Investigation of the effect of different distilled water, rainwater and seawater mass ratios on coal spontaneous combustion characteristics

蒸馏水 化学 自燃 雨水收集 热重分析 海水 煤燃烧产物 煤炭能源价值 吸附 含水量 化学工程 燃烧 挥发 傅里叶变换红外光谱 环境化学 有机化学 色谱法 地质学 生态学 海洋学 岩土工程 工程类 生物
作者
Hao Liu,Zenghua Li,Yongliang Yang,Guodong Miao,Purui Li,Guoqin Wang
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:900: 165878-165878 被引量:21
标识
DOI:10.1016/j.scitotenv.2023.165878
摘要

When water comes into contact with coal, the risk of coal spontaneous combustion should be reassessed. In order to analyze the effect of distilled water, rainwater and seawater on the coal self-heating, thermogravimetric analysis (TGA) was applied to investigate the differences between the macroscopic oxidation properties of raw coal and water-immersed coal. The risk of coal spontaneous combustion increases after water immersion, but different types of water have different degrees of influence on the spontaneous combustion of coal. The microscopic pore structure and elemental changes on the surface of coal samples before and after water immersion were studied by Scanning Electron Microscope (SEM), low-pressure nitrogen gas adsorption (LP-N2GA) and Energy Dispersive Spectroscopy (EDS) experiments. Fourier infrared spectroscopy (FTIR) was used to investigate the change of active groups. The results show that the pore structure of coal samples immersed in water is much more developed than that of raw coal. In the low-temperature oxidation stage, moisture evaporation consumes much oxidation heat and inhibits the coal self-heating. After the stage, it promotes the coal spontaneous combustion. The content of the hydroxyl group increases, and the content of carbonyl and carboxyl decreases. The alkali metal elements can act as catalysts and active carriers of oxygen, enhancing the oxidation activity of coal. The results are helpful to understand the mechanism of different distilled water, rainwater and seawater mass ratios on coal spontaneous combustion and avoid potential self-heating after immersion.
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