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EP4643112A1 - Dispositif de désagglomération et dispositif de mesure de particules - Google Patents

Dispositif de désagglomération et dispositif de mesure de particules

Info

Publication number
EP4643112A1
EP4643112A1 EP24702490.4A EP24702490A EP4643112A1 EP 4643112 A1 EP4643112 A1 EP 4643112A1 EP 24702490 A EP24702490 A EP 24702490A EP 4643112 A1 EP4643112 A1 EP 4643112A1
Authority
EP
European Patent Office
Prior art keywords
flow
carrier gas
particle
particle mixture
chamber
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.)
Pending
Application number
EP24702490.4A
Other languages
German (de)
English (en)
Inventor
Sascha Albrecht
Marcus Grigat
David Krix
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Microtrac Retsch GmbH
Original Assignee
Microtrac Retsch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE102023110688.0A external-priority patent/DE102023110688A1/de
Application filed by Microtrac Retsch GmbH filed Critical Microtrac Retsch GmbH
Publication of EP4643112A1 publication Critical patent/EP4643112A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N1/2211—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with cyclones
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N2015/0019—Means for transferring or separating particles prior to analysis, e.g. hoppers or particle conveyors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N2015/0042—Investigating dispersion of solids
    • G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N2015/0092—Monitoring flocculation or agglomeration

Definitions

  • the invention relates to a deagglomeration device for particle separation and dissolution of particle agglomerations in a carrier gas-particle mixture.
  • the present invention relates to a particle measuring device, in particular for particle classification and/or for determining grain size and grain shape information, with at least one deagglomeration device of the aforementioned type or with several deagglomeration devices of the aforementioned type connected in series or in parallel in a flow path.
  • particle size and shape information are important process and quality indicators.
  • Dry powders composed of small particles are used and manufactured in many different industries. Examples of such powders include food, pharmaceuticals, cement, abrasives, pigments, toners and surface coating materials. It is often very important to measure and control the size of these dry powders, as size can affect the function of a material.
  • size of pharmaceutical powders which affects the rate at which the active ingredients are dissolved and absorbed into the body.
  • the dynamic image analysis method makes it possible to analyze grain size and grain shape information in detail and representatively.
  • a sample stream is generated, which is recorded and analyzed by a camera system.
  • the particle size, particle shape and particle number can be determined from the images of the sample stream obtained with a camera system.
  • Dynamic image analysis is used to determine grain size and grain shape information, primarily for larger particles.
  • the particles are in Movement.
  • the particle stream is illuminated from one side by a light source and the particle images are recorded as shadow projectors.
  • the particles can move in an air stream, which is intended to separate the particles in agglomerated powders. Short exposure times and high recording rates are required to achieve sufficient particle detection during the measurements and to prevent motion blur.
  • a particle measurement with dynamic image analysis usually takes one to five minutes and, depending on the sample, usually records several 10,000 to many millions of particles.
  • particle size distributions can be determined, particularly of smaller particles, such as laser diffraction analysis, also known as static light scattering. This method is based on the deflection of a laser beam by a collective of particles, which may be dispersed in an air stream. The diffraction angles or scattering angles are characteristic of the particle size. Representative measurements of the particle size depend, among other things, on the particle concentration in the sample.
  • a detected particle size can correspond to a multiple of the actual particle size, since the outer diameter of the particle agglomerate is measured.
  • Particle agglomeration can become particularly important when interactions between the particles become more important with decreasing particle size, which is particularly the case for particles in the micrometer range or smaller. Van der Waals interactions increase with decreasing particle size and can be 100 times greater than the influence of gravity for particles 10 pm in size. Other influencing factors can also lead to increased agglomeration of certain particles. For example, the water content in the particle powder can affect particle agglomeration.
  • the object of the present invention is to remedy this situation and to provide a deagglomeration device for particle separation and dissolution of particle agglomerations in a carrier gas-particle mixture for use in a particle measuring device, wherein the deagglomeration device leads to effective deagglomeration in agglomerated powders and thus simplifies and ensures the detailed and representative analysis of a sample material for determining grain number, grain size and grain shape information.
  • the invention proposes a deagglomeration device for particle separation and dissolution of particle agglomerations in a carrier gas-particle mixture with the features of patent claim 1 and a particle measuring device, in particular designed for dynamic image analysis, laser diffraction analysis or time-of-flight analysis, with at least one deagglomeration device of the type according to the invention or with several deagglomeration devices of the type according to the invention connected in series or in parallel in a flow path according to claim 14.
