EP0611928A1 - Refroidissement de produits en morceaux ou granulaires - Google Patents

Refroidissement de produits en morceaux ou granulaires Download PDF

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Publication number
EP0611928A1
EP0611928A1 EP94101996A EP94101996A EP0611928A1 EP 0611928 A1 EP0611928 A1 EP 0611928A1 EP 94101996 A EP94101996 A EP 94101996A EP 94101996 A EP94101996 A EP 94101996A EP 0611928 A1 EP0611928 A1 EP 0611928A1
Authority
EP
European Patent Office
Prior art keywords
tube
lumpy
low
liquefied gas
granular material
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.)
Withdrawn
Application number
EP94101996A
Other languages
German (de)
English (en)
Inventor
Bernd Klane
Martin Blanke
Dieter Rebhan
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.)
Linde GmbH
Original Assignee
Linde 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
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP0611928A1 publication Critical patent/EP0611928A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • F25D3/11—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air with conveyors carrying articles to be cooled through the cooling space

Definitions

  • the invention relates to a method and a device for cooling lumpy or granular material.
  • Known methods of this type are used, for example, to freeze food, to embrittle or solidify industrial products which are then to be separated, crushed or ground.
  • the shredding and grinding processes are facilitated by the embrittlement of the products caused by the cooling, and the shredding and grinding machines can be operated with a lower power requirement.
  • a preliminary cooling of the work parts is also necessary for cold forming processes such as the cold shrinking of steel parts.
  • cooling devices use conveying means which transport the goods to be cooled through a cryogenic liquid and thereby bring the goods directly into contact with the cooling medium for a defined time.
  • conveying means which transport the goods to be cooled through a cryogenic liquid and thereby bring the goods directly into contact with the cooling medium for a defined time.
  • cooling devices of this type with indirect cooling. Screw conveyors, conveyor belts, chain conveyors or transport baskets or chambers are used as conveying means, which are filled with the goods to be cooled.
  • piece goods are transported by means of a chain conveyor through a bath with a low-boiling liquefied gas, or in DE-41 09 900 the goods are conveyed through such a bath in chambers, the walls of which are partially designed as grids.
  • a disadvantage of such known cooling devices is the fact that the conveying means come into direct or indirect contact with the cryogenic medium. As a result, the funds are cooled down considerably and must therefore be made of cold-resistant materials. The constant change in temperature and the risk of embrittlement greatly reduce the service life of the materials. Furthermore, the storage of the moving parts in the cryogenic areas of the plant causes problems. Finally, the freezing of air humidity and dirt with subsequent icing of the moving conveying parts and the additional heat input into the cryogenic medium by the conveying means themselves are undesirable.
  • the object of the present invention is therefore to provide a method and a device suitable for this, by means of which lumpy or granular material can be cooled on its transport route without having to accept the disadvantages mentioned.
  • This object is achieved in that the lumpy or granular material is continuously filled into a tube, cooled in at least part of this tube with the aid of a low-boiling liquefied gas and removed at the outlet opening of the tube.
  • funding is completely dispensed with. Due to the continuous filling of the tube, pressure is exerted on material already in the tube, through which it is transported further until it is finally removed at the other end of the tube at its outlet opening.
  • the material inside is cooled with the help of a low-boiling liquefied gas.
  • This cooling can be carried out by direct or indirect heat exchange with the liquefied gas, as required.
  • this good is allowed to come into direct contact with the liquefied gas without damage, it is advantageous to fill this good according to the invention continuously into a pipe containing at least partly a low-boiling liquefied gas, through which the good is transported, whereby it cools down .
  • the tube can be bent in a U-shape and the plane thus formed is perpendicular to the support surface.
  • the material is then introduced into the tube from above, a cryogenic liquefied gas being introduced into the lower bent part of the tube.
  • the loading can take place with the aid of a press ram through which the material is pressed into the tube, as a result of which cooled material exits again at the outlet opening of the tube.
  • a certain cross-sectional geometry of the pipe can be used.
  • cylindrical lumpy goods for example, one Select a square pipe cross-section that is adapted to the cross-sectional dimensions of the goods. The material then passes through the pipe piece by piece, the space to the pipe wall being just large enough to prevent canting.
