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WO1998004879A1 - Dispositif servant a effectuer un echange de chaleur entre un gaz et un materiau en particules fines - Google Patents

Dispositif servant a effectuer un echange de chaleur entre un gaz et un materiau en particules fines Download PDF

Info

Publication number
WO1998004879A1
WO1998004879A1 PCT/EP1997/003512 EP9703512W WO9804879A1 WO 1998004879 A1 WO1998004879 A1 WO 1998004879A1 EP 9703512 W EP9703512 W EP 9703512W WO 9804879 A1 WO9804879 A1 WO 9804879A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
gas
shaft section
sections
heat exchange
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.)
Ceased
Application number
PCT/EP1997/003512
Other languages
English (en)
Inventor
Mogens Juhl Fons
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.)
FLSmidth and Co AS
Original Assignee
FLSmidth and Co AS
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 FLSmidth and Co AS filed Critical FLSmidth and Co AS
Priority to AU34429/97A priority Critical patent/AU3442997A/en
Publication of WO1998004879A1 publication Critical patent/WO1998004879A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/432—Preheating without addition of fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
    • F26B17/107—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers pneumatically inducing within the drying enclosure a curved flow path, e.g. circular, spiral, helical; Cyclone or Vortex dryers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/14—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas
    • F26B17/1433—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas the drying enclosure, e.g. shaft, having internal members or bodies for guiding, mixing or agitating the material, e.g. imposing a zig-zag movement onto the material
    • F26B17/1441—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas the drying enclosure, e.g. shaft, having internal members or bodies for guiding, mixing or agitating the material, e.g. imposing a zig-zag movement onto the material the members or bodies being stationary, e.g. fixed panels, baffles, grids, the position of which may be adjustable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/24—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by shooting or throwing the materials, e.g. after which the materials are subject to impact
    • 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 present invention relates to a device for achieving exchange of heat between a gas and a fine-grained material, such as cement raw meal, the device comprising a substantially vertical, rotationally symmetrical shaft which is provided with at least one gas inlet at its lower end, a central gas outlet at its upper end, and a material inlet likewise at its upper end, and a central material outlet at its lower end, through which shaft the gas stream passes through from the lower end and upwards along a helical path, whereas the material which is fed at the top and discharged at the bottom during its passage through the shaft is repeatedly thrust outwards against the wall of the shaft and re-introduced into the gas stream.
  • the invention relates particularly to a heat exchange device in which an exchange of heat is achievable between hot gas and cold fine-grained material according to the counterflow principle and in such a way that the hot gas when passing up through the device is cooled down from a high inlet temperature, which typically ranges between 1000 and 1200°C, to a low discharge temperature within the range 100 - 200°C above the ambient temperature, while, simultaneously, during its passage down through the device the material is heated from a low inlet temperature, typically corresponding to the ambient temperature, to a high discharge temperature within the range 0 - 200°C below the inlet temperature of the gas.
  • a high inlet temperature typically ranges between 1000 and 1200°C
  • DE-B-1178001 discloses a heat exchange device comprising a cylindrical shaft which is made up of several sections positioned on top of one another, and in which the material is introduced at the top and discharged at the bottom, whereas the gas is introduced axially at the bottom and discharged axially at the top.
  • the said patent specification suggests that a sub-stream of the discharge gas is separated from the principal gas stream and subsequently injected at high velocity tangentially into the shaft. Optimum efficiency cannot be achieved with such a device since it uses the relatively low-temperature discharge gas as injection gas, thereby lowering the temperature in the lower part of the shaft.
  • DE-B-1813519 describes another heat exchange device which comprises a cylindrical shaft of identical diameter over its entire length.
  • the gas is introduced tangentially at the bottom of the shaft and, as a consequence hereof, follows a helical path up through the shaft.
  • the shaft comprises a number of outwardly buckling features which function as guiding faces for re-introducing the material into the gas stream.
  • the gas stream must be capable of imparting to the material a relatively high tangential velocity, so that the material leaves the outwardly buckling features at a high radial velocity and does not just fall down along the shaft wall.
  • the temperature of the gas will decrease substantially up through the shaft.
  • the velocity of the gas will also decrease which means that the tangential velocity component in the upper part of the shaft will not be sufficient to impart to the material the intended radial velocity at the outwardly buckled features. Therefore, the heat exchange between the gas and the material will be restricted in the upper part of the shaft.
  • a further disadvantage of both of the known devices is the fact that their separation efficiency appears to be insufficient, and, therefore, it will be necessary to install a separation cyclone immediately above the device.
  • a device of the kind mentioned in the introduction characterized in that the shaft is built up of several substantially cylindrical shaft sections positioned on top of one another, with the diameter of the sections decreasing from the bottom upwards, and in that the gas inlet (s) is (are) provided tangentially in the lowermost shaft section.
  • a compact heat exchange device which will ensure efficient heat exchange between the gas and the material as well as a material separation efficiency which is high enough to eliminate the need for a subsequent separation cyclone.
  • This is due to the fact that the tangentially fed gas maintains, all the way up through the shaft, a sufficiently high tangential velocity for the material in each shaft section to be thrust out towards the shaft wall and thereby separated from the gas, and the fact that on its passage down through the shaft the material is repeatedly directed back into the gas stream.
  • the shaft is made up of a number of shaft sections positioned on top of one another, with the diameter, and hence the cross-sectional area, of the shaft sections decreasing from the bottom upwards, means that the shaft volume available for gas stream passage will drop proportionately to the volume of the gas. Hence the circumferential velocity of the gas can be maintained all the way up through the shaft through appropriate selection of the shaft dimensions relatively to the temperature drop of the gas.
  • the filler body may advantageously take the form of a cone or a truncated cone which is placed coaxial- ly with the shaft.
  • the filler body may be equipped on its outer side with guiding means, particularly in the form of plates, which are fitted horizontally or at a moderately inclining angle viewed in relation to the tangential velocity component of the gas so that the gas will follow a helical path at a very small rate of inclination and with the maximum achievable circumferential velocity.
  • the guiding means may advantageously consist of a helicoid guide plate with an angle of inclination of approximately 5°.
  • each shaft section may be configured as an inverted truncated cone so as to ensure that the material which drops from one shaft section to the next one is retained in the gas stream during an extended period of time, thereby increasing the temperature of the material.
  • a slight protrusion of the lower part of each shaft section into the underlying shaft section may also be advantageous.
  • the relationship between the diameter and height of each shaft section is between 2 and 10, preferably between 3 and 6.
  • the relationship between the diameters of two adjacent shaft sections is between 8:7 and 3:2, preferably between 6 : 5 and 4:3.
  • the figure depicts a heat exchange device 1 which comprises a vertical, rotationally symmetrical shaft 11 which is formed with a tangential gas inlet 3 at its lower end, a central gas outlet 5 at its upper end, a material inlet 7 also at its upper end, and a central material outlet 9 at its lower end.
  • the shaft 11 is divided into a number of cylindrical shaft sections 11a, lib, lie, lid, lie, the diameters D of which decrease from the bottom and upwards.
  • the tangential gas inlet 3 is configured in the lowermost shaft section 11a.
  • the illustrated heat exchange device further comprises a filler body in the form of a cone 13 which is fixed coaxially within the shaft 11 in unspecified manner.
  • a filler body in the form of a cone 13 which is fixed coaxially within the shaft 11 in unspecified manner.
  • the cone 13 On its outer side the cone 13 is provided with a helicoid guide plate 15 with an angle of inclination of 5°.
  • the primary function of the guide plate 15 is to force the gas stream into following a helical path up through the shaft 11 at the smallest possible angle of inclination so that the gas achieves the maximum attainable circumferential velocity.
  • the guide plate 15 has a width which is preferably such that it protrudes between one-fifth and one-third of the way into the shaft space between the shaft wall and the cone.
  • each shaft section may be configured as an inverted truncated cone 17 which protrudes slightly into the underlying shaft section.
  • a uniform flow of material is directed into the uppermost shaft section lie via the opening 7.
  • the material is entrained in the gas stream which is circulating at a high velocity and after being retained in the gas stream for a certain period of time during which the material is heated to a temperature close to that of the gas, the material is thrust out towards guide face formed by the wall of the shaft section, wherefrom it drops down into the underlying shaft section lid in which the process is repeated.
  • the material is gradually heated as it is flows down through the shaft while, at the same time, the gas is cooled accordingly as it flows up through the shaft.
  • the heated material is discharged from the shaft via the outlet 9 whereas the cooled gas stream is discharged via the outlet 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Cyclones (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

