• 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:
    An asphalt roofing material recycling system and method is used to recycle new and used (post-consumer) asphaltic materials, such as asphalt shingles, roll roofing material and tar paper which may include granules, fibers or other particles. The asphaltic material, which may be in bundles, is broken up and separated, then supplied to a cooled recycling tank. Dry ice is added at the same time as the asphalt material to be recycled. Dry ice removes any moisture present and supercools the material making it brittle and easier to chip and break up. The recycle tank includes a number of high speed choppers featuring tulip head mulching teeth as well as a horizontal mixing element that agitates the material and ensures that all the material is crushed. The resulting fine powder stream can be separated by sieving and stored as a powder or compressed into bricks or briquettes.
    公开号:BE1019403A5
    申请号:E2010/0474
    申请日:2010-08-02
    公开日:2012-06-05
    发明作者:Robert Zickell；Thomas J Zickell
    申请人:Recycled Asphalt Shingle Technology Llc；
    IPC主号:
    专利说明:

    System and method for recycling asphalt material Cross-references to related applications
    This application claims priority over the provisional US Patent Application No. 61/230,426 filed July 31, 2009 entitled "Asphalt Material Recycling System and Method" which is fully incorporated herein by reference.
    Field of the invention
    The present invention relates to a recycling system and method and in particular to a system and method for recycling a granular and non-granular coated asphalt material such as new and used roofing shingles.
    Background of the invention
    Roofing shingles are conventionally manufactured using asphalt, which is derived from crude oil. Asphalt prices have recently risen even faster than crude oil prices. In addition to the use and cost of crude oil in the asphalt manufacturing process, the asphalt shingle manufacturing process uses a considerable amount of fossil fuels to heat both asphalt and fillers to can be combined. Typically, about 65% filler is mixed with about 35% asphalt.
    In order to create a mixture having a usable viscosity, the asphalt is heated to 450 ° F (232 ° C) while the. The filler is heated to approximately 350 ° F (177 ° C) before the two additives are mixed together.
    Considerable waste is involved in the manufacture and use of asphaltic roofing materials, such as shingles and roll roofing membranes. For example, each new asphalt roofing shingle has cut-out tabs that are removed and discarded (this waste will be referred to as "asphalt roofing shingle waste") while old shingle materials are removed from existing buildings. (This waste will be referred to as "used asphalt shingle waste") is also added to a significant amount of roofing material waste. In the United States alone, 11 million tonnes of used asphalt shingles are removed annually from roofs. Approximately 10 million tonnes are landfilled. Not only does the cost of landfills increase, but access to landfills for recyclables becomes more limited as roof shingles are products that do not degrade. Asphalt shingles pose a particular additional problem to landfills because they limit the natural movement of water causing delays in natural degradation of other elements in the landfill. Asphalt shingles themselves do not degrade and remain permanently in the landfill.
    Recycling of all types of roofing material waste has been addressed and attempted, but has not been terribly successful. Waste generated by asphaltic roofing materials presents a significant recycling and environmental problem due to the composition of the roofing material. Typical shingles consist of a cellulose fiber saturated with asphalt or a fiberglass mat, an asphalt coating on the carpet, and granules placed on the liner. Such materials are difficult to break down and typically require complex recycling processes.
    Past attempts to recycle asphalt shingles have failed to reduce shingle granules to a size small enough for the recycled shingle material to be reused. If the granules in the recycled shingle material are not reduced to a fine powder, the granules will not remain suspended in an asphalt solution and the recycled shingle material can not be reused in roofing or other applications. products. Too fine a granule also poses a problem in that the fine material does not have a significant use and is therefore not salable.
    Some past processes for recycling asphalt roofing material have used grinding machines, such as roller mills, bag mills, hammer mills, saw mills, and the like. to produce a recycled roofing material that can be used only in road construction or other similar "load" material. However, the fact of only grinding the shingle material in a reduction mill without subsequent treatment failed to reduce the granules in the shingle material to a fine grain size so that recycled asphalt can be reused in manufacturing new roofing products.
