CIESC Journal ›› 2022, Vol. 73 ›› Issue (9): 4133-4146.DOI: 10.11949/0438-1157.20220619

• Energy and environmental engineering • Previous Articles     Next Articles

Chemical kinetic study on coal volatiles combustion for various oxygen concentrations

Chen CHEN1(), Qian YANG1(), Yun CHEN2, Rui ZHANG1(), Dong LIU1()   

  1. 1.School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
    2.Zhejiang Zheneng Electric Power Limited Company, Hangzhou 310000, Zhejiang, China
  • Received:2022-05-05 Revised:2022-07-04 Online:2022-10-09 Published:2022-09-05
  • Contact: Rui ZHANG, Dong LIU

不同氧浓度下煤挥发分燃烧的化学动力学研究

陈晨1(), 杨倩1(), 陈云2, 张睿1(), 刘冬1()   

  1. 1.南京理工大学能源与动力工程学院,江苏 南京 210094
    2.浙江浙能电力股份有限公司,浙江 杭州 310000
  • 通讯作者: 张睿,刘冬
  • 作者简介:陈晨(1998—),女,博士研究生,chenchen_njust@126.com
    杨倩(1996—),女,硕士研究生,1751633651@qq.com
  • 基金资助:
    国家自然科学基金项目(52076110);中央高校基本科研业务费专项资金项目(30920031103)

Abstract:

Coal-burning organic pollutants have serious harm to human health and ecological environment, and O2 has a significant regulatory effect on the formation of organic products in flames. In view of the fact that coal volatiles combustion is a crucial part of coal combustion, the effect of O2 concentration on hydrocarbon formation characteristics and mechanisms in counterflow diffusion flame was studied by numerical simulation using coal pyrolysis gas as fuel. The results showed that the increase of O2 concentration promoted the formation of O and OH, which in turn increased H concentration, highlighting the importance of reactions involving H and OH. In addition, concentrations of acetylene (C2H2), propyne (PC3H4), propargyl (C3H3), vinylacetylene (C4H4), benzene (C6H6) and naphthalene (C10H8) all increased. Increasing O2 concentration promoted the conversion from C2H2 to PC3H4, and made C3H3 more inclined to convert to butadiene (C4H6), while fulvene was more inclined to generate C6H6 through phenyl (C6H5). Therefore, the status of C6H5 as a precursor of C6H6 was strengthened.

Key words: pyrolysis, oxygen concentration, counterflow diffusion flames, organic hydrocarbon pollutants, reaction kinetics, chemical analysis

摘要:

燃煤有机污染物对人类健康和生态环境存在严重危害,而O2对火焰中有机产物的形成具有明显的调控作用。鉴于煤挥发分燃烧是燃煤过程中至关重要的一环,本文以煤热解气为燃料,通过数值模拟研究了氧化剂侧O2浓度对对冲扩散火焰中碳氢产物生成特性和机制的影响。结果表明,O2浓度升高促进了O和OH的生成,进而提高H浓度,突显了含H和OH参与的反应的重要性。此外,乙炔(C2H2)、丙炔(PC3H4)、炔丙基(C3H3)、乙烯基乙炔(C4H4)、苯(C6H6)和萘(C10H8)的浓度均增大。增加O2浓度促进了C2H2向PC3H4的转化,并使得C3H3更倾向于转化为丁二烯(C4H6),而富烯更倾向于通过苯基(C6H5)生成C6H6,因此C6H5作为C6H6前体的地位被加强。

关键词: 热解, 氧气浓度, 对冲扩散火焰, 有机烃类污染物, 反应动力学, 化学分析

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