  • Advantageous further developments of the invention are the subject of the subclaims.
  • the deagglomeration device has a flow body or housing for the carrier gas-particle mixture which delimits a flow chamber and in which highly effective deagglomeration of agglomerated powders occurs during the flow.
  • the flow body has a curved chamber wall for generating a circular flow or vortex flow of the carrier gas-particle mixture as it flows over the chamber wall, with preferably only one inlet opening for a carrier gas-particle mixture and preferably only one outlet opening for the carrier gas-particle mixture being provided in the chamber wall.
  • the inflow and outflow of the carrier gas-particle mixture then preferably only takes place via the inlet opening and the outlet opening.
  • the flow body is closed and/or closable from the environment.
  • the flow body is designed to be closed and forms a closed system.
  • a “closed system” in the sense of the invention is in particular a design of the flow body, wherein the flow body is particle-tight, in particular gas-tight, to create pressure differences between the inlet opening and the outlet opening.
  • a carrier gas-particle mixture can be fed to the flow-through body via the inlet opening in the chamber wall, wherein the carrier gas-particle mixture can be transported or flows from the inlet opening to the outlet opening, forming a circular flow or vortex flow along the inner surface of the chamber wall, and wherein the carrier gas-particle mixture can be discharged from the flow-through chamber via the outlet opening for later particle size, particle shape and particle number analysis in a particle measuring device.
  • the particles are caught in the flow-through body, which forms a retaining body, by means of a circular flow and/or vortex flow formed when flowing over the chamber wall, which according to the invention can result in a retention factor of the particles in the flow-through body that is 10 times or more higher than with pure pipe or hose flow.
  • the particles are forced against the inner wall of the flow-through body by centrifugal forces and separated from one another by interactions with the chamber wall.
  • Factors influencing the degree of deagglomeration are including the surface roughness of the chamber wall and the flow velocity or volume flow of the carrier gas-particle mixture.
  • Tests carried out within the scope of the invention have confirmed the high effectiveness of the deagglomeration device according to the invention.
  • Tests on particle separation and dissolution of particle agglomerations of carrier gas-particle mixtures with particles in the size range of smaller than 1 to 10 pm have confirmed that the deagglomeration device according to the invention can lead to highly efficient particle separation and particle agglomerations, particularly with smaller particle sizes.
  • the deagglomeration device provides for the flow-through body to be designed as a substantially closed system, wherein the flow-through body preferably only allows the carrier gas-particle mixture to be supplied via the inlet opening and the carrier gas-particle mixture to be removed via the outlet opening and at least essentially prevents any undesired transfer of particles from the flow-through body into the environment.
  • the flow body is designed due to its shape or the geometry of the chamber wall such that only low flow resistance occurs when the carrier gas particle mixture flows through the flow body.
  • the flow body is free of built-in components and/or preferably no projections are provided on the inner wall which extend inwards by more than 5 mm, preferably more than 2 mm, more preferably more than 1 mm, particularly preferably more than 0.5 mm or less, relative to adjacent wall surfaces of the chamber wall.
  • the chamber wall of the flow body encloses or surrounds a rotation volume which is preferably closed to the environment with the exception of the inlet opening and the outlet opening in the chamber wall. This does not exclude the possibility that part of the chamber wall can be opened by a detachable wall section in order to enable access to the rotation body, for example for cleaning purposes.
  • a flow volume of the flow body which is limited by the chamber wall of the flow body, corresponds to the rotation volume of the flow body, wherein the inner surface of the flow body is formed by rotation of a generating curve around a rotation axis and the flow volume is limited by the generating curve.
  • the flow volume ends on the inside of the chamber wall of the flow body and does not extend beyond the inlet opening and the outlet opening of the flow body.
  • the flow volume of the flow body preferably has a size that corresponds to the size of the rotation volume limited by the chamber wall of the flow body, wherein according to the invention the maximum rotation volume is used for particle flow.
  • Typical entry and exit velocities of the carrier gas-particle mixture into or out of the flow body can be in the order of magnitude between 1 and 100 m/s.
