Krauss-maffei Aktiengesellschaft

Peter Ostermeyer

Gunther Hultsch

Kurt Zeppenfeld

Peter Niedner

Eugen Fink

Manfred Scherer

Richard Widmann

A pneumatic discharge apparatus for a stripping centrifuge that has a stripping blade mounted on the stripper head and extending over the entire width of the drum. A filler body is further arranged in the stripper head, which affects the conveying flow through the stripper head so that the material being stripped is prevented from settling in a critical material settling area. Because the stripping blade extends over the entire width of the drum and the filler body is arranged in the stripper head, the discharge capacity of the pneumatic discharge apparatus is very high, and the sealing problems usually arising in vertical stripper centrifuges are largely eliminated.

Pneumatic discharge apparatus for a stripping centrifuge

A pocket-type centrifuge for processing sugar-beet or cane-sugar mash has a rotor which carries an annular array of pockets whose inner portions are formed as sieves and whose outer portions are constructed to mix a wash liquid with the mash that is fed axially into the rotor and that passes radially out over the pockets. A primary filtrate can be extracted from behind the sieves of the inner portions of the pockets, and the remainder of the mash mixture is then mixed with a wash liquid fed into an annular inwardly open chamber above the rotor that feeds its liquid into the outer portions of the pockets. From the pockets the mixed wash liquid and mash is projected onto a downwardly flared skirt of the rotor, and from this skirt onto an upwardly flared outer drum that is rotated slower than the rotor. The lower portion of this drum is solid and imperforate to insure good mixing of the wash liquid and the remaining solid phase, and its upper portion is foraminous so that as the material migrates axially upwardly all of the remaining liquid is extracted from it, along with any soluble substances in the mixture. In this manner most of the liquid phase in the original mixture is extracted, undiluted, at the inner regions of the pockets, and the remaining soluble substances are leached out by the wash liquid. The solids recovered at the upper end of the outer drum are almost completely dry and free of soluble substances.

Pocket-type sieve centrifuge

Clarifier sludge is dewatered to a relatively low residual moisture content by passing it axially in one direction through an inner centrifuge drum in which initial dewatering takes place in a first centrifugal force field. Immediately thereafter the solids phase is introduced into an outer second drum having a diameter approximately twice that of the first and in which the solids are subjected to a centrifugal force field about twice as great as the first force field. In each drum the solids are displaced by wipers or scrapers (strippers) preferably of the worm type and the liquid is drawn from the drum at the opposite axial end from that at which the solids are removed.

Apparatus for the dewatering of sludge

A method of operating a filter centrifuge or centrifugal filter in which a hydrostatic head is provided at the filtering surface so as to control liquid passage therethrough. The head may promote movement of the liquid through the filter layer or may induce reverse flow of liquid for backwashing or rinsing. In addition, a hydrostatic balance may be provided at this surface through control of the head to limit passage of the liquid through the filter layer. Preferably the head provides a suction augmenting centrifugal filtration.

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Munich, Germany

Peter Ostermeyer