不同变质程度煤的吸附瓦斯动力学特性实验研究  

Experimental study on kinetic characteristics of gas adsorption of coal with different degrees of metamorphism

作　　者：王梦露 沈永星 周动 王辰[2,3] 王金鑫 冯雪健 WANG Menglu;SHEN Yongxing;ZHOU Dong;WANG Chen;WANG Jinxin;FENG Xuejian(School of Safety and Emergency Management Engineering,Taiyuan University of Technology,Taiyuan 030002,China;Key Laboratory of In-situ Modified Mining,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;School of Safety Engineering,North China Institute of Science and Technology,Sanhe 065201,China)

机构地区：[1]太原理工大学安全与应急管理工程学院,山西太原030002 [2]太原理工大学原位改性采矿教育部重点实验室,山西太原030024 [3]华北科技学院安全工程学院,河北三河065201

出　　处：《煤矿安全》2024年第1期34-41,共8页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(12102293);国家自然科学基金面上资助项目(52274200)。

摘　　要：为了进一步揭示不同变质程度的煤在不同吸附压力下的动力学特征,利用自主研发的TQY-2型精密吸附仪和红外热成像装置对直径为8.5 mm的褐煤、焦煤和无烟煤煤样进行不同压力(0.2、0.4、0.6、0.8、1.0 MPa)下的宏观吸附试验和吸附压力为(0.3、0.6、0.9、1.2、1.5 MPa)的煤体细观结构吸附试验,利用准一级、准二级、颗粒内扩散、Elovich以及双常数等吸附动力学模型分析吸附瓦斯规律及机理。研究表明:对比5种吸附动力学模型,准二级吸附动力学模型适合表征褐煤和焦煤的吸附瓦斯过程,而无烟煤的最优模型为颗粒内扩散模型;随着吸附压力升高,褐煤和焦煤的准二级吸附速率常数k2逐渐增加,无烟煤的颗粒内扩散速率常数kp也逐渐增加,均呈正相关;吸附压力对煤样适合的动力学模型影响较小;在宏观吸附和基于红外热成像的煤体细观结构吸附实验下,煤样适合的动力学模型一致。In order to further reveal the dynamic characteristics of coal with different degrees of metamorphism under different adsorption pressures,the self-developed TQY-2 precision adsorption instrument and infrared thermal imaging device were used to conduct macroscopic adsorption tests on lignite,coking coal and anthracite coal samples with a diameter of 8.5 mm at different pressures(0.2,0.4,0.6,0.8,1.0 MPa)and the adsorption test of the mesoscopic structure of the coal body with adsorption pressures of(0.3,0.6,0.9,1.2,1.5 MPa),using quasi-primary and quasi-secondary adsorption kinetic models such as intra-particle diffusion,Elovich and double constant analyze the law and mechanism of adsorption gas.The results show that compared with five adsorption kinetics models,the quasi-secondary adsorption kinetics model is suitable for characterizing the adsorption gas process of lignite and coking coal,while the optimal model for anthracite is the intra-particle diffusion model;with the increase of adsorption pressure,the quasi-secondary adsorption rate constant k2 of lignite and coking coal gradually increased,and the intra-particle diffusion rate constant kp of anthracite coal also gradually increased,all of which were positively correlated;adsorption pressure has little effect on the dynamic model suitable for coal samples;under the macroscopic adsorption experiment and the mesoscopic structure adsorption experiment of coal body based on infrared thermography,the dynamic models suitable for different degrees of metamorphism are consistent.

关 键 词：不同变质程度 不同压力 瓦斯吸附 动力学 吸附速率 

分 类 号：TD712[矿业工程—矿井通风与安全]