EP3524732B1 - Kaltrecycling vor ort mit einer heizungsanordnung mit einer heizung für asphaltzement und einer wärmemodifizierenden komponente - Google Patents

Kaltrecycling vor ort mit einer heizungsanordnung mit einer heizung für asphaltzement und einer wärmemodifizierenden komponente Download PDF

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Publication number
EP3524732B1
EP3524732B1 EP19155761.0A EP19155761A EP3524732B1 EP 3524732 B1 EP3524732 B1 EP 3524732B1 EP 19155761 A EP19155761 A EP 19155761A EP 3524732 B1 EP3524732 B1 EP 3524732B1
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EP
European Patent Office
Prior art keywords
asphalt cement
heater
heating assembly
asphalt
flow
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Application number
EP19155761.0A
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English (en)
French (fr)
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EP3524732A1 (de
Inventor
Richard Christian
Raymond Clark Baker IV
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Roadtec Inc
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Roadtec Inc
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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
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
    • F24H1/16—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form helically or spirally coiled
    • F24H1/165—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form helically or spirally coiled using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/026—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled and formed by bent members, e.g. plates, the coils having a cylindrical configuration
    • 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
    • E01C19/05—Crushing, pulverising or disintegrating apparatus; Aggregate screening, cleaning, drying or heating apparatus; Dust-collecting arrangements specially adapted therefor
    • 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
    • E01C19/08—Apparatus for transporting and heating or melting asphalt, bitumen, tar, or the like
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0024—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for combustion apparatus, e.g. for boilers

Definitions

  • the present invention relates to a cold in-place recycling (CIR) train according to the preamble of claim 1.
  • CIR cold in-place recycling
  • Roadway repair is often accomplished by overlaying the existing pavement (whether of concrete or asphalt paving material) with a new layer (often called a leveling course) of concrete or asphalt paving material. Without prior surface treatment, however, this method of repair generally results in the application of insufficient quantities of paving material in the rutted, potholed or otherwise damaged areas, because the overlay will be applied at the same rate per unit of roadway width in damaged areas (which have a greater depth to be filled across the width) as in the undamaged areas. The resulting reduced thickness in the overlay of the previously damaged areas will lead to renewed rutting or other wear damage in the new pavement in relatively short order.
  • milling the surface of the damaged pavement to a uniform surface elevation below the level of the damage will produce a road surface having a consistent elevation across the entire width of the roadway.
  • This repaving technique can be used to return the elevation of a damaged roadway to its original pre-damaged elevation, whereas the placement of a leveling course atop damaged but un-milled pavement will tend to raise the surface of the roadway or some portion thereof above its original elevation.
  • Roadway repair without milling can require the raising of road shoulders, guardrails and manhole covers and the adjustment of overpass clearances, which tasks are unnecessary if a proper milling technique is employed.
  • a use of milling prior to repaving can also permit ready establishment of the proper road grade and slope, and thereby avoid drainage and safety problems.
  • milling typically provides a rough surface that readily accepts and bonds with the new asphalt or other pavement overlay.
  • milling can provide raw material that can be reclaimed for use in the production of new paving materials.
  • a milling machine includes a milling drum with a plurality of cutter teeth mounted thereon which is contained within a milling drum housing.
  • the milling machine is adapted to be advanced across a roadway surface while the milling drum is rotated within the housing to "mill” the surface to remove asphaltic or Portland cement concrete pavement in preparation for recycling the pavement and/or in preparation for applying a pavement overlay.
  • the typical milling machine includes one or more conveyors to take the milled paving material from the vicinity of the milling drum and direct it away from the machine and into an adjacent dump truck.
  • a road stabilizer/reclaimer machine is similar to a milling machine in that it comprises a wheeled or track-driven vehicle that includes a milling drum with a plurality of cutter teeth mounted thereon which is contained within a milling drum housing.
  • the milling drum of a road stabilizer/reclaimer machine is generally employed to mill or pulverized an existing road bed or roadway to a greater depth than does a milling machine prior to repaving (usually called reclaiming) or prior to initial paving (usually called stabilizing), and it leaves the pulverized material in place.
  • CIR Cold in-place recycling
  • a milling machine is employed to remove damaged layers of pavement, and the removed paving material is processed, replaced on the roadway and compacted. If a roadway has good structural strength, CIR can be an effective treatment for all types of cracking, ruts and holes in pavement.
  • CIR can be used to repair roadways damaged by fatigue (alligator) cracking, bleeding (of excess asphalt cement), block cracking, corrugation and shoving, joint reflective cracking, longitudinal cracking, patching, polished aggregate, potholes, raveling, rutting, slippage cracking, stripping and transverse (thermal) cracking.
  • the root cause of the pavement failure should always be investigated to rule out base failure.
  • CIR can almost always be used when there is no damage to the base of the roadway.
  • CIR is only half as expensive as hot mix paving (i.e., paving with new asphalt paving material) while providing approximately 80% of the strength of hot mix paving.
  • CIR can be carried out with the aid of a milling machine or a road stabilizer/reclaimer machine that has been modified by mounting an additive spray bar in the milling drum housing to inject asphalt cement into the milling drum housing.
  • the asphalt cement is then thoroughly blended with the milled material by the milling drum.
  • This blended mixture may then be deposited on the roadway in the form of a windrow to be picked up by a suitably equipped asphalt paving machine, or it may be fed by the milling machine's discharge conveyor directly into the receiving hopper of an asphalt paving machine.
  • the asphalt cement component of the mixture must be supplied from a separate asphalt cement supply tank carried by a supply truck, vehicle, wheeled chassis or other mobile support that is typically coupled to the modified milling machine or road stabilizer/reclaimer machine.
  • the asphalt cement component is drawn directly from the tank on the supply truck and metered through an asphalt cement flow circuit to the spray bar in the milling drum housing.
  • the CIR process is carried out with a milling machine or stabilizer/reclaimer in train with a cold recycler machine such as the RT-500 that is made and sold by Roadtec, Inc. of Chattanooga, Tennessee.
