Device for lautering wort from a mash

Abstract

A device for lautering wort from a mash (M) in a brewery plant, comprising a lauter tun (2) which has at least one feed opening for the mash and at least one outlet or discharge opening for solid residues, as well as at least one supply line (26) for brewing water and at least one discharge line (27, 32) for lautered wort, wherein the lauter tun (2) has a lower sieve bottom (24) on which solids contained in the mash (M) can settle as a spent grain bed (T) and below which at least one basic discharge line (27) opens into the lauter tun (2) and which forms a basic lautering unit (28), wherein the lauter tun (2) has at least partially a circular horizontal cross-section with a central vertical axis (Z) and is provided with an additional lautering unit (3),which is arranged essentially coaxially to the central vertical axis (Z) and which has a circumferential wall designed at least in part as a sieve wall (37) with sieve openings (37'), wherein the sieve wall (37) separates a mash chamber (M') from a lauter wort collection chamber (38) with which the lauter wort line (39) is in fluid communication, is characterized in that a movable, closed baffle wall (84) is provided, which is movable along the sieve wall (37) such that in an open position it releases the sieve openings (37') of the sieve wall (37) and in a closed position it closes the sieve openings (37').

Description

[0001] The invention relates to a device for lautering wort from a mash according to the preamble of claim 1.

[0002] In the brewing process, a mash is first prepared from crushed cereals and / or malt and water, usually in a mash tun. This mash then undergoes a solid-liquid separation, the so-called lautering process, whereby the resulting liquid phase, known as lauter wort, is transferred to a wort kettle for further processing. During lautering, the mash is thus separated into liquid lauter wort and spent grain.

[0003] This process takes place in a lauter tun, which has an inlet for the mash, an outlet for the solid residues (primarily from the spent grain), a sparge water inlet, and a main outlet for the lautered wort. Inside, the lauter tun is equipped with a lower screen floor, beneath which at least one main outlet enters the lauter tun, forming a basic lautering unit.

[0004] On the sieve plate, the solids settle as a spent grain bed, forming a filter cake through which the wort slowly passes and is discharged via the base outlet pipe. The main flow direction of the wort, which collects above the spent grain bed, is therefore through the spent grain cake and the sieve plate to the wort outlet pipe. Independently of this filtration, the fine suspended solids also settle after a certain time in the wort layer forming above the spent grain bed. The clear wort that forms there through sedimentation, known as first wort, can then be drawn off directly, for example, via hoses or fixed outlets in the side wall of the lauter tun, and fed into further stages of the brewing process without being filtered through the spent grain bed.

[0005] The first wort, with its high extract concentration, results directly from the solid-liquid separation of the mash. This first wort is also known as the main mash. After this first wort is drawn off—either directly or through the spent grain bed—a significant amount of extract remains in the capillaries of the porous spent grain bed. This extract is then extracted with warm water, known as sparge water, to achieve the most efficient extract recovery possible and minimize extract losses in the spent grain. This step is commonly referred to as "sparging." The sparge water becomes enriched with extract from the spent grain bed that is beneficial for the brewing process. This primarily consists of saccharified starch and flavor compounds.

[0006] During lautering, two sub-processes are distinguished: (i) the removal of the first wort and (ii) the subsequent sparging of the spent grain cake with hot water, in which the extract is obtained from the spent grain cake as completely as possible.

[0007] As previously explained, the lautering process involves cake filtration with a compressible filter cake. This means that if the differential pressure is too high, the spent grain cake becomes compressed, significantly reducing its permeability until it becomes completely blocked, resulting in very low or no flow. The solid-liquid separation during the initial wort drawoff is particularly susceptible to unwanted compression, as this is when the liquid phase has its highest viscosity. Furthermore, the sedimentation of the spent grain cake has another detrimental effect on its permeability: the larger, more permeable particles settle first, while the smallest and most impermeable particles settle the most slowly.In the worst case, a poorly permeable top layer forms, consisting of small particles, which acts like a membrane on the more permeable layers below.

