EP0024755A2 - Procédé et dispositif de chauffage de matériaux contenant de l'asphalte - Google Patents

Procédé et dispositif de chauffage de matériaux contenant de l'asphalte Download PDF

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Publication number
EP0024755A2
EP0024755A2 EP80200727A EP80200727A EP0024755A2 EP 0024755 A2 EP0024755 A2 EP 0024755A2 EP 80200727 A EP80200727 A EP 80200727A EP 80200727 A EP80200727 A EP 80200727A EP 0024755 A2 EP0024755 A2 EP 0024755A2
Authority
EP
European Patent Office
Prior art keywords
drum
combustion gases
combustion chamber
asphalt
containing materials
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Withdrawn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
EP80200727A
Other languages
German (de)
English (en)
Other versions
EP0024755A3 (fr
Inventor
Harm Dinand Eshuis
Cornelis Mourik
Cornelis Martinus Alouisius Van Veldhoven
Jan Sjouke Ir. Sipkema
Egbert Geluk
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.)
Renofalt VoF
Original Assignee
Renofalt VoF
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 Renofalt VoF filed Critical Renofalt VoF
Publication of EP0024755A2 publication Critical patent/EP0024755A2/fr
Publication of EP0024755A3 publication Critical patent/EP0024755A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027—Mixing in a rotary receptacle
    • E01C19/1036—Mixing in a rotary receptacle for in-plant recycling or for reprocessing, e.g. adapted to receive and reprocess an addition of salvaged material, adapted to reheat and remix cooled-down batches
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C2019/1081—Details not otherwise provided for
    • E01C2019/1095—Mixing containers having a parallel flow drum, i.e. the flow of material is parallel to the gas flow

