| 摘要 |
A billet is transported through an improved furnace by convention means and is heated in the furnace by an external burner unit in which fuel and air are combusted together and then injected at a high velocity into a semi-cylindrical chamber of the furnace tangentially to the billet so as to create a hot vortex of gases circulating around the billet along the length of the furnace. The temperature of the hot gas vortex within the furnace is sensed by means of a thermocouple placed close to the billet surface but not in contact with it so as to sense the temperature of the billet as a function of the temperature of the circulating gas. The temperature of the injected gas is thereby controlled to heat the billet to a desired temperature and then maintain it at that temperature.
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