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WO1998040681A1 - Secheur a cyclone pour boue - Google Patents

Secheur a cyclone pour boue Download PDF

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Publication number
WO1998040681A1
WO1998040681A1 PCT/NL1998/000142 NL9800142W WO9840681A1 WO 1998040681 A1 WO1998040681 A1 WO 1998040681A1 NL 9800142 W NL9800142 W NL 9800142W WO 9840681 A1 WO9840681 A1 WO 9840681A1
Authority
WO
WIPO (PCT)
Prior art keywords
cyclone
chamber
sludge
initial chamber
gas flow
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/NL1998/000142
Other languages
English (en)
Inventor
Wiegert Stefanus Panjer
Lambert Hooiveld
Sieward Albert Nijhuis
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.)
OPDENKAMP ADVIESGROEP BV
Original Assignee
OPDENKAMP ADVIESGROEP BV
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 OPDENKAMP ADVIESGROEP BV filed Critical OPDENKAMP ADVIESGROEP BV
Priority to AU64239/98A priority Critical patent/AU6423998A/en
Publication of WO1998040681A1 publication Critical patent/WO1998040681A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/001—Heating arrangements using waste heat
    • F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
    • F26B23/004—Heating arrangements using waste heat recovered from dryer exhaust gases by compressing and condensing vapour in exhaust gases, i.e. using an open cycle heat pump system
    • 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
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention relates to a device for drying sludge, comprising:
  • Such a device is known from DE-A-42 34 952.
  • the present invention endeavours to provide such a device which is particularly suitable for forming of sludge granulate.
  • the cyclone comprises an initial chamber and a subsequently arranged entraining chamber, wherein the gas flow debouches in the initial chamber, the initial chamber is dimensioned for drying the sludge and forming a granulate therefrom, and that the removing means are connected to the entraining chamber and this latter is dimensioned for entraining from the gas flow the granulate formed in the initial chamber .
  • the drying medium in any case - executes a circulating movement in the initial chamber, whereby the sludge is exposed to centrifugal forces .
  • the heavier sludge is pressed against the outer side of the wall and the lighter water vapour released during the drying is pressed toward the inside.
  • Water vapour is in any case lighter than sludge and lighter than the most common gases such as air, nitrogen or steam.
  • the fact that the drying medium circulates in the initial chamber ensures that the pressure on the inner side is lower than on the outer side. This effect comes about solely due to the centrifugal forces.
  • Drying of the sludge and separation of the water vapour and the dried sludge takes place separately due to these effects.
  • An example of such a geometry is obtained when the adding means debouch at the bottom of the initial chamber and the passage of the initial chamber decreases at least partially in upward direction.
  • the speed at which the drying medium flows through the passage decreases at constant flow rate, A decreasing speed results in a decreasing suspending capacity. This suspending capacity is thus dependent on the speed of the drying medium and the surface area of the particle.
  • dry sludge has a lower density
  • a division of wet and dry sludge can be made in vertical direction in the initial chamber.
  • the dry sludge in any case requires a lower suspending capacity than the wet sludge. This is manifested in a cylindrical tube because the wet sludge will mainly be found at the bottom, while the dry sludge is mainly at the top. This effect can be improved when a cone shape is applied, wherein the larger diameter is situated at the top. Insufficient suspending capacity will hereby be created for wet sludge and sufficient for dry sludge, since the through-flow surface area changes. By making a correct choice of the cone angle it is possible to obtain the correct vertical speed of the dry sludge.
  • a cylindrical part is first used at the bottom of the initial chamber. This part is mainly intended to bring about a good drying. Separation of wet and dry sludge is then important but not of decisive importance.
  • the entraining chamber is placed in the centre of the initial chamber. This results in a particularly space- saving embodiment .
  • heating means are arranged around the cyclone which are adapted for flow therethrough of a heating medium. This results in an increase in the heating capacity and thereby in a shortening of the drying time.
  • the heating means are preferably adapted to cause the heating medium to condense in the heating means. With these measures condensation heat is released, which further shortens the drying process.
  • the heating means are adapted for flow therethrough of the gas leaving the cyclone. Effective use of the available energy is hereby obtained, since the drying medium leaving the cyclone still has a certain heat content which in this way can be used effectively. It is also possible to apply the reverse situation; when a relatively warm gas is available, it can first be cooled by feeding the gas to the outer wall of the cyclone, where it relinquishes its heat, whereafter it can function as suspension medium.
  • the choice between the two options is a question of dimensioning. In respect of its large heat content, it is attractive if the device is used with steam and that the device is therefore dimensioned for this purpose. It is also attractive if the cyclone is coupled to means for sustaining a pressure in the cyclone which is lower than ambient pressure.
