不同水分含量煤样氧化动力学研究
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摘要
为了研究水分对煤样氧化动力学研究的影响,对褐煤进行低温真空干燥,得到3种水分含量不同的煤样,分别对其进行程序升温实验,并对实验煤样的耗氧速率及其活化能进行分析,结果表明:不论何种煤样,其耗氧速率均随着氧化温度的升高基本呈指数型增长趋势,在某一特定的氧化温度下,耗氧速率随着煤样水分的降低而逐渐增大;随着煤体水分含量的增大,煤氧化过程中的表观活化能随之增大,煤的自燃特性会随着煤体中水分含量的增大而减弱;在工作面回采及封闭后保持煤体的湿润程度对预防煤炭自燃有着积极意义。
In order to study the influence of water on the oxidation kinetics of coal samples, lignite was treated by low-temperature vacuum drying to obtain lignite with different water content. The experimental coal samples were tested by three kinds of coal samples. The oxygen consumption rate and its activation energy were analyzed. The results show that:regardless of the coal sample, the oxygen consumption rate increases exponentially with the increase of oxidation temperature. At a certain oxidation temperature, oxygen consumption, the rate increases with the decrease of coal sample moisture; with the increase of coal water content, the apparent activation energy of coal oxidation process increases, and the spontaneous combustion characteristics of coal will decrease with the increase of the moisture content of coal vary;maintaining the wetness of the coal after mining and sealing on the working face have positive significance for preventing spontaneous combustion of coal.
In order to study the influence of water on the oxidation kinetics of coal samples, lignite was treated by low-temperature vacuum drying to obtain lignite with different water content. The experimental coal samples were tested by three kinds of coal samples. The oxygen consumption rate and its activation energy were analyzed. The results show that:regardless of the coal sample, the oxygen consumption rate increases exponentially with the increase of oxidation temperature. At a certain oxidation temperature, oxygen consumption, the rate increases with the decrease of coal sample moisture; with the increase of coal water content, the apparent activation energy of coal oxidation process increases, and the spontaneous combustion characteristics of coal will decrease with the increase of the moisture content of coal vary;maintaining the wetness of the coal after mining and sealing on the working face have positive significance for preventing spontaneous combustion of coal.
引文
[1]邓军,邓寅,张玉涛,等.含水率对煤二次氧化自燃特性影响的实验研究[J].西安科技大学学报,2016,36(4):451-456.
[2]张卫亮,于涛,杨晓丹,等.褐煤在不同水分情况下氧化气体生成规律的探讨[J].煤矿安全,2009,40(1):75-76.
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[5]张磊,陆超,汪后港,等.水分对煤炭低温氧化温升特性影响的研究[J].煤炭技术,2016,35(12):198-199.
[6]张玉涛,王都霞,仲晓星.水分在煤低温氧化过程中的影响研究[J].煤矿安全,2007(11):1-4.
[7]魏子淇.水分对煤低温氧化特性参数的影响研究[D].西安科技大学,2018.
[2]张卫亮,于涛,杨晓丹,等.褐煤在不同水分情况下氧化气体生成规律的探讨[J].煤矿安全,2009,40(1):75-76.
[3]何启林,王德明.煤水分含量对煤吸氧量与放热量影响的测定[J].中国矿业大学学报,2005(3):358-362.
[4]雷丹,王德明,仲晓星,等.水分对煤低温氧化耗氧量影响的研究[J].煤矿安全,2011,42(7):28-31.
[5]张磊,陆超,汪后港,等.水分对煤炭低温氧化温升特性影响的研究[J].煤炭技术,2016,35(12):198-199.
[6]张玉涛,王都霞,仲晓星.水分在煤低温氧化过程中的影响研究[J].煤矿安全,2007(11):1-4.
[7]魏子淇.水分对煤低温氧化特性参数的影响研究[D].西安科技大学,2018.