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BR-112020020476-B1 - FILTER PRESS AND PROCESS FOR FILTER PRESS OPERATION

BR112020020476B1BR 112020020476 B1BR112020020476 B1BR 112020020476B1BR-112020020476-B1

Abstract

FILTER PRESS AND PROCESS FOR FILTER PRESS OPERATION. The present invention relates to a filter press (1), having a set of plates (3), which has several filter plates (2), with filter chambers arranged between the filter plates (2), the filter plates (2) being positioned so as to be movable relative to each other in order to empty the filter chambers if necessary. To obtain greater efficiency, according to the invention, at least one separation device is provided, by means of which a subset (6a, 6b, 6c) of the set of plates (3) can be moved relative to another subset (6a, 6b, 6c) of the set of plates (3), to enable simultaneous emptying of filter chambers and/or simultaneous exchange of filter media in the individual subsets (6a, 6b, 6c). Furthermore, the invention relates to a process for operating a filter press (1) with a set of plates (3), which has several filter plates (2), with filter chambers arranged between the filter plates (2).

Inventors

  • DETLEF GIESEN
  • MICHAEL PANHOLZER

Assignees

  • ANDRITZ TECHNOLOGY AND ASSET MANAGEMENT GMBH

Dates

Publication Date
20260310
Application Date
20190212
Priority Date
20180427

Claims (11)

  1. 1. Filter press (1), comprising a set of plates (3), which has several filter plates (2), with filter chambers arranged between the filter plates (2), the filter plates (2) being positioned so as to be movable relative to each other between a fixed head (7) and a movable pressure plate (8), in order to empty the filter chambers if necessary, characterized in that at least one separation device is provided, by means of which a subset (6a, 6b, 6c) of the plate set (3) can be moved relative to another subset (6a, 6b, 6c) of the plate set (3), to enable simultaneous emptying of filter chambers and/or simultaneous exchange of filter media in the individual subsets (6a, 6b, 6c), and a plate transport chain (12) is provided to move the filter plates (2) along a direction transport (13) oriented from the head (7) to the pressure plate (8), so that the respective individual subassembly (6a, 6b, 6c) is emptyable by the plate transport chain (12), wherein the individual filter plates (2) are moved sequentially away from the head (7), and between the filter plates (2) free spaces (9) are formed, such that the filtrate cake that is in the filter chambers is discharged by gravity, and a drag element (14) is provided, movably connected to the plate transport chain (12), this element can be connected by shape adjustment with the filter plates (2), to connect the plate transport chain (12) in a separable manner with the filter plates (2).
  2. 2. Filter press (1) according to claim 1, characterized in that the separation device is designed as a movable plate (4).
  3. 3. Filter press (1) according to claim 2, characterized in that the movable plate (4) is hydraulically movable.
  4. 4. Filter press (1) according to any one of claims 1 to 3, characterized in that at least two separation devices are provided for dividing the plate assembly (3) into at least three subassemblies (6a, 6b, 6c).
  5. 5. Filter press (1) according to any one of claims 1 to 4, characterized in that several filter chambers of a subset (6a, 6b, 6c) of the plate set (3) can be emptied simultaneously.
  6. 6. Filter press (1) according to any one of claims 1 to 5, characterized in that guide devices are provided, on which at least one separation device and/or the filter plates (2) are movably supported.
  7. 7. Filter press (1) according to any one of claims 1 to 6, characterized in that a filter plate (2), especially a first filter plate (2) of a subassembly (6a, 6b, 6c), has a lifting pad (15), by means of which it is possible to actuate, especially lift, the drag element (14), such that a movement of the subassembly (6a, 6b, 6c), produced with the separation device, in relation to the drag element (14) in the transport direction (13) is not blocked by the drag element (14).
  8. 8. Filter press (1) according to any one of claims 1 to 7, characterized in that at least some filter plates (2) can be joined by adjusting shapes by means of movable latches (16).
  9. 9. Filter press (1) according to claim 8, characterized in that at least one separation device has a special latch (17), such that when the separation device moves in the transport direction (13), the filter plates (2) that are arranged downstream in the transport direction (13) of the separation device are not moved along with the separation device.
  10. 10. Process for operating a filter press (1) with a plate assembly (3), which has several filter plates (2), with filter chambers arranged between the filter plates (2), especially a filter press (1) as defined in any one of claims 1 to 9, characterized in that the plate assembly (3) is divided by a separation device into at least two subassemblies (6a, 6b, 6c), after which at least two filter chambers arranged in different subassemblies (6a, 6b, 6c) are opened simultaneously.
  11. 11. Process according to claim 10, characterized in that several filtering chambers of a subset (6a, 6b, 6c) are opened simultaneously.

