Дослідження теплообміну між наскрізним потоком газу та щільним шаром гранульованого матеріалу

Abstract

On the basis experimental studies, the specific features of the heat exchange process between the granular packing and the through flow of the gaseous (air) medium are determined. Experimental studies of heat exchange between a dense layer of granular material and a stream of heated air have been carried out. The conditions for increasing the efficiency of the heat recovery unit are established. The course of the temperature curve for the gas flow and solid components at the inlet and outlet of the installation indicates the presence of two clearly pronounced regions with different heating rates. It is assumed that it is expedient to set the heating time in the heat accumulator with a stationary nozzle within the first period, which is characterized by a high rate of heating. It is found that the heat exchange rate increases with a mixture of particles of different sizes. It is established that the coefficients of intercomponent heat transfer during heating of the fixed nozzle depend on the gas velocity, the velocity of the ball, the temperature of the gas at the inlet to the apparatus, the duration of the process, and are described by a function of the sigmoid class