JPS6190760A - Device for introducing coherent medium into sludge in inflowchamber for centrifugal separator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention consists of a feed pipe for the flocculating medium, which pipe is guided through the feed pipe for the sludge into an inlet chamber of a centrifuge provided with a flow opening for the sludge. The present invention relates to a device for introducing a flocculating medium into the sludge inside the inlet chamber of a centrifuge as protruding.

From German Patent Application No. 28 22 583, a full-jacket decanter centrifuge is known, in which a flocculating medium is brought into pressure in the inlet chamber of the centrifuge via a fixedly arranged conduit. The conduit is guided through a sludge supply pipe.

The mixing of the sludge and the flocculating medium takes place in this case only by the turbulent flow prevailing in the inlet chamber. A sufficient mixing of the sludge and flocculation medium is not always achieved in this case, however, even when more flocculation medium is applied to the sludge than is necessary for the flocculation of the solid substances present in the sludge. However, metering in more than adequate amounts of flocculating medium and sludge is rather expensive and therefore uneconomical. On the other hand, with this well-known type of feeding a flocculating medium into the sludge, not necessarily all the solid material present in the sludge is obtained by the flocculating medium, which again means that the solids are removed from the liquid in the centrifuge. This is a disadvantage because it acts to separate the two.

The object of the invention is therefore to create a device for introducing a flocculating medium into the sludge inside the inlet chamber of a centrifuge,
The device should be such that it allows optimal mixing of sludge and flocculating medium with as little consumption of flocculating medium as possible.

This object is achieved in the following manner, in that the supply pipe for the agglomerating medium in the supply pipe for the sludge is held movable in the axial direction and/or rotatably.

According to the invention, the agglomerating medium supply pipe is held movable axially and/or rotatably within the sludge supply pipe, so that the agglomerating medium flow emerges from the nozzle-shaped outlet opening of the agglomerating medium supply pipe. It is very advantageous that the flow of sludge in the peripheral area of the inlet chamber can be precisely directed or adjusted, in which flow an optimal mixing of sludge and flocculating medium takes place.

This area, during which practical tests have shown, is located between the reflecting wall of the inlet chamber and the sludge flow opening in the inlet chamber, and where the sludge flow extends in the axial direction. By suitably adjusting the flocculating medium supply pipe according to the invention, it is furthermore possible, as shown in practice, that the application of flocculating medium can be reduced to the respective required minimum amount, thereby reducing the well-known flocculating medium supply. Savings in agglomeration media of up to 50% or more are often achieved compared to devices.

In a further advantageous embodiment of the invention, the feed pipe for the agglomerating medium is made up of several parts, which parts are arranged so as to be slidable or telescopically inserted into one another. By forming the flocculation medium supply pipe in this manner, it is possible to disassemble and reassemble the flocculation medium supply pipe in a simple manner even when the required space is small.

In a further embodiment of the invention, the supply pipe for the agglomerating medium is made of a flexible or elastic material, in particular rubber. Feed pipes for agglomerating media of this kind are distinguished in particular by their ease of handling during assembly and disassembly, and by their self-sealing at the through-openings within the feed pipes for sludge.

The device according to the invention will be explained in more detail below on the basis of an exemplary embodiment shown diagrammatically in the drawing.

As shown in FIG. 1, the centrifuge consists of a centrifuge drum 1 in which a scree conveyor 2 ice is disposed concentrically, the shaft of which is formed as a hollow shaft 3. The outside is surrounded by a group screw 4.

The hollow shaft 8 is closed off by an end wall 5, which is provided with an opening 6 through which a sludge supply pipe 7 fixedly arranged in the central region is guided. A reflection wall 8 with a reflection cone 9 is integrated into the hollow shaft 3 at a distance from the end wall 5, which wall together with the end wall 5 and the hollow shaft 3 forms an inlet chamber 10 for the sludge. ing. In the region of this inlet chamber 10 in the hollow shaft 8, several openings 11 are provided in the centrifuge drum 1, which are evenly distributed over the circumference for passage of the sludge.

