Vacuum washer drum
AssigneeAndritz Inc.
InventorTodd Grace
Life of this patent
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Abstract
A vacuum drum washer is designed to enable the use of an end-draining drum for drum lengths exceeding 20 feet. The drum washer includes a cylindrical drum having a mesh screen defining an exterior wall. A plurality of outer filtrate channels are disposed radially inward from the mesh screen. A plurality of inner filtrate channels are disposed radially inward from the outer filtrate channels and extend along generally less than an entire length of the drum. A transfer channel connects the outer filtrate channels and the inner filtrate channels. A plurality of radial drainage chutes are disposed adjacent a head end of the outer and inner filtrate channels, which direct the filtrate to a drain valve.
Claims10
A vacuum drum washer comprising:
- a cylindrical drum including a mesh screen defining an exterior wall;
- a plurality of outer filtrate channels disposed radially inward from the mesh screen, the outer filtrate channels extending along a longitudinal axis of the drum and substantially an entire length of the drum;
- a plurality of inner filtrate channels disposed radially inward from the outer filtrate channels, the inner filtrate channels extending along the longitudinal axis of the drum and less than an entire length of the drum, wherein a transfer channel connects the outer filtrate channels and the inner filtrate channels;
- and
- a plurality of radial drainage chutes disposed adjacent a head end of the outer and inner filtrate channels, the radial drainage chutes directing filtrate to a drain valve.
A vacuum drum washer comprising:
- a cylindrical drum including a mesh screen defining an exterior wall;
- a first plurality of filtrate channels disposed radially inward from the mesh screen;
- a second plurality of filtrate channels disposed radially inward from the first plurality of filtrate channels, wherein a transfer channel connects the first plurality of filtrate channels and the second plurality of filtrate channels;
- and
- a plurality of radial drainage chutes disposed adjacent a head end of the first and second pluralities of filtrate channels, the radial drainage chutes directing filtrate to a drain valve.
A vacuum drum washer comprising:
- a cylindrical drum including a mesh screen defining an exterior wall;
- a plurality of outer filtrate channels disposed radially inward from the mesh screen;
- means for reducing a pressure drop through the outer filtrate channels;
- and
- a plurality of radial drainage chutes disposed adjacent a head end of the outer filtrate channels, the radial drainage chutes directing filtrate to a drain valve.
A method of washing pulp for the manufacture of paper, the method comprising:
- rotating a cylindrical drum having a mesh screen defining an exterior wall in a vat of pulp;
- applying a vacuum within the cylindrical drum until a pulp mat is deposited on the exterior wall;
- applying a washing liquid to the pulp mat on the exterior wall, the washing liquid flowing as filtrate through the pulp mat and through the mesh screen into a plurality of outer filtrate channels disposed radially inward from the mesh screen;
- diverting at least a portion of the filtrate into a plurality of inner filtrate channels disposed radially inward from the outer filtrate channels via a transfer channel connecting the outer filtrate channels and the inner filtrate channels;
- and
- directing the filtrate to a drain valve via a plurality of radial drainage chutes disposed adjacent a head end of the outer and inner filtrate channels.
Dependencies are inferred from the claim text.