EP2408545A1

EP2408545A1 - Cascade-type coating device for powdery material and associated method

Info

Publication number: EP2408545A1
Application number: EP10709839A
Authority: EP
Inventors: Heinz Meier; Christian Buerge; Beat Schnider
Original assignee: Sika Technology AG
Current assignee: Sika Technology AG
Priority date: 2009-03-19
Filing date: 2010-03-19
Publication date: 2012-01-25
Also published as: EP2230004A1; MX2011009827A; BRPI1009463A2; WO2010106154A1; CN102355941A; US20120058265A1

Abstract

The invention relates to a device (1) for coating powdery material (2) with at least one liquid additive (3). Said device (1) comprises an introduction device (6) which comprises a supply line (7) and at least two nozzles (8) which can introduce the liquid additive (3) onto the conveyor line (5) and to the powdery material (2). Said outlet openings (9) of the at least two nozzles (8) are housed at a distance of between 0.5 - 10 m on the supply line (5). The invention also relates to a method for coating powdery material (2) with at least one liquid additive (3) and to the use of a device (1) for coating powdery material (2) with at least one liquid additive (3).

Description

Cascade-type coating apparatus for powder-form material and method for the same

TECHNICAL FIELD The invention relates to a device for treating, in particular coating, pulverulent material with at least one liquid additive. The device comprises a conveying device, which contains at least one conveying line, through which the powdered material is conveyed, and at least one introduction device for introducing the liquid additive into the at least one conveying line according to the preamble of the first claim.

Furthermore, the invention relates to a method for treating powdered material with at least one liquid additive and to a use of a device for treating powdery material with at least one liquid additive according to the preambles of the further independent claims.

State of the art

The material cement is usually obtained from cement clinker. Here, the cement clinker, the precursor of the cement rotary kiln, ground to cement powder, then mixed with gypsum, which acts as a setting regulator, resulting in the mixing process, the final product cement. The recovered cement is stored in silos after production. For further processing into concrete, the material cement is mixed with aggregates, chemical additives and water. The addition of the additives should improve the properties of the concrete in chemical and / or physical terms. For example, the additives can influence the flow properties, the viscosity, the compression behavior and the setting behavior of the concrete. The addition of liquid additive during the

Further processing, especially during production, is difficult, since the pulverulent materials required for producing the concrete, in particular their dust, can react with the liquid additive and by contamination of the conveyor affect the promotion of the powdered material. This can occur especially when a too large amount of additive is added locally or the additive contaminates the conveyor, which can lead to clogging and failure of the promotion of the powdery material.

The reaction of the powdery materials, in particular their dust, with the liquid additive can further affect the contamination of the introduction device, the introduction of the liquid additive. Especially in the case of pneumatic conveying or conveying in

Air conveying troughs of the powdery materials required for the production of the concrete typically have high dust concentrations and / or high temperatures, which is particularly conducive to the formation of the previously mentioned contaminants. A reliable and controllable introduction of the liquid

Additives and a homogeneous distribution of the liquid additive on the powdery material are important for the quality of the final product and the trouble-free flow of the treatment process.

Presentation of the invention

Object of the present invention is therefore to ensure a controlled, reliable and constant treatment of the powdery material with liquid additive in a device of the type mentioned.

According to the invention this is achieved by the features of the first claim.

The core of the invention is therefore that the introduction device 6 of the device 1 comprises a supply line 7 and at least two nozzles 8, about which the liquid additive 3 in the delivery line 5 and the powdery

Material 2 is inserted, wherein the outlet openings 9 of the at least two

Nozzle 8, measured at a distance of 0.5 to 10 m, in particular 1 to 5 m in the conveying direction of the powdery material 2, are attached to the conveying line 5.

The advantages of the invention can be seen, inter alia, in the fact that the arrangement of the outlet openings 9 of the at least two nozzles 8 at a distance of 0.5 - 1 O m, a local supersaturation with liquid additive 3 in the delivery line 5 can be prevented. Among other things, thereby the flow rate of the liquid additive can be distributed to a plurality of nozzles 8 and by the distance of the outlet openings 9 from each other, the addition of liquid additive can be distributed over a larger area in the delivery line.

It is particularly expedient if the device 1 has means 10 for determining the flow rate FI _{FZ of} the liquid additive 3 and means 11 for determining the delivery pressure P _{FZ of} the liquid admixture 3 and optionally means 12 for determining the flow rate FI _{PM of} the powdery material 2 , An increase in the delivery pressure P _FZ can indicate, for example, a blockage in the introduction device 6 or an increase in the flow rate FI _F z due to an increase in the flow rate FI _{PM of} the powdery material 2.

