Numerical and experimental studies on the ignition of pulverized coal in O2/H2O atmospheres
Numerical and experimental studies on the ignition of pulverized coal in O2/H2O atmospheres
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O2/H2O气氛中煤粉着火的数值与实验研究
DOI：
10.1016/j.fuel.2014.08.038
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发表时间：
2015
期刊：
影响因子：
7.4
通讯作者：
Chuguang Zheng
中科院分区：
文献类型：
--
作者：
Yang Liu;Kai Zhou;Qingsong Han,;Chuguang Zheng
富氧燃烧被认为是一种很有前途的燃煤发电CO2减排技术。富氧蒸汽燃烧技术因其具有O2/CO2循环燃烧技术无法比拟的诸多优点而被认为是下一代富氧燃烧技术。采用数值模拟和实验相结合的方法，研究了不同氧浓度（21%、30%、35%、40%和50%）的O2/N2和O2/H2O气氛下煤颗粒的着火特性。实验是在一个落管式炉（DTF）使用高速摄像机。实验结果表明，煤粉在O2/H2O和O2/N2气氛中均能均匀着火，且在相同O2摩尔分数下，O2/H2O气氛中的煤粉着火比O2/N2气氛中的煤粉着火快。通过对煤粉着火位置的预测与实验结果的比较，验证了模型的正确性。采用数值模拟的方法详细分析了水的物理化学性质对煤着火的影响。数值模拟结果表明，与相应的O2/N2气氛相比，O2/H2O气氛下煤的水蒸气转化反应是煤提前着火的主要原因，而水蒸气气化反应产生的CO和H2对着火有利，是煤提前着火的次要原因。
Oxy-fuel combustion is regarded as a promising technology for CO2abatement in coal-fired power generation. Oxy-steam combustion technology is regarded as the next generation of oxy-fuel combustion technology because it has numerous advantages over O2/CO2recycled combustion. The ignition of coal particles was investigated using numerical and experimental analysis in O2/N2and O2/H2O atmospheres with different oxygen concentrations (21%, 30%, 35%, 40% and 50%). The experiments were performed in a drop tube furnace (DTF) using a high-speed camera. The experimental results show that the pulverized coal ignites homogeneously in both the O2/H2O and O2/N2atmospheres, and the ignition of pulverized coal occurs sooner in the O2/H2O atmospheres than in the O2/N2atmosphere with an identical O2mole fraction. The model proposed in the paper was validated by comparison of the predicted locations of the coal ignition with the experimental results. The effects of the physicochemical properties of H2O on the ignition of coal were analyzed in detail by numerical simulation. The results of numerical simulation showed that the steam shift reaction is the primary reason for the advanced ignition of coal in the O2/H2O atmospheres compared with the corresponding O2/N2atmospheres, and the steam gasification reaction is a minor reason for the phenomena because it produces CO and H2, which are beneficial in the ignition.
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影响因子：
4.4
作者：
Nozomu Hashimoto;R. Kurose;Seung-min Hwang;Hirofumi Tsuji;H. Shirai
通讯作者：
Nozomu Hashimoto;R. Kurose;Seung-min Hwang;Hirofumi Tsuji;H. Shirai
影响因子：
7.4
作者：
R. Jovanović;A. Milewska;B. Świątkowski;A. Goanță;H. Spliethoff
通讯作者：
R. Jovanović;A. Milewska;B. Świątkowski;A. Goanță;H. Spliethoff
影响因子：
7.5
作者：
Alvarez, L.;Gharebaghi, M.;Rubiera, F.
通讯作者：
Rubiera, F.
影响因子：
4.4
作者：
Maffei, Tiziano;Khatami, Reza;Levendis, Yiannis A.
通讯作者：
Levendis, Yiannis A.
DOI：
10.1021/i160062a001
发表时间：
1977-01-01
期刊：
INDUSTRIAL & ENGINEERING CHEMISTRY FUNDAMENTALS
影响因子：
--
作者：
CARAM, HS;AMUNDSON, NR
通讯作者：
AMUNDSON, NR