Methane number calculation method and methane number measuring apparatusThe present invention relates to a methane number calculating method and a methane number measuring apparatus.In recent years, development and introduction of gas engines using liquefied natural gas (LNG) as a marine fuel have been progressing for the purpose of suppressing emission of nitrogen oxides (NO x ) and reducing CO 2 emission. The methane number of the gas being examined is calculated from the measured value of basic calorific value of the gas being examined and from the specific relationship. In the present invention, a specific relationship between methane number and basic calorific value is acquired in advance with respect to multiple reference gases which each consist of natural gas and which differ in methane number, and the basic calorific value of a natural gas to be examined is determined. The purpose of the present invention is to provide: a method for methane number calculation with which a probably reliable methane number of a natural gas to be examined can be easily obtained regardless of the composition of the gas and a device for methane number determination with which it is possible to monitor the fuel properties of a natural gas being used as a fuel gas.
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