power output of 8500 kW and supplies 3000 kW of process heat. Two units of turbines
have been used in the plant namely high-pressure and low-pressure turbines. Superheated steam
enters the high-pressure turbine at 8 MPa, 400 °C and the low-pressure turbine at 1.4 MPa, 400
°C of pressure and temperature, respectively. The steam is extracted at the end of the high
pressure turbine to be used in process heater and leaves the process heater as saturated liquid
then enters the mixing chamber. The remaining of steam from the high-pressure turbine is
reheated to 400 °C and the steam leaves the condenser as a saturated liquid of 10 kPa. The
isentropic efficiency of the turbines and pump are neglected in analyzing the system
performance. Determine:
a) The quality of steam at the turbines exit.
b) The mass flow rate of the steam produced by the boiler.
c) The utilization factor, ɛ of the cycle.
d) If the Process Heater has been removed and the Mixing Chamber is replaced with Open
Feed Water Heater. Sketch the new T-s diagram for this plant and discuss the advantages of
this plant.
Given that h4 = 514.17 kJ/kg and v4 = 0.001063 m²/kg
Transcribed Image Text:Consider a cogeneration steam power plant that operates on a reheat Rankine cycle as shown in Figure 1. Meanwhile Figure 2 shows the T – s diagram of the plant. The plant is able to produce turbines power output of 8500 kW and supplies 3000 kW of process heat. Two units of turbines have been used in the plant namely high-pressure and low-pressure turbines. Superheated steam enters the high-pressure turbine at 8 MPa, 400 °C and the low-pressure turbine at 1.4 MPa, 400 °C of pressure and temperature, respectively. The steam is extracted at the end of the high pressure turbine to be used in process heater and leaves the process heater as saturated liquid then enters the mixing chamber. The remaining of steam from the high-pressure turbine is reheated to 400 °C and the steam leaves the condenser as a saturated liquid of 10 kPa. The isentropic efficiency of the turbines and pump are neglected in analyzing the system performance. Determine: a) The quality of steam at the turbines exit. b) The mass flow rate of the steam produced by the boiler. c) The utilization factor, ɛ of the cycle. d) If the Process Heater has been removed and the Mixing Chamber is replaced with Open Feed Water Heater. Sketch the new T-s diagram for this plant and discuss the advantages of this plant. Given that h4 = 514.17 kJ/kg and v4 = 0.001063 m²/kg
HP -
LP -
Boiler
Turbine
Turbine
7
Reheater
Condenser
Process
heater
Pump II
Мixing
Pump I
Chamber
Figure 1
400°C
/10 MPa
5 1.4 MPa
1 3
7
10 kPa
Figure 2
Transcribed Image Text:HP - LP - Boiler Turbine Turbine 7 Reheater Condenser Process heater Pump II Мixing Pump I Chamber Figure 1 400°C /10 MPa 5 1.4 MPa 1 3 7 10 kPa Figure 2
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