PURPOSE: To decrease draft pressure loss in a stationary bed layer, and the necessary power to operate an apparatus, as well as to make the size of an apparatus compact, by recovering heat from particles by classifying the particles containing wide range of particle size distribution into fine particles and coarse particles utilizing the classifying performance of a fluidized bed layer.
CONSTITUTION: A particle group 3 in high temperature is divided into a stationary bed layer 20 mainly consisting of coarse particles, and a fluidized bed layer 17 consisting of fine particles 18 on the top of a stationary bed layer 20. Then the average particle diameter in the stationary bed layer 20 is larger than that in the particle group 3 in high temperature, consequently the pressure loss in the stationary bed layer 20 is remarkably lowered when gas is ventilated through the layer 20. Because few fine particles 18 are in presence in the stationary bed layer 20, deviation is very little in a gas flow, so that particles can be uniformly cooled. The pressure loss in the fluidized bed layer 17 of fine particles 18 is equivalent to the value that is obtained from total weight of fine particle 18 divided by the sectional area of a fluidized bed layer 17. This value is far more lower value than a stationary bed layer or a fluidized bed layer consisting of fine particles 18 only.
TAODA KIYOMICHI
SASAKI ATSUSHI