  • the cyclone comprises means for imparting an axial speed component to the gas flow entering the cyclone. It will be apparent that hereby, particularly when the gas flow enters a part of the cyclone of cylindrical cross-section, the movement of the sludge particles in axial direction is initiated.
  • FIG 1 shows a schematic, partly broken away view of a first embodiment of a device according to the present invention
  • figure 2 shows a schematic cross-sectional view of a second device according to the present invention
  • figure 3 shows a diagram of a first configuration in which the cyclone according to the invention is applied
  • figure 4 shows a schematic cross-sectional view of a second configuration in which the cyclone according to the invention is applied
  • figure 5 shows a schematic cross-sectional view of a third configuration in which the cyclone according to the invention is applied.
  • FIG. 1 shows a cyclone designated as a whole with 1.
  • Cyclone 1 is provided with a feed pipe 2 for supplying a mixture of sludge and air.
  • a feed pipe 2 for supplying a mixture of sludge and air.
  • an atomizing device 3 is arranged which is formed by a widening of pipe 2 into which a spray nozzle 4 debouches.
  • Spray nozzle 4 is connected to a sludge feed pipe 5 which is connected in turn to a sludge tank 6.
  • a sludge pump can be arranged in sludge feed pipe 5.
  • Cyclone 1 is formed by an upper chamber 7 and a lower chamber 8 which are separated by a ring 9.
  • a discharge conduit 10 for the dried sludge in which is arranged a valve 11.
  • This valve 11 takes an airtight form, i.e. when it is closed it does not disturb an underpressure present in the interior of cyclone 1. Valve 11 can be opened temporarily for discharge of dried sludge.
  • the cyclone is further provided with a usual gas discharge conduit 12. This debouches in the centre of the cyclone.
  • Gas discharge conduit 12 is connected to a pump 13, the blowing side of which is connected by means of a conduit 14 to a jacket 15 arranged around cyclone 1.
  • Jacket 15 debouches on its underside into a condensate discharge conduit 16.
  • FIG. 2 shows an exceptional embodiment of a cyclone 17 which is formed by an initial chamber with a cylindrical wall 18 which is followed on its upper side by a conical wall 19.
  • a feed pipe 20 for supply of the gas flow, to which the sludge is added.
  • a conical insert 21 which is connected at its top to the actual initial chamber by means of a connecting gap 22, said chamber being enclosed between conical insert 21 and cylindrical wall 18.
  • a suction pipe 24 is arranged for removal of the gas flow, while on the underside the conical insert 21 transposes into a cylindrical part 25 which is coupled to a closable discharge device 26.
  • Cylindrical part 25 extends through the bottom 27 of the cylindrical initial chamber.
  • a jacket 29 is arranged around the whole assembly, through which jacket flows a hot fluid.
  • the gas leaving outlet pipe 24 is supplied thereto after compression so that it condenses in jacket 29 and thus transfers its heat to the cyclone.
  • the relevant resulting gas is fed again to the absorbing device for absorbing the sludge .
  • FIG. 3 shows a configuration in which the dryer 1 according to the invention is used. Hot gas is initially fed herein to the jacket 15 of dryer 1, whereafter the gas functions as suspension medium for the actual drying process. For this purpose the sludge for drying is supplied thereto. The gas with the water vapour occurring during drying is discharged by means of a fan 13.
  • Figure 4 shows an embodiment wherein the mixture of gas and steam coming from the fan is separated, the steam is discharged and the gas is fed to a heating device 30. The gas then relinquishes its heat to the jacket and functions again as suspension gas.
  • figure 5 shows an embodiment wherein the suspension gas is heated in a heat exchanger 40, sludge is fed thereto and the thus created mixture is supplied to dryer 1. After passing through a dust filter 41 the gas coming from dryer 1 is compressed in a two- stage compressor 42,43 and fed to jacket 15.
  • a steam boiler 45 is arranged to supply heat exchanger 40.
  • a quencher 46 For preheating of the sludge use can be made of a heat exchanger 47 which is connected in series to heat exchanger 44 which is supplied by a branch of two-stage compressor 43,42.
  • the gas released from the jacket can be supplied via for instance a condenser to the atomizing device. Emissions of undesired substances are hereby prevented and the possibility results of creating an inert environment, whereby drying of corrosive, explosive or unstable compounds becomes possible. It is even possible to make use of water vapour or steam as gas . It is also possible to make use of nitrogen as suspension gas, particularly as initial suspension gas, when use is further made of for instance steam.
  • sludge such as sewage sludge, drinking-water sewage sludge, dredge spoil, slaughter waste, mercury-containing oil sludge.
  • the invention is also applicable to the drying of manure, concentration by evaporation of contaminated water or production of drinking-water.
  • Modifications of the construction can also be envisaged, such as the use of a cyclone with more than two chambers, the use of more than one inlet point for the drying air and the use of a fluidizing bed plate under the cyclone.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Sludge (AREA)