Therefore, upon reaching a defined upper delivery pressure P _{FZ O} compared to normal or optimal operation another nozzle 8 are switched on (cascade), whereupon the delivery pressure P _F z falls back into the normal value range P _F z _opt thanks to the larger outlet area and the Spray pattern stays in a safe area. This means, among other things, that, for example, a desired flat jet does not emerge as a bundled jet or an uncontrolled spray pattern. Conversely, it works in case of drop in the delivery pressure P _F z analog. The conveying of liquid additive within a normal value range P _{FZ op} t is advantageous in that the nozzle, in particular when it concerns flat jet nozzles, have a pressure range, respectively flow range, in which an optimal spray pattern is ensured. Outside of P _{FZ opt} , for example, contamination of the conveying device or of the nozzles may occur or local supersaturation with liquid additive 3 in the conveying line 5. This would be a controllable introduction of liquid additive and a homogeneous distribution of the liquid additive on the powdery material not useful.

Addition of the liquid admixture 3 alone based on a determination of the flow rate FI _{FZ of} the liquid admixture (more flow requires more open nozzles) would also be conceivable, but would neither account for the pressure increase in the case of clogging nor the conveying of the nozzles in their advantageous pressure range , In addition, the delivery pressure P _{FZ could increase} so much that the introduction device would be damaged and the treatment of the powdery material with liquid additive would come to a standstill.

It is also advantageous if the device 1 comprises at least one mixing device 14, which mixes the mixture of powdered material 2 and liquid additive 3. This is particularly beneficial to the homogeneous distribution of the liquid additive to the powdery material. When the mixing device 14 actively moves the powdery material 2 in the conveying direction of the powdery material 2, in particular blockages of the conveying line 5 can be prevented or respectively dissolved.

It is also expedient if at least one of the nozzles 8 is movable, in particular rotatable relative to the axis of the outlet direction of the liquid additive 3. On the one hand, by a rotation of the nozzle to the axis of the discharge direction, in particular when it is a nozzle with a spray pattern with elliptical or rectangular impact surface 16, the spray pattern of the flow rate FI _FZ and / or the delivery pressure P _F z, in particular the delivery pressure P _FZ , of the liquid admixture 3.

However, the at least one nozzle 8 can also be movably arranged in and out of the delivery line 5. This is among other things the prevention of contamination of the nozzle 8 conducive, since thereby the nozzles, in particular the outlet opening 9, are protected from the dust 17 of the powdery material 2. Furthermore, nozzles outside of the delivery line 5 can thereby be cleaned by a cleaning device 18, which improves the structural design of the cleaning environment. Furthermore, unused nozzles outside the delivery line can be protected from the dust 17. Both variants increase the flexibility of the device 1 over the amount and viscosity of the liquid additive 3. Further aspects of the invention are the subject of further independent claims. Particularly preferred embodiments of the invention are the subject of the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS Exemplary embodiments of the invention will be explained in more detail below with reference to the drawings. The same elements are provided in the various figures with the same reference numerals. The flow direction of the media is indicated by arrows.

Show it:

Fig. 1 is a schematic representation of a

Embodiment;

Figure 2 is a schematic representation of a plan view of possible positions of impact surfaces of liquid additive.

Fig. 3 a - b representations of a possible mixing device; Fig. 4 is a further schematic representation of a

Embodiment.

Only the elements essential for the immediate understanding of the invention are shown.

FIG. 1 shows the schematic structure of a device 1 for the purpose of the invention

Treating, in particular coating, of pul deformed material 2 with at least one liquid additive 3 shown. The device 1 comprises at least one conveying device 4, which has at least one conveying line 5 contains, through which the powdery material 2 is conveyed, and at least one introduction device 6 for introducing the liquid additive 3 in the at least one delivery line comprising the powdery material 2. The introduction device 6 comprises a supply line 7 and at least two nozzles 8, about which the liquid additive 3 in the conveying line 5 and the powdery material 2 is inserted, wherein the outlet openings 9 of the at least two nozzles 8, at a distance of 0.5 - 10 m, in particular 1-5 m, measured in the conveying direction of the powdery material 2, on the conveying line. 5 are attached. It is advantageous if the device comprises at least three nozzles 8. By at least two, in particular at least three nozzles, the device can ensure the treatment of powdered material 2 with at least one liquid additive 3 in a wider range of flow rate FI _FZ . By "powdered material" is meant in this document a material which is obtained by breaking up a dry solid, for example by crushing, grinding, crushing or milling in mills, or by spray-drying.

