火电厂及煤化工行业的制粉系统经常出现煤粉燃烧燃爆事故，严重影响了安全生产，掌握制粉系统内煤粉燃爆的临界参数对于预防煤粉爆炸尤为重要。本文采用理论分析、实验测试和数值模拟结合的方式研究高温环境中煤粉自燃与燃爆临界参数，实验研究不同环境温度条件下煤粉的放热特性、质量损失及燃烧特性，设计高温环境下煤粉不同状态自燃和燃爆的实验系统，研究高温环境中堆积煤粉自燃和高温煤粉颗粒卷扬发生燃爆的临界参数。研究结果为减少制粉系统的燃爆事故提供理论基础。

采用 STA449F3 同步热分析仪测试了不同升温速率和氧浓度下煤粉的放热特性。煤粉氧化燃烧过程中放热量随升温速率和氧浓度的增加不断增加，当氧浓度为 9%、升温速率为 40 ℃/min 时达到最大值。根据 TG 和 DTG 曲线将煤粉氧化燃烧过程划分为五个阶段，并确定特征温度点；随着升温速率和氧浓度的增加，可燃性指数和综合燃烧特性指数增大，煤粉的燃烧性能增强；煤粉的表观活化能范围为 107.3~148.4 kJ/mol。

搭建高温环境煤粉层自燃特征参数测试系统，实验研究不同环境温度和堆积厚度下煤粉层内部的温度变化、最低着火温度（MIT）和着火延迟时间（Ti）。随着环境温度的升高，堆积煤粉的最低着火温度和着火延迟时间逐渐降低，最低着火温度最大值为 215 ℃，着火延迟时间最长为 39.8 min；随着堆积厚度的增加，最低着火温度逐渐降低，着火延迟时间逐渐增加。煤粉在高温环境中发生自燃的风险会随着环境温度和堆积厚度的升高而增加。

利用煤粉自燃粉尘孕爆环境参数和燃爆特性测定装置，测试不同环境温度和煤粉云浓度下高温煤粉颗粒卷扬发生的燃爆过程、火焰传播特性。煤粉卷扬后发生燃爆现象的剧烈程度随环境温度的升高和煤粉云浓度的增加而增强；煤粉云浓度在 140 ~380g/m³内，燃爆临界上限环境温度为 200 ℃，下限环境温度为 120 ℃，在环境温度处于100~200 ℃范围内，临界煤粉云浓度上限为 430 g/m³，下限为 95 g/m³；随着环境温度的升高，火焰温度达到峰值的时间缩短，且温度峰值增加，传播速度峰值也随之增加。

通过 Fluent 建立煤粉燃爆的数学模型，研究煤粉云燃爆过程中颗粒的分布，探究不同氧气浓度下煤粉云燃爆的温度和速度变化规律。实验结果与模拟结果的相对误差小于 10%，验证了模型的可靠性；高温煤粉颗粒在气流卷携下进入燃烧室后会经历三个阶段，快速喷射阶段、减速扩散阶段及自由扩散阶段；随着氧气浓度的降低，煤粉云燃爆的火焰温度和火焰传播速度减小。

Pulverized coal combustion and explosion accidents often occur in the pulverizing system of thermal power plants and coal chemical industry, which seriously affects the safety of production, and it is particularly important to grasp the critical parameters of pulverized coal explosion in the pulverizing system to prevent pulverized coal explosion. In this paper,

the critical parameters of spontaneous combustion and explosion of pulverized coal in high temperature environment are studied by combining theoretical analysis, experimental test and numerical simulation, the exothermic characteristics, mass loss and combustion characteristics

of pulverized coal under different ambient temperature conditions are experimentally studied, the experimental system of spontaneous combustion and explosion of pulverized coal indifferent states of high temperature environment is designed, and the critical parameters of

spontaneous combustion of pulverized coal accumulation and ignition and explosion of pulverized coal particles in high temperature environment are studied. The results of this study provide a theoretical basis for reducing the explosion accidents of the milling system.

The exothermic characteristics of pulverized coal under different heating rates and oxygen concentrations were tested by STA449F3 synchronous thermal analyzer. The heat release increases with the increase of heating rate and oxygen concentration during the oxidation combustion of pulverized coal, and reaches the maximum value when the oxygen

concentration is 9% and the heating rate is 40 °C/min. According to the TG and DTG curves, the oxidative combustion process of pulverized coal was divided into five stages, and the characteristic temperature points were determined, and with the increase of heating rate and oxygen concentration, the flammability index and comprehensive combustion characteristic index increased, and the combustion performance of pulverized coal was enhanced, and the apparent activation energy range of pulverized coal was 107.3~148.4 kJ/mol.

