AN ARRANGEMENT AND A METHOD FOR DRYING A TISSUE PAPER WEB WHEREIN WASTE HEAT IS UTILIZED

摘要

The invention relates to an arrangement (1) for drying a web W of tissue paper. The arrangement (1) comprising a Yankee drying cylinder (3) which is connected to a source (4) of hot steam so that hot steam can be supplied to the interior part (5) of the Yankee drying cylinder (3) and a hot air hood (6) at the outer circumference (7) of the Yankee drying cylinder (3). The hot air hood (6) is arranged to let hot air flow against the outer circumference (7) of the Yankee drying cylinder (3). A waste air conduit (8) is connected to the hot air hood (6) and arranged to conduct waste air out of the hot air hood (6). An energy transfer device (9) is arranged to transfer heat from hot air in the waste air conduit (8) to water such that the water evaporates into steam. The arrangement (1) further comprises a suction roll (10) which is arranged either such that it forms a nip N with the Yankee drying cylinder (3) or arranged upstream of the Yankee drying cylinder (3) such that a wet tissue paper web W which is on its way to the Yankee drying cylinder (3) passes the suction roll (10) before it reaches the Yankee drying cylinder (3). A steam box (11) is arranged opposite the suction roll (10) such that steam from the steam box (11) can be applied to a tissue paper web W that passes the suction roll (10). The arrangement (1) also comprises a conduit (12) from the energy transfer device (9) to the steam box (11) such that steam that has been generated in the energy transfer device (9) can be fed from the energy transfer device (9) to the steam box (11). The invention also relates to a method making use of the inventive arrangement.