WO2016015991A1

WO2016015991A1 - Method and device for dosing and mixing at least one fluidic medium into a process stream

Info

Publication number: WO2016015991A1
Application number: PCT/EP2015/066024
Authority: WO
Inventors: Thomas Jaschinski; Walter Notar
Original assignee: Voith Patent Gmbh
Priority date: 2014-07-29
Filing date: 2015-07-14
Publication date: 2016-02-04
Also published as: EP3174624A1

Abstract

In a method for dosing and mixing at least one fluidic medium into a process stream used, in particular, for producing a fibrous material- or nonwoven web, at least one fluidic medium is injected into the process stream by means of a fluidic oscillator. Also disclosed is a corresponding device for carrying out the method.

Description

METHOD AND DEVICE FOR DOSING AND MOUNTING AT LEAST ONE

FLUIDEN MEDIUMS IN A PROCESS STREAM

The invention relates to a method and a device for metering and mixing at least one fluid medium into a process stream which is used in particular for producing a fibrous or nonwoven web. Dosing and subsequent mixing of chemicals into the papermaking process are subject to special requirements. In this case, the amounts of chemicals can be reduced to a considerable extent with an efficient mixing and a needs-based dosage such as an addition dependent on the amount of pulp.

In addition, increasing costs for energy, raw materials, fresh water and chemicals require their most efficient use. In this case, for example, the amounts of energy that are required for the heating of fresh water for the dissolution or dilution of process chemicals. Warming the process chemicals to bulk temperature is necessary to avoid thermal shock during mixing, thus ensuring efficient incorporation into the fabric and optimal action of, for example, a retention chemical. In order to limit the consumption of process and functional chemicals as well as the use of fresh water as a dilution medium in the treatment of chemicals, there is a need for the most efficient method for metering and mixing of chemicals in the process stream during the production of fiber and / or nonwoven web. The invention is therefore based on the object of specifying a method and a device of the type mentioned, with which the most efficient and cost-effective chemical dosing and -einmischung in a process stream, in particular a process stream of a process for producing a fiber or nonwoven web can be achieved , In particular, a dependent on the process stream, for example, depending on the consistency and / or state of charge, dependent volume-controlled metering in particular a fluid process and / or functional chemical is to be made possible. The object is achieved by a method having the features of claim 1 and a device having the features of claim 10. Preferred embodiments of the method according to the invention and preferred embodiments of the device according to the invention are specified in the subclaims.

The process according to the invention for metering and mixing at least one fluid medium into a process stream which is used in particular for producing a fiber or nonwoven web is characterized in that at least one fluid medium is injected into the process stream via a fluidic oscillator.

Fluidic oscillators are already known as such and may in particular each comprise a nozzle, a mixing chamber and return flow channels. Fluidic oscillators or fluidic oscillators are characterized by a self-excited oscillation in their interior, which manifests itself either in an oscillating free jet at the output of the component or by a periodic switching between two discrete outlets. When fluid is applied to the component, the resulting jet automatically lays on one side in the mixing chamber. Downstream of the mixing chamber, the jet bounces against a wall and splits into two streams. The main flow leaves the component through one of the outlets. The second stream is passed through one of the so-called return flow channels and arrives the nozzle on the main stream and pushes it to the opposite wall in the mixing chamber. The process then runs mirror-inverted and the beam leaves the component through the other outlet. Subsequently, the process is reinitialized. Fluidic oscillators offer the potential for high mixing without increasing pressure or having to use moving parts. They produce at their outlet a periodically oscillating beam. Possible embodiments of such fluidic oscillators are also described, for example, in EP 0 319 594 B1. By using one or more such fluidic oscillators, a more efficient metering and mixing of chemicals into the process stream is possible, which in particular also minimizes the costs for energy, raw materials, fresh water and chemicals. Preferably, at least one fluid medium injected into the process stream via a fluidic oscillator contains at least one chemical.

In particular, it is also advantageous if fluid media are injected into the process stream via at least one arrangement of in each case at least two fluidic oscillators. In this case, the fluid oscillators of a respective fluid oscillator arrangement are preferably arranged relative to one another such that their exit beams are pivoted in different planes.

By mixing the fluid streams emerging from the various fluidic oscillators, the mixing is further optimized.