According to the grain size, a rough classification of the powdery materials is possible; a more accurate classification of powdered materials is carried out, for example, by their bulk density and sieve analysis.

Advantageously, the powdery materials, especially in pneumatic transport, a flow behavior that is reminiscent of liquids. Typically, the powdery materials 2 have a particle size of essentially 1 to 200 μm, preferably 3 to 30 μm and / or a fineness of Blaine of 2,000 to 8,000 cm ² / g, preferably 3,000.

6000 cm ² / g.

As a powdery material 2 are non-hydraulic, hydraulic and latent hydraulic powder material of all kinds, preferably such, which is needed for the construction industry in large quantities.

In addition, all materials which are used for the production of concrete, mortar or gypsum are suitable as powdery materials 2, in principle in particular cement particles. It is also possible to use substances or additives, such as, for example, silica fume, fly ash, light aggregate, slag, fiber matehalia, for example organic and polypropylene fibers, etc., or inorganic materials such as basalt, glass, etc. It should be stressed that it is possible in principle to use all the substances that are necessary for the

Preparation of concrete, mortar or plaster can be used to treat with liquid additive 3, in particular to coat. The treatment of the powdery material may advantageously be carried out where the pulverulent materials are conveyed pneumatically. This means that the treatment process does not necessarily have to take place during the production of the concrete, mortar or gypsum. The raw materials can therefore already be treated at the place of their production. For example, the cement particles can be treated directly at the end of the cement production process. The powdery material 2 preferably comprises at least one

A binder, which is preferably selected from the group consisting of cement, mortar, gypsum, silica, fly ash, slag and blast furnace slag or a mixture thereof.

Particularly preferably, the powdery material 2 is cement.

As liquid admixture 3 are typically suitable substances which can be atomized and / or dropletized and / or vaporized and have a viscosity of 1-500 mPa * s.

For example, here are not some final liquid additives, from whose name usually the effect is listed: Concrete plasticizers, flow agents, air entrainers, (reaction) retarders, accelerators, such as solidification and hardening accelerators, stabilizers, chromate reducers, Einpresshilfen, foaming agents, air entraining agents, sealants , Corrosion inhibitor and recycling aids. The at least one liquid additive 3 is typically selected from the group consisting of dispersant, condenser, flow agent, retarder, accelerator, stabilizer, shrinkage reducer, air entraining agent and corrosion inhibitor or a mixture thereof. It is particularly advantageous as a liquid additive a

High performance concrete liquefier, preferably the product ViscoCrete®

Company Sika, to use. This high-performance concrete condenser reduces the water content of cement and improves the workability of the concrete.

The conveying device 4, which contains at least one conveying line 5, through which the powdery material 2 is conveyed, is typically a conveying device in the construction industry. Such a conveyor device 4 is used, for example, for transporting the production of the powdery material 2 to an intermediate storage, such as an intermediate silo, to a mobile means of transport, such as a truck or railway wagon, or a repository. The conveying of the pulverulent material 2 in a conveying line 5 is generally carried out by means of bucket elevators, conveyor belts, pneumatic or in so-called air conveyor troughs, also called "air slides." Such air troughs are commercially available, for example, from Mahr GmbH, Germany typically of rectangular steel tubes having a width of 10-100 cm and a height of 10-100 cm, the powdery material 2 has, during conveyance, therein a filling level of typically% by% of the area provided for the powdered material Material 2 in an air conveyor trough is based on the fluidization of the powdered material by air, as well as the inclination of the trough of 5 to 10 °, which together with the kinetic energy which brings the powdery material in entering the air conveyor trough, allows movement of the powdery material t.

The fluidization is done by flowing with air from below through the located on a perforated substrate powdery material, whereby the particles of the powdery material remain within the resulting fluidized bed in a continuous up and down movement and so to speak remain in limbo. The separation of Fluidisierluft and the powdery material is carried out by a release fabric made of plastic or glass fibers, wherein the fluidizing air can pass through the tissue, the powdered material 2 to be delivered but not. In the delivery line 5 often prevail temperatures of up to 120 ⁰ C, further forms above the powdery material 2 dust 17 of powdery material.