A test system for spontaneous combustion characteristic parameters of pulverized coal seam in high-temperature environment was built to study the temperature change, minimum ignition temperature (MIT) and ignition delay time (Ti) of pulverized coal seam under different ambient temperatures and accumulation thicknesses. With the increase of ambient

temperature, the minimum ignition temperature and ignition delay time of the stacked pulverized coal gradually decreased, the maximum minimum ignition temperature was 215 °C, and the maximum ignition delay time was 39.8 min. The risk of spontaneous combustion of pulverized coal in a high-temperature environment increases with the ambient temperature and thickness of the accumulation.

The explosion process and flame propagation characteristics of high-temperature pulverized coal particle winch under different ambient temperatures and pulverized coal cloud concentrations were tested by using the environmental parameters and explosion characteristics measurement device of pulverized coal spontaneous combustion dust

precipitation. The intensity of the explosion phenomenon after the hoisting increases with the increase of ambient temperature and the concentration of pulverized coal clouds, the concentration of pulverized coal clouds is within 140 ~380 g/m³, the critical upper limit of ambient temperature is 200 °C, the lower limit of ambient temperature is 120 °C, and the upper limit of critical pulverized coal cloud concentration is 430 g/m³ and the lower limit is

95 g/ m³; As the ambient temperature increases, the time for the flame temperature to reach its peak decreases, and as the temperature peak increases, so does the peak propagation velocity.

Through Fluent, a mathematical model of pulverized coal explosion was established to study the distribution of particles during the explosion of pulverized coal clouds, and the temperature and velocity changes of pulverized coal cloud explosions under different oxygen concentrations were explored. The relative error between the experimental results and the

simulation results is less than 10%, which verifies the reliability of the model, and the flame temperature and flame propagation velocity of the pulverized coal cloud explosion decrease with the decrease of oxygen concentration

[1] 徐精彩. 煤自燃危险区域判定理论[M]. 北京:煤炭工业出版社, 2001.

[2] 刘明亮, 卫浩, 盖玉龙, 等. 中国、美国、欧盟及世界一次能源消费现状与展望[J]. 煤化工, 2022, 50(02): 1-5.

[3] 克诚. 煤化工工艺与设备的关键技术[J]. 化工设计通讯, 2022, 48(05): 4-6.

[4] Wu D, Norman F, Verplaetsen F, et al. Experimental study on the minimum ignition temperature of coal dust clouds in oxy-fuel combustion atmospheres[J]. Procedia Engineering, 2014, 84:330-339.

[5] Ajrash M J, Zanganeh J, Moghtaderi B. Experimental investigation of the minimum auto-ignition temperature (MAIT) of the coal dust layer in a hot and humid environment[J]. Fire Safety Journal, 2016, 82:12-22.

[6] 张建良, 王广伟, 邢相栋, 等. 煤粉富氧燃烧特性及动力学分析[J]. 钢铁研究学报,2013, 25(04):9-14.

[7] Wu Zhengyan, Hu Shanshan, Jiang Shuguang, et al. Experimental study on prevention and control of coal spontaneous combustion with heat control inhibitor[J]. Journal of Loss Prevention in the Process Industries, 2018, 56: 272-277.

[8] 肖旸, 郭涛, 赵婧昱, 等. 气煤恒温氧化动力学特性研究[J]. 煤矿安全, 2019, 50(09): 51- 56+60.

[9] 邓军, 张敏, 雷昌奎, 等. 不同变质程度煤自燃特性及低温氧化动力学分析[J]. 安全与环境学报, 2021, 21(01): 94-100.

[10] Naktiyok J., Bayrakçeken H., Özer A. K., et al. Investigation of combustion kinetics of Umutbaca-lignite by thermal analysis technique[J]. Journal of Thermal Analysis and

Calorimetry, 2017, 129(1): 531-539.

[11] 候飞, 曹威虎, 王艺, 等. 煤低温氧化动力学参数测试方法对比研究[J]. 工矿自动化, 2021, 47(09): 58-64+69.

