EP4205839A1 - Device for gassing liquids - Google Patents

Abstract

The invention relates to a device for gassing liquids, which has at least one linear gassing device (30) for introducing gas into a liquid. The linear gasifier (30) has at least one tube (1) with at least one entry opening (4). In addition, the device has a fixing plate (31) with a flat top (35) and with at least one groove (50, 51, 52, 53) which is embedded in the top (35) of the plate (31) and into which at least one section of the linear gasifier (30) is accommodated and fixed.

Description

The invention relates to a device for gassing liquids.

It is generally known that gases, which also include gas mixtures, can be supplied to a liquid in two different variants. A distinction is made between gassing into the liquid via the liquid surface by diffusion and gassing in the liquid below the liquid surface by pressure, with different concepts being able to be implemented when entering with pressure.

In the case of entry systems for gassing below the liquid surface, linear gassing devices are used in particular. The linear gasifiers are typically attached to the bottom of a tank or reactor and are used to introduce pressurized gas into the liquid via orifices. Linear gasifiers are used, for example, to introduce oxygen into lakes and ponds, or to treat waste water by introducing air or ozone, or as an oil barrier.

A linear gasifier is typically made of one or more tubes in which a large number of entry openings are embedded. A gas is fed into the interior of the tube in order to then feed it into the liquid via the entry openings. A disadvantage of conventional linear gassing systems is that the linear gassing Can move a result of attacking forces, such as flow forces or buoyancy forces in their position.

The object of the invention is to provide a device for gassing liquids with a defined position of the linear gassing device.

This object is achieved by a device for gassing liquids with the features of claim 1. Developments of the invention are specified in the dependent claims.

Accordingly, the invention considers a device for gassing liquids, which has at least one linear gassing device for introducing gas into a liquid, wherein the linear gassing device has at least one pipe with at least one entry opening and preferably with a large number of entry openings. The device also has a fixing plate with an upper side in which at least one groove is embedded. Provision is made for at least one section of the linear gasifier to be accommodated and fixed in the groove.

The invention is based on the idea of accommodating the linear gasser at least in sections in the groove of a fixing plate and fixing it in the groove at least in sections. In comparison to a fixing that is only done at certain points, this has the advantage that the risk of the linear gasifier bending, for example due to buoyancy or flow forces, is reduced. Rather, the solution according to the invention enables a continuous positional accuracy of the linear gasifier. In particular, this allows the linear gasifier to be arranged in an exactly horizontal orientation.

Regarding the latter aspect, it should be noted that since the fixing plate has a flat top, the linear gasifier arranged in the groove extends in a plane parallel to the top of the fixing plate or at an angle of up to 15° to the surface of the fixing plate. The invention thus enables the linear gasifier to extend in an exactly horizontal orientation, so that the liquid column above the individual inlet openings of the linear gasifier is identical over the entire length of the linear gasifier and, accordingly, the gas input into the surrounding liquid via the inlet openings is also identical. This represents a considerable advantage, since even with a slight incline of the fixing plate of, for example, 2% (ie 2 cm height difference per meter), a uniform liquid gassing from the individual entry openings due to a different hydrostatic pressure at the individual entry openings can no longer be guaranteed.

A further advantage associated with the invention is that the entry openings of the linear gasifier are not covered by a fastening due to its arrangement in a groove and thus the entry of gas into the liquid is not impeded. The arrangement of the linear gassing device in a groove also enables the linear gassing device to be assembled and disassembled in a simple manner.

It is pointed out that the linear gasifier according to the invention can have one or more tubes which are accommodated at least in sections in the fixing plate. For the purposes of the present invention, pipes are both pipes and hoses, i.e. the pipe can have a hard or elastic wall. It is also pointed out that the term "gas" also includes gas mixtures.

In one embodiment of the invention, it is provided that the linear gassing device along its entire course, i. H. is fixed along its entire length by the groove. The linear gasser can be arranged in a single fixing plate along the entire course. By fixing the linear gassing device along its entire course, a high degree of positional accuracy of the linear gassing device is made possible at every point.

In a further embodiment of the invention, the device has a plurality of fixing plates, each of which fixes sections of the linear gasifier. In this way, a simplified installation of the linear gasifier in the fixing plates can take place. In addition, with a number of fixing plates, it is possible to intentionally not fix the linear gasifier in certain areas. This can apply, for example, to areas in which no entry openings are formed on the linear gasifier.

It can further be provided that the fixing plates have the same geodetic height in the assembled state of the device. The assembled state is defined as the state in which the linear gasifier is fixed in the groove in its predefined position of the fixing plate. The same geodetic position of the fixing plates ensures that the hydrostatic pressure is the same at the individual entry openings. An area in which the geodetic height of the fixing plates does not deviate from one another by more than 1 cm per meter in the longitudinal and transverse directions is to be understood as being geodetically the same.

In a further exemplary embodiment of the invention, the fixing plate is provided and designed to accommodate a plurality of parallel sections of the linear gasifier. Parallel sections of the linear gassing device exist, for example, when the linear gassing device is designed with a U-shape and the two legs of the U run parallel, or when the linear gassing device runs in a meandering manner between two lateral end regions.

One embodiment provides that the meander-shaped linear gasifier forms two lateral end areas, in which the tube of the linear gasifier is guided back between an angle of between 150° and 210°, and between which a central area is formed, in which a plurality of parallel sections of the linear gasifier are arranged.

