EP1423185A1 - Device and method for mixing a solid and a fluid - Google Patents
Device and method for mixing a solid and a fluidInfo
- Publication number
- EP1423185A1 EP1423185A1 EP02764856A EP02764856A EP1423185A1 EP 1423185 A1 EP1423185 A1 EP 1423185A1 EP 02764856 A EP02764856 A EP 02764856A EP 02764856 A EP02764856 A EP 02764856A EP 1423185 A1 EP1423185 A1 EP 1423185A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- space
- liquid
- mixing
- rotor
- solid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007787 solid Substances 0.000 title claims abstract description 117
- 238000002156 mixing Methods 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims description 12
- 239000012530 fluid Substances 0.000 title abstract 5
- 230000001133 acceleration Effects 0.000 claims abstract description 59
- 239000000725 suspension Substances 0.000 claims abstract description 53
- 239000002245 particle Substances 0.000 claims abstract description 35
- 230000033001 locomotion Effects 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 105
- 238000005192 partition Methods 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 1
- 239000000843 powder Substances 0.000 abstract description 31
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 239000013590 bulk material Substances 0.000 abstract 1
- 239000008187 granular material Substances 0.000 abstract 1
- 238000009736 wetting Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 7
- 239000006194 liquid suspension Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000011164 primary particle Substances 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/565—Mixing liquids with solids by introducing liquids in solid material, e.g. to obtain slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/51—Methods thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/53—Mixing liquids with solids using driven stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/10—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/805—Mixing plants; Combinations of mixers for granular material
- B01F33/8052—Mixing plants; Combinations of mixers for granular material involving other than mixing operations, e.g. milling, sieving or drying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/712—Feed mechanisms for feeding fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71725—Feed mechanisms characterised by the means for feeding the components to the mixer using centrifugal forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F2025/91—Direction of flow or arrangement of feed and discharge openings
- B01F2025/914—Tangential flow, i.e. flow spiraling in a tangential direction in a flat plane or belt-like area
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F2025/91—Direction of flow or arrangement of feed and discharge openings
- B01F2025/917—Laminar or parallel flow, i.e. every point of the flow moves in layers which do not intermix
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S366/00—Agitating
- Y10S366/601—Motor control
Definitions
- the invention relates to a device for mixing a powdery or granular solid with a liquid.
- a mixing device is known from DE 196 29 945 C2.
- the invention further relates to a method for mixing a solid with a liquid.
- known mixing devices in which the solid is supplied in the form of a powder bed or contains agglomerates formed from the primary particles of the powder, usually have devices for introducing shear forces into the solid / liquid suspension. These shear forces separate particles of the powder bed or powder agglomerates, so that it is possible to wet the newly created free surfaces.
- a rotor is arranged in a mixing chamber in which the solid is mixed with the liquid, to which a plurality of propeller-like mixing blades are attached along a rotor axis A.
- agglomerates obtained in the solid are comminuted, so that intensive mixing of the liquid with the dry substance is possible.
- This known mixing device has the disadvantage that a high expenditure of energy is required to apply the necessary shear forces, particularly when using highly viscous liquids or in suspensions with a high solids content. From DE 12 72 894 a device for mixing a powdery substance with a liquid is known.
- the housing of this mixing device has a cylindrical inlet channel for the powder.
- a working cone which is filled with mixing blades and has liquid feed lines, ensures that the two components are drawn into the dispersion chamber.
- the dispersion chamber is formed by a housing and a truncated cone rotating in this housing. Both the truncated cone and the discharge cone with its mixing blades are each driven via separately arranged drives in the stand part of the mixing device.
- the conical inner surface of the housing forms a truncated cone-shaped chamber with the conical rotor. At the end of this chamber there are blades which ensure that the mixture is discharged towards an outlet line.
- DE 10 67 720 discloses a device for mixing ceramic masses.
- the device used for this purpose has a filling funnel, which is followed by a screw, which conveys the possibly pre-comminuted ceramic material into a material passage.
- This material passage channel tapers to the outlet due to the different cone designs between the housing and the rotating cone surface of the rotor.
- the object of the invention is to provide a device and a method for mixing a powdery or granular solid with a liquid, by means of which the wetting of the powder particles with the liquid is promoted.
