Abstract
This paper presents the results of an experimental study of the external heat-exchange with a tube bundle in a bidisperse fluidized bed with marked bimodality of particle size distribution. The dependence of the maximum heat-transfer coefficient on the rate of air filtration was determined. The influence of the mass fraction of large particles on the heat-transfer coefficient in a mixture has been established. An interpolation dependence for calculating the optimal filtration rate of the investigated mixtures has been obtained. It is recommended to use the average surface diameter of the polydisperse particles mixture as the equivalent diameter when calculating the heat-exchange. A method for calculating the maximum heat-transfer coefficient and the optimal filtration rate for a quasi-bidisperse fluidized bed has been developed. The method is based on the use of heat transfer coefficients and optimal filtration rates of individual components of the bidisperse mixture. The equations for calculating the maximum heat-transfer coefficient and the optimal filtration rate in the bidisperse mixture has been obtained.
Highlights
This paper presents the results of an experimental study of the external heat-exchange with a tube bundle in a bidisperse fluidized bed with marked bimodality of particle size distribution
It is recommended to use the average surface diameter of the polydisperse particles mixture as the equivalent diameter when calculating the heat-exchange
The method is based on the use of heat transfer coefficients and optimal filtration rates of individual components of the bidisperse mixture
Summary
Приведены результаты экспериментального исследования внешнего теплообмена с трубным пучком в псевдоожиженном бидисперсном слое с выраженной бимодальностью распределения частиц по размерам. Установлены зависимость коэффициента теплоотдачи от скорости фильтрации воздуха, влияние массовой доли крупных частиц в смеси на максимальный коэффициент теплоотдачи. Получена интерполяционная зависимость для расчета оптимальной скорости фильтрации исследуемых смесей. В качестве эквивалентного диаметра при расчете теплоотдачи рекомендовано использовать среднеповерхностный диаметр частиц полидисперсной смеси. Разработана методика расчета максимального коэффициента теплоотдачи и оптимальной скорости фильтрации для квазибидисперсного кипящего слоя. Метод основан на использовании коэффициентов теплоотдачи и оптимальных скоростей фильтрации отдельных составляющих бидисперсной смеси. Получены уравнения для расчета максимального коэффициента теплоотдачи и оптимальной скорости фильтрации в бидисперсной смеси. Ключевые слова: теплообмен, кипящий слой, бидисперсный слой, эквивалентный диаметр, максимальный коэффициент теплоотдачи, оптимальная скорость фильтрации.
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