In each case, one fixing plate can be arranged in one of the lateral end areas and at least one further fixing plate can be arranged in the middle area. As a result of this exemplary embodiment, the device therefore has at least three fixing plates. The device can also have additional fixing plates. For example, it can be provided that several fixing plates are arranged in the central area, which fix and accommodate the sections of the linear gasifier running parallel.

In a further exemplary embodiment, the groove is designed and provided to fix the linear gasifier in a positive and/or non-positive manner. For example, a non-positive connection can be formed by clamping the linear gasifier in the groove. Fasteners such as screws are not required, but can be used as additional security. However, other connection options, such as a material connection, for example by gluing, are also possible in principle.

For a form-fitting connection between the linear gasifier and the groove, it can be provided, for example, that the groove narrows or tapers in cross-section towards the upper side of the fixing plate. It is provided that the groove is so narrow at a narrowest point that the linear gasifier cannot step out of the groove by itself through the narrowing and is thus trapped in the groove to a certain extent. It can be provided that the groove or the fixing plate itself has a certain flexibility and the groove can be easily bent open for inserting the linear gasifier. In particular, it can be provided that the fixing plate consists of a sufficiently elastic material and the groove is slightly deformed when the linear gasifier is inserted. Provision can thus be made for the narrowest point of the groove to represent an elastic "lip", so to speak, which first deviates in the direction of the groove when the linear gasifier is pressed in before it a further pushing in of the linear fumigator resets itself and encloses the linear fumigator. It can be provided that the groove nestles against the pipe material so that there is no gap and a firm hold is provided between the two parts.

For this purpose, it can be provided that the fixing plate and the linear gassing device are made of different materials, the fixing plate being made of a material with greater elasticity than the linear gassing device. An example of the material of the tube is polyamide. Examples of the fixing plate material are polypropylene (PP), polyethylene (PE) and polyoxymethylene (POM).

It can be provided that the plastic for the linear gasifier and/or for the fixing plate is food safe.

In an alternative embodiment, it is provided that the linear gassing device is designed so flexibly that it can be compressed in such a way that it can be pressed into the groove. In this case, the linear gasifier consists of a material with greater elasticity than the fixing plate.

For a form-fitting fixation of the linear gasifier, one embodiment provides that the groove has a trapezoidal cross section. A trapezoidal shape can be produced in a simple manner, for example, by means of trapezoidal milling cutters. In an alternative, the groove has a circular cross section.

In a further embodiment it is provided that the groove has a rectangular cross section. It is intended to clamp the linear gasifier in the groove with a non-positive fit (press fit) or to glue it with a material bond.

A further embodiment of the invention provides that the groove has a groove depth that is less than the outer diameter of the linear gasser, so that the linear gasser partially protrudes in relation to the upper side of the fixing plate when inserted into the groove. The entry openings are arranged in an area protruding from the surface. This ensures in an effective manner that the gas bubbles passing through the entry openings are converted into the liquid. The greatest distance between a point on the groove and the plane of extension of the upper side of the fixing plate is defined as the groove depth.

In a further embodiment of the invention, it is provided that the pipe of the linear gasifier is removed at least in sections on its outside in the area of the entry openings and forms a removed area there, the pipe having a reduced wall thickness in the removed area and a reduced flow channel length corresponding to the reduction in wall thickness which has entry openings.

This configuration uses the knowledge that when a fluid flows through a flow channel, the walls of the flow channel cause friction. The longer a flow channel is, the longer the friction-inducing walls are and the greater the pressure loss occurring at the flow channel. The design is based on the idea of reducing the pipe wall locally at the entry openings in order to shorten the length of the flow channel for each entry opening and to reduce its inherent length-dependent friction losses, so that the associated pressure loss, which occurs along the through the respective Entry openings formed flow channel between the inside and outside arises to reduce. Accordingly, by shortening the length, a flow channel with reduced friction and thus optimized is formed through the pipe wall, which is also referred to as an optimized flow channel in the following.

In this case, diameters of the entry openings of less than 100 μm are provided. The small diameters of the entry openings serve to form such small gas bubbles in the liquid that they dissolve as completely as possible in the liquid. At the same time, however, the small diameter of the entry openings also results in a high pressure loss when the gas passes through the respective flow channel, since the pressure loss generally increases with a reduction in the diameter for the same volume flow of gas passed through. The reason for this is the physical principle v=Q/A, according to which the gas must be pushed through the cross-section A at a higher speed v when the diameter is reduced while the volume flow Q remains the same. Thus, in the case of linear gasifiers with entry openings with small diameters, the present embodiment achieves a reduction in the pressure losses at the individual entry openings by means of a flow channel that is reduced in length and thus optimized. As a result, the linear gasifier can be operated with less pressure and more energy-efficiently.

This reduction in length of each optimized flow channel is the essential feature of this embodiment, which is also characterized in that the entry openings have a constant quality regardless of the material removal.

A linear gasifier is therefore characterized by high energy efficiency, since a lower pressurization of the gas in comparison to linear gasifiers without material removal in the area of an entry opening is sufficient to conduct sufficient gas through the entry openings. At the same time, sufficient dimensional stability of the tubes is maintained by only partially removing the outside of the tube. In view of the fact that the diameter of the entry openings is very small at a maximum of 100 µm and a gassing system can have over a million entry openings, a reduced pressure loss at each individual entry opening of the linear gasifier enables a large increase in energy efficiency of a gassing system.

A flat surface can be formed on the outside of the linear gasifier due to the removed area. Advantageously, the linear gassing device can be arranged in the groove in such a way that the flat surface extends parallel to the upper side of the fixing plate. It can be provided in particular that the flat surface protrudes from the top.