Abstract

L'invention concerne un dispositif permettant de sécher de la boue, qui comprend un cyclone, un système pour générer un flux gazeux aboutissant au cyclone, un système d'ajout pour ajouter la boue à sécher au flux gazeux, et un système d'évacuation pour sortir la boue séchée du cyclone. Ce dernier comprend une première chambre suivie d'une chambre d'entraînement. Le flux gazeux débouche dans la première chambre, dont les dimensions lui permettent de sécher la boue de façon à former des granulés. Le système d'évacuation est relié à la chambre d'entraînement, dont les dimensions lui permettent d'extraire du flux gazeux les granulés formés dans la première chambre. Ce dispositif facilite la formation des granulés. De préférence, un système de chauffage, disposé autour du cyclone, est conçu pour permettre le passage d'un fluide chauffant.
PCT/NL1998/000142 1997-03-10 1998-03-10 Secheur a cyclone pour boue Ceased WO1998040681A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU64239/98A AU6423998A (en) 1997-03-10 1998-03-10 Cyclone dryer for sludge

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1005482 1997-03-10
NL1005482A NL1005482C2 (nl) 1997-03-10 1997-03-10 Cycloondroger voor slib.

Publications (1)

Publication Number Publication Date
WO1998040681A1 true WO1998040681A1 (fr) 1998-09-17

Family

ID=19764564

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1998/000142 Ceased WO1998040681A1 (fr) 1997-03-10 1998-03-10 Secheur a cyclone pour boue

Country Status (3)

Country Link
AU (1) AU6423998A (fr)
NL (1) NL1005482C2 (fr)
WO (1) WO1998040681A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007031718A3 (fr) * 2005-09-12 2008-07-03 Spirax Sarco Ltd Purgeur de condensat
WO2012017092A1 (fr) * 2010-08-06 2012-02-09 Commissariat A L'energie Atomique Et Aux Energies Alternatives Procede et installation de sechage de boues
FR2969598A1 (fr) * 2010-12-27 2012-06-29 Degremont Procede et installation de sechage de produits pateux, en particulier de boues de station d'epuration
CN102909138A (zh) * 2012-10-18 2013-02-06 苏忠 一种可防止烟气管道阻塞的旋风除尘器

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE588688C (de) * 1933-11-23 I G Farbenindustrie Akt Ges Verfahren zum Trocknen feuchter Stoffe
US2316207A (en) * 1941-04-08 1943-04-13 Atlantic Res Associates Inc Method and apparatus for rapidly drying casein curd and like substances
US2911730A (en) * 1955-03-19 1959-11-10 Ruhrchemie Ag Drying of divided solid materials
US2924887A (en) * 1956-01-17 1960-02-16 Proctor & Schwartz Inc Dryer for granular, fibrous and like material
GB981750A (en) * 1962-02-03 1965-01-27 Bayer Ag Apparatus for drying particles carried in a stream of gas
GB1041120A (en) * 1964-01-02 1966-09-01 Fluid Energy Proc And Equipmen Improvements in method and means for grinding, drying, coating, mixing and chemically treating solids
DE1299597B (de) * 1965-11-06 1969-07-24 Kloeckner Humboldt Deutz Ag Vorrichtung zur Behandlung von feinkoernigem Gut durch Gase
FR2276870A1 (fr) * 1974-07-06 1976-01-30 Hoechst Ag Procede et dispositif de traitement thermique d'un melange de substances solides finement divisees et de gaz
WO1988004020A1 (fr) * 1986-11-21 1988-06-02 Moszkowski Stefan J Dispositif de sechage pour materiau granulaire
CH681417A5 (en) * 1990-02-23 1993-03-31 Jean Claude Aigeldinger Procedure and appts. for hardening and esp. drying, paste-like prods. - where prod. is extruded into vacuum chamber, carried forward over a certain distance by rapid gas stream, velocity is then reduced and prod. sepd. from gas
EP0548688A1 (fr) * 1991-12-24 1993-06-30 Hoechst Aktiengesellschaft Procédé et dispositif pour le traitement thermique d'un mélange de matières solides et de gaz
US5291668A (en) * 1992-04-03 1994-03-08 Tecogen, Inc. Steam atmosphere drying exhaust steam recompression system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2696677A (en) * 1952-01-14 1954-12-14 Lester V Molenaar Dehydrator
DE1138025B (de) * 1957-12-21 1962-10-18 Bayer Ag Verfahren zum Trocknen von Kieselsaeure- und Silicatfuellstoffen
NL9100606A (nl) 1991-04-08 1992-11-02 Vandenbroek Int Bv Drooginrichting.
DE4234952A1 (de) * 1992-10-16 1994-04-21 Kloeckner Humboldt Deutz Ag Verfahren und Vorrichtung zur thermischen Trocknung von Schlämmen

