升温速率对不粘煤煤氧复合过程放热量的影响研究

doi:10.16265/j.cnki.issn1003-3033.2025.12.1812

摘要/Abstract

摘要：

为明确升温速率对不粘煤煤氧复合过程放热量的影响,采用同步热分析仪测试不粘煤在不同升温速率下(10、20、30、40 ℃/min)升温至1 000 ℃的热释放过程,分析煤氧复合过程放热量及着火热变化;采用Starink法求解表观活化能,明确表观活化能对放热量的影响;采用灰色关联法分析受升温速率影响最大的煤氧复合阶段。结果表明:不粘煤的热流变化可以划分为蒸发吸热、氧化放热、分解蓄热、燃烧放热和燃尽5个阶段。随着升温速率的增大,热流密度逐渐向高温区偏移并出现能量再分配现象,单位质量不粘煤放热量增加19.2%。燃烧放热阶段放热量占比由70.6%升高至75.1%,着火热为360~380 J/g。表观活化能在转化率为0~0.90之间逐渐减小,转化率为0.95时突增,峰值为143.44 kJ/mol。燃烧放热阶段和燃尽阶段受升温速率影响最大,蒸发吸热阶段受升温速率的影响最小。

关键词: 不粘煤, 升温速率, 煤氧复合, 放热量, 表观活化能

Abstract:

Non-caking coal was often used as gasification and power generation coal, and the heat generation was low due to the coal formation stage, and the heating rate had a greater influence on the heat release of coal-oxygen composite at different stages. The heat release process of Non-caking coal at different heating rates (10, 20, 30, 40 ℃/min) up to 1 000 ℃ was tested by synchronous thermal analyzer, and the changes of heat release and ignition heat in the coal-oxygen composite process were analyzed. The apparent activation energy was solved by the Starink method, and the effect of apparent activation energy on the heat release was clarified. The coal-oxygen composite stage with the greatest influence of heating rate was analyzed by the gray correlation method. The gray correlation method was used to analyze the coal-oxygen composite stage that was most affected by the heating rate. The results show that the heat flow changes of Non-caking coal can be divided into five stages: evaporation heat absorption, oxidation exothermic, decomposition heat storage, combustion exothermic and combustion exhaustion. With the increase of heating rate, the heat flow density gradually shifts to the high temperature area and the energy redistribution phenomenon occurs, and the heat release per unit mass of Non-caking coal increases by 19.2%. The percentage of exothermic heat in the exothermic stage of combustion increases from 70.6% to 75.1%, and the heat of ignition is 360~380 J/g. The apparent activation energy decreases gradually from 0 to 0.90, and increased abruptly at 0.95, with a peak value of 143.44 kJ/mol. The exothermic stage of combustion and exhaustion stage were most affected by the warming rate, and the evaporation and heat absorption stage was least affected by the warming rate.

Key words: non-caking coal, rate of warming, coal-oxygen complex, heat release, apparent activation energy

中图分类号:

X936

马砺, 冯锦博, 赵青山, 张德灿, 卢育, 娄芳. 升温速率对不粘煤煤氧复合过程放热量的影响研究[J]. 中国安全科学学报, 2025, 35(12): 26-35.

MA Li, FENG Jinbo, ZHAO Qingshan, ZHANG Decan, LU Yu, LOU Fang. Study on effect of heating rate on heat release of coal-oxygen composite process of non-coking coal[J]. China Safety Science Journal, 2025, 35(12): 26-35.

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煤样	质量分数/%
煤样	水分	灰分	挥发分	固定碳
不粘煤	4.303	8.174	27.408	35.910

升温速率/(℃·min^-1)	10	20	30	40
时间差/min	12.75	7.35	5.69	4.24
实际温度差/℃	133.4	160.2	200.45	199.29
理论温度差/℃	127.5	147.0	170.7	169.6
差值/℃	5.90	13.20	29.75	29.69

升温速率/(℃·min^-1)	10	20	30	40
时间差/min	8.42	4.58	3.48	3.55
实际温度差/℃	82.09	89.50	98.35	143.21
理论温度差/℃	84.20	91.60	104.40	142.00
差值/℃	-2.11	-2.10	-6.05	1.21

升温速率/(℃·min^-1)	10	20	30	40
能量/(J·g^-1)	1 453.2	1 480.1	1 648.8	1 733.4
能量增加比例/%	0	1.8	13.5	19.2

升温速率/ (℃·min)	10	20	30	40
理论着火温度/℃	380.7	402.4	425.6	432.2
着火热/(J·g^-1)	382.3	365.9	359.5	378.6