CN117166319B - Production device and process of large-proportion hot-recycled asphalt mixture - Google Patents
Production device and process of large-proportion hot-recycled asphalt mixture Download PDFInfo
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- CN117166319B CN117166319B CN202311453656.4A CN202311453656A CN117166319B CN 117166319 B CN117166319 B CN 117166319B CN 202311453656 A CN202311453656 A CN 202311453656A CN 117166319 B CN117166319 B CN 117166319B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 173
- 239000000203 mixture Substances 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title description 6
- 238000003756 stirring Methods 0.000 claims abstract description 282
- 239000003546 flue gas Substances 0.000 claims abstract description 119
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 116
- 239000000779 smoke Substances 0.000 claims abstract description 113
- 238000002485 combustion reaction Methods 0.000 claims abstract description 70
- 239000007789 gas Substances 0.000 claims abstract description 59
- 239000002699 waste material Substances 0.000 claims abstract description 48
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 238000012216 screening Methods 0.000 claims abstract description 25
- 230000008929 regeneration Effects 0.000 claims abstract description 15
- 238000011069 regeneration method Methods 0.000 claims abstract description 15
- 238000000746 purification Methods 0.000 claims abstract description 9
- 238000012806 monitoring device Methods 0.000 claims description 61
- 230000010354 integration Effects 0.000 claims description 43
- 239000012492 regenerant Substances 0.000 claims description 25
- 238000004458 analytical method Methods 0.000 claims description 23
- 239000001301 oxygen Substances 0.000 claims description 19
- 229910052760 oxygen Inorganic materials 0.000 claims description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 18
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 239000000567 combustion gas Substances 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 description 23
- 238000004064 recycling Methods 0.000 description 9
- 239000002737 fuel gas Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 150000002430 hydrocarbons Chemical group 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Road Paving Machines (AREA)
Abstract
The production device comprises a waste crushing unit, a waste screening unit, a stirring unit, a smoke collecting unit, a smoke integrating unit and a central controller which are sequentially connected; the first stirring unit, the second stirring unit, the third stirring unit and the fourth stirring unit are respectively connected with the smoke collecting unit, and the smoke collecting unit temporarily stores blue smoke generated by heating asphalt; the flue gas collecting unit is connected with a flue gas integrating unit sleeved on the fourth stirring unit, and the flue gas integrating unit heats the fourth stirring unit and combusts and purifies blue smoke generated by asphalt heating. The invention collects and burns and purifies blue smoke when asphalt is heated and regenerated, and reduces the regeneration cost of asphalt mixture while improving the regeneration proportion of hot asphalt mixture; and the purified air is monitored, the combustion temperature is adjusted in time, and the quality of exhaust gas after blue smoke combustion and purification is ensured.
Description
Technical Field
The invention relates to the technical field of asphalt materials, in particular to a production device and a production process of a large-proportion hot recycled asphalt mixture.
Background
A large amount of waste materials can be generated in the process of repairing and reforming the old road, and the waste materials still have high utilization value as road materials. Therefore, recycling of old materials is also used as one of the major repair schemes.
At present, asphalt regeneration is mainly performed through hot mix plant regeneration, namely milling waste is transported to an asphalt mixing plant in the cold milling and hot paving construction of the old pavement, and mixed and stirred with new asphalt materials, regenerants and new aggregates in a hot state according to a certain proportion to form an asphalt mixture meeting the requirements.
Moreover, the performance difference between the regenerated asphalt reaching the standard and the new asphalt is not large, but the production cost of the regenerated asphalt is far lower than that of the new asphalt in the production process of the regenerated asphalt and the new asphalt. However, in the production of reclaimed asphalt, reclaimed asphalt is now obtained mainly by mixing old asphalt with new asphalt.
However, since the old asphalt produces blue smoke which causes serious pollution to the environment in the regeneration process, in order to avoid the generation of excessive blue smoke when the old asphalt is regenerated, the addition proportion of the old asphalt is strictly controlled, so that the utilization rate of the old asphalt is very low, the existing old asphalt cannot be better utilized, and the production cost of asphalt mixture cannot be reduced to a great extent.
Accordingly, the problems of the prior art are to be further improved and developed.
Disclosure of Invention
(one) object of the invention: in order to solve the problems in the prior art, the invention aims to provide a device and a process for producing a large-proportion hot recycled asphalt mixture.
(II) technical scheme: in order to solve the technical problems, the technical proposal provides a production device of a large-scale hot recycled asphalt mixture, which comprises a waste crushing unit, a waste screening unit and a stirring unit which are connected in sequence,
the waste crushing unit is used for crushing the recycled asphalt pavement to obtain asphalt crushed aggregates; the waste screening unit screens the asphalt crushed aggregates to obtain multi-stage asphalt crushed aggregates; the first stirring unit, the second stirring unit and the third stirring unit of the stirring unit respectively pretreat the multi-stage asphalt crushed aggregates to obtain hot asphalt crushed aggregates; the fourth stirring unit of the stirring unit adds the regenerant into the hot asphalt crushed aggregates, and then carries out mixed heating, stirring and regeneration to obtain a regenerated asphalt mixture;
the device also comprises a smoke collection unit, a smoke integration unit and a central controller, wherein the central controller is respectively connected with the waste crushing unit, the waste screening unit, the stirring unit, the smoke collection unit and the smoke integration unit;
The first stirring unit, the second stirring unit, the third stirring unit and the fourth stirring unit are respectively connected with a smoke collecting unit, and the smoke collecting unit temporarily stores blue smoke generated by heating asphalt; the flue gas collection unit is connected with a flue gas integration unit sleeved on the fourth stirring unit, and the flue gas integration unit heats the fourth stirring unit and combusts and purifies blue smoke generated by asphalt heating.
The production device of the large-proportion heat regenerated asphalt mixture comprises a fourth stirring unit, a smoke integration unit and a third stirring unit, wherein the fourth stirring unit is of a cylindrical structure, the smoke integration unit is of a circular cylinder structure, and the central axis of the smoke integration unit is overlapped with the central axis of the fourth stirring unit;
the diameter difference between the inner ring diameter of the smoke integration unit and the diameter of the fourth stirring unit is more than 0cm and less than or equal to 3cm, and a heat conducting medium is arranged between the smoke integration unit and the fourth stirring unit.
The production device of the large-proportion heat regeneration asphalt mixture, wherein a plurality of groups of combustion pipelines and flame monitors are arranged in the flue gas integration unit,
the combustion pipeline comprises a flue gas channel, a combustion-supporting channel and a spare combustion channel, the flue gas channel is used for leading blue smoke collected by the flue gas collecting unit into the flue gas integrating unit, the combustion-supporting channel is used for leading air/oxygen into the flue gas integrating unit, and the spare combustion channel is used for leading spare combustion gas into the flue gas integrating unit so as to realize the combustion of the blue smoke and the heating of the fourth stirring unit; the flame monitor detects the flame temperature and sends the flame temperature to the central controller in real time.
