Method for controlling and optimizing the operation of a perforated belt press for filtering slurry
AssigneeVon Roll AG
InventorFrancois Kistler
Life of this patent
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Abstract
A level measuring sensor is arranged at the start of the straining zone in the perforated belt press and this in particular measures the level change and then regulates the flocculant inflow. In order that the level in the straining zone is stabilized, the perforated belt press must operate in the overflocculation zone. If the flocculant inflow is reduced to the technically possible operating limit, the dry substance content of the filter cake has an optimum value. Thus, the optimization of the control of the operation of the perforated belt press can be reduced to a relatively simple measurement of a level or the time changed thereto.
Claims8
A method for controlling the operation of a perforated belt press for filtering a slurry which comprises:
- providing two superimposed perforated belts with the lower perforated belt forming a straining zone and the two perforated belts together forming a pressing zone to form a filter cake having a dry substance content, wherein the pressing zone is downstream of the straining zone;
- providing regulatable parameters comprising the drive of the perforated belts, the inflow of slurry, the flocculant addition, the belt tension and the belt nip pressure;
- wherein in order to optimize the dry substance content of the filter cake and the flocculant inflow, the flocculant quantity in an overflocculation zone is only reduced to the extent that the slurry level at the start of the straining zone is still stabilized, wherein the dry substance content of the filter cake and the flocculant inflow is optimized by a level measurement at the start of the straining zone and wherein the time change of the level is measured, and wherein for optimizing the operation of the perforated belt press, the optimization of the flocculant inflow through the flocculant circuit is combined with the optimization of at least one of the quantities:
- perforated belt speed, perforated belt tension and perforated belt nip pressure.
Dependencies are inferred from the claim text.