灰分对煤自燃特性影响的实验研究

发布时间：2018-03-10 14:43

本文选题：煤自燃　切入点：灰分　出处：《重庆大学学报》2017年04期 　论文类型：期刊论文

【摘要】：为了研究灰分对煤自燃能力的影响作用,利用绝热氧化实验装置对不同灰分含量煤样进行升温氧化实验,采用R_(70)、T_(CPT)、B3种指标表征灰分含量对煤样自发氧化过程的影响。结果表明:1)灰分含量越大,煤样低温氧化阶段温升速率越小,温升加速点温度越高,煤样的自发氧化过程越慢,煤越不易自燃;灰分含量大于40%后,煤自燃倾向性快速减弱。温升加速点是反应微观信息的零活化能温度的宏观累计结果,具有直观且滞后的特点。灰分越大,滞后越明显,温差越大。2)R_(70)、T_(CPT)、B3种指标与灰分关系表现为二次函数。R_(70)和T_(CPT)两种指标显示灰分越大,自燃倾向性越弱,与实践经验相符。受水分权重影响,B指标显示煤样在灰分小于40%时,灰分越大,煤样自燃倾向性越强,这与实践经验相悖。因此,B在判定灰分对煤样自燃倾向性的影响时具有一定的局限性。
[Abstract]:In order to study the effect of ash content on coal spontaneous combustion ability, the temperature rise oxidation experiment of coal samples with different ash content was carried out by using adiabatic oxidation test device. The effect of ash content on the spontaneous oxidation process of coal samples was characterized by using the three indexes of Rast70 / T _ T _ T _ T _ B. The results showed that the higher the ash content, the smaller the temperature rise rate in the low temperature oxidation stage of coal samples, the higher the temperature acceleration point, the slower the spontaneous oxidation process of coal samples. When the ash content is greater than 40%, the tendency of spontaneous combustion of coal decreases rapidly. The acceleration point of temperature rise is the macroscopic accumulative result of zero activation energy temperature reflecting micro information, which has the characteristics of intuition and lag. The higher the ash content, the more obvious the lag is. The bigger the temperature difference is, the greater the temperature difference is, and the relationship between the three indexes and ash content shows that the higher the ash content is, the weaker the spontaneous combustion tendency is, and the more the ash content is, the more ash the coal sample has when the ash score is less than 40th, the higher the ash score is, the higher the ash score is, the higher the ash score is, the higher the ash score is, the higher the ash score is, the lower the ash content is, the weaker the spontaneous combustion tendency is, the higher the ash content is, the higher the ash score is, and the more the ash content is, the higher the ash score is. The stronger the tendency of spontaneous combustion of coal samples is, the more contrary to practical experience, therefore, the influence of ash content on the tendency of spontaneous combustion of coal samples has certain limitations.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;河南理工大学;
【基金】：国家自然科学基金青年基金资助项目(51204216) 博士点基金资助项目(20130191130003) 国家科技支撑计划资助项目(2012BAK04B09)~~
【分类号】：TD752.2

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