Question 3 A new coal supplier sent you a sample from two separate mine sites, with the ultimate analysis of the dry coal given below: Coal A (9%) 75 15 10 2 8. Coal B 77 Component H. 5 1 11 Ash How much energy is released from perfectly combusting 1kg of each coal (C and H) under standard conditions? How much air is required to burn that 1 kg? Assume that the system is operated with 40% excess air, at 35°C, 1 atm, and 70% relative humidity. (Note: the saturation pressure of water vapour at 35°C is 5.63 kPa) Based on the above analysis, what coal would you recommend? What are 3 other factors that may need to be considered for this decision? 469
Question 3 A new coal supplier sent you a sample from two separate mine sites, with the ultimate analysis of the dry coal given below: Coal A (9%) 75 15 10 2 8. Coal B 77 Component H. 5 1 11 Ash How much energy is released from perfectly combusting 1kg of each coal (C and H) under standard conditions? How much air is required to burn that 1 kg? Assume that the system is operated with 40% excess air, at 35°C, 1 atm, and 70% relative humidity. (Note: the saturation pressure of water vapour at 35°C is 5.63 kPa) Based on the above analysis, what coal would you recommend? What are 3 other factors that may need to be considered for this decision? 469
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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Transcribed Image Text:Question 3
A new coal supplier sent you a sample from two separate mine sites, with the
ultimate analysis of the dry coal given below:
Component
C
Coal A (96)
75
Coal B
77
10
Ash
11
How much energy is released from perfectly combusting 1kg of each coal (C and H)
under standard conditions?
How much air is required to burn that 1 kg? Assume that the system is operated
with 40% excess air, at 35°C, 1 atm, and 70% relative humidity. (Note: the
saturation pressure of water vapour at 35°C is 5.63 kPa)
Based on the above analysis, what coal would you recommend? What are 3 other
factors that may need to be considered for this decision?
6614H
1200
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