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Low BTU flaring

Low BTU flaring

Low BTU flaring

(OP)
Is there an easy way to calculate how high a N2 (or CO2)  concentration one may have in a gas stream before flaring becomes impossible?  Calculating calorific value is easy enough, but it does not tell me when I reach the LEL.

Cheers!

RE: Low BTU flaring

This is a quote from page 487 of Lees book Loss Prevention in the Process Industries.

"For many flammable gas-air systems, the mixture can be rendered nonflammable by the addition of about 30% of carbon dioxide or about 40% of nitrogen."

Percents are mol or vol % based on the contect. Ethylene requires 50% nitrogen or 41% carbon dioxide. If you want to calculate the numbers see NFPA 69.

HAZOP at www.curryhydrocarbons.ca

RE: Low BTU flaring

(OP)
Thanks a lot, guys - that was exactly the info I needed!thumbsup2

RE: Low BTU flaring

Trond

Jumping in a little late here.  Download my paper "Improving flare design" from www.geocities.com/flareman_xs navigate to "main index:downloads".
There is a procedure in there to determine flammability for any inert flammable mixture.
(and my opinion about application of arbitrary rules such as 300 Btu/scf)

David
 

RE: Low BTU flaring

(OP)
Cheers, David - a great site you've got there, which I have now bookmarked for future reference!

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