In a variant of the invention, the wall thickness of the pipe in the removed area is reduced by up to 1% to 99%, in particular 50% to 80%. In this way, an effective shortening of the length of the flow channel of the entry openings is made possible and at the same time sufficient stability of the pipe is maintained.

A further embodiment provides that the removed area forms a flat surface on the outside. The flat surface forms a secant in cross-section which intersects the outside radius and forms a flat surface on the outside of the tube.

In a further embodiment variant, the entry openings are arranged along a line in the direction of the longitudinal axis of the pipe. In principle, the arrangement of the entry openings in a pipe wall configured in this way can be selected as desired, in particular in a way that is advantageous for the desired energy-efficient entry with a linear gasifier. The longitudinal axis extends in the direction of the longitudinal extent of the tube.

In one embodiment, the entry openings of the linear gasifier have a diameter that is less than 50 μm. A diameter in the range of 10 μm to 30 μm can even be provided. Due to this relatively very small diameter of the entry openings, the pressure loss along the exit opening is correspondingly large. Against this background, the optimization by reducing the length of the flow channels of the entry openings by removing part of the tube wall is particularly effective. The diameters in the range of 10 µm to 30 µm allow the gas bubbles to completely dissolve in the liquid.

In a further embodiment, the tube has an inside diameter in the range of 2 to 8 mm, in particular 3.5 mm to 5.5 mm. In particular, the use of commercially available pipes with an inner diameter of 4 mm to 6 mm is provided.

In a further embodiment, before material is removed, the tube has a wall thickness in the range from 0.2 mm to 2.0 mm, in particular from 0.3 mm to 1.1 mm. Commercially available pipes with a wall thickness of 1 mm can be used here.

In a variant of the invention, the removed area is removed with a milling cutter or a planer. In order to produce the tube, it is provided that the tube is guided along the milling cutter or the planer, so that tube material is removed from the outside of the tube. Alternatively, the tube can also be removed by a comparable cutting device. In principle, it is also possible to produce a tube with a flattened area corresponding to the removed area, in which case the flattened area is formed from the beginning during the manufacture of the tube.

A further embodiment of the invention provides that the entry openings extend in the vertical direction in the tube. The vertical direction refers to the position when the tube is placed in a gassing system. The vertical orientation means that the entry ports at the 12 o'clock position are in a radial direction. Unless the entry openings pass through the 12 o'clock position, they are offset horizontally from the 12 o'clock position in the vertical direction. The vertical orientation is advantageous in that it allows the individual entry openings to be formed by laser drilling with a laser arranged above the tube.

It is pointed out that fixing means, e.g. in the form of wedges or pins, can be provided which secure the gassing tube against twisting in the groove.

One embodiment provides that the device is designed to be arranged in a clarification tank in a horizontal orientation near the bottom. It can be provided that the alignment is arranged exactly horizontally or that there is a slight inclination of the linear gasifier. A slight inclination is possible, for example, if the diameter of the entry openings is less than 40 μm.

In a further exemplary embodiment, it is provided that a distributor pipe is arranged on at least one end face of the fixing plate and runs along the end face, with at least one pipe of the linear gasifier being fluidically connected to the distributor pipe. The distributor pipe can be connected to a compressor, for example, which conveys the gas from a reservoir through the distributor pipe to the linear gasifier.

Provision can be made for the at least one tube of the linear gasifier to be curved, with the two ends of the tube both being connected to the distributor tube on the front side. The linear gasifier can have one or more bent tubes. This configuration has the advantage that a gas supply is provided in a simple manner, since only one distribution pipe is required for the gas.

Furthermore, it can be provided that the distributor pipe has openings with seals inserted therein. The end of the at least one tube is inserted into such a seal. A plug-in connection or a screw connection, for example, can be designed for a fixed connection between the seal and the distributor pipe.

It can be provided that the components linear gassing device, fixing plate, seal, distributor pipe are joined together in such a way that all components form a monolithic unit that does not give fibers and comparable fibrous and fibrous substances any possibility of accumulation. Thus, a functional impairment and/or functional restriction in the operating purpose of a linear gasifier, for example due to deposits arranged at the entry openings, is prevented and a consistently effective entry of the gas or a gas mixture into the liquid is provided.

Figur 1

eine Ansicht auf eine Vorrichtung zur Begasung von Flüssigkeiten, bei der ein Linearbegaser in einer Fixierplatte durch eine den Linearbegaser aufnehmende Nut fixiert ist;

Figur 2

ein weiteres Ausführungsbeispiel einer Vorrichtung zur Begasung von Flüssigkeiten mit einem Linearbegaser und einer Fixierplatte;

Figur 3

ein weiteres Ausführungsbeispiel einer Vorrichtung zur Begasung von Flüssigkeiten mit einem Linearbegaser und einer Fixierplatte, wobei der Linearbegaser durch eine Mehrzahl an Fixierplatten fixiert ist;

Figur 4

ein Ausführungsbeispiel einer Fixierplatte mit einer Nut, wobei die Nut exemplarisch unterschiedliche geometrische Formen aufweist;

Figur 5

eine Querschnittsdarstellung zweier Nuten, in denen ein Linearbegaser angeordnet ist, wobei eine Nut kreisförmig und eine Nut trapezförmig ausgebildet ist;

Figuren 6-13

Ansichten verschiedener Querschnittsformen des Linearbegasers;

Figur 14

ein weiteres Ausführungsbeispiel einer Vorrichtung zur Begasung von Flüssigkeiten, wobei mehrere Rohre des Linearbegasers in der Fixierplatte befestigt sind und die Rohre des Linearbegasers jeweils an einer Stirnseite der Fixierplatte enden; und

Figur 15

ein Ausführungsbeispiel einer Vorrichtung bestehend aus einer Fixierplatte mit daran fixierten Rohren des Linearbegasers sowie einem Verteilerrohr, das mit den Rohren verbunden ist und stirnseitig an der Fixierplatte anliegt.

