Asphalt mixture stirring production equipment with heat energy recovery and production method

Abstract

The present application relates to the field of asphalt mixture production equipment, and discloses an asphalt mixture stirring production equipment with heat energy recovery and a production method, the production equipment comprises a regenerated drying roller, a primary drying roller, a dust removal system, a preheating system, a cyclone dust collector and an incinerator; the gas outlet end of the regenerated drying roller is connected with the gas inlet end of the cyclone dust collector, the gas outlet end of the cyclone dust collector is connected with the incinerator, the incinerator is connected with the gas inlet end of the preheating system; the gas outlet end of the preheating system and the gas outlet end of the primary drying roller are both connected with the dust removal system, and the discharge end of the preheating system is connected with the feeding end of the primary drying roller.The present application has the following advantages: the high-temperature tail gas heat energy discharged from the incinerator can be converted into preheating energy of the primary aggregate, so that the tail gas pollution problem is solved thoroughly, the energy recycling is realized, and the equipment energy consumption and operation cost are effectively reduced.

Description

A heat recovery asphalt mixture mixing and production equipment and method Technical Field

[0001] This invention relates to the field of asphalt mixture production equipment technology, specifically to an asphalt mixture mixing and production equipment and method with heat recovery. Background Technology

[0002] In the actual production operation of asphalt mixing equipment, the recycled drying drum, as the core device for processing recycled materials, continuously emits exhaust gas containing high concentrations of asphalt fumes during the drying and heating process. This exhaust gas contains various harmful components such as benzo[a]pyrene and polycyclic aromatic hydrocarbons. If directly emitted into the atmosphere, it will not only severely damage the regional air quality but also cause long-term harm to the surrounding ecological environment and human health.

[0003] To address exhaust gas pollution, the industry currently employs two main treatment methods, both of which have unavoidable drawbacks. The first is the "incineration method," which involves introducing exhaust gas into an incinerator through pipelines, utilizing the high-temperature environment of 800℃-1000℃ to fully combust and decompose the harmful components in the asphalt fumes, ultimately achieving compliant emissions. However, the 800℃-1000℃ high-temperature exhaust gas generated during incineration is not effectively utilized and is directly discharged into the atmosphere through chimneys, resulting in a significant loss of heat energy and severe energy waste. Simultaneously, the virgin drying drum relies on burners to continuously burn large amounts of diesel or heavy oil when heating and drying the virgin aggregates. The average daily fuel consumption of a single unit can reach several tons, resulting in an energy utilization rate of less than 30% and a substantial increase in equipment operating costs.

[0004] The second method is the "baghouse dust collector," which introduces the exhaust gas into a baghouse dust collector, using the filter bags to remove coarse particulate impurities. However, this method only solves the particulate pollution problem and cannot address the pungent odor unique to asphalt fumes. The emitted exhaust gas still has a noticeable odor, causing sensory pollution to the surrounding environment. More importantly, asphalt fumes are highly adhesive. After the equipment has been running continuously for 48-72 hours, the adhesive substance gradually adheres to the surface of the filter bags, causing them to become clogged, reducing air permeability, and ultimately rendering the dust collector ineffective. At this point, the machine must be shut down and all filter bags replaced, with a single replacement costing tens of thousands of yuan and taking 2-3 hours. This not only increases equipment maintenance costs but also severely impacts production schedules. Summary of the Invention

[0005] In view of the shortcomings of existing incineration methods, such as "waste of heat energy and high operating costs", and existing bag filter dust collection methods, such as "difficult to remove odor and high maintenance costs", this invention provides an asphalt mixture mixing production equipment and production method with heat recovery, which can completely solve the problem of exhaust gas pollution while realizing the recycling of energy, thereby effectively reducing equipment energy consumption and operating costs.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An asphalt mixture mixing and production equipment with heat recovery includes a recycled drying drum, a primary drying drum, a dust removal system, a preheating system, a cyclone dust collector, and an incinerator. The outlet of the recycled drying drum is connected to the inlet of the cyclone dust collector, the outlet of the cyclone dust collector is connected to the incinerator, and the incinerator is connected to the inlet of the preheating system. The outlets of the preheating system and the primary drying drum are both connected to the dust removal system, and the discharge end of the preheating system is connected to the feed end of the primary drying drum.

