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

中国安全科学学报 Pub Date : 2020-04-28 DOI:10.16265/J.CNKI.ISSN1003-3033.2020.04.010

Lou Hezhuang, Jiang Tinggui

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引用次数: 6

Abstract

In order to explore spontaneous combustion characteristics in low temperature oxidation process of coal after absorption in CO2 and N2 atmospheresꎬ with anthracite coal in No. 9 coal seam of Sihe No. 2 mine taken as research objectꎬ 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. Thenꎬ a physical adsorption model of different gas moleculesꎬ such as O2ꎬ CO2 and N2ꎬ was established on the surface of coal macromoleculesꎬ and adsorption of O2 gas molecules was analyzed from a micro perspective using grand canonical Monte Carlo simulation (GCMC) method. Finallyꎬ 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 atmospheresꎬ with concentration 第 4 期娄和壮等: 惰性气氛对煤自燃过程的竞争吸附差异性研究 of CO and CH4 gas products being reduced and rate of weight loss of coal spontaneous combustion decreasingꎬ thus inhibiting low temperature oxidation capacity of coal. The mixed adsorption of coal macromolecules on gas moleculesꎬ like CO2 and N2ꎬ suppresses their adsorption of O2 molecules. And gas competitive adsorption on coal surface ranks as H2O>CO2>N2>O2>CH4>CO.

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稀有气体气氛中煤自燃过程的竞争吸附差异

为探讨煤在CO2和N2大气中吸收后低温氧化过程中的自燃特性ꎬ，以四河二矿9号煤层无烟煤为研究对象ꎬ进行了煤在低温氧化过程中的升温试验和热重试验，分析了煤在自燃过程中的气体生成物特性和CO、CH4的失重特性。然后ꎬ建立了不同气体分子ꎬ如O2ꎬCO2和N2ꎬ在煤大分子表面的物理吸附模型ꎬ，并采用大正则蒙特卡罗模拟(GCMC)方法从微观角度分析了O2气体分子的吸附。最后ꎬ讨论了混合气体分子在煤大分子表面竞争吸附的差异。研究表明，煤在CO2和N2气氛中吸附后，低温氧化过程中的自燃特性发生了变化ꎬ，浓度降低了CO和CH4气体产物，降低了煤的自燃失重速率ꎬ，从而抑制了煤的低温氧化能力。煤大分子对气体分子ꎬ如CO2和N2ꎬ的混合吸附抑制了它们对O2分子的吸附。煤表面气体竞争吸附顺序为H2O>CO2>N2>O2>CH4>CO。

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来源期刊

中国安全科学学报

CiteScore

1.30

自引率

0.00%

发文量

8733

期刊介绍： China Safety Science Journal is administered by China Association for Science and Technology and sponsored by China Occupational Safety and Health Association (formerly China Society of Science and Technology for Labor Protection). It was first published on January 20, 1991 and was approved for public distribution at home and abroad. China Safety Science Journal (CN 11-2865/X ISSN 1003-3033 CODEN ZAKXAM) is a monthly magazine, 12 issues a year, large 16 folo, the domestic price of each book is 40.00 yuan, the annual price is 480.00 yuan. Mailing code 82-454. Honors: Scopus database includes journals in the field of safety science of high-quality scientific journals classification catalog T1 level National Chinese core journals China Science and technology core journals CSCD journals The United States "Chemical Abstracts" search included the United States "Cambridge Scientific Abstracts: Materials Information" search included