DE102014006408A1 - Method and device for pre-separation of a liquid-solid mixture - Google Patents

Abstract

The present invention relates to a method for pre-separating a liquid-solid mixture with the steps of passing the liquid-solid mixture through a mixture chamber (22) from a mixture chamber inlet (34) to a Gemischkammerauslass (38) with partial passage of the liquid of the liquid Solid mixture from the mixture chamber (22) through a filter or sieve element (30) into a liquid chamber (32) having a liquid chamber outlet (44; 46) and adjusting a solid or liquid portion of the liquid present in the region of the mixture chamber outlet (38). Solids mixture by controlling a pressure difference between a mixture chamber side pressure and a liquid chamber side pressure. Moreover, the present invention relates to a device (4) for pre-separation of a liquid-solid mixture.

Description

The present invention relates to a method for pre-separation of a liquid-solid mixture and a device for pre-separation of a liquid-solid mixture.

The prior art discloses methods and apparatus for pre-separating a liquid-solid mixture. In particular, centrifuges, such as screw centrifuges or solid-bowl centrifuges, which are also referred to as decanters, have prevailed. In the known devices, the liquid-solid mixture is introduced into a mixture chamber within which a screw centrifuge rotates at high speeds. Due to the force acting on the liquid-solid mixture centrifugal forces, a partial separation of the liquid from the liquid-solid mixture, wherein the separated liquid is discharged from a first Gemischkammerauslass, while the remaining liquid-solid mixture with a correspondingly lower liquid content by a second Gemischkammerauslass is omitted. In the context of the pre-separation, therefore, there is no complete separation into solid and liquid, but the liquid-solid mixture emerging from the second Gemischkammerauslass is fed to a further device for separating the liquid-solid mixture, wherein it is in the other device usually turn to a centrifuge, so for example, a screw centrifuge, solid bowl screw centrifuge, a decanter or separator acts.

The known methods and devices, such as separators or decanters in the form of worm centrifuges, have basically proven, but are associated with some disadvantages. It should be noted, on the one hand, that during centrifugation of the liquid-solid mixture, very large centrifugal forces act on it, so that the pressure within the mixture chamber is also very high. This is undesirable in natural liquid-solid mixtures, such as fruit or grape mash, since this precludes a gentle, the ingredients protective separation. On the other hand, the known methods and devices disregarded that the liquid-solid mixture supplied via the Gemischkammereinlass is sometimes subject to strong fluctuations in the ratio between liquid content and solids content. Thus, it has been shown, in particular in the case of fruit or grape mash, that the optionally continuously supplied fruit or grape mash has a strongly fluctuating proportion of liquid - and consequently also a strongly fluctuating proportion of solids. Thus, the liquid-solid mixture having a reduced liquid content discharged from the second mixture chamber outlet also has large variations in the ratio between the liquid content and the solid content, which makes further separation difficult in the subsequent apparatus and can result in reduced separation performance. Also, an excessively high proportion of solids can lead to a jamming of the device itself or the subsequent device, and consequently to a malfunction.

It is therefore an object of the present invention to provide a method for pre-separation of a liquid-solid mixture, which allows a gentle pre-separation of the liquid-solid mixture and simplifies further separation of the liquid-solid mixture in the context of subsequent separation operations. The present invention is also based on the object to provide a device for pre-separation of a liquid-solid mixture with the advantages mentioned above.

This object is achieved by the features specified in the patent claims 1 and 9, respectively. Advantageous embodiments of the invention are the subject of the dependent claims.

The inventive method for pre-separation of a liquid-solid mixture has the process steps described in more detail below. Thus, a liquid-solid mixture is passed through a mixture chamber from a mixture chamber inlet to a mixture chamber outlet, partially passing the liquid-solid mixture liquid from the mixture chamber through a filter or sieve element into a liquid chamber having a liquid chamber outlet. In this case, a solid or liquid content of the liquid-solid mixture located in the region of the Gemischkammerauslasses is adjusted by controlling a pressure difference, ie increasing or decreasing the pressure difference, between a mixture chamber side pressure and a liquid chamber side pressure.

Thanks to the filter or sieve element, no large centrifugal forces have to act on the liquid-solid mixture and there is no increased pressure within the mixture chamber, as is the case with the known separators or decanters in the form of centrifugal or solid bowl centrifuges. Rather, a simple separation is possible even at relatively low pressures within the mixture chamber, so that a gentle, the ingredients of the liquid-solid mixture protective separation is ensured. In addition, thanks to the Adjusting the solid or liquid portion of the liquid-solid mixture located in the region of the mixture chamber outlet by controlling the pressure difference between a mixture chamber side pressure and a liquid chamber side pressure ensures that a liquid-solid mixture with reduced liquid content can not be discharged at the mixture chamber outlet but has a predetermined or relatively constant solids or liquid content, so that the separation in a subsequent separation process is greatly simplified, especially by adjusting the solids or liquid content of the befindliches in the Gemischkammerauslasses Flüssigkeits-Feststoff- Mixture at most slight fluctuations in the subsequent separation process occur, which can therefore be disregarded in the context of the subsequent separation process.

In a preferred embodiment of the method according to the invention, the solids or liquid content of the liquid-solid mixture located in the region of the Gemischkammerauslasses is further determined. The control of the pressure difference is carried out as a function of the determined solids or liquid content while achieving a constant solids or liquid content or lying in a predetermined range of solids or liquid content in the range of Gemischkammerauslasses. In other words, in this embodiment, a control with the solids or liquid content of located in the region of the Gemischkammerauslasses liquid-solid mixture is carried out as a controlled variable. If the solids or liquid content of the liquid-solid mixture located in the region of the Gemischkammerauslasses is regulated so that it assumes a constant value or in the predetermined value range, so is the further separation of the discharged from the Gemischkammerauslass liquid-solid mixture with reduced Liquid content in the context of a subsequent separation process simplified, as previously indicated.

In an advantageous embodiment of the method according to the invention, the constant solids content in the region of the Gemischkammerauslasses between 15 wt .-% and 30 wt .-% or the liquid content in the range of Gemischkammerauslasses is between 85 wt .-% and 70 wt .-%. These values have proven to be particularly advantageous with regard to the pre-separation of a liquid-solid mixture in the form of a fruit or grape mash.

In a further preferred embodiment of the method according to the invention, the predetermined range of values in which the solids or liquid content of the liquid-solid mixture located in the region of the Gemischkammerauslasses should be at most 15 percentage points, preferably at most 10 percentage points, more preferably at most 5 percentage points. In the above ranges of values, in particular with regard to a liquid-solid mixture in the form of a fruit or grape mash, a further separation process following the preliminary separation can be carried out effectively and simply with good separation performance. In the value ranges mentioned here, it has also been found to be advantageous if they have a lower limit of 15% by weight solids or an upper limit of 85% by weight liquid content, both a good separation efficiency and a gentle separation in the pre-separation to ensure, with said limits are particularly suitable for liquid-solid mixtures in the form of fruit or grape mash.

