Abstract: A gas diffusing nozzle device for a fluidized bed furnace having high thermal resistance and durability especially, in a high-temperature environment and capable of being manufactured at a low cost, fluidizing a fluid layer uniformly using a fluidized gas jet with a low pressure loss and controlling the flow rate of the fluidized gas jet at the outer circumferential and central portions of the interior of a retort (11) in an arbitrary and individual manner. This device is provided with a circumferential gas supply pipe (19), a central gas supply pipe (24), and a circumferential gas diffusing nozzle section (14) and a central gas diffusing nozzle section (15) respectively connected to these two gas supply pipes. Each of the gas diffusing nozzle sections has a plurality of nozzle pipes (16b, 22) with a plurality of downwardly directed fluid gas ejection ports (17) formed in the lower surfaces thereof, and at least one ring-shaped nozzle pipe (16a, 21) joined to the free ends of these nozzle pipes.

Abstract: A heat treatment apparatus for metals or metal articles has a fluidized-bed furnace for heating the metals and a cooling chamber disposed above the furnace so as to communicate with a heating chamber of the furnace through a partition capable of being opened and closed, so that the metals can be cooled immediately after heated. The apparatus further includes a circulating circuit arrangement with a heat-resisting fan for circulating together or separately heated furnace gas and cooling fluid. Flow rate of the circulating furnace gas and/or cooling fluid is controlled by a flow rate control device provided in the circulating circuit.

Abstract: An incineration equipment for removing organic substances from various parts of an extruder in a plastics forming machine, has a combustion chamber formed in the upper portion of a heating furnace accommodating a fluidized-bed consisting of refractory particles therein, into which furnace the various parts are to be thrown, and a burning system for heating the fluidized-bed and also for causing gaseous decomposed polymers produced by thermal decomposition of the organic substances and mixed with air fed from the bottom of the furnace through a porous dispersion plate to burn in the combustion chamber. This burning system connects through a single directional control valve with a fuel tank and an air tank, and it comprises a burner having its tip end opened in the combustion chamber, and a temperature sensor for sensing the temperature in the furnace and outputting an operation signal for actuating the directional control valve in accordance with the sensed furnace temperature.