ARRANGEMENT AND METHOD FOR A PULP DRYER

The invention relates to an arrangement and a method for a pulp dryer, which comprises an entrance opening for a pulp web in a first end of the dryer and an exit opening in the second end of the dryer. The dryer further comprises a number of horizontal superposed drying decks, whereby each drying deck comprises a number of drying groups, which comprise drying means for drying and supporting a pulp web to be dried, fan towers comprising a number of superposed fans, which are arranged to supply heated air to the drying groups, as well as roll towers in the first and second ends of the pulp dryer, which comprise several superposed parallel turn rolls for turning the pulp web to from one drying deck to the succeeding drying deck. The arrangement comprises at least one pressure sensor, which is arranged in a fixed position in connection with one of the drying means, optionally at least one temperature sensor, which is arranged in a fixed position in connection with one of the fans supplying air to the drying means, and a control unit, which is arranged in functional contact with the said sensor(s) and to receive measurement values from the sensor(s). The control unit comprises means for calculating an instantaneous blow velocity value based on the measurement values.