As already indicated above, in the method according to the invention a significantly lower pressure can prevail in the mixture chamber than is the case in the case of centrifugal separation. In order to achieve a particularly gentle separation, the mixture chamber side pressure in a further advantageous embodiment of the method according to the invention is at most 4 bar, preferably at most 3 bar, more preferably at most 2.5 bar.

In another preferred embodiment of the method according to the invention, the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure is controlled by controlling the outlet cross section of the mixture chamber outlet and / or the outlet cross section of the liquid chamber outlet. Thus, here, the cross-sectional area of the respective outlet cross section is increased or decreased to vary the volume flow through the respective outlet and thus to control or vary the pressure difference between the mixing chamber side pressure and the liquid chamber side pressure. The control of the respective outlet cross section is relatively easy to carry out and can be done for example by means of a throttle valve.

As an alternative or in addition to the embodiment described above, the pressure difference is controlled in a further advantageous embodiment of the method according to the invention by controlling an optionally upstream mixture supply pump associated with the mixture chamber inlet and / or a mixture removal pump associated with the mixture chamber outlet and optionally downstream. Thus, the capacity of the respective pump is increased or decreased to thereby influence the mixture chamber side pressure and thus the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure. This control is relatively easy to carry out, especially since the respective pump only needs to be controlled accordingly to increase their pump power or reduce.

As an alternative or in addition to the two above-described embodiments, the control of the pressure difference in a further advantageous embodiment of the method according to the invention by controlling a passage cross-section, ie by increasing or decreasing the cross-sectional area of the passage cross-section, a baffle plate disposed within the mixture chamber. In this case, it is preferred if the baffle plate, whose passage cross-section is controlled, is disposed within the mixture chamber with separation of the mixture chamber into a separation chamber assigned to the filter or sieve element and an outlet chamber associated with the mixture chamber outlet.

In a particularly preferred embodiment of the method according to the invention, part of the liquid-solid mixture within the mixture chamber is advanced in the direction of the Gemischkammerauslasses and pushed back a further part of the liquid-solid mixture within the mixture chamber in the direction of the Gemischkammereinlasses. It has been shown that in this way a particularly gentle and effective pre-separation of the liquid-solid mixture can be achieved. In addition, this is a particularly simple process variant, especially since the liquid-solid mixture, if it does not yet have the desired solids or liquid content when reaching the Gemischkammerauslasses, not be led out of the mixture chamber and reintroduced into the mixture chamber inlet at the Gemischkammereinlass got to. Rather, the pushed back in the direction of the Gemischkammereinlasses liquid-solid mixture remains within the mixture chamber, which is desirable for temporal and hygienic reasons.

In a further preferred embodiment of the method according to the invention, the advanced or the pushed back portion of the liquid-solid mixture is displaced along the filter or Siebelements, while the other part of the liquid-solid mixture is preferably displaced from the filter or screen element spaced. The latter has a positive effect on the separation performance in the context of pre-separation.

In a further advantageous embodiment of the method according to the invention, the advancement of the liquid-solid mixture by rotating an arranged in the mixture chamber feed means, optionally a feed screw, and the pushing back of the liquid-solid mixture by rotating a arranged in the mixture chamber retraction means, optionally one back feed screw. The forward and backward pushing by turning the feed and retracting means allows a particularly simple continuous pre-separation.

In a particularly advantageous embodiment of the method according to the invention, the feed means and the return means are rotated in the same direction of rotation and / or at the same speed. This simplifies the control of feed and return means, especially since they can be driven for example via the same motor or easily rotatably connected to each other.

Alternatively or in addition to the above-described method steps for controlling the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure controlling the pressure difference in another preferred embodiment of the method according to the invention by controlling the speed, ie by increasing or decreasing the speed of the feed means or / and retracting means. Although the method becomes more complex as a result, in this embodiment, the rotational speeds of the advancing means and the return means can be increased or decreased independently, for example, in order to influence the pressure difference even faster. In the case described above, in which the feed means and the return means are rotated in the same direction of rotation and / or at the same speed, however, only the rotational speed of the feed or return means to control, especially since feed means and return means in any case in the same direction and / or with be rotated at the same speed.

In order to achieve a gentle pre-separation of the liquid-solid mixture within the mixture chamber in spite of a rotating feed and retracting means, the feed means and / or retracting means with a speed of a maximum of 100 U / min., A maximum of 20 U / min. or a maximum of 10 rpm. turned.

The inventive method for the separation of a liquid-solid mixture has, on the one hand, the method steps for pre-separation in the sense of the type described above and, secondly, the method step of separating the from the Gemischkammerauslass omitted liquid-solid mixture in the context of a subsequent separation process on. As already indicated above, this method has the advantage that in the subsequent process step of separating the liquid-solid mixture discharged from the mixture chamber outlet, the ratio between solids content and liquid fraction in the liquid-solid mixture discharged from the mixture chamber outlet need not be taken into account. Especially as the ratio mentioned was already set in the context of the pre-separation to a meaningful for the subsequent separation measure. In principle, the subsequent process step of separating the liquid-solid mixture discharged from the mixture chamber outlet can be carried out by any separation process. In terms of increased separation efficiency, however, it has proven to be advantageous if the separation of the omitted liquid-solid mixture by centrifugation, preferably by centrifugal slug, of the liquid-solid mixture.

The device according to the invention for pre-separating a liquid-solid mixture comprises a mixture chamber with a mixture chamber inlet and a Gemischkammerauslass, a liquid chamber with a liquid chamber outlet and a filter or sieve between the mixture chamber and the liquid chamber. The said components of the apparatus are arranged such that the liquid-solid mixture is passed through the mixture chamber, partially passing the liquid-solid mixture liquid from the mixture chamber through the filter or sieve element into the liquid chamber from the mixture chamber inlet to the mixture chamber outlet can. In addition, a control device for controlling a pressure difference between a mixture chamber side pressure and a liquid chamber side pressure is provided, by means of which the solids or liquid content of the located in the region of the Gemischkammerauslasses liquid-solid mixture is adjustable. With regard to the advantages of the device according to the invention and the embodiments described in more detail below, reference is made to the aforementioned advantages of the method according to the invention, which apply correspondingly to the device according to the invention and its preferred embodiments.