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE588688C (de) * 1933-11-23 I G Farbenindustrie Akt Ges Verfahren zum Trocknen feuchter Stoffe
US2316207A (en) * 1941-04-08 1943-04-13 Atlantic Res Associates Inc Method and apparatus for rapidly drying casein curd and like substances
US2911730A (en) * 1955-03-19 1959-11-10 Ruhrchemie Ag Drying of divided solid materials
US2924887A (en) * 1956-01-17 1960-02-16 Proctor & Schwartz Inc Dryer for granular, fibrous and like material
GB981750A (en) * 1962-02-03 1965-01-27 Bayer Ag Apparatus for drying particles carried in a stream of gas
GB1041120A (en) * 1964-01-02 1966-09-01 Fluid Energy Proc And Equipmen Improvements in method and means for grinding, drying, coating, mixing and chemically treating solids
DE1299597B (de) * 1965-11-06 1969-07-24 Kloeckner Humboldt Deutz Ag Vorrichtung zur Behandlung von feinkoernigem Gut durch Gase
FR2276870A1 (fr) * 1974-07-06 1976-01-30 Hoechst Ag Procede et dispositif de traitement thermique d'un melange de substances solides finement divisees et de gaz
WO1988004020A1 (fr) * 1986-11-21 1988-06-02 Moszkowski Stefan J Dispositif de sechage pour materiau granulaire
CH681417A5 (en) * 1990-02-23 1993-03-31 Jean Claude Aigeldinger Procedure and appts. for hardening and esp. drying, paste-like prods. - where prod. is extruded into vacuum chamber, carried forward over a certain distance by rapid gas stream, velocity is then reduced and prod. sepd. from gas
EP0548688A1 (fr) * 1991-12-24 1993-06-30 Hoechst Aktiengesellschaft Procédé et dispositif pour le traitement thermique d'un mélange de matières solides et de gaz
US5291668A (en) * 1992-04-03 1994-03-08 Tecogen, Inc. Steam atmosphere drying exhaust steam recompression system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007031718A3 (fr) * 2005-09-12 2008-07-03 Spirax Sarco Ltd Purgeur de condensat
WO2012017092A1 (fr) * 2010-08-06 2012-02-09 Commissariat A L'energie Atomique Et Aux Energies Alternatives Procede et installation de sechage de boues
FR2963616A1 (fr) * 2010-08-06 2012-02-10 Commissariat Energie Atomique Procede et installation de sechage de boues
CN103069239A (zh) * 2010-08-06 2013-04-24 原子能和替代能源委员会 用于污泥干燥的方法和设施
CN103069239B (zh) * 2010-08-06 2015-07-22 原子能和替代能源委员会 用于污泥干燥的方法和设施
US9869514B2 (en) 2010-08-06 2018-01-16 Commissariat A L'energie Atomique Et Aux Energies Alternatives Sludge drying method and installation
FR2969598A1 (fr) * 2010-12-27 2012-06-29 Degremont Procede et installation de sechage de produits pateux, en particulier de boues de station d'epuration
WO2012090135A1 (fr) * 2010-12-27 2012-07-05 Degremont Procede et installation de sechage de produits pateux, en particulier de boues de station d'epuration
CN102909138A (zh) * 2012-10-18 2013-02-06 苏忠 一种可防止烟气管道阻塞的旋风除尘器

Also Published As

Publication number Publication date
NL1005482C2 (nl) 1998-09-17
AU6423998A (en) 1998-09-29

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