Through the feed pipe 7 for the sludge, which leads into the inlet chamber 10, passes a feed pipe 12 for the agglomerating medium, which pipe is provided with a nozzle-shaped outlet opening 13 in the end region.

This agglomerating medium supply pipe 12 is held movably axially and rotatably within the sludge supply pipe 7 according to the invention. A pipe-shaped extension 4 arranged at the outer end of the sludge supply pipe 7 and having a fixing screw 15 serves as a holding device for this purpose. By loosening the adjusting screw 15, the agglomerating medium supply pipe 12 can also be slid in the axial direction and can also be rotated about the axis. In this method, it is very advantageous that the supply pipes 12 for agglomerating medium with nozzle-like outflow openings 13 can be adjusted in each case, so that the agglomerating medium stream 16 leaving under pressure from the nozzle-like outflow openings 13 can be adjusted. It impinges on the rotating sludge layer in the internal peripheral region of the sludge inlet chamber 10 and passes through it at least partially, with internal mixing of the sludge and the flocculating medium taking place.

The area detected in the actual test is located between the reflecting wall 8 and the sludge flow opening 11, and the sludge is located in the peripheral area of the inlet chamber 10. For example, about 0.5 to 10
The amount of flocculation medium that is fed into the inlet chamber 10 to the sludge via the conduit 12 under bar pressure can be optimally adjusted in this way. That is, it can be adjusted to the amount of flocculating medium necessary to trap and flocculate all solid substances present in the sludge. In this way the coalescing medium consumption is quite significantly reduced compared to known devices and the separation effect is substantially improved.

In order to enable the disassembly and assembly of the flocculating medium supply pipe 12 in a simple and space-saving manner, the flocculating medium supply pipe 12 is divided into a number of parts 17, as shown in FIG.
The parts can also be made from one another, but the parts can be inserted into each other or telescoped and slidably arranged.

Further, for example, a supply pipe 12 for agglomerating medium as shown in FIG.
can be made of a flexible or elastic material, in particular rubber, and can also pass through an extension 19 provided in the feed pipe 7 for the sludge by means of a suitable opening 18, in which case the agglomerate under pressure Owing to the elasticity of the medium supply pipe 12, a tight connection and therefore a simple fixing in the opening 18 of the extension is achieved.

Special fixing screw this form and supply pipe for flocculating medium 1
In the case of structural arrangement 2, it is unnecessary.

The subject matter of the invention is not limited only to the embodiments shown in the drawings. Therefore, the coagulating medium supply pipe 12 within the sludge supply pipe 7 may be provided in the middle or on the upper side in the axial direction, or may be installed so as to extend diagonally with respect to these. The supply pipe 12 for the agglomerating medium can still optionally be introduced into its outer inlet chamber 10 . Furthermore, the feed pipe 12 for the agglomerating medium according to the invention can very advantageously also be provided with a plurality of nozzle-shaped outflow openings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional view of a fully jacketed screw conveyor centrifuge with an inlet chamber and a supply pipe for agglomerating medium according to the invention, and FIG. 3 is a partial sectional view of a holding device provided on a sludge supply pipe of a supply pipe sump; FIG. Reference number 7 in the figure: Supply pipe for mm sludge 12... Supply pipe for coagulation medium 13... Nozzle-shaped outflow opening

Claims (4)

[Claims] (1) A centrifuge consisting of a feed pipe for the flocculating medium, which feed pipe is guided through the feed pipe for the sludge and projects into the inflow chamber of the centrifuge provided with a flow opening for the sludge. A device for introducing a flocculating medium into the sludge inside the inlet chamber of a separator, in which the flocculating medium feed pipe (12) is axially movable and/or rotatably movable within the sludge feed pipe (7). A device characterized in that it is held in a (2) The supply pipe (12) for the agglomerating medium is made up of several parts (17), which parts are arranged to be slidable so that they can be inserted into each other or telescoped into each other. Device according to claim 1, characterized in that: 3. Device according to claim 1 or 2, characterized in that the supply pipe (12) for the agglomerating medium is made of a flexible or elastic material, in particular of rubber. (4) The aggregation medium supply pipe (12) is provided with at least one nozzle-shaped outflow opening (13). Device according to paragraph 1.