WO2013064851A1 - Drying cylinder for blasting of the unburnt smokes - Google Patents

Drying cylinder for blasting of the unburnt smokes Download PDF

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Publication number
WO2013064851A1
WO2013064851A1 PCT/IB2011/002643 IB2011002643W WO2013064851A1 WO 2013064851 A1 WO2013064851 A1 WO 2013064851A1 IB 2011002643 W IB2011002643 W IB 2011002643W WO 2013064851 A1 WO2013064851 A1 WO 2013064851A1
Authority
WO
WIPO (PCT)
Prior art keywords
smokes
combustion chamber
thin
chamber
unburnt
Prior art date
Application number
PCT/IB2011/002643
Other languages
French (fr)
Inventor
Roberto VISANI
Original Assignee
Visani Roberto
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 Visani Roberto filed Critical Visani Roberto
Priority to PCT/IB2011/002643 priority Critical patent/WO2013064851A1/en
Publication of WO2013064851A1 publication Critical patent/WO2013064851A1/en

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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
    • E01C2019/1081—Details not otherwise provided for
    • E01C2019/109—Mixing containers having a counter flow drum, i.e. the flow of material is opposite to the gas flow

Definitions

  • the invention refers to a drying cylinder for blasting of the unburnt smokes able to contain most of the toxic smokes generated by burning of part of the recycled material and bitumen coming from demolished road surfaces and to improve the combustion.
  • apparatuses are known realized with big dimension cylinders and outside engines to rotate said cylinders long the inclined longitudinal axis. These apparatuses are essentially formed to a drying chamber, a combustion chamber and, in a lot of cases, a mixer.
  • the drying chamber is divided to the combustion chamber by a thin-plate orifice with openings, as described in the document US-A-4207062, or with thin-place orifice with central opening with conical structure, as described in the document EP 1624109 to obtain a Venturi effect.
  • the thin-plate orifices known in the art however, have openings also onto the outside parts of the thin-plate orifice, from which there is the passage of smokes from the combustion chamber to the drying chamber.
  • the recycled material coming to the milling demolition of earlier road surfaces, is introduced from a hopper placed upper the combustion chamber.
  • the heat generated from the burner flame overheats the introduced material generating toxic smokes, known as blue smokes, for the presence in the recycled material of oily substances of the bitumen, humidity and other elements with low fusion point.
  • toxic smokes known as blue smokes
  • These smokes licking the inside upper part of the cylinder, go from the combustion chamber to the drying chamber for going outside through an opening of the drying chamber, causing a serious damage for the environment.
  • some plants are equipped with big dimension filters, able to break down in large part the pollutants.
  • Aim of the present invention is to break down the toxic smokes created inside the combustion chamber essentially for not complete combustion of the recycled material and to bring said smokes in contact with the burner flame, with necessary times to complete most of the combustion.
  • the present invention allows to confine the most part of the smokes inside the combustion chamber and, completing their combustion, to obtain important breaking down of the pollutants.
  • Other aim permits to the subject-matter of the invention is to save the filters placed at the exit of the drying chamber from the unburnt created to the head material, known as blue smokes.
  • Further aim given to the invention is that raising the temperature inside the combustion chamber with the complete combustion there is a better preparation of the mixture of the recycled materials with the inert materials of first use introduced with belt conveyor from the upper entrance of the drying chamber.
  • the drying cylinder is illustrated in a merely indicative and not limiting way in the drawings of figures 1 , 2 and 3 of sheets 1, 2 and 3.
  • sheet 1 figure 1 is longitudinal section view of an apparatus for the production of material for road surface according to the invention.
  • sheet 2 figure 2 is longitudinal section view of the sealing system of the gases that develop in combustion chamber obliged to pass only between the flame and the thin-plate orifice.
  • sheet 3 is section view of the slide of the recycled materials and the propelled blades for the gas sealing in combustion chamber.
  • the drying cylinder according to the invention comprises an angulated bearing cylinder 1 equipped with engines 2 for the rotation long the longitudinal axis.
  • the bearing cylinder 1 consists of a drying chamber 3, a combustion chamber 4 and a mixer 5.
  • the angulated bearing cylinder 1 provides an entrance 7 for the material of first use 8 and an exit 9 of mixed material to be used in road surfaces .
  • the combustion chamber 4 is separated to the mixer 5 through a thin-plate orifice 13 with opening 14 from which, by extraction shovel 15, the material in working passes in final step to the mixer 5.
  • the angulated bearing cylinder 1 is, moreover, equipped with hopper 16 in connection, on the base of known art, with the combustion chamber 4.
