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采空区遗煤在水浸环境下的自燃危险性显著变化。为探究含水率对遗煤自燃及放热特性的影响，采用程序升温试验、热物性测试及红外光谱技术，对5种含水率(质量分数为3.10%、5.48%、6.93%、12.20%、17.10%)不黏煤的自燃特性、热物性参数及官能团演变规律进行了研究。结果表明：随着含水率增加，煤样的CO产生量、耗氧速率及放热强度呈先升高后降低趋势，含水率为6.93%时，煤氧反应速率最大；含水率升高使比热容增大，热扩散系数与导热系数减小，降低了煤体热量扩散与传导效率；煤样中—OH的质量分数随含水率升高而增加，—CH2和C=O的质量分数先增后减，C=C的质量分数基本不变。含水率通过三大机制影响煤自燃进程：(1)改变关键官能团和活性位点的数量，调控链式反应强度；(2)影响热物性参数，改变煤体间热量的扩散、储存与传递效率；(3)重塑煤体的孔隙结构，调节煤氧接触面积。研究可为采空区水浸环境下遗煤自燃预测预报提供参考。
Abstract：The risk of spontaneous combustion in residual coal within goafs varies significantly under water-immersed conditions. To investigate the effects of moisture content on the spontaneous combustion behavior and exothermic characteristics of residual coal, programmed temperature-rise experiments, thermophysical property tests, and infrared spectroscopy were conducted. This study examined the spontaneous combustion characteristics, thermophysical parameters, and evolution of functional groups in non-caking coal with five different moisture contents(mass fractions of 3.10%, 5.48%, 6.93%, 12.20%, and 17.10%). The experimental results indicate that, as moisture content increases, the production of CO, oxygen consumption rate, and heat release intensity of the coal samples initially increase and then decrease. The coal sample with a moisture content of 6.93% exhibits the highest coal-oxygen reaction rate. Additionally, increasing moisture content leads to an increase in specific heat capacity, while decreasing thermal diffusivity and thermal conductivity, thereby reducing the efficiency of heat diffusion and conduction within the coal matrix. Regarding the functional groups in the coal samples, the mass fraction of —OH increases with rising moisture content, while those of —CH2 and C=O initially increase and then decrease. The mass fraction of C=C remains relatively stable. Moisture content influences the spontaneous combustion process of coal through three key mechanisms:(1) modifying the quantities of essential functional groups and active sites, thereby regulating the intensity of chain reactions;(2) affecting thermophysical parameters and altering the efficiency of heat diffusion, storage, and transfer within the coal matrix;(3) reshaping the pore structure of the coal, thereby adjusting the contact area between coal and oxygen. This study provides valuable insights for predicting the spontaneous combustion of residual coal in water-immersed goaf environments.
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基本信息:
DOI：10.13637/j.issn.1009-6094.2025.1207
中图分类号:TD752.2
引用信息:
[1]马砺,郭杨杨,刘红亮,等.含水率对不黏煤自燃特性及热物性参数的影响研究[J].安全与环境学报,2026,26(07):2598-2606.DOI:10.13637/j.issn.1009-6094.2025.1207.
基金信息:
国家自然科学基金项目(52174206); 消防科学与技术创新团队项目(2023-CX-TD-42); 陕西省自然科学基础研究计划项目(2024JC-YBQN-0377)
2026-03-24
2026-03-24
2026-03-24