Normal Butane Number Fuel gas knock ratings 1

[Monagas]

Hi Friends,

I need information about the "n-butane number" used to rate a fuel gas knock resistance for gas engines.
I would like to know if there is any calculation method available, and how I could obtain it.

I will appreciate it, Thanks

Saludos !!!!!

 

[Eltron]

The OCTANE rating of gasoline is the measure of knock resistance.
The octane number came about as a result of research carried out in the 1920s and 30s by Sir Harry Ricardo ("The Internal Combustion Engine" 1925, 1935, and other books) and Charles Kettering (he also developed the distributor and coil ignition system).
Due to their research, the octane number for any gasoline is a comparison with a mixture of Iso-Octane and Heptane. 91 Octane has the knock resistance equivalent of mixing 91% Iso-Octane with 9% Heptane.
Currently, octane numbers are measured in two ways. The 'research' method of measuring the octane number uses a constant speed (1500 rpm) engine in laboratory conditions. This is the RON - Research Octane Number. The other method is the MON - Motor Octane Number, which uses the same test engine, but has a harsher test regime more closely related to road conditions. So the MON is usually lower than the RON for the same fuel.
Often you may see the octane rating quoted as (R+M)/2. This means an average of the two methods is used to give the fuel a number. This number method is often called 'pump octane' or AKI (anti-knock index) in the US.

Hope that is what you were asking for.

 

[Monagas]

Thank you Mr.Eltron,

I really apreciate your reply and

i am absolutely agree with you.

We work with use Natural GAS engine-driven compressors,
I´m making an evaluation of the fuel gas quality,in order to improve our fuel gas treatment process. The only parameter that we take in account is the HHV and LHV.

The manufacturer of the engines gave us few recommendantions about the "n-butane number", and the theory (that is similar to others knock ratings in the US, RON, MON, Methane number, wobbe index etc,). But believe or not they don´t gave us the method of calculation.

Thanks anyway