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Comparison of flame propagation properties of petroleum coke and coals of different rank

机译：不同等级石油焦和煤的火焰传播特性比较

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摘要

Ignition and flame propagation characteristics of 18 kinds of coal and a petroleum coke were investigated through a laser ignition experiment. Flame stability was strongly influenced by amount of volatile matter and pyrolysis rate. Lean limit of flame propagation was strongly influenced by amount of volatile matter. Flame propagation was observed when pyrolized volatile matter was mixed with surrounding air or oxygen, until the concentration of pyrolized volatile matter reached a constant value. Flame propagation velocity was strongly influenced by pyrolysis rate. As the pyrolysis rate increased, the flame propagation velocity increased. The flame propagation velocity of petroleum coke was higher than that of coal with the same volatile content. The flame propagation of petroleum coke was superior to what was expected based on the volatile content, primarily because the high pyrolysis rate caused a shorter ignition delay than what would be expected given the volatile content. A database for the lean limit of flame propagation was used to develop a flame stability model to estimate lean flammability of a large-scale burner. The model could predict the effect of the coal rank, the particle diameter distribution for lean flammability limit. The estimated lean flammability limit of petroleum coke (volatile content 11.5%) was equal to that of lv bituminous coal with volatile content of about 15%.
机译：通过激光点火实验研究了18种煤和石油焦的点火和火焰传播特性。火焰稳定性受挥发物含量和热解速率的强烈影响。火焰传播的稀薄极限受挥发物含量的强烈影响。当热解挥发物与周围的空气或氧气混合时，观察到火焰蔓延，直到热解挥发物的浓度达到恒定值为止。火焰的传播速度受热解速率的强烈影响。随着热解速率的增加，火焰的传播速度增加。挥发分相同的情况下，石油焦的火焰传播速度要比煤高。石油焦的火焰传播优于基于挥发物含量的预期，主要是因为高的热解速率引起的点火延迟比考虑到挥发物含量的预期更短。使用火焰传播稀薄极限的数据库来开发火焰稳定性模型，以估算大型燃烧器的稀薄可燃性。该模型可以预测煤等级，稀薄燃烧极限的粒径分布的影响。估计石油焦（挥发性含量为11.5％）的稀薄可燃极限等于挥发性含量约为15％的lv烟煤的稀燃性极限。

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  • 来源
    《Fuel》 |2009年第8期|1478-1484|共7页
  • 作者

    Masayuki Taniguchi; Hironobu Kobayashi; Kenji Kiyama; Yoshio Shimogori;

  • 作者单位

    Power and Industrial Systems R&D Laboratory, Hitachi Ltd. Power and Industrial Systems, 7-2-1 Omika-cho. Hitachi-shi, Ibaraki-ken 319-1292, Japan Combustion System Group, The Coal Science Project, Power and Industrial Systems R&D Laboratory, Hitachi, Ltd. Power and Industrial Systems, 832-2 Horiguchi, Hitachinaka-shi, Ibaraki-ken 312-0034, Japan;

    Power and Industrial Systems R&D Laboratory, Hitachi Ltd. Power and Industrial Systems, 7-2-1 Omika-cho. Hitachi-shi, Ibaraki-ken 319-1292, Japan;

    Kure Division, Babcock-Hitachi, K. K., 6-9 Takara-cho, Kure-shi, Hiroshima-ken 737-8508, japan;

    Kure Division, Babcock-Hitachi, K. K., 6-9 Takara-cho, Kure-shi, Hiroshima-ken 737-8508, japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    coal combustion; ignition; flame propagation; petroleum coke; flame stability;

    机译：燃煤点火;火焰传播石油焦火焰稳定性;

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