  • the carrier gas-particle mixture is introduced into the flow chamber via the inlet opening tangentially adjacent to the chamber wall. Accordingly, the inlet opening can be connected tangentially to an inner diameter of the chamber wall.
  • a “tangential” inlet of the carrier gas-particle mixture is to be understood in particular as meaning that there is no sudden change in the flow direction of the carrier gas-particle mixture entering the flow chamber when passing through the inlet opening.
  • a “tangential” inlet is further understood to mean that when the carrier gas-particle mixture enters the flow chamber, there is no or only a slight diversion of the direction of the carrier gas flow in the Transition area between the inlet opening and the chamber wall of the flow body.
  • the carrier gas-particle mixture is introduced tangentially into a circular or vortex flow formed on the chamber wall.
  • the invention can provide that the carrier gas-particle mixture is discharged from the flow chamber via the outlet opening tangentially adjacent to the chamber wall. Accordingly, the outlet opening can also be connected tangentially to an inner diameter of the chamber wall.
  • a “tangential" discharge of the carrier gas-particle mixture is to be understood in particular as meaning that there is no sudden change in the flow direction of the carrier gas-particle mixture emerging from the flow chamber when passing through the outlet opening.
  • a “tangential" outlet is further understood to mean in particular that when the carrier gas-particle mixture exits the flow chamber, no or only a slight redirection of the carrier gas flow occurs in the transition region between the outlet opening and the chamber wall of the flow body.
  • a "tangential" inlet or outlet is to be understood in particular as meaning that the carrier gas-particle mixture is fed tangentially to the inner surface of the chamber wall of the flow chamber to the inner surface or impinges on the inner surface.
  • a high degree of deagglomeration with low flow losses is achieved by a tangential inlet or a tangential inflow of the carrier gas-particle mixture into the flow body and/or a tangential outlet or a tangential outflow of the carrier gas-particle mixture from the flow body.
  • the chamber wall can be concavely curved at least in sections.
  • the chamber wall is circular in cross-section at least in sections, preferably over the entire height of the flow body.
  • the flow body is preferably designed as a rotary hollow body, in particular as a hollow cylinder.
  • the flow body is particularly preferably designed as a closed rotary hollow body.
  • the chamber wall of the flow body can form and/or delimit a cylindrical flow chamber.
  • the chamber wall can be designed as a hollow cylinder with an inner cylindrical surface along which the carrier gas-particle mixture flows in the circumferential direction after entering the flow body and is brought onto a circular path.
  • the flow body can have an upper, preferably flat, end wall and/or a lower, preferably flat, end wall, which adjoin the chamber wall perpendicular to the longitudinal axis of the flow chamber and whose inner surfaces delimit the flow chamber in the axial direction.
  • the flow body prefferably forms and/or delimit a flow chamber with a preferably upper cylindrical inlet section in the use state of the deagglomeration device according to the invention and a lower conical or truncated cone-shaped outlet section in the use state and to have a corresponding inner wall geometry.
  • the cylindrical inlet section is delimited by a first axial wall section of the chamber wall of the flow body, which forms an inner cylindrical surface along which the carrier gas-particle mixture flows in the circumferential direction after entering the flow body and is brought onto a circular path.
  • the inlet opening is provided in the first axial wall section of the flow body.
  • the carrier gas-particle mixture is supplied via the inlet opening in the inlet cylinder section, in particular tangentially.
  • the carrier gas-particle mixture is discharged via an outlet opening in the outlet section, particularly axially, preferably centrally to the axis of rotation.
  • the conical or truncated cone-shaped outlet section is separated by a further axial wall section of the chamber wall of the flow body.
  • the further axial wall section can taper downwards and have or form the outlet opening at its lower end.
  • the flow body can have an upper, preferably flat, radial wall section which adjoins the first axial wall section of the chamber wall perpendicular to the longitudinal axis of the flow chamber and delimits the flow chamber upwards in the axial direction.
  • the chamber wall of the flow body in particular in the region of the inlet opening and/or in the region of the outlet opening, is aligned on the inside and free of projections directed radially inwards in order to avoid an accumulation and build-up of particles that are difficult to remove.
  • the flow body may have and/or delimit a truncated cone-shaped flow chamber, with the inlet of the carrier gas-particle mixture preferably taking place tangentially via an inlet opening in an inner wall of the flow body, which can be provided adjacent to an upper cone edge in the use state, at which the cone reaches the largest radius.
