LDHs阻化剂对烟煤的阻化特性实验研究
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摘要
为了研究新型稀土类水滑石(LDHs)阻化剂对烟煤的阻化特性,采用西安科技大学自主研制的程序升温实验装置,对3种不同配比的LDHs与煤样进行混合然后升温,升温速率为0.3℃/min,从室温加热到180℃,在设定温度对样品在氧化过程中产生的气体进行分析,研究其阻化性能,主要包括耗氧速率、阻化率、表观活化能等参数。结果表明:3种配比的LDHs阻化性能各不相同,阻化率随温度发生变化,阻化性能LDHs-3>LDHs-1>LDHs-2。其中LDHs-3的阻化率最大为60%,表观活化能分别在2个阶段增加了5.4 k J和4.5 k J。LDHs能有效抑制抑制CO释放,使临界温度、干裂温度增加,耗氧速率降低,表观活化能增加,煤样在临界温度点前后经过不同的反应历程。
To study the inhibitor characteristics of a new type of rare earth of layered double hydroxides(LDHs) inhibitor on bituminous coal, a temperature programmed experimental device independently developed by Xi'an University of Science and Technology was conducted in this tests, the LDHs with three different proportions were mixed with coal sample and then heated up. Heating from room temperature to 180 ° C with the heat rating of 0.3 ° C/min, we analyze the gas produced by the sample during the oxidation process at the setting temperature. The properties of inhibition were studied, mainly including oxygen consumption rate, inhibition rate, apparent activation energy, etc. The results show that the three kinds of ratios of LDHs have different inhibition properties, and the inhibition ratio changes with temperature, and the inhibition performance is LDHs-3 >LDHs-1>LDHs-2. The maximum inhibition rate of LDHs-3 was 60%, and the apparent activation energy increased by 5.4 k J and4.5 k J in two stages, respectively. LDHs can effectively inhibit the release of CO, increase the critical temperature and dry cracking temperature, reduce the oxygen consumption rate, and increase the apparent activation energy. The coal samples undergo different reaction processes before and after the critical temperature point.
To study the inhibitor characteristics of a new type of rare earth of layered double hydroxides(LDHs) inhibitor on bituminous coal, a temperature programmed experimental device independently developed by Xi'an University of Science and Technology was conducted in this tests, the LDHs with three different proportions were mixed with coal sample and then heated up. Heating from room temperature to 180 ° C with the heat rating of 0.3 ° C/min, we analyze the gas produced by the sample during the oxidation process at the setting temperature. The properties of inhibition were studied, mainly including oxygen consumption rate, inhibition rate, apparent activation energy, etc. The results show that the three kinds of ratios of LDHs have different inhibition properties, and the inhibition ratio changes with temperature, and the inhibition performance is LDHs-3 >LDHs-1>LDHs-2. The maximum inhibition rate of LDHs-3 was 60%, and the apparent activation energy increased by 5.4 k J and4.5 k J in two stages, respectively. LDHs can effectively inhibit the release of CO, increase the critical temperature and dry cracking temperature, reduce the oxygen consumption rate, and increase the apparent activation energy. The coal samples undergo different reaction processes before and after the critical temperature point.
引文
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[2]Zhou F,Ren W,Wang D,et al.Application of threephase foam to fight an extraordinarily serious coal mine fire[J].International Journal of Coal Geology,2006,67(1):95-100.
[3]徐精彩,文虎,邓军,等.凝胶防灭火技术在煤层内因火灾防治中的应用[J].中国煤炭,1997(5):28-30.
[4]马砺,任立峰,艾绍武,等.氯盐阻化剂对煤自燃极限参数影响的试验研究[J].安全与环境学报,2015,15(4):83-88.
[5]施春红,金龙哲,刘结友.新型防火抑尘剂的应用[J].煤炭学报,2007,32(6):608-611.
[6]于水军,谢锋承,路长,等.不同还原程度煤的氧化与阻化特性[J].煤炭学报,2010,35(S1):136-140.
[7]李金亮,陆伟,徐俊.化学阻化剂防治煤自燃及其阻化机理分析[J].煤炭科学技术,2012,40(1):50-53.
[8]王要令,池吉安,陈铎.煤炭自燃阻化剂的试验研究[J].郑州大学学报(工学版),2015,36(1):41-44.
[9]贺飞,王继仁,郝朝瑜,等.脱氧型阻化剂对煤自燃的抑制效果[J].煤炭学报,2016,41(11):2780-2785.
[10]Manzi-Nshuti C,Wang D,Hossenlopp J M,et al.The role of the trivalent metal in an LDH:Synthesis,characterization and fire properties of thermally stable PMMA/LDH systems[J].Polymer Degradation and Stability,2009,94(4):705-711.
[11]徐精彩,许满贵,文虎,等.煤氧复合速率变化规律研究[J].煤炭转化,2000,23(3):63-66.
[12]彭本信.煤的自然发火阻化剂及其阻化机理[J].煤炭学报,1980(3):40-50.
[13]张嬿妮.煤氧化自燃微观特征及其宏观表征研究[D].西安:西安科技大学,2012.