• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a process for the production of asphalt using granular recycling asphalt material. In the method, the granular recycled asphalt material is fed to the drum (1) of a countercurrent drum dryer and passed through the drum (1) while being driven by a hot gas stream (H) entering the drum at a first drum end (B). 1) enters and at a second end of the drum (A) emerges from the drum (1), heated. According to the invention, mineral dust particles ("fillers") are fed into the drum (1) in such a way that dust and particles occupy the inner wall and internals of the drum (1) in the region of the second drum end (A). It has been found that this can significantly reduce the tendency for baking the recycled asphalt material in the drum (1). In addition, a certain proportion of fillers in most asphalt formulations is a mandatory component of the ready-to-install asphalt, so that the addition of the dust particles has no detrimental effect on the asphalt quality.
    公开号:CH712358B1
    申请号:CH01051/17
    申请日:2015-07-28
    公开日:2019-03-29
    发明作者:Thomschke Jan；Hahn Oliver；Nagel Axel
    申请人:Ammann Schweiz Ag；
    IPC主号:
    专利说明:

    description
    Technical Field The present invention relates to a process for producing asphalt using granular recycled asphalt material, a countercurrent drum dryer for use in the process, and the use of the countercurrent drum dryer for asphalt production according to the preambles of the independent claims.
    PRIOR ART In drying and heating installations of granular mineral and / or recycled asphaltic material for the production of asphalt, drum dryers with slightly inclined, rotating drying drums are used, in which a material curtain is formed from the granulated material, which flows from a hot gas stream is enforced. The material to be dried and heated passes through the dryer drum in the same direction as the hot gas stream (DC drum dryer) or in an opposite direction as the hot gas stream (countercurrent drum dryer). The hot gas stream is provided by a hot gas generator mostly fired with fossil fuels such as natural gas, fuel oil or pulverized coal.
    In operation results in recycling asphalt material the problem that the bitumen content in recycled asphalt material, the weight fraction is in the common asphalt formulations at 3% to 8%, in the temperature range between 90 ° C and 120 ° C softens and becomes sticky (transition from solid to the liquid state), which causes the recycled asphalt material to tend to adhere to the walls and internals of the drum in countercurrent drum dryers in the area of the material feed end of the drum and in DC tumble dryers in the area of the material discharge end of the drum. The greater the bitumen content in recycled asphalt material, the more pronounced this problem is. Accordingly, it is not possible with today's drum dryers to process large amounts of recycled asphalt material without caking occur.
    It is therefore an object of the invention to provide methods and devices which do not have or at least partially avoid the aforementioned disadvantages of the prior art.
    This object is solved by the subject matters of the independent claims.
    According to these, a first aspect of the invention relates to a process for producing asphalt using granular recycling asphalt material.
    In the method, the granular recycling asphalt material is fed into the drum of a countercurrent drum dryer and passed under a rotation of the drum through it, thereby from a hot gas stream which enters the drum at a first end of the drum and at a second end of the drum exit, warmed up. The process can be carried out with 100% recycled asphalt material as well as with a proportion of recycled asphalt material and a proportion of virgin mineral material.
    According to the invention dust particles, preferably mineral fine dust (also referred to as "filler"), fed into the drum, such that the inner wall of the drum in the region of the second end of the drum, i. of the drum end, at which the hot gas stream emerges from the drum, is covered with dust particles.
    It has been found that this can significantly reduce the tendency for caking of recycled asphalt material in the drum. In addition, a certain proportion of fillers in most asphalt formulations is a mandatory component of the ready-to-install asphalt, so that the addition of the dust particles has no detrimental effect on the asphalt quality.
    In a preferred embodiment of the process, recycled asphalt material is fed to the drum, i. The drum dryer is driven with 100% recycled asphalt material.
    If it is desired to provide the mineral content not only on the recycled asphalt material, but also to use a certain proportion of virgin mineral material, this can be performed in accordance with another preferred embodiment of the method together with the recycled asphalt through the same drying drum and to be heated. This has the advantage that it is possible to dispense with a separate drying drum and the investment and maintenance costs for the asphalt production plant can be significantly reduced.
    In a further preferred embodiment of the method, the dust particles are supplied separately from the recycled asphalt material and / or the new mineral material in the drum. As a result, the amount supplied and the feeding location can be precisely controlled.