- a solid to be mixed with a liquid is introduced through at least one solid feed device into a solid feed space, where the solid particles are set in a rotary motion.
- the liquid is conducted into an acceleration space by at least one liquid supply device.
- the liquid supplied by the liquid supply device can consist of one or more components and the liquid can already contain a certain amount of solids.
- the liquid is rotated and accelerated to a predetermined speed.
- the liquid then flows into a mixing room, where it is mixed with the solid particles while maintaining the previously generated rotary movement.
- the solid / liquid suspension is passed from the mixing room into a compressor room, in which the rotating suspension is accelerated.
- the increased flow velocity of the suspension in the compressor chamber and the resulting reduced static pressure create a suction effect in an inlet area of the compressor chamber, so that the air in the capillaries of the solid bed or the powder agglomerates is sucked in.
- the solid bed supplied is at least substantially vented before entering the compressor chamber and the wetting of the powder particles with the liquid in the mixing chamber is promoted.
- the device according to the invention can be used in the production of suspensions from solids and liquids for the low to high viscosity range.
- the solids supply device comprises a pulse conveying device for feeding the solids and sealing the solids supply space from the ambient atmosphere. If the solids supply space is sealed from the ambient atmosphere by a pulse delivery device, a vacuum is generated in the solids supply space by the suction effect in the inlet area of the compressor space. As a result, the supplied solid particles are already largely deaerated in the solids supply space, whereby wetting with the liquid in the mixing space is promoted. In addition, the air in the capillaries of the supplied powder agglomerates expands, so that the agglomerates are at least partially destroyed and the free powder surface accessible to rapid wetting is thus increased.
- Suitable impulse delivery devices are, for example, a double chamber another, a rotary valve or a system with two rotatable ball valves and an intermediate chamber.
- the liquid supply device preferably comprises at least one inlet nozzle which is arranged tangentially to the direction of flow of the liquid in the acceleration chamber and is inclined in the direction of flow.
- a pure liquid consisting of one or more components can be fed through the at least one inlet nozzle, or a liquid that already contains a certain proportion of solids.
- Four to six inlet nozzles are preferably provided.
- a device for pressurizing the liquid to be supplied may be present to increase the acceleration effect. Suitable devices are e.g. a pump or a wind pressure boiler.
- the acceleration space preferably has a substantially circular cross section and is separated from the solids supply space by a partition.
- the acceleration space and the solids feed space can be arranged inside a cylindrical housing, the acceleration space surrounding the solids feed space. This arrangement enables a compact construction of the mixing device.
- spiral-shaped flow channels which are inclined in the flow direction can be formed. These flow channels stabilize the rotational movement of the liquid and can either be formed by recesses formed in the partition and / or the outer wall or by webs provided on the partition and / or the outer wall.
- the partition and / or the outer wall at least partially delimiting the acceleration space and / or an outer wall at least partially delimiting the mixing space can be rotated.
- the rotatable arrangement of the above-mentioned walls makes it possible to maintain the rotational speed of the liquid in the acceleration space and / or the suspension in the mixing space, since a Braking of the rotary movement is avoided by the surface resistance of the walls.
- Such rotatable walls are particularly advantageous when processing highly viscous or structurally viscous liquids.
- the partition between the acceleration space and the acceleration space Preferably, the partition between the acceleration space and the acceleration space
- Solids feed chamber axially displaceable.
- the flow distances of the liquid or suspension in the acceleration space or in the mixing space can be varied depending on the viscosity and the flow behavior of the liquid or suspension by an axial displacement of the partition (so-called auto-bulkhead adjustment), for example to prevent a stall. If the partition wall is moved in the direction of the compressor chamber, the flow path of the liquid in the acceleration chamber is increased, while the flow path of the suspension in the mixing chamber is reduced. If the partition wall is moved in the opposite direction, the flow path of the liquid in the acceleration space is reduced, while the flow path of the suspension in the mixing space is increased.
- a rotor which preferably has a first, a second and a third rotor section, the first rotor section being a section of the rotor which faces the solids supply device and is arranged in the solids supply space.
- the first rotor section can be provided with a pretreatment head which roughly comminutes the solid agglomerates supplied and accelerates them to a rotary movement.
