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浙江大学学报(工学版)
J4  2012, Vol. 46 Issue (3): 482-488    DOI: 10.3785/j.issn.1008-973X.2012.03.015
    
Ignition model and kinetic parameters analysis of oxygen-enriched
combustion of pulverized coal
ZHOU Zhi-jun, JIANG Xu-dong, ZHOU Jun-hu, LIU Jian-zhong, CEN Ke-fa
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Abstract  

The oxygen-enriched combustion of pulverized coal was simulated in Thermal Gravimetric Analysis (TGA) instrument, in order to understand the mechanism of oxygen-enriched combustion of coal, especially how to judge the ignition model. The TGA tests were done with oxygen concentrations of 21%, 40%, 60%, 80% and 100%, with two kinds of atmospheres (N2/O2, CO2/O2), and with different particle sizes of pulverized coal. Also the activation energy and pre-exponential factor of coal were calculated by CoatsRedfern. And in line with TG-DTG curves, a new accurate method to judge the ignition model of pulverized coal in oxygen-enriched combustion was presented. The new method is more exact in judge the ignition model of pulverized coal. Results showed that the homogeneous ignition of pulverized coal was happened when the particle size under than 40 μm, and the heterogeneous ignition of pulverized coal was happened when the particle size more than 200 μm in the atmospheres of CO2/O2. The influence of large particles is more than small particles, when the oxygen volume fraction was changed.

Published: 01 March 2012
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Cite this article:

ZHOU Zhi-jun, JIANG Xu-dong, ZHOU Jun-hu, LIU Jian-zhong, CEN Ke-fa. Ignition model and kinetic parameters analysis of oxygen-enriched
combustion of pulverized coal. J4, 2012, 46(3): 482-488.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2012.03.015     OR     http://www.zjujournals.com/eng/Y2012/V46/I3/482


煤粉富氧燃烧着火模式判断和动力学参数分析

为了能够更深入地了解煤粉在富氧气氛下的燃烧机理,尤其是煤粉富氧着火模式的判断,在热重分析仪上,模拟了不同氧气体积分数下的煤粉富氧燃烧过程.选取5个不同的氧气体积分数：21%、40%、60%、80%和100%,并且模拟了2种气氛下（N2/O2,CO2/O2）和不同颗粒大小的煤粉的富氧燃烧过程.并根据普适积分法,计算了煤粉的活化能和指前因子.提出了一种根据TG-DTG曲线判断煤粉着火模式的新方法，它使得煤粉着火模式的判断更为准确.研究发现,在CO2/O2气氛下的富氧燃烧过程中，当煤粉粒径小于40 μm时，煤粉发生非均相着火；当煤粉粒径大于200 μm时，煤粉发生均相着火.大颗粒比小颗粒受氧气体积分数变化的影响要大.

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