Definitions

  • the invention relates to a method of heating asphalt-containing materials in a device with the aid of combustion gases or heated air respectively.
  • a disadvantage thereof is that the tubes must have a comparatively high temperature, which results in sticking material on the tubes so that the passage of the materials to be heated between the tubes is soon blocked. Cleaning the interior of the drum with the tubes arranged therein, which is then unavoidable, is particularly onerous and costly, whilst in addition the device has to be put out of operation.
  • the invention has for its object to provide a method of the kind set forth in which such asphalt-containing materials can be more effectively heated.
  • the gases used for the indirect heating may have a higher temperature so that optimum heating is obtainable.
  • an effective device for heating asphalt-containing materials can be obtained by providing it with a rotatable drum comprising channels,extending in the direction of the lenght of the drum, through which the flue gases are passed from one end of the drum towards the other end thereof, there being provided means for guiding the flue gases emanating from the channels towards the interior of the drum.
  • a rotatable drum comprising channels,extending in the direction of the lenght of the drum, through which the flue gases are passed from one end of the drum towards the other end thereof, there being provided means for guiding the flue gases emanating from the channels towards the interior of the drum.
  • the device shown schematically in fig. 1 comprises-a drum adapted to rotate about its longitudinal axis, which is at a small angle to the horizon. With the topmost left-hand end of the drum 1, viewed in fig. 1, communicates a burner chamber 2, in which a burner 3 is arranged. Inside the drum 1 is arranged a drum 4 concentrically with the drum 1 and connected in a manner not shown in detail with the drum 1 so that the two drums 1 and 4 together are rotatable about the centre line of the drum 1.
  • the left-hand end of the drum 4 is closed by a head wall 5 having holes for connecting a plurality of tubes 6 extending in the direction of lenght of the drum.
  • a feeding member for feeding asphalt-containing materials into the interior of the drum 4 in the direction of the arrow A
  • a delivery mem E is arranged for the delivery of the heated material in the direction of the arrow B. Since during operation the drums 1 and 4 are rotating, the material carried along also by the tubes 6 in the drums will move across the drum more or less along a helical path as is indicated by the line of connection between the arrows A and B.
  • the heated air of the oombustion chamber or the combustion gases produced therein will flow out of the combustion chamber 2 partly through the the space between the drums 1 and 4 and partly through the tubes 6 as is indicated by the arrows C and D.
  • these combustion gases flow freely into the interior of the drum 1 and will subsequently flow back in direct contact with the asphalt-containing material in the drum in the direction of the arrow E towards an outlet (not shown in detail), from which the combustion gases are conducted away in the direction of the arrow F. If desir desired, at least part of this heated air or combustion gases can be recycled to the combustion chamber 2.
  • the asphalt-containing material obtained, for example, by breaking up a road cover is preheated at about 85°C by direct injection of steam into this material, after which the moisture content of the material is reduced to about 4% by forced or natural leakage.
  • the material thus preheated at 85 0 C is fed as described above in the direction of the arrow A into the device and will gradually flow through the drum and be conducted away in the direction of the arrow B.
  • the hot gases flowing out of the combustion chamber which gases may have a temperature of about 600°C, will initially give off heat indirectly across the wall of the drum 4 and the walls of the tubes 6 to the asphalt-containing material and by this indirect heat transfer overheating of the combustion gases of high temperature is avoided.
  • the temperature of the combustion gases will have dropped below 450°C, preferably below about 400 C, so that the combustion gases then coming into direct contact with the material will not cause undesirable conversions in the material but will bring about an effective, uniform heating of this material.
  • Preheating of the material at about 85°C prevents to a great extent sticking material in the interior of the device. Moreover, the moisture still contained in the material will counteract adhesion of material in the interior of the device. Moreover, the mode of heating described is found to counteract sticking of material so that by applying the method according to the invention, the device can be maintained in operation undisturbed for a long time, whilst a particularly effective and uniform heating of the material is produced.
  • the system shown in fig. 2 comprises a rotatable drum 8, the interior of which comprises more or less triangular channels 9 (fig. 3), to which inwardly projecting blades 10 are fastened.
  • This drum 8 is also rotatable about its longitudinal axis and arranged at a small angle to the horizontal.
  • a burner chamber 11 disposed near the drum communicates through a conduit 12 with an annular conduit 13 surrounding the right-hand end of the drum, viewed in fig. 2, with which the channels 9 are in open communication.
  • the left-hand ends of the channels 9 open out in an annular conduit 14 also surrounding the drum 8, which is connected through a bypass conduit 5 with a burner chamber 16 disposed near the right-hand top end of the drum 8.
  • the material can be fed in the conventional manner at the right-hand top end of the drum 8, as is illustrated schematically by the conveyor belt 17.
  • the end of the drum 8 projecting beyond the annular conduit 14 communicates with an outlet conduit 18 for the flue gases, in which conduit, if desired, a heat exchanger 19 may be arranged, for example, for heating boiler water or the like.
  • the conduit 18 includes furthermore a blower 20 for sucking away the exhaust gases.
  • the exhaust gases are passed through a washing device 21 for removing dust, after which the combustion gases can flow away through a chimney 22.
  • part of the used combustion gases may be fed back to the burner chamber, as is indicated by broken lines, so that these hotter gases can again be utilized in the process, which will have an energy saving ' effe ct.
  • the comparatively hot combustion gases flowing out of the burner chamber 11 will first be passed through the channels 9 and thus indirectly heat the asphalt-containing materials in the drum. Subsequently, these combustion gases are fed to the burner chamber 16, where the temperature of the combustion gases can be raised, if necessary, to a value such that these combustion gases subsequently introduced into the drum 8 and thus being in direct contact with the material will not adversely affect the properties of the material to be heated.
  • conventional control-devices 24 may be provided.
  • the combustion gases flowing out of the burner chamber 16 through the drum 8 have the same direction of flow as the combustion gases through the channels 9.
  • the gases passing through the interior of the drum will, in addition, be indirectly heated by the gases passing through the channels,-which contributes to an effective, uniform heating of the material, which is effectively kept moving by the blades 10, to which the material is not likely to stick.
  • the system shown in fig. 4 corresponds at least partly with the system shown in figs. 2 and 3 and parts corresponding with those shown in figs. 2 and 3 are designated by the same reference numerals.
  • the annular conduit 14 is connected with a conduit 25 communicating with with a blower 26.
  • the outlet of the blower 26 is branched into two conduits 27 and 28.
  • the conduit 27 opens out in the burner chamber 11 and the conduit 27 includes a control-valve 29 actuated by a control-device 24 in a manner similar to the preceding embodiment.
  • the conduit 28 including a valve 30 for controlling the subatmospheric pressure opens out in a mixing chamber 31 arranged in front of the drum 8.
  • a burner chamber 32 communicates with said mixing chamber.
  • the outlet conduit 18 communicates with a conduit 33, which connects the outlet conduit 18 with a blower 34. With the blower 34 communicates a conduit 35 opening out in the burner chamber 32.
  • the end of the conduit 35 has a control-valve 36, which is adjustable in dependence upon the temperature. If desired, as is shown in fig. 4, the conduit 35 may include a device 37 for washing the gases flowing through the conduit 35 in order to remove dust from the combustion gases.
  • the outlet conduit 18 furthermore communicates a moisture cyclone 38 through an intermediate conduit 39.
  • the intermediate conduit 39 comprises a control-valve 40 for controlling the subatmospheric pressure.
  • a blower 43 communicates with the cyclone 38 for sucking away the combustion gases and conducting them into the chimney 22.
  • the gases emanating from the burner chamber 11 are used for indirect heating in a manner similar-to-that described with reference to the preceding embodiment.
  • the combustion gases are partly fed back to the burner chamber 11 and partly to a mixing chamber 31, where these combustion gases from the burner chamber 11, which have already given off part of their heat, are mixed with combustion gases emanating from the burner chamber 32.
  • the mixture of combustion gases thus formed in the mixing chamber 31 is passed through the drum 8 in direct contact with the asphalt-containing materials, which are thus directly heated.
  • the gases flowing out of the drum are partly sucked off by the blower 34 and fed back to the burner chamber 32.
  • the remaining portion of the combustion gases is passed through the cyclone 38, where dust is removed from the combustion gases, the clean combustion gases being subsequently conducted away through the chimney 22.
  • the heated materials are delivered at the port 43 at the lower end of the outlet conduit 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Road Paving Machines (AREA)
EP80200727A 1979-08-27 1980-07-30 Procédé et dispositif de chauffage de matériaux contenant de l'asphalte Withdrawn EP0024755A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7906433A NL7906433A (nl) 1979-08-27 1979-08-27 Werkwijze en inrichting voor het verwarmen van asfalt- houdende materialen
NL7906433 1979-08-27