[0008] To prevent the formation of static channels in the spent grain bed during filtration of the wort, through which the wort could flow rapidly without significant filtration, the lauter tun is often equipped with a flaking device for the grain bed that forms within the lauter tun. Such a flaking device typically comprises numerous knife-like blades attached to a rotating mechanism located in the upper part of the lauter tun above the mash level. These blades rotate through the spent grain bed, loosening the grain bed, ensuring uniform permeability, and eliminating any flow channels that may form within it. The flaking device allows the differently permeable layers to be mixed by the flaking blades, thus breaking up the membrane-like top layer.However, the introduction of fine particles from the top layer of dough reduces the permeability of the more porous underlying layers of the spent grain cake.

[0009] When dimensioning a lauter tun, certain limits apply to the loading of the sieve plate. With a given sieve plate area, a very high mash loading leads to longer lautering times, which slow down the production cycle accordingly, as a thick bed of spent grain with correspondingly high flow resistance forms. If the loading is too low, the spent grain bed becomes too thin and therefore insufficiently effective, resulting in undesirably high turbidity and poor extract yields. Another factor influencing the design of the lautering process, and thus the dimensioning of the lauter tun, is the viscosity of the brewing liquid above the spent grain bed. Viscosity increases with the extract content, the so-called original gravity, and also with decreasing mash temperature. The first wort has the highest extract concentration and therefore the highest viscosity.This results, particularly with higher original gravity, in a significantly slower lautering rate or a smaller mass flow rate than in the second phase, in which the extract content in the aqueous phase continuously decreases. A further disadvantage is that the mash stored in the lauter tun cools down, especially at slow lautering rates, and thus its viscosity increases considerably, which in turn reduces the lautering rate. For this reason, it makes sense to siphon off the first wort, the so-called first runnings, which forms above the spent grain bed after sedimentation.

[0010] Various methods and devices for this purpose are known from the literature, such as manual suction from above using a hose or in conjunction with a floating device that adjusts to the liquid level and, by means of a guide, prevents the saturate particles from being drawn up from the lower layers. A disadvantage of this is that this manual suction can only be carried out when the aeration device is stationary, and that permanently installing a suction device for the first wort in the lauter tun is structurally complex due to the risk of collision with the rotating aeration device.

[0011] In practice, extraction systems for the first wort are known to use fixed vents in the wall of the lauter tun. A disadvantage of these systems is that ideal and complete extraction of the first wort through these static vents is only partially possible due to the non-constant position of the phase boundary between the spent grain bed and the first wort. This is because if the ratios and quantities of grist and water in the mash are changed, for example, when brewing a beer with a different original gravity, the position of the phase boundary also changes.

[0012] In an internal, unpublished prior art of the applicant, the lauter tun is equipped, in addition to the sieve plate, with at least one supplementary lautering unit comprising a wall formed at least partially as a sieve wall, a lauter wort collection chamber, and at least one supplementary discharge line, wherein the sieve wall of the supplementary lautering unit extends upwards upstream of the sieve plate with respect to the main flow direction. The sieve wall of the supplementary lautering unit extends, for example, at an angle of 90° to the lower sieve plate and penetrates the spent grain bed, reliably reaching into or even beyond the layer of the spent grain, regardless of the current position of the phase boundary between the spent grain bed and the forewort above it.

[0013] This additional lautering device allows the first wort to be drawn off regardless of the amount of mash billet and the original gravity, without the need for hoses or pipes in the upper part of the lauter tun that would obstruct a slurry device. This makes it possible to design the lautering process more quickly and flexibly with regard to the quantity and composition of the mash being processed.

[0014] In this device, at the beginning of the lautering process, first wort is drawn off from the top through the screen wall to accelerate the process. After the first wort has been drawn off, the remaining extract from the spent grain bed is washed out with hot water at approximately 80°C, the so-called sparge water, to obtain a good yield. However, in this sparging stage, the screen wall forms a small local bypass to the spent grain bed, which can slightly reduce the efficiency of the sparge water.

[0015] From DE 10 2019 126 368 A1 a method for obtaining wort in a brewing process by lautering a mash is known, in which the lautering is interrupted when a predetermined permeability of the spent grain cake settled on a false bottom is undershot, whereby wort is then introduced into the spent grain cake in countercurrent flow.

[0016] The DD 262 336 A3 describes a lautering process in which the forming mash column is agitated by mechanical or hydraulic flushing of the filters against the sinking direction of the filter particles or perpendicular or oblique to it.

[0017] EP 0 258 607 A2 shows and describes an additional wort extraction device in lauter tuns, in which at least one hollow body with a sieve wall and open at its underside is provided, which is placed on a sieve bottom of the lauter tun before the mash is introduced into the lauter tun.