The term "dust" in the present document is understood to mean the unwanted disperse distributions of solids, in particular of pulverulent material 2, in gases produced by mechanical processes or by fluidization, in particular by transport in the conveying line 5, the solid substance being in the ambient air is dispersed within the conveying line 5

Preferably, the delivery line 5 is an air conveyor trough. Typically, the powdery material 2 is transported through the conveying line 5 at a constant speed of about 0.5-10 m / s.

The introduction device 6 for introducing the liquid admixture 3 into the at least one delivery line 5 comprises a supply line 7 and at least two nozzles 8. Via at least one nozzle, the liquid admixture 3 can be introduced into the delivery line 5 and to the powdery material 2.

The liquid additive 3 can, for example, be atomized (aerosol) and / or dripped (drops) and / or vaporized (steam). Due to the different consistency, the coating thickness of the powdery material can be adjusted with the liquid additive.

Via the supply line 7, the liquid additive 3 is typically conducted to the at least two nozzles 8 at a pressure of 1-15 bar, preferably 3-7 bar. Typically, the pressure of the supply line is greater than or equal to, in particular greater than the nominal pressure of the nozzles. Advantageously, the introduction device 6 to a pump for conveying the liquid additive 3, and at least one valve 19 in front of at least one nozzle 8. Typically, the supply line 7 consists of a main supply line 71 and Sub-leads 72, which connect the main lead 71 with the nozzles 8.

Suitable nozzles 8 allow, inter alia, the spraying of liquid additive 3 at pressures of 1 to 30 bar, preferably 3 to 7 bar. Typically, these are flat jet nozzles, mist nozzles or two-component nozzles, in particular flat-jet nozzles.

Fog nozzles are advantageous in that they can atomize pressurized liquids into very fine droplets with a large specific surface area.

Two-substance nozzles are characterized by a very fine atomization by the mixing of liquids with air or gas. Further, they can produce various spray patterns, such as flat jet, hollow cone or full cone spray patterns. Flat jet nozzles are characterized by a uniform liquid and pressure distribution. Furthermore, they allow a great variability in the choice of the spray angle. Particularly suitable nozzles have a spray angle of 30 ° - 120 °. Depending on the design of the outlet opening 9 of the nozzle, an elliptical or rectangular impact surface 16 is possible. Flat jet nozzles are inexpensive and allow by a defined and easily adjustable impact surface 16 targeted treatment of the pul deformed material 2 with the liquid additive 3. This is to the effect that thereby the contact of the liquid additive 3 with the delivery line 5, in particular the walls and if it is an air conveyor trough, the separating fabric, can be avoided. This reduces the risk of blocking the delivery of the powdery material 2 in that either the fluidization of the powdery material 2 is restricted or the powdery material settles on the walls and clumps. Typically, the at least two nozzles 8 have one

Nozzle bore of 0.1 - 1 mm.

The nozzles 8 are typically arranged on the conveying line 5, that the liquid additive 3 as uniform as possible with a possible large part of the powdery material 2 can be brought into contact. Typically, the nozzles are arranged on the powder material 2 opposite wall of the delivery line. It is also advantageous if the nozzles, in particular the outlet opening 9, in the conveying line 5 have the largest possible distance to the powdery material 2. On the one hand, this allows a greater flexibility in the treatment with the liquid additive 3, on the other hand, the nozzles are less exposed to the dust 17 of the powdery material 2, whereby the possibility of contamination of the nozzles is reduced. The distance between the outlet opening 9 of the nozzle 8 and the powdery material 2 is typically dependent on the filling level of the powdery material 2, the shape of the cross section of the conveying line and the spraying angle of the nozzle.

The outlet opening 9 does not necessarily have to be circular disk-shaped, but may have other cross-sectional geometries; in particular, it may, for. B. be formed as an elongated slot whose length is a multiple of its height. The exit direction of the liquid additive 3 when leaving the nozzle does not necessarily have to be identical to the direction of the nozzle axis. It is also expedient if at least one of the nozzles 8 is movable, in particular rotatable relative to the axis of the outlet direction of the liquid additive 3. On the one hand, the spray pattern of the flow rate FI _FZ and / or the delivery pressure P _{FZ of} the liquid admixture 3 can be adjusted by rotation of the nozzle to the axis of the discharge direction, in particular if it is a nozzle with a spray pattern with an elliptical or rectangular impact surface 16. This is shown schematically in FIG. FIG. 2 is a plan view of the powdery material 2 transported in the conveying line 5 and shows possible positions of impact surfaces 16. If the impact surface 16 of the smaller impact surface 161 is enlarged, for example by increasing the flow rate FI _FZ and / or the delivery pressure P _F z, the spraying of the outer region 20 can be prevented by the larger impact surface 162 by rotation of the nozzle to the axis of the exit direction. This can cause pollution the outer region 20, for example, the delivery line 5, in particular the walls and, if it is an air conveyor trough, the release fabric, be avoided. Furthermore, the addition of the liquid additive 3 can be distributed over a larger area in the delivery line. Preferably, the rotatability of the at least one nozzle to the axis of the outlet direction of the liquid additive 3 by a control system 13 is adjustable.

