不同应力对煤自然氧化的影响规律试验研究
Experimental study on the influence law of different stresses on coal autoxidation
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摘要: 为研究应力对煤自然氧化的影响规律，设计1套应力对煤自然氧化影响规律试验装置，通过该试验装置对煤样施加不同应力模拟采空区破碎煤体在承压环境中受压变形、温度及气体体积分数变化特征，定量分析不同应力作用下破碎煤体相关参数的变化规律。研究结果表明：升应力作用阶段破碎煤体较恒应力作用阶段受压变形、升温幅度更为明显且煤体升温速率与位移变化速率大小正相关，进一步验证了应力对于煤体自然氧化具有促进作用；破碎煤体在不同应力作用下煤自燃倾向性进一步加剧，煤体内分子更易氧化，从而导致CO、CH4的产生；根据试验所测CO体积分数，从而推断有煤氧复合反应和煤体机械破碎激活脱碳2种产生途径。Abstract: In order to study the influence of stress on the coal autoxidation, a set of test device was designed for the influence law of stress on coal autoxidation. Through this test device, different stresses were applied to coal samples to simulate the characteristics of pressure deformation, temperature and gas concentration of fragmentized coal in goaf in the pressure environment, and the change laws of relevant parameters of fragmentized coal under different stresses were quantitatively analyzed. The research results indicate that the compressive deformation and temperature rise range of fragmentized coal in the stage of rising stress are more obvious than that in the stage of constant stress and the temperature rise rate of coal is positively correlated with the displacement change rate, which further verifies that the stress can promote the coal autoxidation; under different stresses, the spontaneous combustion tendency of fragmentized coal is further intensified, and the molecules in coal are easier to oxidize, which leads to the production of CO and CH4 ; according to the volume fraction of CO measured by the test, it is inferred that there are two ways to produce carbon dioxide, including coal oxygen compound reaction and activated decarburization of coal by mechanical crushing.
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Keywords:
- fragmentized coal /
- stress /
- CO /
- autoxidation /
- coal spontaneous combustion
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