  • the cold recycler machine may include a vibratory screen, a crusher, an onboard source of asphalt cement and a pugmill mixer.
  • the recycled paving material that is milled by the milling machine is transferred to the vibratory screen. Oversized material on the screen is conveyed into a crusher on the cold recycler machine, and material passing through the crusher is carried back to the screen by means of a return circuit.
  • Properly sized material is then mixed with asphalt cement from an onboard storage tank in the pugmill mixer. Because the onboard asphalt cement storage tank in a cold recycler machine is limited in size, it may be desirable to convey additional asphalt cement from a separate supply truck to the asphalt cement storage tank on the cold recycler machine, in order to insure that the CIR process can proceed without frequent stops to refill the asphalt cement storage tank on the cold recycler machine.
  • the primary component of the new pavement is paving material that is removed from the roadway.
  • the only other component of the new pavement is the asphalt cement carried by the cold recycler machine and/or by a mobile supply vehicle.
  • the rate of advance of the equipment engaged in the CIR process is determined primarily by the rate of advance of the milling machine, it is common for all of the components of the CIR process except for the asphalt paving machine to be coupled together so as to move at the same rate during all phases of the CIR process.
  • Such components employed in carrying out a CIR process are frequently referred to as a CIR train.
  • Asphalt cement performs best in the CIR process when it is applied at a temperature within the range of about 149° to about 177°C (300° to about 350° F).
  • the asphalt cement supply truck is typically thermally insulated, it does not include any heating mechanism for maintaining the temperature of the asphalt cement as the CIR process is carried out. Consequently, the asphalt cement in the supply truck will begin to lose heat as soon as the truck leaves the asphalt cement supply terminal. If the CIR process is being carried out at a great distance from the asphalt cement supply terminal, the asphalt cement in the supply truck will have lost a significant part of its heat even before the CIR process is begun. Furthermore, the CIR process may begin at a time of day such that it cannot be completed during a single operating shift. When the temperature of the asphalt cement in the supply truck falls below about 149°C (300°F)., for whatever reason, its continued use will likely result in a repaired roadway of substandard quality.
  • Co-pending U.S. Patent Application No. 15/855,403 describes a method and apparatus for heating asphalt cement that is carried in an asphalt cement supply tank prior to the use of such asphalt cement in a CIR process.
  • the apparatus described in this application comprises a heater for asphalt cement that is a part of a CIR train. More particularly, the heater is interposed between the asphalt cement supply tank and the component of the CIR train that is dispensing asphalt cement to be mixed with recycled paving material in the CIR process.
  • a heater with an infinitely variable heating output between about 316,517kJ (300,000 BTUs) per hour and about 527,528-791,292kJ (500,000-750,000 BTUs) per hour is employed in the method of this co-pending patent application; however, infinitely variable heaters with heating outputs in this range are difficult to find. Consequently, it would be desirable if an apparatus could be provided that would allow for heating asphalt cement by the required amount using a much simpler heating apparatus.
  • WO2018/128888 A1 which is citable under Art.54(3) EPC, discloses a CIR train that is adapted to traverse a roadway of asphalt pavement in order to recycle and repair the asphalt pavement and includes a milling machine for removing asphalt paving material from the roadway.
  • the CIR train also includes an asphalt cement supply tank and a mechanism for dispensing asphalt cement onto asphalt paving material that has been removed from the roadway.
  • a heater is in fluid communication with the asphalt cement supply tank and the mechanism for dispensing asphalt cement on the asphalt paving material that has been removed from the roadway. The heater is adapted to heat the asphalt cement from the asphalt cement supply tank prior to said asphalt cement being dispensed on the asphalt paving material that has been removed from the roadway.
  • US 5219450A discloses a movable asphalt mixing plant which is towed behind a milling machine.
  • the mixing plant includes an input conveyor which receives the crushed aggregate from the milling machine.
  • the aggregate is then introduced into a pug mill carried by the mobile plant.
  • a heated storage tank and appropriate pumps and conduits for asphaltic cement located on the mobile plant allow the asphaltic cement to be mixed with the aggregate in the pug mill.
  • the amount of asphaltic cement added to the aggregate may be controlled by a microprocessor which receives input regarding the production rate and input weight of aggregate.
  • Asphaltic paving material produced by the pug mill is dispensed from the rear of the plant.
  • a heating system employing hot circulating oil is also provided to ensure that the pumps and conduits for the asphalt cement flow freely.
  • a preferred embodiment of the invention provides an apparatus that allows the CIR process to continue without concern for the loss of heat in the asphalt cement carried by the supply truck.
  • Yet another advantage of a preferred embodiment of the invention is that it provides an apparatus that employs a simpler heating apparatus than one providing an infinitely variable heating output between its maximum and minimum rated Btu values.
  • CIR cold in-place recycling
  • attachments, coupling and the like such as “attached”, “coupled”, “connected” and “interconnected”, refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures, as well as both moveable and rigid attachments or relationships, unless otherwise specified herein or clearly indicated as having a different relationship by context.
  • operatively connected and operatively attached describe such an attachment, coupling or connection that allows the pertinent structures to operate as intended by virtue of that relationship.
  • fluid communication refers to such an attachment, coupling or connection that allows for flow of fluid from one such structure or component to or by means of the other.
  • asphalt cement includes asphalt cement of various types and formulations in liquid form, as well as foamed asphalt cement and asphalt cement emulsions which are capable of fluid flow.
  • milling machine refers to a machine having a milling or working drum that is adapted to be placed into contact with a roadway or road base surface for removing a portion of the surface.
  • milling machine includes but is not limited to machines that are sometimes referred to as road stabilizers and roadway reclaiming machines.
  • milling machine also includes a CIR-modified milling machine, as hereinafter defined.
  • CIR process refers to a use of cold in-place recycling (“CIR”) equipment to repair damage to a roadway, by removing damaged layers of pavement, processing the paving material so removed, replacing the removed and processed paving material onto the roadway, and compacting it.
