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依据多孔介质传热学理论,建立了松散煤体氧化放热强度理论计算模型,组建了煤自燃氧化放热强度实验测试系统,在测试煤体导热系数及比热等参数的基础上,分别测试了不同变质程度、不同粒度煤体的氧化放热强度.结果表明:氧化放热强度均随温度升高而增大,在60~70℃前缓慢上升,之后迅速增大,且与温度呈指数关系;变质程度越低、自燃倾向性越高的煤体,氧化放热强度越大,随动态吸氧量的增加而增大;相同温度下,煤体粒度越大,其氧化放热强度越小.通过实验证明该测试系统研究结果准确可靠,实现了快速测试的目标.
According to the theory of heat transfer in porous media, a theoretical calculation model of the oxidative exothermic strength of loose coal was set up and an experimental system was established to measure the exothermic intensity of coal spontaneous combustion. Based on the test of thermal conductivity and specific heat of coal, The results showed that the exothermic oxidation intensity increased with the increase of temperature and slowly increased from 60 to 70 ℃ and then rapidly increased with the increase of temperature Relationship; the lower the degree of metamorphism, the higher the spontaneous combustion tendency of coal, the greater the exothermic oxidation intensity, with the increase of dynamic oxygen absorption increases; the same temperature, the greater the particle size of coal, the more its exothermic oxidation strength Experimental results show that the test system is accurate and reliable, achieving the goal of quick test.