Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
• • 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
  • B01F25/40—Static mixers
  • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
  • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
  • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
  • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
  • B01F25/43161—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod composed of consecutive sections of flat pieces of material
• • 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
  • B01F35/90—Heating or cooling systems
  • B01F35/93—Heating or cooling systems arranged inside the receptacle
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
  • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
  • F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
  • F28D2021/0052—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for mixers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
  • F28D2021/0098—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for viscous or semi-liquid materials, e.g. for processing sludge

Definitions

• the invention relates to a flow channel for a mixer-heat exchanger, which flow channel is tubular with a longitudinal axis and a circular in cross-section inner surface with an inner diameter and at least one mixing insert a length with a plurality of parallel to the longitudinal axis of the flow channel over the length of the mixing insert guided tubes having an inner diameter and arranged with a plurality of crossed, with the longitudinal axis of the flow channel at an angle including web plates of a width, wherein the web plates are arranged in two intersecting, a plurality of parallel planes with an intermediate spacing plane shares, and a third, a plurality of parallel planes having a width of the web plates corresponding spacing having plane group which intersects two intersecting plane shares at right angles, wherein the intersection lines of the planes of two intersecting planes of planes form with the planes of the third layer family longitudinal edges of the web plates arranged alternately between adjacent planes of the third group of planes in the planes of the two intersecting planes of planes, wherein the tubes are guided
• a flow channel of the aforementioned type is known from EP 1 067 352 B1.
• the invention has for its object to provide a flow channel of the type mentioned above, which leads to a significant improvement in the heat exchange, especially in highly viscous liquids and the construction o allows a compact heat exchanger.
• each mixing insert has at least 28 web plates crossed in pairs, the ratio of the web width to the inner diameter of the flow channel is at least 0.25, the ratio of the length of the mixing insert to the inner diameter of the flow channel is at least 0.4 and the angle of the web plates to the longitudinal axis the flow channel 30 ° to 60 ° and the ratio of the distance between adjacent planes of the intersecting, the web plates having planes level to the inner diameter of the flow channel o at most 0.3 and the inner diameter of the tubes is less than 6.
• the ratio of the distance between adjacent electrodes is preferably NEN of the intersecting, the web plates having planes level to the inner diameter of the tubes less than 4, in particular less than 3.
• the mentioned Nusselt number is a dimensionless measure from the theory of similarity of heat transfer, which measures the improvement of heat transfer from a surface, if one compares the actual conditions with the conditions in which only heat conduction through a dormant layer would occur. Surprisingly, falls below the ratio of the above-defined land distance to the inner diameter of the tubes below a certain value, a hitherto unexplained further improvement of the heat transfer. This phenomenon can be seen in FIG. 5.
• the crossed web plates can have a different angle to the longitudinal axis of the flow channel. However, an equal angle is preferred.
• the planes of the two intersecting layers of planes can have different distances between them. However, an equal spacing is preferred.
• the planes of the two intersecting planes of planes can have a slight curvature in the longitudinal axis of the flow channel.
• the planes of the third group of planes may have a different intermediate distance, i.
• the web plates can be different widths. However, an equal spacing of the planes and, accordingly, a same width of all web plates is preferred.
• the mixing inserts in the flow channel are arranged one behind the other, wherein the adjacent mixing inserts are rotated by an angle of 90 ° about the longitudinal axis of the flow channel against each other.
• the freely positionable tubes may be brazed or welded to the web plates or the web plates may have shrunk to the tubes.
• a second component via at least one tube with at least one hole for a liquid outlet, preferably over several pipes with several Reren holes, a first, flowing in the flow channel component are mixed.