  • CIR cold in-place recycling
  • CIR-modified milling machine refers to a milling machine which has been modified by the addition of an asphalt cement flow system including a spray assembly that is mounted in the milling drum housing to dispense asphalt cement into the milling drum housing.
  • CIR train refers to a plurality of items of equipment including, but not limited to, a mobile asphalt cement supply tank and a milling machine (which may or may not be a CIR-modified milling machine), which items of equipment are used, or intended to be used, in a CIR process.
  • a CIR train may include a cold recycler machine, and it will also include an asphalt paving machine, although the asphalt paving machine may be employed at a time subsequent to the passage of the other components of the CIR train to pick up a windrow of processed paving material from the roadway.
  • processing direction refers to the primary direction of travel of a CIR train as it operates on a roadway.
  • downstream refers to a relative position in the direction of the flow of asphalt cement from the supply tank to the component of a CIR train that is dispensing asphalt cement to be mixed with recycled paving material in a CIR process according to the invention.
  • upstream refers to a relative position in a direction that is opposite to the direction of the flow of asphalt cement from the supply tank to the component of a CIR train that is dispensing asphalt cement to be mixed with recycled paving material in a CIR process according to the invention.
  • the invention comprises a method and apparatus for heating asphalt cement that is discharged from a mobile asphalt cement supply tank in order to facilitate the use of such asphalt cement in a CIR process.
  • a heating assembly for asphalt cement comprises a heater and a heat modifying component. This heating assembly is interposed in the asphalt cement flow circuit between the asphalt cement supply tank and the component of the CIR train that is dispensing asphalt cement to be mixed with recycled paving material in the CIR process. More particularly, the heating assembly is located downstream of the asphalt cement supply tank and upstream of the component for dispensing asphalt cement to be mixed with recycled paving material.
  • the heater component of the heating assembly comprises a burner and an asphalt cement coil. Asphalt cement to be heated is pumped through the asphalt cement coil, and the burner directs hot gases of combustion across the asphalt cement coil so that heat may be transferred from the hot gases to the asphalt cement flowing through the coil.
  • the heater may include multiple asphalt cement coils across which hot gases of combustion are directed.
  • the heater may be provided with multiple burner nozzles, each of a different size, so that fuel can be selectively directed through nozzles of different sizes to change the heat output from the burner.
  • the heater may also be provided with valves or other mechanisms that can change the fuel flow rate to the burner to change the heat output.
  • the heat modifying component of the heating assembly is adapted to modulate the amount of heat transfer from the hot gases of combustion to the asphalt cement in the asphalt cement coil in order to control the temperature of the asphalt cement in the asphalt cement flow circuit downstream of the heating assembly. This modulation is preferably carried out by modifying the air flow and/or the asphalt cement flow through the heater.
  • the heat modifying component comprises a by-pass valve that is arranged to blend unheated asphalt cement with asphalt cement that is heated by the heater in such a manner so as to obtain the desired asphalt cement temperature in the blend.
  • the heat modifying component comprises an air flow regulator assembly that controls the flow of the hot gases of combustion generated by the burner across the asphalt cement coil, in order to control the amount of heat transfer from the hot gases to the asphalt cement in the coil.
  • multiple exhaust vents are mounted to the heater, each of which is provided with a damper or other control mechanism that selectively allows or blocks the flow of hot gases of combustion across the asphalt cement coil of the heater.
  • the exhaust vents and dampers are so located that operation of the dampers can change the path of hot gases of combustion within the heater, thereby changing the flow pattern of hot gases of combustion across the asphalt cement coil, and thereby changing the amount of heat transferred by the hot gases of combustion to the asphalt cement within the coil.
  • the heating assembly is adapted to heat asphalt cement continuously as it is withdrawn from the asphalt cement supply tank, so as to continuously increase the temperature of the asphalt cement at a rate of about 0.55C (1.0° F). per 3.8 litres (gallon) at a flow rate of about 113.5 litres/minute (30 gallons/minute), or at a greater rate of temperature increase at a lower flow rate, or at a lesser rate of temperature increase at a higher flow rate, in order to insure that the asphalt cement that is discharged from the heating assembly is within a predetermined acceptable range of temperatures for use in the CIR process.
  • FIGs 1 , 2 and 2A illustrate a first CIR train comprised of asphalt paving machine 10 (not shown in Figures 2 and 2A ), CIR-modified milling machine 12, heater 14 and asphalt cement supply truck 16.
  • CIR-modified milling machine 12 includes operator's station 18 and an engine, typically a diesel engine (not shown) that is enclosed in engine compartment 20. Power from the engine is transmitted by a drive belt (not shown) or other means known to those having ordinary skill in the art to which the invention relates, to milling drum 22, which is located in a conventional milling drum housing 24 (not shown in Figures 2 and 2A for clarity).
  • Milling drum 22 includes a plurality of cutter teeth that are adapted to mill the road surface as the milling drum rotates and the machine is advanced along the roadway in the processing direction "P".
  • a CIR-modified milling machine may include one or two rear drive track assemblies (such as rear track drive assembly 26), and two front drive track assemblies (such as front track drive assembly 28). Some or all of these track drive assemblies can be turned to the left and to the right for steering purposes.
  • Other embodiments of CIR-modified milling machines may include wheel drive assemblies instead of track drive assemblies.
  • the drive assemblies are attached to lifting columns that include internal linear actuators (not shown) which can be activated to raise and lower the frame of the machine with respect to the roadway surface to change the depth of milling being carried out.
  • milling drum 22 is mounted for rotation in milling drum housing 24 on the frame of the machine, raising the frame on the lifting columns can raise the milling drum out of contact with the roadway surface, and lowering the frame on the lifting columns can lower the milling drum into contact with the road surface so as to make a cut of the desired depth.
  • Operator's station 18 includes all of the controls necessary for driving and steering the CIR-modified milling machine, rotating milling drum 22, and controlling all other operations of milling machine 12.
  • CIR-modified milling machine 12 includes asphalt cement spray assembly 30 that is mounted within the milling drum housing and adapted to dispense asphalt cement obtained from input supply line 32 which is in fluid communication with supply tank 34 on asphalt cement supply truck 16.