In this case, for example via at least one arrangement of two fluidic oscillators fluid media can be injected into the process stream, which are arranged relative to each other so that their exit beams are pivoted in orthogonal planes. In this case, the two fluidic oscillators a corresponding fluidic oscillator arrangement relative to each other, for example, be arranged so that the exit jets are pivoted in a vertical and in a horizontal plane. This arrangement thus enables the simultaneous emergence of beams in a vertical and a horizontal plane relative to each other, wherein the mixture of the two streams takes place when the two beams from the fluid oscillators emerge.

However, such embodiments of the method are also conceivable in which fluid media are injected into the process stream via at least one arrangement of more than two fluid oscillators in each case. In this case, the fluid oscillators are preferably arranged relative to one another such that their exit jets are pivoted in different planes.

According to a further advantageous embodiment of the method according to the invention fluid media are injected into the process stream over a plurality of circumferentially distributed around the process flow fluid oscillators and / or fluid oscillator arrangements of a plurality of fluidic oscillators fluid.

With such a design, the dosing and mixing process is further optimized.

According to a preferred practical embodiment of the method according to the invention, at least one fluid medium is injected into the process stream via a combination of a mixing nozzle and at least one fluidic oscillator. In this case, for example, an arrangement of at least two fluid generators can be used in combination with a mixing nozzle, wherein, for example, a chemical is previously mixed with a carrier fluid and then applied prior to metering to eg one or more fluid oscillators arranged at an angle to each other. By means of such an arrangement, the chemical to be metered, for example premixed in a carrier fluid can be mixed in an oscillating manner in another fluid stream. The mixing nozzle is preferably connected upstream of the fluidic oscillator.

It is also particularly advantageous if the mixing nozzle is supplied with at least two fluids and mixed and / or reacted with one another in this mixture.

The device according to the invention for metering and mixing at least one fluid medium into a process stream which in particular serves to produce a fibrous or nonwoven web is correspondingly characterized in that it comprises at least one fluid oscillator for injecting at least one fluid medium into the process stream.

Preferably, at least one fluid medium which can be injected into the process stream via such a fluidic oscillator contains at least one chemical.

According to a preferred practical embodiment of the device according to the invention, this device comprises at least one arrangement of at least two fluidic oscillators for the injection of fluid media into the process stream. In this case, the fluid oscillators of a respective fluid oscillator arrangement are preferably arranged relative to one another such that their exit beams are pivoted in different planes.

In this case, the device may in particular comprise at least one arrangement of two fluidic oscillators for the injection of fluid media into the process stream, which are arranged relative to each other so that their exit jets in orthogonal planes, for example in a horizontal and a vertical plane, are pivoted.

Preferably, the device comprises at least one arrangement of more than two fluidic oscillators for the injection of fluid media into the process stream, the relative in particular are arranged so that their exit jets are pivoted in different planes.

It is also particularly advantageous if the device comprises a plurality of circumferentially distributed around the processor fluid oscillators and / or fluid oscillator arrangements of a plurality of fluidic oscillators for the injection of fluid media in the process stream.

According to a preferred practical embodiment of the device according to the invention, this comprises at least one combination of a mixing nozzle and at least one fluidic oscillator for injecting a fluid medium into the process stream. In this case, the mixing nozzle is preferably connected upstream of the fluidic oscillator.

According to a further expedient embodiment of the device according to the invention, at least two fluids can be fed to the mixing nozzle and can be mixed with one another and / or reacted in the mixing nozzle.

The mixing nozzles can be designed, for example, as described in DE 10 2010 028 573 A1 or DE 10 2010 028 572 A1.

Thus, for example, at least one fluid medium and one fluid chemical can be metered and mixed into a process stream by means of the method or device according to the invention. The process stream may in particular be a fluid process stream of a production process, preferably a process for producing a fiber or nonwoven web. For example, a metered addition of a fluid medium diluted in a dilution medium, for example a process or functional chemical or a partial fluid stream, may be mixed in a mixing nozzle. Subsequently, the fluid medium can be passed into a fluidic oscillator and then metered into the process stream, ie the further fluid stream. In principle, only one fluid can be metered by means of a fluidic oscillator or by means of a combination of a mixing nozzle and at least one fluidic oscillator. The outflow of a fluidic oscillator can, for example, be arranged perpendicularly or transversely to the fluid flow of the fluid flow into which the mixture flows. In addition, several combinations of mixing nozzle and fluidic oscillator can be arranged, for example, around a pipeline. By overlapping the jet pattern of individual fluidic oscillators with the jet pattern of respectively adjacent fluidic oscillators, a uniform transverse distribution into the process stream can be achieved.