    Asphalt roads consist of six percent asphalt-grade asphalt and ninety-four percent aggregate. The grain size is very specific and is carefully monitored by national and federal agencies. Attempts to use manufacturing and used shingles have been halted by four major problems. First, chips of 3/8 inch (10 mm) (the standard currently in use) will not dissolve in the mixing process, so little asphalt is released for incorporation into the road (mixing energy entrained is lost) which makes the amount of asphalt and mineral unequal.
    Second, the plastic membrane on the back of all shingles is left 4 to 5 inches (102 to 127 mm) per 1 inch (25.4 mm) piece.
    Third, the nails can not be removed and fourth, the shingles contain too much fine particles. All of these issues create their own set of problems in recycling materials for reuse. Nails can not be present in the recycled material that is intended to be used, and nails in a road would pose a serious problem. Similarly, the presence of fine particles in the pavement creates pockets of air and voids that affect the performance of hot mix asphalt in terms of rutting and cracking. Shingles contain 30 to 40 percent fine particles and the amount of fine particles should be reduced as low as possible because fine particles increase viscosity so more roller energy is required (there are more which passes on the pavement hot) and they can have serious implications on the quality of the road. A new process is needed that resolves all of these issues.
    Apparatus for recycling roof shingles is disclosed in Brock U.S. Patent No. 4,706,893. This apparatus includes a hammer mill that shreds the shingles and a tank that subsequently dries and then mixes the recycled shingle material with liquid asphalt for recycling as an asphalt pavement composition. This grinding process will not reduce the granules in the shingle material to a size small enough for the shingle material to be reused in applications other than an asphalt coating composition. In addition, those parts of the recycled material that are too fine are considered "fine particles" in the road surfacing industry and are undesirable in that they significantly increase the viscosity of the coating mixture and must be removed by washing or take significantly longer to pack up.
    Another shingle reduction apparatus is described in U.S. Patent No. 5,385,426 to Omann. This complex apparatus includes a chipper, two hammer mills, and two heated tanks for drying the shingle material after it has been reduced. This unit also requires spraying the shingles with water before entering the first hammer mill. This extremely complex and confusing process requiring two hammer mills is also not able to completely reduce the granules in the recycled shingle material to a fine particle size or powder.
    One reason that the grinding machines failed to reduce the pellets in the recycled shingle material is because the shingle material was not heated when milled. In the past, heating of the grinding machine when the shingle material is milled was considered dangerous because of the pressure that develops in the closed grinding tank or the heating tank as a result of, the moisture in the material of shingle. Heating would also make the hammer mills dirty and not work because the asphalt would become sticky.
    Summary of the invention
    Thus, the present invention provides an apparatus and method for recycling asphalt material which is capable of recycling asphalt shingle material and reducing granules, cellulose fibers, glass fibers and other particles in the asphalt material of the invention. shingle in a stream of fine-grained powder that can be used at the same time as liquid asphalt or used in a dry form for various purposes.
    The preferred method of recycling asphaltic material comprises crushing by cryogenic means of the asphaltic material in an apparatus which can be sufficiently supercooled so that the asphaltic material to be recycled is substantially pruned, grated and broken down into fine particles for further use in various processes such as the manufacture of asphalt shingles or asphalt road mix.
    Cryogenic treatment can be accomplished using any of the aforementioned mills containing the medium. Or the mill is cooled or the material is cooled before entering the mill or while in the mill. Cold crushing is preferred although the mechanical energy used for crushing becomes heat, which must be counteracted with cooling energy. The road paving industry requires more coarse crushing than roofing materials because fine particles interfere with the compaction process. This is due to the increase in asphalt viscosity that occurs with the introduction of 200 mesh or smaller particles. The cold crushing process lends itself to coarser crushing because the process can be stopped and the material can be tested very quickly using sieves to determine grain size. A hot asphalt test requires a long process of removing the asphalt with solvents, drying the remaining particles, and then sieving. Typically, this would take longer than the crushing cycle. The cold crushing process produces a powder (practically gun-type or black powder) which can be easily stored outside and transported in the coating process without modifying the typical equipment of the coating plant. This convenience is important for the marketability of the product.
