EP2071080A2 - Verfahren zur Aufarbeitung und Rückgewinnung von Energie aus Bitumenagglomeraten - Google Patents

Verfahren zur Aufarbeitung und Rückgewinnung von Energie aus Bitumenagglomeraten Download PDF

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Publication number
EP2071080A2
EP2071080A2 EP08405298A EP08405298A EP2071080A2 EP 2071080 A2 EP2071080 A2 EP 2071080A2 EP 08405298 A EP08405298 A EP 08405298A EP 08405298 A EP08405298 A EP 08405298A EP 2071080 A2 EP2071080 A2 EP 2071080A2
Authority
EP
European Patent Office
Prior art keywords
rotating drum
bituminous
mix
bwm
heating
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Withdrawn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
EP08405298A
Other languages
English (en)
French (fr)
Other versions
EP2071080A3 (de
Inventor
Giuseppe Antonioli
Ivan Bordonzotti
Paolo Di Sabatino
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.)
Fapico AG
Original Assignee
Fapico AG
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 Fapico AG filed Critical Fapico AG
Publication of EP2071080A2 publication Critical patent/EP2071080A2/de
Publication of EP2071080A3 publication Critical patent/EP2071080A3/de
Withdrawn legal-status Critical Current

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    • 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
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
    • C10B47/28—Other processes
    • C10B47/30—Other processes in rotary ovens or retorts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
    • C10C3/00—Working-up pitch, asphalt, bitumen
    • C10C3/007—Working-up pitch, asphalt, bitumen winning and separation of asphalt from mixtures with aggregates, fillers and other products, e.g. winning from natural asphalt and regeneration of waste asphalt
    • 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