- This pretreatment head can be designed in the form of a comminution screw.
- the first rotor section with the comminution screw can be connected to the second rotor section via screw or plug connections, so that it can be set in rotation with the same drive as the other rotor sections.
- a separate drive for the first and the second rotor section can also be provided.
- the rotor can be operated at a rotational speed of 1500 - 2500 rpm and preferably at a rotational speed of approximately 1500 rpm and extend from an inlet area of the mixing device to its outlet area.
- the rotatable partition and / or the outer wall at least partially delimiting the acceleration space and / or the outer wall at least partially delimiting the mixing space is / are connected to the rotor.
- the second rotor section can extend at least partially into the solids supply space and can be provided with atomizing knives.
- the introduced powder particles are atomized finely by means of the atomizing knife, so that the free powder surface accessible to rapid wetting is increased.
- the solid particles are accelerated into a rotary movement by the rotation of the atomizing knife.
- the compressor chamber has an annular gap-shaped cross section and is delimited by a frustoconical section of an outer wall and the frustoconical third rotor section, at least in the region of the compressor chamber.
- This configuration of the compressor chamber and of the rotor enables the solid / liquid suspension flowing through the compressor chamber to be accelerated in a simple manner.
- shear forces can be introduced into the suspension via the frustoconical third rotor section, which improves the homogeneity of the suspension.
- the rotor can also comprise several frustoconical sections, each of which can have different cone angles. Alternatively, the rotor can also have a pear-like shape with curved surfaces.
- an annular gap tapering between the inlet area and the outlet area of the mixing device can be formed between the rotor and a housing of the mixing device, an inner housing wall and the corresponding truncated cone surface of the rotor preferably run at an acute angle of 3 ° to 8 ° to each other.
- the mixing device preferably comprises a first detection device for detecting the flow velocity of the liquid in the acceleration space and / or a second detection device for detection of the flow velocity of the suspension in the compressor space as well as a first control device for regulating the rotational speed of the rotor as a function of the detected flow speed (s).
- the detection of the flow velocity of the liquid in the acceleration space and the corresponding one Regulation of the rotor speed makes it possible to match the rotary motion of the solid particles in the solid feed space to the rotary motion of the liquid in the acceleration space.
- the flow velocity of the suspension in the compressor chamber can be monitored and regulated, so that it can be ensured that the suspension in the compressor chamber is accelerated to a sufficiently high speed to achieve a to ensure proper functioning of the mixing device.
- the control device preferably controls the speed of rotation of the rotor so that it corresponds to the flow rate of the liquid in the acceleration space.
- the solid particles in the solid feed space can be set into a rotational movement that is synchronous with the rotational movement of the liquid in the acceleration space, so that a laminar flow arises in the mixing space.
- "splashing" of the liquid during the transition from the acceleration space into the mixing space can be avoided, so that the formation of deposits or incrustations on the walls of the mixing device by fast-drying liquids is prevented. Applying a release coating, e.g. A Teflon coating on the walls is therefore no longer absolutely necessary.
- Web-shaped conveying devices are preferably arranged on the third rotor section.
- the use of such conveyors is particularly advantageous when processing low-viscosity suspensions, since they lead to an increase in the starting resistance and thus to an increased acceleration and an improved homogeneity of the suspension in the compressor chamber.
- the conveyor devices preferably run in the area of the compressor chamber at an angle of 15 ° to 45 ° to the rotor axis.
- the conveying devices can each be provided with bores.
- the conveying devices can also extend over the entire axial length of the rotor.
- the conveying elements in the area of the solids supply space are then preferably inclined at an angle of 15 ° to 45 ° to the rotor axis in the direction of rotation and have a greater height there than in the compressor space.
- the rotor is axially displaceable.
- the cross-section of the compression chamber and thus the shear forces introduced into the suspension in the compressor chamber can be varied as a function of the viscosity of the suspension to be processed by an axial displacement of the rotor.
- the axial displaceability of the rotor can counteract damage to the mixing device by foreign bodies contained in the solids.
- the mixing device may further comprise a third detection device for detecting the pressure prevailing in the solids supply space and a second control device for regulating the metering speed (s) of the solids supply device and / or the liquid supply device.
