Continuous heating furnace

A continuous heating furnace comprising:

• a furnace main body;
• a conveyance unit configured to convey a baking object in the furnace main body;
• at least one closed type gas heater having an introduction hole into which a fuel gas flows, a combustion chamber in which the fuel gas introduced from the introduction hole is combusted, a guide section configured to guide an exhaust gas generated by combustion in the combustion chamber, a first radiation surface extending in a direction perpendicular to a conveyance direction of the baking object and parallel to a horizontal direction and configured to be heated by the combustion in the combustion chamber and heat of the exhaust gas flowing through the guide section to transfer radiant heat to the baking object, an exhaust hole through which the exhaust gas that heated the first radiation surface is discharged, the at least one closed type gas heater being disposed in the furnace main body,
• wherein all of the exhaust gas generated by combustion in the combustion chamber is discharged to an area outside of the at least one closed type gas heater from the exhaust hole without coming in direct contact with the baking object;
• and
• at least one exhaust heat transfer unit which is juxtaposed with the at least one closed type gas heater in the conveyance direction of the baking object, is disposed in the furnace main body, communicates with the exhaust hole so that the exhaust gas discharged from the exhaust hole flows through the at least one exhaust heat transfer unit, and has a second radiation surface configured to be heated by the exhaust gas discharged from the exhaust hole to transfer the radiant heat to the baking object, and a heat transfer acceleration unit provided at one end portion, in the direction perpendicular to the conveyance direction of the baking object and parallel to the horizontal direction, of the at least one exhaust heat transfer unit and configured to accelerate heat transfer from the exhaust gas discharged from the exhaust hole to one end portion of the second radiation surface, wherein all of the exhaust gas discharged from the exhaust hole passes through the at least one exhaust heat transfer unit and is discharged to an area outside of the at least one exhaust heat transfer unit and the continuous heating furnace without coming in direct contact with the baking object.