    Brief description of the drawings
    These features and advantages of the present invention, as well as others will be better understood from reading the following detailed description taken in conjunction with the drawings in which:
    Fig. 1 is a block diagram of a system and method for recycling asphalt material according to the present invention;
    Fig. 2 is a side view of a given mixing apparatus, by way of example for use in the asphalt recycling system and method according to the preferred embodiment of the present invention;
    Figs. 3A to 3C are views showing an embodiment of the high speed chopper comprising a motor and chopper head for use in the exemplary mixer of the asphalt recycling system and method herein. invention; and
    Fig. 4 is a perspective view of a mixing blade used in the mixer in the preferred embodiment of the present invention.
    Detailed Description of the Preferred Embodiment
    A system and method for recycling asphaltic material 10, FIG. 1, according to the present invention is used to recycle an asphaltic material, such as new and used roof shingles (based on organic product and fiberglass), paper tarred, roll roofing material, reinforced roofing material and other similar asphalt, granular or non-granular coated materials. The granules, fibers or other particles are reduced to a stream of fine particle size that can be stored and reused in the manufacture of new asphalt roofing products, asphalt pavement compositions, and other applications.
    According to the preferred embodiment of the asphaltic material recycling system and method of the present invention, an exemplary system 10, FIG. 1, is illustrated. In this figure, asphalt-based products such as asphalt roofing roofing waste and used asphalt shingle scrap 12 are provided in a hopper 14 attached to a material conditioner 16. Material 16 is designed with a band 18 having a number of teeth 20, which serve to cut into pieces and separate any used material from shingle, packets or otherwise compacted, of either type. The separation of this material is important for subsequent recycling.
    The used shingle material 12 to be treated leaves the material conditioner on a sorting belt 22. This phase possibly allows human or mechanical means to remove unwanted debris such as nails, wood, metal or the like. The separation can be done by a magnet or by hand using one or more people sorting the material. As currently contemplated, the recycling system will be operated batchwise and thus a predetermined amount of used shingle material 12 will be supplied to the material conditioner 16, sent on a sorting belt 22 and then inserted into the recycler 24.
    The exemplary recycler 24 available from H. C. Davis Sons Mfg. is illustrated in greater detail in FIG. 2 and comprises a horizontal mixing and crushing chamber or recycling chamber 26 having a first motor 28 which drives a horizontally displaced mixing blade illustrated in greater detail in FIG. central rod member from which a number of mixing vanes extend; some pallets with serrated teeth and other pallets that have smooth edges. The mixing paddles extend very close to the inner wall of the mixing chamber to ensure that all the material to be recycled within the recycler 24 is captured and processed. Figure 3a shows how the tulip-shaped chopper head 36 (which will be described in more detail below) is based away from the wall of the recycle chamber as one of the pallets passes very close to the wall of the recycling chamber.
    The recycler 24 further comprises one or more high speed choppers 32 shown in greater detail in FIGS. 3. One or more high speed choppers include a motor 34 rotating one or more tulip-shaped chopper heads 36 The chopper heads 36 rotate at a high revolution speed and serve to dislocate all the asphalt material to be recycled within the recycler 24.
    In the preferred embodiment, the recycler 24 is operated in a cold or cooled mode. The recycle chamber 26 has a casing and circulates a glycol-based coolant cooled to 30 ° F (-1 ° C) around the casing and serves to cool the recycle chamber 26. Also, importantly, dry ice is added to the recycling chamber 26 at the same time as the shingle waste to be recycled. Dry ice is used to cause any moisture in the material to be recycled and, most importantly, makes the material very brittle, which facilitates the shredding of shingle waste by high speed choppers and the mixing blade. of a horizontal mixing system. The asphalt becomes brittle and breaks at about 35 ° F (2 ° C), while shredder-type systems must use brute force to shred the shingles.