  • Asphalt cement metering flow mechanism 36 is mounted on the front end of milling machine 12 and is in fluid communication with output supply line 38, heating assembly 14 and input supply line 32 from supply truck 16.
  • Flow mechanism 36 comprises a pump that operates to draw asphalt cement from supply tank 34 of supply truck 16, through input supply line 32 into heater 14, and out of heater 14 through output supply line 38 to spray assembly 30, which dispenses asphalt cement into milling drum housing 24, where it mixes with paving material milled from the roadway.
  • FIG. 2A An alternative asphalt cement flow circuit from asphalt cement supply tank truck 16 to milling drum housing 24 of the CIR-modified milling machine is illustrated in Figure 2A .
  • flow mechanism or pump 36 operates to draw asphalt cement from supply tank 34 of supply truck 16, through input supply line 32a to pump 36, from pump 36 to heater 14 by heater input line 33, and from heater 14 to spray assembly 30 through output supply line 38.
  • the mixture of asphalt cement and milled material is then conveyed from milling drum housing 24 by conveyor 40 into hopper 42 at the front end of asphalt paving machine 10.
  • Paving machine 10 includes a conventional conveyor system comprising longitudinally disposed conveyors (not shown) and a transversely disposed screw auger (also not shown) for delivering the mixture of asphalt cement and recycled paving material from hopper 42 to a position just in advance of floating screed 44 where it is discharged onto the surface to be paved.
  • the screed compacts and levels the asphalt mat on the repaired roadway.
  • FIG. 3 illustrates a second embodiment of a CIR train that is adapted to traverse the roadway in the processing direction "P" as it recycles the pavement on the roadway.
  • This CIR train is comprised of conventional asphalt paving machine 10, cold recycler machine 46, milling machine 48, heater 14 and asphalt cement supply truck 16.
  • Cold recycler machine 46 includes asphalt cement storage tank 50, crusher 52, screen assembly 54 and pugmill 56.
  • Milling machine 48 is a conventional milling machine.
  • a pump (not shown) connected to asphalt cement storage tank 50 operates to draw asphalt cement from supply tank 34 of supply truck 16, through input supply line 32 into heater 14, and out of heater 14 through output supply line 58 to asphalt cement storage tank 50 on cold recycler machine 46.
  • Milling machine 48 mills paving material from the roadway and conveys it via conveyor 60 into input hopper 62 on cold recycler machine 46.
  • the material milled by the milling machine is then processed by cold recycler machine 46 by means of crusher 52 and screen assembly 54, and is conveyed into pugmill 56.
  • Asphalt cement from asphalt cement storage tank 50 is also conveyed to and dispensed into pugmill 56 and mixed therein with the processed milled material.
  • the mixture of asphalt cement and recycled paving material is then conveyed from the pugmill by conveyor 64 into hopper 42 at the front end of asphalt paving machine 10.
  • the internal conveyor system in conventional paving machine 10 delivers the mixture of asphalt cement and recycled paving material from hopper 42 to a position just in advance of floating screed 44 where it is discharged onto the surface to be paved. Screed 44 compacts and levels the asphalt mat on the repaired roadway.
  • Figures 4-8 illustrate a first embodiment of a heating assembly including a heater and a heat modifying component that is arranged to modify the flow of asphalt cement through the asphalt cement coil of the heater in order to control the amount of heat transfer from hot gases generated in the heater to the asphalt cement in the coil.
  • Figure 4 is a schematic view of a portion of an alternative CIR train which includes asphalt cement supply tank 134 and an asphalt cement flow circuit comprising supply tank control valve 136 for controlling the flow of asphalt cement from supply tank 134, supply line 138, screen strainer 140 for removing impurities from the asphalt cement, asphalt cement pump 142, asphalt cement flow meter 144 for measuring the asphalt cement passing out of the asphalt cement pump, and input line 145 to heating assembly 146.
  • Heat modifying component 148 includes by-pass valve 149, by-pass input line 150 to by-pass valve 149, mixing tee 152, by-pass outlet line 154 to mixing tee 152, heater outlet line 156 to mixing tee 152 and output supply line 158 from mixing tee 152.
  • by-pass input line 150 to by-pass valve 149, mixing tee 152, by-pass outlet line 154 to mixing tee 152, and heater outlet line 156 to mixing tee 152 comprise by-pass fluid circuitry that is a part of the asphalt cement flow circuit.
  • the asphalt cement flow circuit illustrated in Figure 4 provides fluid communication between and among supply tank 134 for asphalt cement, heating assembly 146 which is located downstream of supply tank 134, and a mechanism for dispensing asphalt cement on recycled paving material removed from a roadway by a milling machine in a CIR process.
  • the heating assembly is adapted to heat the asphalt cement coming from the supply tank prior to its being dispensed on the recycled paving material that has been removed from the roadway.
  • Heating assembly 146 may be a stand-alone unit located behind the asphalt cement supply truck, or it may be mounted to the asphalt cement supply truck, to a CIR-modified milling machine or to a cold recycler machine.
  • Heater 114 of heating assembly 146 is illustrated in some detail in Figure 5 .
  • heater 114 includes burner 159 which is adapted to burn diesel fuel, propane or another fuel with air drawn from outside the heating assembly by an internal fan or blower (not shown) to create flame 160 and hot gases of combustion.
  • the flame and hot gases of combustion are directed into a heating area of coil chamber 161 that is defined in part by asphalt cement coil 162.
  • the asphalt cement coil is wrapped around the inside of coil chamber 161 in a helical pattern throughout its length.
  • outer insulation layer 163 Surrounding the interior coil heating chamber 161 is outer insulation layer 163 which provides thermal insulation for heater 114.
  • Asphalt cement coil 162 is part of the asphalt cement flow circuit illustrated in Figure 4 , and thus, is in fluid communication with asphalt cement inlet line 147 and asphalt cement heater outlet line 156.