  • the drying chamber 3 and the combustion chamber 4 are divided through a thin-plate orifice 20 having upper vertical wall 21 to stop the smokes coming from the combustion chamber 4 and lower opening 22 for the passing in running of the first use dried materials 8 in movement to the exit 9 by means of the angle of the cylinder 1.
  • angulated propelled blades 23 are provided whose, with the recycled materials 19 in moving, prevent gases of the combustion chamber to pass through thing opening in the drying chamber 3.
  • the thin-plate orifice 20 is equipped with a central hole 24 licked by the flame 12 of the burner 1 1.
  • the thin-plate orifice 1 1 is made of refractory steel.
  • the central hole 24 may be replaced by more holes. It is, further, present for more kept of the unburnt smokes before they come into the drying chamber 3 and to improve their breakdown, a cylindrical element 25 in refractory steel, placed inside the angulated bearing cylinder 1 upstream of the thin-plate orifice 20 in position to be longitudinally regulated.
  • the cylindrical element 25 provides a central hole 26 and a circular surface 27 with central hole 28 of the same diameter of the other central hole 26.
  • the material in working is put in advancement by helical surfaces 31, integral with the cylinder 1 and so in rotation with said cylinder, placed in such a way to determine a screw conveyor for the advancement of the material downstream of the cylinder 1.
  • the helical surfaces 31 with the material in working in advancement more contain the unburnt smokes between the thin-plate orifice 20, the outside part of the cylindrical element 25 and the circular surface 27.
  • the unburnt smokes licking the flame 12 and passing trough the central hole 24 meet the cylindrical element 25 which, overheated from the temperature of the flame 12, concurs to more break down the pollutants in the smokes coming to the combustion chamber 4.
  • the first use material 8 In working phase of the invented apparatus is actuated the introduction of the first use material 8 through the entrance 7 of the angulated bearing cylinder 1, generally actuated through belt conveyors.
  • the first use material 8 In the drying chamber 3 the first use material 8 is moved by mixing blades by engines 2 that transport it toward the exit determining a rain effect in which the material is dried trough the heat coming from the combustion chamber.
  • the first use material 8 then arrives between the helical surfaces 31 coming to the thin-plate orifice 20 to cross it through the lower opening 22.
  • the propelled blades 23 push the first use material 8 inside the combustion chamber 4, mixing said material with the recycled material 19.
  • the recycled material is introduced into the combustion chamber through the hopper 16 passing from the connection opening 17 to reach the lower part of the combustion chamber through the slide 18.
  • the recycled material 19 is introduced into the angulated bearing cylinder 1 also to the entrance 7 to be mixed with the first use material 8 in the drying chamber 3.
  • the recycled material 19 and the first use material 8 are moved by propelled blades 6 inside the combustion chamber 4 to go outside.
  • the smokes formed inside the combustion chamber are limited inside the same chamber upper from the vertical wall 21 and under from the material in motion and to the angulated propelled blades.
  • the smokes expanding are so obliged to go outside from the only possible exit, i.e. the central hole 24.
  • the smokes so come in contact with the flame 12 both in combustion chamber than in exit from the chamber crossing the flame 12 and the central hole 24 of the thin-plate orifice 20 with high temperature.
  • the strong heat present at the opening of the central hole 24 determines a further combustion with high temperature able to break down the pollutants present in the smokes.
  • the heat present inside the cylindrical element 25 further breaks down the pollutants of the smokes.
  • the heat generated inside the combustion chamber thanks to the smokes confined in its inside determine, moreover, a better heating of the recycled material 19 and the first use material 8 with better mixture of the materials together.
  • the extraction shovel 15 and the opening 14 the recycled material 19 and first use material 8 reach the mixer 5 and then go outside mixed through the exit 9.
  • the flame 12 goes to lick other holes present onto the thin-plate orifice 20 to be heated with high temperature.
  • the invention is possible of changing all part of the present inventive subject matter. All the details, further, are to be replaced with other technically equivalent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The drying cylinder comprises a drying chamber (3) and a combustion chamber (4) separated to a thin-plate orifice (20). An upper vertical wall (21) to stop the smokes coming from the combustion chamber (4) and a lower opening (22) are provided. Angulated propelled blades (23) with the recycling material (19) in flowing prevent to the gases of the combustion chamber (4) to arrive, through said lower opening (22), to the drying chamber (3) so to have the smokes created inside the combustion chamber (4) confined to inside compelled to go out passing through the flame (12) and the central hole (24) of the thin-plate orifice (20) with high temperature, determining a further combustion at high temperature suitable to demolish the pollutants present in the smokes.