The storage unit stores a seventh temperature threshold interval of the fourth stirring unit, a fourth pressure threshold of the flue gas collection unit and a fifth pressure threshold, wherein the seventh temperature threshold interval is 140-180 ℃, the fourth pressure threshold is a pressure value corresponding to the lowest concentration of blue smoke combustion in the flue gas collection unit, and the fifth pressure threshold is a pressure warning value in the flue gas collection unit;
when the temperature monitored by the fourth temperature monitoring device in the fourth stirring unit is the lowest temperature of the seventh temperature threshold interval, heating the fourth stirring unit; at this time, if the pressure value monitored by the second pressure monitoring device in the flue gas collecting unit is greater than a fourth pressure threshold value, starting blue smoke combustion;
and stopping heating the fourth stirring unit when the fourth temperature monitoring device monitors that the temperature is the highest temperature in the seventh temperature threshold section.
The production device of the large-proportion thermal regeneration asphalt mixture comprises a central controller, wherein the central controller comprises an analysis unit, after the pressure value monitored by a second pressure monitoring device in a flue gas collection unit is larger than a fourth pressure threshold value, the central controller obtains the current weather and the temperature, and the analysis unit estimates whether the pressure value in the flue gas collection unit is smaller than a fifth pressure threshold value or not according to a cooling temperature comparison table stored in a storage unit of the central controller and a pressure change curve of the second pressure monitoring device in the time required for the temperature in a fourth stirring unit to be reduced to the lowest temperature in a seventh temperature threshold value interval.
In the production device of the large-proportion thermal regeneration asphalt mixture, when the temperature in the fourth stirring unit is reduced to the lowest temperature in the seventh temperature threshold interval, and the pressure value in the flue gas collection unit is larger than or equal to the fifth pressure threshold, the analysis unit confirms whether the temperature in the fourth stirring unit exceeds the highest temperature in the seventh temperature threshold interval by burning blue smoke according to the pressure change curve of the second pressure monitoring device, the upward temperature comparison table and the downward temperature comparison table stored in the storage unit.
When the temperature in the fourth stirring unit exceeds the highest temperature in a seventh temperature threshold interval, the flue gas collecting unit is connected with a standby collecting unit, so that the pressure value in the flue gas collecting unit is smaller than a fifth pressure threshold;
and when the temperature in the fourth stirring unit is smaller than or equal to the highest temperature in the seventh temperature threshold interval, the analysis unit confirms that the pressure value in the smoke collection unit is equal to a fifth pressure threshold, and blue smoke combustion is started.
The production device of the large-proportion thermal regeneration asphalt mixture, wherein the calculation unit of the central controller updates the lower temperature comparison table and the upper temperature comparison table according to the current weather and the temperature,
the calculation unit updates the cooling temperature comparison table according to the current weather and temperature and the current temperature of the fourth stirring unit in which the temperature is reduced in unit time;
and the calculation unit updates the rising temperature comparison table according to the current weather and temperature, the temperature increment of the fourth temperature monitoring device in the unit time of the current standby gas combustion and the temperature increment of the fourth temperature monitoring device in the unit time of the blue smoke combustion.
The production device of the large-proportion heat regenerated asphalt mixture is characterized in that the flue gas integration unit is provided with an exhaust gas discharge port, the exhaust gas discharge port is connected with an exhaust gas purification unit, and the exhaust gas purification unit purifies the gas after the combustion of the flue gas integration unit and then discharges the purified gas;
when blue smoke combustion is started, the central controller receives PM values of exhaust gases monitored by an air quality monitor arranged in a channel between the exhaust gas discharge port and the exhaust gas purification unit in real time, when the PM values of the exhaust gases are larger than or equal to an eighth threshold value, the analysis unit reads real-time flame temperature, and after judging the reason for increasing the PM values, the inflow amount or the combustion temperature of oxygen/air is adjusted;
The eighth threshold value is a preset value and stored in the storage unit, and is a standard value of the PM value of the exhaust gas, and when the PM value of the exhaust gas is equal to or greater than the eighth threshold value, the exhaust gas is abnormal.
The production process of the large-proportion heat-regenerated asphalt mixture is applied to the production device of the large-proportion heat-regenerated asphalt mixture and specifically comprises the following steps of,
step one, crushing the recycled asphalt pavement by a waste crushing unit to obtain asphalt crushed aggregates;
step two, the asphalt crushed aggregates are screened by a waste screening unit to obtain multi-stage asphalt crushed aggregates;
step three, the first stirring unit, the second stirring unit and the third stirring unit of the stirring unit respectively pretreat the multi-stage asphalt crushed aggregates to obtain hot asphalt crushed aggregates;
step four, adding a regenerant into the hot asphalt crushed aggregates by a fourth stirring unit of the stirring unit, and then carrying out mixed heating, stirring and regeneration to obtain a regenerated asphalt mixture;
the first stirring unit, the second stirring unit, the third stirring unit and the fourth stirring unit in the third step and the fourth step are respectively connected with a smoke collecting unit, and the smoke collecting unit temporarily stores blue smoke generated by heating asphalt; the flue gas collection unit is connected with a flue gas integration unit sleeved on the fourth stirring unit, and the flue gas integration unit heats the fourth stirring unit and combusts and purifies blue smoke generated by asphalt heating.
(III) beneficial effects: the invention provides a production device and a production process of a large-proportion hot-recycling asphalt mixture, which are used for collecting and burning and purifying blue smoke generated during asphalt heating and recycling, so that the purification cost of asphalt recycling pollution is avoided, and the recycling cost of the asphalt mixture is reduced while the recycling proportion of the hot asphalt mixture is improved; meanwhile, the purified air is monitored in real time, the combustion temperature of the blue smoke is adjusted in time, and the quality of exhaust gas after the blue smoke is combusted and purified is guaranteed.
Drawings
FIG. 1 is a schematic diagram of the connection of a production device for a large-scale hot recycled asphalt mixture of the invention;
FIG. 2 is a schematic diagram of the positional relationship between a fourth stirring unit and a flue gas collecting unit of the large-scale heat-regenerated asphalt mixture production device of the invention;
FIG. 3 is a schematic diagram showing the connection relationship between a central controller and each component of the large-scale hot recycled asphalt mixture production device;
100-a waste crushing unit; 200-a waste screening unit; 301-a first stirring unit; 302-a second stirring unit; 303-a third stirring unit; 304-a fourth stirring unit; 3041-a stirring barrel; 3042-a rotation axis; 400-flue gas collection unit; 500-flue gas integration units; 501-a first cylindrical shell; 502-a second cylindrical housing; 503-a third annular housing; 504-a fourth annular housing; 505-flue gas inlet; 506-a fuel gas inlet; 507-oxygen inlet; 600-an exhaust gas purifying unit.