Dispositif (1) servant à effectuer un échange de chaleur entre un gaz et un matériau en particules fines, tel qu'un ciment brut en poudre, et comprenant un arbre vertical (11) de rotation symétrique, pourvu d'entrées de gaz (3) au niveau de son extrémité inférieure, d'une sortie centrale (5) de gaz au niveau de son extrémité supérieure d'une entrée de matériau (7) située de la même manière au niveau de son extrémité supérieure, ainsi qu'une d'une sortie centrale (9) de matériau au niveau de son extrémité inférieure. Le gaz passe à travers l'arbre depuis l'extrémité inférieure et monte en suivant un trajet hélicoïdal, tandis que le matériau introduit au sommet et évacué au fond pendant son passage à travers l'arbre, est poussé de façon répétée vers l'extérieur contre la paroi de l'arbre et introduit de nouveau dans le courant de gaz. Cet arbre est constitué par plusieurs sections cylindriques (11a, 11b, 11c, 11d, 11e), placées les unes au-dessus des autres, les diamètres de ces sections diminuant depuis l'extrémité supérieure vers le haut et les entrées de gaz (3) présentant une configuration tangentielle dans la section d'arbre la plus inférieure (11a).
PCT/EP1997/003512 1996-07-30 1997-07-03 Dispositif servant a effectuer un echange de chaleur entre un gaz et un materiau en particules fines Ceased WO1998004879A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU34429/97A AU3442997A (en) 1996-07-30 1997-07-03 Apparatus for effecting heat exchange between a gas and a fine particulate material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK82096A DK172537B1 (da) 1996-07-30 1996-07-30 Indretning til varmeveksling
DK0820/96 1996-07-30