Description

"Drying cylinder for blasting of the unburnt smokes".
The invention refers to a drying cylinder for blasting of the unburnt smokes able to contain most of the toxic smokes generated by burning of part of the recycled material and bitumen coming from demolished road surfaces and to improve the combustion. In the field of machinery for asphalt for road surfaces apparatuses are known realized with big dimension cylinders and outside engines to rotate said cylinders long the inclined longitudinal axis. These apparatuses are essentially formed to a drying chamber, a combustion chamber and, in a lot of cases, a mixer. The drying chamber is divided to the combustion chamber by a thin-plate orifice with openings, as described in the document US-A-4207062, or with thin-place orifice with central opening with conical structure, as described in the document EP 1624109 to obtain a Venturi effect. The thin-plate orifices known in the art, however, have openings also onto the outside parts of the thin-plate orifice, from which there is the passage of smokes from the combustion chamber to the drying chamber. The recycled material, coming to the milling demolition of earlier road surfaces, is introduced from a hopper placed upper the combustion chamber. The heat generated from the burner flame overheats the introduced material generating toxic smokes, known as blue smokes, for the presence in the recycled material of oily substances of the bitumen, humidity and other elements with low fusion point. These smokes, licking the inside upper part of the cylinder, go from the combustion chamber to the drying chamber for going outside through an opening of the drying chamber, causing a serious damage for the environment. In order to minimize pollution some plants are equipped with big dimension filters, able to break down in large part the pollutants. Aim of the present invention is to break down the toxic smokes created inside the combustion chamber essentially for not complete combustion of the recycled material and to bring said smokes in contact with the burner flame, with necessary times to complete most of the combustion. In this way it is avoid that the toxic smokes generated into the combustion chamber directly passed into the drying chamber to go outside or to be treated through filtering devices. The present invention, in fact, allows to confine the most part of the smokes inside the combustion chamber and, completing their combustion, to obtain important breaking down of the pollutants. Other aim permits to the subject-matter of the invention is to save the filters placed at the exit of the drying chamber from the unburnt created to the head material, known as blue smokes. Further aim given to the invention is that raising the temperature inside the combustion chamber with the complete combustion there is a better preparation of the mixture of the recycled materials with the inert materials of first use introduced with belt conveyor from the upper entrance of the drying chamber. The drying cylinder is illustrated in a merely indicative and not limiting way in the drawings of figures 1 , 2 and 3 of sheets 1, 2 and 3. In detail in sheet 1 figure 1 is longitudinal section view of an apparatus for the production of material for road surface according to the invention. In sheet 2 figure 2 is longitudinal section view of the sealing system of the gases that develop in combustion chamber obliged to pass only between the flame and the thin-plate orifice. In sheet 3 the figure 3 is section view of the slide of the recycled materials and the propelled blades for the gas sealing in combustion chamber. In a preferred but not exclusive embodiment the drying cylinder according to the invention comprises an angulated bearing cylinder 1 equipped with engines 2 for the rotation long the longitudinal axis. The bearing cylinder 1 consists of a drying chamber 3, a combustion chamber 4 and a mixer 5. Inside the bearing cylinder 1 are placed propelled blades 6 in shape and number suitable for the drying chamber 3, the combustion chamber 4 and the mixer 5. The angulated bearing cylinder 1 provides an entrance 7 for the material of first use 8 and an exit 9 of mixed material to be used in road surfaces . Onto the upper part of the angulated bearing cylinder 1 an opening 10 is provided for the smokes exit. Inside the angulated bearing cylinder 1 a burner 11 is present generating a flame 12 into the combustion chamber 4. The combustion chamber 4 is separated to the mixer 5 through a thin-plate orifice 13 with opening 14 from which, by extraction shovel 15, the material in working passes in final step to the mixer 5. The angulated bearing cylinder 1 is, moreover, equipped with hopper 16 in connection, on the base of known art, with the combustion chamber 4. Under the opening 17 of connection of the hopper 16 with the combustion chamber 4 a slide 18 is present through