    In this case, it is further preferred to inject the dust particles into the drum, preferably into a zone in the region of the claimed second drum end (ie the drum end at which the hot gas stream leaves the drum), preferably in an area in which the binder of the has a temperature of less than or equal to 120 ° C. By blowing in the dust particles can be directed into the wall areas of the drum.
    The blowing takes place with advantage over one or more axially projecting into the drum blowing lances, which preferably project from the claim according to the second drum end in the drum. Such devices for injecting the dust particles are inexpensive and easy to manufacture and do not require significant maintenance.
    Preferably, exactly one central injection lance is used. As a result, the associated obstruction of the passage cross section of the drying drum can be kept as low as possible.
    Further, it is preferable if the method is a continuous process in which the recycled asphalt material and optionally the virgin mineral material are continuously fed into the drum dryer.
    The supply of dust particles in the drum can be continuous or intermittent, in particular at regular intervals, take place. Depending on the system concept, one or the other variant may be more preferred.
    Advantageously, the drum dryer used in the process is part of a contiguous asphalt production plant, wherein all of the supplied dust particles or at least a majority of the supplied dust particles are collected in this asphalt production plant (for example in the filter). So these are so-called "self-suffixes". This has the advantage that the accumulated in the system dust particles can be recycled and no "foreign filler" or only as much "foreign filler" must be purchased, as required, together with the "autoloader" the proper operation and possibly also the To ensure adherence to the asphalt formulation.
    A second aspect of the invention relates to a countercurrent drum dryer for carrying out the method according to the first aspect of the invention. The dryer comprises a drying drum through which the recycled asphalt material and optionally the additional virgin material is conveyed under rotation of the drum during normal operation and thereby heated by a hot gas stream which enters the drum at a first end of the drum and at a second end of the drum the drum emerges. Further, the drum dryer comprises means for feeding dust particles, preferably fine dust (also referred to as "filler") into the drum, such that the inner wall of the drum in the region of the second end of the drum, i. of the drum end, at which the hot gas stream emerges from the drum, is covered with dust particles.
    It has been found that this can significantly reduce the tendency for caking of recycled asphalt material in the drum. Also, a certain proportion of filler in most asphalt formulations is a mandatory component of the ready-to-install asphalt, so that the addition of the dust particles has no detrimental effect on the asphalt quality.
    Advantageously, the means for supplying the dust particles are adapted to blow the dust particles in the drum of the drum dryer, and preferably in a zone in the region of the aforementioned second drum end, preferably in an area in which the binder in the intended operation by the drum of the tumble dryer funded recycling asphalt material has a temperature less than or equal to 120 ° C. In this zone, the tendency to caking of the material to the inner wall of the drum is typically particularly large.
    Such means for injecting the dust particles preferably comprise one or more axially projecting into the drum blowing lances, which advantageously protrude from the claim according to the second drum end into the drum. Such devices for injecting the dust particles are inexpensive and easy to manufacture and do not require significant maintenance.
    Preferably, the drum dryer has exactly one central Einblaselanze for blowing filler into the drum. As a result, the associated obstruction of the passage cross section of the drying drum can be kept as low as possible.
    In a further preferred embodiment of the drum dryer, the drum in the region of the second end of the drum, i. of the drum end, at which the hot gas stream exits the drum, a non-metallic lining.
    It has been found that this can further reduce the tendency to bake the recycling asphalt material in the drum.
    Is the non-metallic lining of a material which has a thermal conductivity of less than 10 W / mK in a temperature range between 70 ° C and 170 ° C, preferably less than 5 W / mK and more preferably less than 1 W / mK, so a significant additional reduction of adhesion tendency can be achieved.
    Has the surface of the non-metallic lining in normal operation at surface temperatures between 90 ° C and 120 ° C lower adhesion to bitumen than a corresponding (ie gleichgeformte and roughened by the intended contact with the material) steel surface in normal operation at these temperatures, which is preferred, the tendency to cake the recycled asphalt material is further reduced.
    In a first variant, the non-metallic lining of the drum is formed by a non-metallic coating on one or more metallic or ceramic components. This has the advantage that the actual supporting structure of the lining may be formed of a different material, e.g. made of cast iron, which can save depending on the construction cost advantages. It is also possible here to "recondition" worn-out components by re-coating and thereby to feed them into a new life cycle.
