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Development of a three-dimensional computational slag flow model for coal combustion and gasification

机译：煤燃烧和气化的三维渣流计算模型的建立

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摘要

Slagging and fouling are important phenomena associated with ash handling and discharge in coal combustion and gasification. Slagging may have strong impact on the heat transfer characteristics in the reactor, and may cause reliability and safety concerns. A novel, fully three-dimensional slag model has been developed for modeling the slag flow characteristics including char/ash deposition and molten slag flow on the reactor wall. The model couples two multiphase flow models, i.e., the Volume of Fluid (VOF) model and the Discrete Phase Model (DPM), to describe the gas phase, slag phase, and solid particle phase in slagging coal combustion. The model is implemented in the form of User Defined Functions (UDFs) in a three-dimensional Computational Fluid Dynamics (CFD) code, and applied for the simulation of slag flow in a full three-dimensional pilot scale coal slagging combustion facility. Including the particle dispersion model is necessary for accurate prediction of particle deposition rate near the wall. The simulation result shows that a thin molten slag layer up to 1-2 mm is built up on the refractory wall in about 5 h. The slag flows downward on the side wall, accumulates on the bottom and exits at the bottom end of the reactor, mainly driven by gravity. The average slag flow velocity is generally about 0.1 mm/s. Experimental result in the test facility was compared with the simulation results, and the simulation results on ash particle deposition, slag thickness and flow velocity agree qualitatively well with the experimental observations.
机译：结渣和结垢是与煤燃烧和气化中的灰分处理和排放相关的重要现象。结渣可能会对反应器中的传热特性产生重大影响，并可能引起可靠性和安全性问题。已经开发了一种新颖的全三维熔渣模型，用于对熔渣流动特性进行建模，包括炭/灰沉积和反应炉壁上的熔渣流动。该模型耦合了两个多相流模型，即流体体积（VOF）模型和离散相模型（DPM），以描述炉渣燃煤过程中的气相，炉渣相和固体颗粒相。该模型以三维计算流体动力学（CFD）代码中的用户定义函数（UDF）的形式实现，并用于模拟全尺寸中试规模煤渣燃烧设施中的炉渣流。为了准确预测壁附近的颗粒沉积速率，必须包含颗粒扩散模型。模拟结果表明，在约5小时内，耐火壁上会形成一层厚度达1-2 mm的薄熔渣层。炉渣在侧壁上向下流动，在底部积聚并在反应器的底端排出，这主要是靠重力驱动的。平均炉渣流速通常为约0.1mm / s。将测试设备中的实验结果与模拟结果进行了比较，灰分沉积，炉渣厚度和流速的模拟结果与实验结果在质量上基本吻合。

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  • 来源
    《Fuel》 |2013年第11期|357-366|共10页
  • 作者

    Lei Chen; Ahmed F. Ghoniem;

  • 作者单位

    Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307, USA;

    Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307, 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

    Slag; Coal combustion; Gasification; VOF; CFD;

    机译：矿渣;燃煤;气化;VOF;差价合约;

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