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!
Cheers!





RE: Low BTU flaring
"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
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For compliance with US 40 CFR 60.18, many companies add a process gas chromatograph to the flare line with controls to add fuel gas during low btu conditions. The fuel gas is added to assure greater than 11.2 MJ/scm (300 Btu/scf).
RE: Low BTU flaring
RE: Low BTU flaring
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