5. Consider a cogeneration power plant modified with regeneration as shown in the Fig. 2 Steamenters the turbine at 6 MPa and 450 °C and expands to pressure of 0.4 MPa. At this pressure2 of60% of the steam is extracted from the turbine and the remainder expands to 10 kPa. Part of theextracted steam is used to heat the feedwater in an open feedwater heater. The rest of the extractedsteam is used for process heating and leaves the process heater as a saturated liquid at 0.4 MPa. Itis subsequently mixed with the feedwater leaving the feed water heater, and the mixture is pumpedto the boiler pressure. Assume the turbines and pumps to be isentropic, determine the mass flow17.7 kg/rate of steam through the boiler for a net power output of 15 MWTurbine8BoilerProcessheater-tCondenserFWHPump IIPump IFigure 2: An Cogeneration power plant

Answered: 5. Consider a cogeneration power plant…

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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1. Consider a steam power plant operating on the simple ideal Rankine cycle. Steam enters the turbine at 3 MPa and 350°C and is condensed in the condenser at a pressure of 75 kPa. Determine the thermal efficiency of this cycle.
Consider a thermal power plant with reheating and cogeneration. It produces 5 MW of power and 4 MW of process heat. The steam enters the high-pressure turbine at 8 MPa and 480 °C and expands to 1.2 MPa, to be reheated to 450 C. Subsequently, at a pressure of 0.8 MPa, a fraction of 0.152 of steam is extracted, which is sent as process heat. Then, at a pressure of 0.25 MPa, another extraction is made to preheat feed water in a closed heater, whose condensate (saturated liquid) expands and is sent to the condenser, whose pressure is 15 kPa, from which saturated liquid comes out. Subsequently, it is pumped to a mixer where it joins with the subcooled liquid at 120 C and 0.8 MPa that comes from the industrial process, to be later pumped to the steam generator. Consider the isentropic efficiencies of the turbines of 88% and of the pumps of 82%. In the steam generator and in the superheater, natural gas is used, whose simplified composition is 83.2% CH4, 11% C2H6, 0.8% S, 3.6% N2 and 1.4% CO2…
Consider a thermal power plant with reheating and cogeneration. It produces 5 MW of power and 4 MW of process heat. The steam enters the high-pressure turbine at 8 MPa and 480 °C and expands to 1.2 MPa, to be reheated to 450 C. Subsequently, at a pressure of 0.8 MPa, a fraction of 0.152 of steam is extracted, which is sent as process heat. Then, at a pressure of 0.25 MPa, another extraction is made to preheat feed water in a closed heater, whose condensate (saturated liquid) expands and is sent to the condenser, whose pressure is 15 kPa, from which saturated liquid comes out. Subsequently, it is pumped to a mixer where it joins with the subcooled liquid at 120 C and 0.8 MPa that comes from the industrial process, to be later pumped to the steam generator. Consider the isentropic efficiencies of the turbines of 88% and of the pumps of 82%. In the steam generator and in the superheater, natural gas is used, whose simplified composition is 83.2% CH4, 11% C2H6, 0.8% S, 3.6% N2 and 1.4% CO2…
Consider a thermal power plant with reheating and cogeneration. It produces 5 MW of power and 4 MW of process heat. The steam enters the high-pressure turbine at 8 MPa and 480 °C and expands to 1.2 MPa, to be reheated to 450 C. Subsequently, at a pressure of 0.8 MPa, a fraction of 0.152 of steam is extracted, which is sent as process heat. Then, at a pressure of 0.25 MPa, another extraction is made to preheat feed water in a closed heater, whose condensate (saturated liquid) expands and is sent to the condenser, whose pressure is 15 kPa, from which saturated liquid comes out. Subsequently, it is pumped to a mixer where it joins with the subcooled liquid at 120 C and 0.8 MPa that comes from the industrial process, to be later pumped to the steam generator. Consider the isentropic efficiencies of the turbines of 88% and of the pumps of 82%. In the steam generator and in the superheater, natural gas is used, whose simplified composition is 83.2% CH4, 11% C2H6, 0.8% S, 3.6% N2 and 1.4% CO2…
A thermal power plant works according to a Rankine Cycle with Regeneration with an open heater. The steam enters the first stage of the turbine at 10 MPa and 650 °C, expanding to 1.4 MPa. Subsequently, part of the steam is extracted and leads to the open heater that operates at 1.4 MPa. The remaining steam expands through the second stage of the turbine to a capacitor pressure of 5 kPa. For isentropic processes in both turbines and pumps, determine the enthalpy values of all points in the cycle, as well as the efficiency of the latter.
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