用于抑制煤炭自燃的包埋改性纳米磷酸锆抑制剂

IF 3.4 3区 工程技术 Q2 ENGINEERING, CIVIL Fire Safety Journal Pub Date : 2024-09-11 DOI:10.1016/j.firesaf.2024.104265
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引用次数: 0

摘要

通过异辛胺插层法,探索了一种用于煤炭自燃抑制的改性磷酸锆(MZrP)纳米抑制剂的合成与表征。利用氧化实验、傅立叶变换红外光谱和扫描电镜研究了不同煤样特征参数的变化规律。结果表明,插层改性后的 MZrP 在煤基体中的分散性增强。随着 MZrP 浓度的增加,煤中的耗氧率、产气浓度和活性基团含量明显下降,表观活化能和抑制效果显著提高。这种抑制作用的增强主要归因于两个机制。首先,MZrP 的亲水性使其在煤表面和内部孔隙中均匀分布,形成一个致密的碳化层。该层可有效保持水分并隔离氧气,从而增强物理抑制作用。其次,MZrP 抑制剂受热分解为磷酸及其磷酸衍生物,可有效捕捉煤中的 H- 和 -OH,加强对其活性自由基的灭活。经 6 wt% MZrP 处理的煤样抑制效果最佳,平均抑制率为 62.2%,同时煤气产生率和氧气消耗率也最低。
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Intercalation modified nano zirconium phosphate inhibitor for inhibiting coal spontaneous combustion

The synthesis and characterization of a modified zirconium phosphate (MZrP) nano-inhibitor for spontaneous coal combustion inhibition were explored through isooctylamine intercalation. Using oxidation experiment, FTIR and SEM, the variation rules of the characteristic parameters of the different coal samples were investigated. It was observed that MZrP exhibited enhanced dispersion within the coal matrix post-intercalation modification. As the MZrP concentration increased, there was a notable decrease in oxygen consumption rate, gas production concentration, and active group content in the coal, alongside a significant increase in apparent activation energy and inhibition efficacy. This enhanced inhibition is attributed to two primary mechanisms. Firstly, the hydrophilic nature of MZrP allows for its uniform distribution on the coal surface and within internal pores, creating a dense carbonized layer. This layer effectively retains moisture and isolates oxygen, enhancing physical inhibition. Secondly, MZrP inhibitor is thermally decomposed into phosphoric acid and its phosphoric acid derivatives, which can effectively capture the H- and -OH in the coal, and strengthens the inactivation of its reactive free radicals. The optimal inhibition was observed in coal samples treated with 6 wt% MZrP, exhibiting an average inhibition rate of 62.2 %, coupled with the lowest rates of gas production and oxygen consumption.

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来源期刊
Fire Safety Journal
Fire Safety Journal 工程技术-材料科学:综合
CiteScore
5.70
自引率
9.70%
发文量
153
审稿时长
60 days
期刊介绍: Fire Safety Journal is the leading publication dealing with all aspects of fire safety engineering. Its scope is purposefully wide, as it is deemed important to encourage papers from all sources within this multidisciplinary subject, thus providing a forum for its further development as a distinct engineering discipline. This is an essential step towards gaining a status equal to that enjoyed by the other engineering disciplines.
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