Detailed Description
The present invention will be described in further detail with reference to the preferred embodiments, and more details are set forth in the following description in order to provide a thorough understanding of the present invention, but it will be apparent that the present invention can be embodied in many other forms than described herein, and that those skilled in the art may make similar generalizations and deductions depending on the actual application without departing from the spirit of the present invention, and therefore should not be construed to limit the scope of the present invention in the context of this particular embodiment.
The drawings are schematic representations of embodiments of the invention, it being noted that the drawings are by way of example only and are not drawn to scale and should not be taken as limiting the true scope of the invention.
The apparatus for producing the high-proportion hot-recycled asphalt mixture is shown in fig. 1, and comprises a waste crushing unit 100, a waste screening unit 200, a stirring unit, a flue gas integration unit 500 and a central controller. The discharge gate of the broken unit 100 of waste material with the feed inlet of waste material screening unit 200 is connected, the pitch crushed aggregates export of the different grades of waste material screening unit 200 is connected with corresponding stirring unit respectively, the flue gas collecting channel of stirring unit respectively with flue gas integration unit 500 is connected. As shown in fig. 3, the central controller is connected with the waste crushing unit 100, the waste screening unit 200, the stirring unit, and the flue gas integrating unit 500 by wired or wireless means, respectively.
The waste crushing unit 100 crushes the recovered asphalt pavement to obtain asphalt crushed aggregates.
The waste screening unit 200 screens the asphalt crushed aggregates to obtain multi-stage asphalt crushed aggregates. The multi-stage asphalt particles may include coarse asphalt particles, medium asphalt particles, and fine asphalt particles. The particle size of the coarse asphalt particles is preferably 16-32mm, the particle size of the medium asphalt particles is preferably 6-16mm, and the particle size of the fine asphalt particles is preferably 0-6mm.
The stirring unit is used for respectively preprocessing the multi-stage asphalt crushed aggregates: heating and stirring to obtain hot asphalt crushed aggregates. The stirring units comprise a first stirring unit 301, a second stirring unit 302 and a third stirring unit 303, wherein the first stirring unit 301 is used for pretreating coarse asphalt particles, the second stirring unit 302 is used for pretreating medium asphalt particles, and the third stirring unit 303 is used for pretreating fine asphalt particles to respectively obtain corresponding hot asphalt particles. The stirring unit further comprises a fourth stirring unit 304, and the fourth stirring unit 304 is used for mixing, heating, stirring and regenerating the pretreated multi-stage asphalt crushed aggregates in the first stirring unit 301, the second stirring unit 302 and the third stirring unit 303 to obtain a regenerated asphalt mixture.
The first stirring unit 301, the second stirring unit 302, the third stirring unit 303 and the fourth stirring unit 304 are respectively connected with the flue gas integration unit 500 through the flue gas collecting channels, and the flue gas integration unit 500 carries out combustion treatment on blue smoke generated by the asphalt crushed aggregates in the stirring units due to temperature rise.
The asphalt blue smoke contains a large amount of combustible substances, and because the basic component of the asphalt blue smoke is hydrocarbon compounds and contains oil particles and other combustible substances, the asphalt blue smoke can be ensured to burn through oxygen supply at a certain temperature. Tests prove that when the temperature exceeds 790 ℃, the burning time is more than 0.5s, and the hydrocarbon substances can be burnt completely under the condition of sufficient oxygen supply; other substances mixed in the asphalt blue smoke can be burnt completely when the temperature is higher than 900 ℃. The influence factors of asphalt blue smoke combustion mainly have two points, namely, the higher the concentration of asphalt blue smoke is, the more favorable the burning is; and the temperature and time of combustion are generally about 800-1000 ℃, and the combustion time is controlled to be about 0.5 s. If the temperature is insufficient and the time is insufficient, the incineration is incomplete; if the temperature is too high, part of asphalt blue smoke is carbonized into particles, and is discharged along with the smoke in a powder form, so that secondary pollution is generated.
The production process of the large-proportion hot recycled asphalt mixture specifically comprises the following steps:
step one, a waste crushing unit 100 crushes recovered asphalt pavement to obtain asphalt crushed aggregates;
step two, the waste screening unit 200 screens the asphalt crushed aggregates to obtain multi-stage asphalt crushed aggregates;
step three, the first stirring unit 301, the second stirring unit 302 and the third stirring unit 303 of the stirring unit respectively pretreat the multi-stage asphalt crushed aggregates to obtain hot asphalt crushed aggregates;
and step four, adding a regenerant into the hot asphalt crushed aggregates by a fourth stirring unit 304 of the stirring unit, and then carrying out mixed heating, stirring and regeneration to obtain a regenerated asphalt mixture.
The first stirring unit 301, the second stirring unit 302, the third stirring unit 303 and the fourth stirring unit 304 in the third step and the fourth step are respectively connected with the flue gas collecting unit 400, and the flue gas collecting unit 400 temporarily stores blue smoke generated by heating asphalt; the flue gas collecting unit 400 is connected with a flue gas integrating unit 500 sleeved on the fourth stirring unit 304, and the flue gas integrating unit 500 heats the fourth stirring unit 304 and combusts and purifies blue smoke generated by asphalt heating.
The central controller is used for controlling the operations of the waste crushing unit 100, the waste screening unit 200, the stirring unit, the fume collecting unit 400, and the fume integrating unit 500.
The coarse pitch crushed aggregates outlet of the waste material screening unit 200 is connected with the feed inlet of the first stirring unit 301, the medium pitch crushed aggregates outlet of the waste material screening unit 200 is connected with the feed inlet of the second stirring unit 302, and the fine pitch crushed aggregates outlet of the waste material screening unit 200 is connected with the feed inlet of the third stirring unit 303. The coarse asphalt crushed aggregates outlet, the medium asphalt crushed aggregates outlet and the fine asphalt crushed aggregates outlet of the waste material screening unit 200 are respectively provided with a control valve, the control valves are connected with the central controller, and the central controller controls the opening/closing of the corresponding control valves.
The first stirring unit 301 pretreats coarse asphalt particles, the second stirring unit 302 pretreats the coarse asphalt particles, and the third stirring unit 303 pretreats the fine asphalt particles to obtain hot asphalt particles of corresponding grades. The first stirring unit 301, the second stirring unit 302 and the third stirring unit 303 respectively comprise cylindrical shells with hollow interiors, the surfaces of the shells are respectively covered with heating devices, and the heating devices perform heating pretreatment on asphalt crushed aggregates in the first stirring unit 301, the second stirring unit 302 and the third stirring unit 303. The shell is coated with an insulating layer, and the heating device and the shell are coated by the insulating layer at the same time. The inner wall of the shell is respectively provided with a temperature monitoring device, the temperature monitoring device is preferably arranged at one end of the shell far away from the placing plane of the shell, so that the temperature monitoring device is prevented from contacting with heated asphalt particles, and the temperature monitoring device is influenced to monitor the internal temperature of the first stirring unit 301, the second stirring unit 302 or the third stirring unit 303. The temperature monitoring devices corresponding to the first stirring unit 301, the second stirring unit 302, and the third stirring unit 303 are respectively referred to as a first temperature monitoring device, a second temperature monitoring device, and a third temperature monitoring device, and the central controller receives temperature data monitored by the first temperature monitoring device, the second temperature monitoring device, and the third temperature monitoring device in real time.
