How do you calculate the autoignition temperature of a gas mixture?

[electengr1]

This was a topic in thread135-86198.

In this thread (the last post) a poster by the name of jcaiken said:

"One standard (can't remember which) identifies that the impact of gas components less than 10% by vol can be discounted but the overall AIT should then be based on the lowest component AIT."

Does anyone know which standard he/she is referring to?

Thanks in advance!!

 

[zdas04]

I think they must have been determined experimentally back in antiquity. I've been looking for a way to predict autoignition temp for 15 years through 100s of books and found quite a few tables (with a range of values for any given gas), but no equations.

David

 

[electengr1]

Thank you for the response.

Is there a standard that says you are able to discount part of the mixture that make up less than 10% of the total? Maybe a NFPA standard?

 

[unclesyd]

Here is little information that might help.

http://www.aristatek.com/newsletter/0606June/TechSpeak.aspx

This is form a PEAC-WMD software site but there is a tremendous amount of information out there on calculating autoignition temperatures.

Where is MB when you need him?