which the recycling material 19 reaches the under part of the combustion chamber 4. The drying chamber 3 and the combustion chamber 4 are divided through a thin-plate orifice 20 having upper vertical wall 21 to stop the smokes coming from the combustion chamber 4 and lower opening 22 for the passing in running of the first use dried materials 8 in movement to the exit 9 by means of the angle of the cylinder 1. In correspondence with the lower opening 22 angulated propelled blades 23 are provided whose, with the recycled materials 19 in moving, prevent gases of the combustion chamber to pass through thing opening in the drying chamber 3. The thin-plate orifice 20 is equipped with a central hole 24 licked by the flame 12 of the burner 1 1. The thin-plate orifice 1 1 is made of refractory steel. In further embodiment the central hole 24 may be replaced by more holes. It is, further, present for more kept of the unburnt smokes before they come into the drying chamber 3 and to improve their breakdown, a cylindrical element 25 in refractory steel, placed inside the angulated bearing cylinder 1 upstream of the thin-plate orifice 20 in position to be longitudinally regulated. The cylindrical element 25 provides a central hole 26 and a circular surface 27 with central hole 28 of the same diameter of the other central hole 26. In the space 29 comprised between the outside borders 30 of the circular surface 27 and the inside part of the angulated bearing cylinder 1, the material in working is put in advancement by helical surfaces 31, integral with the cylinder 1 and so in rotation with said cylinder, placed in such a way to determine a screw conveyor for the advancement of the material downstream of the cylinder 1. The helical surfaces 31 with the material in working in advancement more contain the unburnt smokes between the thin-plate orifice 20, the outside part of the cylindrical element 25 and the circular surface 27. The unburnt smokes licking the flame 12 and passing trough the central hole 24 meet the cylindrical element 25 which, overheated from the temperature of the flame 12, concurs to more break down the pollutants in the smokes coming to the combustion chamber 4. In working phase of the invented apparatus is actuated the introduction of the first use material 8 through the entrance 7 of the angulated bearing cylinder 1, generally actuated through belt conveyors. In the drying chamber 3 the first use material 8 is moved by mixing blades by engines 2 that transport it toward the exit determining a rain effect in which the material is dried trough the heat coming from the combustion chamber. The first use material 8 then arrives between the helical surfaces 31 coming to the thin-plate orifice 20 to cross it through the lower opening 22. The propelled blades 23 push the first use material 8 inside the combustion chamber 4, mixing said material with the recycled material 19. The recycled material is introduced into the combustion chamber through the hopper 16 passing from the connection opening 17 to reach the lower part of the combustion chamber through the slide 18. In other embodiment of the invention the recycled material 19 is introduced into the angulated bearing cylinder 1 also to the entrance 7 to be mixed with the first use material 8 in the drying chamber 3. The recycled material 19 and the first use material 8 are moved by propelled blades 6 inside the combustion chamber 4 to go outside. The smokes formed inside the combustion chamber are limited inside the same chamber upper from the vertical wall 21 and under from the material in motion and to the angulated propelled blades. The smokes expanding are so obliged to go outside from the only possible exit, i.e. the central hole 24. The smokes so come in contact with the flame 12 both in combustion chamber than in exit from the chamber crossing the flame 12 and the central hole 24 of the thin-plate orifice 20 with high temperature. The strong heat present at the opening of the central hole 24 determines a further combustion with high temperature able to break down the pollutants present in the smokes. The heat present inside the cylindrical element 25 further breaks down the pollutants of the smokes. The heat generated inside the combustion chamber thanks to the smokes confined in its inside determine, moreover, a better heating of the recycled material 19 and the first use material 8 with better mixture of the materials together. By the extraction shovel 15 and the opening 14 the recycled material 19 and first use material 8 reach the mixer 5 and then go outside mixed through the exit 9. In other embodiment the flame 12 goes to lick other holes present onto the thin-plate orifice 20 to be heated with high temperature. The invention is possible of changing all part of the present inventive subject matter. All the details, further, are to be replaced with other technically equivalent.

