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QUESTION 3 Feed water enters a boiler at 30°C. Steam leaves the boiler 95% dry at a pressure of 2600 KPa and passes through a super-heater where its temperature is raised to 260°C at constant pressure. The steam output is 8.5 kg of coal burnt. The coal has a calorific value of 50 MJ/kg, calculate (7) 3.1. The plant efficiency. 3.2. The equivalent evaporation from and at 100°C. (3) 3.3. The heat transfer rate per kg of coal in the evaporator and in the superheater. (3) 2

QUESTION 3 Feed water enters a boiler at 30°C. Steam leaves the boiler 95% dry at a pressure of 2600 KPa and passes through a super-heater where its temperature is raised to 260°C at constant pressure. The steam output is 8.5 kg of coal burnt. The coal has a calorific value of 50 MJ/kg, calculate (7) 3.1. The plant efficiency. 3.2. The equivalent evaporation from and at 100°C. (3) 3.3. The heat transfer rate per kg of coal in the evaporator and in the superheater. (3) 2

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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QUESTION 3 Feed water enters a boiler at 30°C. Steam leaves the boiler 95% dry at a pressure of 2600 KPa and passes through a super-heater where its temperature is raised to 260°C at constant pressure. The steam output is 8.5 kg of coal burnt. The coal has a calorific value of 50 MJ/kg, calculate (7) 3.1. The plant efficiency. 3.2. The equivalent evaporation from and at 100°C. (3) 3.3. The heat transfer rate per kg of coal in the evaporator and in the superheater. (3) 2
Transcribed Image Text:QUESTION 3 Feed water enters a boiler at 30°C. Steam leaves the boiler 95% dry at a pressure of 2600 KPa and passes through a super-heater where its temperature is raised to 260°C at constant pressure. The steam output is 8.5 kg of coal burnt. The coal has a calorific value of 50 MJ/kg, calculate (7) 3.1. The plant efficiency. 3.2. The equivalent evaporation from and at 100°C. (3) 3.3. The heat transfer rate per kg of coal in the evaporator and in the superheater. (3) 2
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