By means of the angle change, e.g. the penetration of the process stream can be adjusted. Thus, it is possible, for example, to influence a metered partial fluid flow or a chemical metering in its intensity in such a way that it does not completely penetrate the process stream and thus penetrates the process stream, for example, only to the middle. By means of the adjustable beam intensity, the energy required for metering can be adjusted controllably, so that the metering process can be performed energy-efficiently.

By means of the metering principle it can be achieved that the entire process stream for producing a paper or nonwoven web, for example a fibrous or nonwoven suspension, is penetrated essentially simultaneously by the fluid process or functional chemical and the fluid process or functional chemical is mixed with the process stream , It is essential here that the fluid process or functional chemical is mixed evenly distributed in the process stream. The fluid chemical may also be a mixture of process and functional chemical. In addition, it may be a solid suspended in a fluid medium, such as a filler slurry. The outlet nozzles of the fluidic oscillator can in particular be arranged in such a way that they cover at least part of a circular arc (arc length) on a cylindrical, curved surface, for example a pipeline, wherein in the case of a plurality of juxtaposed openings, one circular segment can be covered by a respective nozzle arrangement and thus a complete annular arrangement around the cylindrical circumference of a pipe through a corresponding number of nozzle arrangements (fluidic oscillators) is given. In this way, the metering streams can be very efficiently mixed with the entire process stream.

For example, a particular partial stream may be part of the process stream itself. However, it may also be, for example, other process streams, such as e.g. White water, or filtrates, such as clear filtrate or super clear filtrate or also fresh water, e.g. Hot water, act.

The chemical to be metered may be, for example, a retention agent, for example polyacrylamide (PAM), polyethyleneimine (PEI), polyamidoamine (PAAm), crosslinkable polyamidoamine resins, PolyDADMAC, polyvinylamine (PVAm) or polyethylene oxide (PEO). In addition, the chemical to be metered may also be, for example, a microparticle or nanoparticle, e.g. Concrete or a silicate.

Further, the chemical to be dosed may be starch or a biocide, or e.g. to act a dye or an optical brightener.

Further, the chemical may be neutralizing agents, e.g. AKD (alkyl ketene dimer) or ASA (alkenyl succinic anhydride) act.

The chemicals to be dosed may generally be all chemicals and additives used in papermaking in particular fluid form (solution, dispersion or suspension) can be brought. In addition, by means of the combination of mixing nozzle and fluidic oscillator, a gas can also be metered in addition to a fluid flow or a plurality of further fluid flows. The flow rate in the feed device, for example, of the partial fluid flow or the chemical metering flow is expediently to be chosen so high that no deposits can form. The flow rate may in particular be in the range of 0.05 to 20 m / s, preferably in the range of 0.1 to 10 m / s and especially in the range of 0.1 to 5 m / s.

A particular combination of mixing nozzle and fluidic oscillator can be used with advantage in particular also for generating a precipitation reaction with subsequent metering.

The combination of mixing nozzle and fluidic oscillator is not limited to the exclusive dosage of liquid, fluid chemicals. Thus, in the combination of mixing nozzle and fluidic oscillator, in addition to liquid, fluid chemicals, a gas, such as e.g. CO2 and e.g. Hydrated lime, e.g. as a suspension (milk of lime, slurry of calcium hydroxide in water) or as lime water to be reacted.