In a preferred embodiment of the device according to the invention, at least one pressure sensor for detecting the mixture chamber side pressure and at least one pressure sensor for detecting the liquid chamber side pressure are provided. Here, it is preferable that the pressure sensor for detecting the mixture chamber side pressure is assigned to the mixture chamber inlet and / or the mixture chamber outlet to detect the mixture chamber side pressure. Moreover, it is preferable that the pressure sensor for detecting the liquid chamber side pressure is assigned to the liquid chamber outlet.

In a particularly preferred embodiment of the device according to the invention, a device for determining the solids or liquid fraction of the liquid-solid mixture located in the region of the Gemischkammerauslasses is provided. Thus, the device for determining the solids or liquid content, for example, be associated with a sensor, said sensor is preferably associated with the Gemischkammerauslass. Such a sensor is preferably a sensor which is suitable for determining the solids or liquid fraction in a flowing liquid-solid mixture in order to ensure a continuous process, although in principle also a determination based on a stationary one, if appropriate removed, liquid-solid mixture is possible. As sensors, for example, capacitive sensors, optical sensors or ultrasonic sensors are preferred. The device for determining the solids or liquid fraction of the liquid-solid mixture located in the region of the Gemischkammerauslasses cooperates with the control device such that the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure depending on the determined solids or liquid content to achieve predetermined constant solids or liquid content or a lying in a predetermined range solids or liquid content in the region of the Gemischkammerauslasses is controllable. In this embodiment, it can also be said that the control device, in conjunction with the device for determining the solids or liquid content, has a regulating device with the solids or liquid content of the liquid-solid mixture in the region of the mixture chamber outlet as controlled variable.

In an advantageous embodiment of the device according to the invention, an outlet cross section of the mixture chamber outlet and / or an outlet cross section of the liquid chamber outlet can be controlled and reduced by controlling the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure. In this case, it has proven to be advantageous if the control of the respective outlet cross-section takes place through a throttle valve in the region of the respective outlet.

In addition or as an alternative to the above-described embodiment, in another advantageous embodiment the device has an optional upstream mixture supply pump and / or a mixture discharge pump associated with the mixture chamber outlet and optionally downstream of the mixture chamber inlet. In this case, it is preferable if the mixture supply pump and / or the mixture removal pump can be controlled, that is to say their pumping capacity, under control of the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure.

As an alternative or in addition to the two embodiments described above, in a further advantageous embodiment the device has a baffle plate with a passage arranged inside the mixture chamber. In this case, it is preferable if the passage cross section of the passage in the baffle plate is controllable, that is to say variable in size, in order thereby to effect the control of the pressure difference between the pressure on the mixing chamber side and the fluid chamber side pressure.

In a further advantageous embodiment of the device according to the invention, the baffle plate is arranged inside the mixture chamber such that it separates or divides the mixture chamber into a separating chamber assigned to the filter or sieve element and an outlet chamber assigned to the Gemischkammerauslass. In the outlet chamber resulting from this, a rotatable ejector is preferably provided in order to effect a thorough mixing in the outlet chamber as well as a safe expulsion of the liquid-solid mixture via the Gemischkammerauslass. To simplify the structure of the rotatable pusher is preferably with the feed and / or retracting means described later in rotational driving connection.

The baffle plates known from fluid technology are usually displaced within the respective line in the direction of their surface normal to change the size of a passage between the baffle plate and a stationary ring in the conduit. This is sometimes structurally difficult to implement, especially since the baffle plate must be moved translationally. For this reason, the passage cross section of the passage of the baffle plate in a further advantageous embodiment of the device according to the invention while maintaining the distance of the baffle plate to the Gemischkammereinlass or / and -auslass changeable. Alternatively or additionally, the baffle plate is formed by a first disc and at least one second disc which can be rotated relative to the first disc by changing the passage cross-section and which is arranged parallel to the first disc. For example, the baffle plate may be formed by a stationary first disc within the mixing chamber and a second disc rotatable relative to the first disc. The rotational movement is in this case much easier to implement constructively, as is the case with the translational movement of conventional baffle plates.

In a particularly advantageous embodiment of the device according to the invention is in the mixture chamber an advancing means, optionally a feed screw, for advancing a portion of the liquid-solid mixture within the mixture chamber in the direction of Gemischgemischauslasses and a retracting means, optionally a retracting screw, for pushing back another part of Liquid-solid mixture within the mixture chamber in the direction of the Gemischkammereinlasses provided. The feed screw or feed screw described herein may also be referred to as a feed screw or a return screw. In this embodiment it is preferred if the one part of the liquid-solid mixture is displaceable along the filter or sieve element by the advancing or retracting means, while the other part of the liquid-solid mixture is particularly preferably displaced by the advancing or advancing means spaced from the filter or sieve element is displaceable.

In a further preferred embodiment of the device according to the invention, the feed means and the return means are rotatable to achieve the feed and retraction, so for example in the form of the aforementioned feed screw and feed screw formed. In this case, the feed means and the return means are preferably rotatable in the same direction of rotation and / or at the same speed.

In principle, the feed means and the return means can be rotatable independently of each other. In a further preferred embodiment of the device according to the invention, however, the rotational movements of the feed means and the return means are coupled together, so that only one motor for driving or turning is required. In this case, it is preferred if the rotational movements of feed means and return means are coupled in such a way that they are rotatable in the same direction of rotation and / or at the same speed as has already been indicated above. Thus, the retracting means may for example be secured against rotation on the feed means.

In a further preferred embodiment of the device according to the invention is the Speed of the feed means and / or retracting means under control of the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure controllable by the control device, thus changeable.

The arrangement according to the invention for separating a liquid-solid mixture comprises, on the one hand, a pre-separation device according to the preceding description and, on the other hand, a second device for separating the liquid-solid mixture discharged from the mixture chamber outlet of the pre-separation device. The second device, which is not intended to be the same as the aforementioned pre-separation device, may be any device for separating the liquid-solid mixture discharged from the mixture chamber outlet, for example one of the pre-separation device Contraption. However, it is preferred in this context if the second device is a centrifuge, particularly preferably a screw centrifuge or solid bowl screw centrifuge, whose operating principle is based on a separation of the liquid-solid mixture by centrifuging and preferably not by means of a filter or screen element.

In a further preferred embodiment of the method according to the invention or of the device according to the invention, the liquid-solid mixture is or is guided or can be guided along the filter or sieving element while achieving a crossflow filtration. As a result, not only a gentle filtration is achieved, but also the simple implementation of a continuous pre-separation is ensured in the longer maintenance or cleaning pauses largely eliminated.