- a third detection device for detecting the pressure prevailing in the solids supply space
- a second control device for regulating the metering speed (s) of the solids supply device and / or the liquid supply device.
- the liquid surface flow in the mixing chamber is substantially equal to the specific particle surface of the solid particles introduced into the mixing chamber.
- a vertical flow rate of the suspension in the mixing space is preferably at least 1-2 m / s, so that a surface exchange of at least 1-2 m 2 / s is obtained.
- FIG. 1 is a schematic representation of a first embodiment of the mixing device according to the invention.
- FIG. 2 shows a detail of the first exemplary embodiment of the mixing device according to the invention shown in FIG. 1;
- FIG. 3 shows a detail of a second exemplary embodiment of the mixing device according to the invention.
- FIG. 5 shows a detail of a fourth exemplary embodiment of the mixing device according to the invention.
- FIG. 6 shows a detail of a fifth exemplary embodiment of the mixing device according to the invention.
- Fig. 7 is a cross sectional view of the rotor of the mixing device shown in Fig. 6;
- Fig. 8 is a plan view of the rotor shown in Fig. 7.
- the device comprises a storage container 12 with a solid bed 13 which is introduced into a solid feed space 16 via a pulse conveyor 14.
- the pulse delivery device 14 has a first ball valve 18, which is synchronized via a chain drive 20 with a second ball valve 22 and is driven by a drive motor 24. Between the first and the second ball valve 18, 22 there is an intermediate chamber 26. When the first ball valve 18 is in its open position, the intermediate chamber 26 is charged with the solid bed 13 contained in the storage container 12, while the second ball valve 22 the solid -Supply space 16 seals against the ambient atmosphere. Then, as shown in the drawing, the second ball valve 22 is opened, so that the solid bed 13 located in the intermediate chamber 26 is emptied into the solids supply space 16. The first ball valve 18 is then in its closed position.
- a pressure measuring device 28 for detecting the pressure in the solids supply space 16 and a regulating device 30 which regulates the output of the drive motor 24 as a function of the pressure detected by the pressure measuring device 28. If the pressure in the solids supply space 16 increases, the control device 30 controls the output of the drive motor 24 in such a way that the metering speed of the pulse delivery device 14 is reduced.
- the control device 30 can be connected to the pump 38 via a connecting line (not shown in the figure) and control the metering speed of the liquid 32 fed into the acceleration chamber 42 as a function of the pressure in the solids supply chamber 16 detected by the pressure measuring device 28.
- a liquid 32 to be mixed with the solid bed 13 is located in a container 34 into which one or more liquid components are introduced via a metering line 36. Downstream of the container 34 is in one
- Supply line 37 a pump 38 is arranged, which conveys the liquid 32 from the container 34 to an inlet nozzle 40 under pressure.
- the liquid 32 flows from the inlet nozzle 40 into an acceleration chamber 42.
- the inlet nozzle 40 is arranged tangentially to a housing wall 44 and thus tangentially to the direction of flow of the liquid 32 in the acceleration chamber 42 and is inclined in the direction of flow.
- the acceleration space 42 has an annular cross section and is delimited by the housing wall 44 and by an axially displaceable partition wall 46 which separates the acceleration space 42 from the solids supply space 16.
- a rotor 54 which can be displaced along a rotor axis A has a first, a second and a third rotor section 56, 58, 60, the first rotor section 56 facing the pulse conveying device 14 and being arranged in the solids supply space 16. Furthermore, the first rotor section 56 is provided with a pretreatment head 62. The second rotor section 58 is likewise arranged in the solids supply space 16 and has a plurality of ones perpendicular to the rotor axis. - Il ⁇
- a extending atomizing knife 64 A plurality of conveyor webs 66 are fastened to the third rotor section 60, which is in the shape of a truncated cone, some of which are provided with bores 68.
- the rotor 54 is driven by a rotor drive motor 70.
- the axial displacement of the rotor 54 is realized by means of a hydraulic pump 74 connected to a piston 72.
- a mixing chamber 76 and a compressor chamber 78 are located on the downstream side of the acceleration chamber 42.
- the compressor chamber 78 has an annular-gap-shaped cross section and is delimited by a section 80 of the housing wall 44 in the shape of a truncated cone and the third rotor section 60 in the shape of a truncated cone.