The solubility of hydrated lime Ca (OH) ₂ in water is only 1.7 g / l at 20 ° C., the solubility decreasing as the temperature increases. Preferably, therefore, a Kalkmilchsuspension is used, which then has a much higher concentration of, for example, 30 to 150 g / l of Ca (OH) ₂ . For example, it is also possible to use a high-purity aqueous solution of hydrated lime and to react it with CO2 in the mixing space provided by means of the mixing / reaction / nozzle arrangement. For example, carbonic acid water may also be brought in the combination of the mixing nozzle and the fluidic oscillator in reaction with a slurry of lime (lime milk) or an aqueous solution of hydrated lime. In the production of calcium hydroxide from hydrated lime Ca (OH) ₂ , the suspension can be adjusted immediately to the use concentration. It is also conceivable, for example, to adjust the use concentration directly in the combination of mixing nozzle and fluidic oscillator prior to contact with the CO2 by mixing in another dilution fluid in an upstream mixing zone.

When using lime milk, it may also be advantageous if a filter is connected upstream in the feed to the combination of mixing nozzle and fluidic oscillator, so that insoluble constituents are retained in order to prevent clogging of the metering system. When dosing lime water, filters can be dispensed with. When using lime milk, the flow rate should expediently not fall below 1, 0 m / s and preferably greater than 1, 5 m / s are selected. Especially with larger line lengths or feeds to the nozzle assembly greater than 20 m, the dosage of lime from a loop system is advantageous to avoid deposits in the piping system.

When using a hydrated lime suspension (lime milk) special requirements are placed on the particle size distribution and grain size, as these parameters significantly influence the reactivity of the milk of lime. The particle size distribution should be as homogeneous as possible in order to allow the precipitation of calcium carbonate achieved in the reaction with carbon dioxide to proceed efficiently. Can be used in particular a hydrated lime Ca (OH) ₂ , whose homogeneous grain spectrum consists of many small particles, since the reaction rate is essentially influenced by the particle size. Preferably, in the combination of mixing nozzle and fluidic oscillator, a precipitation reaction occurs, for example through the reaction of milk of lime and carbon dioxide, whereby the precipitated calcium carbonate thus produced can be metered into the process stream by means of a further fluid stream (injection stream) or the preferably aqueous phase of the lime milk. By means of the combination of mixing nozzle and fluidic oscillator, the precipitation reaction and the metering into the process stream can take place simultaneously.

It is also advantageous if there is a combination of the respective reaction partners in the combination of mixing nozzle and fluidic oscillator and thus at least one mixing zone is formed, wherein the dwell or reaction time can be adjusted by the geometry of the corresponding zone. In the application of CO ₂ , the execution of a possible combination in the reaction mixing zone can be made of a plurality of bores with a preferably relatively small diameter.

The (primary) precipitation reaction of the calcium carbonate outside the process stream or the constant part of the paper machine preferably takes place in the combination of mixing nozzle and fluid oscillator, so that the process of the precipitation reaction can be influenced by the choice of the injection medium.

When choosing a process water that contains no fiber components, such as filtered filtrate or filtrate or fresh water, calcium carbonate can be provided due to the precipitation reaction in the combination of mixing nozzle and fluidic oscillator, which is dosed into a process stream. When using the pulp suspension itself, for example a partial flow of fluid as the injection stream, the precipitation reaction to the pulp contained in the partial fluid flow can already take place in the combination of mixing nozzle and fluid oscillator. By means of the combination of mixing nozzle and fluidic oscillator, for example, the The following different forms of application of calcium carbonate are provided:

1) The dosage of a precipitated in the combination of mixing nozzle and fluidic oscillator on the fiber of the partial fluid flow calcium carbonate (when using a partial flow of the pulp suspension as an injection stream).

2) dosage of a precipitated calcium carbonate by means of the combination of

Mixing nozzle and fluidic oscillator when using a fiber-free injection stream (filtrate, filtered flotate or fresh water).

3) Use of the lime suspension itself as an injection stream without further fluid and simultaneous reaction of the lime with the CO2 in the mixing (reaction) zone of the combination of mixing zone and fluidic oscillator immediately before dosing.

For example, the pH or other parameters, e.g. the temperature of the injection fluid with respect to reaching optimum precipitation conditions in a mixing zone upstream of the precipitation reaction of the same combination of mixing nozzle and fluidic oscillator can be adjusted.

