CN116537002A - Asphalt mixture heating device based on microwaves - Google Patents
Asphalt mixture heating device based on microwaves Download PDFInfo
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- CN116537002A CN116537002A CN202310236400.1A CN202310236400A CN116537002A CN 116537002 A CN116537002 A CN 116537002A CN 202310236400 A CN202310236400 A CN 202310236400A CN 116537002 A CN116537002 A CN 116537002A
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- waveguides
- microwave
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- 239000000203 mixture Substances 0.000 title claims abstract description 117
- 239000010426 asphalt Substances 0.000 title claims abstract description 114
- 238000010438 heat treatment Methods 0.000 title claims abstract description 48
- 239000002184 metal Substances 0.000 claims description 18
- 238000005192 partition Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 4
- 229920002620 polyvinyl fluoride Polymers 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/08—Apparatus for transporting and heating or melting asphalt, bitumen, tar, or the like
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses a microwave-based asphalt mixture heating device, which belongs to the technical field of pavement restoration treatment and comprises a box body for placing asphalt mixtures, wherein waveguide ports for installing waveguides are uniformly distributed on the upper and lower parts of the box body and are staggered, and the waveguides are connected with a microwave magnetron; the asphalt mixture can be tiled or rotated in the box body, and microwaves generated by the microwave generator can radiate all the asphalt mixture through the waveguide port in a covering manner; the box body is a cylinder, a cuboid or a regular dodecahedron. The waveguide tube arranged up and down of the box body is used for covering and radiating all asphalt mixtures, so that the rapid heating of the internal asphalt mixtures is realized. According to the invention, the asphalt mixture is heated rapidly and uniformly by means of the waveguides arranged up and down the box body, and the asphalt mixture is melted to be conveniently and rapidly paved to repair the pavement, so that theoretical support is provided for site construction.
Description
Technical Field
The invention belongs to the technical field of pavement repair treatment, and particularly relates to a microwave-based asphalt mixture heating device.
Background
With the increasing maturity of microwave technology, microwave technology has not only existed in the traditional aspects of radar, communication, etc., but in various applications today, microwave technology has been developed as a new energy source in more application directions. While the feedback from manufacturers in recent microwave heating studies is far less traditional hot air heating than microwave heating, it has also been shown in literature studies that microwave heating rates and effects are better than traditional heating modes with predominantly heat conduction (hot air).
The traditional asphalt mixture heating mode mainly adopts a heat convection mode, and has the defects that the temperature of a material close to a heat source surface is higher, and the material close to the heat source surface is heated in the asphalt mixture through a heat conduction and heat transfer mode.
Microwave heating provides technical support for rapid heating of asphalt mixtures. However, since the initial state of the asphalt mixture for repairing the ground is solid, how to uniformly heat the asphalt mixture to a semi-fluid state which is convenient for paving becomes a problem to be solved by the technicians.
Disclosure of Invention
The invention aims to provide a microwave-based asphalt mixture heating device, and aims to solve the technical problems that the use performance of an asphalt mixture is affected by long time and uneven heating in the traditional heating mode of the asphalt mixture in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the asphalt mixture heating device based on microwaves comprises a box body for placing asphalt mixtures, wherein waveguide ports for installing waveguide pipes are uniformly distributed on the upper and lower sides of the box body and are arranged in a staggered mode, and the waveguide pipes are connected with a microwave magnetron; the asphalt mixture can be tiled or rotated in the box body, and microwaves generated by the microwave generator can radiate all the asphalt mixture through the waveguide port in a covering manner; the box body is a cylinder, a cuboid or a regular dodecahedron.
Preferably, when the box body is a cylinder, a rotatable bearing platform is arranged at the bottom of the box body, the bearing platform is driven by a power component outside the box body, and the asphalt mixture is placed on the bearing platform; the upper and lower waveguides of the box body are arranged in a concentric ring shape by taking the center of a circle as a center and taking integer multiples of the length d of the waveguides as a radius, and the waveguides are positioned in the concentric ring and are not overlapped.