Typically, at least one of the at least two nozzles conveys the liquid additive 3 into the conveying line 5 and to the powdered material 2. It is particularly advantageous if the device 1 has at least two nozzles in normal operation, which convey the liquid additive 3 into the conveying line 5 and a nozzle which does not deliver a liquid additive. As a result, the device 1 can react accordingly both upon reaching a defined upper delivery pressure P _F compared to normal or optimum operation and also with a drop in the delivery pressure P _FZ and ensure the promotion in the normal value range P _F z _oPt .

However, the at least one nozzle 8 can also be movably arranged in and out of the delivery line 5. This is among other things the prevention of contamination of the nozzle 8 conducive, since thereby the nozzles, in particular the outlet opening 9, are protected from the dust 17 of the powdery material 2. Furthermore, nozzles outside of the delivery line 5 can thereby be cleaned by a cleaning device 18, which improves the cleaning environment. Furthermore, unused nozzles outside the delivery line can be protected from the dust 17. Preferably, the movement of the at least one nozzle into the delivery line 5 in or out by a control system 13 is adjustable.

The mobility of the nozzles 8 allows a higher flexibility of the device 1 with respect to the flow rate FI _F z and the delivery pressure P _FZ , thereby, for example, liquid additives can be used over a wider viscosity range. Of course, nozzles can both mobility, in the delivery line 5 in and out and rotatable to the axis of the exit direction of the liquid additive 3, have. It is also advantageous if the device 1 has at least one cleaning device 18 for cleaning the introduction device 6. The cleaning device 18 may comprise a means for cleaning the introduction device 6, which is selected from the group consisting of sieve, solvent, compressed air, mechanical tool and ultrasound. Further, the cleaning device 18 parts or the entire introduction device 6 as needed and / or time permanently or at regular intervals clean and it may be advantageous if the cleaning device 18 is regulated by a control system 13. The cleaning device 18 may be further arranged inside or outside the delivery line 5. It may of course be used on a combination of the mentioned means and be advantageous.

It is also advantageous if the device 1 comprises at least one mixing device 14, which mixes the mixture of powdered material 2 and liquid additive 3.

As a mixing device 14 are typically devices that can mix the powdery material 2 and the liquid additive 3 to a fully or partially mixed common flow stream.

Typically, the mixing device 14 is arranged, at least partially, in the delivery line 5.

The mixing device 14 may be a static one

Mixing device, in which the mixing takes place by repeated division of the Mateπaistroms 21, as well as a dynamic mixing device in which the Mateπaistrorn by means of a moving element multiply divided or even vortexed act under the term "Mateπaislrom" in the present document powderforrπiges material 2 in the Forderleitung 5 and additionally, if present, liquid Zusatzmitlei 3 in conjunction mil puiverformigem Mateπai understood

As a static mixing devices, for example, devices are suitable, which have molded parts, which the material flow 21 in the Conveying line 5 can be mixed by multiple parts, distracting and merging. For example, the moldings pflugscharähnliche mixing tools whose size, arrangement, peripheral speed and geometric shape are sized and matched to each other that they are able to mix the material flow 21 optimally.

Further, molded parts in a spiral shape or helices are advantageous, which can cause a rotation reversal and flow division in the material flow and thereby ensure a good and continuous mixing. Static mixers are advantageous in that they require little maintenance, typically slow down the flow of material, and require no external power.

For example, screw mixers are suitable as dynamic mixing devices. The shaping of the screw conveyor, for example a simple, interrupted or opposite screw conveyor, gives the material flow 21 a swirling, three-dimensional movement. In this case, the bringing together of the powdery material and the liquid additive by pushing movements along the delivery line 5 and in the material flow 21 itself.

Further, as dynamic mixing devices in the conveying line 5 arranged homogenizers are suitable, which work with pumping action.