The invention is explained in more detail below with reference to the figures of the drawing using an exemplary embodiment. Show it:

figure 1

a view of a device for gassing of liquids, in which a linear gassing device is fixed in a fixing plate by a groove receiving the linear gassing device;

figure 2

a further exemplary embodiment of a device for gassing of liquids with a linear gasser and a fixing plate;

figure 3

a further exemplary embodiment of a device for gassing liquids with a linear gassing device and a fixing plate, the linear gassing device being fixed by a plurality of fixing plates;

figure 4

an embodiment of a fixing plate with a groove, the groove having different geometric shapes by way of example;

figure 5

a cross-sectional view of two grooves in which a linear gasifier is arranged, one groove being circular and one groove being trapezoidal;

Figures 6-13

Views of various cross-sectional shapes of the linear gasifier;

figure 14

a further exemplary embodiment of a device for gassing of liquids, wherein a plurality of tubes of the linear gassing device are fastened in the fixing plate and the tubes of the linear gassing device each end at an end face of the fixing plate; and

figure 15

an embodiment of a device consisting of a fixing plate with tubes of the linear gasifier fixed thereto and a distributor tube which is connected to the tubes and rests on the front side of the fixing plate.

The figure 1 shows a plan view of a device or an entry system for gassing liquids, in which a linear gassing device 30 is fixed in a fixing plate 31 . The linear gasifier 30 has at least one tube 1 with a large number of entry openings, as shown in FIG figure 5 and the Figures 6 to 13 is described in detail.

In order to introduce gas into a liquid, gas is released into the liquid via the linear gasifier 30 and through the entry openings. This creates gas bubbles, which at least partially dissolve in the surrounding liquid. The linear gasifier 30 is typically attached to the bottom of a tank or reactor and finds use, for example, in oxygenation of lakes and ponds, or in wastewater treatment by the introduction of air, oxygen and/or ozone, or as an oil barrier.

The linear gasser 30 is firmly connected to the fixing plate 31 by a groove 50 . The groove 50 is let into an upper side 35 of the fixing plate 31 and extends over the entire course of the linear gasifier 30 so that it is held firmly in the fixing plate 31 along its entire length. How based on figures 4 and 5 explained further, the groove 50 fixes the linear gasifier via a non-positive and/or positive connection.

in the in figure 1 example shown, the linear gasifier has two ends 33 . The linear gasifier 30 runs in a meandering manner between the ends 33, with straight sections 32 and sections 34 bent in a U-shape alternating in each case. The straight sections 32 are arranged parallel or approximately parallel to one another. The area of the curved sections 34 each forms a lateral end area 40 and the area of the parallel straight sections 32 forms a central area 41.

In the view shown, the two ends 33 of the linear gasifier 30 are shown as open ends. In the installed state, however, it is provided that the ends 33 are each connected to a connection. In this case, for example, a gas supply line, a connecting section to a further linear gasifier 30 or a sealing plug are provided as a connection.

The figure 2 shows a further exemplary embodiment of an entry system for gassing of liquids with a linear gasser 30 which is fixed by a groove 50 on a fixing plate 31. The course of the linear gasifier 30 is in turn meandering with straight sections 32 and curved sections 34, the curved sections 34 being different than in FIG figure 1 are not U-shaped but more circular with a bend of more than 180°. According to the figure 1 forms a portion of the curved sections 34 each have a lateral End area 40 and the area of straight sections 32 arranged in between form a middle area 41.

in the in figure 2 illustrated embodiment, the respective ends 33 of the linear gassing device 30 are arranged on the edge of the fixing plate 31 . In this way it is possible in a simple manner to fasten a further fixing plate with a further linear gassing device, not shown, to the fixing plate 31 and thus to connect the linear gassing device 30 to the further linear gassing device.

In figure 3 another exemplary embodiment is shown, in which the linear gassing device 30 runs in a meandering shape. The linear gasifier 30 is in contrast to the figures 1 and 2 not continuously fixed by the groove 50 in just one fixing plate, but in sections by a plurality of fixing plates 311, 312 in one groove 50 each.

In the lateral end regions 40, the linear gasifier 30 is fixed by two fixing plates 310 each. The course of the grooves 50 corresponds to the course of the linear gasifier 30. Two fixing plates 311 are arranged in the central region 41, which fix the straight, parallel sections 32 of the linear gasifier 30. For this purpose, a large number of parallel grooves 50 are embedded in the fixing plate 311, as shown in FIG figure 4 is explained in more detail.

It is pointed out that the number of fixing plates 311 shown in the middle area is only to be understood as an example and their number depends on the length of the sections 32 and the overall construction.

It can also be provided in a modification that only the sections 32 of the linear gasifier running in a straight line are fixed in a fixing plate, while the end regions 40 are not fixed in a fixing plate. The fixing plates 310 are then not present. This can be the case, for example, when the linear gasifier does not have any entry openings in the end regions 40 . It should be noted here that high requirements apply to the positional accuracy of the entry openings for an even entry of bubbles. However, if no insertion openings are formed in the bent sections 34, a less firm fixation in this area may also be sufficient as a result.

