Control and / or regulation of a process air system

摘要

Method for controlling and / or regulating a process air system of a dryer hood of a machine for the production of a fibrous web, in particular a paper, cardboard or tissue web, in which a wet part and a dry part of the Drying hoods are supplied with hot air via a respective air circuit and each air circuit is supplied with air via a respective air supply control element of a duct system and humid exhaust air is discharged via a respective exhaust air control element, and the moist air from the wet section and the dry section are discharged as common exhaust air via a common discharge line, characterized that a mass balance of the incoming and outgoing air is created, and the same amount of dry air that is discharged via the common discharge is fed back into the air circuits. Likewise a suitable machine.