The first stirring unit 301, the second stirring unit 302, and the third stirring unit 303 are respectively provided with a feeding port at one end far away from the placing plane, and are used for filling asphalt crushed aggregates of corresponding grades. The central shaft of the cylinder of the first stirring unit 301, the second stirring unit 302 and the third stirring unit 303 is provided with stirring rods, the stirring rods are respectively provided with a plurality of stirring blades, the stirring rods are driven to rotate under the action of a driving motor, and the stirring rods drive the stirring blades to stir and pretreat asphalt particles in the first stirring unit 301, the second stirring unit 302 or the third stirring unit 303.
The heating device, the temperature monitoring device and the driving motor are respectively connected with the central controller, and the central controller controls the driving motor to rotate and reads the temperature information of the temperature monitoring device to control the heating device.
The discharge ports of the first stirring unit 301, the second stirring unit 302, and the third stirring unit 303 are respectively connected with the feed inlet of the fourth stirring unit 304.
The fourth stirring unit 304 is integrally in a cylindrical structure, and comprises a stirring barrel 3041 and a stirring arc plate. The central shaft of the stirring tank 3041 is provided with a rotation shaft 3042, and the stirring arc plate is fixed on the rotation shaft 3042. At least one end of the rotation shaft 3042 protrudes from the stirring tank 3041, and is connected to a rotation motor, and the rotation motor drives the rotation shaft 3042 to rotate, so that the stirring arc plate fixed on the rotation shaft 3042 stirs the asphalt mixture in the fourth stirring unit 304.
The connection mode between the rotating shaft 3042 and the rotating motor may be a gear engagement connection, specifically, a first rotating gear is fixed at one end of the rotating shaft 3042 connected to the rotating motor, the rotating motor is connected to a second rotating gear, and the first rotating gear is engaged with the second rotating gear. The rotating motor is connected with the central controller, and the central controller controls the rotating speed and the steering of the rotating motor.
The number of the stirring arc plates is a positive integer greater than or equal to 2, and the stirring arc plates are sequentially and uniformly arranged on the rotating shaft 3042 in the vertical direction, namely, the interval distance between every two adjacent stirring arc plates in the vertical direction is equal. The stirring arc plates are sequentially arranged in the rotation direction of the rotation shaft 3042, that is, the interval angles of every two adjacent stirring arc plates in the rotation direction of the rotation shaft 3042 are equal. The stirring arc plate can be composed of an upper arc plate, a lower arc plate and a transverse plate, wherein the upper arc plate and the lower arc plate are respectively and fixedly connected with the rotating shaft 3042, the distance between the adjacent edges of the upper arc plate and the lower arc plate is equal to the length of the transverse plate, and the two ends of the transverse plate are respectively and fixedly connected with the upper arc plate and the lower arc plate. The arc directions of the upper arc plate and the lower arc plate are the same as the rotation direction of the rotation shaft 3042. The difference between the chord length of the upper arc plate and the chord length of the lower arc plate and the radius of the stirring barrel 3041 is more than or equal to 0cm and less than or equal to 1cm.
The rotating shaft 3042 is preferably a hollow structure, the rotating shaft 3042 is provided with a regenerant channel, and one end of the rotating shaft 3042, which is far from the rotating motor, protrudes from the stirring tank 3041 and is connected with a regenerant storage unit. In the fourth stirring unit 304, the highest position of the material is about two thirds of the height of the stirring tank 3041, and the part of the stirring shaft above the highest position of the material is provided with a regenerant adding port, and the regenerant is sprayed from the regenerant adding port along the regenerant channel and added into the material of the stirring tank 3041. The regenerant channel is connected with the regenerant storage unit through a rotary flange, and a pressure pump is arranged between the regenerant channel and the regenerant storage unit, so that the spraying pressure of the regenerant adding port is increased, and the spraying distance of the regenerant sprayed from the regenerant adding port is increased. The pressure pump is connected with the central controller, and the central controller controls the pressurizing force of the pressure pump.
The hot asphalt crushed aggregates of the grades corresponding to the first stirring unit 301, the second stirring unit 302 and the third stirring unit 303 respectively enter the fourth stirring unit 304 through the feed inlets corresponding to the fourth stirring unit 304, and meanwhile, the fourth stirring unit 304 is mixed, heated, stirred and regenerated after adding the regenerant, so that the regenerated asphalt mixture is obtained. The fourth stirring unit 304 is connected with a recycled asphalt storage unit, and the recycled asphalt mixture can be stored in the recycled asphalt storage unit to be reused.
As shown in fig. 2, the flue gas integration unit 500 is disposed on a side wall of the stirring tank 3041 of the fourth stirring unit 304, specifically, the flue gas integration unit 500 has a circular cylinder structure, and a central axis of the flue gas integration unit 500 coincides with a central axis of the fourth stirring unit 304, that is, the flue gas integration unit 500 surrounds the side wall of the stirring tank 3041 of the fourth stirring unit 304. The difference between the diameter of the inner wall of the flue gas integrating unit 500 and the diameter of the fourth stirring unit 304 is preferably greater than 0cm and less than or equal to 3cm.
The height of the stirring tank 3041 is greater than that of the flue gas integration unit 500, and at least one end of the stirring tank 3041 protrudes from the flue gas integration unit 500. The part of the stirring barrel 3041 protruding out of the smoke integration unit 500 is provided with a rotation tooth, the rotation tooth of the stirring barrel 3041 is meshed with a third rotation gear, the third rotation gear is connected with a rotation motor, and when the rotation motor rotates, the stirring barrel 3041 is driven to rotate through the third rotation gear. The rotating motor is connected with the central controller, and the central controller controls the rotating speed and the steering of the rotating motor. Preferably, the stirring tank 3041 is rotated opposite to the rotation shaft 3042.