Also only an example is in the Figures 1-3 illustrated meandering course of the linear gasifier 30 to understand. In principle, numerous forms of the course of the linear gasifier 30 are possible, for example a spiral form, a serpentine course and a combination of different courses.

The figure 14 shows another embodiment of a fixing plate 31, in which a plurality of tubes 1 of a linear gasifier 30 are used. In the embodiment of figure 14 the linear gasifier 30 thus comprises a plurality of tubes 1. The fixing plate 31 has an end face 311, on which the tubes 1 of the linear gasifier 30 terminate with both ends 33 in each case. It can be provided that the linear gasifier is fluidically connected at the ends 33 to a distributor pipe, not shown, as shown in FIG figure 15 explained.

Starting from the end face 311, the tubes 1 of the linear gasifier 30 arranged in the fixing plate 31 initially extend in a central region 41 of the fixing plate 31 in a straight line and parallel to one another. There they form rectilinear sections 32. In a region of the fixing plate 31 opposite the end face 311, the tubes form curved sections 34, in which the tubes 30 are deflected. The corresponding groove in the fixing plate 31 are bent accordingly.

However, this shape is only to be understood as an example. Alternatively, the tubes 1 can be guided in a different way between the ends 33 ending at the end face 311 . The exemplary embodiment is associated with easier final assembly, since a distributor pipe only has to be attached to one side of the fixing plate 31 and this has to be connected to the linear gasifiers 30 .

In exemplary embodiments that are not shown, it can alternatively be provided that in each case one end 33 of the tubes 1 is closed and only the other end is charged with gas, for example via a distributor tube arranged on the front side.

The figure 15 represents a composite of fixing plate 31, a linear gasifier 30 with a plurality of tubes 1, which are inserted into corresponding grooves of the fixing plate 31, and a distributor pipe 100. Via the distributor pipe 100 pressurized gas, for example from a compressor, to the Pipes 1 are passed. The distribution pipe 100 has a multiplicity of openings for connection with the pipes 1 . Seals 101 are screwed or inserted into the openings of the distribution pipe 100, into which the pipes 1 of the linear gasifier 30 are in turn inserted. In the the seals 101 used in the openings form integrated seals in this sense, which can already be pre-assembled in the distribution pipe 100 in the case of final assembly. The respective connections are designed in such a way that there is a secure hold between distributor pipe 100 and pipe 1 . The distributor pipe 100 is arranged along one of the end faces 311 of the fixing plate 31 and is connected to the fixing plate 31 via one or more clamps 102, for example. The clip 102 is connected at one end to the fixing plate 31 via connecting means, in particular rivets or screws, and has an arcuate bracket 103 at the other end for receiving the distributor pipe. The clamp 102 can be a 3D-printed plastic part whose bracket 103 is dimensioned in such a way that the distributor tube 100 is clamped into the bracket.

The illustrated embodiment enables tool-free assembly, since the insertion of the seals 101 into the distributor pipe 100, the insertion of the pipes 1 of the linear gasifier 30 into the seals 101 and the clamping of the distributor pipe 100 against the clamp 102 attached to the fixing plate 31 is possible by hand.

In the assembled state, it is intended that the components form a mechanically connected, monolithic unit without a gap being formed between the fixing plate 31 and the distributor pipe 100 . Gaps are to be avoided, since fibrous materials can get stuck or accumulate in open spaces. The adhesions or accumulations can serve as a surface for the water to attack. This results in increased mechanical stress, in particular due to strong tensile forces. In addition, with increasing size, the deposits can cover surface areas above the fixing plate, so that the entry openings are partially covered and the effective entry area for gas entry is reduced.

It can be provided that the fixing plate 31 can be used in a modular manner. For example, a large number of modular fixing plates 31 can be arranged next to one another and connected to a connecting tube 100 .

The figure 4 12 shows an exemplary embodiment of a fixing plate 31. A plurality of parallel grooves 50 running in a straight line are embedded in the fixing plate 31. FIG. The fixing plate 31 is suitable, for example, according to figure 3 to fix a linear gasifier 30 in a middle area 41 . There are in the figure 4 Grooves 50-53 with different cross-sectional shapes 50-53 are formed in the fixing plate 30, the different groove shapes being shown in an example only for clarity. It is in itself provided that the groove 50-53 has the same cross-section over the entire course of the linear gasifier 30, although this is not necessarily the case.

The groove 5 extends from the top 35 of the fixing plate 31 in the direction of a bottom 36 of the fixing plate 31. For fixing the linear gasser in the groove 50-53, the groove 50-53 can be shaped such that the linear gasser 30 is held in a form-fitting manner. For this purpose, for example, a trapezoidal cross-sectional shape 52 or a cross-sectional shape 53 in the form of a circular arc is provided. With these cross-sectional shapes, the groove 52, 53 narrows towards the surface 35 of the fixing plate 31, so that the linear gasifier is held in the groove 52, 53 in a form-fitting manner when inserted.

In an alternative embodiment, a rectangular cross-sectional shape of the groove 51 is provided, with the groove 51 being formed so wide in this case that the linear gasifier 30 is clamped in the groove 51 with a press fit and is therefore held by a force fit. As an alternative to this, in the case of a rectangular cross-section it can be provided to fix the linear gasser in the groove 51 by means of an adhesive.

The groove 51-53 is formed in the fixing plate 31, for example, by means of a correspondingly shaped milling cutter. Alternatively, the fixing plate 31 can be made with the groove.

