EP0119328A2 - Drying-mixing drum for preparing bituminous mix, particularly by use of recovered material - Google Patents
Drying-mixing drum for preparing bituminous mix, particularly by use of recovered material Download PDFInfo
- Publication number
- EP0119328A2 EP0119328A2 EP83201481A EP83201481A EP0119328A2 EP 0119328 A2 EP0119328 A2 EP 0119328A2 EP 83201481 A EP83201481 A EP 83201481A EP 83201481 A EP83201481 A EP 83201481A EP 0119328 A2 EP0119328 A2 EP 0119328A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- drying
- burner
- air
- mixing drum
- recovered material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 title claims abstract description 48
- 239000010426 asphalt Substances 0.000 claims abstract description 14
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 claims description 3
- 238000006731 degradation reaction Methods 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims description 2
- 238000001764 infiltration Methods 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims description 2
- 210000002105 tongue Anatomy 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 101100116570 Caenorhabditis elegans cup-2 gene Proteins 0.000 description 1
- 241001052209 Cylinder Species 0.000 description 1
- 101100116572 Drosophila melanogaster Der-1 gene Proteins 0.000 description 1
- 208000002991 Ring chromosome 4 syndrome Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000763 evoking effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Images
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
- E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
- E01C19/1063—Controlling the operations
-
- 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
- E01C2019/1095—Mixing containers having a parallel flow drum, i.e. the flow of material is parallel to the gas flow
Definitions
- the present invention relates to a drying-mixing drum for preparing bituminous mix, particularly by use of recovered material.
- the main member of which is constituted by the drying-mixing drum, that is by a rotating cylinder provided with a burner, in which a suitable percent of recovered material and virgin material is subject to drying and mixing together with bitumen, asphalt or other fluid cementing material.
- a drying mixing drum particularly suitable for the treatment of recovered material, which drum combines the advantages of the constructional simplicity, the high efficiency with high percent of recovered material and the large and total variability of the composition from all recovered material to all virgin material with the most various intermediate percents.
- a drying-mixing drum comprising a rotating cylinder provided with a charging end with axial burner and with a discharging end, cha racterized in that it comprises means for controlling the amount of air fed to the burner at such a value as to allow drying and mixing of the introduced material, but not the combustion and the degradation of the bitumen contained in the recovered material possibly making part of said material.
- the above said means for controlling the amount of air consist in that the only feeding path for the entire necessary air passes through the burner, which is provided in its turn with means for forcing the air into the drum, adjusting the amount of the same according to the different requirements.
- the flame of the burner is put in condition to avoid damage of the bitumen of the recovered material, at the same time having the helpful effect of ensuring a suitabl.e temperature for the drying and mixing of the material and, thereof, for the formation of the desired bituminous mix.
- the whole material, both inert and recovered may thus be introduced near the burner, with consequent possibility of reaching high levels of efficiency with high percents of recovered material and very good quality of the finished product.
- the same drum may be enabled to work with virgin material only.
- a drying-mixing drum which basically comprises a long cylinder 1 provided with a pair of rings 2 and 3 for its support by means of suitable groups of idle rollers and with a central toothed ring4 for its slow ro tation by means of suitable motor-driven pinion.
- a plurality of longitudinal tongues 5 Inside the cylin der 1, fixed to the internal wall thereof, there are arranged a plurality of longitudinal tongues 5, whose function is to homogenize the material during its movement caused by the inclination of the longitudinal axis of the cylinder, from one end to the other of the same cylinder.
- the cylinder 1 has a charging end 20 (on the right, looking at Fig. I, which is closed by a cover 6 and to which a burner 7, a material supply hopper 8 and a feed pipe 9 for fluid cementing material, in particularly bitumen, are associated.
- the burner 7 has its mouth 10 housed in a chamber 11 together with a small tube 12 for the formation of a pilot flame for the firing of the burner. Said mouth is fed in known manner with sui table fuel and further receives the necessary air for the combustion through one feed way 13, to which a prefixed flow of air is delivered in forced and controlled manner by a fan 14 with a motor 15, which fan sucks air from a variable width mouth 16 in the sense of the arrow F of Fig. 3.
- the hopper 8 in its turn, is provided with a pair of feed chutes 17, which, by diverging progressively from one another, bring the material to diametrally opposed points of the charging end of the cylinder 1 (fig. 2). As shown in Fig. 1, there are arranged inclined radial tongues 18, which distribute the material along the circumference of the cylinder and on the several longitudinal tongues 5.
- a pressure sensor 19 which is schematically illustrated in Fig. 1.