    The non-metallic coating may be, for example, a ceramic coating, in particular of titanium carbide, or a plastic coating, in particular of PTFE, PEEK or a ketone. Such materials are particularly well suited for this purpose.
    In another variant, the non-metallic lining of the drum is formed by one or more components of a ceramic material or of a plastic material, preferably of PTFE, of PEEK or of a ketone. The components thus consist of the material forming the lining. Such embodiments have the advantage that a long service life of the non-metallic lining is possible, since a replacement of the components forming them only becomes necessary when the wear is so great that the component strength is no longer guaranteed.
    A third aspect of the invention relates to the use of a countercurrent drum dryer according to the second aspect of the invention for drying and heating granular new mineral material and / or recycled asphalt material for asphalt production.
    BRIEF DESCRIPTION OF THE DRAWINGS Further embodiments, advantages and applications of the invention will become apparent from the dependent claims and from the following description with reference to the figures. Showing:
    1 shows a longitudinal section through the drying drum of an inventive countercurrent drum dryer. and
    Fig. 2 is a perspective sectional view through the task end of the drying drum of Fig. 1;
    3 is a perspective sectional view through the task end of a variant of the drying drum of FIG. 1;
    Fig. 4 shows the detail X of Fig. 3;
    Fig. 5 shows the detail Y of Fig. 3; and
    Fig. 6 is a perspective cross-section through part of the lining of the drum according to Fig. 3 in the region of the task end.
    1 shows the drying drum 1 of a counter-current drum dryer according to the invention for drying and heating granular new mineral material and / or recycled asphalt material for asphalt production in vertical longitudinal section.
    As can be seen, the drum 1 is mounted with mounted on its outer circumference circumferential rings 2 on bearing assemblies (not shown), via which it is set in the intended operation in rotation. It is slightly inclined to the right, so that the direction of passage L of the material during normal operation runs from the left (material inlet area EB) to the right (material outlet area AB).
    The material to be dried and heated occurs at the end of the task A of the drum 1 (claims second drum end) via a material chute 4 in the inlet region EB of the drum 1, from where it by the rotation and inclination of the drum 1 to the discharge end of the B Drum 1 (claims first end of the drum) is conveyed out, and after it has been dried and heated while passing through the drum 1, leaves the drum 1 in a discharge area AB again. The hot gas stream H, which is provided by a fired with fossil fuels such as natural gas, fuel oil or coal dust hot gas generator (not shown), flows through the drum 1 in the opposite direction to the direction L of the material, ie from the discharge end B of the drum 1 to the task end A of the drum 1. On the inner wall of the drum 1 are seen in the direction of passage L after the inlet area EB Schaufelrechen 6 and just before the outlet area AB additional blade plates 7 are arranged with which the material raised during the rotation of the drum 1 and then as a material curtain through the hot gas stream H therethrough is dropped.
    As can be seen in particular in conjunction with Fig. 2, which shows a perspective sectional view through the task end A of the drying drum 1 of Fig. 2, projecting at the end of the task A of this drum 1, a central Einblaselanze 8 in the drum 1, via which during normal operation dust particles (filler) in the
    Drum 1 are blown, such that the inner wall of the drum 1 is covered in the region of this end of the drum A with dust particles.
    As can be seen, this variant of the drum 1 in the region of its task end A over its entire circumference with a 10 mm thick PTFE Plates provided 9 formed lining. The plates 9 are curved following the drum shape and fastened with the help of their peripheral edges cross, running in the drum longitudinal direction and in the circumferential direction fastening strips 10, 11 on the drum inner wall.
    As can be seen from Figs. 4, 5 and 6, which show the details X (Fig. 4) and Y (Fig. 5) of Fig. 3 and a perspective cross section through the PTFE lining of the drum 1 in the area of the task end A (FIG. 6), the plates 9 are fastened to the drum inner wall with the fastening strips 10, 11 in such a way that their boundary edges move in each case in the gap 12 which receives them between the inner wall and the fastening strip 10, 11 can. In this way, the plates 9 can expand unhindered in the drum longitudinal direction and in the drum circumferential direction. In this case, the plates 9 are centered in each case at their peripherally extending boundary edges in the middle of a penetrating into this centering 13.
