auto-ignition temperature of diesel
auto-ignition temperature of diesel
(OP)
Hi, I work with a project of using diesel to run a pig through a pipeline offshore in the northern sea. I know the auto-ignition temperature of the diesel we want to use is 450 deg C, . It is a possibility that the pressure in this pipeline will increase to a 100 barg. Will this change the auto ignition temperature by the change of pressure??
Thank you:)
Ann Elisabeth
Thank you:)
Ann Elisabeth





RE: auto-ignition temperature of diesel
Are you sure the given AIT of diesel is not in degrees Fahrenheit? Besides, may be thread71-85836 and thread798-89295 are helpful.
RE: auto-ignition temperature of diesel
cheers
RE: auto-ignition temperature of diesel
I referred to the given AIT of 450oC, which seems much higher than normal by about 200 degrees Celsius. The normal would be around 450K or, alternatively, around 450oF.
See:
ht
RE: auto-ignition temperature of diesel
I need to take this further, and discuss the reliability of the datasheet used for this project. U re right, it looks like it must be in Fahrenheit. The change of units is a dangerous thing in this business:)
cheers
RE: auto-ignition temperature of diesel
For autoignition of diesel, my guess would be about 300 C plus or minus 50 C.
For info, autoignition is strongly dependent on chain length and aromaticity.
RE: auto-ignition temperature of diesel
Diesel engines are characterized by high-compression (of air) and self-ignition (of the fuel).
CJKruger is right on the basic chemistry factors, but there also other such as catalysts, additives, degree of atomization or vaporization.
Depending on grades of diesel, cetane numbers greater than 40 may be specified. Cetane's AIT is 210oC. See http://en.wikipedia.org/wiki/Cetane.
RE: auto-ignition temperature of diesel
And it looks like I should focus more on the chain length and aromaticity of the diesel, than the pressure change in the pipeline?
Thank you both for ure time:)
RE: auto-ignition temperature of diesel
C16H34, n-hexadecane
Boiling point = 287 C
Autoignition = 202 C
C16H26, pentaethylbenzene
Boiling point = 277 C
Autoignition = 293 C
C16H18, 1-(4-ethylphenyl)-2-phenylethane
Boiling point = 292 C
Autoignition = 673 C
RE: auto-ignition temperature of diesel
Better concentrate on the process of air heating by compression.