    Alternatively, the recycler 24 may be operated in a hot or heated mode. In this heated mode, asphalt, oil, wax, polymer or other material may be added to make a slurry suitable for addition to a friction mill. The plenum 14 supplying the material conditioner 16 may comprise choppers or grinders for initially conditioning or shredding the material which is introduced into the rebrner 24. The teeth and half-planes of the horizontal mixing system prevent the unit from clogging even if the packages are placed in full. The different distance from the tank walls along the alternation of serration and planes allows the design to function properly.
    Because it is contemplated that the system of the present invention is operated in batch mode, the recycler 24 will be operated with a predetermined amount of used shingle material for a predetermined period of time to obtain a recycled product having the size or fineness of the desired grain. Dry ice will evaporate as a gas.
    The treated or recycled material, and now in the form of a powder, will be removed from the mechanism of the recycler 24 as generally illustrated at 40, FIG. 1 and will be supplied to a sorter 42. The sorter 42 serves to separate the asphalt powder. recycled using a sieve or similar sorting mechanism. The process is designed to separate the particles in the original raw material distribution. This allows the granules (11 to 16 mesh) to remain intact, while the load and "load coat" of the asphalt (50 to 250 mesh) are separated. In the preferred embodiment, the primary separation of the process is 40-50 mesh, which allows separation between the lower particle size of the surface pellet specification and the upper particle size of the charge specification. This preferred separation is also the ideal size for making other asphalt-based products, such as roadblocks, roof coatings and roof liners. For example, the 200 mesh material can be reused by the asphalt roofing industry because the 200 mesh size is compatible with the current description and manufacturing process.
    The asphalt dissolves instantly in usual equipment because it is available as a 200 mesh powder and it also coats the granules. This advantageous coating occurs in the recycling machine. The hot mix process consists of heating the asphalt and the aggregate separately and then mixing them in a propeller mixer. The propeller mixer wets or completely coats the aggregate with asphalt. Asphalt combines the aggregates together as an adhesive to form the road. This process fully exploits the entrained energy of the mixture and solves the problems that have been observed with the attempt to recycle post-manufacturing and used shingles.
    The industry currently uses 3/8 inch (10 mm) chips and these 3/8 inch (10 mm) chips will not dissolve in the mixing process, which has caused a major problem in the process. recycling. 3/8 inch (10 mm) chips have caused a major consistency problem because the chips are made in a "shredding" process. A massive amount of power is required to tear the shingles to the required size. Shingles are uneven as they get older, and because of roofing, the shredder process adds to the problem. No attempt can be made to control either the particle size or the percentage of asphalt. For this reason, the new process allows either solids or asphalts to be easily added, so that the product will be regular.
    The currently used shredder method uses magnets to remove nails, with only about 90 percent success rate on ferrous nails and a very low success rate with aluminum nails. To remove all nails to ensure that nails are not present in the final material, a two-step process is used. The new two-step process uses a sieve in combination with an air classification. This double process ensures that no nail will pass into the final product. Or air or sieves also easily separate the plastic film. It is also important to create an end product that can create a road surface that has a minimum of voids and air pockets to ensure superior quality. The new process easily allows the percentage of fine particles to be reduced to at least 12 percent.
    The combination of air and sieve also serves to separate the impregnated felt fraction. In organic shingles, the impregnated felt fraction accounts for 18 percent of the raw material mix. The material is 37 percent asphalt and 63 percent cellulose fiber. The asphalt is moderately oxidized at a melting point of 150 ° F (66 ° C) retaining more of the oil content (another asphalt is oxidized at 235 ° F (113 ° C)) and is not mixed with a charge. This asphalt is located in the center of the shingle and has not been degraded by ultraviolet exposure. This impregnating asphalt is the most valuable component in the shingle and is inseparable from cellulose fiber, but this is positive in applications that require cellulose and asphalt, such as roof coatings. This fraction of the shingle also has the capacity to be stored with only moderate agitation. This can be contrasted with a "solid coating" which requires significant agitation to maintain the dense charge in solution. The impregnated felt segment can be stored in tanks normally used by the road surfacing industry. The impregnated felt fraction can also be burned in oil burning equipment if it is mixed with the usual oil and the resulting cellulose becomes a valuable source of energy.
