JPS6479586A - Method of controlling temperature in fluidized-bed thermal treatment equipment - Google Patents

Abstract

PURPOSE: To improve the accuracy of temperature control, and to reduce a waste of heat energy, by performing the large part of cooling of a material to be treated by the water or gas that is exclusive for cooling, and by performing the remainder of cooling by regulating the quantity of fluidized gas, at the time of cooling the material to be treated and providing it with isothermal heat treatment successively. CONSTITUTION: Fluidized gas is ejected into a retort 31 from a dispersion plate 41 to make fluidized particles 51 to form a fluidized bed, and the fluidized bed is heated by heaters 21 and 22. Next, heating is stopped, and the first metal material is charged into the fluidized bed. Since the temperature inside the fluidized bed rises temporarily, a large amount of cooling water is run through water jacket pipes 63 and 64 by a control device 72. Moreover, large quantities of fluidized gas are also fed into a plenum chamber 42, and the metal material is cooled quickly and equally. When a set temperature approaches, the cooling water is stopped. Only relatively small quantities of fluidized gas are fed, and the metal material is maintained at constant temperature. The metal material, which is provided with a predetermined isothermal heat treatment, is discharged from the fluidized bed. From the above, a high quality treated product can be obtained without a waste of heat energy.