[0008] Furthermore, the preheating system includes a preheating drum, a preheating elevator, a preheating feed belt conveyor, and a raw cold material silo. Several raw cold material silos are located above the preheating feed belt conveyor. One end of the preheating feed belt conveyor is connected to the lower end of the preheating elevator, the upper end of the preheating elevator is connected to the feed end of the preheating drum, the discharge end of the preheating drum is connected to the feed end of the raw drying drum, the air inlet end of the preheating drum is connected to the incinerator, and the air outlet end of the preheating drum is connected to the dust removal system. The preheating drum is a counter-current drum. A first temperature sensor is installed at the air inlet end of the preheating drum, and a first regulating damper is also provided at the air inlet end of the preheating drum. A second temperature sensor is installed at the discharge end of the preheating drum.

[0009] Furthermore, it also includes a steering belt conveyor and a primary feed belt conveyor; one end of the primary feed belt conveyor is connected to the feed end of the primary drying drum, the steering belt conveyor is located between the other end of the preheating feed belt conveyor and the other end of the primary feed belt conveyor, and the primary drying drum is a counter-current drum, and the preheating feed belt conveyor is a belt conveyor with forward and reverse functions.

[0010] Furthermore, the preheating drum has a guiding section, a lifting and heating section, and a discharging section; the inner wall of the guiding section is provided with a first guiding plate group, which includes a plurality of first guiding plates distributed along the circumference; the inner wall of the lifting and heating section is provided with a plurality of second guiding plate groups and a plurality of radial lifting and lifting plate groups along the axial direction, the second guiding plate groups including a plurality of second guiding plates distributed along the circumference, and the radial lifting and lifting plate groups including a plurality of radial lifting and lifting plates distributed along the circumference, and the second guiding plate groups and the radial lifting and lifting plate groups are alternately distributed; the inner wall of the discharging section is provided with at least one deflecting plate group, which includes a plurality of deflecting plates distributed along the circumference.

[0011] Furthermore, the first guide plate is a continuous spiral blade with a large inclination angle and a small pitch. The inclination angle of the continuous spiral blade is 35°-40°, and the pitch of the continuous spiral blade is 0.8-1.0 times the inner diameter of the preheating drum.

[0012] The second guide plate is an inclined bending plate, and the second guide plates of each second guide plate group together form a discontinuous intermittent spiral guide channel.

[0013] The feeding plate is a straight plate or a slightly curved plate with a certain width. One end of the feeding plate is welded to the inner wall of the discharge section, and the other end of the feeding plate extends towards the center of the preheating drum to form a cantilever beam structure. Each feeding plate is inclined at a certain angle towards the discharge end of the preheating drum.

[0014] Furthermore, it also includes a return air duct; the discharge end of the regenerated drying drum is connected to a hot air furnace, the output end of the cyclone dust collector is connected to the hot air furnace through the return air duct, and the regenerated drying drum is a counter-current drum.

[0015] Furthermore, it also includes a primary elevator, a regenerated elevator, a regenerated feed belt conveyor, a regenerated cold silo, and a mixing device; the discharge end of the primary drying drum is connected to the lower end of the primary elevator, the upper end of the primary elevator is connected to the mixing device, and the cyclone dust collector is connected to the primary elevator; the upper end of the regenerated elevator is connected to the feed end of the regenerated drying drum, the discharge end of the regenerated drying drum is connected to the mixing device, the regenerated feed belt conveyor is connected to the lower end of the regenerated elevator, and the regenerated cold silo is located above the regenerated feed belt conveyor.

[0016] Secondly, a production method for an asphalt mixture mixing production equipment with heat recovery, the production method comprising:

[0017] The asphalt-containing fumes discharged from the regenerated drying drum are sent to a cyclone dust collector for cyclone dust removal. The asphalt-containing fumes after dust removal are then sent to an incinerator for complete combustion to obtain high-temperature exhaust gas.

[0018] The raw aggregate is transported by a preheating system, and the high-temperature exhaust gas after combustion is input into the preheating system to exchange heat between the raw aggregate and the high-temperature exhaust gas. The raw aggregate and the high-temperature exhaust gas are transported in opposite directions, thereby preheating the raw aggregate from room temperature to a set temperature range. The preheating system outputs the preheated raw aggregate to the raw drying drum, and at the same time outputs the exhaust gas after heat exchange and the exhaust gas generated by the raw drying drum to the dust removal system for dust removal treatment.

[0019] Furthermore, the production method also includes:

[0020] The particulate matter generated by the cyclone dust collector is transported to the primary elevator, so that the particulate matter generated by the dust collector is mixed with the primary aggregate and enters the subsequent processing process.