    Granules that fall into the grain size of 11 to 50 jnsh have been carefully selected by the roofing industry because every empty space on a roof surface must be filled. A major objective of granules is to protect the asphalt from ultraviolet degradation. The granules are designed for waterproofing and have a very low volume of voids. These properties make the particles ideal for use in hot mix asphalt and cold pellets used to repair pot holes.
    Particles of a predetermined and appropriate size may be provided for use in a road asphalt mix, while other particles of another suitable size may be provided for reuse in the manufacture of asphalt shingles. Other uses for recycled asphalt particles are also contemplated. The recycled asphalt particles may comprise a granular material, which. is often placed over roof shingles. Recycled asphalt shingle waste particles can be stored and supplied in powder form or alternatively, can be pressed into bricks or briquettes for multiple uses and for ease of storage and transportation.
    One of the products that can be made using the product of the process and method of the present invention is panels. These panels include, in one embodiment, a fiberglass mat layer on the upper and lower surface with shredded shingles in the center. These panels have a preferred thickness of 1/4 inch (5 mm). This makes a rigid product that has many uses, including recovery panels, intermediate cladding panels and sound insulation panels.
    Rework panels are panels that go between an old low-sloped commercial roof and a new roof. The old roof is left in place. Although return panels are currently available, the asphalt portion consists of virgin asphalt and filler, usually lime. In accordance with the present invention, the crushing process releases the fiberglass or other organic fibers, which become reinforcements in the new panel. Tall oil can be added, which has a very positive function in the product. This is a natural glue that makes the panel much stronger than other prior art products. This is important because the panel is the foundation for a new roof. The panel is mechanically fixed through the old roof and the roof platform. The new roof is virtually glued to the top surface of the recovery board. Panels typically can be made with 50 to 66 percent less tall oil than flow asphalt. Each of these materials being a fuel, it is better that there is less of it.
    Another product that can be made from the present invention is an intermediate coating. Commercial buildings usually have a special plasterboard layer underneath the outside in metal, brick or concrete. The main feature of this product is that again, it passes a class A fire rating.
    Another product that can be made from the present invention is a sound insulation board. Asphalt has substantial proven properties of sound transmission. Once again, a class A fire rating is essential. This product can be used underneath a layer of plaster on the inside walls of a building.
    The present invention is not intended to be limited to a device or method that must satisfy one or more of the stated or implied objects or features of the invention and should not be limited to the preferred embodiment (s). (s), given as an example or principal (principal) described here. Modifications and substitutions by those skilled in the art are considered to be within the scope of the present invention, which should not be limited except by the permitted claims and their legal equivalents.
    权利要求:
    Claims (22)
    [1]
    A system for recycling asphalt, comprising: a hopper, configured to receive asphalt material for recycle, said hopper coupled to a material conditioner, wherein the material conditioner comprises a web having one or more teeth, wherein one or more teeth are configured to tear and separate said asphalt material to be recycled; an asphaltic material recycler, coupled to said material conditioner and configured to receive said torn asphalt material and separated by said material conditioner, said asphaltic material recycler having a recycle chamber, at least one engine (28), including a central rod with one or more pallets and one or more high speed choppers, wherein said central rod member with one or more vanes is coupled to and at least one motor (28) and placed in said recycling chamber, said pallets mixture extend near the inner wall of the recycle chamber coupled to said at least one motor and located in said recycle chamber, wherein one or more high speed choppers (36) are coupled to the at least one engine (34). and placing in said recycling chamber said high speed choppers configured to crush said asphalt material to be recycled; and a sorter, coupled to said asphaltic material recycler and configured to separate the granules from the filler and the asphalt-filled coating, wherein said sorter separates the asphaltic material to be recycled into at least two different particle sizes.
    [2]
    2. System according to claim 1, wherein the sorter allows the separation of asphalt grain size from 40 to 50.
    [3]
    The system of claim 1, wherein said material conditioning system further comprises a nail removal device for removing nails and other metal objects from said asphalt material to be recycled.
