基于交叉点温度法煤自燃倾向性评定指标的物理内涵

发布时间：2019-06-18 19:08

【摘要】：为了探索基于传统交叉点温度法建立的煤自燃倾向性评定指标的物理本质和相互间联系,对线性升温环境中具反应活性固体样品热响应进行理论模拟,同时跟踪含水量对交叉点温度(CPT)以及衍生指标HR和FCC结果的影响。结果显示,线性升温环境中样品中心温度呈典型变化,即初期线性升温、缓慢升温和后续急剧升温3个阶段。计算结果与现有的实验数据高度吻合。随着样品含水量的增加,其CPT温度升高,表明样品自加热和自燃倾向性降低;而指标HR和FCC的评定结果却相反。进一步分析表明,CPT温度间接表征样品走向显著氧化和自加热的起始(临界)温度,反映样品发生氧化自加热的难易程度,可以作为评定材料自加热和自燃倾向性的主要指标。指标HR和FCC是对处于CPT温度情形下样品产热能力的表征,与材料原始状态下的属性没有直接关联,因而只适合在CPT测试结果接近时对样品间自加热和自燃倾向性差异进行补充评定。
[Abstract]:In order to explore the physical essence and relationship of coal spontaneous combustion tendency evaluation index based on traditional intersection temperature method, the thermal response of reactive solid samples in linear heating environment was simulated theoretically, and the effects of water content on intersection temperature (CPT) and derivative indexes HR and FCC were followed up. The results show that the central temperature of the sample in the linear heating environment shows a typical change, that is, the initial linear temperature rise, the slow heating stage and the subsequent sharp heating stage. The calculated results are in good agreement with the existing experimental data. With the increase of water content, the CPT temperature increased, indicating that the self-heating and spontaneous combustion tendency of the sample decreased, while the evaluation results of HR and FCC were the opposite. Further analysis shows that CPT temperature indirectly represents the initial (critical) temperature of oxidation and self-heating of samples, which reflects the difficulty of oxidation and self-heating of samples, and can be used as the main index to evaluate the tendency of self-heating and spontaneous combustion of materials. The indexes HR and FCC are the characterization of the thermal production capacity of the samples at CPT temperature, which are not directly related to the properties of the original state of the material, so they are only suitable for supplementary evaluation of the difference of self-heating and spontaneous combustion tendency between samples when the CPT test results are close.
【作者单位】：中国科学技术大学火灾科学国家重点实验室;
【分类号】：TD752.2

【共引文献】