VERFAHREN UND TROCKENPARTIE ZUR LUFTZU- UND ABFÜHRUNG IN EINER TROCKENPARTIE

A method and an apparatus for arranging exhaust air and supply air in a drying section covered with a hood (14) in a paper machine, having drying cylinders (10) or the like and devices operating by negative and positive pressure. The exhaust air from the devices operating by negative pressure, such as suction rolls (20) and suction boxes is supplied out from the drying section via a first heat recovery tower (22). Substitute air is supplied via this first heat recovery tower to the runability components (38) operating by positive pressure in the drying section. Substitute air can be additionally supplied via a second separate heat recovery tower (22') to devices (40, 42) supplying heating air and/or ventilation air. The main portion of the exhaust air from the air space of the hood is supplied via this second heat recovery tower and out from the drying section.