Is the mixture flammable or non-flammable?

The answer to this question depends on the specific components in the gas mixture and their proportions. In the example you provided, the mixed gas contains 90% nitrogen, and nitrogen is non-flammable. However, hydrogen and hydrocarbons are flammable. If the proportion of combustible components in the gas mixture is high enough, and there is sufficient oxygen to support combustion, then such a mixture can be considered flammable. However, if the proportion of flammable components is very low, or there is not enough oxygen, then the mixture may be non-flammable. In your example, if the remaining 10% contains sufficient hydrogen and hydrocarbons, along with enough oxygen, then the mixture may be flammable. However, if the ratio of hydrogen to hydrocarbons is very low, or if there isn’t enough oxygen, then the mixture may be non-flammable. Therefore, the most accurate answer may need to be determined through experiments or further information. .

It can be determined using the methods specified in the standard GB/T 34710.3-2018 Classification of Gases – Part 3: Classification by Flammability. A hydrogen content in nitrogen of over 5.5% (by volume) constitutes flammability ； When other combustible components are present, the calculation and determination can be carried out according to the methods specified in the standards.

GB/T34710.3-2018 provides detailed calculation procedures; hydrogen with a 10% concentration is a flammable gas in a nitrogen environment. For detailed calculations, the flammable components must be specified in order to make a determination

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