  • Burner 159 is arranged with respect to asphalt cement coil 162 so that the hot gases of combustion produced by the burner can pass through and around asphalt cement coil 162 in coil chamber 161 in order to transfer heat to the asphalt cement being pumped through asphalt cement coil 162 by pump 142.
  • Exhaust gases from interior heating chamber 161 are vented out of heater 114 through exhaust vent 164, which is in fluid communication with the interior heating chamber.
  • FIGs 4 and 6-8 illustrate heat modifying component 148 for heating assembly 146, and a preferred asphalt cement flow circuit that is associated therewith.
  • asphalt cement from supply tank 134 is pumped by asphalt cement pump 142 past asphalt cement flow meter 144 into input line 145 of heating assembly 146.
  • By-pass valve 149 includes valve disk 167 (shown in Figures 7 and 8 ) that is attached to linear actuator 168 and adapted to move between one or more open positions, including the open position shown in Figure 7 , and a closed position shown in Figure 8 .
  • the by-pass valve is also in an open position in Figure 6 .
  • Heat modifying component 148 also includes linear position sensor 169 (shown in Figures 7 and 8 ) that is adapted to determine the location of valve disk 167 with respect to valve seat 170 at any time.
  • linear position sensor 169 shown in Figures 7 and 8
  • a portion of the asphalt cement entering heating assembly 146 through input line 145 passes through by-pass input line 150 and into by-pass valve 149, and from by-pass valve 149 into mixing tee 152 as shown by asphalt cement flow line AC 171 . This portion of the asphalt cement by-passes the heater.
  • Another portion of the asphalt cement entering through input line 145 passes through heater inlet line 147, as shown by asphalt cement flow line AC 172 , to heater 114, and from heater 114 through heater outlet line 156 into mixing tee 152.
  • heater inlet line 147 As shown by asphalt cement flow line AC 172 , to heater 114, and from heater 114 through heater outlet line 156 into mixing tee 152.
  • controller 174 a greater or lesser portion of the asphalt cement entering through input line 145 will be directed to heater 114, so that the relative proportion of heated asphalt cement passing out of mixing tee 152 can be modulated to obtain the desired asphalt cement temperature downstream of the heating assembly.
  • Both linear actuator 168 and linear position sensor 169 are operatively attached to controller 174, shown schematically in Figures 4 and 6-8 , which is preferably mounted in the operator's station of a CIR-modified milling machine such as CIR-modified milling machine 12 or a cold recycler machine such as cold recycler machine 46.
  • Controller 174 is also operatively connected to asphalt cement pump 142, asphalt cement flow meter 144 and asphalt cement heater 114.
  • Controller 174 is also operatively connected to temperature sensor 175, located in input line 145 into heating assembly 146, and to temperature sensor 176, located in heater outlet line 156.
  • the controller is adapted to receive temperature information from these temperature sensors in order to control the temperature of asphalt cement passing through output supply line 158 to a modified milling machine such as modified milling machine 12 or to a cold recycler machine such as cold recycler machine 46.
  • Controller 174 may embody a single microprocessor or multiple microprocessors that include components for controlling the temperature of the asphalt cement used in the CIR process, as well as components for controlling the operations of modified milling machine 12 or cold recycler machine 46, based on input from a machine operator and on sensed or other known operational parameters. Controller 174 may include a memory, a secondary storage device, a processor and other components for running an application. Various other circuits may be associated with controller 174 such as power supply circuitry, signal conditioning circuitry, solenoid driver circuitry and other types of circuitry. Numerous commercially available microprocessors can be configured to perform the functions of controller 174. It should be appreciated that controller 174 could readily be embodied in a general purpose computer or machine microprocessor capable of controlling numerous machine functions for a modified milling machine such as modified milling machine 12 or a cold recycler machine such as cold recycler machine 46.
  • FIGS 9 and 10 illustrate a second embodiment of a heating assembly of the invention, comprising heating assembly 115, which includes dual heater 116 and heat modifying component 117.
  • Dual heater 116 comprises a pair of heaters 118 and 119 that are joined together in series, each of which is substantially identical to heater 114 shown in Figure 5 .
  • Dual heater 116 can be substituted for heater 114 in the schematic view of heating assembly 146 shown in Figure 4 .
  • Heat modifying component 117 includes by-pass valve 149 and associated components of the asphalt cement flow circuit that are associated therewith.
  • the asphalt cement that is heated in heater 118 passes out of heater 118 through cross-over line 122 as shown by flow line AC 123 in Figure 10 , and into heater 119.
  • Cross-over line 122 is in fluid communication with an asphalt cement coil in heater 119 (not shown), so that the asphalt cement in the asphalt cement coil may be heated by contact with hot gases of combustion generated by burner 124.
  • the asphalt cement from heater 119 passes out of heater 119 through heater outlet line 156 as shown by flow line AC 125 , and into mixing tee 152 (not shown in Figures 9 and 10 ).
  • heating assembly 115 may be mounted on frame 126 of a milling machine such as modified milling machine 12.
  • asphalt cement passes out of mixing tee 152 through an output supply line such as output supply line 158 (not shown in Figures 9 and 10 ) as shown by flow line AC 127 , to a spray assembly such as spray assembly 30, which dispenses the asphalt cement into a milling drum housing where it mixes with paving material milled from the roadway.
  • an output supply line such as output supply line 158 (not shown in Figures 9 and 10 ) as shown by flow line AC 127 , to a spray assembly such as spray assembly 30, which dispenses the asphalt cement into a milling drum housing where it mixes with paving material milled from the roadway.
  • Figures 11-16 illustrate a third embodiment of a heating assembly including a heater and a heat modifying component that is arranged to modify the flow of hot gases of combustion from the burner of the heater across the asphalt cement coil in order to control the amount of heat transfer from the hot gases generated by the burner to the asphalt cement in the coil.
  • Figure 11 provides a schematic view of a portion of an alternative CIR train which includes asphalt cement supply tank 134 and an asphalt cement flow circuit comprising supply tank control valve 136 for controlling the flow of asphalt cement from supply tank 134, supply line 138, screen strainer 140 for removing impurities from the asphalt cement, asphalt cement pump 142, asphalt cement flow meter 144 for measuring the asphalt cement passing out of the asphalt cement pump, and input line 145 to heating assembly 246.