  • the outlet can take place tangentially or preferably axially via an outlet opening, with the outlet opening being provided at the lower cone edge, at which the cone bluntly reaches the largest radius.
  • an embodiment of the flow-through body is provided in which the flow-through body is free of internal components and/or free of mechanically and/or motor-driven and/or movable components and/or wherein the flow volume of the flow-through body corresponds to the rotation volume of the flow-through body.
  • no fittings are provided in the flow chamber that could narrow the flow area of the flow chamber and cause particle accumulation and buildup.
  • the flow body is free of mechanically moved and/or movable parts and/or fittings that can restrict or reduce the flow volume, wherein the flow volume of the flow body can at least substantially correspond to the rotation volume relative to the inner surface of the flow body.
  • internals can also be provided, provided that it is ensured that these cause little to no deposits of particles.
  • the flow around the internals must be optimized in terms of flow technology in order to avoid dead zones. In any case, a low flow resistance should be ensured when the carrier gas-particle mixture is passed through the flow chamber.
  • the inlet opening can be connected to an inlet line for supplying the carrier gas-particle mixture into the flow chamber.
  • an outlet line can be provided for the removal of the carrier gas-particle mixture, which is connected to the outlet opening and originates at the outlet opening.
  • the inlet line can be connected and/or connectable to a sample feed device and/or end in the area of the sample feed device.
  • the outlet line can be connected and/or connectable to a particle measuring device, in particular a particle measuring volume, or end in the area of the particle measuring device.
  • the inlet line and/or the outlet line can be a hose.
  • a rigid line routing via a pipe is also possible.
  • the inlet line can, for example, be connected to a vibrating trough and/or end in the area of a vibrating trough, with the sample being fed in via the vibrating trough.
  • a particle sample fed into the vibrating trough can be sucked in via the inlet line together with ambient air as a carrier gas and transported to the flow chamber.
  • the outlet line can be connected and/or connectable to a suction device for suctioning the carrier gas-particle mixture through the flow chamber.
  • the inlet line can be connected and/or connectable to a conveying device for transporting the carrier gas-particle mixture through the flow chamber to the particle measuring device.
  • connection area in particular designed as a pipe socket, can be provided on the flow body for connection to a hose or a pipe in order to transport the carrier gas-particle mixture via the Inlet opening to introduce the carrier gas-particle mixture into the flow chamber or to discharge the carrier gas-particle mixture from the flow chamber via the outlet opening.
  • the connection area can be formed on the flow body in particular tangentially, and furthermore in particular radially on the outside.
  • the connection area can cut into the chamber wall of the flow body tangentially, i.e. laterally and not radially.
  • the inlet opening in the chamber wall of the flow body can accordingly have a non-circular, in particular drop-shaped, boundary contour.
  • connection area in particular designed as a pipe socket, can be provided for discharging the carrier gas-particle mixture from the flow chamber.
  • the connection area can be formed or designed on the flow body in particular tangentially, and furthermore in particular radially on the outside.
  • the connection area can cut into the chamber wall tangentially, i.e. laterally and not radially.
  • the outlet opening in the chamber wall of the flow body can accordingly also have a non-circular, in particular drop-shaped, boundary contour.
  • a connection region can be formed or formed on a chamber wall of the flow-through body forming the outlet section, in particular centrally to the axis of rotation of the outlet section at the lower end of the truncated cone, wherein the carrier gas-particle mixture is discharged in an axial direction downwards.
  • the chamber wall can be embossed and/or surface-treated in a certain way. Surface effects can help to hold and rub the particles in the area of the surface or inner surface of the chamber wall of the flow body for longer, which increases the dissolution of particle agglomerations. Patterns can be embossed into the chamber wall on its inside. For example, a profiling or embossing with a profile or embossing height of less than 5 mm, preferably less than 2 mm, more preferably less than 1 mm, particularly preferably less than 0.5 mm, can be provided.
  • the chamber wall can also be roughened on the inside, for example by sandblasting, which can have a positive effect on the degree of deagglomeration.
  • a maximum roughness depth of the chamber wall according to DIN EN ISO 25178 can be between 100 and 1000 pm, preferably between 200 and 500 pm.
  • the flow body particularly preferably has a smooth inner surface which can preferably have a roughness depth of less than 500 pm, more preferably less than 200 pm, particularly preferably 100 pm.