Further, the waveguide tube is arranged according to a concentric ring shape method:
in the first-stage arrangement, no more than two waveguides are arranged in a circle with the radius of 1 waveguide length, and the two waveguides are on the same diameter;
when the next stage is arranged, the waveguide tube is arranged on a circular ring with the length of the waveguide tube being 1 time as the inner diameter of the circular ring and the length of the waveguide tube being 2 times as the outer diameter of the circular ring, and the central line of the length direction of the waveguide tube is overlapped with the radius direction;
and so on, when the ith stage is arranged, the waveguide tube is arranged on a circular ring with the length of the waveguide tube being i-1 times as the inner diameter of the circular ring and the length of the waveguide tube being i times as the outer diameter of the circular ring, and the central line of the length direction of the waveguide tube is overlapped with the radius direction;
when the waveguides are distributed on the upper part and the lower part of the box body, the waveguides are uniformly distributed by taking the circular ring as a unit.
Preferably, the method for determining the number of the waveguides arranged on the concentric rings is as follows:
the rotation center of the bearing platform is coaxial with the center of the cylindrical box body, when the bearing platform rotates to drive the asphalt mixture to rotate and heat, the known angular speed is the same,
the ith ring needs to be provided with the total area S of the waveguide tube Pipe Area S of the ring Ring(s) The ratio ρ is unchanged, i.e., ρ=s Pipe /S Ring(s)
The annular area of the ith annular ring is S Ring(s) =πd 2 [i 2 -（i-1） 2 ]=πd 2 （2i-1）；
The area of the waveguide is S Pipe =ndw；
Let the ratio of the total area of the waveguide tube to the area of the circular ring be a constant value ρ * Then the number of waveguides arranged on the ith ring is n= [ ρ ] * πd（2i-1）]/w；
Where d is the length of the waveguide and w is the width of the waveguide.
Preferably, when the box body is a cuboid, a wave stirrer is arranged in the box body and used for periodically changing the load state of the magnetron; the wave stirrer is arranged on the inner wall of the box body provided with the waveguide tube.
Preferably, a cross-shaped metal partition plate is arranged in the middle of the asphalt mixture, and the metal partition plate is fixed on a bearing platform or a support for placing the asphalt mixture and is used for separating the asphalt mixture.
Preferably, the space layout requirements of the asphalt mixture in the box body are as follows:
the first asphalt mixture is prohibited from being stacked up and down in a clinging way, if the number of the disposable heating test blocks is small, the asphalt mixture is spread out, the horizontal interval between the adjacent asphalt mixtures is not less than 5cm, the distance between the asphalt mixture and the metal plate is not less than 5cm, and the distance between the asphalt mixture and the waveguide opening is 40 cm-60 cm;
secondly, when the disposable heating asphalt mixture is more, the asphalt mixture is vertically arranged on the bracket at intervals, the upper and lower space intervals of the asphalt mixture are not less than 5cm, and the heating effect is increased by staggered stacking.
Preferably, the bracket is a multi-layer pallet made of polyvinyl fluoride plates.
Preferably, the dimensions of the asphalt mixture are 300mm×300mm×50mm; the waveguide tube selects a rectangular waveguide BJ26 main mode as TE10 mode, and the power of a microwave magnetron corresponding to a single waveguide tube is as follows: 1kW.
Preferably, the real part of complex permittivity of the bituminous mixture ranges [2.7,7.48 ]]And a complex dielectric constant imaginary part range of [0.222,1.073 ]]The relative magnetic conductivity is 1, and the electrical conductivity is 0S/m; the heat conductivity of the asphalt mixture is 0.936W/(m.K), and the density is 2.45 multiplied by 10 3 kg/m 3 Constant pressure heat capacity 1.4×10 3 J/（kg·K）。
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: compared with the prior art, the invention heats the internal asphalt mixture by spreading or rotating asphalt mixture in the box body and utilizing the waveguides arranged up and down of the box body, and microwaves generated by the microwave generator can radiate all the asphalt mixture in a covering way through the waveguides arranged up and down, thereby realizing the rapid heating of the internal asphalt mixture; the box body can be selected from a cylinder, a cuboid or a regular dodecahedron, preferably a regular dodecahedron, and then a cylinder and finally a cuboid. According to the invention, the asphalt mixture is heated rapidly and uniformly by means of the waveguides arranged up and down the box body, and the asphalt mixture is melted to be conveniently and rapidly paved to repair the pavement, so that theoretical support is provided for site construction.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic structural diagram of a microwave-based asphalt mixture heating device (a box body is a cylinder) according to an embodiment of the present invention;
FIG. 2 is a schematic view of the arrangement of the waveguides at the top of the tank of FIG. 1;
