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US 10,329,176 B2Granted
Method and device for dewatering sludge on a screen
AssigneeAndritz Inc.
InventorsUrsula Hochegger, Christoph Spielmann
Life of this patent
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AssigneeAndritz Inc.
InventorsUrsula Hochegger, Christoph Spielmann
Estimating the term…
The invention relates to a method for the dewatering of sludge on a screen, wherein a flocculant is admixed with sludge, whereafter the sludge is at least partially dewatered, the flow behavior of the sludge on the screen being optically detected and the amount of flocculant to be admixed being set according to the free screen surface in a control region. The invention is primarily characterized in that the control region is arranged at a point of the cleaned screen in the inlet area of the sludge, for example at the edge. The invention also relates to a device for the dewatering of sludge, comprising a flocculant feed device and a screen downstream of the flocculant feed device, wherein a device, in particular a camera, is provided for optically detecting the flow behavior of the sludge and is connected via a control system to the flocculant feed device for regulating the amount of flocculant, said device being characterized in that the device (11), in particular the camera, is designed such that it detects a control region in the inlet area (10) of the cleaned screen. In this way, regulation can be achieved for an optimal feed amount of flocculant in a straightforward manner regardless of the material feed and the sludge type.
Method for dewatering sludge that passes through a machine feed region to a headbox and is then deposited at an inflow region of the machine onto a clean wire that has been cleaned by washing upstream of the inflow region, thereby producing a distribution of sludge-covered and at least one free surface area without sludge on the wire in the inflow region, with the method further including adding a dosage of flocculant to the sludge before the sludge is deposited on said wire, and wherein the rheological properties of the sludge on the wire are scanned optically and the amount of flocculant to be added is set according to the free surface area of the wire in a control zone, wherein the improvement comprises that the control zone is established on the wire in the inflow region that follows washing of the wire, and
Device for dewatering sludge, including a flocculant feed device and a wire arranged after the flocculant feed device, washing nozzles (9) for cleaning the wire upstream of a dewatering inflow region (10) where sludge is deposited on the cleaned wire from a headbox (5), a camera (11) provided to scan the rheological properties of the sludge optically and a control system (13) connected to the camera and to the flocculant feed device (7) to control a flocculant dosage, wherein the improvement compromises that the camera is set up to scan a control zone of the cleaned wire in the dewatering inflow region (10) that follows the washing nozzles (9) that clean the wire, and
Dependencies are inferred from the claim text.