A boiler produces 5.4 tonnes/hour of steam at a pressure of 1.5 MPa and a temperature of 350°C. Feedwater enters at a temperature of 44.5°C. At exit from the economizer part of the boiler the temperature is 93.5°C. At exit from the evaporator part of the boiler the steam is 90 A % dry. Energy is supplied by 600 kg of coal per hour, which has a calorific value of 32 MJ/kg. The A/F ratio is 15 1. The temperature of the flue gas at exit from the the economizer part of the boiler is 210°C. The average specific heat at constant pressure of the flue gas in the economizer is 1045 J/kg.K. When the ambient temperature is 24°C: 7. [83.3 %] Calculate the efficiency of the boiler. Calculate the equivalent evaporation from and at 100°C per unit mass of fuel. 7.1 7.2 [11.9] 7.3 Draw up an energy balance, on a kJ/kg coal basis, with percentages of the total energy supplied. Jeconomizer 6.8 %, evaporator 62 %, superheater 15.5 %, to atmosphere 9.7 %, other Josses 7 %)
A boiler produces 5.4 tonnes/hour of steam at a pressure of 1.5 MPa and a temperature of 350°C. Feedwater enters at a temperature of 44.5°C. At exit from the economizer part of the boiler the temperature is 93.5°C. At exit from the evaporator part of the boiler the steam is 90 A % dry. Energy is supplied by 600 kg of coal per hour, which has a calorific value of 32 MJ/kg. The A/F ratio is 15 1. The temperature of the flue gas at exit from the the economizer part of the boiler is 210°C. The average specific heat at constant pressure of the flue gas in the economizer is 1045 J/kg.K. When the ambient temperature is 24°C: 7. [83.3 %] Calculate the efficiency of the boiler. Calculate the equivalent evaporation from and at 100°C per unit mass of fuel. 7.1 7.2 [11.9] 7.3 Draw up an energy balance, on a kJ/kg coal basis, with percentages of the total energy supplied. Jeconomizer 6.8 %, evaporator 62 %, superheater 15.5 %, to atmosphere 9.7 %, other Josses 7 %)
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
![A boiler produces 5.4 tonnes/hour of steam at a pressure of 1.5 MPa and a temperature of
350°C. Feedwater enters at a temperature of 44.5°C. At exit from the economizer part of the
boiler the temperature is 93.5°C. At exit from the evaporator part of the boiler the steam is 90
A % dry. Energy is supplied by 600 kg of coal per hour, which has a calorific value of
32 MJ/kg. The A/F ratio is 15 1. The temperature of the flue gas at exit from the the
economizer part of the boiler is 210°C. The average specific heat at constant pressure of the
in the economizer is 1045 J/kg.K. When the ambient temperature is 24°C :
7.
IS
flue
gas
7.1
Calculate the efficiency of the boiler.
[83.3 %]
Calculate the equivalent evaporation from and at 100°C per unit mass of fuel.
|11.9|
Draw up an energy balance, on a kJ/kg coal basis, with percentages of the total energy
supplied.
Jeconomizer 6.8 %, evaporator 62 %, superheater 15.5 %, to atmosphere 9.7 %, other
7.2
7.3
losses 7 %]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fef92027e-5c85-4086-bcd5-7bc3771367b2%2Ffbf95621-c6b8-4c1e-aa0c-a197d65d659e%2Fkwx9ijg_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A boiler produces 5.4 tonnes/hour of steam at a pressure of 1.5 MPa and a temperature of
350°C. Feedwater enters at a temperature of 44.5°C. At exit from the economizer part of the
boiler the temperature is 93.5°C. At exit from the evaporator part of the boiler the steam is 90
A % dry. Energy is supplied by 600 kg of coal per hour, which has a calorific value of
32 MJ/kg. The A/F ratio is 15 1. The temperature of the flue gas at exit from the the
economizer part of the boiler is 210°C. The average specific heat at constant pressure of the
in the economizer is 1045 J/kg.K. When the ambient temperature is 24°C :
7.
IS
flue
gas
7.1
Calculate the efficiency of the boiler.
[83.3 %]
Calculate the equivalent evaporation from and at 100°C per unit mass of fuel.
|11.9|
Draw up an energy balance, on a kJ/kg coal basis, with percentages of the total energy
supplied.
Jeconomizer 6.8 %, evaporator 62 %, superheater 15.5 %, to atmosphere 9.7 %, other
7.2
7.3
losses 7 %]
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