惰性气氛对煤自燃过程的竞争吸附差异性研究

doi:10.16265/j.cnki.issn1003-3033.2020.04.010

中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (4): 60-67.doi: 10.16265/j.cnki.issn1003-3033.2020.04.010

惰性气氛对煤自燃过程的竞争吸附差异性研究

娄和壮¹, 贾廷贵² 副教授

1.辽宁工程技术大学安全科学与工程学院,辽宁阜新 123000;
2.内蒙古科技大学矿业与煤炭学院,内蒙古包头 014010

收稿日期:2020-01-16 修回日期:2020-03-20 出版日期:2020-04-28 发布日期:2021-01-27
作者简介:娄和壮(1995—),男,辽宁大连人,硕士研究生,研究方向为矿井火灾防治理论及技术。E-mail:qililhz0405@126.com。
基金资助:
辽宁省教育厅基金资助(LJ2017FAL002);辽宁省大学生创新创业训练计划项目(20171014700017)。

Competitive adsorption difference during coal spontaneous combustion process in noble gas atmosphere

LOU Hezhuang¹, JIA Tinggui²

1. School of Safety Science and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China;
2. Institute of Mining and Coal, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China

Received:2020-01-16 Revised:2020-03-20 Online:2020-04-28 Published:2021-01-27

摘要/Abstract

摘要： 为探究在CO₂与N₂气氛中吸附后的煤低温氧化自燃特性,以寺河2号井9号煤层无烟煤为研究对象,开展煤低温氧化程序升温试验与热重(TG)试验,分析煤自燃过程中CO和CH₄气体的产物特性与失重特性;建立煤大分子表面对O₂分子、CO₂分子与N₂分子等不同气体分子的物理吸附模型,应用巨正则系综蒙特卡罗模拟(GCMC)法,从微观角度分析煤表面对O₂气体分子的吸附作用,探讨混合气体分子在煤大分子表面的气体竞争差异性。研究表明:经CO₂与N₂气氛中吸附后的煤低温氧化自燃特性发生变化,CO和CH₄气体产物浓度减小,煤自燃失重速率降低,煤低温氧化能力受到抑制;煤大分子对CO₂与N₂等气体分子的混合吸附对其吸附O₂分子起到了抑制作用;煤大分子表面的气体竞争吸附排序如下:H₂O＞CO₂＞N₂＞O₂＞CH₄＞CO。

关键词: 煤自燃, 惰性气体, 热重(TG), 气体产物特性, 吸附竞争, 氧化能力

Abstract: In order to explore spontaneous combustion characteristics in low temperature oxidation process of coal after absorption in CO₂ and N₂ atmospheres, with anthracite coal in No. 9 coal seam of Sihe No. 2 mine taken as research object, warming test and TG test of coal during low temperature oxidation were conducted to analyze gas product characteristics and weight loss characteristics of CO and CH₄ during spontaneous combustion of coal. Then, a physical adsorption model of different gas molecules, such as O₂, CO₂ and N_2, was established on the surface of coal macromolecules, and adsorption of O₂ gas molecules was analyzed from a micro perspective using grand canonical Monte Carlo simulation (GCMC) method. Finally, difference in competitive adsorption between mixed gas molecules on surface of coal macromolecules were discussed. The research shows that spontaneous combustion characteristics of coal in low temperature oxidation process change after adsorption in CO₂ and N₂ atmospheres, with concentration of CO and CH₄ gas products being reduced and rate of weight loss of coal spontaneous combustion decreasing, thus inhibiting low temperature oxidation capacity of coal. The mixed adsorption of coal macromolecules on gas molecules, like CO₂ and N₂, suppresses their adsorption of O₂ molecules. And gas competitive adsorption on coal surface ranks as H₂O>CO₂>N₂>O₂>CH₄>CO.

Key words: spontaneous combustion of coal, noble gas, thermogravimetric(TG), gas product characteristics, adsorption competition, oxidation ability

中图分类号:

X936

娄和壮, 贾廷贵. 惰性气氛对煤自燃过程的竞争吸附差异性研究[J]. 中国安全科学学报, 2020, 30(4): 60-67.

LOU Hezhuang, JIA Tinggui. Competitive adsorption difference during coal spontaneous combustion process in noble gas atmosphere[J]. China Safety Science Journal, 2020, 30(4): 60-67.

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惰性气氛对煤自燃过程的竞争吸附差异性研究

Competitive adsorption difference during coal spontaneous combustion process in noble gas atmosphere

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