  • the chamber wall of the flow body can be closed with the exception of the inlet opening and the outlet opening.
  • the chamber wall can also have a wall section that is detachably connected to the chamber wall in order to release an opening in the chamber wall after the wall section has been released, through which, for example, the interior of the flow body can be cleaned.
  • the flow body can have at least one further opening to enable easy cleaning of the flow body or the flow chamber if required.
  • a cover can be provided to close the further opening.
  • the cover can be connected to the flow body in a form-fitting and/or force-fitting manner, for example via a screw connection or a bayonet connection, in order to achieve easy cleaning of the flow chamber.
  • the cover can in particular be sealed to the flow body via at least one sealing means, so that the flow body, with the exception of the inlet opening and the outlet opening, forms an essentially closed system when the cover is closed.
  • the flow body can be made of one or more parts.
  • the flow chamber can be formed by several chamber walls which close off the flow chamber from the environment when the chamber walls are connected to one another, so that with the exception of at least one inlet opening and at least one outlet opening for particle-containing carrier gas, no particle-carrier gas exchange with the environment is possible.
  • Several chamber walls or also a cover, as described above for closing an opening in a chamber wall can be connected to one another in a form-fitting and/or force-fitting manner, for example via a screw connection or a bayonet connection.
  • automatic cleaning of the flow body can be provided, for example after a certain period of time has elapsed for the carrier gas-particle mixture to flow through the flow body and/or when a certain flow resistance is reached.
  • a suitably designed measuring, control and/or regulating device can be provided.
  • a suction device for sucking a cleaning fluid, for example air
  • a conveying device for transporting a cleaning fluid, for example compressed air
  • at least one fluid reservoir for a cleaning fluid can be provided, for example a compressed air reservoir.
  • connection of a hose to the flow body via the connection area of the flow body for the supply of the carrier gas-particle mixture via the inlet opening into the flow chamber and/or for the discharge of the carrier gas-particle mixture via the outlet opening from the flow chamber enables easy replacement of the lines provided for the introduction or discharge, in particular hoses, which further reduces the cleaning effort.
  • Fig. 1 shows a first embodiment of a deagglomeration device according to the invention for particle separation and dissolution of deagglomerations in a carrier gas-particle mixture in a perspective side view
  • Fig. 2 is a plan view of the deagglomeration device of Fig. 1 ,
  • Fig. 3 is a side view of the deagglomeration device of Fig. 1,
  • Fig. 4 is a perspective partial sectional view of the deagglomeration device of Fig. 1 along the section line IV - IV of Fig. 2,
  • Fig. 5 is a perspective partial sectional view of the deagglomeration device of Fig. 1 along the section line V - V of Fig. 2,
  • Fig. 6 is a cross-sectional view of the deagglomeration device of Fig. 1 along the section line VI - VI of Fig. 3,
  • Fig. 7 is a cross-sectional view of the deagglomeration device of Fig. 1 along the section line VII - VII of Fig. 3,
  • Fig. 8 shows another embodiment of a deagglomeration device according to the invention in a perspective side view
  • Fig. 9 is a plan view of the deagglomeration device from Fig. 8,
  • Fig. 10 is a side view of the deagglomeration device of Fig. 8,
  • Fig. 11 is a cross-sectional view of the deagglomeration device along the section line XI - XI of Fig. 10,
  • Fig. 12 is a cross-sectional view of the deagglomeration device of Fig. 8 along the section line XII - XII of Fig. 10,
  • Fig. 13 is a cross-sectional view of a third embodiment of a deagglomeration device according to the invention with radial supply of a carrier gas-particle mixture
  • Fig. 14 shows the result of the particle analysis when examining cement-containing carrier gas using a deagglomeration device according to the invention integrated into the flow path between a sample application device and a particle measuring device,
  • Fig. 15 shows the result of the particle analysis according to the state of the art when examining cement-containing carrier gas using a hose connection integrated into the flow path between a sample application device and a particle measuring device and
  • Fig. 16 is a perspective view of another embodiment of a deagglomeration device according to the invention for particle separation and dissolution of deagglomerations in a carrier gas-particle mixture, wherein the deagglomeration device has a flow body with an hourglass geometry,
  • Figures 1 to 7 and 8 to 12 show alternative embodiments of a deagglomeration device 1 according to the invention for particle separation and dissolution of particle agglomerations in a carrier gas-particle mixture 2.