Publications (1)

Publication Number Publication Date
WO1998004879A1 true WO1998004879A1 (fr) 1998-02-05

Family

ID=8097931

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/003512 Ceased WO1998004879A1 (fr) 1996-07-30 1997-07-03 Dispositif servant a effectuer un echange de chaleur entre un gaz et un materiau en particules fines

Country Status (4)

Country Link
AU (1) AU3442997A (fr)
DK (1) DK172537B1 (fr)
ID (1) ID17957A (fr)
WO (1) WO1998004879A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004007083A3 (fr) * 2002-07-16 2004-04-29 United States Filter Corp Systeme et procede de traitement de courants a phase mixte
CN110160326A (zh) * 2019-05-08 2019-08-23 浙江宝绿特环保技术工程有限公司 瓶片脱水机及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001525029A (ja) * 1997-02-01 2001-12-04 フォード、グローバル、テクノロジーズ、インコーポレーテッド 直接噴射火花点火エンジン

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE63930C1 (fr) *
GB2132742A (en) * 1982-12-23 1984-07-11 Ube Industries Precalciner for cement raw meal
DE3122476C2 (de) * 1981-06-05 1986-09-25 Ivan Matveevič Dianov Staubabscheidevorrichtung
DE3639046A1 (de) * 1986-11-14 1988-05-26 Krupp Gmbh Verfahren und vorrichtung zum waerme- und stoffaustausch zwischen einem stroemenden medium und feinkoernigen feststoffen
EP0341196A2 (fr) * 1988-05-02 1989-11-08 Herwig Michel-Kim Réacteurs à lit déplaçable pourvu d'une surface de passage étendue
US5131462A (en) * 1988-03-08 1992-07-21 F. L. Smidth & Co. A/S Heat exchanger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE63930C1 (fr) *
DE3122476C2 (de) * 1981-06-05 1986-09-25 Ivan Matveevič Dianov Staubabscheidevorrichtung
GB2132742A (en) * 1982-12-23 1984-07-11 Ube Industries Precalciner for cement raw meal
DE3639046A1 (de) * 1986-11-14 1988-05-26 Krupp Gmbh Verfahren und vorrichtung zum waerme- und stoffaustausch zwischen einem stroemenden medium und feinkoernigen feststoffen
US5131462A (en) * 1988-03-08 1992-07-21 F. L. Smidth & Co. A/S Heat exchanger
EP0341196A2 (fr) * 1988-05-02 1989-11-08 Herwig Michel-Kim Réacteurs à lit déplaçable pourvu d'une surface de passage étendue

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004007083A3 (fr) * 2002-07-16 2004-04-29 United States Filter Corp Systeme et procede de traitement de courants a phase mixte
US7572627B2 (en) 2002-07-16 2009-08-11 United States Filter Corporation System of processing mixed-phase streams
CN110160326A (zh) * 2019-05-08 2019-08-23 浙江宝绿特环保技术工程有限公司 瓶片脱水机及方法

Also Published As

Publication number Publication date
ID17957A (id) 1998-02-12
DK82096A (da) 1998-01-31
AU3442997A (en) 1998-02-20
DK172537B1 (da) 1998-11-30

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