原创《煤粉压力燃烧特性动力学分析》：本论文可用于煤粉论文范文参考下载，煤粉相关论文写作参考研究。
摘 要：利用加压热重分析天平,采用非等温燃烧方法对国内某钢铁厂高炉典型喷吹煤粉的燃烧特性及反应动力学参数进行了实验研究.研究了在0.1,1.1,2.1,3.1,4.1 MPa压力等级下试样煤粉的着火温度、最大燃烧速率温度、燃尽温度、综合燃烧特性指数（S）、最大燃烧速率等燃烧特征参数,计算了煤粉燃烧过程的活化能（E）和指前因子（A）.结果表明,北区煤粉在压力等级由01 MPa升至4.1 MPa的燃烧过程中,着火点温度最多下降了85.7 K,失重峰值温度最多提前了249.3 K,燃尽温度最多下降了375 K,最大燃烧速率最多提升了10倍,燃烧特性指数最大为常压下的33.6倍；两段热解活化能和指前因子的对数值之间存在动力学补偿效应；煤粉的反应控制条件及燃烧方式转变的临界压力为3.1 MPa.
关键词：炼铁；煤粉；压力热重分析；燃烧；动力学参数；临界压力
中图分类号：TF536.1文献标志码：A
ZUO Qiwei,CANG Daqiang,ZHAO Jun,et al.Combustion characteristics and kinetic analysis of pulverized coal under different pressure grades[J].Journal of Hebei University of Science and Technology,2016,37（1）：88-95.Combustion characteristics and kinetic analysis of pulverized
coal under different pressure grades
ZUO Qiwei1,2, CANG Daqiang1,2, ZHAO Jun3,YANG Jingbo1,3, AN Xia3
（1.School of Metallurgical and Ecological Engineering, University of Science &Technology Beijing, Beijing 100083, China；2.State Key Laboratory of Advanced Metallurgy, Beijing 100083, China； 3.Technology Center, Tangshan Iron and Steel Company Limited, Tangshan, Hebei 063016, China）
Abstract：By using thermo gravimetric balance, experimental research on combustion characteristics and dynamics parameters of the typical coal injection from some domestic steelworks are conducted with non-isothermal method. The combustion characteristic parameters of the sample pulverized coal such as ignition temperature, peak temperature at maximum weight loss rate, burnout temperature, general burn exponent（S）, and maximum combustion rate are studied under pressure grades of 0.1, 1.1, 2.1, 3.1 and 4.1 MPa, the activation energy （E） and pre-exponential factor in the combustion process are calculated. The results show that when the pressure increases from 0.1 to 4.1 MPa, ignition temperature decreases by 85.7 K at most, peak temperature at maximum weight loss rate decreases by 249.3 K at most, burnout temperature decreases by 375 K at most, maximum weight loss rate increases by 10 times, and S increases by 33.6 times at most. It is also shown that there exists a kinetic complementation between E and ln A from the view point of dynamics, and the critical pressure of pulverized coal reaction control requirement and combustion mode transform is 3.1 MPa for the pulverized coal.
Keywords：iron making； pulverized coal； pressure thermo gravimetric analysis； combustion； kinetics parameters； critical pressure
煤粉在直吹管内被热风加速到100～200 m/s,在高炉的回旋区内停留的时间只有十几个毫秒.因此,限制煤粉喷吹量提升的重要因素之一是煤粉在风口前的燃烧速率太低[1-3],大量未燃的煤粉随气流进入到高炉渣中,导致煤粉利用率降低,煤焦置换比减小,引起炉况不顺,制约高炉的正常生产[4-5].压力燃烧可以提高煤粉在高炉回旋区的燃烧速率,是改良煤粉燃烧状况的重要途径.
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