The flue gas integration unit 500 may include a first cylindrical housing 501, a second cylindrical housing 502, a third annular housing 503, and a fourth annular housing 504. The first cylindrical shell 501 and the second cylindrical shell 502 form an annular side wall of the flue gas integration unit 500, and the heights of the first cylindrical shell 501 and the second cylindrical shell 502 are equal. The third annular housing 503 and the fourth annular housing 504 form two annular bottom surfaces of the flue gas integration unit 500. The inner diameters of the third annular housing 503 and the fourth annular housing 504 are equal to the diameter of the second cylindrical housing 502, and the outer diameters of the third annular housing 503 and the fourth annular housing 504 are equal to the diameter of the first cylindrical housing 501. The first cylindrical housing 501 and the second cylindrical housing 502 are respectively fixedly connected with the third annular housing 503 at the end far away from the placement plane, wherein the first cylindrical housing 501 and the third annular housing 503 are fixedly connected at the outer edge thereof, and the second cylindrical housing 502 and the third annular housing 503 are fixedly connected at the inner edge thereof. The first cylindrical shell 501 and the end, close to the placement plane, of the second cylindrical shell 502 are respectively and fixedly connected with the fourth annular shell 504, wherein the first cylindrical shell 501 is fixedly connected with the outer edge of the fourth annular shell 504, and the second cylindrical shell 502 is fixedly connected with the inner edge of the fourth annular shell 504.
The difference between the diameter of the second cylindrical housing 502 and the diameter of the fourth stirring unit 304 is preferably greater than 0cm and less than or equal to 3cm, and the smaller the distance therebetween, the better. The second cylindrical housing 502 may be provided with a heat transfer medium at a position opposite to the fourth stirring unit 304, the heat transfer medium being adjacent to or in contact with a sidewall of the stirring tank 3041 of the fourth stirring unit 304. The heat conducting medium can be high-temperature resistant heat conducting materials such as alumina ceramics, silicon carbide ceramics and the like.
The first stirring unit 301, the second stirring unit 302, the third stirring unit 303, and the fourth stirring unit 304 are respectively connected to the flue gas collecting unit 400 and then connected to the flue gas integrating unit 500. The smoke collection unit 400 collects and stores blue smoke in a concentrated manner.
The flue gas integration unit 500 is internally provided with a plurality of groups of combustion pipelines and flame monitors, wherein the combustion pipelines comprise flue gas channels, combustion-supporting channels and spare combustion channels, and the flame monitors are used for detecting the combustion temperature of the combustion pipelines, namely the flame temperature. The flue gas channel is used for introducing blue smoke collected by the flue gas collecting unit 400 into the flue gas integrating unit 500, the combustion-supporting channel is used for introducing air/oxygen into the flue gas integrating unit 500 so as to ensure sufficient combustion of spare combustion gas or blue smoke, and the spare combustion channel is used for introducing spare combustion gas into the flue gas integrating unit 500 so as to realize combustion of the blue smoke and ensure the temperature of the fourth stirring unit 304. The flame monitor is connected with the central controller and sends the flame temperature to the central controller in real time.
The third annular housing 503 of the flue gas integration unit 500 is provided with a plurality of flue gas inlets 505, a plurality of oxygen inlets 507 and a plurality of spare gas inlets 506. The flue gas inlets 505 are respectively connected with the flue gas collecting units 400, and the flue gas inlets 505 are respectively provided with a first control valve. The oxygen inlet 507 is connected with an oxygen storage unit or an air delivery pump respectively, and when the oxygen inlet 507 is connected with the oxygen storage unit, the oxygen inlet 507 is provided with a second control valve respectively. The fuel gas preparing inlets 506 are respectively connected with fuel gas preparing and provided with a third control valve, the fuel gas preparing inlets 506 are further provided with igniters, the igniters are used for igniting the fuel gas preparing, and the fuel gas preparing can be natural gas, alkane, alcohol and other combustible gases, and the fuel gas preparing is not particularly limited herein.
The central controller is respectively connected with the first control valve, the second control valve, the third control valve and the igniter, and controls the opening or closing of the first control valve, the second control valve and the third control valve and the ignition operation of the igniter.
The flue gas channel has a cylindrical structure, one end bottom surface of the flue gas channel is connected with the flue gas inlet 505, and the other end bottom surface of the flue gas channel is connected with the fourth annular shell 504. The flue gas passageway orientation the one side of agitator 3041 sets up the flue gas outlet, the flue gas passageway sets up the side radian of flue gas outlet is more than or equal to 60 degrees, is less than or equal to 90 degrees arbitrary radians.
The combustion-supporting channel is in a cylindrical structure, one end bottom surface of the combustion-supporting channel is connected with the oxygen inlet 507, and the other end bottom surface of the combustion-supporting channel is connected with the fourth annular shell 504. The side wall of the combustion-supporting channel is uniformly provided with combustion-supporting gas outlets in the 360-degree direction.
The back-up gas channel has a cylindrical structure, wherein one end bottom surface of the back-up gas channel is connected to the back-up gas inlet 506, and the other end bottom surface of the back-up gas channel is connected to the fourth annular housing 504. The side of the spare combustion channel facing the stirring barrel 3041 is provided with a spare combustion air outlet, and the side radian of the spare combustion channel is any radian which is more than 180 degrees and less than or equal to 270 degrees.
Here, 4 sets of combustion pipes are taken as an example for illustration:
at this time, the number of the flue gas channels is 4, the number of the combustion-supporting channels is 8, and the number of the spare combustion channels is 4.
After the two opposite smoke channels are connected, the intersection point of the two line segments is intersected with the central axis of the stirring barrel 3041 and is perpendicular to the central axis.
The 1 backup combustion channel and the 2 combustion supporting channels are arranged in combination, and the combination is called combustion supporting combination. The combustion-supporting combinations are arranged at intervals with the 4 flue gas channels, the combustion-supporting combinations are opposite to each other, and after two opposite combustion-supporting combinations are connected, the intersection points of two line segments are intersected with the central axis of the stirring barrel 3041 and are mutually perpendicular.
The structure of each combustion-supporting combination can be arranged according to the following structure, two sides of each spare combustion channel are respectively provided with a combustion-supporting channel, and the pipeline sections of the 1 spare combustion channel and the 2 combustion-supporting channels form a V shape. And 2 combustion-supporting channels are arranged at the edge positions of the spare combustion channels where the spare combustion gas outlets are arranged.
The fourth annular housing 504 is provided with an exhaust gas discharge port, the exhaust gas discharge port is connected to the exhaust gas purifying unit 600, and the exhaust gas purifying unit 600 purifies and discharges the gas after the combustion of the flue gas integrating unit 500. The exhaust gas purifying unit 600 may be an active coke adsorption tower, and is not particularly limited herein. An air quality monitor is arranged in a channel between the exhaust gas outlet and the exhaust gas purifying unit 600, and monitors the PM value of the exhaust gas discharged from the flue gas integrating unit 500 and sends the PM value of the exhaust gas discharged from the flue gas integrating unit 500 to the central controller.