    [4]
    The system of claim 1, wherein the system is operated in batch mode, wherein the batch mode allows the recycler to be operated for a predetermined period of time based on the amount of asphalt material to be recycled and a desired grain size or fineness of a final asphalt product.
    [5]
    The system of claim 1, wherein the recycler operates in a cooled mode, whereby the recycle chamber is surrounded by an envelope and is cooled by circulating a cooled glycol coolant around the envelope.
    [6]
    The system of claim 1, wherein dry ice is added to the recycling chamber during operation.
    [7]
    The system of claim 1, wherein the recycler is operated in a heated mode.
    [8]
    The system of claim 7, wherein asphalt, oil, wax or a polymer is added to the recycler to make a slurry suitable for addition to a friction mill.
    [9]
    The system of claim 1, wherein the one or more high speed choppers each comprise a motor that rotates one or more tulip-shaped chopper heads that serve to dislocate the asphalt material within the recycle chamber. .
    [10]
    The system of claim 1, further comprising a sorting belt, coupled to the material conditioner, wherein the sorting belt allows for human or mechanical removal of undesirable debris from the asphalt material to be recycled before the asphaltic material is inserted into the material. the recycler.
    [11]
    The system of claim 1, wherein the asphalt material to be recycled is selected from the group consisting of roofing shingle, tar paper, roll roofing material, reinforced roofing material, and other granular asphalt surfacing materials. non-granular.
    [12]
    The system of claim 1 wherein an asphalt material produced from the sorter is adapted for use in new asphaltic products such as roof shingles or asphalt paving compositions.
    [13]
    13. A process for recycling an asphalt material comprising the following steps: placing the asphalt material to be recycled in a hopper attached to a material conditioner, wherein the material conditioner comprises a band comprising one or more teeth, in which one or more teeth are configured to tear and separate the asphaltic material; supplying the packaged asphaltic material to be recycled to a recycler, coupled to said material conditioner, said recycler comprising a recycle chamber, one or more motors and one or more high speed choppers and a central rod member with one or more pallets; and supplying the recycled asphalt material from the recycle chamber to a sorter configured to separate the granules from the filler and the asphalt-filled coating, and wherein the sorter produces a recycled asphalt material of coarse to fine grain size that can be stored and reused in the manufacture of asphaltic products, wherein this recycled asphalt material, which is coarse to fine, comprises at least two specific particle size dimensions.
    [14]
    The method of claim 13, wherein the sorter provides 40-50 mesh separation.
    [15]
    The method of claim 13, further comprising the action of removing the nails from the material to be recycled.
    [16]
    The method of claim 13, wherein the method is operated in batch mode, wherein the batch mode allows the recycler to be operated for a predetermined period of time based on the amount of asphalt material to be recycled and a desired grain size or fineness of a final recycled asphalt product.
    [17]
    The method of claim 13, wherein the recycler operates in a cooled mode.
    [18]
    18. The method of claim 13, wherein the recycler is operated in a heated mode.
    [19]
    The method of claim 13, wherein one or more high speed choppers each comprise a motor that rotates one or more tulip-shaped chopper heads that serve to dislocate all asphaltic material within the chamber. recycling.
    [20]
    The method of claim 13, further comprising the step of circulating the asphaltic material along a sorting web coupled between the material conditioner and the recycler, wherein the sorting web allows for human removal or mechanical undesirable debris of asphalt material.
    [21]
    The method of claim 13, wherein the asphaltic material is selected from the group consisting of roof shingles, tarred paper, roll roofing material, reinforced roofing material and other asphalt containing materials, granular or non-granular.
    [22]
    The method of claim 13, wherein the coarse to fine-grained asphaltic material is useful in creating asphaltic products such as roofing shingles or asphalt paving compositions.
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    同族专利:
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    法律状态:
    2018-05-03| MM| Lapsed because of non-payment of the annual fee|Effective date: 20170831 |
    优先权:
    申请号 | 申请日 | 专利标题
    US23042609P| true| 2009-07-31|2009-07-31|
    US23042609|2009-07-31|
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