- the cylinder 1 has moreover a discharging end 21 (on the left, looking at Fig. 1), which includes a discharging mouth 22, from which a smoke sucking pipe 23 goes off.
- a throttle valve 24 driven by a motor 25 controlled by the pressure sensor 19.
- a prefixed percent of recovered aggregate and virgin aggregate (for example, 70% and 30%, respectively) is introduced into the drum through the hopper 8 and distributed along the circumference of the cylinder 1 by means of the inclined tongues 18.
- the flame of the burner 7 is thus able to produce a suf ficient temperature to dry and mix the introduced material, to which bitumen or other fluid cementing material introduced through the pipe 9 is added later on, but is not able to cause the combustion of the bitumen contained in the recovered aggregate.
- the entire cylinder is therefore used for mixing the materials, thus obtaining consequently a finished product of good quali ty with high percent of recovered material.
- the bituminous mix thus obtained is finally discharged through the outlet mouth 22.
- drum illustrated in the drawings can promptly be used also for the production of bituminous mix starting from virgin material only. In such case, in fact, it is sufficient to adjust suitably the flame produced by the burner.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Drying Of Solid Materials (AREA)
- Road Paving Machines (AREA)
Abstract
The drum is provided with a burner (7), which is made operating with controlled amount of air so as to avoid that its flame causes the combustion of the bitumen contained in the recovered material. Bituminous mixes of very good quality with high percent of recovered material can thus be obtained.
Description
- The present invention relates to a drying-mixing drum for preparing bituminous mix, particularly by use of recovered material.
- It is known the present trend to reuse the material recovered from asphalt pavements to prepare new bituminous mix ready for the use {E.S.D.-A. System).
- There are already available in the market several recycling plants, the main member of which is constituted by the drying-mixing drum, that is by a rotating cylinder provided with a burner, in which a suitable percent of recovered material and virgin material is subject to drying and mixing together with bitumen, asphalt or other fluid cementing material.
- In connection with this drying-mixing drum, in all the known plants there is the problem of avoiding that a too high overheat ing of the bitumen contained in the recovered material causes the combustion or the degradation of the same bitumen, thereby damaging the characteristics thereof and giving rise to a product of bad quality.
- In a drum of known type the above said problem has been solved by introducing the recovered material into the middle section of the drum, far from the end in which the burner is arranged and the virgin material is introduced. The latter is brought to high temperature by the flame of the burner and then largely transmits the heat to the recovered material by contact when, from the middle section of the drum on, the mixing of the two materials begins. There results from this the main drawback of this known drum, which is to exploit only a half part of the drum for the mixing, with consequent low efficiency of the plant. Moreover, it is absolutely necessary to employ a not-negligible quantity of virgin material with consequent low percent of recovered material in the finished product. The working of the plant with only recovered material is then quite inconceivable.
- In another drum of known type the same problem has been solved, on the contrary, by providing the burner with a suitably bored flame shielding cone, which has the function of shielding the bitumen of the recovered material from the flame radiation and distributing the flow of hot gases evenly inside the drum, thereby preventing the formation of localized peaks of temperature, which would cause the combustion of the bitumen. All the material (reco vered and virgin) may thus be introduced into the drum near the burner and the whole extension of the drum may be exploited to obtain a product of good quality and with high percent of recovered material; since the heating of the recovered material is direct, between gas and material, the absence of virgin material may even be conceived. On the other hand, as a consequence of the use of the flame shield, there are the drawbacks of an increased constructional complexity, a low thermal efficiency and the neces sity of a troubled work of removal of the flame shield in case of use of virgin material only.
- In view of such a state of the art, it is object of the present invention to realize a drying mixing drum, particularly suitable for the treatment of recovered material, which drum combines the advantages of the constructional simplicity, the high efficiency with high percent of recovered material and the large and total variability of the composition from all recovered material to all virgin material with the most various intermediate percents.
- According to the invention, this object has been reached by a drying-mixing drum, comprising a rotating cylinder provided with a charging end with axial burner and with a discharging end, cha racterized in that it comprises means for controlling the amount of air fed to the burner at such a value as to allow drying and mixing of the introduced material, but not the combustion and the degradation of the bitumen contained in the recovered material possibly making part of said material.
- That is, air is fed to the burner at an almost stoichiometric ratio with the fuel to be burnt, so that a subitant-ially inert at mosphere, containing oxygen in negligible quantity, is produced inside the drum.
- More precisely, according to a preferred embodiment of the present invention, the above said means for controlling the amount of air consist in that the only feeding path for the entire necessary air passes through the burner, which is provided in its turn with means for forcing the air into the drum, adjusting the amount of the same according to the different requirements.
