MadSci Network: Engineering
Query:

Re: Will combustion be supported at sonic velocity

Date: Wed Feb 18 10:09:09 2004
Posted By: Carlin Gregory, , Chemistry (BA and MS) in Synthetic , Williams Gas Pipelines - Texas Gas
Area of science: Engineering
ID: 1076425172.Eg
Message:

Ron,

Yes it will ignite.  The friction created by the air immediately around 
the glas flow will slow the gas enough to allow conditions for ignition.  
On the large scale the gas is burning but on the smaller scale the burning 
will only take place in an area where the ratio of the air/gas mixture 
falls between the upper and lower explosive limits.  For natural gas this 
is between about 5% and 16% natural gas in air.  Hydrogen sulfide is 4 to 
44%.  Carbon dioxide does not burn.  Completion of combustion will vary on 
too many factors to determine the overall rate.  These factors include 
debris in the flow, manner of venting, wind velocity, water content of the 
gas stream etc.


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