    While preferred embodiments of the invention are described in the present application, it should be clearly understood that the invention is not limited to these and may be practiced otherwise within the scope of the following claims.
    权利要求:
    Claims (20)
    [1]
    claims
    A process for producing asphalt using granular recycled asphalt material, comprising the steps of: a) providing a countercurrent drum dryer; b) conveying the recycling asphalt material through the drum (1) of the drum dryer under a rotation of the drum (1); c) heating the recycled asphalt material while passing through the drum (1) with a hot gas stream (H) which enters the drum (1) at a first drum end (B) and at a second drum end (A) from the drum (1) exit; d) supplying dust particles, in particular fine dust, in the drum (1) such that the inner wall of the drum (1) in the region of the second end of the drum (A) is coated with dust particles.
    [2]
    2. The method of claim 1, wherein exclusively recycling asphalt material is conveyed through the drum (1) of the drum dryer and heated with the hot gas stream (H).
    [3]
    The method of claim 1, wherein in addition to the recycled asphalt material, granular new mineral material is conveyed through the drum (1) of the drum dryer and heated with the hot gas stream (H).
    [4]
    4. The method according to any one of the preceding claims, wherein the dust particles are fed separately from the recycled asphalt material and / or optionally the new mineral material in the drum (1).
    [5]
    5. The method of claim 4, wherein the dust particles are blown into the drum (1), in particular in a zone in the region of the second end of the drum (A), in particular in a region in which a binder of the through the drum (1) funded recycling asphalt material has a temperature less than or equal to 120 ° C.
    [6]
    6. The method of claim 5, wherein the blowing-in via one or more axially into the drum (1) projecting Einblaselanzen (8), which in particular from the second end of the drum (A) protrude into the drum (1).
    [7]
    7. The method of claim 6, wherein the blowing takes place via a single central blowing lance (8).
    [8]
    8. The method according to any one of the preceding claims, wherein the recycled asphalt material and optionally the virgin material are fed continuously into the drum dryer.
    [9]
    9. The method according to any one of the preceding claims, wherein the dust particles are fed continuously into the drum (1).
    [10]
    10. The method according to any one of claims 1 to 8, wherein the dust particles are fed intermittently into the drum (1), in particular at regular intervals.
    [11]
    A method according to any one of the preceding claims, wherein the drum dryer is part of a contiguous asphalt production plant and at least a portion of the supplied dust particles are collected in said asphalt production plant.
    [12]
    12. Countercurrent drum dryer for use in the method according to any one of the preceding claims, comprising a) a drum (1) through which the recycled asphalt material and optionally the additional virgin material under a rotation of the drum (1) through and conveyed during normal operation is heated by a hot gas stream (H), wherein the drum (1) has a first end of the drum (B), at which during normal operation of the hot gas stream (H) enters the drum (1), and a second end of the drum (A) in which the hot gas stream (H) emerges from the drum (1) during normal operation, and b) means (8) for feeding dust particles, in particular fine dust, into the drum (1) such that the inner wall of the drum (1) in the area of the second end of the drum (A) is covered with dust particles.
    [13]
    13. Countercurrent drum dryer according to claim 12, wherein the means (8) for supplying the dust particles are adapted for blowing the dust particles into the drum (1) of the drum dryer, in particular in a zone in the region of the second end of the drum (A), in particular in one Area in which, during normal operation, a binder of the recycling asphalt material conveyed by the drum (1) of the drum dryer has a temperature of less than or equal to 120 ° C.
    [14]
    14. Countercurrent drum dryer according to claim 13, wherein the means (8) for feeding the dust particles comprise one or more axially into the drum (1) projecting injection lances (8), which in particular from the second end of the drum (A) in the drum (1). protrude.
    [15]
    15. Countercurrent drum dryer according to claim 14, wherein the means (8) for supplying the dust particles have a single central blowing lance (8).
    [16]
    16. Countercurrent drum dryer according to one of claims 12 to 15, wherein the drum (1) of the drum dryer in the region of the second end of the drum (A) has a non-metallic lining (9).
    [17]
    17. Countercurrent drum dryer according to claim 16, wherein the material of the non-metallic lining (9) in a temperature range between 70 ° C and 170 ° C has a thermal conductivity of less than 10 W / mK, in particular less than 5 W / mK, in particular less than 1 W / mK.
