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Earlier post "Estimate Mixture Flammability & Explosivity
At
Reference P & T" discussed about the Lower flammable
limit
(LFL) or Lower Explosive Limit (LEL) and Upper flammable
limit (UFL) or Upper Explosive Limit (UEL) for single
component fluid and mixture at reference pressure (Pref) and
temperature (Tref). This post will discuss the way to correlate
the
LFL/LEL and UFL/UEL at Pref and Tref and operating pressure
(P)
and temperature (T) .
Temperature & Pressure Corrected LFL/LEL & UFL/UEL
Below are two equations may be used to correlate the LFL/LEL and
UFL/UEL at Pref and
Trefand operating pressure (P) and temperature (T).
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http://webwormcpt.blogspot.com/2009/09/estimate-mixture-flammability.html
4 27/04/2011 14:13
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7/30/2019 Estimate Mixture Flammability
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One shall take note that these equations are used for single
component. For a mixtures, the
LFL/LEL and UFL/UEL at operating pressure (P) and temperature
(T) will be calculated
using following equation (as discussed in "Estimate Mixture
Flammability & Explosivity
At Reference P & T":
Calculation Steps
2 steps in determining mixtures LFL/LEL and UFL/UEL at operating
pressure (P) and
temperature (T) .
(i) Estimate LFL/LEL and UFL/UEL at operating pressure (P) and
temperature (T) for every
component in a mixture
(ii) Estimate mixture LFL/LEL and UFL/UEL
Example
A mixture contains of Methane, Ethane and Propane with volume%
of 20%, 20% and 60%.
Estimate UEL at (i) 20 degC & 101.325 Pa, (ii) 70 degC &
3 MPa.
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http://webwormcpt.blogspot.com/2009/09/estimate-mixture-flammability.html
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Data
Methane (C1)
UELC1,20C,1ATM = 15.0%, EC1,combustion = 212.79 kcal/mole
Ethane (C2)
UELC2,20C,1ATM = 12.4%, EC2,combustion = 372.81 kcal/mole
Propane (C3)
UELC3,20C,1ATM = 10.1%, EC3,combustion = 526.74 kcal/mole
Output
(i) UELMix at 20 degC & 101.325 Pa
UELMix = 1 / [ 0.2/15 + 0.2 /12.4 + 0.6 / 10.1 ]
UELMix = 11.25 vol% at 20 degC & 101.325 kPaA
(ii) UELMix at 70 degC & 3 MPa
UELC1,7oC,3MPa= 15 x [1+0.75(70-20)/212.79]
+ 20.6 x [Log10(3)+1]
= 48.07 vol%
UELC2,7oC,3MPa= 12.4 x [1+0.75(70-20)/372.81]
+ 20.6 x [Log10(3)+1]= 44.08 vol%
UELC3,7oC, 3MPa= 10.1 x [1+0.75(70-20)/526.74]
+ 20.6 x [Log10(3)+1]
= 41.25 vol%
UELMix,70C,3MPa = 1 / [ 0.2/48.07 + 0.2 /44.08 + 0.6 / 41.25
]
UELMix,70C,3MPa = 43.02 vol% at 70 degC & 3 MPaA
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posted by Webworm, 8:14 AM
http://webwormcpt.blogspot.com/2009/09/estimate-mixture-flammability.html
4 27/04/2011 14:13
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2008-2010 Chemical & Process Technology | Design by
Webworm
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