  • the carrier gas-particle mixture 2 is, for example, a dispersion of particles in an air stream.
  • Fig. 13 shows a third alternative embodiment of a deagglomeration device 1 with radial supply of a carrier gas-particle mixture 2 into a flow chamber 4 of the deagglomeration device 1.
  • the deagglomeration device 1 has a flow body 3 which delimits a flow chamber 4.
  • the flow body 3 has a curved chamber wall 5.
  • the flow body 3 is designed as a closed system. A gas and/or particle transfer into the flow chamber 4 or out of the flow chamber 4 preferably only takes place via the inlet opening 6 and the outlet opening 7. It is not shown that the flow body 3 can have a further opening that can be closed with a lid in order to enable access to the flow chamber 4 from the outside, for example for cleaning purposes.
  • a carrier gas-particle mixture 2, in particular particle-containing air, can be fed to the flow chamber 4 via the inlet opening 6.
  • the carrier gas-particle mixture 2 After entering via the inlet opening 6, the carrier gas-particle mixture 2 is then transported to the outlet opening 7 due to pressure differences along the inwardly curved chamber wall 5, forming a circular flow or vortex flow, shown schematically in Figures 6, 7 and 12, and then exits the flow chamber 4 via the outlet opening 7.
  • the carrier gas-particle mixture 2 is fed to the flow chamber 4 via the inlet opening 6 tangentially adjacent to the chamber wall 5 and, in the embodiment according to Figures 1 to 7, is also discharged from the flow chamber 4 via the outlet opening 7 tangentially adjacent to the chamber wall 5.
  • the inlet opening 6 and the outlet opening 7 can each be connected tangentially to an inner diameter of the chamber wall 5 of the flow body 3.
  • the tangential inflow or outflow of the carrier gas-particle mixture into or out of the flow chamber 4 leads to an increase in the degree of deagglomeration and is also advantageous in order to prevent undesirable retention or deposits of particles in the area of the inlet opening 6 and/or the outlet opening 7. These deposits can lead to a reduction in the degree of deagglomeration and make cleaning of the deagglomeration device 1 necessary.
  • the flow direction of the carrier gas-particle mixture 2 preferably does not change or only changes slightly at the inlet opening 6 and at the outlet opening 7 at the transition of the flow path to the chamber wall 5. The carrier gas-particle mixture 2 is thus supplied in the flow direction of a circular or vortex flow formed when the carrier gas-particle mixture 2 is passed through the flow body 3.
  • the inlet opening 6 Compared to a radial supply line, the inlet opening 6 has a non-circular, in particular drop-shaped, boundary contour when the carrier gas-particle mixture 2 is supplied tangentially. The same applies to the outlet opening 7. As can be seen from a comparison of Fig. 12 and 13, an inlet arc length 8 is increased when the carrier gas-particle mixture 2 is supplied tangentially (Fig. 12) compared to an inlet arc length 9 when the carrier gas-particle mixture 2 is supplied radially (Fig. 13).
  • the carrier gas-particle mixture 2 is discharged from the flow chamber 4 in a vertical or gravity direction, preferably axially to a central longitudinal axis Y of the flow body 3 or the flow chamber 4, in contrast to the embodiment shown in Figures 1 to 7.
  • an axial connection of the outlet opening 7 to the flow chamber 4 is accordingly provided.
  • the carrier gas-particle mixture 2 is sucked in or blown in tangentially and brought onto a circular path. By tapering the adjacent cone, the rotational speed decreases, so that particles are thrown against the cone walls by centrifugal forces and thus slowed down, which leads to deagglomeration.
  • the flow body 3 defines a cylindrical flow chamber 4.
  • the chamber wall 5 of the flow body 3 is preferably formed in one piece and can consist of a polymer material.
  • the flow body can be made of polymer materials or of metal, for example stainless steel.
  • the chamber wall 5 has a first axial wall section 10 designed as a hollow cylinder and an upper first flat radial wall section 11 and a lower second flat radial wall section 12.
  • the inner surface of the first wall section 10 forms an inner shell surface 13 and delimits the cylindrical flow chamber 4 in the radial direction.
  • the flat radial wall sections 11, 12 form inner base surfaces 14, 15 and delimit the flow chamber 4 in the axial direction upwards and downwards.