    [18]
    18. Countercurrent tumble dryer according to one of claims 16 to 17, wherein the surface of the non-metallic lining (9) at surface temperatures between 90 ° C and 120 ° C has a lower adhesion to bitumen than a corresponding steel surface at these temperatures.
    [19]
    19. Countercurrent drum dryer according to one of claims 16 to 18, wherein the non-metallic lining (9) of one or more components (9) or coated with a ceramic material or from or coated with a plastic material, in particular PTFE, PEEK or a ketone, is formed.
    [20]
    20. Use of the countercurrent drum dryer according to any one of claims 12 to 19 for drying and heating of granular new mineral material and / or recycled asphalt material for asphalt production.
    类似技术:
    公开号 | 公开日 | 专利标题
    DE2504932C2|1985-04-18|Method for processing a solid-laden fluid and fluid nozzle for carrying out the method
    DE3441382C2|1987-07-02|
    DE102015200680B4|2016-05-25|Feed device of a belt drying system and method for controlling a feed device
    AT512170B1|2013-06-15|Device for feeding granules and filling material to an extruder screw of an extruder
    DE2815911A1|1978-10-19|MULTI-STAGE PLASTIC EXTRUSION DEVICE AND EXTRUDER SCREW
    AT516780B1|2018-06-15|Device for preheating a recycled pulp to be dispersed
    EP0157920B2|1995-05-31|Roll for a roller grate, for example for a refuse burning plant or the like
    DE2301464C2|1985-05-09|Method and apparatus for expansion drying liquid containing rubbery polymeric materials
    CH712358B1|2019-03-29|Process for the production of asphalt using granular recycling asphalt material.
    DE3530248C2|1993-08-12|
    DE102006009205B3|2007-06-06|Bituminous material e.g. recycling asphalt, heating method for constructing e.g. road surface, involves isolating heat transfer body from bituminous material after mixing cold mixing material with hot additive
    EP3444549A1|2019-02-20|Cast sheet and drying unit comprising multiple such cast sheets
    EP3253554B1|2022-03-09|Stuffing screw
    WO2017004727A1|2017-01-12|Drum for a drum dryer for the production of asphalt
    WO2003076173A1|2003-09-18|Method for producing screen bars, screen bar comprising a spacer element and press device
    DE1729431C3|1979-05-31|Rotary drum dryers for sludge, in particular pond sludge
    DE3616995C2|1989-08-24|
    EP0024634A1|1981-03-11|Method and apparatus for purifying the exhaust gases of a plant for the production of bituminous coated materials
    WO2008125415A2|2008-10-23|Method and device for separating or classifying material to be fed
    DE202019002531U1|2019-06-27|Spreader roll for a distributor
    EP2437016A2|2012-04-04|Method for drying domestic waste and drying drum for same
    LU82376A1|1980-07-31|DEVICE FOR DRYING AND WARMING TAR OR BITUMEN-COVERED MINERAL MIXTURES
    EP3763217A1|2021-01-13|Method for the preparation of animal feed containing meat
    DE102018208930A1|2019-12-12|Apparatus and process for the preparation and treatment of granules and adapter nozzle for connecting a granulator-producing granulator and a fluidizing apparatus
    DE3023163C2|1990-06-28|
    同族专利:
    公开号 | 公开日
    DE112015006301A5|2017-12-28|
    WO2017015768A1|2017-02-02|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3999743A|1975-08-11|1976-12-28|Mendenhall Robert Lamar|Asphalt-aggregate recycle process and apparatus|
    US4298287A|1980-04-25|1981-11-03|The Mccarter Corporation|Center draft asphaltic concrete drum mixer|
    US6267493B1|1999-06-02|2001-07-31|Cmi Corporation|Drum mixer having a plurality of isolated aggregate transport channels|
    US7357562B2|2003-03-11|2008-04-15|Hawkins Michael R|Counter-flow drum mixer asphalt plant with two stage mixing zone|
    US9492946B2|2013-06-12|2016-11-15|Meeker Equipment Co., Inc.|System for utilizing recycled asphalt pavement and methods thereof|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/CH2015/000111|WO2017015768A1|2015-07-28|2015-07-28|Method for producing asphalt by using granular recycled asphalt material|
    [返回顶部]