| 摘要 |
<p>A heating furnace is provided with: an object space (212a) in which an object to be fired is disposed; and a furnace body (212) which surrounds the object space. The heating furnace is provided with: one or more closed type gas heaters each comprising an inflow hole through which fuel gas flows into the body thereof, a combustion chamber in which the fuel gas that has flowed in is burned, a lead-through part through which exhaust gas generated by the burning is led, a radiation surface which is heated by the exhaust gas flowing through the lead-through part or the burning in the combustion chamber and transfers radiant heat to the object to be fired, and an exhaust hole through which the exhaust gas that has heated the radiation surface is discharged to the outside of the body, and each being disposed in the furnace body; and an exhaust heat transfer unit (heat retention pipe (222a)) which communicates with the exhaust hole of the closed type gas heater and to which the exhaust gas is led. The exhaust heat transfer unit is provided in any region other than a radiation space (212b) within the furnace body, the radiation space being formed between the closed type gas heater and the object to be fired disposed in the object space and transferring the radiant heat to the object to be fired.</p> |