[12] Stott J. B., Harris B. J., Hansen P. J. A ‘full-scale’laboratory test for the spontaneous heating of coal[J]. Fuel, 1987, 66(7): 1012-1013.

[13] Li B., Chen G., Zhang H., et al. Development of non-isothermal TGA–DSC for kinetics analysis of low temperature coal oxidation prior to ignition[J]. Fuel, 2014, 118: 385-391.

[14] Qi G., Wang D., Zheng K., et al. Kinetics characteristics of coal low-temperature oxidation in oxygen-depleted air[J]. Journal of Loss Prevention in the Process Industries, 2015, 35: 224-231.

[15] 徐永亮, 王兰云, 宋志鹏, 余明高, 荆国松. 基于交叉点法的煤自燃低温氧化阶段特性和关键参数[J]. 煤炭学报, 2017, 42(4):935–941.

[16] 李青蔚. 煤贫氧氧化热动力过程基础研究[D]. 西安: 西安科技大学, 2018.

[17] 赵彤宇, 王刚, 于贵生, 等. 煤自燃危险性测试技术条件热力学参数的实验分析[J].煤矿安全，2010,7:16-22.

[18] 白志豪,陈浩,韦波,等.吐哈盆地褐煤的热解和燃烧特性及动力学分析[J].煤炭转

化,2023,46(05):21-30.

[19] 余明高, 袁壮, 褚廷湘, 郭品坤, 郑凯. 煤自燃预测气体及活化能变化研究[J]. 安全与环境学报, 2017,17(05):1788-1795.

[20] 邓军, 徐精彩, 张迎弟, 等. 煤最短自然发火期实验及数值分析[J]. 煤炭学报, 1999, 24(3): 274–278.

[21] 邓军, 张扬, 李成会, 等. 水浸煤体自燃极限参数和氧化动力学的研究[J]. 煤炭技术, 2016,35(3): 152–154.

[22] 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.

[23] Wu D，Martin S，Jan B. Spontaneous ignition behaviour of coal dust accumulations: A comparison of extrapolation methods from lab-scale to industrial-scale [J]. Proceedings of the Combustion Institute, 2018, 1-11.

[24] Li B, Li M, Gao W, et al. Effects of particle size on the self-ignition behaviour of a coal dust layer on a hot plate[J]. Fuel, 2020, 260.

[25] Dmitrii O. Glushkov, Geniy V. Kuznetsov, Pavel A. Strizhak. Experimental and numerical study of coal dust ignition by a hot particle[J]. Applied Thermal Engineering, 2018, 133.

[26] Glushkov D O，Kuznetsov G V , Strizhak P A . Experimental and numerical study of coal dust ignition by a hot particle[J]. Applied Thermal Engineering, 2018, 133:774-784.

[27] 李润之. 不同挥发分煤尘层最低着火温度变化规律研究[J]. 安全与环境学报, 2017, 17(03): 954-957.

[28] Li B., Li M., Gao W., et al. Effects of particle size on the self-ignition behaviour of a coal dust layer on a hot plate[J]. Fuel, 2020, 260.

[29] Xiang Gou., Jin Xiangwu., Lian Shengliu. et al. Study on Factors Influencing Pulverized Coal Ignition Time [C].//Advances in Power and Electrical Engineering. Part 1:Trans Tech Publications, 2013:118-123.

[30] 刘天奇, 王宁, 李渊博. 不同煤质煤尘层最低着火温度特性及其影响因素研究[J]. 安全 与环境学报, 2019, 19(03): 831-836.

[31] 马砺, 李超华, 武瑞龙, 等. 最低点火温度条件下煤粉自燃特性试验研究[J]. 煤炭科学技术, 2020, 48(02): 110-117.

[32] Li B., Liu G., Bi M.-S., et al. Self-ignition risk classification for coal dust layers of three coal types on a hot surface[J]. Energy, 2021, 216.

[33] Wu D., Huang X., Norman F., et al. Experimental investigation on the self-ignition behaviour of coal dust accumulations in oxy-fuel combustion system[J]. Fuel, 2015, 160:

245-254.

[34] Yuan H., Restuccia F., Rein G. Computational study on self-heating ignition and smouldering spread of coal layers in flat and wedge hot plate configurations[J]. Combustion and Flame, 2020, 214: 346-357.

[35] Wu D., Song Z., Schmidt M., et al. Theoretical and numerical study on ignition behaviour of coal dust layers on a hot surface with corrected kinetic parameters[J]. J Hazard Mater, 2019, 368: 156-162.

