Experimental study on the effect of preinhibition pressure on the inhibition of coal spontaneous combustion

IF 3.4 3区 工程技术 Q2 ENGINEERING, CIVIL Fire Safety Journal Pub Date : 2024-08-05 DOI:10.1016/j.firesaf.2024.104235
Baolong Guo , Yuntao Liang , Wei Wang , Guansheng Qi , Yong Sun , Zhenzhen Zhao , Xinfeng Cui
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Abstract

A pressurized inhibition method is proposed based on the pre-inhibition process to study the inhibition law and mechanism of the pre-inhibition pressure on the coal spontaneous combustion, with a purpose of enhancing the inhibiting effect of chloride salt inhibitors. In this work, inhibited coal samples were prepared by immersing raw coal in high-temperature and high-pressure reactor at 1 MPa, 2 MPa, 3 MPa, 4 MPa, and 5 MPa, respectively, using MgCl2 solution with a mass concentration of 20 %. The variation rules of the characteristic parameters, such as the indicator gas concentration, inhibition rate, surface microscopic morphology, and reactive groups, of various coal samples with the elevation of the pre-inhibition pressure were investigated using the programmed temperature-raising oxidation system, infrared spectroscopy, and SEM. It was found that the pre-inhibition pressure was in the range of 1–4 MPa, and with the increase of pre-inhibition pressure, the gas-producing concentration and the content of active groups of coal decreased, and the inhibition rate increased significantly. Increasing the pre-inhibition pressure can significantly improve the inhibition effect, and the optimum pre-inhibition pressure is 4 MPa. Continuing to increase the pre-inhibition pressure will destroy the pore structure of the coal and reduce the inhibition effect.

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预抑制压力对煤炭自燃抑制作用的实验研究
提出了一种基于预抑制过程的加压抑制方法,研究预抑制压力对煤自燃的抑制规律和机理,以期增强氯盐抑制剂的抑制效果。本研究采用质量浓度为 20% 的氯化镁溶液,将原煤分别浸入 1 MPa、2 MPa、3 MPa、4 MPa 和 5 MPa 的高温高压反应器中,制备了抑制煤样。利用程序升温氧化系统、红外光谱和扫描电镜研究了各种煤样的指示气体浓度、抑制率、表面微观形貌和反应基团等特征参数随预抑制压力升高的变化规律。结果发现,预抑制压力在 1-4 MPa 之间,随着预抑制压力的增加,煤的产气浓度和活性基团含量降低,抑制率显著增加。提高预抑制压力可明显改善抑制效果,最佳预抑制压力为 4 MPa。继续增加预抑制压力会破坏煤的孔隙结构,降低抑制效果。
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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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