Experimental Study on Spontaneous Combustion of Low Rank Coal Containing High Sulfur in Goaf Atmosphere

IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY
Nan Jia
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Abstract

To study the effect of pyrite on coal spontaneous combustion characteristics in low-rank coal under an oxygen atmosphere in goaf, this paper selected PZ brown coal impregnated with pyrite and its reaction products and monitored the changes in the generation of characteristic gases CO and CO2 during the programmed heating process of coal samples. The experiment found that oxygen concentration has the greatest impact on the spontaneous combustion characteristics of coal with added Fe3+. When the oxygen concentration in goaf coal increases to 9%, the promotion rate of high sulfur coal spontaneous combustion is the highest, which easily increases the range of goaf spontaneous combustion risk areas. When the temperature rises to 60°C, the catalytic effect of pyrite reaction products on coal spontaneous combustion is greatly enhanced. Through FTIR testing, it was found that Fe3+ ions, as strong oxidative free radicals, promote the reaction of –CH2–, –COOH, and –OH in coal at low oxygen concentrations, leading to a further increase in the tendency of coal to self ignite at low oxygen concentrations.

Abstract Image

高硫低阶煤在沼气中自燃的实验研究
为研究黄铁矿对羊肠小道氧气氛下低阶煤自燃特性的影响,本文选取了浸渍黄铁矿及其反应产物的PZ褐煤,监测了煤样程序加热过程中特征气体CO和CO2的生成变化。实验发现,氧浓度对添加了 Fe3+ 的煤的自燃特性影响最大。当羊草煤中氧浓度增加到 9% 时,高硫煤自燃促进率最高,容易增加羊草自燃危险区范围。当温度升至 60℃时,黄铁矿反应产物对煤自燃的催化作用大大增强。通过傅立叶变换红外测试发现,Fe3+离子作为强氧化自由基,在低氧浓度下会促进煤中-CH2-、-COOH、-OH的反应,导致煤在低氧浓度下的自燃倾向进一步增强。
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来源期刊
Solid Fuel Chemistry
Solid Fuel Chemistry CHEMISTRY, MULTIDISCIPLINARY-ENERGY & FUELS
CiteScore
1.10
自引率
28.60%
发文量
52
审稿时长
6-12 weeks
期刊介绍: The journal publishes theoretical and applied articles on the chemistry and physics of solid fuels and carbonaceous materials. It addresses the composition, structure, and properties of solid fuels. The aim of the published articles is to demonstrate how novel discoveries, developments, and theories may be used in improved analysis and design of new types of fuels, chemicals, and by-products. The journal is particularly concerned with technological aspects of various chemical conversion processes and includes papers related to geochemistry, petrology and systematization of fossil fuels, their beneficiation and preparation for processing, the processes themselves, and the ultimate recovery of the liquid or gaseous end products.
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