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首页> 外文期刊>Combustion Science and Technology >THERMAL REACTION MODELING OF A LARGE MUNICIPAL SOLID WASTE INCINERATOR
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THERMAL REACTION MODELING OF A LARGE MUNICIPAL SOLID WASTE INCINERATOR

机译：大型城市固体垃圾焚烧炉的热反应模型

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In a mass burn waste incinerator, the waste undergoes combustion in the bed on the grate and the products of incomplete combustion are destroyed in the gas plenum above the bed. Thus, it is essential to consider the reaction in both the waste bed and the gas plenum when evaluating the combustion performance using computational fluid dynamics (CFD). However, solving the two-phase reacting bed of waste is not straightforward in CFD simulations. This paper presents the combustion and gas flow of a waste incinerator using a new simulation approach that incorporates two models: FLIC for the reacting bed of solid fuels and FLUENT for the turbulent reacting flow of the gas plenum. The two models were linked through the boundary conditions on the waste bed in such a manner that FLIC provides the gas properties leaving the bed as an inlet condition of the gas flow and FLUENT produces the radiation transferred to the bed. The predicted results were compared with on-site measurements in the plant by a novel instrument that collected the temperature, oxygen concentration, and motion data while tumbling with the waste particles within the bed. The measured data were highly fluctuating, but FLIC satisfactorily predicted the overall trend of temperature and oxygen concentration including the upper and lower boundaries of the violent fluctuations. The FLIC/FLUENT combined simulation provided crucial information on the nature of combustion and flow characteristics such as the ignition and burnout points of waste, the rates of each combustion process, and the subsequent gas flow pattern in the combustion chamber.
机译：在大规模燃烧废物焚化炉中，废物在炉床上的炉排上进行燃烧，不完全燃烧的产物在床上方的气室中被破坏。因此，在使用计算流体力学（CFD）评估燃烧性能时，必须考虑废物床和气室中的反应。但是，在CFD模拟中解决废物的两相反应床并不是一件容易的事。本文使用一种新的模拟方法介绍了垃圾焚烧炉的燃烧和气体流动，该模拟方法结合了两个模型：用于固体燃料反应床的FLIC和用于气体增压室湍流反应流的FLUENT。两种模型通过废物床的边界条件进行链接，以使FLIC提供离开床的气体特性作为气流的进入条件，而FLUENT产生转移到床的辐射。通过一种新颖的仪器将预测的结果与工厂中的现场测量结果进行比较，该仪器收集温度，氧气浓度和运动数据，同时与床内的废物颗粒一起翻滚。测得的数据波动很大，但FLIC令人满意地预测了温度和氧气浓度的总体趋势，包括剧烈波动的上下边界。 FLIC / FLUENT组合模拟提供了有关燃烧性质和流动特性的重要信息，例如废物的着火点和燃尽点，每个燃烧过程的速率以及燃烧室内随后的气体流动方式。

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