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前 言 煤矿中煤的自燃一般来说是起因于煤层和采空区的缓慢氧化,在炭化程度低的褐煤、次烟煤中容易发生。予计今后开发煤矿要进一步依靠炭化程度低的煤炭,因而随之而来的便会增加煤自燃引起煤矿火灾的危险性。 美国矿业局最近对于自燃的研究,主要是以烟煤为对象,进而再扩大到褐煤,次烟煤,并研究了美国各种煤自热和外界空气温度,湿度条件的关系。此处所谓的自热温度就是指煤块在绝热条件下可能发生连续放热反应的最低温度。
Preface Spontaneous combustion of coal in coal mines is generally due to the slow oxidation of coal and goafs, which is prone to occur in lignites and sub-bituminous coal with a low degree of carbonization. In the future, coal mines should be further relied on for coal with a low degree of carbonization, so the ensuing increase of coal spontaneous combustion risks coal mines. Recent research on spontaneous combustion by the US Bureau of Mines focused on bituminous coal and further expanded to lignite and sub-bituminous coal, and studied the relationship between the various coal self-heating and ambient air temperature and humidity in the United States. The so-called self-heating temperature here refers to the coal block in adiabatic conditions may occur continuous exothermic reaction minimum temperature.