FIG. 3 is a schematic view of the waveguide arrangement at the bottom of the tank of FIG. 1;
FIG. 4 is a schematic view of the placement of asphalt mixture on the deck within the tank of FIG. 1;
FIG. 5 is a schematic layout of a top waveguide of a tank in one embodiment of the invention;
FIG. 6 is a schematic view of a rectangular parallelepiped box according to another embodiment of the present invention;
FIG. 7 is a schematic view of the arrangement of the top waveguides of the tank of FIG. 6;
FIG. 8 is a schematic view of the arrangement of the bottom waveguides of the tank of FIG. 6;
in the figure: 00-asphalt mixture, 1-box, 2-waveguide tube, 3-metal partition board, 4-bearing platform, 5-pallet, 6-bracket and 7-stirrer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and 6, the asphalt mixture heating device based on microwaves provided by the invention comprises a box body 1 for placing asphalt mixture 00, wherein waveguide ports for installing waveguide tubes 2 are uniformly distributed on the upper and lower sides of the box body 1 and are staggered, and the waveguide tubes 2 are connected with a microwave magnetron; the asphalt mixture 00 can be tiled or rotated in the box body 1, and microwaves generated by the microwave generator can radiate all the asphalt mixture 00 through the waveguide port in a covering manner; the box body 1 is a cylinder, a cuboid or a regular dodecahedron sphere, preferably a regular dodecahedron sphere, and is selected from the cylinder, and finally the cuboid. Utilize a plurality of wave guides that the box laid from top to bottom can carry out rapid heating to the pitch mixture that the inside was placed.
The principle of heating the asphalt mixture by microwaves is as follows: the high-frequency changing magnetic field generated by the microwaves and the action of the aggregates in the asphalt mixture generate frictional internal energy so as to enable the temperature of the aggregates to rise first, the aggregates heat the asphalt wrapped on the surfaces of the aggregates in a heat conduction mode, the content of the aggregates in the asphalt mixture is generally more than 93%, the particle size of the aggregates is continuous from coarse to fine, and the absorption of the microwaves is increased.
In one embodiment of the present invention, as shown in fig. 1 and 4, when the case 1 is a cylinder, a rotatable supporting platform 4 is provided at the bottom of the case 1, the supporting platform 4 is driven by a power component (not shown) outside the case 1, and the asphalt mixture 00 is placed on the supporting platform 4; the upper and lower waveguides 2 of the box body 1 are arranged in a concentric ring shape by taking the center of a circle as the center and taking integer multiples of the length d of the waveguides as the radius, and the waveguides 2 are positioned in the concentric ring and are not overlapped. The waveguide tube adopting the arrangement mode can ensure the heating uniformity of the internal asphalt mixture 00.
The asphalt mixture is heated rapidly by microwaves, and the specific design content is as follows:
the method for arranging the waveguides according to the concentric circles comprises the following steps:
in the first-stage arrangement, no more than two waveguides are arranged in a circle with the radius of 1 waveguide length, and the two waveguides are on the same diameter;
when the next stage is arranged, the waveguide tube is arranged on a circular ring with the length of the waveguide tube being 1 time as the inner diameter of the circular ring and the length of the waveguide tube being 2 times as the outer diameter of the circular ring, and the central line of the length direction of the waveguide tube is overlapped with the radius direction;
and so on, when the ith stage is arranged, the waveguide tube is arranged on a circular ring with the length of the waveguide tube being i-1 times as the inner diameter of the circular ring and the length of the waveguide tube being i times as the outer diameter of the circular ring, and the central line of the length direction of the waveguide tube is overlapped with the radius direction;
when the waveguides are distributed on the upper part and the lower part of the box body, the waveguides are uniformly distributed by taking the circular ring as a unit, as shown in fig. 2 and 3. As shown in FIG. 5, if 6 waveguides are arranged on the 3 rd ring, 3 waveguides are arranged on the upper and lower sides of the box body.
The method for determining the arrangement quantity of the waveguides on the concentric rings is as follows:
the rotation center of the bearing platform 4 is coaxial with the center of the cylindrical box body 1, when the bearing platform 4 rotates to drive the asphalt mixture 00 to rotate and heat, the known angular speed is the same,
the ith ring needs to be provided with the total area S of the waveguide tube Pipe Area S of the ring Ring(s) The ratio ρ is unchanged, i.e., ρ=s Pipe /S Ring(s)
The annular area of the ith annular ring is S Ring(s) =πd 2 [i 2 -（i-1） 2 ]=πd 2 （2i-1）；
The area of the waveguide is S Pipe =ndw；
Let the ratio of the total area of the waveguide tube to the area of the circular ring be a constant value ρ * Then the number of waveguides arranged on the ith ring is n= [ ρ ] * πd（2i-1）]/w；
Where d is the length of the waveguide and w is the width of the waveguide.