The flue gas integration unit 500 further comprises a first pressure monitoring device, wherein the first pressure monitoring device is used for monitoring the pressure in the flue gas integration unit 500, so that potential safety hazards caused by overlarge pressure of the flue gas integration unit 500 are avoided. When the pressure data monitored by the first pressure monitoring device is greater than the third pressure threshold, the central controller stops the combustion heating and blue smoke combustion process of the smoke integration unit 500.
The smoke collecting unit 400 is provided with a second pressure monitoring device, and the second pressure monitoring device is used for monitoring the pressure in the smoke integrating unit 500, so that excessive blue smoke of the smoke collecting unit 400 is avoided, and the blue smoke of the smoke collecting unit 400 is insufficient when a combustion program of the blue smoke is started.
The inside fourth temperature monitoring device that is equipped with of agitator 3041, fourth temperature monitoring device with central controller is connected, fourth temperature monitoring device is in real time with the inside temperature of agitator 3041 is sent to central controller.
As shown in fig. 3, the central controller includes an analysis unit, a calculation unit, and a storage unit. The analysis unit is used for confirming the work of each component in the waste crushing unit 100, the waste screening unit 200, the stirring unit and the flue gas integration unit 500, so that the recovery of rock asphalt and the combustion purification of blue smoke are realized. And the calculation unit updates the lower temperature comparison table and the upper temperature comparison table according to the current weather and the temperature. The storage unit is used for storing key values of recycling rock asphalt and purifying blue smoke combustion.
The central controller also comprises a display unit, an input unit and a communication unit, wherein the display unit displays the monitoring information received by the central controller and the working condition of each component, the input unit is used for inputting control commands of each component or modifying the recovery of rock asphalt stored by the storage unit and the key numerical value for blue smoke combustion purification, and the communication unit is used for receiving the monitoring data sent by each component to the central controller or sending the control commands of each component to a target component.
The administrator inputs a start command to the input unit, and the waste crushing unit 100 crushes asphalt waste and then transfers it to the waste screening unit 200. The waste screening unit 200 screens the asphalt crushed aggregates output from the waste crushing unit 100, and conveys coarse asphalt crushed aggregates, medium asphalt crushed aggregates, and fine asphalt crushed aggregates to the first stirring unit 301, the second stirring unit 302, and the third stirring unit 303, respectively. The first stirring unit 301, the second stirring unit 302, and the third stirring unit 303 heat and stir the asphalt crushed aggregates of the corresponding level, and collect blue smoke generated when the asphalt crushed aggregates are heated to the smoke collecting unit 400. The storage unit stores a first temperature threshold section of the first stirring unit 301, the second stirring unit 302, and the third stirring unit 303. The first temperature monitoring device, the second temperature monitoring device and the third temperature monitoring device send temperature data monitored in real time to the central controller, and the analysis unit starts/stops the heating devices corresponding to the first stirring unit 301, the second stirring unit 302 and the third stirring unit 303 according to the monitored temperatures of the first temperature monitoring device, the second temperature monitoring device and the third temperature monitoring device. And when the monitored temperature is the lowest temperature of the first temperature threshold interval, starting the corresponding heating device, and when the monitored temperature is the highest temperature of the first temperature threshold interval, stopping the corresponding heating device. The first temperature threshold interval is preferably 70-100 ℃, which can be modified by the input unit.
The storage unit stores a second time threshold of stirring by the first stirring unit 301, the second stirring unit 302 and the third stirring unit 303, when the control valve of the discharge port corresponding to the waste screening unit 200 is closed, the timing is started, and when the second time threshold is reached, the first stirring unit 301, the second stirring unit 302 or the third stirring unit 303 finishes pretreatment of asphalt crushed aggregates, so as to obtain hot asphalt crushed aggregates.
After the first stirring unit 301, the second stirring unit 302 and the third stirring unit 303 complete pretreatment of the asphalt crushed aggregates, the central controller controls the hot asphalt crushed aggregates in the first stirring unit 301, the second stirring unit 302 and the third stirring unit 303 to be added into the fourth stirring unit 304, and the central controller controls the fourth stirring unit 304 to heat and stir the hot asphalt crushed aggregates and to add a regenerant into the hot asphalt crushed aggregates.
The storage unit stores the addition amount of the regenerant, an administrator can adjust the addition amount of the regenerant through the input unit, and the analysis unit determines the addition duration of the regenerant according to the addition amount of the regenerant, so as to determine the addition duration of the regenerant and the start/stop of the pressure pump. The central control communication unit sends a control command to the fourth stirring unit 304.
The central controller controls the fourth stirring unit 304 to heat and stir the hot asphalt particles, including controlling the combustion pipeline to introduce the spare gas and oxygen and igniting the spare gas through the igniter.
The storage unit stores an upward heating temperature comparison table, a fourth pressure threshold value and a fifth pressure threshold value of the flue gas collection unit 400, and the above data can be modified by the input unit. The temperature rise comparison table comprises temperature increment of the fourth temperature monitoring device when the unit duration of the spare gas is burnt and the temperature increment of the fourth temperature monitoring device when the unit duration of the blue smoke is burnt, wherein the temperature increment of the fourth temperature monitoring device corresponds to different temperatures in different days. The fourth pressure threshold is a pressure value corresponding to the lowest concentration of blue smoke in the smoke collection unit 400, and the fifth pressure threshold is a pressure warning value in the smoke collection unit 400, where the blue smoke in the smoke collection unit 400 needs to be burned within a sixth time threshold.
The storage unit stores a seventh temperature threshold interval of the fourth stirring unit 304, and when the monitored temperature of the fourth temperature monitoring device is the lowest temperature of the seventh temperature threshold interval, the second control valve and the third control valve are started, the igniter ignites the input spare gas, and the fourth stirring unit 304 is started to be heated. At this time, if the pressure value monitored by the second pressure monitoring device in the flue gas collecting unit 400 is greater than the fourth pressure threshold, blue smoke combustion may be started.
And when the temperature monitored by the fourth temperature monitoring device is the highest temperature in the seventh temperature threshold section, closing the second control valve and the third control valve. The seventh temperature threshold interval is preferably 140-180 ℃, which can be modified by the input unit.
The storage unit stores a cooling temperature comparison table: different temperatures in different weather correspond to the temperature at which the temperature in the fourth stirring unit 304 decreases in a unit time.
When the central controller receives that the pressure value monitored by the second pressure monitoring device is greater than the fourth pressure threshold, the central controller obtains the current weather and temperature, the analysis unit calculates the time required for the temperature in the fourth stirring unit 304 to drop to the lowest temperature in the seventh temperature threshold interval according to the current weather and the temperature corresponding to the temperature in the fourth stirring unit 304 dropping in unit time, and then the analysis unit obtains the pressure change curve of the second pressure monitoring device which is the current nearest, estimates whether the pressure value in the flue gas collection unit 400 is less than the fifth pressure threshold in the time required for the temperature in the fourth stirring unit 304 to drop to the lowest temperature in the seventh temperature threshold interval, so as to avoid overlarge pressure in the flue gas collection unit 400 caused by waiting for the fourth stirring unit 304 to reach the lowest temperature in the seventh temperature threshold interval.
