WHAT is Methane Number (MN)?
The methane number is a vital fuel parameter that reflects the anti-knock performance of gaseous fuels. Determined by the chemical composition of natural gas and other combustible gas mixtures, this index varies according to the volume ratio of core components including methane, ethane, propane and butane. Evaluating a fuel’s knock resistance is essential for precise gas engine selection and reliable CHP system configuration.
The methane number adopts a standardized scoring benchmark: pure methane delivers excellent anti-knock capability and is defined with a maximum index of 100. In contrast, hydrogen features rapid combustion characteristics with poor knock resistance, corresponding to a methane number of 0. As a practical reference, a fuel mixture with a methane number of 80 offers the same anti-knock performance as a blended gas consisting of 80% methane and 20% hydrogen.
Notably, certain gas compositions can achieve a methane number above 100, thanks to superior anti-knock properties. Biogas is a typical high-performance fuel in this category, with its methane number commonly exceeding 100.
Methane Content of Common Gases
Blast-Furnace Gas
0.1% ~ 0.5%
Semi-Coke Gas
8.8% – 17.6%
Coal Bed Methane
80% ~ 99%
Powermax Energy Solutions
For Powermax Energy gas engine and CHP projects, the fuel methane number serves as a core evaluation indicator. It guides the targeted selection of matched engine models and technical configurations, ensuring stable combustion, safe operation and optimal overall system performance under actual fuel conditions.
For professional fuel adaptation consultation and engine selection support, feel free to get in touch with our sales team through the contact form on our official website.