- There are further provided means for maintaining inside the cylinder a selected positive pressure able to avoid secundary and uncontrolled infiltrations of air, which would occur if a pressure lower than that existing outside set up inside the drum.
- In this way, without any complicated mechanical device, the flame of the burner is put in condition to avoid damage of the bitumen of the recovered material, at the same time having the helpful effect of ensuring a suitabl.e temperature for the drying and mixing of the material and, thereof, for the formation of the desired bituminous mix. The whole material, both inert and recovered, may thus be introduced near the burner, with consequent possibility of reaching high levels of efficiency with high percents of recovered material and very good quality of the finished product. At the same time, without any structural change but mere Iy through suitable adjustment of the burner flame, the same drum may be enabled to work with virgin material only.
- An embodiment of the drum according to the invention is illustrated for better clarity, but without any limiting intention, in the enclosed drawings, in which:
- Fig. I shows a drying-mixing drum according to the invention in axial section along line I-I of Fig. 2;
- Fig. 2 shows said drum in transversal section along line II-II of Fig. 1;
- Fig. 3 shows the burner and the corresponding air forced feed group, included in said drum, from left with respect to Fig. 1.
- With reference to the drawings, there is shown a drying-mixing drum, which basically comprises a
long cylinder 1 provided with a pair ofrings longitudinal tongues 5, whose function is to homogenize the material during its movement caused by the inclination of the longitudinal axis of the cylinder, from one end to the other of the same cylinder. - The
cylinder 1 has a charging end 20 (on the right, looking at Fig. I, which is closed by acover 6 and to which aburner 7, a material supply hopper 8 and afeed pipe 9 for fluid cementing material, in particularly bitumen, are associated. - The
burner 7 has itsmouth 10 housed in achamber 11 together with asmall tube 12 for the formation of a pilot flame for the firing of the burner. Said mouth is fed in known manner with sui table fuel and further receives the necessary air for the combustion through onefeed way 13, to which a prefixed flow of air is delivered in forced and controlled manner by afan 14 with amotor 15, which fan sucks air from avariable width mouth 16 in the sense of the arrow F of Fig. 3. - The
hopper 8, in its turn, is provided with a pair offeed chutes 17, which, by diverging progressively from one another, bring the material to diametrally opposed points of the charging end of the cylinder 1 (fig. 2). As shown in Fig. 1, there are arranged inclinedradial tongues 18, which distribute the material along the circumference of the cylinder and on the severallongitudinal tongues 5. - The
pipe 9, in its turn, enters inside thecylinder 1 and deve lops parallelly to the axis thereof to such a distance that its delivery flow is not directly affected by the burner flame. - At the charging end of the
cylinder 1 there is finally arranged apressure sensor 19, which is schematically illustrated in Fig. 1. - The
cylinder 1 has moreover a discharging end 21 (on the left, looking at Fig. 1), which includes adischarging mouth 22, from which asmoke sucking pipe 23 goes off. In saidpipe 23 there is inserted a throttle valve 24 driven by amotor 25 controlled by thepressure sensor 19. - In the operation, a prefixed percent of recovered aggregate and virgin aggregate (for example, 70% and 30%, respectively) is introduced into the drum through the
hopper 8 and distributed along the circumference of thecylinder 1 by means of theinclined tongues 18. By suitable adjustment of the amount of air for ced through theburner 7 by thefan 14 and with a suitable pressure maintained by the valve 24, adjusted by the signal detected by thepressure sensor 19 in the chargingend 20, it is acted in such a way that the burner has available a suitably metered amount of oxygen and secundary suctions of air by negative pressure occur. The flame of theburner 7 is thus able to produce a suf ficient temperature to dry and mix the introduced material, to which bitumen or other fluid cementing material introduced through thepipe 9 is added later on, but is not able to cause the combustion of the bitumen contained in the recovered aggregate. The entire cylinder is therefore used for mixing the materials, thus obtaining consequently a finished product of good quali ty with high percent of recovered material. The bituminous mix thus obtained is finally discharged through theoutlet mouth 22. - On the other hand, it is clear that the drum illustrated in the drawings can promptly be used also for the production of bituminous mix starting from virgin material only. In such case, in fact, it is sufficient to adjust suitably the flame produced by the burner.
Claims (4)
1. Drying-mixing drum for preparing bituminous mix, particular ly by use of recovered material, comprising a rotating cylinder with a charging end with axial burner and with a discharging end, characterized in that it comprises means for controlling the amount of air fed to the burner at such a value as to allow drying and mixing of the introduced matesrial, but not the combustion or the degradation of the bitumen contained in the recovered material possibly making part of said material.
