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Q1 (а) Differentiate between open feedwater heaters and closed feedwater heaters. (b) Considjer a cj-fired stjeam pjwer plant that produces 300 MW of electric power. The power plant operates on a simple ideal Rankine cycle with turbine inlet conditions of 5 MPa and 450°C and a condenser pressure of 25 kPa. The coal has a heating value (energy released when the fuel is burned) of 29,300 kJ/kg. Assuming that 75 percent of this energy is transferred to the steam in the boiler and that the electric generator has an efficiency of 96 percent, determine; the overall plant efficiency (the ratio of net electric power output to the energy input as fuel); and (i) (ii) the required rate of coal supply.

Q1 (а) Differentiate between open feedwater heaters and closed feedwater heaters. (b) Considjer a cj-fired stjeam pjwer plant that produces 300 MW of electric power. The power plant operates on a simple ideal Rankine cycle with turbine inlet conditions of 5 MPa and 450°C and a condenser pressure of 25 kPa. The coal has a heating value (energy released when the fuel is burned) of 29,300 kJ/kg. Assuming that 75 percent of this energy is transferred to the steam in the boiler and that the electric generator has an efficiency of 96 percent, determine; the overall plant efficiency (the ratio of net electric power output to the energy input as fuel); and (i) (ii) the required rate of coal supply.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Q1 (a) Differentiate between open feedwater heaters and closed feedwater heaters. (b) Consider a coal-fired steam power plant that produces 300 MW of electric power. The power plant operates on a simple ideal Rankine cycle with turbine inlet conditions of 5 MPa and 450°C and a condenser pressure of 25 kPa. The coal has a heating value (energy released when the fuel is burned) of 29,300 kJ/kg. Assuming that 75 percent of this energy is transferred to the steam in the boiler and that the electric generator has an efficiency of 96 percent, determine; (i) the overall plant efficiency (the ratio of net electric power output to the energy input as fuel); and (ii) the required rate of coal supply.
Transcribed Image Text:Q1 (a) Differentiate between open feedwater heaters and closed feedwater heaters. (b) Consider a coal-fired steam power plant that produces 300 MW of electric power. The power plant operates on a simple ideal Rankine cycle with turbine inlet conditions of 5 MPa and 450°C and a condenser pressure of 25 kPa. The coal has a heating value (energy released when the fuel is burned) of 29,300 kJ/kg. Assuming that 75 percent of this energy is transferred to the steam in the boiler and that the electric generator has an efficiency of 96 percent, determine; (i) the overall plant efficiency (the ratio of net electric power output to the energy input as fuel); and (ii) the required rate of coal supply.
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