| 摘要 |
PURPOSE:To compensate the response delay of the temp. of a radiant tube by injecting the gas of a prescribed temp. from nozzle for gas jet provided in the final part of a heating zone and over the entire part of a soaking zone for a short period at every change of the conditions of a metallic strip. CONSTITUTION:The high-temp. gas of about 1,200-1,300 deg.C is supplied from a duct 13 to a pebble heater 12 to maintain the inside of the pebble heater 12 at a high temp. during the time when the metallic strip 1 is treated in a continuous annealing furnace. The supply of the high-temp. gas to the heater 12 is stopped and the gaseous NH of a low temp. is supplied from a duct 14 into the heater 12 when the strip 1 having a thick thickness enters the furnace. The gaseous NH heated to a high temp. in the short period is supplied through ducts 5, 6 into a plenum chamber 4 and is ejected from nozzles 7, 10 to the strip 1, by which the temp. of the strip is increased without time delay. The gaseous NH of the low temp. is injected through a bypass duct 15 to decrease the temp. when the thickness of the plate decreased. The strip 1 is thus annealed to the prescribed temp. without time delay.
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