Advantageously, a reaction of the carbon dioxide and the milk of lime outside the process stream, preferably in a partial stream of the pulp suspension, already takes place in the mixing reaction / nozzle arrangement. The already precipitated in the combination of mixing nozzle and fluidic oscillator on the fibers of the suspension of the partial flow calcium carbonate (primary reaction) is then metered into the process stream. The reaction of the milk of lime and the carbon dioxide in the combination of mixing nozzle and fluidic oscillator can be done much more selectively by changing the mixing conditions, as in the process stream even possible. For example, the bubble size and the number of gas bubbles of the carbon dioxide can be adjusted by means of the bore diameter and the number of holes in the combination of mixing nozzle and fluidic oscillator (mixing zone). During the primary reaction in the combination of mixing nozzle and fluidic oscillator, unreacted milk of lime or unreacted CO2 can then react completely with one another during the secondary reaction in the process stream. Due to the geometry of the communication from the mixing nozzle and the fluidic oscillator, the necessary reaction time can be considerably reduced, so that the actual primary reaction (primary reaction) is completed in less than 3 s, preferably less than 1 s.

By means of the device according to the invention, the precipitation reaction can be controlled by means of the size of the gas bubbles and the efficiency can be increased.

By decomposing into a multi-stage reaction process, the efficiency of the conversion of milk of lime and CO _{2 can be} significantly increased. Furthermore, the homogeneity of the precipitated calcium carbonate can be adjusted by the geometry of the combination of mixing nozzle and fluidic oscillator and the mixing parameters. Thus, the crystal structure of the precipitated calcium carbonate in terms of the required paper properties, for example, in terms of opacity and light scattering and the bulk, etc., can be influenced. By means of a suitably multistage process, moreover, a more uniform distribution of the precipitated calcium carbonate on the pulp is achieved, whereby the optical properties and the retention of the calcium carbonate introduced in this way are considerably improved.

The invention will be explained in more detail below with reference to exemplary embodiments with reference to the drawing; in this show: 1 is a schematic representation of an exemplary embodiment of a fluidic oscillator of a device according to the invention,

2 is a schematic representation of an exemplary arrangement of two fluidic oscillators of a device according to the invention,

Fig. 3 is a schematic representation of an exemplary arrangement of three

4 is a schematic representation of an exemplary embodiment of a device according to the invention with a plurality of circumferentially distributed around the process flow fluid oscillator arrangements,

5 shows a schematic representation of an exemplary combination of a mixing nozzle and a fluidic oscillator of a device according to the invention,

6 shows a schematic illustration of an exemplary embodiment of a mixing nozzle of a device according to the invention, FIG. 7 shows a schematic illustration of a further exemplary embodiment of a mixing nozzle of a device according to the invention,

8 shows a schematic illustration of a further exemplary embodiment of a mixing nozzle of a device according to the invention,

9 is a schematic representation of another exemplary embodiment of a mixing nozzle of a device according to the invention, and

10 shows a schematic illustration of a further exemplary embodiment of a mixing nozzle provided with a shut-off device

Device according to the invention. 1 shows a schematic representation of an exemplary embodiment of a fluidic oscillator 10 of a device according to the invention for metering and mixing at least one fluid medium into a process stream 12 serving in particular for producing a fibrous or nonwoven web (compare also FIG. The fluidic oscillator 10 comprises a nozzle 14, a mixing and / or reaction chamber 16 and return flow channels 18.

The fluidic oscillator 10 is characterized by a self-excited oscillation in its interior, which manifests itself in an oscillating free jet at its outlet 20.

2 shows a schematic representation of an exemplary arrangement 22 of two fluidic oscillators 10 of the device according to the invention, which are arranged relative to each other such that their exit beams 24 are pivoted in orthogonal planes 26, 26 ', here for example in a horizontal and a vertical plane.

3 shows a schematic representation of an exemplary arrangement 22 of three fluidic oscillators 10 for injecting fluid media into the process stream 12, which are arranged relative to one another such that their exit jets 24 are pivoted in three different planes 26, 26 ', 26 ".

4 shows a schematic representation of an exemplary embodiment of the device according to the invention with a plurality of circumferentially distributed around the process stream 12 and a process pipe 12 leading pipe 28 fluid oscillator assemblies 22. The fluid oscillator assemblies 22 in the present case, for example, each two fluidic oscillators 10 for the injection of fluid media in the process stream 12, which are arranged relative to each other so that their exit jets 24 are pivoted in orthogonal planes.