For example, when i=1, the ratio of the total area of the waveguide to the area of the ring is ρ=w/(ρd), if the density value is adopted for other rings, ρ is then set to * When the number of waveguides on the circular ring i=3 is calculated, it is found that,
when the number of waveguides required on the circular ring i=6 is 11, if the radius of the box is 6d，The overall case requires 36 waveguides.
In another embodiment of the present invention, as shown in fig. 6, when the box 1 is a cuboid, a pulsator 7 is disposed in the box 1, for periodically changing the load state of the magnetron; the agitators are provided on the upper and lower inner walls of the opening of the waveguide 2. When in specific installation, the wave stirrer mainly comprises a group of metal refraction blades driven by a small motor. After the wave stirrer is started, the microwave resonance frequency of each mode in the box body is periodically changed, which is equivalent to the continuous displacement of the antinode and the wave node positions of the superimposed standing wave field, thereby improving the uniformity of the distribution of the microwave field in the box body.
When the box body is a cylinder, as shown in fig. 4, a cross-shaped metal partition plate 3 is arranged in the middle of the asphalt mixture 00, the metal partition plate 3 is fixed on a bearing platform 4 for placing the asphalt mixture 00, and the asphalt mixture 00 is separated by the metal partition plate 3. When specifically manufactured, the metal separator is formed by combining two metal plates, and the size of each metal plate is as follows: the length is 70-80cm, the height is 6-7cm, the thickness is 1cm, and the cross-shaped metal plate and the bearing platform for placing the asphalt mixture 00 are welded and fixed together during installation. The cross-shaped metal partition plates are placed between the asphalt mixtures 00, so that radiated microwaves can be refracted, uniform heating of the asphalt mixtures is ensured, and the standard deviation of the average temperature of the asphalt mixtures is reduced. When the box body is cuboid, the metal partition plate 3 is fixed on the bracket 6 for placing asphalt mixture.
When the box body is a cuboid, as shown in fig. 6-8, the cuboid box body 1 adopts a mode that the stirrer 7 replaces a rotary bearing platform to stir internal microwaves while following the waveguide tube layout method, and the stirrer 7 is arranged on the same side wall of the waveguide tube opening. When the stirrer rotates, the load state of the magnetron is periodically changed, so that the magnetron is caused to have larger frequency traction, the working frequency of the magnetron is periodically changed along with the rotation of the stirrer in a frequency domain, and more electromagnetic field modes are excited in the box body.
In a specific design, the space layout requirements of the asphalt mixture in the box body are as follows:
the first asphalt mixture is prohibited from being stacked up and down in a clinging way, if the number of the disposable heating test blocks is small, the asphalt mixture is spread out, the horizontal interval between the adjacent asphalt mixtures is not less than 5cm, the distance between the asphalt mixture and the metal plate is not less than 5cm, and the distance between the asphalt mixture and the waveguide opening is 40 cm-60 cm;
secondly, when the disposable heating asphalt mixture is more, the asphalt mixture is placed on the support 6 at intervals up and down, the interval between the upper space and the lower space of the asphalt mixture is not less than 5cm, and the heating effect is increased by staggered stacking. Wherein, support 6 is the multilayer flatbed frame 5 that is made by polyvinyl fluoride panel, and the four corners position of two or more polyvinyl plates links to each other in proper order through the stand, and the polyvinyl fluoride material has high temperature resistant, non-adhesion's characteristics, utilizes the polyvinyl plate can be effectively with pitch mixture bearing when heating.
