月桂酸与硬脂酸粉尘爆炸过程热解动力学与火焰传播特性关系

张延松 李南 郭瑞 张新燕 张公妍 黄兴旺

张延松, 李南, 郭瑞, 张新燕, 张公妍, 黄兴旺. 月桂酸与硬脂酸粉尘爆炸过程热解动力学与火焰传播特性关系[J]. 爆炸与冲击, 2022, 42(7): 075402. doi: 10.11883/bzycj-2021-0470
引用本文: 张延松, 李南, 郭瑞, 张新燕, 张公妍, 黄兴旺. 月桂酸与硬脂酸粉尘爆炸过程热解动力学与火焰传播特性关系[J]. 爆炸与冲击, 2022, 42(7): 075402. doi: 10.11883/bzycj-2021-0470
ZHANG Yansong, LI Nan, GUO Rui, ZHANG Xinyan, ZHANG Gongyan, HUANG Xingwang. Relationship between pyrolysis kinetics and flame propagation characteristics of lauric acid and stearic acid dust explosion[J]. Explosion And Shock Waves, 2022, 42(7): 075402. doi: 10.11883/bzycj-2021-0470
Citation: ZHANG Yansong, LI Nan, GUO Rui, ZHANG Xinyan, ZHANG Gongyan, HUANG Xingwang. Relationship between pyrolysis kinetics and flame propagation characteristics of lauric acid and stearic acid dust explosion[J]. Explosion And Shock Waves, 2022, 42(7): 075402. doi: 10.11883/bzycj-2021-0470

月桂酸与硬脂酸粉尘爆炸过程热解动力学与火焰传播特性关系

doi: 10.11883/bzycj-2021-0470
基金项目: 国家自然科学基金(51904170);山东省自然科学基金(ZR2018BEE006)
详细信息
    作者简介:

    张延松(1964- ),男,博士,教授,zys6407@126.com

    通讯作者:

    张新燕(1987- ),女,博士,副教授,xyzhang_safety@sdust.ecu.cn

  • 中图分类号: O383; X932

Relationship between pyrolysis kinetics and flame propagation characteristics of lauric acid and stearic acid dust explosion

  • 摘要: 综合应用同步热分析仪、改进的哈特曼爆炸测试装置及高速摄影系统,对月桂酸与硬脂酸粉尘的热解氧化特性及其在半封闭竖直管道内的火焰传播特性开展了实验研究,并分析讨论了月桂酸与硬脂酸粉尘爆炸燃烧过程中热解动力学与火焰传播特性的关系。结果表明,当粉尘云质量浓度为125 g/m3时,月桂酸粉尘云的火焰锋面结构比硬脂酸平滑,但硬脂酸粉尘的火焰传播速度明显大于月桂酸;随着质量浓度的增加,月桂酸和硬脂酸粉尘的火焰前锋逐渐变得离散,火焰传播速度逐渐增加,但速度差值逐渐减小;月桂酸粉尘的平均火焰传播速度在750 g/m3的粉尘云质量浓度下高于硬脂酸,火焰结构连续性显着降低。低质量浓度条件下月桂酸与硬脂酸粉尘云火焰传播特性差异主要由快速热解阶段的氧化放热特性决定,指前因子越大,参与热解和氧化反应的活性中心越多,氧化放热量越大,放热速率越快,火焰传播速度越快,火焰锋面结构由光滑连续向不规则离散的转变越快。随着粉尘云质量浓度的增加,火焰传播特性差异逐渐由活化能及火焰前锋预热区内氧气的质量输运过程控制,活化能越大,耗氧量越大,耗氧速率越快,越易导致火焰传播速度下降,火焰锋面趋于复杂,火焰结构连续性降低。
  • 图  1  月桂酸和硬脂酸的粉尘粒度分布

    Figure  1.  Particle size distribution of lauric acid and stearic acid dust

    图  2  月桂酸与硬脂酸粉尘的扫描电子显微镜图像

    Figure  2.  Scanning electron microscope images of lauric acid and stearic acid dusts

    图  3  同步热分析仪装置示意图

    Figure  3.  Schematic diagram of synchronous thermal analyzer device

    图  4  改进的哈特曼管实验装置

    Figure  4.  Schematic of the improved Hartmann tube experimental device

    图  5  不同升温速率下月桂酸粉尘和硬脂酸粉尘的热特性曲线

    Figure  5.  Thermal curves of lauric acid and stearic acid dust at different heating rates

    图  6  粉尘云质量浓度125 g/m3条件下月桂酸和硬脂酸粉尘的火焰传播过程

    Figure  6.  Flame propagation processes of lauric acid and stearic acid dusts at the dust cloud concentration of 125 g/m3

    图  7  粉尘云质量浓度375 g/m3条件下月桂酸和硬脂酸粉尘的火焰传播过程

    Figure  7.  Flame propagation processes of lauric acid and stearic acid dusts at the dust cloud concentration of 375 g/m3

    图  8  粉尘云质量浓度500 g/m3条件下月桂酸和硬脂酸粉尘的火焰传播过程

    Figure  8.  Flame propagation processes of lauric acid and stearic acid dusts at the dust cloud concentration of 500 g/m3

    图  9  粉尘云质量浓度750 g/m3条件下月桂酸和硬脂酸粉尘的火焰传播过程

    Figure  9.  Flame propagation processes of lauric acid and stearic acid dusts at the dust cloud concentration of 750 g/m3

    图  10  不同质量浓度条件下月桂酸与硬脂酸粉尘云火焰传播速度

    Figure  10.  Comparison of flame propagation speeds between lauric acid and stearic acid dusts at different dust cloud concentrations

    表  1  月桂酸和硬脂酸的粉尘粒度分布特征参数

    Table  1.   Particle size distribution characteristic parameters of lauric acid and stearic acid dusts

    材料比表面积S/(m2·g−1)表面积平均径D[3,2]/µm体积平均径D[4,3]/µm中位粒径D50/µm
    月桂酸0.4214.2937.5533.97
    硬脂酸0.4612.9735.8630.71
    下载: 导出CSV

    表  2  运用Coats-Redfern法求解的月桂酸和硬脂酸动力学参数[8]

    Table  2.   Kinetic parameters of lauric acid and stearic acid dusts by the Coats-Redfern method[8]

    样品升温速率/(℃·min−1)快速热解阶段慢速热解阶段
    活化能/(kJ·mol−1)指前因子/min机理函数活化能/(kJ·mol−1)指前因子/min机理函数
    月桂酸524.4426726D114.6513.64F1.5
    1026.3444451D121.5314.14F1.5
    1527.4092412D119.73116.39F1.5
    平均值26.065453018.6448.06
    硬脂酸526.8629497F1.529.03433.84D3
    1028.5789067F1.531.531383.00D3
    1530.50126670F1.528.15777.12D3
    平均值 28.6481745 29.57864.65
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-11-10
  • 修回日期:  2021-12-23
  • 网络出版日期:  2022-06-09
  • 刊出日期:  2022-07-25

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