  • heating assembly 246 includes heater 214 which is equipped with burner 177.
  • Burner 177 is operatively connected to controller 174 and is adapted to burn diesel fuel, propane or another fuel with air drawn from outside the burner assembly by an internal fan or blower (not shown) to create flame 178 (shown in Figures 13 and 15 ) and hot gases of combustion that are directed into coil chamber 180 that is defined in part by outer wall 182.
  • Asphalt cement coil 184 is part of the asphalt cement flow circuit and is in fluid communication with asphalt cement inlet 186 and asphalt cement outlet 188, so that the hot gases of combustion produced by burner 177 can pass through and around asphalt cement coil 184 in coil chamber 180 in order to transfer heat to the asphalt cement being pumped through asphalt cement coil 184 by pump 142, as controlled by controller 174.
  • Heating assembly 246 includes a heat modifying component comprising an air flow regulator assembly that is operatively attached to heater 214. More specifically, the air flow regulator assembly comprises upper exhaust vent 190 with upper damper 192 mounted therein, and lower exhaust vent 194 with a lower damper (not shown, but substantially identical to upper damper 192) mounted therein. Both upper exhaust vent 190 and lower exhaust vent 194 are mounted so as to be in fluid communication with coil chamber 180.
  • both upper damper 192 and the lower damper are controlled by linear actuator 196 that is operatively attached to controller 174, so that either upper damper 192 is open and the lower damper is closed (as shown in Figures 13 and 14 ), allowing the hot gases of combustion to flow downwardly through and upwardly along the sides of asphalt cement coil 184 before exiting coil chamber 180, or the lower damper is open and upper damper 192 is closed (as shown in Figures 15 and 16 ), allowing the hot gases of combustion to flow downwardly through the asphalt cement coil and then out of coil chamber 180.
  • Heating assembly 246 also includes a linear position sensor (not shown, but similar to linear position sensor 169 that is shown in Figures 7 and 8 ) that is associated with linear actuator 196 and is adapted to determine the amount of extension of linear actuator 196, and hence whether upper damper 192 and the lower damper are open or closed.
  • a heating assembly similar to heating assembly 246 may include a dual heater such as dual heater 116, comprising heaters 118 and 119, either or both of which are provided with an air flow regulator assembly such as is illustrated in Figures 12-16 .
  • Burners 159, 121, 124 and 177 are preferably multi-stage burners that may be configured in any of various ways.
  • the SDC Series oil burner sold by the Beckett Corporation of North Ridgeville, Ohio has a single fuel nozzle that operates according to two different pressure ranges to produce two different heat outputs
  • the RG5D light oil burner sold by Riello S.p.A. of Legnago, Italy has two fuel nozzles that operate according to different flow rates to produce two different heat outputs.
  • the WL20 oil burner sold by Weishaupt Corporation of Mississauga, Ontario has two solenoids that operate to supply two different flow rates to a single nozzle to produce two different heat outputs.
  • Other burner assemblies may be employed that are adapted to produce one or more than one heat output.
  • a burner is employed that is adapted to produce a maximum of at least about 422,022 kJ (400,000 BTUs) per hour.
  • the operator may select a desired temperature of asphalt cement passing out of heating assembly 246 by way of asphalt cement outlet 188 through output supply line 158 to a modified milling machine such as modified milling machine 12 or to a cold recycler machine such as cold recycler machine 46.
  • controller 174 When this desired temperature is input into controller 174, the controller will use this information and: (1) the input asphalt cement temperature obtained from sensor 175 located in input line 145 to asphalt cement inlet 186 of heating assembly 246, (2) the output asphalt cement temperature obtained from sensor 198 located in asphalt cement outlet 188 of heater 214, (3) input from the linear position sensor associated with linear actuator 196 of heating assembly 246, and (4) the flow rate of pump 142 (obtained from asphalt cement flow meter 144) to control: (a) asphalt cement pump 142, (b) burner 177, and (c) linear actuator 196 (which controls both upper damper 192 and the lower damper associated with heater 214) to produce the desired output temperature of asphalt cement passing through asphalt cement output 188 to an output supply line to a modified milling machine such as modified milling machine 12 or to a cold recycler machine such as cold recycler machine 46.
  • a modified milling machine such as modified milling machine 12
  • a cold recycler machine such as cold recycler machine 46.
  • heating assembly 246 is adapted to heat asphalt cement continuously as it is withdrawn from the asphalt cement supply tank, so as to continuously increase the temperature of the asphalt cement at a rate of about 0.55°C (1.0° F). per 3.8 litres (gallon) at a flow rate of about 113.5 litres/minute (30 gallons/minute), or at a greater rate of temperature increase at a lower flow rate, or at a lesser rate of temperature increase at a higher flow rate, in order to insure that the asphalt cement that is discharged from the heater is within a predetermined acceptable range of temperatures for use in the CIR process.
  • Heating assembly 246 is located downstream of supply tank 134 in an asphalt cement flow circuit that is in fluid communication with a mechanism for dispensing asphalt cement on recycled paving material removed from a roadway by a milling machine in a CIR process.
  • the heating assembly is adapted to heat the asphalt cement coming from the supply tank prior to its being dispensed on the recycled paving material that has been removed from the roadway.
  • Heating assembly 246 may be a stand-alone unit located behind the asphalt cement supply truck, or it may be mounted to the asphalt cement supply truck, to a CIR-modified milling machine or to a cold recycler machine.