- the liquid 32 By introducing the pressurized liquid 32 through the inlet nozzle 40 arranged tangentially to the housing wall 44 and inclined in the direction of flow, the liquid 32 is set into a rotary movement in the acceleration space 42 and accelerated to a predetermined speed.
- the solids 13 fed by the pulse conveying device 14 are also set in rotation by the rotor 54 in the solids supply space 16, powder agglomerates present in the solids 13 first being roughly comminuted by the pretreatment head 62 and then finely atomized by the atomizing knives 64.
- the velocity of the liquid 32 in the acceleration space 42 is detected by means of a flow velocity measuring device, not shown in the drawing.
- a control device also not shown, controls the rotational speed of the rotor 54 in such a way that it corresponds to the speed of the liquid 32 in the acceleration space 42.
- the liquid 32 in the acceleration space 42 and the solids 13 in the solids supply space 16 are rotated synchronously with one another, so that a laminar flow occurs in the mixing space 76.
- the liquid 32 flows from the acceleration space 42 at a constant rotational speed into the mixing space 76, where it is mixed with the solid particles 13, the solid particles 13 being in the form of finely atomized agglomerates, but not as primary particles.
- the powder particles 13 are transported in the direction of the liquid layer flowing along the housing wall 44 by the centrifugal forces resulting from the rotary movement.
- the surface resistance of the housing wall 44 creates deep vortices in the Liquid layer through which the liquid layers flowing directly along the housing wall 44 are also transported in the direction of the surface of the liquid flow facing the solids supply space 16, where they are available for mixing with the supplied solid particles 13.
- the flow distances of the liquid 32 in the acceleration space 42 or the suspension in the mixing space 76 can be varied depending on the viscosity and the flow behavior of the liquid 32 or the suspension, for example, a stall, by an axial displacement of the partition wall 46 (so-called auto-bulkhead adjustment) submissions.
- the solid / liquid suspension flows from the mixing space 76 into the compression space 78, where it is accelerated by means of the third rotor section 60, which is in the shape of a truncated cone.
- the increased flow velocity of the suspension in the compressor chamber 78 creates a suction effect (jet pump effect) in an inlet area 82 of the compressor chamber 78 due to the reduced static pressure due to the increase in the flow velocity, so that the air in the capillaries of the fine powder agglomerates 13 is sucked in.
- the pulse conveying device 14 also seals the solids supply space 16 from the ambient atmosphere, a negative pressure is created in the solids supply space 16, so that the supplied solid particles 13 are already vented in the solids supply space 16.
- the speed of the suspension in the compressor chamber 78 is recorded by means of a flow rate measuring device, not shown in the drawing.
- a control device also not shown, controls the rotational speed of the rotor 54 in such a way that it is ensured that the suspension in the compressor chamber 78 is accelerated to a sufficiently high speed in order to ensure proper functioning of the mixing device 10 and in order to set a relative speed equal to zero spraying or to prevent spraying.
- the air in the capillaries of the supplied powder agglomerates 13 expands due to the negative pressure in the solids supply space 16, so that the agglomerates 13 are at least partially destroyed.
- the air flowing to the inlet area 82 of the compressor chamber 78 transports the powder particles 13 into the Mixing room 76, where they are immersed in the laminar flow path due to the centrifugal forces.
- the suspension flows from the compressor chamber 78 into a first outlet line 84.
- the a pressure regulator 86 is present in the first outlet line 84.
- the suspension can be emptied from the first outlet line 84 into a second outlet line 88, in which there is a further pressure regulator 90 for maintaining a constant pressure.
- FIG. 3 shows a section of an alternative embodiment of the mixing device 10, in which the rotor 54 has a fourth rotor section 92.
- the fourth rotor section 92 comprises a first section 94 extending parallel to the rotor axis A and a second section 96 extending at an angle of approximately 60 ° to the rotor axis A.
- the first section 94 forms a rotatable outer wall which completely delimits the mixing space 76 and the acceleration space 42, by means of which the rotational speed of the liquid 32 in the acceleration space 42 and / or the suspension in the mixing space 76 can be maintained.
- the second section 96 is provided with a suspension passage opening 98.