In one aspect of the inventionIn a specific embodiment, the asphalt mixture has dimensions of 300mm×300mm×50mm; the waveguide tube selects a rectangular waveguide BJ26 main mode as TE10 mode, and the power of a microwave magnetron corresponding to a single waveguide tube is as follows: 1kW. Complex permittivity real part range of asphalt mixture [2.7,7.48 ]]And a complex dielectric constant imaginary part range of [0.222,1.073 ]]The relative magnetic conductivity is 1, and the electrical conductivity is 0S/m; the heat conductivity of the asphalt mixture is 0.936W/(m.K), and the density is 2.45 multiplied by 10 3 kg/m 3 Constant pressure heat capacity 1.4×10 3 J/（kg·K）。
300mm multiplied by 50mm asphalt mixture is covered over a waveguide pipe orifice, the working power of a microwave generator corresponding to the waveguide pipe is 1kW, the heating time is 4min, and the temperature of the asphalt mixture at the rectangular waveguide pipe orifice is 166.9 ℃ through a thermometer test. In the finite element simulation model, a closed box body with the same size is established, the material parameters refer to the simulation power of the microwave generator as described above, the temperature and time curve of the asphalt mixture at the same position is obtained after heating for 5min, and the simulation model can reach 170 ℃ at the time of 4min and is consistent with the test temperature by comparison, so that the simulation model is verified.
By utilizing the design method of the waveguide tube, the total heating power of the microwave generator is 32kW, the upper magnetron and the lower magnetron are respectively 16, the asphalt mixture is heated on the bearing platform in a rotating way, the number of heated asphalt mixture is 8, the space interval between the boundaries of the test blocks is 5cm, the test blocks are arranged symmetrically up and down, the distance between the test blocks and the mouth of the waveguide tube is 40cm, the box body adopts a cylinder, and when the heating time is 10min, the simulation calculation shows that the volume average temperature of the 8 test blocks is 162.53 ℃, the temperature standard deviation is 10.9 ℃, and compared with other box body schemes, the standard deviation of the scheme is the smallest.
In the foregoing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed above.
Claims (10)
1. The utility model provides a pitch mixture heating device based on microwave which characterized in that: the device comprises a box body for placing asphalt mixture, wherein waveguide ports for installing waveguides are uniformly distributed on the upper and lower sides of the box body and are arranged in a staggered manner, and the waveguides are connected with a microwave magnetron; the asphalt mixture can be tiled or rotated in the box body, and microwaves generated by the microwave generator can radiate all the asphalt mixture through the waveguide port in a covering manner; the box body is a cylinder, a cuboid or a regular dodecahedron.
2. The microwave-based asphalt mixture heating apparatus according to claim 1, wherein: when the box body is a cylinder, a rotatable bearing platform is arranged at the bottom of the box body, the bearing platform is driven by a power component outside the box body, and the asphalt mixture is placed on the bearing platform; the upper and lower waveguides of the box body are arranged in a concentric ring shape by taking the center of a circle as a center and taking integer multiples of the length d of the waveguides as a radius, and the waveguides are positioned in the concentric ring and are not overlapped.
3. The microwave-based asphalt mixture heating apparatus according to claim 2, wherein: the waveguide tube is arranged according to a concentric ring shape method:
in the first-stage arrangement, no more than two waveguides are arranged in a circle with the radius of 1 waveguide length, and the two waveguides are on the same diameter;
when the next stage is arranged, the waveguide tube is arranged on a circular ring with the length of the waveguide tube being 1 time as the inner diameter of the circular ring and the length of the waveguide tube being 2 times as the outer diameter of the circular ring, and the central line of the length direction of the waveguide tube is overlapped with the radius direction;
and so on, when the ith stage is arranged, the waveguide tube is arranged on a circular ring with the length of the waveguide tube being i-1 times as the inner diameter of the circular ring and the length of the waveguide tube being i times as the outer diameter of the circular ring, and the central line of the length direction of the waveguide tube is overlapped with the radius direction;
when the waveguides are distributed on the upper part and the lower part of the box body, the waveguides are uniformly distributed by taking the circular ring as a unit.
4. A microwave-based asphalt mixture heating apparatus according to claim 3, wherein: the method for determining the arrangement quantity of the waveguides on the concentric rings comprises the following steps:
the rotation center of the bearing platform is coaxial with the center of the cylindrical box body, when the bearing platform rotates to drive the asphalt mixture to rotate and heat, the known angular speed is the same,
the ith ring needs to be provided with the total area S of the waveguide tube Pipe Area S of the ring Ring(s) The ratio ρ is unchanged, i.e., ρ=s Pipe /S Ring(s)
The annular area of the ith annular ring is S Ring(s) =πd 2 [i 2 -（i-1） 2 ]=πd 2 （2i-1）；
The area of the waveguide is S Pipe =ndw；
Let the ratio of the total area of the waveguide tube to the area of the circular ring be a constant value ρ * Then the number of waveguides arranged on the ith ring is n= [ ρ ] * πd（2i-1）]/w；
Where d is the length of the waveguide and w is the width of the waveguide.
