预氧化不粘煤自燃过程热输运特性研究  

Study on thermal transport characteristics of pre-oxidized non-caking coal during spontaneous combustion

作　　者：任帅京 尹岚 肖旸 何骞 屈高阳 王津睿 REN Shuaijing;YIN Lan;XIAO Yang;HE Qian;QU Gaoyang;WANG Jinrui(College of Energy Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Shaanxi Key Laboratory of Prevention and Control of Coal Fire,Xi’an 710054,China;China Coal Science and Engineering Ecological Environment Technology Co.,Ltd.,Beijing 100013,China)

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西安科技大学安全科学与工程学院,陕西西安710054 [3]陕西省煤火灾害防治重点实验室,陕西西安710054 [4]中煤科工生态环境科技有限公司,北京100013

出　　处：《陕西煤炭》2023年第3期18-23,共6页Shaanxi Coal

基　　金：国家自然科学基金项目(52074215,52204239);陕西省自然科学基础研究计划项目(2022JQ-517);中国博士后科学基金项目(2022M722557)。

摘　　要：为了探究煤氧化后微观基团变化对热输运特性的影响,选用不粘煤作为研究对象,运用程序升温装置将其氧化升温至90℃、150℃、210℃和300℃,采用傅里叶红外光谱仪和激光导热仪分别测定5种煤样的官能团分布及热物性参数的变化,并通过皮尔逊相关分析法得到氧化煤中微观基团与煤热输运特性之间的关联性。结果表明,随着温度的升高,原煤及氧化煤热扩散系数均先降低后升高,比热容先迅速增大后趋于稳定,导热系数先缓慢增加后快速增加。氧化煤的比热容均低于原煤的比热容,预氧化温度为150℃煤样的热扩散系数及导热系数最大。随着氧化温度的升高,氧化煤中羟基—OH含量逐渐减少,煤中含氧官能团—CO—O—和C—O含量缓慢增加,含氧官能团和羟基是影响煤热物理特性的主要因素。To explore the influence of micro-groups change on thermal transport characteristics after coal oxidation,non-caking coal was chosen as the research object.The coal samples were oxidized at 90℃,150℃,210℃,and 300℃using temperature programmed device.The distribution of functional groups and changes in thermal properties parameters of five coal samples were measured using Fourier infrared spectroscopy and laser thermal conductivity analyzer,respectively.The correlation between micro-groups in oxidized coal and coal thermal transport characteristics was obtained through Pearson correlation analysis.The results revealed that with the increase of temperature,thermal diffusivity of raw and oxidation coals first decreases and then increases.The specific heat capacity first increases rapidly and then tends to stabilize,and the thermal conductivity enhanced slowly and then increased rapidly.The specific heat capacity of oxidation coals was lower than that of raw coal,the coal sample with a pre-oxidation temperature of 150℃has the highest thermal diffusivity and thermal conductivity.With the increase of oxidation temperature,the content of hydroxyl(—OH)in oxidation coals reduced,and the oxygen-containing functional groups(—CO—O—and C—O)in coals increased slowly.Oxygen-containing functional groups and hydroxyl groups are the main factors affecting the thermophysical properties of coal.

关 键 词：预氧化煤 煤自燃 氧化升温 微观基团 热传输 

分 类 号：TD752[矿业工程—矿井通风与安全]