If the pressure value in the flue gas collection unit 400 is greater than or equal to the fifth pressure threshold within the time required for the temperature in the fourth stirring unit 304 to drop to the lowest temperature in the seventh temperature threshold interval, the analysis unit determines, according to the pressure change curve of the second pressure monitoring device that is currently closest, that the pressure value in the flue gas collection unit 400 is equal to the fifth pressure threshold. And then determining that the temperature in the fourth stirring unit 304, namely the temperature value monitored by the fourth temperature monitoring device, when the pressure value in the flue gas collection unit 400 is equal to the fifth pressure threshold value according to the time and the temperature in the fourth stirring unit 304, which corresponds to the temperature in which the temperature in the fourth stirring unit 304 is reduced in unit time. The analysis unit is configured to read the temperature increment of the fourth temperature monitoring device for a unit duration of blue smoke combustion, and determine whether the temperature in the fourth stirring unit 304 exceeds the highest temperature in the seventh temperature threshold interval when the pressure value in the smoke collection unit 400 is equal to the fifth pressure threshold.
If the temperature in the fourth stirring unit 304 exceeds the highest temperature in the seventh temperature threshold interval, the flue gas collection unit 400 is connected to a standby collection unit, so as to ensure that the pressure value in the flue gas collection unit 400 is smaller than the fifth pressure threshold.
If the temperature in the fourth stirring unit 304 is less than or equal to the highest temperature in the seventh temperature threshold section, the analysis unit confirms that the pressure value in the flue gas collection unit 400 is equal to the fifth pressure threshold, and starts blue smoke combustion.
When blue smoke combustion is started, the central controller receives the real-time flame temperature monitored by the flame monitor in real time and the PM value of the exhaust gas monitored by the air quality monitor. And when the PM value of the exhaust gas is larger than or equal to an eighth threshold value, the analysis unit reads the real-time flame temperature and judges the reason of the increase of the PM value. The eighth threshold value is a preset value, which can be input/modified through the input unit, and stored in the storage unit, and refers to a PM value standard value, and when the PM value of the exhaust gas is greater than or equal to the eighth threshold value, the exhaust gas is abnormal.
The memory unit stores a ninth flame temperature threshold, preferably 790 ℃, which can be modified by the input unit.
The analysis unit determines that the cause of the increase in the PM value is specifically as follows,
when the real-time flame temperature is greater than or equal to the ninth flame temperature threshold, the analysis unit determines that the oxygen is insufficient, and at the moment, the central controller sends a pressurizing command to the second valve to increase the ventilation quantity of oxygen/air. The second control valve includes a second pressurization pump that is activated when the central controller sends a pressurization command to the second valve.
When the real-time flame temperature is smaller than the ninth flame temperature threshold, the analysis unit determines that the combustion temperature is too low, and at the moment, the central controller respectively sends a pressurizing command to the second valve and the third valve, and the inflow amount of the spare fuel gas and the oxygen/air is increased, so that the combustion temperature is increased. The third control valve includes a third booster pump that is activated when the central controller sends a pressurization command to the third valve.
The calculation unit updates the lower temperature comparison table and the upper temperature comparison table, specifically as follows,
the calculating unit updates the cooling temperature comparison table according to the current weather and temperature and the current temperature of the fourth stirring unit 304 in which the temperature is reduced in unit time.
The central controller acquires current weather data, calculates the temperature change of the current weather data corresponding to the temperature monitored by the fourth temperature monitoring device in real time, and when the current weather data comprises the current weather data, the temperature of the fourth stirring unit 304 is reduced in unit time. The weather data includes at least weather and temperature.
And the calculation unit updates the rising temperature comparison table according to the current weather and temperature, the temperature increment of the fourth temperature monitoring device in the current standby gas combustion unit time and the temperature increment of the fourth temperature monitoring device in the blue smoke combustion unit time.
When the fourth stirring unit 304 is started to heat or burn blue smoke, the central controller acquires current weather data, and calculates the temperature change of the current weather data corresponding to the temperature change monitored by the fourth temperature monitoring device in real time: when weather data is present, preparing the temperature increment of the fourth temperature monitoring device for the unit duration of gas combustion; and the temperature increment of the fourth temperature monitoring device is carried out on the blue smoke combustion unit time.
The production device and the process for the large-proportion hot-recycled asphalt mixture collect and burn and purify blue smoke generated during asphalt heating and recycling, reduce the cost of blue smoke purification, and improve the recycling proportion of the hot asphalt mixture, thereby greatly reducing the production cost of the asphalt mixture. In addition, when the asphalt mixture is thermally regenerated, the temperature of the fourth stirring unit 304 is accurately controlled to change, so that the influence of temperature abnormality on the regeneration quality of the asphalt mixture is avoided. Meanwhile, the purified air is monitored in real time, the combustion temperature of the blue smoke is adjusted in time, the quality of exhaust gas after the blue smoke is combusted and purified is guaranteed, and air pollution caused by excessive or insufficient combustion of the blue smoke is avoided.
The foregoing is a description of a preferred embodiment of the invention to assist those skilled in the art in more fully understanding the invention. However, these examples are merely illustrative, and the present invention is not to be construed as being limited to the descriptions of these examples. It should be understood that, to those skilled in the art to which the present invention pertains, several simple deductions and changes can be made without departing from the inventive concept, and these should be considered as falling within the scope of the present invention.