Fig. 5 shows a schematic representation of an exemplary combination of a mixing nozzle 32 and a fluidic oscillator 10 of the device according to the invention. The fluidic oscillator 10 has the same structure as the fluidic oscillator already described with reference to FIG. 1, wherein like reference numerals are assigned to corresponding parts. The mixing nozzle 32 essentially comprises two nozzles 34, 36, which inject a first fluid 1 and a second fluid 3 into the fluidic oscillator 10. As can be seen with reference to FIG. 5, the outlet openings of the two nozzles 34, 36 are in the present case, for example, in a plane, wherein the outlet opening of the nozzle 36 is located within the outlet opening of the nozzle 34.

Fig. 6 shows in a schematic representation again a mixing nozzle 32 of the type, as has already been described with reference to FIG. 5. Corresponding parts are assigned the same reference numerals. The transition region to the (not shown here), the fluidic oscillator 10 is designated in the present illustration with 38.

For example, in the present embodiment, the first fluid 1 may be a partial fluid flow and the second fluid 3 may be, for example, a chemical dosing flow. 7 shows a schematic representation of another exemplary embodiment of a mixing nozzle 32 of the device according to the invention, which differs from the mixing nozzle 32 shown in FIG. 6 only in that the nozzle 36 for the second fluid 3 passes through the nozzle opening of the nozzle 34 extends into the (not shown), the fluidic oscillator 10. Corresponding parts are assigned the same reference numerals.

Fig. 8 shows a schematic representation of another exemplary embodiment of a mixing nozzle of the device according to the invention, in addition to the nozzles 34 and 36 for injection of the fluid formed for example by a Partialfluidstrom 1 and the example formed by a chemical dosing Fluid 3 in the (not shown) the fluidic oscillator 10 further nozzles 40, 42 for injecting a further fluid formed for example by a Partialfluidstrom 2 or a further example formed by a chemical stream 4 further fluid 4 in the fluidic oscillator 10 includes. In this case, the outlet openings of all the nozzles 34, 36, 40, 42 lie in a plane in the region of the transition to the fluidic oscillator 10.

9 shows a schematic representation of another exemplary embodiment of a mixing nozzle 32, which differs substantially from the mixing nozzle 32 described with reference to FIG. 8 only in that the nozzles 36 and 42 extend beyond the plane of the transition 38 into the fluid oscillator 10 into it. Corresponding parts are assigned the same reference numerals.

10 shows a schematic representation of another exemplary embodiment of a mixing nozzle 32 of the device according to the invention.

The mixing nozzle 32 comprises a first flow channel 44, a second flow channel 46, which surrounds the first flow channel in an annular manner, and a third flow channel 48, which surrounds the second flow channel 46 in an annular manner. The inner flow channel 44 extends through the outlet opening of the flow channel 46 into a mixing chamber 50 in which the fluids supplied via the flow channels 44 to 48 are premixed prior to injection into the fluidic oscillator 10. For example, a mixture of a chemical, e.g. two other fluids are premixed in at least one mixing chamber 50 and the mixture is then injected into the fluidic oscillator 10 and a fluidic oscillator assembly 22, respectively.

Further conceivable mixing nozzles are described, for example, in DE 10 2010 028 572 A1. LIST OF REFERENCE NUMBERS

1 fluid, partial fluid flow

2 fluid, partial fluid flow

3 fluid, chemical dosing flow

4 fluid, chemical flow

10 fluidic oscillator

12 process stream

14 nozzle

16 mixing and / or reaction chamber

18 return flow channel

20 outlet

22 fluidic oscillator arrangement

24 exit jet

26 level

26 'level

26 "level

28 pipe

30 combination

32 mixing nozzle

34 nozzle

36 nozzle

38 transition

40 nozzle

42 nozzle

44 first flow channel

46 second flow channel

48 third flow channel

50 mixing chamber

52 shut-off device

Claims

claims

1. A method for metering and mixing at least one fluid medium in a particular the production of a fibrous or nonwoven web serving process stream (12), wherein at least one fluid medium via a fluidic oscillator (10) is injected into the process stream (12).