[36] Ren L.-F., Li Q.-W., Xiao Y., et al. Critical parameters and risk evaluation index for spontaneous combustion of coal powder in high-temperature environment[J]. Case Stud Therm Eng, 2022, 38: 102-331.

[37] 侯志勇, 李弯弯, 王振平, 等.不同堆积厚度下煤粉自燃预测研究[J].西安科技大学学报,2020,40(06):967-973.

[38] 曹卫国. 褐煤粉尘爆炸特性实验及机理研究[D]. 南京:南京理工大学, 2016.

[39] 汪建平, 刘庆明, 王斌, 等. 基于 Logistic 统计方法的煤粉爆炸下限研究[J]. 煤炭学报,2015, (1): 7.

[40] 陈金健,胡双启,胡立双,等.煤尘云着火温度影响因素实验研究[J].消防科学与技

术,2015,34(04):436-438.

[41] 李珍宝,赵唯辰,李超,等.长焰煤粉爆炸特性及微观机理研究[J/OL].煤炭科学技术,1-9[2024-06-01].

[42] 聂百胜,张豪,宫婕,等.煤粉爆炸宏细观四阶段反应机理[J].中国矿业大学学

报,2023,52(06):1129-1145.

[43] 刘静平,焦枫媛,刘毅飞,等.点火延时对褐煤煤粉爆炸火焰传播过程的影响[J].中北大学学报(自然科学版),2022,43(06):536-540.

[44] 冯黎莉 . 基 于 哈 特 曼 管 的 粉 尘 爆 炸 仿 真 模 拟 研 究 [J]. 能 源 技 术 与 管理,2021,46(05):171-173.

[45] 刘天奇, 郑秋雨, 苏长青. 水平管内不同煤质煤尘爆炸火焰传播特性实验研究[J].中国安全生产科学技术,2018,14(10):127-132.

[46] Liu T., Tian W., Sun R., et al. Experimental and numerical study on coal dust ignition temperature characteristics and explosion propagation characteristics in confined

space[J]. Combustion Science and Technology, 2021: 1-15.

[47] Liu T., Cai Z., Sun R., et al. Flame Propagation Characteristics of Deposited Coal Dust Explosion Driven by Airflow Carrying Coal Dust[J]. Journal of Chemical Engineering of

Japan, 2021, 54(12): 631-637.

[48] Guhathakurta S., Houim R. W. Influence of thermal radiation on layered dust explosions[J]. Journal of Loss Prevention in the Process Industries.2021,104509.

[49] 郭家鑫, 谭迎新, 刘毅飞, 等. 燃烧管长度对煤粉火焰传播规律的影响[J]. 测试技术学报, 2021, 35(05): 381-385.

[50] Wang J., Meng X., Ma X., et al. Experimental study on whether and how particle size affects the flame propagation and explosibility of oil shale dust[J]. Process Safety

Progress, 2019, 38(3): 12075.

[51] Christophe P., Rim B. M., Mohamed G., et al. Thermal radiation in dust flame propagation[J].Journal of Loss Prevention in the Process Industries, 2017, 49: 896-904.

[52] Zhang X., Yu J., Yan X., et al. Flame propagation behaviors of nano-and micro-scale PMMA dust explosions[J]. Journal of Loss Prevention in the Process Industries, 2016, 40: 101-111.

[53] Mehdi Bidabadi，Mohammad Mohebbi，Alireza Khoeini Poorfar， et al. Modeling quenching distance and flame propagation speed through an iron dust cloud with spatially random distribution of particles [J]. Journal of Loss Prevention in the Process

Industries， 2016，43(9)：138-146.

[54] 刘义, 孙金华, 陈东梁. 管道内甲烷煤尘复合火焰结构的实验[J]. 中国科学技术大学学报，2006，36(1)：65-68.

[55] Zhao Y., Zhang W., Feng D., et al. Experimental study of the flame propagation characteristics of pulverized coal in an O2/CO2 atmosphere[J]. Fuel, 2020, 262: 116678.

[56] Gu M., Chen X., Wu C., et al. Effects of particle size distribution and oxygen concentration on the propagation behavior of pulverized coal flames in O2/CO2 atmospheres[J]. Energy & Fuels, 2017, 31(5): 5571-5580.