- the partition wall 46 and a wall 100 arranged parallel to the housing wall 44 are connected to a fifth rotor section 102 extending perpendicular to the rotor axis A.
- the wall 100 extends along the acceleration space 42 and along an essential section of the mixing space 76.
- the fifth rotor section 102 is provided with a solid passage opening 104 for the unhindered passage of the solid particles 13, while the wall 100 has a liquid inlet opening 106 for the unimpeded inlet of the liquid 32 into the acceleration space 42. Due to the rotatable arrangement of the wall 100 and the partition 46, the liquid 32 in the acceleration space 42 can be accelerated particularly effectively and the rotational speed of the suspension in the mixing space 76 can be maintained, so that the mixing device 10 is particularly suitable for processing highly viscous or structurally viscous liquids and suspensions.
- the exemplary embodiment of the mixing device 10 shown in FIG. 5 has a rotatable section 108 of the housing wall 44, which extends in each case over partial regions of the acceleration space 42 and of the mixing space 46. In this embodiment, too, an axial displacement of the partition 46 is not possible.
- the drive of the rotatable section 108 of the housing wall 44 can be coupled to the rotor drive 70. However, it is also possible to provide a drive for the rotatable section 108 of the housing wall 44 which is separate from the rotor drive 70.
- the exemplary embodiment of the mixing device 10 shown in FIG. 6 has a solids feed chamber 16 and a filling shaft 110 with a funnel-shaped inlet opening.
- the filling shaft 110 sits in a cover 112 of a housing 114 of the mixing device 10 and is screwed to it.
- a radially arranged material outlet 118 is provided in a bottom 116 of the housing 114, through which the mixed material produced in the compressor chamber 78 flows out.
- the rotor 54 of the mixing device 10 differs from the rotors shown in FIGS. 1 to 5 in that it does not comprise a first rotor section provided with a pretreatment head and no second rotor section equipped with atomizing knives. Instead, the rotor 54 is frustoconical, so that the annular-gap-shaped compressor chamber 78 is delimited by an inner wall 120 of the cover 112 and a frustoconical surface of a central partial region 122 of the rotor 54.
- the inner wall 120 of the cover 112 and the frustoconical surface of the rotor 54 extend in the partial region 122 at an angle of 5 °, so that the annular gap forming the compressor chamber 78 tapers from the inlet region 82 of the compressor chamber in the direction of the material outlet 118.
- the distance between the conveying devices 66, which are designed as webs in the area of the compressor chamber 78, remains constant with respect to the inner wall 120 of the cover 112.
- the rotor 54 has the largest diameter in an outlet area 128.
- the sections of the conveying devices 66 arranged in the outlet area 128 of the rotor 54 thus generate a centrifugal flow that is higher in relation to the mixing space 76 and support a residue-free discharge.
- the rotor 54 projects into the solids supply space 16 into the lower end of the filling shaft 110.
- the conveyor webs 66 extend up to a wall 136 of the filling shaft 110.
- the conveying webs 66 conveying in the direction of the rotor axis A to the material outlet 118 prevent liquid from penetrating into the interior of the filling shaft 110.
- the conveying webs 66 are at the end of the rotor 54 facing the solids supply chamber 16 inclined by about 45 ° in the direction of rotation.
- the liquid is supplied through inlet nozzles 40, which are attached in an attachment 134 of the cover 112.
- the inlet nozzles 40 lie opposite an end of the wall 136 of the filling shaft 110 facing the compressor chamber 78. Due to the tangential and inclined flow direction of the inlet nozzles 40, the liquid flows along the wall 136 of the filling shaft 110 along a spiral line in the direction of the mixing space 76.
- the liquid can be supplied via one or more inlet nozzles 40 distributed around the attachment 134, if necessary , various liquid additives can also be introduced.
- cooling chambers 130, 132 are arranged in the cover 112 and in the bottom 116.
- the coolant flowing through these chambers 130, 132 provides for cooling of the mixed material during the dispersing process taking place under considerable pressure in the compressor chamber 78 and the outlet area 128.
- FIGS. 7 and 8 of the rotor 54 used in the mixing device according to FIG. 6 illustrates the arrangement of the web-shaped conveying devices 66. In the embodiment of the rotor 54 shown here, eight conveying webs 66 are at a distance of 45 ° above the surface of the rotor 54 distributed.
