- Continuous pre-steaming of the raw material
- Can be used as storage bin
- Volume of the bin designed according to plant capacity and required retention time
- Continuous level control by three load cells and a maximum level switch
The temperature differential between the bin and cooking in the vertical digester decreases when chips are heated in a pre-steaming bin.
Any condensate forming in the pre-steaming bin can easily be squeezed out in the plug screw feeder and the chips have only to be heated up from the pre-steaming temperature to the cooking temperature. This drastically reduces condensate in the vertical digester which then does not have to be evaporated in the dryer. As a result, energy consumption in the dryer is considerably reduced.
The ANDRITZ pre-steaming bin is designed as a closed bin made of stainless steel. To ensure easy accessibility, a manhole is located on the top which can only be opened with a special tool.
The ANDRITZ vibrating discharger unit is attached to the pre-steaming bin with springs and a special rubber seal to ensure no loss of steam from the pre-steaming process. The vibrating discharger moves pre-steamed chips continuously out of the bin to maintain a continuous flow to the plug feeder.