DE29700467U1 - Filtration device for dewatering solid / liquid mixtures - Google Patents

Description

Filtration device
for dewatering solid/liquid mixtures

Description

The invention relates to a filtration device for

■ ■ -

Dewatering of solid/liquid mixtures, which has a pressure vessel to which a stream of compressed air is continuously fed in order to build up and maintain an internal pressure above atmospheric pressure, whereby the separation of the solid particles of the solid/liquid mixture from the liquid takes place with the aid of a filter medium located in a filter device, for example a filter cloth, and whereby the separated solid is finally fed to a solid lock, while the filtrate is led out of the pressure vessel together with the process air via a common or separate line and the air/liquid mixture is separated outside the pressure vessel. The filter device can be designed as a pressure disk filter, pressure drum filter, pressure belt filter or the like. A pressure disk filter is expediently used because it allows very large filter surfaces to be realized on a small base area and the filter surfaces are the cheapest in terms of specific costs. It is also possible to break it down into small units for transport.

In known filtration devices of the aforementioned type, as described for example in DE 29 47 329 C2, a filter device is located in a pressure vessel. If the capacity of such a filtration device is not sufficient, two or more filtration devices are used, which

o .35 each consisting of a pressure vessel with a

For each filtration device, a separate supply line for the solid-liquid mixture, a solids lock and a compressed air supply are provided. Some filtration devices also have a conveyor for transporting the solids removed from the filter media of the filter device to the solids lock. This design of the known filtration devices results in a considerable expenditure on technical resources, including control and regulation expenditure, as well as a relatively high space requirement.

The invention is based on the object of designing a filtration device in such a way that the filtration of considerable quantities of a solid-liquid mixture can be carried out with little technical effort and with little space requirement.

The solution to the problem in a filtration device of the type mentioned above is

- that at least two filter apparatus are provided in the single pressure vessel

- and that for the removal of the filter media

the solids removed by the filter apparatus from the overpressure area prevailing in the pressure vessel into the atmospheric area, a solids lock is installed on the underside of the pressure vessel.

However, in a number of applications, only one conveyor and one solids lock are sufficient. The lock function is achieved by using a double slide system, a double pendulum flap system or a cell wheel system.

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The removal of solids from the filter media of the filter devices can be achieved by compressed air recoil.

The inventive design of the filtration device enables a modular structure and therefore leads to significant cost advantages. Further cost advantages result from the fact that all filter devices and most additional and secondary devices, such as the compressed air supply, hydraulic station and the inlets and outlets, are significantly simplified and are present in smaller numbers. A very significant advantage results from the fact that all filter devices are housed in a common pressure vessel, which leads to a specifically minimal space requirement.

In the design of the filtration device according to the invention, at least two conveyors are provided in the pressure vessel for conveying the solids to the solids lock. This has the advantage that the filtration device can continue to operate at half capacity if one conveyor fails.

In a further embodiment of the filtration device according to the invention, the pressure vessel is provided with at least two solids locks. The individual solids locks have a smaller cross-section and a smaller height than in the case of only one solids lock. In addition, the filtration device can continue to operate at half capacity if one solids lock fails. Furthermore, in this case no conveyor is required to transport the solids removed from the filter devices to the solids locks.

The invention is explained in more detail with reference to the drawing, in which three embodiments of the filtration device according to the invention are shown schematically in longitudinal section.

The filtration device 1 shown in Fig. 1 consists essentially of a pressure vessel 2 in which two filter devices 3.1 and 3.2 are provided. Compressed air is continuously supplied to the pressure vessel 2 via a compressed air line 4. Compressed air is also fed through a storage container 5 via a branched line 4', which is then passed through the filter medium (not shown in detail), for example a filter cloth, via further lines 6.1 and 6.2 and control heads 7.1 and 7.2 in order to clean the filter medium. In the lower area of the pressure vessel 2 in the embodiment shown there is a conveyor 8 which feeds the solids removed from the filter media of the filter devices 3.1 and 3.2 to a solids lock 9. The solids lock 9 is controlled by a hydraulic station 10. The solid/liquid mixture is fed from a container 12 into the pressure vessel 2 via a feed line 11. A

, standing pipeline 14. The filtrate exiting via the control heads 7.1 and 7.2 is fed via lines 15 to a filtrate separator 16; there the air/liquid mixture forming the filtrate is separated.

In the filtration device 1 shown in Fig. 2, two conveyors 8.1 and 8.2 are provided in the pressure vessel 2, which convey the liquid from the filter media of the filter

units 3.1 and 3.2 feed the solids removed to a solids lock 9, while the filtration device shown in Fig. 3 has two solids locks 9.1 and 9.2 and therefore no conveyor is required.

Three or more filter devices can also be arranged in a pressure vessel, with the appropriate number of conveyors and/or solids locks.

Claims (3)

Protection claims 1. Filtration device for dewatering solid/liquid mixtures in a pressure vessel to which a stream of compressed air is continuously supplied in order to build up and maintain an internal pressure above atmospheric pressure, wherein the separation of the solid particles of the solid/liquid mixture from the liquid takes place with the aid of a filter medium located in a filter apparatus, for example a filter cloth, and wherein the separated solid is finally fed to a solid lock, while the filtrate is led out of the pressure vessel together with the process air via a common or separate line and the air/liquid mixture is separated outside the pressure vessel,
characterized, 1.1 that at least two filter devices (3.1, 3.2) are provided in the single pressure vessel (2) 1*2 and that a solids lock (9) is fitted on the underside of the pressure vessel (2) for removing the solids removed by the filter media of the filter apparatus (3.1, 3.2) from the overpressure area prevailing in the pressure vessel (2) into the atmospheric area. 2. Filtration device according to claim 1, characterized in that at least two conveyors (8.1, 8.2) for conveying the solids to the solids lock (9) are provided in the pressure vessel (2). 3. Filtration device according to claim 1 or 2, characterized in that the pressure vessel (2) is provided with at least two solids locks (9.1, 9.2).