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Claims (11)

  1. Zug zum Cold-In-Place-Recyceln (CIR), der auf einer Straßendecke einer Straße fährt, um Straßendeckenmaterial von der Straßendecke zu entfernen und das Straßendeckenmaterial durch Mischen mit Asphaltzement zu recyceln, wobei der CIR-Zug umfasst:
    A) eine Fräsmaschine (12, 48) zum Fräsen der Straßendecke und Entfernen des gefrästen Straßendeckenmaterials von der Straße;
    B) einen Asphaltzement-Vorratstank (34; 134), der von der Fräsmaschine getrennt ist;
    C) einen Mechanismus (30, 50) zum Abgeben von Asphaltzement an das Straßendeckenmaterial, das durch die Fräsmaschine von der Straße entfernt wurde;
    D) einen Asphaltzement-Strömungskreislauf (136, 138), der für die Strömung von Asphaltzement von dem Asphaltzement-Vorratstank (34) an den Mechanismus (30, 50) sorgt, um Asphaltzement an das von der Straße entfernt Straßendeckenmaterial abzugeben, wobei der Asphaltzement-Strömungskreislauf (136, 138) eine Asphaltzementpumpe (142) zum Pumpen von Asphaltzement von dem Asphaltzement-Vorratstank (34) in und durch den Asphaltzement-Strömungskreislauf (136, 138) aufweist;
    E) eine Heizanordnung (146; 115; 246), die in den Asphaltzement-Strömungskreislauf (136, 138) zwischen dem Asphaltzement-Vorratstank (34) und dem Mechanismus (30, 50) zum Abgeben von Asphaltzement an das von der Straße entfernte Straßendeckenmaterial eingebaut ist, wobei die Heizanordnung (146; 115; 246) umfasst:
    i) eine Heizeinrichtung (114; 116; 214),
    dadurch gekennzeichnet, dass die Heizeinrichtung (114; 116; 214) umfasst:
    a) eine Asphaltzementschlange (162; 184), die in dem Asphaltzement-Strömungskreislauf (136, 138) ist, und
    b) einen Brenner (159; 121; 124; 177), der heiße Verbrennungsgase über die Asphaltzementschlange (162; 184) richtet, durch welche Asphaltzement gepumpt wird;
    und dass die Heizanordnung ferner umfasst:
    ii) eine Wärmemodifikationskomponente (148; 117; 190, 192, 194), die das Ausmaß von Wärmeübertragung von den heißen Verbrennungsgasen auf den Asphaltzement in der Asphaltzementschlange (162; 184) moduliert, um die Temperatur des Asphaltzements in dem Asphaltzement-Strömungskreislauf (136, 138) stromabwärts von der Heizanordnung (146; 115; 246) zu steuern durch Modifizieren der Strömung von Asphaltzement durch die Asphaltzementschlange (162; 184) und/oder durch Modifizieren der Strömung von heißen Verbrennungsgasen von dem Brenner (159; 121; 124; 177) der Heizeinrichtung (114; 116; 214) über die Asphaltzementschlange (162; 184).
  2. CIR-Zug gemäß Anspruch 1, wobei der Asphaltzement-Vorratstank (34; 134) auf einem Asphaltzement-Liefer-LKW (16) montiert ist.
  3. CIR-Zug gemäß Anspruch 1 oder 2, wobei die Heizeinrichtung (114; 116; 214) eine Durchlauferhitzung des von dem Asphaltzement-Vorratstank (34; 134) kommenden Asphaltzements vorsieht.
  4. CIR-Zug gemäß Anspruch 1, 2 oder 3, wobei die Heizeinrichtung (116) ein Paar Asphaltzementschlangen (162) umfasst, die in dem Asphaltzement-Strömungskreislauf (136, 138) in Reihe geschaltet sind.
  5. CIR-Zug gemäß einem der vorhergehenden Ansprüche, wobei der Asphaltzement-Strömungskreislauf (136, 138) eine in die Heizanordnung (146; 115; 246) führende Eingangsleitung (145) für Asphaltzement und eine aus der Heizanordnung (146; 115; 246) heraus führende Ausgangsleitung (158; 188) für Asphaltzement umfasst.
  6. CIR-Zug gemäß Anspruch 5,
    A) der ein Misch-T-Stück (152) aufweist, das zwischen der Heizeinrichtung (114; 116) und der aus der Heizanordnung (146; 115) heraus führenden Ausgangsleitung (158; 188) für Asphaltzement angeordnet ist;
    B) wobei die Wärmemodifizierungskomponente (148; 117) einen Bypass-Fluidkreislauf (150, 154) und ein Bypass-Ventil (149) aufweist, das sich bewegt zwischen:
    i) einer oder mehreren offenen Positionen, in denen mindestens ein Teil des durch die Eingangsleitung (145) in die Heizanordnung (146; 115) gelangenden Asphaltzements in das Misch-T-Stück (152) geleitet wird, ohne durch die Heizeinrichtung (114; 116) zu gelangen; und
    ii) einer geschlossenen Position, in der der gesamte durch die Eingangsleitung (145) in die Heizanordnung (146; 115) gelangende Asphaltzement in der Heizeinrichtung (114; 116) erhitzt und dann in das Misch-T-Stück (152) geleitet wird.
  7. CIR-Zug gemäß Anspruch 6,
    A) wobei die Wärmemodifizierungskomponente (148; 117) ein Linearstellglied (168) aufweist;
    B) wobei das Bypass-Ventil (149) einen Ventilteller (167) und einen Ventilsitz (170) aufweist, wobei der Ventilteller (167) an dem Linearstellglied (168) befestigt ist und sich zwischen einer oder mehreren offenen Positionen bezüglich des Ventilsitzes (170) und einer geschlossenen Position auf dem Ventilsitz (170) bewegt; und
    C) wobei die Wärmemodifizierungskomponente (148; 117) einen Linearpositionssensor (169) aufweist, der den Ort des Ventiltellers (167) bezüglich des Ventilsitzes (170) bestimmt.