In the figure 5 two examples of a form-fitting fixation of the linear gasifier 30 in a groove 52, 53 are shown. The recording of the linear gasifier 30 in a groove with a circular arc-shaped cross section 53 and with a trapezoidal cross section 52 is shown. In the case of both cross-sectional shapes, the form fit is realized by a narrowing of the groove 52 , 53 towards the surface 35 of the fixing plate 31 . The groove 52, 53 forms a narrowest point 502 in the plane of the surface 35. It applies that the width of the groove 52, 53 at the narrowest point 502 is less than the diameter of the linear gasifier 30, so that it is fixed in the groove 52 , 53 is held and cannot slip out. At the narrowest point 502, the groove 52, 53 forms two lips 520, 530.

The groove 52, 53 has a width and a depth. The depth of the groove 52, 53 corresponds to the smallest distance between the deepest point 501 of the groove 52, 53 and the extension plane of the surface 35 of the fixing plate 31. The width of the groove 52, 53 is determined by the distance between two equally deep points in a transverse to Extension direction of the groove is defined running direction and is accordingly height-dependent.

The linear gasifier 30 is formed by a tube 1 in which material is removed from part of the tube wall on the outside 11 of the tube 1, so that a flat surface 95 is formed on the outside 11 of the tube 1. The linear gasser 30 is arranged in the groove 52, 53 in such a way that the flat surface 95 extends parallel to the surface 35 of the fixing plate and projects in relation to it.

Furthermore, two entry openings 4 are shown in the respective cross-sectional view of the linear gasifier 30 , which are each part of a row of entry openings 4 in the linear gasifier 30 running in the direction of the linear gasifier 30 . In this context, reference is made to the Figures 6 to 13 illustrated embodiments referred, in particular to the figure 12 , in which a flat surface 95 and two rows of parallel entry openings 4 are shown in accordance with this exemplary embodiment.

The flat surface 95 is intended to protrude from the surface 35 of the fixing plate 31 . It applies to the depth of the groove 52, 53 that this is less than the outer diameter of the linear gasifier 30. Even when using a linear gasifier with a removed area designed in a different way and a flat surface 95 provided thereby, for example corresponding to Figures 7-9 and 13 , Provision can be made for the flat surface 95 to protrude from the surface 35 of the fixing plate 31 .

To insert the linear gasser 30 into the groove 52, 53, it can be provided that the fixing plate 31 consists of a material that has sufficient flexibility so that the linear gasser 30 is bent open with elastic deformation of the lips 520, 530 when the linear gasser 30 is inserted. In this case, the material of the fixing plate 31 has greater elasticity than the material from which the linear gasifier 30 is formed. Alternatively, it can be provided that the linear gassing device 30 can be compressed in such a way that the linear gassing device 30 can be inserted past the narrowest point 502 into the groove 52 , 53 . In this case, the material from which the linear gasifier 30 is made has greater elasticity than the material of the fixing plate 31.

The embodiment of figure 5 combines the advantages of arranging the linear gassing device in grooves of a fixing plate with the advantages of a linear gassing device which is removed in the area of the entry openings and has a reduced wall thickness and a correspondingly reduced flow channel length of the entry openings there.

In particular, fixing the linear gasifier in the grooves of a fixing plate enables the fixing plate and the linear gasifier to be aligned exactly horizontally, so that essentially the same hydrostatic pressure prevails at the inlet openings and the gas escaping from the inlet openings accordingly escapes to the same extent over the length of the linear gasifier .

The Figures 6 to 13 show in cross section various examples of a linear gasifier which can be used in a device according to the invention for gassing of liquids.

This in figure 6 The illustrated example of a linear gasifier has a tube 1 with the outside 11 and an outside radius R1 and an inside 12 with an inside radius R2. The difference between the outer radius R1 and the inner radius R2 defines a wall thickness S of the pipe 1. The pipe 1 has, for example, an inner diameter of 4 mm with a wall thickness S of 1 mm. Alternative, non-illustrated exemplary embodiments see an inner diameter in the range of 2 mm to 6 mm, in particular 3.5 mm to 5.5 mm and a wall thickness S in the range of 0.2 mm to 2.0 mm, in particular from 0.3 to 1.1mm ahead. A large number of entry openings 4 are embedded in the tube 1, through which the gas is conducted from the interior 2 into the surrounding liquid medium.

The entry openings 4 can be synonymously referred to as exit openings and form a flow channel which extends from the inside 12 to the outside 11 of the tube and which has a length.

In this cross-sectional view, only one entry opening 4 is shown in each case, with further entry openings being arranged along a line/row along the longitudinal axis of the tube. The entry opening 4 has an inner end 5 arranged on the inside 12 and an outer end 6 arranged on the outside 11 . Accordingly, the distance between the inner end 5 and the outer end 6 defines the length of the flow channel.

The pipes are made of polyamide 6 (PA 6), for example. In alternative embodiments, other materials, in particular other plastics, can also be used.

in the in figure 6 In the illustrated embodiment of a linear gasifier, both the inside 12 and the outside 11 of the tube 1 have a circular cross section. The optimized flow channel 4 formed by the entry opening 4 extends in the radial direction. The length of the flow channel defined by the distance between the inner end 5 and the outer end 6 corresponds to the wall thickness S of the tube.

Exemplary embodiments will be discussed, which are different from the figure 6 provide a material removal of the tube 1 on the outside 11.

The figure 7 shows an embodiment of a linear gasifier, in which material has been removed from part of the pipe wall on the outside 11 of the pipe 1 . The material can be removed from the pipe wall, for example, by milling, planing or with a comparable cutting device. As a result of the removal, a removed area 8 is formed, which represents an area with a reduced outer radius R1 and through which the wall thickness S in the area of the removal is reduced by up to 99%, in particular by 50% to 80%.

