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Interaction of the combustion of refuse derived fuel with the clinker bed in rotary cement kilns: A numerical study

机译：水泥窑中垃圾衍生燃料燃烧与熟料床的相互作用：数值研究

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摘要

This paper presents CFD simulations of an industrial scale rotary kiln for cement clinker production. The fuel for the kiln flame is a mixture of pulverized coal and a Refuse Derived Fuel (RDF). Advanced models were developed to appropriately describe the thermal conversion characteristics and aerodynamics of non-spherical RDF particles. The models are based on detailed fuel analyses (e.g. flight and combustion characteristics, physical and chemical fuel properties) of major RDF fractions, like plastic foils, 3D plastic particles, paper & cardboard and textiles. The processes in the clinker within the kiln are approximated using a simplified one-dimensional model that calculates heat and mass exchange with the gas phase and the resulting chemical-mineralogical reactions in the solid bed. Calculation results of the one-dimensional model are compared to measurements obtained from a semi-industrial laboratory rotary kiln. Two cases, one with 100% lignite and one where 50% of the fuel heat input is substituted with RDF, are simulated. Based on the simulation results, the shift of flame shape and fuel conversion as well as the resulting effects on the clinker phase transition are analyzed and discussed. Results show that co-combustion of RDF can lead to lower gas and clinker temperatures in the sintering zone, which can affect the clinker properties.
机译：本文介绍了用于水泥熟料生产的工业规模回转窑的CFD模拟。窑火焰的燃料是煤粉和垃圾衍生燃料（RDF）的混合物。开发了高级模型以适当地描述非球形RDF颗粒的热转化特性和空气动力学。这些模型基于主要RDF馏分的详细燃料分析（例如飞行和燃烧特性，物理和化学燃料特性），例如塑料箔，3D塑料颗粒，纸张和纸板以及纺织品。使用简化的一维模型来估算窑内熟料中的过程，该模型可以计算与气相的热和质量交换以及在固相中产生的化学-矿物反应。将一维模型的计算结果与从半工业实验室回转窑获得的测量结果进行比较。模拟了两种情况，一种为100％褐煤，另一种为50％的燃料热输入被RDF替代。基于仿真结果，分析和讨论了火焰形状和燃料转化的变化以及对熟料相变的影响。结果表明，RDF的共燃烧可导致烧结区气体和熟料温度降低，从而影响熟料性能。

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  • 来源
    《Fuel》 |2020年第15期|117048.1-117048.9|共9页
  • 作者

  • 作者单位

    Ruhr Univ Bochum Dept Energy Plant Technol D-44780 Bochum Germany;

    VDZ gGmbH Res Inst Cement Ind D-40476 Dusseldorf Germany;

  • 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

    Cement clinker production; Computational fluid dynamics (CFD); Refuse derived fuel (RDF);

    机译：水泥熟料生产;计算流体动力学（CFD）;垃圾衍生燃料（RDF）;

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