As dynamic mixing devices, a wobble element 141 is also suitable, as shown in FIGS. 3a and 3b. The tumble element 141 may be partially or completely located in the material flow 21. In Figure 3a, the flow direction of the material flow 21 is shown by a straight arrow. Typically, the wobble member includes one or more disc-like mold members 142 which are coupled to the wobble member axis 143 so as to wobble vertically with respect to the wobble member axis upon rotation of the wobble member axis. Typically, the at least one disc-like shaped part is fixedly arranged on the wobble axis 143 in such a way that the disc-like shaped part is inclined relative to the vertical axis 144 of the wobble element axis 2 ° -20 ° is. A possible inclination 145 of the disc-like shaped part with respect to the vertical axis 144 of the wobble element axis 143 is shown in FIG. 3b. The disk-like moldings are typically circular metal plates. The tumble element axis is typically arranged substantially horizontally to the flow direction of the powdery material 2 in the delivery line 5. The tumbling motion of the disk-shaped moldings to the direction of flow of the powdery material 2 is to ensure a good and continuous mixing.

The rotation of the disk-like shaped parts about the wobble element axis is advantageously so fast that powdery material 2 experiences an acceleration in the direction of the conveying direction of the powdery material in contact with the disk-like shaped part.

The advantage of the dynamic mixing devices is that, in addition to the mixing process, they also actively move the powdery material 2 in the conveying direction of the powdered material. This can be for

Prevention and / or elimination of blockages, in particular by

Clumping of pul deformed material, are used in the delivery line.

The mixing device 14 is in particular a

Mixing device, which actively moves the powdery material 2 in the conveying direction of the powdery material 2. Preferably, the mixing device 14 is a tumbling element.

The mixing device 14 may further be a mechanical or a pneumatic mixing device.

In pneumatic mixing devices are preferably mixing devices, which comprises at least one mixing nozzle 15 through which a gas, in particular air, can be blown into the mixture of powdered material 2 and liquid additive 3. The gas jet generated by the mixing nozzle 15 generates the necessary mixing movements in the material flow 21. The advantage of the pneumatic mixing devices is that they are easy to control and that they have no mechanically moving parts. It is particularly useful when the device 1 means 10 for

Determining the flow rate FI _{FZ of} the liquid additive 3, for example a flow meter, and means 11 for determining the

Delivery pressure P _{FZ of} the liquid additive 3, for example, a pressure gauge having.

Furthermore, it is advantageous if the device 1 has means 12 for determining the flow rate FI _{PM of} the pulverulent material 2, for example a flow meter for pulverulent media.

The determination of the flow rate FI _{PM of} the powdery material 2 can be carried out empirically or technically.

The device 1 may further include at least one control system 13, which has as a measured variable the flow rate FI _F z of the liquid additive 3 and / or the delivery pressure P _F z of the liquid additive and / or the flow rate FI _{PM of} the powdery material 2.

Advantageously, the control system 13 as a measured variable to the delivery pressure P _F z of the liquid additive.

It is particularly expedient if the control system 13 can switch on or off at least one nozzle 8 as a controlled variable and / or can connect or disconnect at least one cleaning device as a controlled variable.

The mass ratio of added liquid additive 3 to powdery material 2 is typically 1:10 - 1: 1000, in particular from 1: 100 - 1: 500. Further, it is advantageous if the control system 13 means 10 for

Determining the flow rate FI _F z of the liquid additive 3, for example a flow meter, and means 11 for determining the delivery pressure P _F z of the liquid additive 3, for example, a pressure gauge having. Further, it is advantageous if the control system 13 means 12 for

Determining the flow rate FI _{PM of} the powdery material 2, for example, a flow meter for powdered media having. By determining a maximum delivery pressure P _F z _{max of} the liquid

Additive 3 and switching off the promotion of the liquid additive upon reaching the maximum delivery pressure P _FZ max, for example by a

Blockage in the main lead 71, damage to the insertion device 6 can be prevented.

Deviations of the delivery rate of the liquid admixture 3, for example due to contamination, can be compensated by changing the delivery pressure P _FZ , in particular in conjunction with corresponding rotation of the nozzles to the axis of the discharge direction of the liquid additive, and / or by switching on or off of nozzles 8.

The control system 13 can in particular have the use of the cleaning devices 18 and / or the use of the mixing devices 14 as a controlled variable. It is particularly advantageous if the control system 13 has as control variables the mentioned devices and a rotation of the nozzles to the axis of the discharge direction of the liquid additive and a connection or disconnection of nozzles.