[0018] The object of the present invention is to improve such a device for lautering wort in such a way as to achieve more efficient wort extraction during sparging.

[0019] This problem is solved by a device for lautering wort with the features of claim 1.

[0020] A device for lautering wort from a mash in a brewery plant, comprising a lauter tun having at least one inlet opening for the mash and at least one outlet or discharge opening for solid residues, as well as at least one inlet for brewing water and at least one outlet for lautered wort, wherein the lauter tun has a lower screen bottom on which solids contained in the mash can settle as a spent grain bed and below which at least one basic outlet pipe opens into the lauter tun and which forms a basic lautering unit, wherein the lauter tun, which preferably has at least a partially circular horizontal cross-section, has a central vertical axis and is provided with at least one additional lautering unit which is arranged substantially coaxially to the central vertical axis and which has a circumferential wall designed at least partially as a screen wall with screen openings.wherein the sieve wall separates a mash chamber from a lauter wort collection chamber, with which the lauter wort line is in fluid communication, is characterized in that a movable, closed baffle wall is provided which is movable along the sieve wall in such a way that in an open position it releases the sieve openings of the sieve wall and in a closed position it closes the sieve openings.

[0021] The movable baffle plate along the screen wall acts as a cover for the screen openings and thus for the screen surface. When the first wort is drawn off, the baffle plate is in an upper position, exposing the screen wall. During sparging, the baffle plate moves downwards, closing the screen wall. This movable baffle plate allows the screen surface to be closed during sparging, preventing unwanted bypass flow through the screen openings of the auxiliary lauter tun, past the lower screen plate of the main lauter tun, when the baffle plate is closed.

[0022] Further preferred and advantageous features of the device according to the invention for lautering wort are the subject of dependent claims 2 to 10.

[0023] Preferably, the additional purifying device, which is coaxial to the central vertical axis, is cylindrical in design.

[0024] It is advantageous if the aperture wall is designed as part of a downwardly open cylinder, which is arranged radially outside the screen wall and is movable along the radially outer surface of the screen wall.

[0025] In an alternative preferred embodiment of the invention, the aperture wall is also designed as part of a downwardly open cylinder, which, however, is arranged radially within the screen wall and is movable along the radially inner surface of the screen wall.

[0026] Preferably, the aperture wall is designed as part of a cylinder that is open at the bottom and closed at the top.

[0027] In these variants of a downward-opening cylinder, the aperture wall preferably does not have a continuous cylindrical wall along its circumference and / or height, but only the geometric shape of a cylinder and only has partially closed cylindrical wall sections. It is advantageous to provide these closed cylindrical wall sections only where the screen wall is located and needs to be covered.

[0028] The cylinder thus forms a shutter for the sieve wall, which closes or opens the sieve openings of the sieve wall during a vertical movement.

[0029] Another preferred embodiment of the invention, which can be combined with other embodiments, is characterized in that the circumferential wall of the additional lautering device having the sieve wall simultaneously forms a central inner circumferential wall of the lauter tun, wherein an inner lauter wort collection chamber is formed radially within the circumferential wall.

[0030] Alternatively or additionally to the above embodiment, the circumferential wall of the auxiliary lautering device having the sieve wall preferably forms a peripheral inner circumferential wall of the lauter tun, wherein a peripheral lauter wort collection chamber is formed radially outside the circumferential wall.

[0031] It is particularly advantageous if the sieve wall of the additional purification device extends upwards upstream of the sieve base with respect to the main flow direction.

[0032] A particularly preferred implementation of the invention exists when a vertically movable loosening device for a spent grain bed forming in the lauter tun is provided in the upper region of the lauter tun. This device is rotatable about the central vertical axis and has at least one radially outwardly extending arm on which downwardly pointing knife-like blades are arranged. Furthermore, the baffle wall extends downwards from the at least one arm of the loosening device and is vertically movable together with the loosening device. In this way, the adjustable baffle wall forms an adjustable closure baffle, which is actuated and preferably also controlled directly or indirectly by the height adjustment of the loosening machine or by its control mechanism.

