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变质作用是决定煤炭性质的主要因素,而变质程度指数就是挥发物产率V~(dal)。在顿巴斯,各种变质程度的煤炭都有。1946～1970年煤和瓦斯突出分布情况的统计分析证明:倾向突出煤层的煤炭变质程度的特征是挥发物的单位产率3.5～35％。突出地点的煤样具有挥发物产率值V~(dal)比较低及吸附能力增高的特征。 表中所示是近年在一些煤层发生过突出地点所取三组以上的煤样V~(dal)的测定结果。因为煤样灰分不超过10％(国家标准6382—80),所以对V~(dal)值不产生本质影响,平行测定资料之间的差别不超过1％,突出地点和普通地点的V~(dal)的差别不能认为是测定的错误。
Metamorphism is the main factor that determines the nature of coal, and the degree of deterioration is the volatility yield V dal. In Donbass, all kinds of deterioration of the coal have. Statistical analysis of coal and gas outburst distribution from 1946 to 1970 proves that the degree of coal metamorphism that is overriding coal seams is characterized by 3.5-35% of the unit yield of volatile matter. The coal samples with prominent sites have the characteristics of low volatility yield value V dal and higher adsorption capacity. The table shows the results of the measurement of V ~ (dal) over three sets of coal samples taken in some prominent coal seam sites in recent years. As the coal ash content does not exceed 10% (national standard 6382-80), so the value of dali does not have an essential effect, the difference between the parallel determination of data does not exceed 1%, highlight the location and ordinary locations V ~ ( dal) can not be considered as a measurement error.