Publications (2)

Publication Number Publication Date
EP0024755A2 true EP0024755A2 (fr) 1981-03-11
EP0024755A3 EP0024755A3 (fr) 1981-09-23

Family

ID=19833737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80200727A Withdrawn EP0024755A3 (fr) 1979-08-27 1980-07-30 Procédé et dispositif de chauffage de matériaux contenant de l'asphalte

Country Status (2)

Country Link
EP (1) EP0024755A3 (fr)
NL (1) NL7906433A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992011983A1 (fr) * 1990-12-27 1992-07-23 Astec Industries, Inc. SECHEUR D'AGREGAT REJETANT MOINS DE NOx, DESTINE A ETRE UTILISE DANS UNE USINE PRODUISANT DE L'ASPHALTE
WO1993010952A1 (fr) * 1991-11-27 1993-06-10 Cyclean, Inc. Procede et appareil servant a produire de l'asphalte melange a chaud
US5303999A (en) * 1989-07-31 1994-04-19 Cyclean, Inc. Apparatus for control of recycled asphalt production
US5322367A (en) * 1989-07-31 1994-06-21 Cyclean, Inc. Process control for recycled asphalt pavement drum plant
US5344229A (en) * 1989-07-31 1994-09-06 Cyclean, Inc. Angle and velocity adjustment of a hot mix asphalt drum when output gas temperatures are uneven
US6267493B1 (en) * 1999-06-02 2001-07-31 Cmi Corporation Drum mixer having a plurality of isolated aggregate transport channels

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7906433A (nl) * 1979-08-27 1981-03-03 Harm Dinand Eshuis Cornelis Mo Werkwijze en inrichting voor het verwarmen van asfalt- houdende materialen

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191507141A (en) * 1915-05-12 1916-06-12 Highways Construction Ltd Improvements in Apparatus for Heating, Drying, and Mixing Stone, Sand, and/or other Materials for use on Roads and like Surfaces.
DE456740C (de) * 1928-02-29 Friedrich Haas Ges Neuwerk Mas Trockentrommel mit Aussen- und Innenbeheizung
DE488751C (de) * 1930-01-07 Fritz Haas Verfahren zur Beheizung von Trockentrommeln
US1823189A (en) * 1929-10-09 1931-09-15 Carpenter William Clarence Drier
DE701070C (de) * 1936-04-07 1941-01-08 Gottlob Grauert Mittelbar beheizte Trockentrommel
US2413908A (en) * 1942-08-04 1947-01-07 Pavements Reclaiming Corp Apparatus for conditioning pavement material
US3866888A (en) * 1973-01-26 1975-02-18 Baldwin Thomas I Apparatus for making hot asphalt paving material
DE2446579A1 (de) * 1974-09-30 1976-04-01 Walter Schoelkopf Verfahren und vorrichtung zur wiederverwendung bituminoeser massen
US3971666A (en) * 1972-09-05 1976-07-27 Mendenhall Robert Lamar Process for recycle of asphalt-aggregate compositions
NL7708800A (en) * 1977-08-10 1979-02-13 Moel Wegenbouwmaatschappij B V Used asphalted concrete reworking system - heats in vessel and mixes with new asphalt
US4142803A (en) * 1976-10-05 1979-03-06 Mendenhall Robert Lamar Recycled asphalt-aggregate process and apparatus
US4190370A (en) * 1978-11-24 1980-02-26 Astec Industries, Inc. Asphalt plant with improved temperature control system
NL7905309A (nl) * 1979-07-06 1981-01-08 Bomat Materieel B V Inrichting voor het vervaardigen van een warm asfalt- mengsel uit oud asfaltwegdekmateriaal.
NL7906433A (nl) * 1979-08-27 1981-03-03 Harm Dinand Eshuis Cornelis Mo Werkwijze en inrichting voor het verwarmen van asfalt- houdende materialen

