| 摘要 |
[Object] In a regenerative-combustion heat treat furnace provided with plural pairs of regenerative burners, the combustion and combustion stop of paired regenerative burners are controlled. When the combustion is restarted in a regenerative burner the stop time of which is prolonged, the drop of flame temperature in this regenerative burner is suppressed so as to ensure a proper heat treatment be performed on a subject material. [Solution] A heat treat furnace 10 is provided with plural pairs of regenerative burners 20 each including a burner portion 21 equipped with a fuel injection nozzle 25 and a regenerator 22 accommodating a heat storage material 22a therein. Even in a case where the combustion in the paired regenerative burners is stopped, at least one regenerative burner of the pair is adapted to introduce a combustion exhaust gas into the regenerator so as to allow the heat storage material to store heat from the combustion exhaust gas. |