In a particularly advantageous embodiment of the method according to the invention or the device according to the invention, the pre-separation is or is carried out continuously or can be carried out. Thus, the liquid-solid mixture can in particular be introduced continuously via the mixture chamber inlet or / and be discharged continuously via the Gemischkammerauslass, so that one is not forced to a batch filling with appropriate breaks between the batches.

In principle, any type of liquid-solid mixture may be pre-separated by the method or apparatus of the invention. Due to the particularly gentle separation, the method and the device for pre-separation, however, are particularly suitable for the pre-separation of a liquid-solid mixture in the food. For this reason, the liquid-solid mixture used in a further advantageous embodiment of the method or device according to the invention is a mash, optionally a food mash, preferably a fruit mash, particularly preferably a grape mash.

In the following the invention will be explained in more detail with reference to an exemplary embodiment with reference to the accompanying drawings. Show it:

1 a side view of an arrangement for separating a liquid-solid mixture in a schematic representation,

2 a front view of the feed and return means 1 .

3 a front view of the pusher 1 and

4 a front view of the baffle plate 1 ,

1 shows an arrangement 2 for separating a liquid-solid mixture. The order 2 has a device 4 for pre-separation of the liquid-solid mixture and a second device 6 for further separating the device 4 discharged liquid-solid mixture with reduced liquid content on. The second device 6 , in the 1 is merely schematically indicated, may be any device for the separation of the omitted liquid-solid mixture, but preferably this is a centrifuge, more preferably a screw centrifuge or solid bowl centrifuge, for separating the discharged liquid-solid mixture by centrifuging it , wherein a filter or sieve element, as in the device 4 used and described later in more detail, is optionally omitted.

The device 4 for pre-separation has a container 8th on, which is formed in the illustrated embodiment is substantially cylindrical and its opposite longitudinal directions 10 . 12 whose opposing height directions 14 . 16 and its opposite transverse directions 18 . 20 by means of corresponding arrows in 1 are indicated. Inside the container 8th is a mixture chamber 22 educated. Which are in the longitudinal directions 10 . 12 extending mixture chamber 22 is in a separation chamber 24 and one in the longitudinal direction 12 on the separation chamber 24 following outlet chamber 26 divided. The separation is in this case via a within the mixture chamber 22 disposed baffle plate 28 which essentially takes place in one of the elevation directions 14 . 16 and the transverse directions 18 . 20 spanned plane extends and longitudinally 10 . 12 between the separation chamber 24 and the outlet chamber 26 is arranged. On the construction of the baffle plate 28 will be discussed again later.

In the container 8th is also a filter or sieve element 30 arranged, wherein the filter or sieve element 30 exchangeable or replaceable in the container 8th is attached. The filter or sieve element 30 is formed substantially tubular in the illustrated embodiment. The filter or sieve element 30 surrounds the separation chamber 24 so in the height directions 14 . 16 and the transverse directions 18 . 20 in that the filter or sieve element 30 between the radially inward separation chamber 24 and a radially outward fluid chamber 32 is arranged. Thus, the separation chamber 24 in the radial direction outside of that in the container 8th trained fluid chamber 32 surround.

At the longitudinal direction 10 pointing end of the container 8th is a mixture chamber inlet 34 for introducing the liquid-solid mixture into the separation chamber 24 the mixture chamber 22 intended. Starting from the mixture chamber inlet 34 the container expands 8th , preferably conical, in order to ensure a good and uniform distribution of the introduced liquid-solid mixture in the separation chamber 24 to effect. The mixture chamber inlet 34 is a mixture feed pump 36 assigned, preferably upstream, the pumping of the liquid-solid mixture to be admitted via the Gemischkammereinlass 34 in the separation chamber 24 serves. In addition, the container points 8th one of the mixture chamber 22 , here the outlet chamber 26 , assigned Gemischkammerauslass 38 on. The mixture chamber outlet 38 opens in the illustrated embodiment in the height direction 16 down into the outlet chamber 26 the mixture chamber 22 , wherein the Gemischkammerauslass 38 a mixture removal pump 40 for pumping out of the Gemischkammerauslass 38 associated liquid-solids mixture is assigned to this via a connecting line 42 the second device 6 for further separation.

Also the liquid chamber 32 is at least one liquid chamber outlet for discharging the liquid from the liquid chamber 32 assigned. Thus, a liquid chamber outlet opens 44 in a longitudinal direction 12 rear area of the fluid chamber 32 , here in the height direction 16 down while another fluid chamber outlet 46 in a longitudinal direction 10 front area of the liquid chamber 32 flows, here in the height direction 14 at the top of the container 8th , The two fluid chamber outlets 44 . 46 are in a common line 48 merged through which the liquid separated from the liquid-solid mixture for further processing or use can be supplied.

The outlet section of both the Gemischkammerauslasses 38 as well as the liquid chamber outlets 44 . 46 is controllable and thus changeable, for which purpose in the illustrated embodiment in each case a throttle valve 50 . 52 . 54 in the respective chamber outlet 38 . 44 . 46 is provided. Also are the mixture chamber inlet 34 , the mixture chamber outlet 38 , the liquid chamber outlet 44 and the liquid chamber outlet 46 one pressure sensor each 56 . 58 . 60 . 62 associated with the detection of the pressure in the area of the mixture chamber inlet 34 , the mixed chamber outlet 38 , the liquid chamber outlet 44 or the liquid chamber outlet 46 serves and via a measuring line with a detection device 64 connected is. While the pressure sensors 56 . 58 serve to determine the mixture chamber side pressure, the pressure sensors 60 . 62 the determination of the liquid chamber side pressure serve. The determination device 64 However, not only the determination of the mixture chamber side pressure and the liquid chamber side pressure, but is on the detection device 64 also the solids or liquid content of in the area of the Gemischkammerauslasses 38 located liquid-solid mixture determined. In the illustrated embodiment, this is effected, for example, by causing the mixture chamber outlet 38 a corresponding sensor 66 associated with the determination device 64 interacts.

In the mixture chamber 22 is also a feed means 68 for advancing a portion of the liquid-solid mixture within the mixture chamber 22 , here the separation chamber 24 , longitudinal 12 towards the Gemischkammerauslasses 38 over the outlet chamber 26 intended. In addition, it is a backstroke 70 for pushing back another part of the liquid-solid mixture within the mixture chamber 22 , here in the separation chamber 24 , longitudinal 10 in the direction of the mixture chamber inlet 34 intended. The feed means 68 and the repatriation means 70 are doing so within the separation chamber 24 the mixture chamber 22 arranged that by the advancing means 68 advanced portion of the liquid-solid mixture along the radially inwardly facing side of the filter or Siebelements 30 while the other part of the liquid-solid mixture is displaced by the repulsive means 70 from the filter or sieve element 30 in the radial direction inwards spaced pushed back. The feed means 68 and the repatriation means 70 are around one in the longitudinal directions 10 . 12 extending axis of rotation 72 rotatable to effect the advancement and retraction of the respective portion of the liquid-solid mixture, the advancing means 68 is formed in the illustrated embodiment as a feed screw or helix, while the retracting means 70 is designed as a recoil screw or helix. In this case, the feed means 68 and the repatriation means 70 in the same direction of rotation or / and at the same speed around the axis of rotation 72 rotatable, wherein in the illustrated embodiment, the rotational movements of the feed and return means 68 . 70 coupled together.