- the inclination of the conveying webs 66 with respect to the rotor axis A differs in the individual effective areas of the rotor 54. In the area of the rotor 54 with the smallest cross section, the conveyor webs 66 are inclined by 45 ° in the direction of rotation and have their greatest height. In the mixing space 76, in which the liquid is mixed with the dry material, the conveyor webs 66 extend along the rotor axis A.
- the compressor webs 78 themselves are inclined at 30 ° to the rotor axis.
- the conveyor webs 66 run axially parallel to the rotor axis A along the entire outer semicircular cross section of the rotor 54.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10139413 | 2001-08-17 | ||
DE10139413A DE10139413B4 (en) | 2001-08-17 | 2001-08-17 | Device for mixing and dispersing powdery fine to coarse-grained substances with at least one liquid |
DE10163397 | 2001-12-21 | ||
DE10163397A DE10163397B4 (en) | 2001-12-21 | 2001-12-21 | Apparatus and method for mixing a solid with a liquid |
PCT/EP2002/009265 WO2003022416A1 (en) | 2001-08-17 | 2002-08-19 | Device and method for mixing a solid and a fluid |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1423185A1 true EP1423185A1 (en) | 2004-06-02 |
EP1423185B1 EP1423185B1 (en) | 2005-01-19 |
Family
ID=26009927
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02764856A Expired - Lifetime EP1423185B1 (en) | 2001-08-17 | 2002-08-19 | Device and method for mixing a solid and a fluid |
Country Status (6)
Country | Link |
---|---|
US (1) | US7287897B2 (en) |
EP (1) | EP1423185B1 (en) |
CN (1) | CN1240471C (en) |
DE (1) | DE50202072D1 (en) |
ES (1) | ES2233860T3 (en) |
WO (1) | WO2003022416A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111407984A (en) * | 2020-04-13 | 2020-07-14 | 李青翠 | Internal medicine equipment of dosing is breathed to portable |
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DE10320739B3 (en) * | 2003-05-09 | 2004-10-21 | Ika - Werke Gmbh & Co. Kg | Device for dispersing and/or homogenizing pumpable material mixtures comprises a pump arranged in the feed direction of the material at a distance from a dispersing and/or homogenizing tool and in front of the opening of a feed line |
DE102006012489A1 (en) * | 2006-03-16 | 2007-09-20 | Netzsch-Feinmahltechnik Gmbh | Process and apparatus for mineral processing |
US8372348B2 (en) * | 2008-06-30 | 2013-02-12 | Arch Chemicals, Inc. | Apparatus and method for mixing a concentrated water treatment solution |
CN101879420B (en) * | 2010-05-18 | 2012-05-23 | 云南大红山管道有限公司 | Solid powder pulping system |
US8580103B2 (en) | 2010-11-22 | 2013-11-12 | Metcon, Llc | Electrolyte solution and electrochemical surface modification methods |
US8715720B2 (en) * | 2011-09-14 | 2014-05-06 | Scott Murray | Cloud mixer and method of minimizing agglomeration of particulates |
CN102614792B (en) * | 2012-03-31 | 2013-12-18 | 和原生态控股股份有限公司 | Intelligent fertilizer distributing machine |
DE102016102728A1 (en) * | 2015-08-13 | 2017-02-16 | Netzsch-Feinmahltechnik Gmbh | Apparatus and method for dispersing at least one substance in a fluid |
CN109772189A (en) * | 2017-11-13 | 2019-05-21 | 深圳市尚水智能设备有限公司 | It is suitble to the solid-liquid mixing device of high-viscosity material and the mixed method using the equipment |
CN108671789A (en) * | 2018-02-27 | 2018-10-19 | 罗斯(无锡)设备有限公司 | A kind of powder and liquid premixing machine |
CN108393008A (en) * | 2018-04-26 | 2018-08-14 | 无锡先导智能装备股份有限公司 | Rabbling mechanism and pulping device |
CN108404749A (en) * | 2018-04-26 | 2018-08-17 | 无锡先导智能装备股份有限公司 | Liquid addition mechanism and pulping device |
