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Comparison of particulate formation and ash deposition under oxy-fuel and conventional pulverized coal combustions

机译：含氧燃料和传统煤粉燃烧下颗粒形成和灰分沉积的比较

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摘要

The characteristics of both particulate formation and ash deposition play an important role in retrofitting the conventional air-fired coal power plant into the recycled oxy-fuel plant. In this paper, an intensively comparative study was performed with a 25 kW quasi one-dimensional down-fired pulverized coal com-bustor for clarifying the differences between air combustion and recycled oxy-fuel combustion of bituminous coal. In oxy-fuel mode, the volume recycle ratio of flue gas (dry basis) was kept at 77.8%, and then the oxygen concentration at 30% to provide a similar heat flux output to the air mode. A nitrogen-aspirated, isokinetic particulate sampling probe, followed by either electric low-pressure impactor (ELPI) or scanning mobility particle spectroscopy (SMPS), was introduced to measure fine particulates, while an air-cooled deposition probe was designed to collect ash deposit samples. The results indicated that, under similar furnace temperature profiles, the oxy-fuel combustion leads to the higher fine particulate formation, finer bulk ash particle formation and lower ash deposition. The aerodynamic factor, instead of the chemical composition related to fine particulates, determines the difference in the ash deposition behavior in two combustion modes.
机译：颗粒形成和灰分沉积的特征在将传统的空燃煤电厂改建为可循环使用的氧气燃料电厂中起着重要作用。在本文中，使用25 kW准一维向下燃烧的粉煤燃烧器进行了深入的比较研究，以阐明烟煤的空气燃烧与循环氧燃料燃烧之间的差异。在含氧燃料模式下，烟气（干基）的体积循环比保持在77.8％，然后氧浓度为30％，以提供与空气模式相似的热通量输出。引入了氮气抽吸等速颗粒采样探针，然后使用低压冲击器（ELPI）或扫描迁移率粒子光谱仪（SMPS）来测量细颗粒，同时设计了空冷沉积探针来收集灰分沉积物样品。结果表明，在相似的炉温曲线下，氧-燃料燃烧导致较高的细颗粒形成，较细的散装灰分颗粒形成和较低的灰分沉积。空气动力学因素决定了两种燃烧模式下灰分沉积行为的差异，而不是与细颗粒物相关的化学组成。

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  • 来源
    《Fuel》 |2013年第4期|544-551|共8页
  • 作者

    Gengda Li; Shuiqing Li; Ming Dong; Qiang Yao; Cliff Y. Guo; Richard L. Axelbaum;

  • 作者单位

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    The National Institute of Clean-and-Low-Carbon Energy, Changping Dist., Beijing 102209, China;

    Consortium for Clean Coal Utilization, Washington University in Saint Louis, St. Louis, MO 63130, USA;

  • 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-coal combustion; recycled flue gas; ash particles; ash deposition;

    机译：氧煤燃烧;循环烟气;灰粒;灰分沉积;

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