Lower flammability limit (LFL) for butane in air is 3.5 mole%. Butane-air mixture cannot be ignited below LFL. Above 3.5 mole%, butane-air mixture can be ignited in the presence of spark. Q1. A butane-air mixture containing 6.5 mole% of butane (fuel gas) is fed to mixing unit before a combustion furnace. During an operation, a serious technical issue is detected and ignition in the furnace must be prevented by introducing a stream of pure air to the mixing unit. mol а mol C,Hzo/mol mol b mol air/mol To furnace MIXING UNIT c mol C,H10/mol mol air d mol air/mol Figure Q1 (i) Flow chart of the fuel gas-dilution air mixing unit is provided in Figure Q1. By presuming that the gas entering the furnace contains butane at LFL, determine the values of a, b, c and d. (a) (ii) Perform the degree-of-freedom analysis for this system. If butane flows at a rate of 200 mol C4H10/s, determine the minimum molar flow rate of the dilution air needed in order to prevent ignition. (iii) (iv) If the molar flow rate of the dilution air is 5000 mol/s, calculate the maximum butane-air mixture flow rate (ħ,) if the gas entering the furnace contains butane at LFL.
Lower flammability limit (LFL) for butane in air is 3.5 mole%. Butane-air mixture cannot be ignited below LFL. Above 3.5 mole%, butane-air mixture can be ignited in the presence of spark. Q1. A butane-air mixture containing 6.5 mole% of butane (fuel gas) is fed to mixing unit before a combustion furnace. During an operation, a serious technical issue is detected and ignition in the furnace must be prevented by introducing a stream of pure air to the mixing unit. mol а mol C,Hzo/mol mol b mol air/mol To furnace MIXING UNIT c mol C,H10/mol mol air d mol air/mol Figure Q1 (i) Flow chart of the fuel gas-dilution air mixing unit is provided in Figure Q1. By presuming that the gas entering the furnace contains butane at LFL, determine the values of a, b, c and d. (a) (ii) Perform the degree-of-freedom analysis for this system. If butane flows at a rate of 200 mol C4H10/s, determine the minimum molar flow rate of the dilution air needed in order to prevent ignition. (iii) (iv) If the molar flow rate of the dilution air is 5000 mol/s, calculate the maximum butane-air mixture flow rate (ħ,) if the gas entering the furnace contains butane at LFL.
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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how to solve part (a) and (b)?
Transcribed Image Text:Q1.
Lower flammability limit (LFL) for butane in air is 3.5 mole%. Butane-air mixture
cannot be ignited below LFL. Above 3.5 mole%, butane-air mixture can be ignited in
the presence of spark.
A butane-air mixture containing 6.5 mole% of butane (fuel gas) is fed to mixing unit
before a combustion furnace. During an operation, a serious technical issue is detected
and ignition in the furnace must be prevented by introducing a stream of pure air to the
mixing unit.
mol
а mol C, Hio/mol
mol
b mol air/mol
-To furnace
MIXING
UNIT
c mol C,H10/mol
d mol air/mol
mol air
Figure Q1
(a)
(i)
Flow chart of the fuel gas-dilution air mixing unit is provided in
Figure Q1. By presuming that the gas entering the furnace contains
butane at LFL, determine the values of a, b, c and d.
(ii)
Perform the degree-of-freedom analysis for this system.
(iii)
If butane flows at a rate of 200 mol C4H10/s, determine the minimum
molar flow rate of the dilution air needed in order to prevent ignition.
(iv) If the molar flow rate of the dilution air is 5000 mol/s, calculate the
maximum butane-air mixture flow rate (ň1) if the gas entering the
furnace contains butane at LFL.
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