FIG. 4 schematically shows an example of a device 1. Powdery material 2 is conveyed through the conveying line 5 of the conveying device 4, and liquid additive 3 is sprayed via the introduction device 6 into the conveying line 5 via nozzles 8. The apparatus further comprises a means 12 for determining the flow rate FI _{PM of} the powdery material 2. Furthermore, mixing devices 14 are located in the delivery line 5, which are located at least partially in the material flow 21 of the powdery material. The mixers are tumble elements as previously described.

The introduction device 6 comprises a feed line 7 consisting of a main feed line 71 and secondary feed lines 72 and four nozzles 8, of which the outlet openings 9 of three nozzles are arranged in the feed line 5 and deliver liquid additive and a nozzle no liquid additive promotes and is located outside the conveyor line 5 for protection from the dust 17. The four nozzles are nozzles which can be moved into and out of the delivery line 5 and are rotatable with respect to the axis of the discharge direction of the liquid additive 3. Both mobilities are controlled variables of a control system 13.

The device further comprises means 10 for determining the flow rate FI _F z of the liquid additive 3 and the delivery pressure PFZ 11 of the liquid additive. The secondary lines 72 further have a 1-way valve 22, in particular a 1-way valves with two switching positions, which can be electrically operated on. The control system 13 can thereby turn on or off the promotion of individual nozzles.

Furthermore, the invention comprises a method for treating, in particular coating, powdery material 2 with at least one liquid additive 3, wherein the liquid additive 3 is brought into contact with the powdery material 2 via a previously described device 1.

In particular, the method comprises the steps: a. Conveying a powdery material 2 through a

Delivery line 5; b. Spraying the powdery material 2 with at least one liquid additive 3 in an amount which is proportional to the flow rate FI _{PM of} the powdery material.

Furthermore, it may be advantageous if the method additionally comprises the following step: c. Determining the flow rate FI _{PM of} the powdery material 2 and / or determining at least one delivery parameter FP _{FZ of} the liquid additive 3, wherein FP _F z the two

Parameter flow rate FI _F z of the liquid additive 3 and delivery pressure P _F z of the liquid additive 3 comprises. Preferably, the step comprises determining the flow rate FI _{PM of} the powdery material 2, determining the flow rate FI _{FZ of} the liquid additive 3 and determining the delivery pressure P _{FZ of} the liquid additive 3.

It is advantageous if the method additionally comprises at least one of the following steps: d. Turning on or off at least one nozzle 8, via which the powdery material 2 is sprayed with at least one liquid additive 3, if at least one

Delivery parameter FP _{FZ of} the liquid additive 3 falls below a limit FP _F z min or exceeds a limit FP _F z max, especially if the delivery pressure P _F z of the liquid additive 3 exceeds a limit P _{FZ max} ; and / or e. Turning at least one nozzle to the axis of the discharge direction of the liquid additive 3 if at least one delivery parameter FP _FZ of the liquid additive 3 falls below a limit FP _FZ min or exceeds a limit FP _FZ max, especially if the delivery pressure P _{FZ of} the liquid additive 3 a limit P _F zmax exceeds.

It is advantageous if the method additionally comprises at least the following step: f. Mixing the mixture of powdered material 2 and liquid additive 3 by a mixing device 14th

Furthermore, it is advantageous if the method additionally comprises at least the following step: g. Disable the promotion of the liquid additive 3 at

Reaching a maximum delivery pressure P _F zmax. It is also advantageous if the method additionally comprises at least the following step: h. Cleaning of parts or the whole insertion device 6 by a cleaning device 18. The advantages of the additional steps have been described above.

Furthermore, the invention comprises the use of a device 1, as described above, for treating, in particular coating, powdery material 2 with at least one liquid additive 3.

Of course, the invention is not limited to the embodiments shown and described.

LIST OF REFERENCE NUMBERS

1 device

2 Powdery material 3 Liquid additive

4 conveyor

5 support line

6 introduction device

7 Supply line 71 Main supply line

72 secondary line

8 nozzle

9 outlet opening

10 means for determining the flow rate FI _F z of the liquid additive

11 means for determining the delivery pressure P _{FZ of} the liquid additive 12 means for determining the flow rate FI _{PM of} the powdered material