2. Drying-mixing drum according to claim 1, characterized in that said means comprise one air feed way passing through the burner, which is provided with means for forced and controlled introduction of air, and means for maintaining inside the cylinder a selected positive pressure able to avoid secundary and in- controlled infiltrations of air, which would occur if a pressure lower than that existing outside set up inside the drum.
3. Drying-mixing drum according to claim 2, characterized in that said means for forced and controlled introduction of air consist of a fan provided with driving motor and of a variable- width suction mouth.
4. Drying-mixing drum according to claim 2, characterized in that said means for maintaining a selected pressure comprise a pressure sensor inserted in the cylinder near the burner and a valve system inserted in a smoke sucking pipe and controlled by said pressure sensor.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT20175/83A IT1199992B (en) | 1983-03-21 | 1983-03-21 | DRYER-MIXER DRUM FOR THE PREPARATION OF BITUMINOUS CONGLOMERATE, PARTICULARLY THROUGH THE USE OF RECOVERED MATERIAL |
IT2017583 | 1983-03-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0119328A2 true EP0119328A2 (en) | 1984-09-26 |
EP0119328A3 EP0119328A3 (en) | 1985-12-27 |
Family
ID=11164425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83201481A Withdrawn EP0119328A3 (en) | 1983-03-21 | 1983-10-17 | Drying-mixing drum for preparing bituminous mix, particularly by use of recovered material |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0119328A3 (en) |
ES (1) | ES8504301A1 (en) |
IT (1) | IT1199992B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1022391A1 (en) * | 1999-01-11 | 2000-07-26 | Heijmans Infrastructuur & Milieu B.V. | Process for recycling tar and/or bitumen containing material comprising thermal conversion in combination with the production of asphalt |
WO2011047705A1 (en) * | 2009-10-23 | 2011-04-28 | Loesche Gmbh | Method and system for producing asphalt mixture |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3674242A (en) * | 1971-01-04 | 1972-07-04 | Clarence K Stewart | Preparation of asphalt paving material |
US4089508A (en) * | 1976-02-18 | 1978-05-16 | Alliance Industries, Inc. | Method of processing bituminous paving mixtures and apparatus therefor |
US4143972A (en) * | 1978-02-21 | 1979-03-13 | Boeing Construction Equipment Company | Combustion control system for bituminous drum mixers |
DE2827608A1 (en) * | 1978-06-23 | 1980-01-10 | Graham K P & Ass Pty | Bituminous aggregate prodn. - using control systems to improve product quality and consistency |
-
1983
- 1983-03-21 IT IT20175/83A patent/IT1199992B/en active
- 1983-10-17 EP EP83201481A patent/EP0119328A3/en not_active Withdrawn
- 1983-10-31 ES ES526929A patent/ES8504301A1/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3674242A (en) * | 1971-01-04 | 1972-07-04 | Clarence K Stewart | Preparation of asphalt paving material |
US4089508A (en) * | 1976-02-18 | 1978-05-16 | Alliance Industries, Inc. | Method of processing bituminous paving mixtures and apparatus therefor |
US4143972A (en) * | 1978-02-21 | 1979-03-13 | Boeing Construction Equipment Company | Combustion control system for bituminous drum mixers |
DE2827608A1 (en) * | 1978-06-23 | 1980-01-10 | Graham K P & Ass Pty | Bituminous aggregate prodn. - using control systems to improve product quality and consistency |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1022391A1 (en) * | 1999-01-11 | 2000-07-26 | Heijmans Infrastructuur & Milieu B.V. | Process for recycling tar and/or bitumen containing material comprising thermal conversion in combination with the production of asphalt |
WO2011047705A1 (en) * | 2009-10-23 | 2011-04-28 | Loesche Gmbh | Method and system for producing asphalt mixture |
RU2509838C2 (en) * | 2009-10-23 | 2014-03-20 | Лёше Гмбх | Method and device for production of asphalt mixture |
US8882899B2 (en) | 2009-10-23 | 2014-11-11 | Loesche Gmbh | Method and plant for producing asphalt mixture |
Also Published As
Publication number | Publication date |
---|---|
IT1199992B (en) | 1989-01-05 |
ES526929A0 (en) | 1985-04-16 |
ES8504301A1 (en) | 1985-04-16 |
EP0119328A3 (en) | 1985-12-27 |
IT8320175A0 (en) | 1983-03-21 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
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AK | Designated contracting states |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19860506 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: D'AMELIO, LUCIO Inventor name: MARCHETTI, SERGIO LUCIANO |