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首页> 外文期刊>Fuel >Predicting ash deposition behaviour for co-combustion of palm kernel with coal based on CFD modelling of particle impaction and sticking
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Predicting ash deposition behaviour for co-combustion of palm kernel with coal based on CFD modelling of particle impaction and sticking

机译：基于粒子撞击和黏附的CFD模型预测棕榈仁与煤共燃的灰分沉积行为

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摘要

A CFD model that simulates particle impaction and sticking has been developed for predicting the ash deposition characteristics for the co-combustion of South African Coal (SAC) and palm kernel expeller (PKE) in an entrained flow reactor. The numerical related errors, caused by interception and the improper resolving of the flow-field within the boundary layer near the deposition surface, are investigated. In order to minimize the numerical related errors without excessive meshing, a new revised particle impaction model has been developed and accomplished using an impaction correction factor. The particle sticking is predicted based on the molten fraction results that have been obtained from the chemical equilibrium calculations using the chemical fractionation data in order to consider the short residence time of fly ash particles. The simulation results show that a reasonable coarse mesh, coupled with the revised particle impaction model, is suitable to accurately resolve the particle impaction without using a prohibitive meshing size. The ash deposition behaviour is determined by the particle impaction and sticking properties. Good agreements are obtained between the predicted results and the experimental data for the ash deposition behaviour. (C) 2015 Elsevier Ltd. All rights reserved.
机译：已经开发出一种模拟颗粒撞击和粘附的CFD模型，用于预测在夹带流反应器中南非煤（SAC）和棕榈仁推进器（PKE）共同燃烧的灰分沉积特性。研究了由沉积表面附近边界层内流场的拦截和不正确解析引起的与数值相关的误差。为了在不进行过多网格划分的情况下最小化与数值相关的误差，已经开发了一种新的修改后的粒子碰撞模型，并使用了碰撞校正因子来完成该模型。基于熔融分数的结果预测了颗粒的粘附，该熔融分数的结果是使用化学分馏数据从化学平衡计算中获得的，以便考虑粉煤灰颗粒的短停留时间。仿真结果表明，合理的粗网格与修改后的粒子碰撞模型相结合，可以准确地解决粒子碰撞，而无需使用过大的网格大小。灰分沉积行为取决于颗粒的撞击和粘附特性。灰分沉积行为的预测结果与实验数据之间取得了良好的一致性。 （C）2015 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Fuel》 |2016年第1期|41-49|共9页
  • 作者

    Yang Xin; Ingham Derek; Ma Lin; Williams Alan; Pourkashanian Mohamed;

  • 作者单位

    Univ Sheffield, Dept Mech Engn, Energy Engn Grp, Energy 2050, Sheffield S10 2TN, S Yorkshire, England;

    Univ Sheffield, Dept Mech Engn, Energy Engn Grp, Energy 2050, Sheffield S10 2TN, S Yorkshire, England;

    Univ Sheffield, Dept Mech Engn, Energy Engn Grp, Energy 2050, Sheffield S10 2TN, S Yorkshire, England;

    Univ Leeds, Sch Chem & Proc Engn, Energy Res Inst, Leeds LS2 9JT, W Yorkshire, England;

    Univ Sheffield, Dept Mech Engn, Energy Engn Grp, Energy 2050, Sheffield S10 2TN, S Yorkshire, England;

  • 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

    Ash deposition; CFD; Revised particle impaction model; Particle sticking; Co-firing;

    机译：灰分沉积;CFD;修正的粒子碰撞模型;颗粒附着;共烧;

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