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Carbon dioxide sealing-based inhibition of coal spontaneous combustion: A temperature-sensitive micro-encapsulated fire-retardant foamed gel
Fuel ( IF 7.4 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.fuel.2020.117036
Di Xue , Xiangming Hu , Weimin Cheng , Mingyue Wu , Zhiang Shao , Yongsheng Li , Yanyun Zhao , Kun Zhang

Abstract In order to enhance the inhibition efficiency of inhibitor on spontaneous combustion of coal and optimize the grouting process of traditional foamed gel, a temperature-sensitive retardant microcapsule (TSRM) was prepared via encapsulation of polyphenols with paraffin. Using composite surfactant (CFA) as a foaming agent and Carbon dioxide (instead of the traditional N2) as the gas source, a small amount of TSRM was incorporated into the water glass solution as base material to prepare microcapsuled retardant foamed gel (CDSFG-TSRM). TSRM temperature sensitivity allows melting at 60 °C followed by the release of tea polyphenols, which extends the effective period of tea polyphenols and improves the inhibitory effect on spontaneous coal combustion. Due to the inorganic polycondensation reaction between carbon dioxide and water glass solution, the preparation process of the material reduces carbon dioxide emission as a greenhouse gas and achieves a rapid gelation process of the mixed solution without the addition of a crosslinking agent, hence simplifying the preparation process of foam gel. The combination of in-situ FTIR and TG-IR indicated that the extent of oxidation on the surface hydroxyls of the coal sample treated with CDSFG-TSRM was low and the concentration of ether bond was high. The characteristic absorption peak intensity of C–H structure and Carbon dioxide were obviously weakened, and the characteristic absorption peak of Carbon dioxide appears at a higher temperature. In addition, CDSFG-TSRM has the advantages of shorter extinguishing time, higher retardant efficiency and difficulty in re-ignition.

中文翻译:

基于二氧化碳密封的煤自燃抑制:一种温度敏感的微胶囊阻燃泡沫凝胶

摘要 为提高缓蚀剂对煤自燃的抑制效率,优化传统泡沫凝胶的注浆工艺,采用石蜡包封多酚制备了温敏缓凝剂微胶囊(TSRM)。以复合表面活性剂(CFA)为发泡剂,以二氧化碳(代替传统的N2)为气源,将少量TSRM掺入以水玻璃溶液为基料制备微胶囊阻燃发泡凝胶(CDSFG-TSRM) )。TSRM 温度敏感性允许在 60°C 熔化后释放茶多酚,延长了茶多酚的有效期,提高了对煤自燃的抑制作用。由于二氧化碳与水玻璃溶液发生无机缩聚反应,该材料的制备过程减少了二氧化碳作为温室气体的排放,实现了混合溶液的快速凝胶化过程,无需添加交联剂,从而简化了泡沫凝胶的制备过程。原位FTIR和TG-IR的结合表明CDSFG-TSRM处理的煤样表面羟基氧化程度低,醚键浓度高。C-H结构和二氧化碳的特征吸收峰强度明显减弱,二氧化碳的特征吸收峰出现在较高温度。此外,CDSFG-TSRM具有灭火时间短、阻燃效率高、不易复燃等优点。
更新日期:2020-04-01
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