自燃是可燃物质在没有明火焰等火源的作用下，因受热或自身发热并蓄热所产生的自行燃烧现象。 按照发生的机理，自燃可大致分为以下七种类型： 氧化发热自燃。分子内含有双键的不饱和有机化合物，如浸油脂物质、褐煤等，具有能吸收空气中的氧而发生部分氧化的特性，产生的大量? Spontaneous combustion is a flammable material in the absence of a flame and other sources of fire, due to heat or their own heat and heat generated by the phenomenon of self-combustion. In accordance with the mechanism of occurrence, spontaneous combustion can be divided into the following seven types: oxidation of spontaneous combustion. Unsaturated organic compounds containing double bonds in the molecule, such as oil-impregnated substances, lignite, etc., have the ability to absorb oxygen in the air and undergo partial oxidation.