  8. CIR-Zug gemäß Anspruch 7,
    A) der einen Controller (174) aufweist;
    B) der eine von der Heizeinrichtung (114; 116) zu dem Misch-T-Stück (152) führende Ausgangsleitung (156) für Asphaltzement aufweist;
    C) der einen Temperatursensor (175) aufweist, der in der in die Heizanordnung (146) führenden Eingangsleitung (145) für Asphaltzement angeordnet ist;
    D) der einen Temperatursensor (176) aufweist, der in der von der Heizeinrichtung (114; 116) zum Misch-T-Stück (152) führenden Ausgangsleitung (156) angeordnet ist;
    E) wobei der Controller (174) mit dem Temperatursensor (175), der in der Eingangsleitung (145) angeordnet ist, dem Temperatursensor (176), der in der Ausgangsleitung (156) angeordnet ist, dem Linearstellglied (168), dem Linearpositionssensor (169), dem Bypass-Ventil (149), der Asphaltzementpumpe (142), einem Asphaltströmungsmesser (144) zum Messen des aus der Asphaltzementpumpe (142) heraus gelangenden Asphaltzements und der Heizeinrichtung (114; 116) wirksam verbunden ist;
    F) wobei der Controller (174) Temperaturinformationen von den Temperatursensoren (175, 176), die in der in die Heizanordnung führenden Eingangsleitung (145) für Asphaltzement und in der aus der Heizeinrichtung (114; 116) zum Misch-T-Stück (152) führenden Ausgangsleitung angeordnet sind, empfängt und diese Informationen dazu verwendet, die Strömung von Asphaltzement von der Pumpe (142) und den Betrieb der Heizeinrichtung (114; 116) und des Bypass-Ventils (149) zu steuern, um eine gewünschte Temperatur von Asphaltzement zu erhalten, der durch die aus der Heizanordnung (146; 115) heraus führenden Ausgangsleitung (158; 188) für Asphaltzement gelangt.
  9. CIR-Zug gemäß einem der vorhergehenden Ansprüche 2, 3 oder 4,
    A) wobei die Wärmemodifizierungskomponente (148; 117; 190, 192, 194) die Strömung heißer Verbrennungsgase von dem Brenner (159; 121; 124; 177) der Heizeinrichtung (114; 116; 214) über die Asphaltzementschlange (162; 184) modifiziert,
    B) wobei die Heizeinrichtung (214) eine Schlangenkammer (180) aufweist, die zum Teil durch eine Außenwand (182) definiert ist, wobei die Schlangenkammer (180) die Asphaltzementschlange (184) enthält;
    C) wobei der Brenner (177) die heißen Verbrennungsgase in die Schlangenkammer (180) und über die darin befindliche Asphaltzementschlange (184) richtet;
    D) wobei die Wärmemodifizierungskomponente (190, 192, 194) eine Luftstromregulierungsanordnung umfasst, die ein Linearstellglied (196), einen oberen Abgasauslass (190) mit einem darin angebrachten oberen Dämpfer (192) und einen unteren Abgasauslass (194) mit einem darin angebrachten unteren Dämpfer umfasst, wobei der obere Abgasauslass (190) und der untere Abgasauslass (194):
    i) so angebracht sind, dass sie mit der Schlangenkammer (180) in Fluidkommunikation sind;
    ii) von dem Linearstellglied (196) so gesteuert werden, dass entweder der obere Dämpfer (192) offen ist und der untere Dämpfer geschlossen ist, wodurch es den heißen Verbrennungsgasen erlaubt wird, nach unten durch die und nach oben entlang den Seiten der Asphaltzementschlange (184) zu strömen, bevor sie die Schlangenkammer (180) verlassen, oder der untere Dämpfer offen ist und der obere Dämpfer (192) geschlossen ist, wodurch es den heißen Verbrennungsgasen erlaubt wird, nach unten durch die Asphaltzementschlange (184) und dann aus der Schlangenkammer (180) heraus zu strömen.
  10. CIR-Zug gemäß Anspruch 9,
    wobei die Luftstromregulierungsanordnung einen Linearpositionssensor umfasst, der dem Linearstellglied (196) zugeordnet ist und das Ausmaß des Ausfahrens des Linearstellglieds (196) und daher, ob der obere Dämpfer (192) und der untere Dämpfer offen oder geschlossen sind, bestimmt.
  11. CIR-Zug gemäß Anspruch 10,
    A) der einen Controller (174) aufweist;
    B) der einen Temperatursensor (175) aufweist, der in einer in die Heizanordnung (246) führenden Eingangsleitung (145) für Asphaltzement angeordnet ist;
    C) der einen Temperatursensor (198) aufweist, der in einer aus der Heizanordnung (246) heraus führenden Ausgangsleitung (188) für Asphaltzement angeordnet ist;
    D) wobei der Controller (174) mit dem Temperatursensor (175), der in der in die Heizanordnung (246) führenden Eingangsleitung (145) für Asphaltzement angeordnet ist, dem Temperatursensor (198), der in der aus der Heizanordnung (246) heraus führenden Ausgangsleitung (188) für Asphaltzement angeordnet ist, dem Linearstellglied (196), dem Linearpositionssensor, der Asphaltzementpumpe (142), einem Asphaltströmungsmesser (144) zum Messen des aus der Asphaltzementpumpe (142) gelangenden Asphaltzements und der Heizeinrichtung (214) wirksam verbunden ist;
    E) wobei der Controller (174) Temperaturinformationen von den Temperatursensoren (175, 198), die in der in die Heizanordnung (246) führenden Eingangsleitung (145) für Asphaltzement und in der aus der Heizanordnung (246) heraus führenden Ausgangsleitung (188) für Asphaltzement angeordnet sind, empfängt und diese Informationen dazu verwendet, die Strömung von Asphaltzement von der Pumpe (142) und den Betrieb der Heizeinrichtung (214) und des Linearstellglieds (196) der Luftstromregulierungsanordnung zu steuern, um eine gewünschte Temperatur von Asphaltzement zu erhalten, der durch die aus der Heizanordnung (246) heraus führenden Ausgangsleitung (188) für Asphaltzement gelangt.
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AU2019200959B9 (en) 2021-02-04
AU2019200959B2 (en) 2020-08-13
AU2019200959A1 (en) 2019-08-29
BR102019002643A2 (pt) 2019-10-15
ZA201900728B (en) 2021-09-29
EP3524732A1 (de) 2019-08-14
RU2725976C1 (ru) 2020-07-08
CA3032166C (en) 2020-12-29
CA3032166A1 (en) 2019-08-12

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