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为进一步揭示煤低温氧化机理、指导煤矿安全开采过程中的煤自燃火灾防治工作,根据CO,CO2是煤低温氧化的主要气体产物这一反应特性,同时CO是判断煤自燃程度的重要指标性气体这一工程实际,采用恒温试验方法研究某烟煤在30℃,50℃和70℃解吸附和解吸附后再氧化过程中的CO,CO2气体产物的产生特性。研究结果表明,新鲜煤中就存大量活泼的络合物,并且这种络合物在高于常温的情况下就可以自身发生分解,产生的主要气体产物为CO2,在较高的温度下,CO的生成量才逐渐增加;在煤的低温氧化阶段,煤与氧气发生的化学反应并不强烈,气体产物CO和CO2主要由络合物分解产生。因此,在煤自燃火灾防治时要及时控制煤在低温情况下,由于络合物分解放热而使煤温逐渐升高从而导致自燃发生。
In order to further reveal the mechanism of coal low temperature oxidation and guide the coal spontaneous combustion fire prevention and control in coal mine safety exploitation process, according to CO, CO2 is the reaction characteristic of the main gas products of low temperature oxidation of coal, and CO is an important index gas to judge the spontaneous combustion of coal In this project, the production characteristics of CO, CO2 gas products during the reoxidation of a bituminous coal after desorption and desorption at 30 ℃, 50 ℃ and 70 ℃ were studied by the thermostatic test. The results show that a large number of lively complexes exist in fresh coal, and the complex can decompose itself at higher than normal temperature, resulting in the main gaseous product of CO2. At higher temperatures, The production of CO gradually increased; in the low-temperature oxidation stage of coal, the chemical reaction between coal and oxygen is not strong, and the CO and CO2 gas products are mainly decomposed by the complex. Therefore, in the prevention and control of coal spontaneous combustion of coal in a timely manner to control the case of low temperature, due to decomposition of complex heat and make the coal temperature gradually increased, leading to spontaneous combustion.