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Modelling of deposit formation and sintering for the co-combustion of coal with biomass

机译：煤与生物质共燃烧的沉积物形成和烧结建模

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摘要

During the combustion of coal and biomass blends, ash particles are deposited on the furnace wall, or on the heat transfer surfaces, and gradually they become sintered and harder. This makes it difficult to remove the deposits by soot blowing, and therefore manual cleaning is often required. In this paper, a computational fluid dynamics (CFD) model that predicts the deposition rates in boilers has been developed. This deposition model is based on the combined sticking probabilities of the ash particle viscosity and the melting behaviour of the ash particles. A numerical slagging index (NSI) is also employed to estimate the degree of the sintering of the deposits. The NSI is based on the ash viscosity, ash fusibility, ash chemistry and ash loading and the experimental data from the entrained flow reactor (EFR) at Imperial College, London, have been used to validate the models. We have found that the predicted results from the ash deposition model on the coal fired with short rotation crop (SRC) and miscanthus are reasonably consistent with the experimental measurements. Further, the NSI has been used to rank the investigated coal-biomass mixtures according to their degree of sintering.
机译：在煤和生物质混合物的燃烧过程中，灰烬颗粒沉积在炉壁或传热表面上，并逐渐变得烧结且变硬。这使得难以通过吹灰去除沉积物，因此经常需要手动清洁。在本文中，已经建立了预测锅炉中沉积速率的计算流体动力学（CFD）模型。该沉积模型基于灰分颗粒粘度和灰分颗粒的熔融行为的组合粘附概率。还使用数值排渣指数（NSI）来评估沉积物的烧结程度。 NSI基于灰分粘度，灰分可熔性，灰分化学性质和灰分负载量，伦敦帝国理工学院的气流床反应器（EFR）的实验数据已用于验证模型。我们已经发现，灰分沉积模型对短轮作（SRC）和桔梗燃煤的预测结果与实验测量值合理地一致。此外，NSI已用于根据其烧结程度对所研究的煤-生物质混合物进行分级。

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  • 来源
    《Fuel》 |2013年第11期|863-872|共10页
  • 作者

    M.U. Garba; D.B. Ingham; L.Ma; M.U. Degereji; M. Pourkashanian; A. Williams;

  • 作者单位

    CFD Centre, Energy Technology and Innovation Initiative, Faculty of Engineering, University of Leeds, Leeds LS2 9JT, UK;

    CFD Centre, Energy Technology and Innovation Initiative, Faculty of Engineering, University of Leeds, Leeds LS2 9JT, UK;

    CFD Centre, Energy Technology and Innovation Initiative, Faculty of Engineering, University of Leeds, Leeds LS2 9JT, UK;

    CFD Centre, Energy Technology and Innovation Initiative, Faculty of Engineering, University of Leeds, Leeds LS2 9JT, UK;

    CFD Centre, Energy Technology and Innovation Initiative, Faculty of Engineering, University of Leeds, Leeds LS2 9JT, UK;

    CFD Centre, Energy Technology and Innovation Initiative, Faculty of Engineering, University of Leeds, Leeds LS2 9JT, UK;

  • 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

    Co-firing; CFD model; Ash deposition; Slagging index;

    机译：共烧;差价合约模型灰分沉积;结渣指数;

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