[0021] The temperature of the high-temperature exhaust gas is monitored in real time by a first temperature sensor located at the air inlet of the preheating drum. When the temperature of the high-temperature exhaust gas is higher than the first preset temperature value, the opening of the first regulating damper is reduced. When the temperature of the high-temperature exhaust gas is lower than the second preset temperature value, the opening of the first regulating damper is increased. When the temperature of the high-temperature exhaust gas is less than or equal to the first preset temperature value and greater than or equal to the second preset temperature value, the opening of the first regulating damper is kept constant.

[0022] The temperature of the preheated raw aggregate is monitored in real time by a second temperature sensor located at the discharge end of the preheating drum. When the temperature of the raw aggregate reaches the preset first temperature range, the burner of the raw drying drum is controlled to reduce the fuel supply. When the temperature of the raw aggregate is lower than the preset second temperature range, the burner of the raw drying drum is controlled to increase the fuel supply. When the temperature of the raw aggregate is not at the preset first temperature range but not lower than the preset second temperature range, the burner of the raw drying drum is controlled to maintain a constant fuel supply.

[0023] Furthermore, the production method also includes:

[0024] When only virgin aggregate is produced and there is no need to treat asphalt-containing exhaust gas, the preheated feed conveyor is controlled to start the reverse mode. The virgin aggregate is transported to the virgin drying drum by the steering conveyor and the virgin feed conveyor, and the exhaust gas generated by the virgin drying drum is output to the dust removal system for dust removal treatment.

[0025] By adopting the above-described technical solution of the present invention, at least the following beneficial effects are achieved:

[0026] 1. It can convert the high-temperature exhaust gas heat energy discharged from the incinerator into the preheating energy of the raw aggregate, thereby completely solving the exhaust gas pollution problem and realizing the recycling of energy, effectively reducing equipment energy consumption and operating costs.

[0027] 2. Cyclone dust collectors can effectively remove coarse particulate impurities from regeneration exhaust gas, eliminating the need for filter bags and preventing coarse particles from entering subsequent equipment such as fans and incinerators along with the exhaust gas. This protects equipment such as fans and incinerators, reducing the risk of equipment failure and maintenance frequency.

[0028] 3. The optimized incinerator can completely decompose the harmful components and odors in asphalt fumes, solving the problem that bag filters cannot completely eliminate odors and fundamentally avoiding the problem of filter bag clogging and failure caused by the stickiness of asphalt fumes; it eliminates the need for heat exchangers that are required in traditional incinerators, thereby directly saving the purchase and installation costs of heat exchangers, reducing the equipment space occupied by heat exchangers, and significantly reducing the overall manufacturing cost and subsequent maintenance cost of the incinerator.

[0029] 4. By combining a cyclone dust collector with an optimized incinerator and a preheating system, not only can heat energy be recovered, but the purchase cost of a bag filter and the cost of frequent filter bag replacements and downtime losses during replacement can also be directly eliminated, thereby significantly reducing the maintenance cost throughout the equipment's life cycle.

[0030] 5. By setting up the first and second temperature sensors, automated control functions can be realized, thereby ensuring heat exchange efficiency and production stability.

[0031] 6. It can effectively switch between production modes with and without recycled materials without stopping the machine. The entire mode switching process can be carried out with one-click operation through the control panel. The switching time is short and can ensure continuous and stable production. Attached Figure Description

[0032] Figure 1 is an overall structural diagram of an asphalt mixture mixing and production equipment with heat recovery according to the present invention;

[0033] Figure 2 is a diagram of the internal structure of the preheating drum in this invention;

[0034] Figure 3 is a cross-sectional view along the AA direction in Figure 2;

[0035] Figure 4 is a cross-sectional view along the BB direction in Figure 2;

[0036] Figure 5 is a cross-sectional view along the CC direction in Figure 2.

[0037] Figure label:

[0038] Production equipment 100;

[0039] Regenerated drying drum 1, hot air furnace 11;

[0040] Original drying drum 2, burner 21;

[0041] Dust removal system 3;

[0042] Preheating drum 41, guiding section 411, lifting and heating section 412, discharging section 413, preheating elevator 42, preheating feed belt conveyor 43, raw cold material bin 44, first regulating damper 45, first guide plate group 46, first guide plate 461, second guide plate group 47, second guide plate 471, radial lifting lifting plate group 48, radial lifting lifting plate 481, material pushing plate group 49, material pushing plate 491;

[0043] Cyclone dust collector 5;

[0044] Incinerator 6;

[0045] Steering belt conveyor 71, original feed belt conveyor 72, second regulating damper 73, third regulating damper 74;

[0046] Return air duct 8;

