Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Chemical analysis
Patent
1997-09-17
2000-05-09
Wachsman, Hal
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Chemical analysis
702 23, 702 22, 702 50, 73 3501, 73 3502, 73 2331, G01L 2322
Patent
active
060616377
ABSTRACT:
A method for calculating knock resistance ratings for various blends of non-commercial grade natural gas involves the use of a computer model derived from collecting experimental data for constituent concentration levels typical in field grade natural gas. The computer model is derived using a MN (methane number) calibration curve for various natural gas compositions typical at the wellhead. The empirically-derived computer model considers concentrations of the following molar constituents: methane (60%-100%); ethane (0%-20%); propane (0%-40%); normal butane (0%-10%); normal pentane (0%-3%); mixtures of higher order hydrocarbons (0%-2%); nitrogen (0%-15%) and carbon dioxide (0%-10%). The knock characteristics of isomers of butane and pentane are accounted for by assigning fractions of their concentrations to concentrations of modeled constituents. If the concentration levels lie outside of acceptable ranges and normalization is insufficient to correct for concentration levels, an alternative method (preferably the carbon-hydrogen ratio method) is used to calculate knock resistance rating. Excessive concentrations of inert gases such as carbon dioxide and nitrogen are accounted for separately using an empirically-based algorithm, thus the model can be extended to landfill and digester gases which typically have high concentrations of carbon dioxide.
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Callahan et al. "Engine Knock Rating of Natural Gases--Methane Number," The American Society of Mechanical Engineers, 93-ICE-18, pp. 1-12, Jan. 1993.
"The Evaluation of the Antiknocking Property of Gaseous Fuels By Means of the Methane Number and its Practical Application to Gas Engines", Dr. M. Leiker et al., pp. 1-27, (No date).
"Engine Knock Rating of Natural Gases--Methane Number", T. Callahan et al., The American Society of Mechanical Engineers, 93-ICE-18, pp. 1-12, Jan. 1993.
Kakoczki Richard J.
Peffer John E.
Sorge Gregory W.
Dresser Industries Inc.
Wachsman Hal
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