[0033] In addition to a direct coupling of the adjustable baffle wall to the loosening machine, an indirect coupling to the loosening machine can also be advantageously provided, for example via a locking mechanism that disengages the baffle wall from its suspension when the loosening machine is lowered, so that it descends and closes the screen wall. Furthermore, a suitable mechanism is advantageous that carries the closing baffle back up from its lowest position and engages it in a holding device in its highest position.

[0034] Another advantageous indirect triggering method for the actuation of the movable baffle wall can be linked to the current height position of the loosening machine and, for example, controlled by a height measurement that lowers the baffle wall when the loosening machine reaches a predetermined height position. The movable baffle wall can have its own lowering and lifting mechanism, which can be actuated mechanically or electrically and is preferably electronically controlled.

[0035] Alternatively, the aperture body may be coupled with a lifting actuation device designed to move the central and / or peripheral aperture body with the aperture wall along the associated screen wall.

[0036] Preferred embodiments of the invention with additional design details and further advantages are described and explained in more detail below with reference to the accompanying drawings.

[0037] It shows: Fig. 1 a schematic vertical sectional drawing of a first embodiment of a device according to the invention for lautering wort from a mash with a raised baffle wall; Fig. 2 the device from Fig. 1 with lowered aperture wall, Fig. 3 a schematic vertical sectional drawing of a second embodiment of a device according to the invention for lautering wort from a mash with a raised baffle wall; Fig. 4 the device from Fig. 3 with lowered baffle wall and Fig. 5 a schematic vertical sectional drawing of a third embodiment of a device according to the invention for lautering wort from a mash with a raised baffle wall.

[0038] In Fig. Figure 1 schematically depicts a device 1 for lautering wort from a mash M in a brewing system. The device comprises a lauter tun 2, which, in a known design, consists of a circular vessel with a flat bottom 20, a circumferential wall 21, and an upper lid 22. The lid 22 rises towards a central vertical axis Z, which terminates in an upward-leading chimney 23 that runs coaxially with the central vertical axis Z. Inside the lauter tun 2, a lower screen 24 is provided as the lower boundary of a mash chamber M'. This screen 24 is essentially flat and parallel to the bottom 20, but vertically spaced from it. The lower screen 24 can also have a conical shape. A lower lauter wort collection chamber 25 is formed between the lower screen 24 and the bottom 20.

[0039] The lauter tun 2 is also equipped with at least one feed opening for mash (not shown) and at least one outlet or discharge opening for solid residues (also not shown). Furthermore, the lauter tun 2 has at least one first inlet 26 for brewing water and a plurality of basic outlet lines 27 for lautered wort, which open into the lauter wort collection chamber 25. The lower screen plate 24, the lower lauter wort collection chamber 25, and the basic outlet lines 27 together form a basic lautering unit 28. The basic outlet lines 27 open into a first lauter wort line 29, which is equipped with a first lauter pump 29' and a first control and shut-off device 29" and which opens into a lauter wort outlet 7.

[0040] The first supply line 26 for brewing water is connected to brewing water distribution lines 26' located inside the lauter tun 2, which in turn are equipped with spray heads 26". This allows brewing water, so-called sparge water, to be introduced into the lauter tun 2 in a uniformly distributed manner across its cross-sectional area and applied from above to the mash supply M contained in the lauter tun 2 or to a spent grain cake T formed from it by liquid removal. In addition, wash water can also be sprayed into the lauter tun 2 via the first supply line 26, the brewing water distribution lines 26', and the spray heads 26" to clean its interior.

[0041] Below the brewing water distribution lines 26', a loosening device 4 is provided in the upper part of the lauter tun 2. This device has a shaft 41 rotatably driven by a motor drive 40, which extends coaxially to the central vertical axis Z and is provided at its upper end 41' with arms 42, 43 extending radially outwards. Two arms are shown in the figures, but there may also be only one arm or more than two arms. Downward-pointing, knife-like blades 44 are arranged on the arms 42, 43, extending almost to the top of the sieve bottom 24.

[0042] A supplementary lautering device 3 is provided centrally in the middle of the lauter tun 2. This device comprises a housing 31 that extends upwards from the bottom 20 of the lauter tun 2 into the interior 2' of the lauter tun 2 as an annular body coaxial with the central vertical axis Z. In this area, the bottom 20 of the lauter tun 2 forms an annular base 30 of the housing 31. At least one internal auxiliary outlet 32 ​​opens into the interior of the annular housing 31 through the annular base 30. The annular housing 31 has a closed inner wall 33 radially on the inside, an outer wall 34 radially on the outside, and a closed lid 35 at the top.

