垃圾衍生燃料流化床燃烧特数值研究

发布时间：2018-01-22 12:28

  本文关键词： 垃圾衍生燃料 流化床 数值研究 两相流 曳力模型　出处：《沈阳航空航天大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来流化床技术的应用领域已经成功扩展到生物质和固体废物燃料的处理方面,由于流化床具有燃烧效率高,污染排放低,燃料适应性广的优点,已经成为固废焚烧处理的主要设备。本文在实验的基础上,用基于颗粒动力学理论(Kinetic Theory of Granular Flow,KTGF)的欧拉-欧拉两相流模型和燃烧模型,分别研究了在床料颗粒在流化床中的冷态流动特性,床料与垃圾衍生燃料(Refuse Derived Fuel,RDF)的混合流动特性以及流化床传热和燃烧特性的影响因素。对比分析了气固流动中,气体和固体颗粒之间相互影响的规律,包括气泡随时间的演变机理。以及不同曳力模型在本模型中的应用对环核结构的影响,流化速度对床内流场分布和床层膨胀的影响,并且得到了实验的良好验证。对于传热和燃烧状态下的速度场,温度场,浓度场的分布对燃烧、换热效率及污染物排放的影响。并与实验值进行了对比验证。本文有关研究结果与试验相符合,对RDF在流化床中燃烧的实际工程应用具有重要参考价值。
[Abstract]:In recent years, the application of fluidized bed technology has been successfully expanded to biomass and solid waste fuel treatment, because fluidized bed has the advantages of high combustion efficiency, low pollution emissions, wide fuel adaptability. It has become the main equipment for solid waste incineration treatment. In this paper, based on particle dynamics theory, Kinetic Theory of Granular Flow is used. KTGF-based Euler-Euler two-phase flow model and combustion model were used to study the cold flow characteristics of particles in fluidized bed. The mixed flow characteristics of Refuse Derived fuel and the influencing factors of heat transfer and combustion characteristics of fluidized bed are compared and analyzed in gas-solid flow. The interaction between gas and solid particles, including the evolution mechanism of bubbles with time, and the effect of different drag models on the ring nuclear structure in this model. The effect of fluidization velocity on the flow field distribution and bed expansion in the bed is well verified by experiments. For the velocity field, temperature field and concentration field under the heat transfer and combustion state, the distribution of the velocity field and the concentration field on the combustion. The effects of heat transfer efficiency and pollutant emission are compared with the experimental data. The results of this paper are in agreement with the experimental results, and have important reference value for the practical engineering application of RDF combustion in fluidized bed.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X705;TK16
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本文编号：1454666