EP0047914A1 - Vorrichtung zum Entziehen von Wärme aus einem hygroskopischen körnigen Material mit einer Temperatur unter 100 Grad Celsius - Google Patents

Vorrichtung zum Entziehen von Wärme aus einem hygroskopischen körnigen Material mit einer Temperatur unter 100 Grad Celsius Download PDF

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Publication number
EP0047914A1
EP0047914A1 EP81106805A EP81106805A EP0047914A1 EP 0047914 A1 EP0047914 A1 EP 0047914A1 EP 81106805 A EP81106805 A EP 81106805A EP 81106805 A EP81106805 A EP 81106805A EP 0047914 A1 EP0047914 A1 EP 0047914A1
Authority
EP
European Patent Office
Prior art keywords
water
grains
sand
heat
pulverulent 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.)
Granted
Application number
EP81106805A
Other languages
English (en)
French (fr)
Other versions
EP0047914B1 (de
Inventor
Serge Alquier
Louis Berthod
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.)
Alstom SA
Original Assignee
Alsthom Atlantique SA
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 Alsthom Atlantique SA filed Critical Alsthom Atlantique SA
Priority to AT81106805T priority Critical patent/ATE11017T1/de
Publication of EP0047914A1 publication Critical patent/EP0047914A1/de
Application granted granted Critical
Publication of EP0047914B1 publication Critical patent/EP0047914B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C3/00—Other direct-contact heat-exchange apparatus
    • F28C3/10—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material
    • F28C3/12—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid
    • F28C3/16—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid the particulate material forming a bed, e.g. fluidised, on vibratory sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C3/00—Other direct-contact heat-exchange apparatus
    • F28C3/10—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material
    • F28C3/12—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid
    • F28C3/14—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid the particulate material moving by gravity, e.g. down a tube

Definitions

  • the invention relates to a device for extracting heat from a hydrophilic pulverulent material below 100 ° C.
  • This material can for example be foundry sand which has just been used and has been cooled to 100 ° C. by spraying with water, or sand which has been dried with a flame and maintains a temperature of 100 ° C. To continue handling this material it is desirable to start by cooling it from 100 ° C to 40 ° C.
  • the heat transfer coefficients are quite low, of the order of a few tens of kcal / hm 2. ° C while the transfer coefficients by direct evaporation and condensation of water are of the order 1000 kcal / hm 2. ° C.
  • the sand to be cooled is sand which has been dried in a rotary kiln, it is desirable to cool it while obtaining a sand at 40 C perfectly dry for its use in a foundry mold or for its shipment . In addition, it is often useful to recover the heat from the sand.
  • the object of the present invention is to provide a device for extracting heat from a hydrophilic pulverulent material below 100 ° C. enabling a cool and dry material to be obtained in a simple manner and for recovering the heat. extracted.
  • the invention therefore relates to a device for extracting heat from a hydrophilic pulverulent material below 100 ° C, characterized in that it comprises means for turbulent movement of the material, means for spraying water on the surface of this moving material in an amount just necessary for the desired extraction of heat by subsequent evaporation of the water removed from the grains, and means for circulating a gas upon contact with the moving material so that the deposited water evaporates before contact with neighboring grains has been able to create a possibility of aggregation of these grains, said gas ensuring the evacuation of the water vapor thus produced.
  • the means for setting in motion the pulverulent material comprise a shaker conveyor, said conveyor carrying a succession of ramps, the shaking of this conveyor being chosen to successively climb all these ramps by the grains leaving them fall down each time they have reached the top of a ramp, the means for spraying the water being arranged in the vicinity of the zones where the grains fall from the top of a ramp.
  • the water is sprayed so that the droplets formed have diameters substantially between 60% and 30% of the average diameter of the grains of the material.
  • the single figure is a schematic view of a preferred embodiment of the invention.
  • the quantity of water just necessary for cooling is uniformly sprayed on the surface of the sand, this quantity corresponding to approximately 550 calories / kg of evaporated water.
  • Evaporation of the water is ensured by a low gas circulation, possibly under reduced pressure, which decreases the partial pressure of water vapor at the level of each grain and thus allows evaporation before the grains have been able to agglomerate.
  • the gas also allows evacuation by entrainment of the water vapor produced.
  • a uniform spraying of water on the surface of the sand is necessary and, preferably, 3% of cold water is injected by weight relative to the sand.
  • the device shown in the figure includes a hopper 2 for the supply of pulverulent material, for example hot foundry sand.
  • Sand falls on shaker conveyor comprising a table 4 set in motion by a mechanism 6 of known type. On this table are arranged three ascending ramps 8, 10 and 12 that the sand successively climbs under the action of the tremors applied by the mechanism 6.
  • a water sprayer In the vicinity of each of the ramp tops is arranged a water sprayer, respectively (16), 18) and (20), which directs the water onto the sand in the areas where the layers of sand mix in the vicinity from the top of the ramp, and where the sand falls.
  • shaker conveyor can be horizontal, inclined or helical.
  • the gas which, as indicated above, ensures evaporation is preferably air; it is sent, via a pipe 21, preferably in the opposite direction to that of the sand, and meets each grain which falls from the ramps, thus ensuring the evaporation of the water and the transport of the water vapor produced.
  • the air taken up in the vicinity of the hopper 2 is then hot and humid; it is sent to a condenser 22 which recovers the heat.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Tea And Coffee (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Drying Of Solid Materials (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
EP81106805A 1980-09-04 1981-09-01 Vorrichtung zum Entziehen von Wärme aus einem hygroskopischen körnigen Material mit einer Temperatur unter 100 Grad Celsius Expired EP0047914B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81106805T ATE11017T1 (de) 1980-09-04 1981-09-01 Vorrichtung zum entziehen von waerme aus einem hygroskopischen koernigen material mit einer temperatur unter 100 grad celsius.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8019093A FR2489489A1 (fr) 1980-09-04 1980-09-04 Procede d'extraction de la chaleur d'un materiau pulverulent hydrophile au-dessous de 100 oc
FR8019093 1980-09-04