Definitions

  • the present invention relates to the sector of methods and plants used for converting, by means of a heat treatment, bituminous waste aggregates into materials which can be reutilised in the same field of application.
  • bituminous waste aggregates the granular material obtained from milling and screening of road surfaces, bituminous residue and other waste from the production of road asphalt such as, for example, the end-of-production remainders, batches of unused asphalt, batches of road asphalt which do not satisfy the product specifications and therefore cannot be used and any other material which is composed of mixtures of mineral (for example calcareous or siliceous) aggregate and natural or petrochemical bitumen.
  • the present invention concerns a method for upgrading and recovering energy from bituminous aggregates as described in the preamble of Claim 1, as well as a means for implementing said method as described in Claim 5.
  • bituminous waste mixes in the asphalt industry has already been known for some time.
  • the aim of reusing said mixes is associated with the possibility of converting a waste material with its associated disposal costs into a sellable product.
  • waste mix is recycled by mixing it in well-defined maximum percentage amounts with the virgin bitumen being produced.
  • This recycling is therefore necessarily performed at the premises of an asphalt manufacturer, something which proves to be on occasions a disadvantage owing to the large distances involved and the costs for transportation of the waste mix and the dependency on the virgin asphalt manufacturer who may impose their own commercial and technical conditions.
  • the aggregate material thus heated is then transferred into a storage silo which is suitably heat-insulated.
  • the hot aggregate material is mixed together with the bitumen and any other additives and then discharged into the transportation means which will transport it to the place of use.
  • the first possibility offered consists in adding the waste to the virgin aggregate and heating the two together inside the furnace.
  • the current technology uses two drums in parallel.
  • the two drums have an identical design: both of them are of the direct-flame type.
  • the second drum is used to heat solely the bituminous waste mix.
  • the first drum may operate at the normal working temperature, for example 150°C
  • the second drum for the reasons already mentioned beforehand, is limited to a maximum temperature of 90°C.
  • the smoke point i.e. the temperature at which a substance produces smoke, in the case of bitumen is around 180 - 200°C in an oxidizing atmosphere.
  • direct-flame heating also has the disadvantage of being very disadvantageous from an energy point of view, requiring a very high specific fuel consumption. High consumption is associated in particular with the fact that the combustion fumes exiting from the drum are still very hot and therefore still contain a lot of energy which can only be partly recovered.
  • the particular feature of this type of technology consists in the energy heating vector.
  • a burner which is physically separate from the receptacle containing the material to be heated is used.
  • the combustion flame is cooled by means of the injection of water which vaporizes generating a mixture of combusted fumes and steam which is then used for actually heating the material.
  • the object of the present invention is to provide a method for upgrading and recovering energy from bituminous aggregates which overcomes the abovementioned drawbacks and in particular results in a lower vapour emission, lower energy consumption and an improved thermal balance.
  • Figure 1 shows a diagram of the method for upgrading bituminous aggregates.
  • the bituminous waste mix to be treated is charged into the hopper 1 equipped with a compartment system which allows separation of the environment from the internal atmosphere of the apparatus.
  • Double-clapper unloaders, rotary valves or pairs of guillotines may be used as compartment systems.
  • a conveying system 3 such as, for example, a screw feeder, belt or vibrating chute performs continuous feeding to the heating drum 2.
  • the heating drum is kept constantly rotating and heated externally until temperatures of the drum surface ranging between about 200 and about 550° are obtained, depending on the process to be performed.
  • the material fed to the drum is deposited inside it and, as a result of its temperature inside the inner part 4 of the combustion chamber 5, is heated to the desired temperature.
  • the material in the drum occupies only the bottom part of the volume: as a result of rotation the material is continuously churned, always bringing fresh material into contact with the wall, thus increasing the heat exchange effect and mixing thereof.
  • the final heating temperature of the material is regulated by simultaneously varying the amount being fed and the speed of rotation of the drum (control of the stay time) and the surface temperature of the drum (control of the heat exchange power).
  • the drum is inserted inside a large-size combustion chamber lined with refractory material 5.
  • the combustion chamber contains one or more burners 6 operating with liquid or gas fuel such as methane gas, LPG, gas oil or LSC oils.
  • liquid or gas fuel such as methane gas, LPG, gas oil or LSC oils.
  • the same burners in the case where the method used envisages the production of aggregate, are designed to burn also the gases and vapours resulting from pyrolysis of the bitumen contained in the bituminous starting mixture.
  • the combustion air of the burners may be preheated inside a heat exchanger arranged so as to intercept the discharge fumes of the apparatus 9.
  • Pyrolysis is a thermochemical deposition process which is obtained by means of the application of heat and with the complete absence of an oxidising agent, in this case oxygen.
  • the exchange of heat between the combustion fumes and the drum is mainly due to irradiation effects hence the need for a large-size refractory chamber in order to increase the irradiating state thickness and the re-irradiation effect.
  • the combustion fumes may be used to dry or pre-heat the mix or for other direct uses or may be passed through an exchanger 9 preferably used to preheat the combustion air of the burners 6 or else for other heat-related functions, for example in order to produce process steam, heating water or the like.
  • heating of the mix may result in the formation of vapours and gases.
  • At low heating temperatures typically below 150°C, these are not formed so that the outlet 8 is solely composed of a flue for discharge into the atmosphere.
  • gases and vapours are formed, in particular in the case where said temperatures are within the pyrolysis range.
  • the outlet is combined with a device for suction of said vapours and gases, such as ventilators, blowers or Venturi ejectors.
  • the suction device is regulated so as to keep the discharge hopper 8 and therefore the inside of the drum 4 always under a vacuum at the desired value (a few mbar).
  • the vacuum is necessary in order to prevent part of the gases and vapours from being able to seep outside of the apparatus through the rotary seals with the consequent risk of fire or damage to objects or persons.
  • the gases and vapours thus drawn off, having a high calorific power, are then conveyed to the burners 6 which are installed inside the combustion chamber 5, supplementing or replacing entirely the use of the primary fuel (natural gas, gas oil, or the like).
  • the evaluation of the energy contribution of the gases and vapours to the overall consumption of the apparatus depends greatly on the characteristics of the incoming bituminous waste mix, and can be determined in particular depending on its bitumen content and its moisture level.
  • the material is then extracted from the apparatus from the bottom of the hopper 7 via a conveying system 10 such as, for example, a screw feeder, Redler conveyor or conveyor belt.
  • a conveying system 10 such as, for example, a screw feeder, Redler conveyor or conveyor belt.
  • the outlet also has a compartment system of the same type.
  • the outlet system is also provided with a system for cooling the aggregate produced 11.
  • the type of cooler depends on the conveying system used.
  • the screw feeder In the example of the screw feeder, the latter is enclosed inside a duct through which the cooling fluid (for example air or water) is passed.
  • the recovered heat may be used in a manner similar to the heat recovered from the combustion fumes of the apparatus.
  • the aggregate produced also contains the residual carbon part resulting from pyrolysis.
  • said carbon part is, compared to the bitumen fraction converted into gas and vapour, of a limited amount.
  • the carbon partly takes the form of a layer which covers the aggregate and partly takes the form of dust particles mixed with the aggregate as a result of rolling of the material inside the drum.
  • the quantity of carbon contained in the aggregate does not create problems, but, if necessary, it is possible to separate it and extract it downstream of the apparatus according to the invention by means of screening.
  • bituminous mix is heated in a controlled and inert atmosphere. Any bituminous vapours which may form at high heating temperatures remain "pure” and in continuous contact with the material, therefore ensuring conditions which are ideal for maintaining the characteristics of the bitumen.
  • bituminous mix is heated more slowly, thus avoiding the high temperature gradients which instead occur in the case of direct heating.
  • the throughput of any vapours produced during heating is substantially smaller than the throughput of vapours, smoke or any steam obtained in the case of direct fluid or flame heating. This results in a smoke-treatment system which is simpler, less costly and optimised only on the basis of the characteristics of the vapours to be treated.
  • the thermal balance of the heating process is substantially better than that of the existing technologies.
  • the combustion temperature In the case of heating systems based on a direct flame or with a mixture of fumes and steam, the combustion temperature must kept below certain limits in order to prevent burning of the bitumen.
  • the heat exchange efficiency may be calculated in a simple manner, for example: Inlet T fumes material to be heated - Outlet T fumes from the material Inlet T fumes material to be heated - Surround .
  • T * 100 ⁇
  • a possibility offered by the present invention relates to the production of aggregate using the bituminous waste mix as starting material. This is possible using heating temperatures of around 350-450°C. At these temperatures the bituminous fraction contained in the mix is converted by means of pyrolysis into gas/vapours and carbon. The largest part of the pyrolysis products consists in the gas and vapours fraction which also contains most of the calorific power of the bitumen.
  • this gaseous flow does not come into contact with flames and with oxygen so that it may be extracted from the apparatus according to the invention and used as a combustible gas for heating in place of or at least as a supplement to the primary fuel (natural gas or gas oil).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Architecture (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Processing Of Solid Wastes (AREA)
EP08405298A 2007-12-11 2008-12-04 Verfahren zur Aufarbeitung und Rückgewinnung von Energie aus Bitumenagglomeraten Withdrawn EP2071080A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH19272007A CH703226B1 (it) 2007-12-11 2007-12-11 Procedimento per la riqualifica e valorizzazione energetica di inerti bituminosi.