[0047] 91. Primary hoist, 92. Recycled hoist, 93. Recycled feed belt conveyor, 94. Recycled cold material silo, 951. Mixing cylinder, 952. Aggregate weighing scale, 953. Powder weighing scale, 954. Asphalt weighing scale, 955. Recycled material weighing scale, 956. Vibrating screen, 957. Recycled material temporary storage silo. Detailed Implementation

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Example 1

[0050] Please refer to Figures 1-5. This invention provides an asphalt mixture mixing and production equipment 100 with heat recovery. The equipment 100 includes a recycled drying drum 1, a primary drying drum 2, a dust removal system 3, a preheating system, a cyclone dust collector 5, and an incinerator 6. The outlet of the recycled drying drum 1 is connected to the inlet of the cyclone dust collector 5 to allow the asphalt-containing exhaust gas discharged from the recycled drying drum 1 to be fed into the cyclone dust collector 5 for cyclone dust removal. The outlet of the cyclone dust collector 5 is connected to the incinerator 6, and the incinerator 6 is connected to the inlet of the preheating system to facilitate the transportation of the dust-removed asphalt-containing exhaust gas. The asphalt fumes are fully combusted in the incinerator 6, decomposing harmful components and odors. The high-temperature exhaust gas is then sent to a preheating system to preheat the virgin aggregate, thus recovering heat energy. The exhaust outlets of both the preheating system and the virgin drying drum 2 are connected to a dust removal system 3 to remove dust from the exhaust gases, ensuring they meet environmental protection requirements. The discharge end of the preheating system is connected to the feed end of the virgin drying drum 2, allowing the preheated aggregate to be transported to the drum for further heating and drying. It should be noted that the incinerator 6 in this invention eliminates the need for a heat exchanger, a traditional requirement in incinerators, thus saving on purchase and installation costs and reducing the space occupied by the heat exchanger.

[0051] In some embodiments of the present invention, the preheating system includes a preheating drum 41, a preheating elevator 42, a preheating feed conveyor 43, and a raw cold aggregate bin 44; a plurality of raw cold aggregate bins 44 are provided above the preheating feed conveyor 43, so that each raw cold aggregate bin 44 can transport raw aggregate to the preheating feed conveyor 43 according to production needs; one end of the preheating feed conveyor 43 is connected to the lower end of the preheating elevator 42, and the upper end of the preheating elevator 42 is connected to the feed end of the preheating drum 41, so as to utilize the preheating elevator 42 to realize The raw aggregate is now conveyed into the preheating drum 41 for preheating. The discharge end of the preheating drum 41 is connected to the feed end of the raw drying drum 2 to convey the preheated raw aggregate to the raw drying drum 2. The air inlet end of the preheating drum 41 is connected to the incinerator 6, and the air outlet end of the preheating drum 41 is connected to the dust removal system 3. The preheating drum 41 is a counter-current drum, that is, in the preheating drum 41, the conveying direction of the raw aggregate is opposite to the conveying direction of the high-temperature exhaust gas after combustion, so as to ensure that the raw aggregate can better exchange heat with the high-temperature exhaust gas.

[0052] The preheating drum 41 is equipped with a first temperature sensor (not shown) at its air inlet end, and a first regulating damper 45 is also provided at the air inlet end of the preheating drum 41. During operation, the opening of the first regulating damper 45 can be controlled according to the temperature of the high-temperature exhaust gas monitored by the first temperature sensor. The preheating drum 41 is equipped with a second temperature sensor (not shown) at its discharge end. During operation, the burner 21 of the raw drying drum 2 can be controlled according to the temperature of the preheated raw aggregate monitored by the second temperature sensor.

[0053] This invention, based on the fundamental framework of a traditional production equipment consisting of a regenerating drying drum 1, a primary drying drum 2, and an incinerator 6, focuses on the following improvements: 1. A preheating system is added to recover and utilize the heat energy of the high-temperature exhaust gas; 2. The structure of the incinerator 6 is optimized, eliminating the need for a heat exchanger, a requirement in traditional incinerators; 3. A cyclone dust collector 5 is added between the regenerating drying drum 1 and the incinerator 6, replacing the traditional belt dust collector with the cyclone dust collector 5, the optimized incinerator 6, and the preheating system. Therefore, by adopting the above-mentioned technical solution of this invention, at least the following beneficial effects are achieved:

[0054] 1. It can convert the high-temperature exhaust gas heat energy discharged from the incinerator 6 into the preheating energy of the raw aggregate, thereby completely solving the exhaust gas pollution problem and realizing the recycling of energy, effectively reducing equipment energy consumption and operating costs.