• mixing inserts can be arranged one behind the other with distances of at most three times the length of a mixing insert, with the mixing inserts being rotated against each other by an angle of 90 ° according to the distances.
• the flow channel according to the invention is suitable as a static mixer.
• 1 is a side view of two adjacent mixing inserts for a flow channel.
• FIG. 2 shows an oblique view of a mixing insert
• FIG 3 is a view of a mixing insert in a flow channel in the direction of the longitudinal axis of the flow channel.
• Fig. 5 shows the dependence of the Nusselt number on the ratio of the web distance to the tube inner diameter. Description of exemplary embodiments
• Two mixing inserts 10, 12 having a length L and pointing in their longitudinal axis m for media flowing in a flow channel, according to FIG. 2, have a tube bundle 14 arranged at 188 parallel to the longitudinal axis m over the entire length Length L extending tubes 16 on.
• Each mixing insert 10, 12 has a plurality of intersecting web plates 18 A, 18 B.
• the web plates 18 A, 18 B all have the same width b and lie in mutually parallel with the same distance a arranged planes EA, EB, the two intersecting plane shares A, B form.
• the planes EA of the plane group A include with the longitudinal axis m in each case an equal angle ⁇ A, ⁇ B of 45 °.
• Layers EC of a third group of planes C arranged parallel to one another with a spacing b corresponding to the width b of the web plates 18 A, 18 B extend parallel to the longitudinal axis m and intersect the planes EA, EB of the two intersecting planes A, B at right angles.
• the lines of intersection of the planes EA, EB of the two intersecting planes A, B form the planes EC of the third plane group C longitudinal edges 20 A, 20 B alternately between adjacent planes EC in the planes EA, EB of the two intersecting planes A, B arranged web plates 18 A, 18 B.
• the adjoining mixing inserts 10, 12 are arranged rotated by an angle of 90 ° about its longitudinal axis m against each other.
• Fig. 3 the mutually rotated by an angle of 90 ° about its longitudinal axis m mixing inserts 10, 12 in a tubular flow channel 22 having an inner circumferential surface 24 with a circular cross-section, an inner diameter Di and a pipe or Strömungskanall Kunststoffsachse x.
• the longitudinal axes m of the mixing inserts 10, 12 lie in the longitudinal direction.
• All web plates 18 A, 18 B extend within each mixing insert 10, 12 via their respective maximum through the end faces of the mixing inserts 10, 12 and through the inner wall of the flow channel, maximum length, the contour of the web plates 18 A, 18 B the circular Cross-section of the flow channel 22 is adapted so that the web plates 18 A, 18 B adjoin the inner circumferential surface 24 of the flow channel 22 with a small clearance.
• the tubes 16 pass through the web plates 18 A, 18 B via openings arranged in these, which have according to the angle between the web plate 18 A, 18 B and tube 16 an elliptical edge boundary.
• the tubes 16 are secured in the region of the openings via a soldering or welding point on the web plates 18 A, 18 B.
• the web plates 18 A, 18 B are connected to each other at their intersections via soldering or welding points.
• the individual mixing inserts 10, 12 are prefabricated by the crossed arrangement of the corresponding number of web plates 18 A, 18 B.
• the prefabricated mixing inserts 10, 12 are rotated by 90 ° against each other in their longitudinal axis m strung together.
• the tubes 16 are pushed parallel to the longitudinal axis m through the openings in the web plates 18 A, 18 B and secured thereto.
• the insert thus manufactured is subsequently inserted into the flow channel.
• FIG. 5 graphically shows the results of measurements of the heat transfer at three differently constructed flow channels S1, S2, S3 as Nusselt number (Nu) as a function of the ratio between web distance (a) / inner pipe diameter (di) at a constant reference Peclete number (Pe ref ) shown.
• Nusselt number Nu
• Pe ref Peclete number
• the web distance (a) results from the measured values from the ratio between the web distance (a) / inner pipe diameter (di) in FIG. 5. From FIG. 5, the surprising effect that the heat transfer suddenly rises unexpectedly when falling below a certain ratio is clear seen.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Dispersion Chemistry (AREA)
• Fluid Mechanics (AREA)
• Separation By Low-Temperature Treatments (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)

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Publications (2)

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• 2008
  • 2008-05-20 DE DE502008002619T patent/DE502008002619D1/de active Active
  • 2008-05-20 EP EP08748356A patent/EP2150765B1/fr active Active
  • 2008-05-20 US US12/601,119 patent/US8628233B2/en active Active
  • 2008-05-20 WO PCT/CH2008/000226 patent/WO2008141472A1/fr active Application Filing
  • 2008-05-20 AT AT08748356T patent/ATE498810T1/de active

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