As in particular from the 1 and 2 can be seen, the feed and return means 68 . 70 via a common drive shaft 74 driven, extending along the axis of rotation 72 extends. In this case, the drive shaft extends 74 starting from the separation chamber 24 the mixture chamber 22 longitudinal 12 through the baffle plate 28 and through the outlet chamber 26 from the container 8th out to a motor 76 , by means of which the drive shaft 74 around the axis of rotation 72 is rotatable. Although not shown, so the drive shaft 74 inside the container 8th rotatably mounted, so be supported in the radial direction, in which case preferably at least two radial bearings should be provided. The repatriation agent 70 in the form of the return screw is rotationally fixed to the drive shaft 74 attached and winds helically in the circumferential direction around the drive shaft 74 , In the radial outward direction is the feed means 68 non-rotatably on the return means 70 attached. This is how the feed device winds 68 in the form of the feed screw in the circumferential direction like a screw around the return means 70 ,

In the illustrated embodiment, the advancing means 68 but not directly on the return means 70 fastened, the attachment of the feed means 68 at the return means 70 rather takes place via at least one intermediate piece 78 to simplify the manufacture. As in particular from 2 as can be seen, this becomes at least one intermediate piece 78 , of which in the illustrated embodiment preferably at least three, here four, are present, formed as an elongate strut, which in the illustrated embodiment substantially in the longitudinal directions 10 . 12 extends. Thanks to the spacing of the spacers 78 in the circumferential direction to each other a transfer of the pushed back portion of the liquid-solid mixture during operation in the advanced part of the liquid-solid mixture and vice versa is possible. Alternatively, instead of the at least one intermediate piece 78 in the form of the elongate strut also a tubular intermediate piece 78 be provided, wherein in this tubular or tubular intermediate piece preferably transfer openings should be provided to allow the aforementioned transfer of the liquid-solid mixture. In addition, it should be noted that the feed means 68 under formation of an annular gap 80 from the radially inwardly facing side of the filter or Siebelements 30 is spaced, as this particular out 2 evident. This causes wear on the feed means 68 or the filter or sieve element 30 and counteracted too high a mechanical stress of the liquid-solid mixture in this area.

Inside the outlet chamber 26 the mixture chamber 22 is also a rotatable ejector 82 arranged. In the illustrated embodiment, the pusher 82 rotatably with the drive shaft 74 connected so that this around the rotation axis 72 is rotated, the drive also via the engine 76 he follows. The pusher 82 has a rotationally fixed to the drive shaft 74 attached hub 84 on, at least one wing 86 extends in the radial direction to the outside. The at least one wing 86 has at least one radially extending strut 88 - here two each in the longitudinal direction 10 . 12 spaced struts 88 - And in the radial direction of the at least one strut 88 subsequent and essentially longitudinal 10 . 12 extending strut 90 on. The pusher 82 not only ensures a safe expulsion of the liquid-solid mixture from the outlet chamber 26 in the Gemischkammerauslass 38 but also a good mixing of the liquid-solid mixture within the outlet chamber 26 ,

The aforementioned baffle plate 28 points - as in particular 4 apparent - a passage 92 for passing the liquid-solid mixture from the separation chamber 24 in the outlet chamber 26 the mixture chamber 22 on. The passage cross section of the passage 92 is controllable or changeable. That's the baffle plate 28 not designed as a single disc, but rather has the baffle plate 28 a first disc 94 , which is semicircular in the illustrated embodiment, and at least one of changing the passage cross section of the passage 92 relative to the first disc 94 rotatable second disc 96 on. How out 4 can be seen, in the illustrated embodiment, two second slices 96 intended. Both the first disc 94 , which is formed container fixed, as well as the at least one second disc 96 extends in one of the elevation directions 14 . 16 and the transverse directions 18 . 20 spanned level, with the first disc 94 and the at least one second disc 96 are arranged parallel to each other. In the illustrated embodiment, the at least one second disc 96 around the axis of rotation 72 relative to the fixed first disc 94 be twisted to the size of the passage section of the passage 92 to change, as indicated by corresponding arrows in 4 is indicated. For the corresponding actuation of the at least one second disc 96 can be a drive 98 be provided, for example, via an unspecified linkage or gearbox with the at least one second disc 96 cooperates, wherein the at least one second disc 96 in the radial direction on the outside of the container 8th and / or in the radial direction inwards on the drive shaft 74 can be guided, stored or supported. From the foregoing description, it can be seen that the passage section of the passage 92 while maintaining the distance of the baffle plate 28 or the first disc 94 and the at least one second disc 96 the baffle plate 28 longitudinal 10 . 12 to the mixture chamber inlet 34 and the mixture chamber outlet 38 can be controlled or changed.

The device 4 also has a control device 100 on. The control device 100 serves to control a pressure difference between a mixture chamber side pressure and a liquid chamber side pressure, so that the solids or liquid content of the in the region of the Gemischkammerauslasses 38 located liquid-solid mixture is adjustable. So are the mixture feed pump 36 , the mixture removal pump 40 , the throttle valves 50 . 52 . 54 , the motor 76 and the drive 98 by the control device 100 controllable, as evidenced by the in 1 indicated control lines is shown. In this case, the determination device acts 64 such with the controller 100 together, that the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure depending on the determined solid or liquid content to obtain a predetermined constant solid or liquid content or lying in a predetermined range of solid or liquid content in the region of the Gemischkammerauslasses 38 is controllable, as below with reference to the device 4 underlying method will be explained in more detail. In any case, the determining device 64 together with the control device 100 as a control device with the controlled variable of the solids or liquid content of the liquid-solid mixture in the region of the Gemischkammerauslasses 38 be designated.

