Agitating – Having specified feed means – Liquid injector within mixing chamber
Patent
1998-02-26
2000-06-20
Nguyen, Dean T.
Agitating
Having specified feed means
Liquid injector within mixing chamber
3661741, 366244, 162246, 1375651, B01F 506, D21C 706
Patent
active
060769564
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This is the national phase of International Application No. PCT/EP97/02996 filed Jun. 9, 1997.
BACKGROUND OF THE INVENTION
The invention refers to a device for distributing suspensions, particularly pulp suspensions, in a tank, particularly a bleach tower.
In order to prevent the pulp from caking on the walls of a tank, particularly a bleach tower, the suspension must be distributed over the cross-section. A device is known, for example, in which a rotating, horizontal tube is provided to distribute the suspension over the cross-section. This design has the considerable disadvantage that the horizontal tube has to be moved through the suspension in the tank, which demands very high drive power. A further design is known from U.S. Pat. No. 4,621,507, where the suspension is distributed by a rotating cylinder which has web plates or paddles in its inner chamber. The common denominator of the devices of the state of the art mentioned above is that practically the entire quantity of suspension is accelerated, which leads to high energy input, i.e. the distribution elements require high drive power.
SUMMARY OF THE INVENTION
The aim of the invention is thus to create a simple and energy-saving device for distributing the suspension when it is fed into a tank.
According to the invention, this is achieved by providing a disc near the base of the tank with at least one opening so that the suspension is fed to the tank and distributed in cycles over the tank cross-section near its base. Since the suspension is fed into the tank in cycles over the cross-section of the tank base, there is no need to accelerate the suspension, particularly in radial direction.
An advantageous further development of the invention is characterised by a stationary body, in particular a conical body, being provided in the area above the disc, where stationary web plates are provided between the stationary body and the wall of the tank, which form channels with the stationary body and the tank wall. With this arrangement it is particularly easy to divide the flow and distribute the pulp suspension over a larger circumference. This design prevents the pulp from being intermixed and due to the stationary body, particularly a conical body, it is also prevented from settling.
A favourable further development of the invention is characterised by a rotating device, for example paddle blades, being provided underneath the disc to help feed the suspension to the opening. This improves distribution of the suspension on the one hand, and on the other, it prevents the pulp from caking underneath the disc.
A particularly favourable configuration of the invention is characterised by the disc rotating, where a chamber which is connected to the suspension feed pipe can be provided underneath the rotating disc. With this configuration, the energy input for distribution is reduced to a minimum because only one disc has to be rotated and because the suspension is distributed in the tank in a simple way, for example from a distribution area located underneath the disc, and through the opening which is now rotating. If there are also a stationary body and web plates available which form channels, the suspension can be distributed in the tank in a favourable way and without high energy input.
An alternative configuration of the invention is characterised by the disc having several openings which are connected to an annular channel or a feed chamber for the suspension and which can be closed or opened by means of regulating elements, such as butterfly, slide or disk valves, where the regulating elements clear the openings in a particular sequence, especially in a continuous sequence in the sense of rotation. This configuration not only permits a continuous suspension feed in the sense of rotation, but practically any other feed sequence as well, thus providing even better distribution. Even if one of the actuating drives fails, adequate distribution of the suspension is still guaranteed.
An advantageous configuratio
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Scheucher Peter
Schnur Gerald
Sommer Gerhard
Andritz-Patentverwaltungs-Gesselschaft m.b.H.
Nguyen Dean T.
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