Claims (6)
1. The production device of the large-proportion hot-recycled asphalt mixture comprises a waste crushing unit, a waste screening unit and a stirring unit which are connected in sequence, and is characterized in that,
the waste crushing unit is used for crushing the recycled asphalt pavement to obtain asphalt crushed aggregates; the waste screening unit screens the asphalt crushed aggregates to obtain multi-stage asphalt crushed aggregates; the first stirring unit, the second stirring unit and the third stirring unit of the stirring unit respectively pretreat the multi-stage asphalt crushed aggregates to obtain hot asphalt crushed aggregates; the fourth stirring unit of the stirring unit adds the regenerant into the hot asphalt crushed aggregates, and then carries out mixed heating, stirring and regeneration to obtain a regenerated asphalt mixture;
the device also comprises a smoke collection unit, a smoke integration unit and a central controller, wherein the central controller is respectively connected with the waste crushing unit, the waste screening unit, the stirring unit, the smoke collection unit and the smoke integration unit;
the first stirring unit, the second stirring unit, the third stirring unit and the fourth stirring unit are respectively connected with a smoke collecting unit, and the smoke collecting unit temporarily stores blue smoke generated by heating asphalt; the flue gas collecting unit is connected with a flue gas integrating unit sleeved on the fourth stirring unit, and the flue gas integrating unit heats the fourth stirring unit and combusts and purifies blue smoke generated by asphalt heating;
The storage unit stores a seventh temperature threshold interval of the fourth stirring unit, a fourth pressure threshold of the flue gas collection unit and a fifth pressure threshold, wherein the seventh temperature threshold interval is 140-180 ℃, the fourth pressure threshold is a pressure value corresponding to the lowest concentration of blue smoke combustion in the flue gas collection unit, and the fifth pressure threshold is a pressure warning value in the flue gas collection unit;
when the temperature monitored by the fourth temperature monitoring device in the fourth stirring unit is the lowest temperature of the seventh temperature threshold interval, heating the fourth stirring unit; stopping heating the fourth stirring unit when the fourth temperature monitoring device monitors that the temperature is the highest temperature of the seventh temperature threshold section;
the central controller comprises an analysis unit, after the pressure value monitored by the second pressure monitoring device in the flue gas collection unit is larger than a fourth pressure threshold value, the central controller acquires the current weather and the temperature, and the analysis unit estimates whether the pressure value in the flue gas collection unit is smaller than a fifth pressure threshold value or not in the time required for the temperature in the fourth stirring unit to be reduced to the lowest temperature in a seventh temperature threshold value interval according to a cooling temperature comparison table stored in a storage unit of the central controller and a pressure change curve of the second pressure monitoring device;
When the temperature in the fourth stirring unit is reduced to the lowest temperature in the seventh temperature threshold interval, and the pressure value in the flue gas collection unit is larger than or equal to the fifth pressure threshold, the analysis unit confirms whether the temperature in the fourth stirring unit exceeds the highest temperature in the seventh temperature threshold interval by burning blue smoke according to the pressure change curve of the second pressure monitoring device, the upper temperature rise comparison table and the lower temperature fall comparison table stored in the storage unit;
the temperature rise comparison table comprises temperature increment of a fourth temperature monitoring device when the unit duration of the spare gas is burnt and the temperature increment of the fourth temperature monitoring device when the unit duration of the blue smoke is burnt, wherein the temperature increment corresponds to different temperatures in different days; the cooling temperature comparison table comprises temperatures in which the temperatures in the fourth stirring unit are reduced in unit time corresponding to different temperatures in different weather;
when the temperature in the fourth stirring unit exceeds the highest temperature in the seventh temperature threshold interval, the flue gas collecting unit is connected with a standby collecting unit, so that the pressure value in the flue gas collecting unit is smaller than a fifth pressure threshold;
And when the temperature in the fourth stirring unit is smaller than or equal to the highest temperature in the seventh temperature threshold interval, the analysis unit confirms that the pressure value in the smoke collection unit is equal to a fifth pressure threshold, and blue smoke combustion is started.
2. The apparatus for producing a high proportion of hot recycled asphalt mixture according to claim 1, wherein the fourth stirring unit has a cylindrical structure as a whole, the flue gas integrating unit has a circular cylinder structure, and a central axis of the flue gas integrating unit coincides with a central axis of the fourth stirring unit;
the diameter difference between the inner ring diameter of the smoke integration unit and the diameter of the fourth stirring unit is more than 0cm and less than or equal to 3cm, and a heat conducting medium is arranged between the smoke integration unit and the fourth stirring unit.
3. The device for producing the large-proportion heat regenerated asphalt mixture according to claim 2, wherein a plurality of groups of combustion pipelines and flame monitors are arranged in the flue gas integration unit,
the combustion pipeline comprises a flue gas channel, a combustion-supporting channel and a spare combustion channel, the flue gas channel is used for leading blue smoke collected by the flue gas collecting unit into the flue gas integrating unit, the combustion-supporting channel is used for leading air/oxygen into the flue gas integrating unit, and the spare combustion channel is used for leading spare combustion gas into the flue gas integrating unit so as to realize the combustion of the blue smoke and the heating of the fourth stirring unit; the flame monitor detects the flame temperature and sends the flame temperature to the central controller in real time.
4. The apparatus for producing a high proportion of thermally regenerated asphalt mixture according to claim 3, wherein the calculation unit of the central controller updates the lower temperature and upper temperature comparison tables according to the current weather and temperature,
the calculation unit updates the cooling temperature comparison table according to the current weather and temperature and the current temperature of the fourth stirring unit in which the temperature is reduced in unit time;
and the calculation unit updates the rising temperature comparison table according to the current weather and temperature, the temperature increment of the fourth temperature monitoring device in the unit time of the current standby gas combustion and the temperature increment of the fourth temperature monitoring device in the unit time of the blue smoke combustion.
5. The apparatus for producing a large-scale heat regenerated asphalt mixture according to claim 3, wherein the flue gas integrating unit is provided with an exhaust gas discharge port, the exhaust gas discharge port is connected with an exhaust gas purifying unit, and the exhaust gas purifying unit purifies and discharges the gas after the combustion of the flue gas integrating unit;
when blue smoke combustion is started, the central controller receives PM values of exhaust gases monitored by an air quality monitor arranged in a channel between the exhaust gas discharge port and the exhaust gas purification unit in real time, when the PM values of the exhaust gases are larger than or equal to an eighth threshold value, the analysis unit reads real-time flame temperature, and after judging the reason for increasing the PM values, the inflow amount or the combustion temperature of oxygen/air is adjusted;
The eighth threshold value is a preset value and stored in the storage unit, and is a standard value of the PM value of the exhaust gas, and when the PM value of the exhaust gas is equal to or greater than the eighth threshold value, the exhaust gas is abnormal.
6. The production process of the large-proportion heat-regenerated asphalt mixture, which is applied to the production device of the large-proportion heat-regenerated asphalt mixture as claimed in any one of claims 1 to 5, is characterized by comprising the following steps in detail,
step one, crushing the recycled asphalt pavement by a waste crushing unit to obtain asphalt crushed aggregates;
step two, the asphalt crushed aggregates are screened by a waste screening unit to obtain multi-stage asphalt crushed aggregates;
step three, the first stirring unit, the second stirring unit and the third stirring unit of the stirring unit respectively pretreat the multi-stage asphalt crushed aggregates to obtain hot asphalt crushed aggregates;
step four, adding a regenerant into the hot asphalt crushed aggregates by a fourth stirring unit of the stirring unit, and then carrying out mixed heating, stirring and regeneration to obtain a regenerated asphalt mixture;
the first stirring unit, the second stirring unit, the third stirring unit and the fourth stirring unit in the third step and the fourth step are respectively connected with a smoke collecting unit, and the smoke collecting unit temporarily stores blue smoke generated by heating asphalt; the flue gas collection unit is connected with a flue gas integration unit sleeved on the fourth stirring unit, and the flue gas integration unit heats the fourth stirring unit and combusts and purifies blue smoke generated by asphalt heating.
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