In the process for pre-separation of the liquid-solid mixture is a liquid-solid mixture, preferably a mash, more preferably a food mash, fruit mash or grape mash, through the mixture feed pump 36 over the Gemischkammereinlass 34 continuously into the separation chamber 24 the mixture chamber 22 supplied and starting from the separation chamber 24 over the outlet chamber 26 to the Gemischkammerauslass 38 then passed through the mixture removal pump 40 through the connection line 42 the second device 6 to be fed. In this case, the liquid-solid mixture within the separation chamber 24 the mixture chamber 22 longitudinal 12 parallel along the filter or sieve element 30 so that due to the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure, a part of the liquid of the liquid-solid mixture from the separation chamber 24 the mixture chamber 22 through the filter or sieve element 30 while retaining the solids in the liquid chamber 32 passes, wherein in the illustrated embodiment, a separation by cross-filtration takes place. Because the liquid-solid mixture on the one hand continuously over the Gemischkammereinlass 34 fed and continuously over the Gemischkammerauslass 38 can be spoken, can also be spoken of a continuous pre-separation. The in the liquid chamber 32 in turn, due to the separation resulting liquid can in turn through the liquid chamber outlets 44 . 46 up to the line 48 be discharged to supply this liquid for further use or processing.

Inside the separation chamber 24 the mixture chamber 22 becomes a part of the liquid-solid mixture in the longitudinal direction 12 towards the Gemischkammerauslasses 38 by turning it in the mixture chamber 22 or the separation chamber 24 arranged feed means 68 while another portion of the liquid-solid mixture simultaneously within the separation chamber 24 the mixture chamber 22 in the direction of the mixture chamber inlet 34 by turning it in the separation chamber 24 arranged return means 70 is pushed back, here nested in the radial direction with the former part or / and parallel to it. As mentioned earlier, feed and return means are used 68 . 70 while in the same direction and at the same speed around the axis of rotation 72 rotated, with the drive over the engine 76 he follows. The one by the feed means 68 the advanced part of the liquid-solid mixture is in the radial direction outside along the radially inwardly facing side of the filter or Siebelements 30 shifted while that of the recoil 70 pushed back portion of the liquid-solid mixture in the radial direction inside of the filter or sieve 30 is moved spaced. For this purpose, the the feed means 68 forming feed screw or spiral and the return means 70 forming feed screw or helix on an opposite orientation.

Thanks to the drive shaft 74 in Drehmitnahmeverbindung standing pusher 82 becomes the liquid-solid mixture in the outlet chamber 26 the mixture chamber 22 mixed to obtain a certain homogeneity of the distribution of liquid content and solid content and safely into the Gemischkammerauslass 38 ejected. It should be noted at this point that the pusher 82 basically also independent of the drive shaft 74 or the feed and return means 68 . 70 and thus can be operated at a different speed, the embodiment shown, however, has proven to be useful in that no additional drive for the pusher 82 is required.

The solids or liquid content of in the area of the Gemischkammerauslasses 38 The liquid-solid mixture is controlled by controlling the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure by the controller 100 set forth, with reference to the underlying scheme to be discussed below.

This continuously over the Gemischkammereinlass 34 supplied liquid-solid mixture may have a highly fluctuating solids or liquid content. With a constant pressure difference between the mixture chamber side pressure and the liquid chamber side pressure, this would mean that also the solids or liquid content of the in the region of the Gemischkammerauslasses 38 liquid-solid mixture already present with already reduced liquid content is subject to strong fluctuations, which is the subsequent separation of the discharged liquid-solid mixture by the second device 6 difficult. Also would then have the solids or liquid content of the area in the Gemischkammerauslasses 38 residing liquid-solid mixture can be readjusted by controlling the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure. Here now automatically takes the from the detection device 64 in connection with the control device 100 formed control device, as will be explained in more detail below.

During the process of pre-separation, the solids or liquid content of the in the region of the Gemischkammerauslasses 38 located liquid-solid mixture, preferably also continuously, by the detection means 64 in conjunction with the sensor 66 determined. Moreover, the mixture chamber side pressure from the detection means 64 with the help of pressure sensors 56 and 58 determined. In addition, the investigator determines 64 the liquid chamber side pressure by means of the pressure sensors 60 . 62 , Because of the pressure sensor 56 determined mixture chamber side pressure of that of the pressure sensor 58 can differ - usually will be larger - can be used for further evaluation, for example, an average of the two determined mixture chamber side pressures for further control or regulation basis. However, it is also possible to base only one of the determined mixture chamber side pressures, in which case also one of the pressure sensors or even one of the liquid chamber outlets 44 . 46 could be waived. The same applies to the pressure sensors 60 . 62 determined liquid chamber side pressures.

Due to the cooperation of detection means 64 and control device 100 the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure is now dependent on the determined solid or liquid content of the mixture in the Gemischkammerauslass 38 liquid-solid mixture to obtain a constant solid or liquid content or lying in a predetermined value range liquid or solid content in the region of the Gemischkammerauslasses 38 by the control device 100 controlled or increased or decreased to the changed solids or liquid content of the over the Gemischkammereinlass 34 taken into account liquid-solid mixture, taking into account the individual possibilities for controlling the pressure difference across the control device 100 will be discussed in more detail later.

The previously mentioned, desired constant solids content in the area of the Gemischkammerauslasses 38 should preferably be between 15% by weight and 30% by weight or the aforementioned constant liquid content in the region of the mixture chamber outlet 38 should preferably be between 85% by weight and 70% by weight. Also, the control device is composed of detection means 64 and control device 100 Preferably designed such that the predetermined range of values in which the solids or liquid content in the region of the Gemischkammerauslasses 38 maximum 15 percentage points, preferably at most 10 percentage points, more preferably at most 5 percentage points, to effectively separate the mixture from the Gemischkammerauslasses 38 discharged liquid-solid mixture with reduced liquid content in the following second device 6 sure. Also, it has been found in this context to be advantageous if said range of values has a lower limit of 15 wt .-% solids or an upper limit of 85 wt .-% liquid content. Also, the control of the pressure difference over the controller 100 preferably carried out such that the mixture chamber side pressure is not more than 4 bar, preferably at most 3 bar, more preferably at most 2.5 bar, in order to achieve a particularly gentle pre-separation of the liquid-solid mixture. In this context, it has proven particularly advantageous if the feed means 68 or / and the repatriation agent 70 is rotated at a maximum speed of 100 U / min, a maximum of 20 U / min or a maximum of 10 U / min to achieve the gentle pre-separation of the liquid-solid mixture. In this respect, the method parameters described above, which are suitable by the control device 100 can be controlled, in particular in methods for pre-separation of a mash, preferably a fruit or grape mash.

As previously indicated, the control of the pressure difference between the mixture chamber side pressure and the liquid chamber side pressure by the controller 100 in cooperation with the investigator 64 done in different ways, with the different options in 1 are shown cumulatively. However, it is understood that only one of the options mentioned can be sufficient, while the other options can be dispensed with.

