| 摘要 |
PURPOSE:To advantageously utilize atmospheric gas formed by a gas generator, by utilizing atmospheric gas exhausted from one heat treating chamber and supplying to the other heat treating chamber requiring atmospheric gas of lower unburnt component ratio than this. CONSTITUTION:Gaseous C3H7 is burnt by a gas generator 1 under insufficient air state to supply heat generating gas having high unburnt component ratio of reducing gas such as CO, H2 as shown in a table, to the heat treating chamber 2. A substance 5 to be heated is heated in the atmospheric gas in the furnace 2 until required combustion temp. is attained to prevent oxidation thereat. The substance 5 is sent to a slowly cooling chamber 15, the temp. is slowly lowered in the atmospheric gas to maintain tempering state. On the other hand, atmospheric gas exhausted from the chamber 2 is supplied 24 to a conversion apparatus 3, unburnt component such as CO, H2 is oxidized in atmospheric gas contg. O2 to be added 25, the ratios of these unburnt components are decreased as shown in the tale, this is converted to heat generating gas oxidizable weakly and supplied to the second heat treating chamber 4.
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