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE456740C (de) * 1928-02-29 Friedrich Haas Ges Neuwerk Mas Trockentrommel mit Aussen- und Innenbeheizung
DE488751C (de) * 1930-01-07 Fritz Haas Verfahren zur Beheizung von Trockentrommeln
GB191507141A (en) * 1915-05-12 1916-06-12 Highways Construction Ltd Improvements in Apparatus for Heating, Drying, and Mixing Stone, Sand, and/or other Materials for use on Roads and like Surfaces.
US1823189A (en) * 1929-10-09 1931-09-15 Carpenter William Clarence Drier
DE701070C (de) * 1936-04-07 1941-01-08 Gottlob Grauert Mittelbar beheizte Trockentrommel
US2413908A (en) * 1942-08-04 1947-01-07 Pavements Reclaiming Corp Apparatus for conditioning pavement material
US3971666A (en) * 1972-09-05 1976-07-27 Mendenhall Robert Lamar Process for recycle of asphalt-aggregate compositions
US3866888A (en) * 1973-01-26 1975-02-18 Baldwin Thomas I Apparatus for making hot asphalt paving material
DE2446579A1 (de) * 1974-09-30 1976-04-01 Walter Schoelkopf Verfahren und vorrichtung zur wiederverwendung bituminoeser massen
US4142803A (en) * 1976-10-05 1979-03-06 Mendenhall Robert Lamar Recycled asphalt-aggregate process and apparatus
NL7708800A (en) * 1977-08-10 1979-02-13 Moel Wegenbouwmaatschappij B V Used asphalted concrete reworking system - heats in vessel and mixes with new asphalt
US4190370A (en) * 1978-11-24 1980-02-26 Astec Industries, Inc. Asphalt plant with improved temperature control system
NL7905309A (nl) * 1979-07-06 1981-01-08 Bomat Materieel B V Inrichting voor het vervaardigen van een warm asfalt- mengsel uit oud asfaltwegdekmateriaal.
NL7906433A (nl) * 1979-08-27 1981-03-03 Harm Dinand Eshuis Cornelis Mo Werkwijze en inrichting voor het verwarmen van asfalt- houdende materialen

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DE PERIODICAL "BITUMEN", Vol. 41, No. 2, March/April 1979, pages 56,57 published by: Arbeitsgemeinschaft der Bitumen-Industrie Hamburg, DE. P.J. FLUSS et al.: "Gegenwartiger Stand der Asphaltwiederaufbereitungstechnik in den USA" * Page 56, left-hand column, lines 6-9, 11-13, footnote, right-hand column, lines 1-3; page 57, lines 38-49; figure 7 * *
GB periodical "CIVIL ENGINEERING", September 1979, pages 56-59, published by Morgan-Grampian Construction Press London, G.B. D.J. BROWN: "Energy saving from asphaltrecycling" * Page 59, right-hand column, lines 23-36 * *
NL periodical "WEGEN", Vol. 50, No. 11, November 1976, pages 327-358 published by: Wegen Boskoop, NL. R.A. BRZESOWSKY: "Enkele indrukken van de NAPA-conventie" * Page 344, center column, lines 21-25; right-hand column, lines 2-11 * *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5303999A (en) * 1989-07-31 1994-04-19 Cyclean, Inc. Apparatus for control of recycled asphalt production
US5322367A (en) * 1989-07-31 1994-06-21 Cyclean, Inc. Process control for recycled asphalt pavement drum plant
US5344229A (en) * 1989-07-31 1994-09-06 Cyclean, Inc. Angle and velocity adjustment of a hot mix asphalt drum when output gas temperatures are uneven
WO1992011983A1 (fr) * 1990-12-27 1992-07-23 Astec Industries, Inc. SECHEUR D'AGREGAT REJETANT MOINS DE NOx, DESTINE A ETRE UTILISE DANS UNE USINE PRODUISANT DE L'ASPHALTE
WO1993010952A1 (fr) * 1991-11-27 1993-06-10 Cyclean, Inc. Procede et appareil servant a produire de l'asphalte melange a chaud
US6267493B1 (en) * 1999-06-02 2001-07-31 Cmi Corporation Drum mixer having a plurality of isolated aggregate transport channels

Also Published As

Publication number Publication date
NL7906433A (nl) 1981-03-03
EP0024755A3 (fr) 1981-09-23

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Inventor name: SIPKEMA, JAN SJOUKE, IR.

Inventor name: MOURIK, CORNELIS

Inventor name: VAN VELDHOVEN, CORNELIS MARTINUS ALOUISIUS

Inventor name: ESHUIS, HARM DINAND

Inventor name: GELUK, EGBERT