DEVICE AND METHOD FOR REDUCING DEW POINT OF AMBIENT GAS IN ANNEALING FURNACE, AND METHOD FOR PRODUCING COLD-ROLLED ANNEALED STEEL PLATE

摘要

In the present invention, a portion of the ambient gas of a heating zone (1) and/or a soaking zone is sucked out, passed through the high-temperature gas duct of a heat exchanger (9) to be cooled by means of heat exchange with a gas within a low-temperature gas duct, then cooled by means of passing through a gas cooling device (10), then dehumidified to a dew point of no greater than -45°C by means of a dryer (11), then passed through the low-temperature gas duct of the heat exchanger (9) to be heated by means of heat exchange with the gas within the high-temperature gas duct, and then is returned to the heating zone (1) and/or the soaking zone while a portion of the gas headed to the low-temperature gas duct of the heat exchanger (9) from the dryer (11) is returned to a cooling zone (2), by which means it is possible to achieve a reduced dew point of no greater than -45°C in an energy efficient manner.