According to a first option, controlling the pressure difference may be achieved by controlling the outlet cross section of the mixture chamber outlet 38 and / or the outlet cross section of the liquid chamber outlets 44 . 46 by the control device 100 respectively. Increases, for example, the liquid content of the above the Gemischkammereinlass 34 embedded liquid-solid mixture, so also an increased liquid content of in the Gemischkammerauslass 38 located liquid-solid mixture through the sensor 66 the investigator 64 determined. If this liquid fraction deviates from the predetermined constant liquid content or if it no longer lies within the predetermined value range, the control device can 100 the outlet cross section of the liquid chamber outlets 44 . 46 by controlling the throttle valves 52 . 54 increase and / or the outlet cross section of the Gemischkammerauslasses 38 by driving the throttle valve 50 to increase in this way an increase in the pressure difference between the mixing chamber side pressure and liquid chamber side pressure, which results in an increased pre-separation performance and thus a decreasing liquid content in the region of the Gemischkammerauslasses 38 causes. On the other hand, the proportion of liquid in the tank above the mixture chamber inlet drops 34 supplied liquid-solid mixture, so causes the controller 100 an opposite control of said throttle valves 50 . 52 . 54 , Will this regulation again the predetermined constant solids or liquid content of the area in the Gemischkammerauslasses 38 reached liquid-solid mixture reached or at least a solid or liquid content within the predetermined range of values, so the throttle valves 50 . 52 . 54 remain in their position before the above the Gemischkammereinlass 34 admitted liquid-solid mixture in turn varies in terms of its liquid or solid content. The same applies to the additional or alternative options described below.

In another option for controlling the pressure difference between mixing chamber side and liquid chamber side pressure, the mixture supply pump 36 or / and the mixture removal pump 40 by the control device 100 controlled to the solids or liquid content of in the region of the Gemischkammerauslasses 38 to regulate the liquid-solid mixture. Should the liquid content in the over the Gemischkammereinlass 34 For example, if the liquid-solid mixture introduced is greatly increased, then the pressure within the mixture chamber can be increased 22 by increasing the pumping power of the mixture supply pump 36 and / or by reducing the pumping power of the mixture removal pump 40 be increased, which also has an increased pressure difference between the mixing chamber side pressure and the liquid chamber side pressure result.

According to another option, the passage cross section of the passage 92 in the baffle plate 28 via a drive of the drive 98 by the control device 100 and thus a control of the pressure difference can be effected. If the passage cross-section is reduced, the pressure within the separation chamber increases 24 the mixture chamber 22 so that an increased pressure difference between the mixing chamber side pressure and liquid chamber side pressure is achieved. On the other hand, an increase in the passage cross-section leads to a reduction of said pressure difference, which in turn leads to less liquid through the filter or sieve 30 into the liquid chamber 32 arrives.

According to another option, the control of said pressure difference by controlling the speed of the feed means 68 and / or retracting means 70 within the separation chamber 24 the mixture chamber 22 , That's how the engine works 76 via the control device 100 be controlled to the speed of feed and retracting means 68 . 70 to increase, which leads to an increased pressure difference, or decrease, resulting in a reduced pressure difference.

LIST OF REFERENCE NUMBERS

2

arrangement

4

Pre-separation device

6

second device

8th

container

10

longitudinal direction

12

longitudinal direction

14

height direction

16

height direction

18

transversely

20

transversely

22

mixture chamber

24

separation chamber

26

outlet

28

baffle plate

30

Filter or sieve element

32

liquid chamber

34

Mixture chamber inlet

36

Mixture feed pump

38

Gemischkammerauslass

40

Mixture discharge pump

42

connecting line

44

Flüssigkeitskammerauslass

46

Flüssigkeitskammerauslass

48

management

50

throttle valve

52

throttle valve

54

throttle valve

56

pressure sensor

58

pressure sensor

60

pressure sensor

62

pressure sensor

64

determining device

66

sensor

68

advancing means

70

Retracting means

72

axis of rotation

74

drive shaft

76

engine

78

connecting piece

80

annular gap

82

ejector

84

hub

86

wing

88

strut

90

strut

92

passage

94

first disc

96

second disc

98

drive

100

control device

Claims (15)

