| 摘要 |
PURPOSE: To permit cooling within a comparatively short period of time by a method wherein cooling gas is conducted into one direction only and the cooling gas is introduced into a heat storage unit at the other end, upon cooling a heat storage type radiant tube burner equipped with a burner and a heat storage unit at both ends of a radiant tube respectively. CONSTITUTION: A heat storage type radiant tube burner 21, mounted on a heat treatment furnace 11, is provided with burners 41, 42 and heat storage units 51, 52 respectively at both ends of a U-shape radiant tube 31. Upon cooling such a radiant tube 31 when the heat treatment furnace 11 is shifted from heating into cooling, a four-way switching valve 61 is switched to conduct cooling air, supplied through a gas supplying pipe 71, into one direction only through the route of four-way switching valve 61 → heat storage unit 51 →radiant tube 31 → heat storage unit 52 → flour-way valve 61 →gas discharging pipe 81. On the other hand, cooling air is introduced from a cooling gas introducing pipe 91 at the downstream side of the heat storage unit 52 at the other end simultaneously with the switching of the four-way switching valve 61 whereby cooling time is shortened. |
