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Ash management in circulating fluidized bed combustors

机译：循环流化床燃烧器的灰分管理

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Ash management in fluidized bed combustion systems means keeping the particle size distribution of the bed inventory in a given range. A dynamic particle population balancing model was developed for this purpose. It was successfully applied to a refuse-derived fuel fired combustor and a coal-fired circulating fluidized bed combustor. Both were large-scale commercial units. The model uses the concept of the attr-ited ash particle size distribution which represents the particle size distribution of the attrited ash including the generated fines and replaces the consideration of the particle attrition in the model calculations. The model offers the possibility to gain additional information about the particle size distributions and the solids mass flows at any location of the fluidized bed system. In addition, the model provides information about the dynamic behavior of the plant and about mean residence times of particle size classes in the plant. Uncertainties about the ash formation characteristics of fuels make the management of the bed inventory a very important issue. In this context the population balancing model is used to predict the plant behavior under various operating conditions. The results of the calculations carried out give useful information about the possibilities to manage the ash inventory of such a plant. It could be shown that the recircu-lation of a fine fraction of the bottom drain solids is a very effective method to manage the particle size distribution of the bed inventory. The calculation results further reveal that the mean residence time of particles is strongly dependent on their size.
机译：流化床燃烧系统中的灰分管理意味着将床层物料的粒度分布保持在给定范围内。为此，开发了动态粒子种群平衡模型。它已成功应用于垃圾衍生燃料燃烧室和燃煤循环流化床燃烧室。两者都是大型商业单位。该模型使用了灰烬粒度分布的概念，该概念代表了包括产生的细粉在内的灰烬粒度分布，并取代了模型计算中对颗粒磨损的考虑。该模型提供了获得有关粒度分布和流化床系统任何位置的固体质量流量的其他信息的可能性。此外，该模型还提供有关植物动态行为的信息，以及有关植物中颗粒大小类别的平均停留时间的信息。燃料灰分形成特性的不确定性使得床层库存的管理成为一个非常重要的问题。在这种情况下，种群平衡模型用于预测各种操作条件下的工厂行为。进行的计算结果提供了有关管理此类工厂灰分存量的可能性的有用信息。可以表明，细小部分底部排水固体的再循环是一种非常有效的方法，可以管理床层物料的粒度分布。计算结果进一步表明，颗粒的平均停留时间很大程度上取决于其尺寸。

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