5. The microwave-based asphalt mixture heating apparatus according to claim 4, wherein: when the box body is cuboid, a wave stirrer is arranged in the box body and used for periodically changing the load state of the magnetron; the wave stirrer is arranged on the inner wall of the box body provided with the wave guide tube.
6. The microwave-based asphalt mixture heating apparatus according to claim 1, wherein: the middle part of the asphalt mixture is provided with a cross-shaped metal partition board, and the metal partition board is fixed on a bearing platform or a bracket for placing the asphalt mixture and is used for separating the asphalt mixture.
7. The microwave-based asphalt mixture heating apparatus according to claim 6, wherein: the space layout requirements of the asphalt mixture in the box body are as follows:
the first asphalt mixture is prohibited from being stacked up and down in a clinging way, if the number of the disposable heating test blocks is small, the asphalt mixture is spread out, the horizontal interval between the adjacent asphalt mixtures is not less than 5cm, the distance between the asphalt mixture and the metal plate is not less than 5cm, and the distance between the asphalt mixture and the waveguide opening is 40 cm-60 cm;
secondly, when the disposable heating asphalt mixture is more, the asphalt mixture is placed on the support at intervals up and down, the interval between the upper space and the lower space of the asphalt mixture is not less than 5cm, and the heating effect is increased by staggered stacking.
8. The microwave-based asphalt mixture heating apparatus according to claim 7, wherein: the bracket is a multi-layer pallet made of polyvinyl fluoride plates.
9. The microwave-based asphalt mixture heating apparatus according to claim 1, wherein: the size of the asphalt mixture is 300mm multiplied by 50mm; the waveguide tube selects a rectangular waveguide BJ26 main mode as TE10 mode, and the power of a microwave magnetron corresponding to a single waveguide tube is as follows: 1kW.
10. The microwave-based asphalt mixture heating apparatus according to claim 1, wherein: complex permittivity real part range of asphalt mixture [2.7,7.48 ]]And a complex dielectric constant imaginary part range of [0.222,1.073 ]]The relative magnetic conductivity is 1, and the electrical conductivity is 0S/m; the heat conductivity of the asphalt mixture is 0.936W/(m.K), and the density is 2.45 multiplied by 10 3 kg/m 3 Constant pressure heat capacity 1.4×10 3 J/（kg·K）。
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| CN202310236400.1A CN116537002B (en) | 2023-03-13 | 2023-03-13 | Asphalt mixture heating device based on microwaves |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310236400.1A CN116537002B (en) | 2023-03-13 | 2023-03-13 | Asphalt mixture heating device based on microwaves |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101217836A (en) * | 2007-12-29 | 2008-07-09 | 厦门大学 | A quick heating device based on energy capture of microwave |
| EP2434054A1 (en) * | 2010-06-28 | 2012-03-28 | Velveth Inlet Corporation s.r.o. | Equipment for microwave heating of reconditioned asphalts roads |
| CN208238524U (en) * | 2018-03-13 | 2018-12-14 | 昆明理工大学 | A kind of bottom rotating type microwave agglomerating furnace |
| CN209493531U (en) * | 2019-02-02 | 2019-10-15 | 南充海丽科技有限公司 | A kind of solid asphalt rapid-heating device |
| CN209816628U (en) * | 2019-04-09 | 2019-12-20 | 贵州师范学院 | Energy-concerving and environment-protective type is used for microwave heating device of bituminous paving |
-
2023
- 2023-03-13 CN CN202310236400.1A patent/CN116537002B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101217836A (en) * | 2007-12-29 | 2008-07-09 | 厦门大学 | A quick heating device based on energy capture of microwave |
| EP2434054A1 (en) * | 2010-06-28 | 2012-03-28 | Velveth Inlet Corporation s.r.o. | Equipment for microwave heating of reconditioned asphalts roads |
| CN208238524U (en) * | 2018-03-13 | 2018-12-14 | 昆明理工大学 | A kind of bottom rotating type microwave agglomerating furnace |
| CN209493531U (en) * | 2019-02-02 | 2019-10-15 | 南充海丽科技有限公司 | A kind of solid asphalt rapid-heating device |
| CN209816628U (en) * | 2019-04-09 | 2019-12-20 | 贵州师范学院 | Energy-concerving and environment-protective type is used for microwave heating device of bituminous paving |
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| CN116537002B (en) | 2023-11-10 |
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