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ds to a pressure of 0.4 MPa. A a pressure of 10 kPa. Part of t tracted steam is used for proce- mixed with the feedwater leavin

ds to a pressure of 0.4 MPa. A a pressure of 10 kPa. Part of t tracted steam is used for proce- mixed with the feedwater leavin

Elements Of Electromagnetics
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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Consider a cogeneration power plant modified with regeneration. Steam enters the turbine at 6 MPa and 450°C at a rate of 20 kg/s and expands to a pressure of 0.4 MPa. At this pressure, 60% of the steam is extracted from the turbine, and the remainder expands to a pressure of 10 kPa. Part of the extracted steam is used to heat feedwater in an open feedwater heater. The rest of the extracted steam is used for process heating and leaves the process heater as a saturated liquid at 0.4 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 463 kg/s. Isentropic efficiencies = 90% ( pumps and turbine) Determine the following: Boiler PII Process heater 6 8 fwh + PI Turbine 10 1. The total power output of the of the plant (KW) is Answer: Condenser h₁ 191.81 h₂-192.20 h₂=h₂ h₂= 604.66 hs 610.73 h6-3302.9 h=h₂ h₂o-2665.6 h₁=2128.8 2. The temperature rise of the cooling water from the river in the condenser is Answer: 3. The mass flow rate of steam through the process heater is (kg/sec): Answer: 4. The rate of heat supply from the process heater per unit mass of steam passing through it is Answer: 5. The rate of heat transfer to the steam in the boiler is (MJ/sec): Answer:
Transcribed Image Text:Consider a cogeneration power plant modified with regeneration. Steam enters the turbine at 6 MPa and 450°C at a rate of 20 kg/s and expands to a pressure of 0.4 MPa. At this pressure, 60% of the steam is extracted from the turbine, and the remainder expands to a pressure of 10 kPa. Part of the extracted steam is used to heat feedwater in an open feedwater heater. The rest of the extracted steam is used for process heating and leaves the process heater as a saturated liquid at 0.4 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 463 kg/s. Isentropic efficiencies = 90% ( pumps and turbine) Determine the following: Boiler PII Process heater 6 8 fwh + PI Turbine 10 1. The total power output of the of the plant (KW) is Answer: Condenser h₁ 191.81 h₂-192.20 h₂=h₂ h₂= 604.66 hs 610.73 h6-3302.9 h=h₂ h₂o-2665.6 h₁=2128.8 2. The temperature rise of the cooling water from the river in the condenser is Answer: 3. The mass flow rate of steam through the process heater is (kg/sec): Answer: 4. The rate of heat supply from the process heater per unit mass of steam passing through it is Answer: 5. The rate of heat transfer to the steam in the boiler is (MJ/sec): Answer:
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