[0043] The outer wall 34 is closed in its lower region 34', with this closed outer wall region 34' extending vertically at least to the lower sieve plate 24. Preferably, however, the closed outer wall region 34' extends upwards beyond the lower sieve plate 24, for example by the height H of the lower lauter wort collection chamber 25, so that the height of the closed outer wall region 34' corresponds to twice the height (2H) of the lower lauter wort collection chamber 25. Above the closed outer wall section 34', the radial outer wall 34 of the annular housing 31 of the auxiliary lautering device 3 is provided with a plurality of sieve holes, so that this upper section 34" of the radial outer wall 34 forms a sieve wall 37 with an annular sieve surface, perpendicular in the example shown, which is arranged around a lauter wort collection chamber 38. The sieve surface can also be realized by slot-shaped openings.

[0044] The lower part of the housing 31, surrounded by the closed outer wall section 34', forms this central wort collection chamber 38, into which one end of at least one internal auxiliary outlet 32 ​​opens. The other end of the auxiliary outlet opens into a second wort line 39, which is equipped with a second lauter pump 39' and a second control and shut-off device 39" and which opens into the wort outlet 7. Wort 30 entering the interior of the annular housing 31 through the screen wall 37 is collected at the bottom of the central wort collection chamber 38 and can flow out through one or more internal auxiliary outlets 32 via the second wort line 39. It is then discharged by the second lauter pump 39' and, if applicable, by the control and shut-off device 39" and fed to subsequent process steps.

[0045] The additional purification unit 3 is also equipped with a fresh water supply line 36, which is connected to an additional spray head 36' located inside the housing 31. Water can be sprayed through this spray head 36' to clean the interior of the additional purification unit 3.

[0046] The device 1 is equipped with a cylindrical aperture body 8, which is suspended coaxially downwards from the arms 42, 43 of the loosening device 4 and is vertically movable together with it. The cylindrical aperture body 8 forms a downwardly open cylinder 80 with a circumferential wall 82, which at least partially forms a vertically movable closed aperture wall 84, serving as a shutter 85 for the sieve openings 37'. The inner diameter of the circumferential wall 82 of the cylindrical aperture body 8 corresponds essentially to the outer diameter of the annular housing 31 of the auxiliary purifier 3, so that when the loosening device 4 is lowered, the aperture body 8 can slide outwards over the radial outer wall 34 of the auxiliary purifier 3, which forms one circumferential wall of the auxiliary purifier 2.The closed aperture wall 84 is movable along the sieve wall 37 such that it is in a position in . Fig. In the opening position shown in 1, the sieve openings 37' of the sieve wall 37 are released and in a Fig. In the closing position shown in Figure 2, the sieve openings 37' are closed. Alternatively, in a modification not shown, the cylindrical aperture body 8 can also be designed such that its closed aperture wall 84 is arranged radially inside the sieve wall 37 and is vertically movable along the radially inner surface of the sieve wall 37.

[0047] An alternative embodiment of the device 1 according to the invention is described in Fig. 3 (open position) and Fig. 4 (closed position) is shown. This embodiment corresponds in its basic structure to the first embodiment, so that in Fig. 3 and Fig. 4 only deviations are shown and provided with reference numerals; otherwise, the reference numerals from apply. Fig. 1 for the structurally identical components. In this second embodiment, the cylindrical baffle body 8 is not attached to a loosening device, but is provided independently inside the lauter tun 2. As in the example of the Fig. 1 and Fig. 2 Here too, the aperture body 8 is designed to cover the sieve openings 37' of the sieve wall 37 in the closed position and to uncover them in the open position. The downwardly open cylinder 80 of the cylindrical aperture body 8 is provided with or connected to an actuating rod 86 arranged coaxially to the central vertical axis Z, which can be actuated by a lifting actuating device 88 such that the downwardly open cylinder 80 is displaceable in the vertical direction. In the example shown, the actuating device 88 and the actuating rod 86 form a linear actuating device for the cylinder 80 and can, for example, be designed as a hydraulic or pneumatic linear actuating device, or they can, for example, be designed as a spindle shaft drive device.However, the invention is not limited to linear actuation devices, but can also, for example, include a lever mechanism or a scissor mechanism for the vertical displacement of the cylinder 80.

