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为了研究解吸附煤样的自燃特性,运用煤低温氧化试验系统测试了煤样在氮气条件下恒温解吸附及解吸附再次氧化升温特性,分析了解吸附过程的气体产物规律和解吸附煤样的自燃特性参数,研究原煤和解吸附煤样的氧化、放热特性。结果表明:恒温解吸附过程中产生CO、CO_2、CH_4气体,CO_2的气体产生量远大于CO、CH_4,随着箱温温度的升高,气体产量也增大;与原煤相比,恒温30℃和50℃解吸附煤样的耗氧速率、放热强度均小于原煤;在70℃之前,恒温70℃解吸附煤样与原煤的耗氧速率和放热强度相似,在90~110℃之间出现交叉温度点,交叉温度点之前原煤的耗氧速率、放热强度大于恒温70℃解吸附煤样,之后小于原煤,说明不同恒温解吸附过程对煤的自燃特性的影响具有一定的差异。
In order to study the spontaneous combustion characteristics of desorbed coal samples, the coal desulfurization desorption and desorption re-oxidation temperature characteristics under nitrogen were tested using the coal low temperature oxidation test system. The gas product law and the spontaneous combustion characteristics of desorbed coal samples were analyzed Parameters, study of coal and desorption samples of coal oxidation, exothermic characteristics. The results show that the gas production of CO, CO_2, CH_4 and CO_2 generated during the desorption is much larger than that of CO and CH_4. As the temperature increases, the gas yield also increases. Compared with the raw coal, And 50 ℃ desorption of coal samples oxygen consumption rate, the exothermic intensity is less than the raw coal; before 70 ℃, constant temperature desorption of coal samples with desorption of coal-like and raw coal oxygen consumption rate and exothermic intensity similar to between 90 ~ 110 ℃ At the crossing point, the oxygen consumption rate and the exothermic intensity of raw coal before the crossover temperature point desorb the coal sample more than the constant temperature of 70 ℃ and then smaller than that of the raw coal, indicating that the effect of different constant temperature desorption processes on the spontaneous combustion characteristics of coal has some differences.