Q2. A cogeneration steam power plant has been modified with introducing an open feedwater heater as shown in figure below. Working pressure of the plant is between 6 MPa and 10 kPa for the boiler pressure and condensate pressure. The steam is extracted at 0.5 MPa for process heater and feedwater heater. The superheated srteam enters the turbine at 500°C at a rate of 25 kg/s and expands to the condensate pressure of 0.5 MPa. There is 60 percent of the steam is extracted from the turbine at the pressure of 0.5 MPa, and the remainder expands to a pressure of 10 kPa. Part of the extracted steam is used to heat feedwater and the rest of the extracted steam is used for process heating. The steam leaves the process heater as a saturated liquid at 0.5 MPa. It is subsequently mixed with the feedwater leaving the feedwater heater, and the mixture is pumped to the boiler pressure. The steam in the condenser is cooled and condensed by the cooling water from a nearby river, which enters the adiabatic condenser at a rate of 470 kg/s. Sketch T-s diagram and solve following parameters:

Q2. A cogeneration steam power plant has been modified with introducing an open feedwater heater as shown in figure below. Working pressure of the plant is between 6 MPa and 10 kPa for the boiler pressure and condensate pressure. The steam is extracted at 0.5 MPa for process heater and feedwater heater. The superheated srteam enters the turbine at 500°C at a rate of 25 kg/s and expands to the condensate pressure of 0.5 MPa. There is 60 percent of the steam is extracted from the turbine at the pressure of 0.5 MPa, and the remainder expands to a pressure of 10 kPa. Part of the extracted steam is used to heat feedwater and the rest of the extracted steam is used for process heating. The steam leaves the process heater as a saturated liquid at 0.5 MPa. It is subsequently mixed with the feedwater leaving the feedwater heater, and the mixture is pumped to the boiler pressure. The steam in the condenser is cooled and condensed by the cooling water from a nearby river, which enters the adiabatic condenser at a rate of 470 kg/s. Sketch T-s diagram and solve following parameters:

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Q2. A cogeneration steam power plant has been modified with introducing an open feedwater heater as
shown in figure below. Working pressure of the plant is between 6 MPa and 10 kPa for the boiler
pressure and condensate pressure. The steam is extracted at 0.5 MPa for process heater and feedwater
heater. The superheated srteam enters the turbine at 500°C at a rate of 25 kg/s and expands to the
condensate pressure of 0.5 MPa. There is 60 percent of the steam is extracted from the turbine at the
pressure of 0.5 MPa, and the remainder expands to a pressure of 10 kPa. Part of the extracted steam is
used to heat feedwater and the rest of the extracted steam is used for process heating. The steam leaves
the process heater as a saturated liquid at 0.5 MPa. It is subsequently mixed with the feedwater leaving
the feedwater heater, and the mixture is pumped to the boiler pressure. The steam in the condenser is
cooled and condensed by the cooling water from a nearby river, which enters the adiabatic condenser at
a rate of 470 kg/s. Sketch T-s diagram and solve following parameters:
a) Power produce by the turbine, and
b) Plant utilization factor
ANSWER
Turbine
Boiler
Process
heater
Condenser
1-0
FWH
Pump II
PumpI

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