Publications (2)

Publication Number Publication Date
EP2071080A2 true EP2071080A2 (de) 2009-06-17
EP2071080A3 EP2071080A3 (de) 2012-09-12

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EP08405298A Withdrawn EP2071080A3 (de) 2007-12-11 2008-12-04 Verfahren zur Aufarbeitung und Rückgewinnung von Energie aus Bitumenagglomeraten

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EP (1) EP2071080A3 (de)
CH (1) CH703226B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011047705A1 (de) * 2009-10-23 2011-04-28 Loesche Gmbh Verfahren und anlage zum herstellen von asphaltmischgut
ITTO20120254A1 (it) * 2012-03-20 2012-06-19 Fenergia S R L Sistema e procedimento di distruzione delle emissioni di cov (composti organici volatili) per impianto di preparazione di agglomerati bituminosi, ed impianto di preparazione di agglomerati bituminosi dotato di tale sistema.
EP2264368A3 (de) * 2009-06-18 2017-12-06 Eisenmann SE Verfahren und Anlage zur Aufbereitung von Strassen-aufbruchmaterial
CN108300502A (zh) * 2018-04-02 2018-07-20 大庆高新区百世环保科技开发有限公司 一种含油污染物超净处理热脱附装置
CN118241522A (zh) * 2024-05-30 2024-06-25 山西中润路科科技有限公司 一种沥青混凝土的制备系统

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992001751A1 (en) 1990-07-23 1992-02-06 Seppo Aho A method of processing an asphalt mixture

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1526360A (en) * 1976-12-08 1978-09-27 Mendenhall R Apparatus and method for producing asphalt-aggregate compositions
US5083870A (en) * 1991-01-18 1992-01-28 Sindelar Robert A Asphalt plant with segmented drum and zonal heating
EP2004912A1 (de) * 2006-04-10 2008-12-24 Volker Stevin Materieel BV Wiederverwertung von bitumen mit altmaterial

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992001751A1 (en) 1990-07-23 1992-02-06 Seppo Aho A method of processing an asphalt mixture

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2264368A3 (de) * 2009-06-18 2017-12-06 Eisenmann SE Verfahren und Anlage zur Aufbereitung von Strassen-aufbruchmaterial
WO2011047705A1 (de) * 2009-10-23 2011-04-28 Loesche Gmbh Verfahren und anlage zum herstellen von asphaltmischgut
US8882899B2 (en) 2009-10-23 2014-11-11 Loesche Gmbh Method and plant for producing asphalt mixture
ITTO20120254A1 (it) * 2012-03-20 2012-06-19 Fenergia S R L Sistema e procedimento di distruzione delle emissioni di cov (composti organici volatili) per impianto di preparazione di agglomerati bituminosi, ed impianto di preparazione di agglomerati bituminosi dotato di tale sistema.
CN108300502A (zh) * 2018-04-02 2018-07-20 大庆高新区百世环保科技开发有限公司 一种含油污染物超净处理热脱附装置
CN118241522A (zh) * 2024-05-30 2024-06-25 山西中润路科科技有限公司 一种沥青混凝土的制备系统

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Publication number Publication date
EP2071080A3 (de) 2012-09-12
CH703226B1 (it) 2011-12-15

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