基于温升速率的煤自燃倾向性测定方法

Determination Method of Coal Spontaneous Combustion Tendency Based on Increasing Rate

为了准确判定煤炭真实条件下自燃倾向性,选取具有代表性的2种褐煤、2种烟煤及2种无烟煤在煤自燃测定装置上展开研究。研究结果表明,褐煤在低温缓慢氧化阶段、高温加速氧化阶段升温速率最快,烟煤次之,无烟煤最慢。利用热分析仪对煤样的着火温度进行了测定,发现褐煤着火温度最低,烟煤次之,无烟煤着火温度最高;综合评判煤自燃倾向性判定指数,I<200为强自燃倾向,200≤I≤400为中等自燃倾向,I>400为弱自燃倾向。

In order to judge the coal spontaneous combustion tendency under the real condition accurately,two kinds of lignite,two kinds of bituminous coal and two kinds of anthracite have been selected to research coal spontaneous combustion characteristics by using the measurement device of coal spontaneous combustion.The field experimental results showed that the lignite has the largest temperature oxidation heating rate in the low temperature slow oxidation phase and high temperature accelerated oxidation phase,while anthracite has the minimal.The ignition temperature of coal samples were determined using thermogravimetric analysis.The results indicated that lignite has the minimum ignition temperature,while anthracite has the highest ignition temperature.Comprehensive evaluation index of coal spontaneous combustion propensity is determined I 200 for strong spontaneous combustion tendency;200≤I≤400 for secondary spontaneous combustion tendency,and I 400 for weak spontaneous combustion tendency.