Claims

CLAIMS.
1) Drying cylinder for blasting of the unburnt smokes comprising a drying chamber (3) and a combustion chamber (4) separates to a thin-plate orifice (20), characterized in the fact to have upper vertical wall (21) to stop the smokes coming from the combustion chamber (4) and lower opening (22) where angulated propelled blades (23) whose with the recycling material (19) in flowing prevent to the gases of the combustion chamber to arrive, through said lower opening (22), to the drying chamber (3) so to have the smokes created inside the combustion chamber (4) confined to inside compelled to go out passing through the flame (12) and the central hole
(24) of the thin-plate orifice (20) with high temperature, determining a further combustion at high temperature suitable to demolish the pollutants present in the smokes.
2) Drying cylinder for blasting of the unburnt smokes, as to the previous claim, characterized in the fact to have a fireproof steel cylindrical element
(25) placed inside the angulated bearing cylinder (1) in a position to be longitudinally regulated, having a central hole (26) and a circular surface (27) with central hole (28) to contain the unburnt smokes between the thin- plate orifice (20), the outside part of the cylindrical element (25) and the circular surface (27) so helping to further demolish the pollutants in the smokes coming from the combustion chamber (4).
PCT/IB2011/002643 2011-11-03 2011-11-03 Drying cylinder for blasting of the unburnt smokes WO2013064851A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2011/002643 WO2013064851A1 (en) 2011-11-03 2011-11-03 Drying cylinder for blasting of the unburnt smokes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2011/002643 WO2013064851A1 (en) 2011-11-03 2011-11-03 Drying cylinder for blasting of the unburnt smokes

Publications (1)

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WO2013064851A1 true WO2013064851A1 (en) 2013-05-10

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207062A (en) 1978-05-26 1980-06-10 Moench Frank F Heating and mixing apparatus for asphaltic pavement
US4988207A (en) * 1989-04-05 1991-01-29 Ermont C. M. Drying/coating drum for the preparation of bituminous coated products, comprising an improved burner
US5558432A (en) * 1994-06-14 1996-09-24 Swisher, Jr.; George W. Drum mixer having a combined heating/mixing zone with aggregate entry at both ends
EP1624109A1 (en) 2004-08-03 2006-02-08 Ghirardelli Plants SRL Apparatus for recycling asphalt for production plants of bitumimous conglomerate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207062A (en) 1978-05-26 1980-06-10 Moench Frank F Heating and mixing apparatus for asphaltic pavement
US4988207A (en) * 1989-04-05 1991-01-29 Ermont C. M. Drying/coating drum for the preparation of bituminous coated products, comprising an improved burner
US5558432A (en) * 1994-06-14 1996-09-24 Swisher, Jr.; George W. Drum mixer having a combined heating/mixing zone with aggregate entry at both ends
EP1624109A1 (en) 2004-08-03 2006-02-08 Ghirardelli Plants SRL Apparatus for recycling asphalt for production plants of bitumimous conglomerate

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