Description

[0001] The present invention relates to a filter press, having a set of plates, containing several filter plates, with filter chambers arranged between the filter plates, the filter plates being positioned so that they are movable relative to each other in order to empty the filter chambers if necessary. [0002] Furthermore, the invention relates to a process for operating a filter press with a plate array, which has several filter plates, with filter chambers arranged between the filter plates. [0003] Through the state of the art, pressed filters of the type mentioned at the beginning have become known, as well as processes for their operation, for example, to separate suspensions into solid and liquid components. For this purpose, the set of plates containing the filter plates is usually arranged between a fixed head and a movable pressure plate. Generally, between the individual filter plates there are filtering media such as fabrics, for example cloths, or membranes, by means of which the solid parts of the suspensions are separated from the liquid parts of the suspension. When an operation occurs, pressure is exerted on the set of plates by means of the movable pressure plate, in such a way as to guarantee the sealing of the set of plates, and after that the suspension is introduced into the set of plates, usually through a passage opening centrally located in the set of plates. Under pressure, the suspension is then pumped against the filter medium, causing the solid parts of the suspension to be retained in the filter media, respectively in the filter chambers, where they form a filter cake, while the liquid parts of the suspension pass through the filter medium and exit the filter press through the drainage channels. [0004] To remove the filter cakes from the filtration chambers, the plate assembly is opened, and the filter plates are moved relative to each other in such a way that a distance, or free space, is formed between the filter plates, so that the filter cakes located in the filtration chambers can be discharged from the filtration chambers by the force of gravity. [0005] Usually, a set of plates has a series of filter plates, which are emptied sequentially, as the respective last filter chambers, where a filter cake is still contained, are opened until finally the filter chamber closest to the head is emptied. A duration within which a filter cake is removed from a filter chamber by gravity can be approximately 2.5 seconds, for example. In a typical filter press with 180 filter plates, this leads to a cake discharge time of 450 seconds, such that a corresponding installation is operated for a considerable time in an operational state in which filter cakes are discharged and, consequently, there is no time available for the separation of a suspension. [0006] This is where the present invention comes in. The objective of the invention is to present a filter press of the type mentioned at the beginning, which can be operated in a particularly efficient manner. [0007] Furthermore, the intention is to present a process of the type mentioned at the beginning, which is particularly efficient. [0008] The first objective is achieved according to the invention by means of a filter press of the type mentioned at the beginning, in which at least one separation device is provided, by means of which a subset of the plate assembly can be moved relative to another subset of the plate assembly, to enable simultaneous emptying of the filter chambers in the individual subsets and/or simultaneous exchange of filter media. [0009] Within the scope of the invention, it has been found that efficiency during the emptying of the filter press can be easily multiplied if the individual filter chambers are not emptied sequentially, respectively successively, but rather simultaneously or at least partially. Constructively, this can be implemented in a particularly simple and robust way if a separation device is provided, by means of which it is possible to move one subset relative to another subset. The individual subsets can then be emptied in the traditional way, for example by sequentially emptying the chambers of the individual subsets. It is evident that, depending on the size of the plate set, more separation devices can also be provided to divide the plate set into several subsets. [0010] Preferably, the separation device is designed as a movable plate. In this way, a simple yet robust construction is obtained, with which the subassemblies can be moved away from other subassemblies by means of a pressure force. [0011] It has been proven that the moving plate can be moved hydraulically; for example, one or more hydraulic cylinders can be provided for this purpose, by means of which the moving plate is moved to separate the set of plates into several sub-sets, which will then be emptied simultaneously. [0012] It has been shown that particularly high efficiency is obtained along with a simple filter press design if