[0048] A third embodiment of a device 1' according to the invention for lautering wort is described in Fig. 5 is shown in the open position. The closed position corresponds analogously to those shown in the Fig. 2 and Fig. The 4 shown locking positions of the first and second variants. This third embodiment also corresponds in its basic structure to the first embodiment, so that in Fig. 5 only deviations are shown and provided with reference numerals; otherwise, the reference numerals from apply. Fig. 1 for identical components.

[0049] At this in Fig.In the third variant shown in Figure 5, in addition to the central auxiliary lautering unit 3 with its associated central baffle body 8, which can correspond to the variant according to the first or the second embodiment, a peripheral auxiliary lautering unit 9 with a peripheral baffle body 8' is provided. The peripheral, i.e., the radially outer, circumferential wall 21 of the lauter tun 2 defines an annular peripheral wort collection chamber 90, into which an outer auxiliary outlet line 91 opens, which is fluidly connected to the second wort line 39. The peripheral wort collection chamber 90 is designed, at least in part, as a peripheral screen wall 92 on its radially inner boundary wall 93 – analogous to the centrally provided auxiliary lautering unit 3.The radially inner peripheral boundary wall 93 is closed in its lower region 93', with this closed boundary wall region 93' extending vertically at least to the lower sieve plate 24. Preferably, however, the closed boundary wall region 93' extends upwards beyond the lower sieve plate 24, for example by the height H of the lower lauter wort collection chamber 25, so that the height of the closed boundary wall region 93' corresponds to twice the height (2H) of the lower lauter wort collection chamber 25.Above the closed boundary wall region 93', the radially inner boundary wall 93 of the peripheral annular wort collection chamber 90 is provided with a plurality of sieve openings 92', such that this upper boundary wall region 93" of the radially inner peripheral boundary wall 93 forms the sieve wall 92 with an annular sieve surface, perpendicular in the example shown, which is arranged inside the peripheral annular wort collection chamber 90. The sieve surface can also be realized by slot-shaped openings.

[0050] In addition to the central cylinder 80 of the central aperture body 8 with the closed aperture wall 84, already described in connection with the first and second embodiments, a cylindrical peripheral aperture body 8' is provided, which also has a downwardly open and vertically movable peripheral cylinder 96 with a radially outer circumferential wall 99 forming a peripheral closed aperture wall 98. This circumferential wall 99 is movable along the peripheral screen wall 92 such that, in an open position, it exposes the screen openings 92' of the peripheral screen wall 92, and in a closed position, it closes these screen openings 92'. Although the peripheral cylinder 96 is fundamentally movable in the vertical direction independently of the central cylinder 80, the two cylinders 80 and 96 are preferably coupled to each other so that they can be moved upwards or downwards together and synchronously.

[0051] The invention is not limited to the above embodiment, which merely serves to generally illustrate the core concept of the invention. Within the scope of protection, the device according to the invention can also assume other embodiments than those described above. In particular, the device can have features that represent a combination of the respective individual features of the claims.

[0052] Reference numerals in the claims, description and drawings serve only to improve understanding of the invention and are not intended to limit the scope of protection. Reference symbol list

[0053] It refers to: 1 Device for lautering wort 2 lauter tuns 3 central additional purification devices 4 Relaxation facility 5 separation containers 6. Scraper device 7. Lauter wort discharge 8 central aperture body 8' peripheral aperture body 9 peripheral auxiliary purging devices 20 floor 21 Perimeter wall 22 upper lid wall 23 Fireplace 24 lower sieve tray 25 Lauter wort collection room 26 first supply line 26' Brewing water distribution line 26" spray head 27 Basic drainage line 28 Basic purification unit 29 first lauter wort line 29' first drain pump 29" first control and shut-off device 30 ring-shaped base 31 ring-shaped housing 32 internal auxiliary drain line 33 closed interior wall 34 radial outer wall 34'' lower closed exterior wall area 34" upper exterior wall area 35 closed lid wall 36 second supply line 36' additional spray head 37 sieve wall 37' sieve openings of 37 38 Lauter wort collection room 39 second lauter wort line 39' second drain pump 39" second control and shut-off device 40 Motor drive 41 rotatable driven shaft 41' upper end of the wave 41 42 Arm 43 Arm 44 knife-like blades 50 conical bottom 52 Solid material return line 60 wiper holders 62 wipers 80 downward-facing open cylinder 82 Perimeter wall 84 Panel wall 85 Shutter aperture 86 Actuating rod 88 Hub actuation device 90 peripheral lauter wort collection room 91 external auxiliary drain line 92 peripheral sieve wall 92 sieve openings of 92 93 inner peripheral boundary wall 93' lower closed boundary wall area 93" upper boundary wall area 94 peripheral inner perimeter wall 96 peripheral cylinders 98 peripheral closed aperture wall 99 radial outer circumferential wall A raking water H height M Mash supply M' mash room T Spoil bed / spent grain cake V First wort Z central vertical axis