[57] 郭秀霞,昝文涛,邵建立.煤尘爆炸影响因素的数值模拟（英文）[J].山西大学学报(自然科学版),2022,45(02):400-409.

[58] 禹红英,郭军军,李鹏飞,等.基于 CPD 模型的煤粉颗粒着火特性的数值模拟[J].工程热物理学报,2019,40(06):1439-1445.

[59] Vascellari M, Xu H,Hasse C. Flamelet modeling of coal particle ignition[J]. Proceedings of the Combustion Institute 34 (2013) 2445–2452.

[60] Weiguo Cao, Wei Gao, Yuhuai Peng., et al. Experimental and numerical study on flame propagation behaviors in coal dust explosions[J]. Powder Technology 266 (2014) 456–462.

[61] 刘天奇.水平管道空间煤尘爆炸火焰传播特性数值模拟[J].工矿自动化, 2019, 45(07):59-65.

[62] 李海涛,陈晓坤,邓军,等.开放管道内煤粉云形成机制及爆炸过程火焰动态行为数值

模拟[J].煤炭学报,2021,46(08):2600-2613.

[63] 中华人民共和国国家质量监督检验检疫总局. 煤炭燃烧特性试验方法 热重分析

法:GB/T 33304-2016[S]. 2016.

[64] WIKTOFSSOFL L P，WANZL W. Kinetic parameter for coal pyrolysis at low and high heating rates：a comparison of data from different laboratory equipment[J].Fuel, 2000, 79(06):701－716.

[65] ZHENG S, HU Y, WANG Z, et al. Experimental investigation on ignition and burnout characteristics of semicoke and bituminous coal blends[J].Journal of the Energy Institute,2020,93(04)：1373－1381.

[66] 刘敬勇,傅杰文,孙水裕,等. 不同来源污泥混燃特性及其综合燃烧性能评价[J]. 环境科学学报,2016,36(3):940-952.

[67] 李德波, 王明传, 杨新生, 等. Coats-Redfern 模型和 DAEM 在污泥与煤掺烧过程中的动力学适应性分析 [J]. 广东电力. 2019; 32:70-77.

[68] 胡荣祖. 热分析动力学[M]. 北京: 科学出版社, 2001.

[69] 葛新玉. 基于热分析级数的煤氧化动力学实验研究[D]. 合肥: 安徽理工大学, 2009.

[70] Scaccia S. TG-FTIR and kinetics of devolatilization of Sulcis coal[J]. Journal of Analytical and Applied Pyrolysis, 2013, 104: 95–102.

[71] Deng, J, Li, B, Xiao, Y, et al. Combustion properties of coal gangue using thermogravimetry–Fourier transform infrared spectroscopy[J]. Applied Thermal Engineering, 2017, 116:244-252.1.

[72] 管诗骈, 陈有福, 张恩先, 等. 高斯多峰拟合法在烟煤与褐煤热解动力学模型的应用[J]. 燃烧科学与技术. 2019; 25:556-562.

[73] GB/T 16430-2018,粉尘层最低着火温度测定方法[S].2018.

[74] Reddy P D, Amyotte P R, Pegg M J. Effect of inerts on layer ignition temperatures of coal dust[J]. Combustion and Flame, 1998, 114(01):41-53.

[75] 煤炭工业部煤矿安全标准化技术委员会.粉尘云最小着火能量测定方法：GB/T

16428-1996 [S].北京:中国标准出版社,1997.

[76] 赵懿明,刘毅飞,杨振欣,等. 点火能量对煤尘爆炸火焰传播规律的影响[J]. 中北大学学报（自然科学版）,2022,43(1):70-75.

[77] 裴蓓,张子阳,潘荣锟,等. 不同强度冲击波诱导沉积煤尘爆炸火焰传播特性[J]. 煤炭学报,2021,46(2):498-506.

[78] 谢长春.管道内甲烷爆炸火焰传播特性的实验与数值模拟研究[D].西安:西安科技大学,2015.

[79] 程方明,葛天姣,李国瑞,等.导管长度和通径对粉尘爆炸泄放火焰的影响[J].科学技术与工程,2022,22(20):8646-8651.

[80] Liu Tianqi, Jia Ruiheng, Sun Ruicheng, et al. Research on Ignition Energy Characteristics and Explosion Propagation Law of Coal Dust Cloud under Different Conditions[J]. Math Probl Eng, 2021, 2021: 1- 8.