ANDRITZ Drum Displacer (DD) Washer
Superior washing, globally preferred and proven
The proven multi-stage washing efficiency in the ANDRITZ DD-Washer is clearly preferred for brownstock, post-oxygen and bleaching washing in mills around the world. With more than 340 installations around the world, the DD-Washer is clearly preferred for all fiberline washing applications – brownstock, post-oxygen and bleaching washing. Key benefits of the DD-Washer are its low operating costs, low emissions, and extremely high washing efficiency in a design that offers a flexible number of displacement washing stages in a single unit.
Efficient washing without mechanical pressing
The ANDRITZ DD-Washer provides superior washing while being extremely gentle to fibers since no mechanical pressing is required for washing. The washer can be flexibly configured with from one to four displacement washing stages in a single unit, which greatly simplifies mill layouts and plant efficiency.
An innovative design which allows the use of fractional filtrates reduces the amount of chemicals required for oxygen delignification and bleaching. With its single motor and no energy utilized for mechanical pressing, the DD-Washer is extremely energy efficient. Countercurrent washing allows reuse of water – lowering consumption and sending less effluent to the treatment plant.
Recent innovations to the pulp and filtrate hydraulics increase throughput: the largest unit today is 6,250 t/d – more than 150 times the capacity of the first DD-Washer when it was introduced in 1983.