Claims

[1] Device for lautering wort from a mash (M) in a brewery plant, comprising a lauter tun (2) which has at least one feed opening for the mash and at least one outlet or discharge opening for solid residues, as well as at least one supply line (26) for brewing water and at least one discharge line (27, 32, 91) for lautered wort, wherein the lauter tun (2) has a lower screen floor (24) on which solids contained in the mash (M) can settle as a spent grain bed (T) and below which at least one basic discharge line (27) opens into the lauter tun (2) and which forms a basic lautering unit (28), wherein the lauter tun (2) has a central vertical axis (Z) and is provided with at least one additional lautering unit (3, 9) which is arranged substantially coaxially to the central vertical axis (Z) and which forms a screen wall at least in part (37, 92) has a circumferential wall formed with sieve openings (37', 92'),wherein the sieve wall (37, 92) separates a mash chamber (M') from a lauter wort collection chamber (38, 90) with which the lauter wort line (39) is in fluid communication, characterized by , that a movable, closed baffle wall (84, 98) is provided which is movable along the screen wall (37, 92) such that in an open position it releases the screen openings (37', 92') of the screen wall (37, 92) and in a closed position it closes the screen openings (37', 92'). [2] Device according to claim 1, characterized by , that the additional purifying device (3, 9) which is coaxial to the central vertical axis (Z) is cylindrical in shape. [3] Device according to claim 2, characterized by , that the aperture wall (84, 98) is formed as part of a downwardly open cylinder (80, 96) which is arranged radially outside the sieve wall (37, 92) and is movable along the radially outer surface of the sieve wall (37, 92). [4] Device according to claim 2, characterized by , that the aperture wall (84, 98) is formed as part of a downwardly open cylinder (80, 96) which is arranged radially inside the sieve wall (37, 92) and is movable along the radially inner surface of the sieve wall (37, 92). [5] Device according to claim 3 or 4, characterized by that the aperture wall is designed as part of a cylinder that is closed at the top and open at the bottom. [6] Device according to any one of the preceding claims, characterized by , that the circumferential wall of the additional lautering device (3) having the sieve wall (37) simultaneously forms a central inner circumferential wall of the lauter tun (2), wherein an inner lauter wort collection chamber (38) is formed radially within the circumferential wall. [7] Device according to any one of the preceding claims, characterized by, that the circumferential wall of the additional lautering device (9) having the sieve wall (92) forms a peripheral inner circumferential wall (94) of the lauter tun (2), wherein a peripheral lauter wort collection chamber (90) is formed radially outside this circumferential wall. [8] Device according to any one of the preceding claims, characterized by , that the sieve wall (37, 92) of the cylindrical lautering device (3, 9) extends upwards upstream of the sieve bottom (24) with respect to the main flow direction. [9] Device according to any one of the preceding claims, characterized by, that in the upper area of ​​the lauter tun (2) a vertically movable loosening device (4) is provided for a spent grain bed (T) forming in the lauter tun (2), which is rotatable about the central vertical axis (Z) and which has at least one radially outwardly extending arm (42, 43) on which downwardly pointing knife-like blades (44) are arranged, and that the baffle wall (84, 98) extends downwards from the at least one arm (42, 43) of the loosening device (4) and is vertically movable together with the loosening device (4). [10] Device according to any one of claims 1 to 8, characterized by , that the aperture body (8, 8') is coupled to a lifting actuating device (88) which is designed to move the aperture body (8, 8') with the aperture wall (84, 98) along the associated screen wall (37, 92).

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