Process for pre-separating a liquid-solid mixture with the process steps passing the liquid-solid mixture through a mixture chamber ( 22 ) from a mixture chamber inlet ( 34 ) to a Gemischkammerauslass ( 38 ) with the liquid of the liquid-solid mixture partially passing through the mixture chamber ( 22 ) by a filter or sieve element ( 30 ) into a liquid chamber ( 32 ) with a liquid chamber outlet ( 44 ; 46 ) and adjusting a proportion of solids or liquid in the region of the Gemischkammerauslasses ( 38 ) by controlling a pressure difference between a mixture chamber side pressure and a liquid chamber side pressure. Method according to Claim 1 with the further method steps Determination of the solids or liquid fraction in the region of the mixture chamber outlet ( 38 ) and controlling the pressure difference as a function of the determined solids or liquid content to obtain a constant solids or liquid content or lying in a predetermined value range solid or liquid content in the range of Gemischkammerauslasses ( 38 ). Process according to Claim 2, in which the constant solids content in the region of the mixture chamber outlet ( 38 ) between 15% by weight and 30% by weight or the liquid content in the region of the mixture chamber outlet ( 38 ) between 85% by weight and 70% by weight or the predetermined value range comprises a maximum of 15 percentage points, preferably not more than 10 percentage points, more preferably not more than 5 percentage points, and optionally a lower limit of 15% by weight solids or an upper limit of 85 wt .-% liquid content. Method according to one of the preceding claims, in which the mixture chamber-side pressure is not more than 4 bar, preferably not more than 3 bar, more preferably not more than 2.5 bar. Method according to one of the preceding claims, wherein controlling the pressure difference by controlling the outlet cross section of the Gemischkammerauslasses ( 38 ) and / or the outlet cross section of the liquid chamber outlet ( 44 ; 46 ), preferably by means of a throttle valve ( 50 ; 52 . 54 ) by controlling a mixture chamber inlet ( 34 ), optionally upstream, mixture feed pump ( 36 ) and / or one of the Gemischkammerauslass ( 38 ), optionally downstream, Gemischabfuhrpumpe ( 40 ) and / or by controlling a passage cross-section of one within the mixture chamber ( 22 ) arranged baffle plate ( 28 ) takes place, preferably with separation of the mixture chamber ( 22 ) in a filter or sieve element ( 30 ) associated separation chamber ( 24 ) and a Gemischkammerauslass ( 38 ) associated outlet chamber ( 26 ) within the mixture chamber ( 22 ) is arranged. Method according to one of the preceding claims, wherein a part of the liquid-solid mixture within the mixture chamber ( 22 ) in the direction of the Gemischkammerauslasses ( 38 ) and another part of the liquid-solid mixture within the mixture chamber ( 22 ) in the direction of the mixture chamber inlet ( 34 ) is pushed back, wherein preferably the advanced or the pushed back part of the liquid-solid mixture along the filter or Siebelements ( 30 ), while the other part of the liquid-solid mixture is particularly preferably displaced from the filter or sieve element ( 30 ) is moved spaced. The method of claim 6, wherein advancing the liquid-solid mixture by rotating one in the mixture chamber ( 22 ) arranged feed means ( 68 ), optionally a feed screw, and pushing back the liquid-solid mixture by rotating one in the mixture chamber ( 22 ) arranged return means ( 70 ), optionally a recoil screw, wherein the advancing means ( 68 ) and the repatriation agent ( 70 ) are preferably rotated in the same direction of rotation and / or at the same speed and controlling the pressure difference is particularly preferably by controlling the rotational speed of the feed means ( 68 ) and / or retracting means ( 70 ), wherein the feed means ( 68 ) and / or repatriation means ( 70 ) is optionally rotated at a maximum speed of 100 U / min, a maximum of 20 U / min or a maximum of 10 U / min. Process for separating a liquid-solid mixture with the pre-separation process steps according to one of the preceding claims and the subsequent process step of separating the mixture from the mixture chamber outlet ( 38 ) discharged liquid-solid mixture, wherein the separation of the omitted liquid-solid mixture is preferably carried out by centrifugation, particularly preferably by centrifugal slug, of the liquid-solid mixture. Contraption ( 4 ) for pre-separation of a liquid-solid mixture comprising a mixture chamber ( 22 ) with a mixture chamber inlet ( 34 ) and a Gemischkammerauslass ( 38 ), a liquid chamber ( 32 ) with a liquid chamber outlet ( 44 ; 46 ) and a filter or sieve element ( 30 ) between the mixture chamber ( 22 ) and the liquid chamber ( 32 ), wherein the liquid-solid mixture with partial passage of the liquid of the liquid-solid mixture from the mixture chamber ( 22 ) through the filter or sieve element ( 30 ) into the liquid chamber ( 32 ) from the mixture chamber inlet ( 34 ) to the mixture chamber outlet ( 38 ) through the mixture chamber ( 22 ), characterized in that a control device ( 100 ) is provided for controlling a pressure difference between a mixture chamber side pressure and a liquid chamber side pressure, by means of which the solid or liquid content of the in the region of the Gemischkammerauslasses ( 38 ) is adjustable liquid-solid mixture. Contraption ( 4 ) according to claim 9, characterized in that a device ( 64 ) for determining the solids or liquid content of the in the region of the Gemischkammerauslasses ( 38 ) is provided in such a manner with the control device ( 100 ) cooperates, that the pressure difference as a function of the determined solids or liquid content to obtain a predetermined constant solid or liquid content or lying in a predetermined range of solid or liquid content in the range of Gemischkammerauslasses ( 38 ) is controllable. Contraption ( 4 ) according to one of claims 9 or 10, characterized in that an outlet cross-section of the Gemischkammerauslasses ( 38 ) and / or an outlet cross section of the liquid chamber outlet ( 44 ; 46 ), preferably by means of a throttle valve ( 50 ; 52 . 54 ), a the Gemischkammereinlass ( 34 ), optionally upstream, mixture feed pump ( 36 ) and / or one of the Gemischkammerauslass ( 38 ), optionally downstream, Gemischabfuhrpumpe ( 40 ) and / or a passage cross-section of a within the mixture chamber ( 22 ) arranged baffle plate ( 28 ) by the control device ( 100 ) is controllable, wherein the baffle plate ( 28 ) preferably with separation of the mixture chamber ( 22 ) in a filter or sieve element ( 30 ) associated separation chamber ( 24 ) and a Gemischkammerauslass ( 38 ) associated outlet chamber ( 26 ), in which particularly preferably a rotatable ejector ( 82 ), within the mixture chamber ( 22 ) is arranged and / or the Druchlassquerschnitt preferably while maintaining the distance of the baffle plate ( 28 ) to the Mixture chamber inlet ( 34 ) and / or outlet ( 38 ) is changeable and / or the baffle plate ( 28 ) preferably from a first disc ( 94 ) and at least one of changing the passage cross section relative to the first disc ( 94 ) rotatable second disc ( 96 ) formed parallel to the first disc ( 94 ) is arranged. Contraption ( 4 ) according to one of claims 9 to 11, characterized in that in the mixture chamber ( 22 ) an advancing means ( 68 ), optionally a feed screw, for advancing a portion of the liquid-solid mixture within the mixture chamber ( 22 ) in the direction of the Gemischkammerauslasses ( 38 ) and a repatriation agent ( 70 ), optionally a return screw, for pushing back another part of the liquid-solid mixture within the mixture chamber ( 22 ) in the direction of the mixture chamber inlet ( 34 ), wherein the one part of the liquid-solid mixture by the feed or retracting means ( 68 . 70 ) preferably along the filter or sieve element ( 30 ) is displaceable, while the other part of the liquid-solid mixture by the Rückschub- or feed means ( 70 ; 68 ) particularly preferably of the filter or sieve element ( 30 ) is displaceable spaced. Contraption ( 4 ) according to claim 12, characterized in that the feed means ( 68 ) and the repatriation agent ( 70 ) are rotatable to obtain the feed and retraction, wherein the feed means ( 68 ) and the repatriation agent ( 70 ) preferably in the same direction of rotation and / or at the same rotational speed and the rotational movements of the feed means ( 68 ) and retracting means ( 70 ) are preferably coupled together, optionally by a non-rotatable attachment of the return means ( 70 ) on the advancing means ( 68 ), wherein the speed of the feed means ( 68 ) and / or retracting means ( 70 ) particularly preferably under control of the pressure difference by the control device ( 100 ) is controllable. Arrangement ( 2 ) for separating a liquid-solid mixture with a device ( 4 ) for pre-separation according to one of the preceding claims 9 to 13 and a second device ( 6 ) for separating the mixture from the Gemischkammerauslass ( 38 ) discharged liquid-solid mixture, the second device ( 6 ) is preferably a centrifuge, particularly preferably a screw centrifuge or solid bowl screw centrifuge. Method or device ( 4 ) according to one of the preceding claims, characterized in that the liquid-solid mixture, while achieving a cross-flow filtration along the filter or Siebelements ( 30 ) or is feasible or / and that the pre-separation is carried out continuously or is feasible and / or that the liquid-solid mixture is a mash, preferably a fruit mash, particularly preferably a grape mash.

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