2. The method according to claim 1,

In this way, at least one fluid medium injected into the process stream (12) via a fluidic oscillator (10) contains at least one chemical.

3. The method according to claim 1 or 2,

characterized in that at least one arrangement (22) of at least two fluidic oscillators (10) fluid media are injected into the process stream (12), wherein the fluidic oscillators (10) of a respective fluidic oscillator arrangement (22) are preferably arranged relative to each other in that its exit jets (24) are pivoted in different planes (26, 26 ', 26 ").

4. The method according to claim 3,

characterized in that via at least one arrangement (22) of two fluidic oscillators (10) fluid media are injected into the process stream (12), which are arranged relative to each other so that their exit beams (24) in orthogonal planes (26, 26 ') be pivoted.

5. The method according to claim 3,

characterized in that at least one arrangement (22) of more than two fluidic oscillators (10) fluid media in the process stream (12) are injected (24), which are preferably arranged relative to each other so that their exit beams (24) in different planes (26, 26 ', 26 ") are pivoted.

6. The method according to at least one of the preceding claims,

This means that fluid media are injected into the process stream (12) via a plurality of fluid oscillators (10) distributed in the circumferential direction around the process flow (12) and / or fluid oscillator arrangements from a plurality of fluid oscillators (10).

7. The method according to at least one of the preceding claims,

In this way, at least one fluid medium is injected into the process stream (12) via a combination (30) from a mixing nozzle (32) and at least one fluid oscillator (10).

8. The method according to claim 7,

in that the mixing nozzle (32) is connected upstream of the fluidic oscillator (10).

9. The method according to claim 7 or 8,

In this way, at least two fluids are fed to the mixing nozzle (32) and mixed and / or reacted with one another in the mixing nozzle (32).

10. An apparatus for metering and mixing at least one fluid medium in a particular of the production of a fibrous or nonwoven web serving process stream (12), in particular for carrying out the method according to any one of the preceding claims, with at least one fluidic oscillator (10) for injection at least one fluid medium in the process stream (12).

11. The device according to claim 10,

Thereby, at least one fluidic oscillator (10) serves to inject a fluid medium into the process stream (12) which contains at least one chemical.

12. Device according to claim 10 or 11,

characterized in that the device comprises at least one arrangement (22) of at least two fluidic oscillators (10) for injecting fluid media into the process stream (12), which are preferably arranged relative to each other so that their exit jets (24) at different levels ( 26, 26 ', 26 ") are pivoted.

13. Device according to claim 12,

characterized in that the device comprises at least one arrangement (22) of two fluidic oscillators (10) for injecting fluid media into the process stream (12) which are arranged relative to one another such that their exit beams (24) are arranged in orthogonal planes (26, 26). 26 ') are pivoted.

14. The device according to claim 12,

characterized in that the device comprises at least one arrangement (22) of more than two fluidic oscillators (10) for injecting fluid media into the process stream (12), which are preferably arranged relative to each other so that their exit jets (24) in different planes (26, 26 ', 26 ") are pivoted.

15. Device according to one of claims 10 to 14,

characterized in that the device comprises a plurality of circumferentially around the process stream (12) distributed fluid oscillators (10) and / or fluid oscillator assemblies (22) from a plurality of fluidic oscillators (10) for the injection of fluid media in the process stream (12).

16. Device according to one of claims 1 to 10,

in that it comprises at least one combination of a mixing nozzle (32) and at least one fluidic oscillator (10) for injecting a fluid medium into the process stream (12).

17. Device according to claim 16,

Thereby, the mixing nozzle (32) is connected in series with the fluidic oscillator (10).

18. Device according to claim 16 or 17,

in that at least two fluids can be supplied to the mixing nozzle (32) and can be mixed with one another and / or reacted with one another in the mixing nozzle (32).

19. Use of a method according to any one of claims 1 to 9, in particular according to one of claims 7 to 9, for carrying out a precipitation reaction for the formation of calcium carbonate and dosage of the precipitated calcium carbonate in the process stream (12).

20. Use of a device according to one of claims 10 to 18, in particular according to one of claims 16 to 18, for carrying out a precipitation reaction for the formation of calcium carbonate and dosage of the precipitated calcium carbonate in the process stream (12).