  • the inlet opening 6 and the outlet opening 7 are formed in the first wall section 10, which is designed as a hollow cylinder.
  • the first wall section 10 has two molded connection areas 16, 17 designed as pipe sockets for connection to a hose line or a pipe.
  • the connection areas 16, 17 are connected tangentially to the inner diameter of the chamber wall 5.
  • the carrier gas-particle mixture 2 is fed into and discharged from the flow chamber 4 via hoses or pipes (not shown) and the connection areas 16, 17.
  • the flow body 3 delimits a flow chamber 4, which has an upper inlet cylinder section 18 and a lower cone section 19.
  • the chamber wall 5 of the flow body 3 is again preferably formed in one piece and can consist of a polymer material.
  • the chamber wall 5 has a first axial wall section 20 designed as a hollow cylinder and a second axial wall section designed as a hollow cone
  • the flat wall section 22 is provided.
  • the inner surface of the first wall section 20 forms a jacket surface 23 and delimits the inlet cylinder section 18 of the flow chamber 4.
  • the inner surface of the second wall section 21 forms a conical jacket surface 24 and delimits the lower conical section 19 of the flow chamber 4.
  • the inlet opening 6 is formed in the first wall section 20 designed as a hollow cylinder.
  • the first wall section 20, designed as a hollow cylinder, has a molded connection area 26 designed as a pipe socket for connection to a hose line or a pipe.
  • the connection area 26 opens tangentially into the flow chamber 4 at the inlet opening 6.
  • the hollow cone formed second wall section 21 merges at its lower end into a molded connection area 27 designed as a pipe socket for connection to a hose line or a pipe.
  • the supply and discharge of the carrier gas-particle mixture 2 into and out of the flow chamber 4 takes place via hoses or pipes and the connection areas 26, 27.
  • a tangential supply and an axial discharge of the carrier gas-particle mixture 2 is thus provided centrally to the central axis Y of the flow chamber 4.
  • the supply connection areas 16, 26 are connected and/or can be connected to a sample feed device via a hose line or a pipe.
  • the hose line or the pipe can end in the area of the sample feed device.
  • the discharge connection areas 17, 27 can be connected and/or can be connected to a particle measuring device, in particular a particle measuring volume, via a hose line or a pipe. This shows the flow path from the sample feed to the particle measuring device. It is understood that other components, functional units and lines can be integrated in the flow path from the sample feed to the particle measuring device.
  • the discharge connection area 17, 27 can be connected and/or connectable to a suction device downstream of the deagglomeration device 1 for suctioning the carrier gas-particle mixture through the flow chamber 4.
  • a conveying device for conveying the carrier gas-particle mixture 2 which is integrated into the flow path in front of the flow chamber 4 in the flow direction, preferably downstream of a sample feed device in the flow direction.
  • the supply connection area 16, 26 can be fluidically connected to a vibrating trough, so that it is possible to suck in a particle sample together with ambient air as a carrier gas in the area of the vibrating trough and then transport it into the flow chamber 4. The vibrating trough is then part of the sample feed device.
  • the chamber wall 5, particularly in the area of the axial wall sections 10, 20, 21 designed as hollow cylinders or hollow cones, can have an embossing on the inside or be roughened, for example by sandblasting the surface.
  • embossing and/or roughening the surface on the inside of the chamber wall 5 higher shear forces can be generated in order to to increase the degree of deagglomeration.
  • the embossing height can preferably be less than 5 mm, more preferably less than 2 mm, more preferably less than 1 mm.
  • the maximum roughness depth of the chamber wall 5 on its inside can be between 100 and 1000 pm, preferably less than 200 pm, according to DIN EN ISO 25178.
  • the flow body 4 is free of built-in components and the chamber wall 5 on its inside is free of projections. This prevents the formation of particle deposits on projections and built-in components. In principle, however, such projections and/or built-in components can also be provided in order to increase shear forces.
  • Figure 14 shows the result of the particle analysis by means of laser diffraction using a sync analyzer from Microtrac (DE) as a particle measuring device.
  • Cement-containing air was measured as the carrier gas-particle mixture 2.
  • the measurement was carried out by evaluating the images obtained by image capture; the number and a relative particle size (not calibrated) are output by the particle measuring device using an algorithm.
