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An investigation of the causes of the difference in coal particle ignitiontemperature between combustion in air and in O_2/CO_2

机译:空气燃烧与O_2 / CO_2燃烧之间煤粉着火温度差异的原因研究

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摘要

The ignition temperatures of a Loy Yang brown coal and a Datong bituminous coal were investigated in a wire-mesh reactor where the secondary reactions of the evolved volatiles were minimised. An increase in the average particle ignition temperature of 21 ℃ was observed for the brown coal when air (21% O_2 + 79% N_2) was replaced with a mixture of 21% O_2 + 79% CO_2. Combustion was also carried out in the mixtures of 21% O_2 + 79% argon and 21%O_2 + 79% helium in order to determine the effects of heat transfer on the observed particle ignition temperature. It is concluded that the thermal conductivity of gas atmosphere surrounding the particles greatly influences the observed particle ignition temperature while the effects of the heat capacity of the gas atmosphere was very minor under our experimental conditions. The structure of char and the reactions involving the char (char-O_2 and char-CO_2) can greatly affect the observed particle ignition temperature. In particular, the char-CO_2 reactions were largely responsible for the observed difference in particle ignition temperature in air and in 21% O_2 + 79% CO_2. Alkali and alkaline earth metallic (AAEM) species in the brown coal also significantly affect the observed particle ignition temperature.
机译:在金属丝网反应器中研究了Loy Yang褐煤和大同烟煤的着火温度,在这种反应器中,所产生的挥发物的副反应被最小化。当用21%O_2 + 79%CO_2的混合物代替空气(21%O_2 + 79%N_2)时,褐煤的平均颗粒着火温度增加了21℃。为了确定传热对观察到的粒子着火温度的影响,还对21%O_2 + 79%氩气和21%O_2 + 79%氦气的混合物进行了燃烧。结论是,在我们的实验条件下,包围颗粒的气体气氛的热导率极大地影响了观察到的颗粒着火温度,而气体气氛的热容量的影响很小。炭的结构和涉及炭的反应(炭-O_2和炭-CO_2)会极大地影响观察到的颗粒着火温度。特别是,在空气中和21%O_2 + 79%CO_2中,观察到的颗粒着火温度差异是造成char-CO_2反应的主要原因。褐煤中的碱金属和碱土金属(AAEM)种类也显着影响观察到的颗粒着火温度。

著录项

  • 来源
    《Fuel》 |2010年第11期|P.3381-3387|共7页
  • 作者单位

    Department of Chemical Engineering. Monash University, P.O. Box 36. Monash, Victoria 3800, Australia;

    rnDepartment of Chemical Engineering. Monash University, P.O. Box 36. Monash, Victoria 3800, Australia;

    rnDepartment of Chemical Engineering. Monash University, P.O. Box 36. Monash, Victoria 3800, Australia;

    rnState Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;

    rnDepartment of Chemical Engineering. Monash University, P.O. Box 36. Monash, Victoria 3800, Australia Curtin Centre for Advanced Energy Science and Engineering, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia;

  • 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

    oxy-fuel combustion; ignition delay; brown coal; bituminous coal; wire-mesh reactor;

    机译:氧燃料燃烧;点火延迟褐煤;烟煤;丝网反应器;

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