基于热力学解吸阈值的煤与瓦斯突出研究  

Study on coal and gas outburst by thermodynamic desorption threshold

作　　者：张学梅[1] 李东[1] 马青华[1] 郝静远 ZHANG Xuemei;LI Dong;MA Qinghua;HAO Jingyuan(Energy and Chemical Engineering Research Center,Xi’an Siyuan University,Xi’an 710038,China;School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安思源学院能源及化工大数据应用教学研究中心,陕西西安710038 [2]西安交通大学化工技术学院,陕西西安710049

出　　处：《煤矿安全》2023年第9期23-29,共7页Safety in Coal Mines

基　　金：陕西省教育厅2022年度一般专项科学研究计划资助项目(22JK0518)。

摘　　要：从热力学角度诠释煤的解吸过程,根据实测高阶构造煤和原生煤的系列等温吸附数据回归求得温度-压力-吸附方程(TPAE)的4个待定参数,将TPAE变形成类似克劳修斯-克拉佩龙方程的不定积分式,并求得等量吸附焓;将坚固性系数与解吸阈值的乘积定义为突出阈值(OT),并用于比较几种煤之间发生煤与瓦斯突出的难易程度。结果显示:吸附是可以自发进行的放热过程,解吸是不能自发进行的吸热过程;解吸所需的能量相当于让解吸阈值(DT);构造煤发生煤与瓦斯突出的可能性是原生煤的8.1倍;构造煤的解吸速率随单位时间的延长而非线性下降;外来输入的能量越大,解吸速率衰减得越快;爆破产生很大的能量,已远超突出阈值,更加容易诱发煤与瓦斯突出。The desorption process of coal is interpreted from the perspective of thermodynamics.The four pending parameters of temperature-pressure-adsorption equation(TPAE)were obtained by using the measured series isothermal adsorption data of high-order structural coal and primary coal.The TPAE is transformed into an indefinite integral formula similar to the Clausius-Clapeyron equation,and an isosteric adsorption enthalpy is obtained.The product of the firmness coefficient and the desorption threshold is defined as the outburst threshold(OT),and is used to compare the difficulty of the coal and gas outburst between several types of coal.The results show that adsorption is a spontaneous heat release process,and desorption is not a spontaneous heat absorption process.The external energy required for desorption is equivalent to the threshold for desorption to occur.The desorption threshold(abbreviated as DT)is the unit isosteric desorption enthalpy.Through calculation,the occurrence of structural coal is 8.1 times more likely of coal and gas outburst than primary coal.The desorption rate of structural coal is no-linearly decreased with unit time.The greater the external energy,the faster the desorption rate decays.Blasting produces a large amount of external energy,immediately beyond the OT.It is,therefore,easier to induce coal and gas outburst.

关 键 词：单位等量解吸焓 解吸阈值 坚固性系数 突出阈值 解吸速率 

分 类 号：TD712[矿业工程—矿井通风与安全]