Liquid purification or separation – Filter – Movable medium
Patent
1987-11-13
1989-02-28
Schor, Kenneth M.
Liquid purification or separation
Filter
Movable medium
68181R, 162 60, 210406, 2104161, D21C 906
Patent
active
048083100
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates generally to an apparatus for the liquid treatment of pulp, and more specifically to a liquid treatment system where vapour and liquid are discharged separately.
This invention relates to an apparatus for the liquid treatment of pulp, comprising a stand with two end rolls, over which an endless liquid permeable web runs. The web consists of a wire or perforated belt, for example steel belt. The web is driven by one of the end rolls and slides over perforated covers on containers located therebeneath. A head box for the supply of pulp is located at one end of the web, and means for the transfer of the treated pulp are located at the other end of the web. Means for supplying treatment liquid to the pulp are located above the web. The containers located beneath are intended for the collection of liquid.
The said containers extend in cross-direction along the entire width of the web and are arranged one after the other in the running direction of the web. The width of the web, and therewith also of the containers, can be up to 6 m. In certain cases webs of still greater width are used. The containers may also be sections of a greater trough.
At the liquid treatment liquid in the pulp is driven out by supplied treatment liquid. The liquid driven out together with vapours and gases are collected in the containers.
It is desired to discharge vapours and liquid from the containers separately. This, however, involves difficulties, due to the extension of the containers in the cross-direction of the web and to the restricted space in the containers, which implies that the flow rate of the vapours is high and foam formation easily arises.
The present invention has the object to solve this problem. According to the invention, a very compact structural design in combination with low vapour rate and reduced risk of foam formation in the containers is obtained. The characterizing features of the invention are apparent from the attached claims.
BRIEF DESCRIPTION OF THE DRAWING
The invention is described in greater detail in the following, with reference to the accompanying Figures showing a preferred embodiment of the invention.
FIG. 1 shows a liquid treatment system according to the invention.
FIG. 2 shows a portion of a cross-section along II--II in FIG. 1.
FIG. 3 is a section along III--III in FIG. 2.
FIG. 4 shows a second embodiment in a section along II--II in FIG. 1.
DESCRIPTION OF THE INVENTION
The embodiments shown comprise an endless perforated steel belt 1, which runs about a first and a second end roll 2 and, respectively, 3. The rolls are arranged in a stand 4. The first roll 2 is movable by means of a stretching device, preferably hydraulic, for adjusting the belt tension. The belt is driven via the second roll 3, and both rolls are preferably coated with a friction increasing surface layer.
At the first roll 2 a head box 6 is located for distributing the cellulose pulp to a uniform layer on the belt 1. After the head box 6 a plurality of containers 8 are arranged one after the other in the longitudinal direction of the belt. The containers 8 are provided with perforated covers as a support for the belt 1. Outlets 9 and, respectively, 10 are connected to the containers 8 for the removal of liquid and, respectively, vapours and gases. The liquid outlet is located in the bottom of the containers 8 to ensure effective drainage. The liquid level in the containers is controlled by special means so that a small space for vapours and gases is maintained in the upper portion. The fall of the liquid from the belt 1 down into the containers thereby is small and reduces the foaming tendency.
The outlet 10 for vapours and gases also is located in the bottom of the containers 8, preferably centrally beneath the containers in the cross-direction of the belt. The structural design, however, renders their location possible anywhere in the cross-direction of the containers.
The outlet communicates with the space for vapours and gases in the containers 8 through an inte
REFERENCES:
patent: 2237635 (1941-04-01), Saxe
patent: 4154644 (1979-05-01), Ericsson
patent: 4161395 (1979-07-01), Brown et al.
patent: 4569762 (1986-02-01), Gaudrin
patent: 4657637 (1987-04-01), Lindstrom
Hastings K. M.
Schor Kenneth M.
Sunds Defibrator Aktiebolag
LandOfFree
Apparatus for liquid treatment of pulp with vapor separation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for liquid treatment of pulp with vapor separation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for liquid treatment of pulp with vapor separation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1364766