基于热爆炸理论的煤燃点确定及动力学分析

doi:10.16265/j.cnki.issn1003-3033.2022.02.009

摘要/Abstract

摘要：

为准确判断煤燃点,提高煤自燃灾害防治能力,依据热爆炸理论,结合煤自燃过程放热曲线,将煤自燃升温过程中微分热流曲线上第1处极小值点作为煤的燃点,计算煤着火前后放热过程动力学参数变化。结果表明:随升温速率增加,煤自燃反应放热过程逐渐向高温区域移动,煤燃点逐渐增大,反应的活化能逐渐减小;同一升温速率下燃点之后煤的活化能增大;燃点之前的煤氧反应级数为1.5,燃点后降低为1;燃点后的煤氧燃烧更加充分,煤自燃更加难以控制。

关键词: 热爆炸理论(TET), 煤燃点, 动力学, 煤自燃, 差示扫描量热(DSC)

Abstract:

In order to accurately decide ignition point of coal and improve prevention and control ability of spontaneous combustion disasters, according to TET and with consideration to heat release curve of spontaneous combustion process, the first minimum point on differential heat flow curve in the process was taken as ignition point, and dynamic parameters during heat release before and after ignition were calculated. The results show that along with increase in heating rate, exothermic process of coal spontaneous combustion gradually moves to high temperature regions, and ignition point also increases gradually, while activation energy of reaction decreases in the same manner. At the same heating rate, activation energy of coal increases after ignition, with the level of coal oxygen reaction being decreased to 1 after ignition point from 1.5 before it. It is also found that oxygen combustion of coal after ignition is more sufficient, and spontaneous combustion is more difficult to control.

Key words: thermal explosion theory(TET), ignition point, dynamics, coal spontaneous combustion, differential scanning calorimetry(DSC)

陈晓坤, 王晨熹, 翟小伟. 基于热爆炸理论的煤燃点确定及动力学分析[J]. 中国安全科学学报, 2022, 32(2): 59-65.

CHEN Xiaokun, WANG Chenxi, ZHAI Xiaowei. Determination and kinetics analysis of coal ignition point based on thermal explosion method[J]. China Safety Science Journal, 2022, 32(2): 59-65.

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煤种	工业分析
煤种	水分	灰分	挥发分	固定碳
不粘煤	4.21	7.73	36.31	51.75

升温速率	反应级数	燃点前		燃点后
升温速率	反应级数	拟合函数表达式	R²	拟合函数表达式	R²
5	0.5	y=81 309.55x+4.22	0.911 1	y=77 233.00x-0.98	0.924 8
	1	y=87 216.39x+5.73	0.932 4	y=99 228.46x+3.06	0.968 2
	1.5	y=94 344.36x+7.54	0.943 5	y=132 350.23x+9.11	0.936 4
	2	y=102 558.67x+9.62	0.939 4	y=173 579.29x+16.62	0.865 9
	2.5	y=11 606.71x+11.91	0.922 0	y=219 166.47x+24.91	0.807 5
	3	y=121 276.47x+14.36	0.896 5	y=267 219.99x+33.66	0.766 7
10	0.5	y=79 483.84x+3.33	0.940 1	y=74 366.62x-1.91	0.945 9
	1	y=85 320.08x+4.76	0.957 1	y=96 022.88x+1.95	0.984 0
	1.5	y=92 249.34x+6.46	0.964 5	y=12 7830.21x+7.58	0.956 4
	2	y=100 176.96x+8.42	0.958 9	y=167 316.43x+14.55	0.893 9
	2.5	y=108 904.77x+10.57	0.941 8	y=21 148.69x+22.29	0.840 2
	3	y=118 245.52x+12.88	0.917 5	y=257 489.20x+30.46	0.801 9
15	0.5	y=67 400.88x+0.69	0.895 1	y=73 372.21x-2.41	0.940 3
	1	y=71 593.32x+1.79	0.913 3	y=92 349.00x+0.93	0.980 4
	1.5	y=76 545.00x+3.05	0.923 2	y=121 747.90x+6.01	0.979 9
	2	y=82 215.07x+4.51	0.920 7	y=156 691.15x+12.07	0.949 7
	2.5	y=88 444.86x+6.13	0.906 3	y=195 659.65x+18.81	0.913 5
	3	y=95 098.05x+7.85	0.883 8	y=237 041.23x+25.98	0.88 24