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
• • 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

• This invention relates to a method and device to recycle bitumen containing used material, such as asphalt.
• used material such as asphalt.
• PR asphalt granules
• the asphalt application temperature (approx.175 degrees Celsius) due to emission problems, while because of that the fresh mineral granules have to be heated to clearly beyond (approx. 220 degrees Celsius) the asphalt application temperature, to be able to obtain the desired asphalt application temperature for the end product (mixture of PR and fresh material) .
• the drum wall will be heated externally and will heat the along the internal side of the spinning drum wall tumbling, rolling and advancing PR.
• the PR within the drum is contained within parallel, longitudinally extending pipes, wherein the wall of said pipes is heated externally and heats the PR moving along the internal side of said wall.
• the PR contacts a spinning wall part and is heated by it.
• the PR is like bulk material.
• bulk material means solidmaterial like debris, grains, particles, flakes, humps, etc., such that is can be poured or cast.
• Preferably recycling is on a continuous or semi-continuous basis. This particularly means, that PR is supplied through the one opening and discharged through the other opening. These openings can be present at the same or opposite sides of the installation. Preferably a more or less continuous stream of PR through the installation is maintained, while without interruption a quantity PR is processed, which is substantially bigger than the fill capacity of the installation.
• the PR is processed without altering the inclination of the element (s) passed by the PR.
• said elements can be designed with a fixed spinning axis, yielding a simplification and cost reduction.
• the installation is further preferably stationary, such that it can be dimensioned for large scale recycling.
• Preferably adding/removing of PR takes place such that within the installation a pressure can be maintained that is different from the environment.
• the supply and/or discharge of PR goes through a sluice or such sealing device.
• the supply and/or discharge of gases and/or liquids is carried out such that within the installation a pressure can be maintained that differs from the environment, for which a convenient seal can be applied.
• the installation has a pre heating part in which PR is indirectly heated by rest heat from the installation, e.g. from released steam.
• the pre heating part can be double walled. It can contain a the PR contacting and heating, spinning wall .
• the side of the wall contacting the PR can be provided with its contact surface increasing and/or movement of the PR influencing elements, such as ribs.
• the PR is heated in a damp environment.
• the desired end temperature of the PR between approx. 130 en 165 0 C
• the humidity and pneumatic pressure within the installation are adapted correspondingly. Therefore humid PR is preferably supplied to the installation, preferably with a humidity of at least approx. 0.5 or 1.0 or 1.5 wt%.
• the drawing shows in fig. 1-2 schematically non-limiting examples of embodiments.
• the double walled drum is used with a horizontal or from the PR entrance (left in the drawing) downward inclined extending body axis .
• the internal drum wall is driven by a motor (not shown) to spin around.
• the external drum wall is mounted rotation fixed.
• the internal drum wall is provided with inward projecting fixed blades, planks or such projections to, while the drum spins around, convey the into it poured PR in longitudinal drum direction towards the PR exit (to the right in the drawing) .
• Said PR transport is possibly gravity supported due to the inclined attitude of the drum.
• the annular gap shaped space between both drum walls has at the PR entrance a gas entrance to be fed by a heating gas, stemming from a hot gas generator (e.g. the hot combustion gasses of a burner) .
• a hot gas generator e.g. the hot combustion gasses of a burner
• PR is poured into the drum as a continuous stream of bulk material through the entrance and advances through it, wile tumbling/rolling/sliding, towards the PR exit while in the means time it is heated by contact with the drum wall.
• gasses e.g. steam and bitumen gas
• the hot gas generator At the PR exit from the drum released gasses (e.g. steam and bitumen gas) are preferably fed to the hot gas generator.
• the heating gas and PR flow in the same direction along the drum wall. In an alternative embodiment these two substances can flow mutually opposite (counter flow) . In that case the locations of the gas entrance and gas exit are changed.
• the entrances and exits for PR and hot gasses could be changed, such that the PR flows through the annular gap between the internal and external drum wall, while the heating gas flows within the internal drum wall.
• a single walled main drum is used, to which a drum like, double walled pre heating part is connected upstream.
• the main drum has double walled pipes, extending lengthwise of the main drum.
• the pipes are fixedly located within the drum and the drum is turned around its longitudinal axis.
• the pipes provide a capacity increase at equal space consumption by the installation.
• the heated surface area increases and the payload ration decreases.
• a compact and simple structure of the sealing structures between the moving and stationary parts of the drum is possible.
• the pipes are preferably arranged with their body axis at substantially equal distance to the body axis of the main drum, such as the drawing also shows. If the drum spins, the pipes follow a circle while turning around.
• PR is continuously fed to the pre heating part via a sluice.
• the PR is indirectly heated by from the PR within the main drum stemming steam/moisture and possibly different hot gasses. The steam then condenses and is discharged as condensate.
• the PR arrives into the main drum. There it is distributed over the pipes via a distribution element that is provided in the main drum.
• Hot gas from a generator is also supplied to the main drum.
• a supply channel for the hot gas extends centrally through the pre heating part and debouches at the upstream end in the main drum, centrally between the pipes.
• Via a manifold the hot gas is distributed over the annular spaces of the double walled pipes.
• the hot gas flows through the double wall of the pipes towards the downstream end of the main drum (to the right in the drawing) and arrives there via a manifold into a central discharge channel . Subsequently the gas is partly recirculated towards the generator and the rest comes, after passing of a heat exchanger, into the atmosphere.
• the heat exchanger is located within the supply channel for the combustion air.
• the hot gas thus remains outside the space within the main drum external of the double walled pipes.
• the PR leaves the main drum also to the right in the drawing and arrives e.g. within a mixer in which the PR, minerals and/or different substances can be added.
• the PR within the installation is present within a space that is sealed from the environment.
• the hot gas passes through the installation in a closed circuit.
• the steam and other gasses coming from the PR are collected and in a closed circuit passed on to a heat exchanger and preferably substantially as condensate discharged to the environment.
• the PR within the installation is preferably exposed to pneumatic over pressure. To obtain that, in the moisture circuit (coming from the PR) a sealing member is preferably provided.
• the drawing illustrates several preferred design parameters, such as temperatures (in °C) and flow rate (in e.g. Nm 3 /h) .
• temperatures in °C
• flow rate in e.g. Nm 3 /h
• the PR enters the installation at a temperature of approximately 10 0 C, exits the pre heating part and the main drum at a temperature of approximately 70 respectively 130-165 0 C.
• From the PR stemming moisture/steam of approx. 110 0 C is collected and supplied to the pre heating part and exits it as condensate with a temperature of approx. 90°C, such that most of the heat energy is transferred.
• Hot gas is supplied at a temperature of approx. 800 0 C and cools to approx. 425 0 C due to heating of the PR.

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• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Road Paving Machines (AREA)

Applications Claiming Priority (2)

Publications (1)

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Citations (1)

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• 2007
  • 2007-04-03 EP EP07747274A patent/EP2004912A1/de not_active Withdrawn
  • 2007-04-03 WO PCT/NL2007/000092 patent/WO2007117135A1/en active Application Filing

Patent Citations (1)

Non-Patent Citations (1)

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