13 control system

14 mixing device 141 wobble element

142 Disc-shaped molding

143 wobble element axis

144 vertical axis of the wobble element axis 143

145 inclination of the disc-like molding with respect to the vertical axis 144th

15 mixing nozzle

16 impact surface

161 Smaller impact area

162 Greater impact area 17 Dust of the powdery material

18 cleaning device

19 valve

20 Exterior impact area

21 Material flow 22 1-way valve

Claims

claims

1. Device (1) for treating, in particular coating, of powdery material (2) with at least one liquid

An additive (3) comprising a conveying device (4), which contains at least one conveying line (5), through which the powdery material (2) is conveyed, and at least one introduction device (6) for introducing the liquid additive (3) into the at least one Delivery line (5) comprising the powdery

Material (2), characterized in that the introduction device (6) comprises a supply line (7) and at least two nozzles (8), via which the liquid additive (3) in the delivery line (5) and the powdery material (2) insertable is, wherein the outlet openings (9) of the at least two nozzles (8), at a distance of 0.5 - 10 m, in particular 1 - 5 m, measured in the conveying direction of the powdery material (2), on the conveying line (5) are mounted.

2. Device according to claim 1, characterized in that the conveying line (5) is an air conveyor trough.

3. Device according to one of the preceding claims, characterized in that the device (1) comprises means (10) for determining the flow rate FI _F z of the liquid additive (3) and means (11) for determining the delivery pressure P _{FZ of} the liquid additive ( 3) and optionally means (12) for determining the flow rate FI _{PM of} the powdery material (2).

4. Device according to one of the preceding claims, characterized in that the device (1) at least one control system

(13), which as a measured variable, the flow rate FI _F z of the liquid additive (3) and / or the delivery pressure P _{FZ of} the liquid Adding means (3) and / or the flow rate FI _{PM of} the powdery material (2).

5. Device according to one of the preceding claims, characterized in that the device (1) at least one

Mixing device (14) which mixes the mixture of powdered material (2) and liquid additive (3).

6. The device according to claim 5, characterized in that the mixing device (14) the powdery material (2) active in

Moving direction of the powdery material (2) moves.

7. Device according to claim 5 or 6, characterized in that the mixing device (14) within the conveying line (5) is arranged.

8. The device according to claim 7, characterized in that the mixing device (14) is a tumbling element.

9. Device according to one of claims 5-7, characterized in that the mixing device (14) comprises at least one mixing nozzle (15) through which a gas in the mixture of powdery material (2) and liquid additive (3) are blown can.

10. Device according to one of the preceding claims, characterized in that at least one of the nozzles (8) is movable, in particular rotatable to the axis of the outlet direction of the liquid additive (3).

11.Vorrichtung according to one of the preceding claims, characterized in that the powdery material (2) comprises at least one hydraulic binder, preferably selected from the group consisting of cement, mortar, gypsum, silica, fly ash, slag and blast furnace slag.

12. Device according to one of the preceding claims, characterized in that the at least one liquid

Additive (3) is selected from the group consisting of dispersant, plasticizer, flow agent, retarder, accelerator, stabilizer, shrinkage reducer, air entraining agent and

Corrosion inhibitor or a mixture thereof.

13. A method for treating, in particular coating, of powdery material (2) with at least one liquid additive (3), characterized in that the liquid additive (3) via a device (1) according to one of the preceding claims with the powdery material (2) in

Contact is brought.

14. The method according to claim 13, comprising the steps: a) conveying a powdery material (2) by a conveying line (5); b) spraying the powdery material (2) with at least one liquid additive (3) in an amount which is proportional to the flow rate FI _{PM of} the powdery material; and optionally c) determining the flow rate FI _{PM of} the powdery material (2) and / or determining at least one delivery parameter FP _{FZ of} the liquid admixture (3), wherein FP _F z the two parameters flow rate FI _F z of the liquid admixture (3) and Delivery pressure P _F Z of the liquid additive (3).

15. The method according to claim 14, comprising the steps: d) switching on or off at least one nozzle (8), via which the powdery material (2) is sprayed with at least one liquid additive (3), if at least one delivery parameter FP _{FZ of} the liquid additive (3) falls below a limit FP _FZ min or exceeds a limit value FP _FZ max, in particular if the delivery pressure P _F z of the liquid admixture (3) exceeds a limit value P _F z max; and / or e) rotating at least one nozzle (8) to the axis of the outlet direction of the liquid additive (3) if at least one delivery parameter FP _FZ of the liquid additive (3) falls below a limit value FP _FZ min or exceeds a limit value FP _FZ max, in particular the delivery pressure P _{FZ of} the liquid admixture (3) exceeds a limit P _F z _ma χ.