In this exemplary embodiment, a flat surface 9 is formed on the outside 11 of the pipe 1 by the removed area 8 . The entry opening 4 is arranged at the point in the removed region 8 where the wall thickness S is the smallest and the flow channel extends in the radial direction from the inner end 5 arranged on the inside 12 to the outer end 6 arranged on the outside 11 of the Entry opening 4. Thus, the length of the flow channel formed by the distance between the outer end 6 and the inner end 5 compared to in figure 6 example shown reduced and therefore optimized.

Basically, when a fluid flows through a flow channel (here: the entry opening 4), the resulting pressure loss depends on the length of the flow channel: the longer the channel, the greater the pressure loss that occurs. According to this principle, a pressure loss occurs when flowing through the flow channel at the entry openings 4 between the inner end 5 and the outer end 6 . Due to the removal of material on the outside 11 of the pipe 1 and thus the reduction in the length of the flow channel, the pressure loss when the gas passes through the inlet opening 4 is reduced and the flow channel is optimized in terms of flow technology. Accordingly, by shortening the length, a flow channel with reduced friction and thus optimized is formed through the tube wall, which is also referred to below as an optimized flow channel. This plays in particular, a major role with a large number of entry openings and a small diameter of the entry opening, which is present at a maximum of 100 microns.

In the linear gasifier shown, the flow channels formed by the entry opening 4 have a diameter in the range from 10 μm to 30 μm. In alternative embodiments, the diameters can be larger, but not larger than 100 μm. Due to the small flow diameter, the pressure resistance increases accordingly when flowing through the flow channel. In particular with such small diameters, reducing the pressure resistance by shortening the length of the flow channel represents an effective improvement in the functioning of a linear gasifier and a gassing device comprising a plurality of linear gassers.

In the exemplary embodiment, the removed area 8 extends over the entire longitudinal axis or longitudinal extension of the pipe. In alternative exemplary embodiments, however, the removed area 8 can also be formed along only one pipe section or along several pipe sections.

The figure 8 shows one of figure 7 corresponding further embodiment in which compared to figure 7 However, significantly more material is removed from the pipe 1, so that the length of the flow channels 4 formed by the entry opening 4 is significantly shorter and the pressure loss when flowing through each flow channel is further optimized because it is reduced.

The figure 9 represents another variant of a tube 1 for a linear gasifier Figures 7 and 8 shown, a flat surface 9 is formed by the removed area 8 . In contrast to the previously mentioned exemplary embodiments, the optimized flow channel of the entry opening 4 in this exemplary embodiment is not arranged in the radial direction and not perpendicular to the flat surface 9 . In this way, the flow channel 4 does not form the shortest possible connection between the inside 12 and the outside 11 of the pipe 1. However, due to the removed area 8, the length of the flow channel 4 is shorter than that in FIG figure 6 illustrated embodiment of an untreated pipe 1 reduced and therefore optimized.

figure 10 Figure 12 shows a tube with two eroded areas 81, 82, each forming a flat surface 91, 92 on the outside of the tube and in each of which infeed openings 4 with optimized flow channels are embedded along a line. In this example meet the two flat surfaces 91, 92 together. In further exemplary embodiments, it can alternatively be provided that the flat surfaces 91, 92 do not touch one another, so that they each run up to the outer radius R1 of the pipe 1.

The two removed areas 81, 82 and the optimized flow channels arranged on the flat surfaces 91, 92 are arranged symmetrically to one another, with the axis of symmetry 10 running through the center point of the pipe (not shown) and the point of contact of the flat surfaces 91, 92. As shown here, the optimized flow channels of the entry openings 4 can run parallel to the axis of symmetry 10 and accordingly also parallel to one another. In this way it is ensured that the flow channels can have the same length in both removed areas 81, 82 and thus the pressure resistance in the optimized flow channels can be the same. With the same pressure resistance, it is thus achieved that the gas flow passing through the individual entry openings 4 can be of the same size.

The configuration according to figure 10 is suitable for linear fumigators, where the tubes can have at least two rows of entry openings.

The figure 11 shows another embodiment of a tube 1 for a linear gasifier, in which two areas 83, 84 are removed. The two removed areas 83, 84 are arranged opposite one another, so that the flat surfaces 93, 94 formed by the two areas 83, 84 run parallel to one another. A first area 83 has been removed to a greater extent than a second area 84, so that the length of the optimized flow channel 4 in the first area 83 is also shorter and the pressure resistance in this first area 83 is therefore also lower.

This arrangement enables the gas to be conveyed into the surrounding liquid medium only from the shorter optimized flow channel at lower pressure and from the longer optimized flow channel at higher pressure, with this mode of operation making it possible to adapt the required gas volume flow to the required input quantity with only a tube of a linear gasifier.

The design of figure 11 is an example of the fact that the entry opening does not necessarily have to run in the vertical direction, but can also be aligned radially if they are not in the 12 o'clock position of the deposited tube and, as a result of this variant, a needs-based one entry control is available. However, this configuration is only suitable for arrangement in a groove if there is still sufficient distance to the groove wall so that the gas can escape from the groove into the liquid. This can be the case, for example, in configurations in which the linear gasser is glued into the groove.