  • inert gas as the low-boiling liquefied gas is particularly recommended. If the cooled lumpy or granular material is comminuted or ground, it is also advantageous to draw off the vaporized inert gas which arises during the conveying and cooling of the material and to use it in the comminution or grinding process to inert the atmosphere there. When shredding, for example used batteries or spray cans, chemically reactive and highly flammable substances can escape, which could explode in air or ignite. These dangers are eliminated in an inert gas atmosphere.
  • evaporated low-boiling gas is used to pre-cool the lumpy or granular material.
  • the gaseous nitrogen can absorb more than the same amount of heat until the nitrogen reaches room temperature.
  • This cooling capacity can be used by the cold nitrogen gas pre-cooling the lumpy or granular material on the conveying path to the cooling device according to the invention or after-cooling, for example, to a comminution device.
  • At least that part of the pipe which contains the low-boiling liquefied gas should be insulated when the goods are directly cooled.
  • the temperature of the lumpy or granular material can be regulated via the throughput of the material through the pipe. Since the pipe is filled continuously, a larger filling quantity per unit of time corresponds to a higher transport speed and thus a shorter dwell time in the part of the pipe in which the material is cooled directly or indirectly with the cryogenic liquefied gas.
  • the temperature of the goods in direct cooling can be regulated via the filling quantity of the low-boiling liquefied gas in the pipe.
  • the larger the filling quantity the larger the part of the pipe filled with liquefied gas, i.e. the longer the cooling section.
  • a suitable device for carrying out the method according to the invention essentially consists of a tube which is suitable for receiving the lumpy or granular material and is of U-shaped design, the lower curved part of the tube being in contact with a low-boiling liquefied gas.
  • a bath with the liquefied gas can be used, through which the lower bent part of the pipe is led.
  • the liquefied gas can be filled directly into a heat-insulated pipe.
  • the lower bent part of the U-shaped tube is immersed in a bath with a low-boiling liquefied gas and has inflow openings for the liquefied gas.
  • the level of the low-boiling liquefied gas in the bath can be easily checked and regulated to a constant value.
  • the material to be cooled is filled into the tube from above until the lower bent part of the U-shaped tube is fully loaded with the goods. Continuous filling creates a pressure that conveys the material through the lower bent part of the tube and brings it into direct or indirect heat exchange with the low-boiling liquefied gas.
  • the cooled material exits at the outlet opening of the tube.
  • a press ram is then attached to the inlet opening of the tube. This presses the goods a certain distance into the interior of the pipe, whereupon goods are again filled into the inlet opening.
  • the cross-sectional area of the pipe in particular in the case of lumpy goods, it can be advantageous to adapt the cross-sectional area of the pipe to that of the good, so that the good is conveyed through the pipe piece by piece.
  • the space between the surface of the good and the inner wall of the pipe is dimensioned such that sufficient liquid gas comes into contact with the good when directly cooled, but jamming and jamming of the good in the pipe are prevented.
  • the tube In order to avoid jamming of the goods in the tube, it can also be appropriate to design the tube with a cross section widening towards the outlet opening. Baffles in the interior of the tube can also be provided.
  • the drawing shows schematically a device suitable for direct cooling of lumpy material according to the invention.
  • a U-shaped tube 2 is guided with its lower bent part through a bath 8 with liquefied nitrogen 3. This part also has inflow openings 4 through which a liquid exchange can take place between the pipe interior and the bath 8.
  • the bathroom 8 is thermally insulated.
  • the fill level is kept constant by an appropriate control unit.
  • the lumpy material 1 is filled into the tube 2 at the inlet opening 5.
  • a press ram 7 supports the transport of the goods 1 through the bent tube 2.
  • the cooled goods 1 are removed at the outlet opening 6.
  • the residence time of the material 1 in the bath 8 with liquefied nitrogen 3 can be set. Evaporating nitrogen rises into the interior of the tube and provides for pre-cooling and post-cooling of the material 1.
  • the cross-sectional area of the tube 2 is adapted to that of the lumpy material in order to reduce the risk of canting, which could lead to blockages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
EP94101996A 1993-02-16 1994-02-09 Refroidissement de produits en morceaux ou granulaires Withdrawn EP0611928A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934304675 DE4304675A1 (de) 1993-02-16 1993-02-16 Kühlung stückigen oder körnigen Gutes
DE4304675 1993-02-16

