不同温度提质褐煤在水分复吸后的自燃特性变化

发布时间：2018-06-03 05:46

  本文选题：热提质 + 自燃特性　； 参考：《煤炭工程》2016年10期

【摘要】：基于雨雪天气后低阶煤焦自燃高发的现象,采用固定床管式炉在105~800℃范围内对褐煤提质,提质新鲜样(SA)及其水分复吸样(SC)分别在程序升温装置中进行自燃测定,分析自燃特性变化。结果显示,水分复吸使SC的临界温度吸氧量比SA降低60%以上。与SA不同,SC的吸氧量在低温氧化阶段很小且存在波动,在加速氧化阶段产生短暂"平台"期。SC在加速氧化阶段的瞬时升温速率(θ)比SA增加更快,自热温升加速。FCC指标显示,200~400℃提质的SC,自燃倾向性比SA显著增加,与SA-105接近,即高湿度环境储存会抵消提质降低褐煤自燃倾向性的效果。
[Abstract]:Based on the phenomenon of high spontaneous combustion of low rank char after rain and snow weather, a fixed bed tube furnace was used to measure the quality of lignite, fresh sample SAand its moisture reabsorption sample SC) in a temperature-programmed heating device. The change of spontaneous combustion characteristics is analyzed. The results showed that the oxygen uptake of SC at critical temperature was reduced by more than 60% compared with SA. Different from SA, the oxygen uptake of SC is very small and fluctuating at low temperature, and the instantaneous heating rate (胃) of SC in accelerated oxidation stage is faster than that in SA stage, and the transient "platform" phase (胃) of SC in accelerated oxidation stage is increased faster than that of SA. The self-heating temperature-rising accelerated .FCC index showed that the spontaneous combustion tendency of SCS at 400 鈩，

本文编号：1971693