CN109173815A (en) * | 2018-10-10 | 2019-01-11 | 深圳市尚水智能设备有限公司 | A kind of device and method thereof mixed for solid and liquid |
CN110394082B (en) * | 2019-07-31 | 2021-08-13 | 深圳市尚水智能设备有限公司 | Impeller assembly and solid and liquid mixing equipment using same |
DE102022101814A1 (en) * | 2022-01-26 | 2023-07-27 | Ekato Systems Gmbh | Device for homogenizing and/or dispersing free-flowing substances |
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DE41822C (en) | DlERKS & MÖLLMANN in Osnabrück | Innovation in chuck cutting machines | ||
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NL200327A (en) * | 1952-11-25 | |||
DE1272894B (en) * | 1963-12-23 | 1968-07-18 | Pierre Alexandre Foucault | Device for mixing a powdery substance with a liquid |
FR2036249A5 (en) | 1969-03-07 | 1970-12-24 | Neyrpic Bmb | |
US3606270A (en) * | 1970-05-14 | 1971-09-20 | Ludish Co | Continuous power blender |
DE2403053A1 (en) * | 1974-01-23 | 1975-07-31 | Supraton Auer & Zucker | FACILITY FOR THE PRODUCTION OF A SUSPENSION FROM HIGH-SWELL FABRICS |
US4106117A (en) * | 1976-05-07 | 1978-08-08 | Waukesha Foundry Company, Inc. | Apparatus for mixing particulate material in a liquid |
US4239396A (en) * | 1979-01-25 | 1980-12-16 | Condor Engineering & Manufacturing, Inc. | Method and apparatus for blending liquids and solids |
DD262813A1 (en) | 1987-08-12 | 1988-12-14 | Sket Veb Ingenieurbetrieb Fuer | PROCESS AND DEVICE FOR SOLID-FLUID MIXTURE |
GB8902883D0 (en) | 1989-02-09 | 1989-03-30 | North West Water Authority | Improvements in or relating to mixing devices |
JP3591874B2 (en) * | 1994-06-21 | 2004-11-24 | 東レ・ダウコーニング・シリコーン株式会社 | Continuous kneading device for liquid and powder |
DE19629945C5 (en) * | 1996-07-25 | 2008-10-16 | Ika-Werke Gmbh & Co. Kg | Mixing device for mixing powdery and / or granular particles with a liquid |
US5932270A (en) * | 1997-07-09 | 1999-08-03 | The J. M. Smucker Company | Cold process, oven stable fruit paste and method of making such paste |
US5904419A (en) * | 1997-07-29 | 1999-05-18 | Arribau; Jorge O. | Blender method and apparatus |
DE10139413B4 (en) | 2001-08-17 | 2004-02-05 | Netzsch-Feinmahltechnik Gmbh | Device for mixing and dispersing powdery fine to coarse-grained substances with at least one liquid |
-
2002
- 2002-08-19 WO PCT/EP2002/009265 patent/WO2003022416A1/en not_active Application Discontinuation
- 2002-08-19 DE DE50202072T patent/DE50202072D1/en not_active Expired - Lifetime
- 2002-08-19 CN CNB028160851A patent/CN1240471C/en not_active Expired - Lifetime
- 2002-08-19 EP EP02764856A patent/EP1423185B1/en not_active Expired - Lifetime
- 2002-08-19 ES ES02764856T patent/ES2233860T3/en not_active Expired - Lifetime
-
2006
- 2006-08-04 US US11/499,455 patent/US7287897B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
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See references of WO03022416A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111407984A (en) * | 2020-04-13 | 2020-07-14 | 李青翠 | Internal medicine equipment of dosing is breathed to portable |
CN111407984B (en) * | 2020-04-13 | 2022-03-25 | 李青翠 | Internal medicine equipment of dosing is breathed to portable |
Also Published As
Publication number | Publication date |
---|---|
WO2003022416A1 (en) | 2003-03-20 |
EP1423185B1 (en) | 2005-01-19 |
DE50202072D1 (en) | 2005-02-24 |
CN1543376A (en) | 2004-11-03 |
ES2233860T3 (en) | 2005-06-16 |
CN1240471C (en) | 2006-02-08 |
US20060268657A1 (en) | 2006-11-30 |
US7287897B2 (en) | 2007-10-30 |
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