Publications (1)

Publication Number Publication Date
EP0611928A1 true EP0611928A1 (fr) 1994-08-24

Family

ID=6480602

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94101996A Withdrawn EP0611928A1 (fr) 1993-02-16 1994-02-09 Refroidissement de produits en morceaux ou granulaires

Country Status (4)

Country Link
EP (1) EP0611928A1 (fr)
CN (1) CN1095156A (fr)
CZ (1) CZ268593A3 (fr)
DE (1) DE4304675A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667500A1 (fr) * 1994-02-14 1995-08-16 The BOC Group plc Congélateur à immersion
DE10132072C1 (de) * 2001-07-05 2002-10-10 Gerhard Auer Verfahren und Vorrichtung zur direkten Kühlung von Pigmenten nach einer Dampfstrahlmahlung
WO2003004954A1 (fr) 2001-07-05 2003-01-16 Kerr-Mcgee Pigments International Gmbh Procede de refroidissement direct de solides en fines particules

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19717006A1 (de) * 1997-04-23 1998-10-29 Daimler Benz Ag Verfahren zur Kühlung von stückigem oder körnigem Gut sowie Vorrichtung zur Durchführung des Verfahrens
DE102007030893A1 (de) * 2007-07-03 2009-01-08 Cryotherm Gmbh & Co. Kg Führungsstruktur zum Führen von Bauteilen durch ein Kühlbad
DE102011078948B4 (de) * 2011-07-11 2014-09-25 Coperion Gmbh Wärmetauschersystem für Schüttgut sowie Verfahren zum Betrieb eines derartigen Wärmetauschersystems
CN107490227B (zh) * 2016-11-02 2020-02-14 宝沃汽车（中国）有限公司 一种液氮冷却设备

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487821A (en) * 1944-06-10 1949-11-15 Linde Air Prod Co Method of and apparatus for cooling and dispensing objects
US2525261A (en) * 1946-09-30 1950-10-10 James P Henderson Refrigerated ball dispenser
US2534334A (en) * 1945-06-30 1950-12-19 Linde Air Prod Co Cold treating method and apparatus
US2552029A (en) * 1946-04-10 1951-05-08 Union Carbide & Carbon Corp Cold treating machine
CH562056A5 (fr) * 1972-09-19 1975-05-30 Linde Ag
EP0501495A1 (fr) * 1991-03-01 1992-09-02 Linde Aktiengesellschaft Appareil de refroidissement de produits en morceaux ou granulaires

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487821A (en) * 1944-06-10 1949-11-15 Linde Air Prod Co Method of and apparatus for cooling and dispensing objects
US2534334A (en) * 1945-06-30 1950-12-19 Linde Air Prod Co Cold treating method and apparatus
US2552029A (en) * 1946-04-10 1951-05-08 Union Carbide & Carbon Corp Cold treating machine
US2525261A (en) * 1946-09-30 1950-10-10 James P Henderson Refrigerated ball dispenser
CH562056A5 (fr) * 1972-09-19 1975-05-30 Linde Ag
EP0501495A1 (fr) * 1991-03-01 1992-09-02 Linde Aktiengesellschaft Appareil de refroidissement de produits en morceaux ou granulaires
DE4106599A1 (de) * 1991-03-01 1992-09-03 Linde Ag Verfahren zur kuehlung von stueckigem oder koernigem gut

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667500A1 (fr) * 1994-02-14 1995-08-16 The BOC Group plc Congélateur à immersion
US5522237A (en) * 1994-02-14 1996-06-04 The Boc Group Plc Immersion freezer
DE10132072C1 (de) * 2001-07-05 2002-10-10 Gerhard Auer Verfahren und Vorrichtung zur direkten Kühlung von Pigmenten nach einer Dampfstrahlmahlung
WO2003004954A1 (fr) 2001-07-05 2003-01-16 Kerr-Mcgee Pigments International Gmbh Procede de refroidissement direct de solides en fines particules
US7003965B2 (en) 2001-07-05 2006-02-28 Kerr-Mcgee Pigments International Gmbh Method for directly cooling fine-particle solid substances

Also Published As

Publication number Publication date
CZ268593A3 (en) 1994-08-17
DE4304675A1 (de) 1994-08-18
CN1095156A (zh) 1994-11-16

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