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Mechanistic modeling, numerical simulation and validation of slag-layer growth in a coal-fired boiler

Author

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  • Balakrishnan, S.
  • Nagarajan, R.
  • Karthick, K.

Abstract

In a tangentially coal-fired boiler, for locations inside and near the combustor, heat-transfer by radiation is significant, and hence, ash particles arrive in molten state. The aim of the present study is to adopt a mechanistic modeling approach which incorporates energy-conservation principles to address slag-layer growth. In order to determine the outcome of molten ash impaction, a mechanistic bouncing potential model, incorporating the phenomenon of recoiling of molten ash droplets after impaction, is employed. The bouncing potential is a representation of the excess energy possessed by the recoiling splat, and is used to determine the outcome of molten ash impaction – to stick or to bounce. Computational fluid dynamics techniques, incorporating the effect of thermophoresis, are adopted to estimate the arrival rate of ash particles, and the bouncing potential model, as a user-defined function, is incorporated in the simulation package to determine the status of the droplets after impaction. Two coals of Indian origin are simulated for slag-layer growth for a period of 100 min. The simulation results, when compared with field data provided by BHEL-Trichy, indicate that the model qualitatively predicts the growth of slag-layers. It has been further inferred that smaller particles dominate deposit formation and its growth.

Suggested Citation

  • Balakrishnan, S. & Nagarajan, R. & Karthick, K., 2015. "Mechanistic modeling, numerical simulation and validation of slag-layer growth in a coal-fired boiler," Energy, Elsevier, vol. 81(C), pages 462-470.
    • Handle: RePEc:eee:energy:v:81:y:2015:i:c:p:462-470
    DOI: 10.1016/j.energy.2014.12.058
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    Cited by:

    1. Chen, Zhichao & Yuan, Zhenhua & Zhang, Bo & Qiao, Yanyu & Li, Jiawei & Zeng, Lingyan & Li, Zhengqi, 2022. "Effect of secondary air mass flow rate ratio on the slagging characteristics of the pre-combustion chamber in industrial pulverized coal-fired boiler," Energy, Elsevier, vol. 251(C).
    2. Hamid Sefidari & Bo Lindblom & Lars-Olof Nordin & Henrik Wiinikka, 2020. "The Feasibility of Replacing Coal with Biomass in Iron-Ore Pelletizing Plants with Respect to Melt-Induced Slagging," Energies, MDPI, vol. 13(20), pages 1-25, October.
    3. Cai, Yongtie & Tay, Kunlin & Zheng, Zhimin & Yang, Wenming & Wang, Hui & Zeng, Guang & Li, Zhiwang & Keng Boon, Siah & Subbaiah, Prabakaran, 2018. "Modeling of ash formation and deposition processes in coal and biomass fired boilers: A comprehensive review," Applied Energy, Elsevier, vol. 230(C), pages 1447-1544.

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