Ihi Corporation

Masao Aihara

Toshiyuki Suda

Toshiro Fujimori

Kimiyoshi Satoh

Hidenari Baba

A heating furnace includes a target space () in which a burning target is disposed, and a furnace main body () that surrounds the target space. The heating furnace includes one or more closed gas heaters having an introduction hole configured to introduce a fuel gas into the main body, a combustion chamber in which the introduced fuel gas is combusted, a discharge section to which an exhaust gas generated by combustion is guided, a radiation surface heated by the exhaust gas flowing through the discharge section or combustion in the combustion chamber and configured to transfer radiant heat to the burning target, and an exhaust hole configured to exhaust the exhaust gas that heats the radiation surface to the outside of the main body, and disposed in the furnace main body, and an exhaust heat transfer section (an insulated pipe ()) in communication with the exhaust hole of the closed gas heater and to which the exhaust gas is guided. In addition, the exhaust heat transfer section is installed at any portion in the furnace main body except for a radiation space () formed between the closed gas heater and the burning target disposed in the target space and configured to transfer the radiant heat to the burning target.

Heating furnace and continuous heating furnace

A continuous heating furnace () includes a conveyance body () stretched in an endless shape and configured to convey a burning target, a furnace main body () partially or entirely surrounding the conveyance body to form a burning space, and a roller () configured to support a portion of the conveyance body in the furnace main body. The continuous heating furnace () further includes one or more closed gas heaters having an introduction hole configured to introduce a fuel gas into a heater main body, a combustion chamber in which the fuel gas is combusted, a discharge section to which an exhaust gas is guided, a radiation surface heated by the exhaust gas flowing through the discharge section or combustion in the combustion chamber and configured to transfer radiant heat to a burning target, and an exhaust hole configured to exhaust the exhaust gas that heats the radiation surface to the outside of the heater main body, and disposed in the furnace main body, and an exhaust pipe () in communication with the exhaust hole of the closed gas heater and through which the exhaust gas is guided. In addition, the exhaust pipe enables heat exchange between the exhaust gas flowing through the exhaust pipe and the roller.

Continuous heating furnace

Provided is a combustion heater (), which includes a heating plate (), a layout plate () disposed opposite to the heating plate, an annular outer circumferential wall () interposed between the heating plate and the layout plate, clipping parts () configured to sandwich the heating plate, the layout plate, and the outer circumferential wall so that at least one of the heating plate and the layout plate is allowed to expand in an extending direction thereof, a partition plate () disposed between the heating plate and the layout plate, a combustion chamber () disposed inside the outer circumferential wall along the outer circumferential wall, an inflow passage () configured to flow fuel gas into the combustion chamber using the layout plate and the partition plate as a lateral wall thereof, and an outflow passage () configured to discharge exhaust gas from the combustion chamber to an outside using the heating plate and the partition plate as a lateral wall thereof, and to preheat the fuel gas using heat of the exhaust gas via the partition plate. According to the combustion heater, thermal fatigue caused by repetition of heating and cooling can be suppressed.

Growing community of inventors

Tokyo, Japan

Masao Aihara