  • the dispersion pressure was 20 PSI.
  • the average gas velocity was 35 m/s, which corresponds to a gas flow of 180 L/min.
  • a deagglomeration device 1 of the type shown in Figs. 1 - 7 was integrated into the flow path between a vibrating trough as a sample feed device, through which the carrier gas-particle mixture was sucked in, and the particle measuring device.
  • the deagglomeration device 1 has no or only a very small dead volume.
  • the flow chamber 4 there is no significant change in direction (gas phase and particle phase) when entering the flow chamber 4 due to a corresponding arrangement of the inlet opening 6 and the outlet opening 7.
  • the particles are held for different lengths of time in the buffer volume formed by the flow chamber 4 due to the formation of the circular or vortex flow and are distributed over the measurement time.
  • Figure 15 shows the result of the particle analysis with the same measurement setup and the same carrier gas-particle mixture, whereby the flow from the vibrating trough as sample feed device to the particle measuring device was only carried out via a hose line.
  • a deagglomeration device 1 was not used.
  • a qualitative comparison of Figures 14 and 15 makes it clear that the particles detected during image acquisition according to Figure 14 are distributed over a larger number of measurement images using the deagglomeration device 1 according to the invention. This shows that a greater resolution of particle agglomerations can be achieved by using the deagglomeration device 1 according to the invention.
  • Fig. 16 shows a further embodiment of a deagglomeration device 1, which has a flow body 3, the inner surface of which is formed by rotation of a generating curve about an axis of rotation and which has the geometry of an hourglass.

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  • Physics & Mathematics (AREA)
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Abstract

L'invention concerne un dispositif de désagglomération (1) servant à individualiser des particules et dissoudre des agglomérations de particules dans un mélange de particules de gaz porteur (2), conçu pour être utilisé dans un dispositif de mesure de particules comprenant un corps d'écoulement traversant (3), qui délimite une chambre d'écoulement traversant (4), pour le mélange de particules de gaz porteur (2), le corps d'écoulement traversant (3) ayant une paroi de chambre incurvée (5) afin de générer un écoulement circulaire et/ou un écoulement turbulent du mélange de particules de gaz porteur (2) lorsqu'il s'écoule sur la paroi de chambre (5), la paroi de chambre (5) est équipée d'une ouverture d'entrée (6) pour un mélange de particules de gaz porteur (2) et d'une ouverture de sortie (7) pour le mélange de particules de gaz porteur (2), et le reste du corps d'écoulement traversant (3) est fermé et/ou peut être fermé par rapport à l'environnement. Un mélange de particules de gaz porteur (2) peut être apporté à la chambre d'écoulement traversant (4) par l'intermédiaire de l'ouverture d'entrée (6), et le mélange de particules de gaz porteur (2) peut être transporté de l'ouverture d'entrée (6) à l'ouverture de sortie (7), formant ainsi un écoulement circulaire le long de la paroi de chambre (5) du corps d'écoulement traversant (2), et peut être évacué hors de la chambre d'écoulement traversant (4) par l'intermédiaire de l'ouverture de sortie (7).
EP24702490.4A 2023-01-24 2024-01-24 Dispositif de désagglomération et dispositif de mesure de particules Pending EP4643112A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102023000209 2023-01-24
DE102023102333 2023-01-31
DE102023110688.0A DE102023110688A1 (de) 2023-01-24 2023-04-26 Deagglomerationsvorrichtung und Anordnung mit einer Deagglomerationsvorrichtung und mit einer Partikelmesseinrichtung
PCT/EP2024/051660 WO2024156752A1 (fr) 2023-01-24 2024-01-24 Dispositif de désagglomération et dispositif de mesure de particules

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FR2976574B1 (fr) * 2011-06-17 2013-05-31 Rhodia Operations Composition a base d'oxydes de cerium, de zirconium et d'une autre terre rare a reductibilite elevee, procede de preparation et utilisation dans le domaine de la catalyse.
JP2014085320A (ja) * 2012-10-26 2014-05-12 Azbil Corp 粒子濃縮装置及び粒子検出装置
GB201700727D0 (en) * 2017-01-16 2017-03-01 Teva Pharma Inhalers and airflow adaptors therefor
CN111751170A (zh) * 2020-07-24 2020-10-09 北京大学 一种便携大流量液体式生物气溶胶旋风采样器

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