The figure 12 shows a further embodiment of the linear gasifier. An area 85 on the top of the tube is removed, which corresponds to the removed area 8 of the in figure 7 shown embodiment corresponds. In contrast to figure 7 two parallel rows of entry openings 4 are embedded in the removed area 85 . The two entry openings 4 are spaced so far apart that gas bubbles 3 flowing out of the entry openings 4 cannot coalesce in the liquid medium. Similar to the in the figure 10 In the exemplary embodiment shown, the linear gasifier is symmetrical, with the axis of symmetry 10 running centrally between the entry openings 4 and through the center point of the tube 1, which is not shown. The two flow channels of the entry openings 4 run parallel to one another and parallel to the axis of symmetry 10.

In addition, a worn bottom area 86 is formed for increased positional stability. The removed floor area 86 represents an underside of the linear fumigator, so that the linear fumigator can rest flat against a flat floor.

The figure 13 FIG. 12 represents a further embodiment of a linear gasifier. In this case, two removed areas 87, 88 are formed, in each of which entry openings 4 with optimized flow channels are arranged. In contrast to the previous exemplary embodiments, the outside of the linear gasifier at the removed area 87, 88 is not formed by a single, continuous, flat surface, but is designed in steps. In each case, a corner is formed by a flat surface 97, 98 and a vertical wall 11, 12. The vertical wall 11, 12 extends in each case from the flat surface 97, 98 in the vertical direction towards the outside 11. The flat surfaces 97, 98 lie in a common plane. The two vertical walls 11, 12 form a radial projection between the flat surfaces 97, 98.

In this way, a remaining area without material removal is formed between the removed areas 87, 88. As a result, the pipe 1 has greater overall mechanical stability. In addition, the vertical walls 11, 12 partially protect the gas bubbles 3 introduced into the liquid medium by preventing the bubbles 3 flow directly to the adjacent entry opening 4 and possibly coalesce with other bubbles 3 there.

The vertical walls 11, 12 are formed parallel to each other in this embodiment. In further embodiment variants, however, provision can also be made for the vertical planes 11, 12 not to be perpendicular to the planar surfaces 97, 98 and/or parallel to one another, but rather at any angle.

Furthermore, in the example, one of the figure 13 a removed bottom area 86 is also formed.

It should be understood that the invention is not limited to the embodiments described above, and various modifications and improvements can be made without departing from the concepts described herein. For example, provision can be made for further removed areas to be provided, each with entry openings 4 with optimized flow channels arranged there. Also, for example, a removed floor area 86 in combination with in the Figures 1 to 11 shown embodiments may be provided. Furthermore, it can be provided in all of the exemplary embodiments that the optimized flow channels extend in the radial direction or not in the radial direction.

It is understood that any of the features described may be used separately or in combination with any other feature, provided they are not mutually exclusive. The disclosure extends to and encompasses all combinations and sub-combinations of one or more features described herein. If ranges are defined, these include all values within these ranges as well as all sub-ranges that fall within a range.

Claims (15)

Device for gassing liquids, which has - at least one linear gasifier (30) for introducing gas into a liquid, the linear gasifier (30) having at least one tube (1) with at least one entry opening (4), - a fixing plate (31) with a flat top (35), - At least one groove (50, 51, 52, 53) which is embedded in the top (35) of the fixing plate (31) and in which at least one section of the linear gasifier (30) is received and fixed. Device according to Claim 1, characterized in that the linear gasser (30) is fixed along its entire course by the groove (50, 51, 52, 53). Device according to Claim 1 or 2, characterized in that the device has a plurality of fixing plates (310, 311) which each fix sections of the linear gasifier (30). Device according to one of the preceding claims, characterized in that the fixing plate (31) is provided and designed to accommodate a plurality of parallel sections (32) of the linear gasser (30). Device according to one of the preceding claims, characterized in that the linear gassing device (30) runs in a meandering manner between two lateral end regions (40). Device according to one of the preceding claims, characterized in that the groove (52) has a trapezoidal or circular or rectangular cross-section. Device according to one of the preceding claims, characterized in that the groove (50, 51, 52, 53) is designed and provided to fix the linear gasser (30) in a positive and/or non-positive manner. Device according to Claim 7, characterized in that the groove (50, 52, 53) narrows in cross-section towards the upper side (35) of the fixing plate (31). Device according to one of the preceding claims, characterized in that the groove (50, 51, 52, 53) has a groove depth that is less than the outer diameter of the linear gasifier (30), so that the linear gasifier (30) when inserted into the groove compared to the top (35) protrudes partially. Device according to one of the preceding claims, characterized in that the pipe (1) of the linear gasifier (30) is removed at least in sections on its outside (11) in the area of the entry openings (4) and forms a removed area (8) there, the Pipe (1) has a reduced wall thickness (S) in the removed area (8) and a correspondingly reduced flow channel length of the entry openings (4). Device according to one of the preceding claims, characterized in that the device is designed to be arranged in a clarification tank in a horizontal orientation near the bottom. Device according to one of the preceding claims, characterized in that the fixing plate consists of a more elastic material compared to the material of the linear gasifier. Device according to one of the preceding claims, characterized in that a distributor pipe (100) is arranged on at least one end face (311) of the fixing plate (31) and runs along the end face (311), at least one pipe (1) of the linear gasifier ( 30) is fluidically connected to the distribution pipe (100). Device according to Claim 13, characterized in that the at least one tube (1) of the linear gasifier (30) is curved, with the two ends (33) of the tube (1) both being connected to the distributor tube (100) on the end face (311). are connected. Device according to Claim 13 or 14, characterized in that the distributor pipe (100) has openings with seals (101) inserted therein, the at least one pipe being inserted into such a seal 101 at at least one end.

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