Publications (2)

Publication Number Publication Date
EP0047914A1 true EP0047914A1 (de) 1982-03-24
EP0047914B1 EP0047914B1 (de) 1985-01-02

Family

ID=9245649

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81106805A Expired EP0047914B1 (de) 1980-09-04 1981-09-01 Vorrichtung zum Entziehen von Wärme aus einem hygroskopischen körnigen Material mit einer Temperatur unter 100 Grad Celsius

Country Status (9)

Country Link
US (1) US4377937A (de)
EP (1) EP0047914B1 (de)
AT (1) ATE11017T1 (de)
BR (1) BR8105611A (de)
CA (1) CA1162842A (de)
DE (1) DE3168042D1 (de)
ES (1) ES8206823A1 (de)
FR (1) FR2489489A1 (de)
MA (1) MA19259A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2674320B1 (fr) * 1991-03-21 1999-01-29 Lair Liquide Procede et dispositif de congelation
NZ250270A (en) * 1992-12-29 1995-07-26 Boc Group Inc Freezing food using liquid refrigerant: turbulent flow of refrigerant induced in trough type conveyor
FR2701552B1 (fr) * 1993-02-10 1995-03-24 Air Liquide Dispositif de congélation à couloir vibrant.
DE202010010804U1 (de) * 2010-07-29 2011-11-02 Lintec Gmbh & Co. Kg Mobile Vorrichtung zur Betonherstellung mit Kühlung von Schüttgut

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE942271C (de) * 1952-10-17 1956-05-03 Metallgesellschaft Ag Verfahren zum kontinuierlichen Kuehlen von extrahiertem Gut
US2863190A (en) * 1954-10-20 1958-12-09 Fischer Ag Georg Method and means for cooling granular masses containing evaporable liquid
US3161485A (en) * 1957-12-20 1964-12-15 Fischer Ag Georg Sand cooling plant
US3172177A (en) * 1964-02-05 1965-03-09 Herbert C Brauchla Continuous method of preparing foundry sand
US3205543A (en) * 1963-05-27 1965-09-14 Rex Chainbelt Inc Process and apparatus for cooling foundry sand on a vibratory conveyor
DE2540124A1 (de) * 1974-10-10 1976-04-22 Gen Kinematics Corp Wirbelschicht-kuehl- und mischvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1844782A (en) * 1926-10-30 1932-02-09 Krupp Fried Grusonwerk Ag Apparatus for cooling loose material
US3089653A (en) * 1961-09-20 1963-05-14 Dundee Cement Co Hot clinker conveying and cooling apparatus
DE1483123A1 (de) * 1965-01-26 1969-01-23 Peters Ag Claudius Rostkuehler fuer Zementklinker u.dgl.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE942271C (de) * 1952-10-17 1956-05-03 Metallgesellschaft Ag Verfahren zum kontinuierlichen Kuehlen von extrahiertem Gut
US2863190A (en) * 1954-10-20 1958-12-09 Fischer Ag Georg Method and means for cooling granular masses containing evaporable liquid
US3161485A (en) * 1957-12-20 1964-12-15 Fischer Ag Georg Sand cooling plant
US3205543A (en) * 1963-05-27 1965-09-14 Rex Chainbelt Inc Process and apparatus for cooling foundry sand on a vibratory conveyor
US3172177A (en) * 1964-02-05 1965-03-09 Herbert C Brauchla Continuous method of preparing foundry sand
DE2540124A1 (de) * 1974-10-10 1976-04-22 Gen Kinematics Corp Wirbelschicht-kuehl- und mischvorrichtung

Also Published As

Publication number Publication date
US4377937A (en) 1983-03-29
ES505181A0 (es) 1982-08-16
EP0047914B1 (de) 1985-01-02
CA1162842A (fr) 1984-02-28
FR2489489B1 (de) 1984-04-27
DE3168042D1 (en) 1985-02-14
MA19259A1 (fr) 1982-04-01
ATE11017T1 (de) 1985-01-15
FR2489489A1 (fr) 1982-03-05
BR8105611A (pt) 1982-05-18
ES8206823A1 (es) 1982-08-16

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