[0055] 2. The cyclone dust collector 5 can effectively remove coarse particulate impurities from the regeneration exhaust gas (dust removal efficiency ≥95%), so that the regeneration exhaust gas no longer needs to rely on filter bags for filtration, and can also prevent coarse particles from entering subsequent equipment such as fans and incinerators along with the regeneration exhaust gas. This can protect equipment such as fans and incinerators, reduce the risk of equipment failure and maintenance frequency.

[0056] 3. The optimized incinerator 6 can completely decompose the harmful components and odors in the asphalt fumes, solving the problem that baghouse dust collectors cannot completely eliminate odors, and fundamentally avoiding the problem of filter bag clogging and failure caused by the stickiness of asphalt fumes; it eliminates the need for heat exchangers that are required in traditional incinerators, thereby directly saving the purchase and installation costs of heat exchangers, reducing the equipment space occupied by heat exchangers, and significantly reducing the overall manufacturing cost and subsequent maintenance cost of incinerator 6.

[0057] 4. Through the combined design of cyclone dust collector 5 + optimized incinerator 6 + preheating system, in addition to realizing heat energy recovery, it can also directly save the purchase cost of bag dust collector, as well as the cost of frequent replacement of filter bags and the downtime losses caused during the replacement process, thereby significantly reducing the maintenance cost of the equipment throughout its entire life cycle.

[0058] 5. By setting up the first and second temperature sensors, automated control functions can be realized, thereby ensuring heat exchange efficiency and production stability.

[0059] In some embodiments of the present invention, the production equipment 100 further includes a steering belt conveyor 71 and a primary feed belt conveyor 72; one end of the primary feed belt conveyor 72 is connected to the feed end of the primary drying drum 2. In specific implementations of the present invention, the discharge end of the preheating drum 41 can be connected to the primary feed belt conveyor 72. During operation, the preheating drum 41 conveys the preheated primary aggregate to the primary feed belt conveyor 72, and then the primary feed belt conveyor 72 conveys the preheated primary aggregate to the primary drying drum 2; the steering belt conveyor 71 is located between the other end of the preheating feed belt conveyor 43 and the other end of the primary feed belt conveyor 72, and the primary drying drum 2 is a counter-flow drum, that is, in the primary drying drum 2, the conveying direction of the primary aggregate is opposite to that of the heating airflow; the preheating feed belt conveyor 43 is a belt conveyor with forward and reverse functions, that is, the preheating feed belt conveyor 43 is equipped with a bidirectional drive motor and has two operating modes, forward and reverse, so as to quickly switch according to production needs. In a specific implementation of the present invention, anti-slip stripes (not shown) can be added to the surface of the belt of the steering belt conveyor 71 to ensure that the material will not slip during the steering and conveying process; the conveying speed of the original feeding belt conveyor 72 is matched with the feeding speed of the original drying drum 2, and a buffer roller (not shown) is provided under the belt of the original feeding belt conveyor 72 to reduce the impact of the material on the belt when it falls, thereby extending the service life of the belt of the original feeding belt conveyor 72. During operation, when only virgin aggregate needs to be produced and there is no need to treat asphalt-containing exhaust gas, the preheating feed conveyor 43 is controlled to start the reverse mode, so that the preheating feed conveyor 43 can transport the virgin aggregate to the steering conveyor 71, and then the steering conveyor 71 can transport the virgin aggregate to the virgin feed conveyor 72, so that the virgin feed conveyor 72 can transport the virgin aggregate to the virgin drying drum 2; when it is necessary to mix recycled materials and virgin aggregate for production, the preheating feed conveyor 43 is controlled to start the forward mode, so that the preheating feed conveyor 43 can transport the virgin aggregate into the preheating drum 41 for preheating, and then the preheated virgin aggregate is transported to the virgin drying drum 2 through the virgin feed conveyor 72.

[0060] The present invention further includes a steering belt conveyor 71 and a virgin feed belt conveyor 72 in the design of the production equipment 100, and connects the discharge end of the preheating roller 41 to the virgin feed belt conveyor 72. The preheating feed belt conveyor 43 is designed to be a belt conveyor with forward and reverse functions. This allows for flexible switching between production modes with and without recycled materials during actual production. The entire mode switching process does not require machine shutdown and only requires one-button operation through the control panel. The switching time is short, which can ensure continuous and stable production.

[0061] In specific implementation of this invention, a second regulating damper 73 can be installed between the dust removal system 3 and the preheating drum 41, and a third regulating damper 74 can be installed between the dust removal system 3 and the primary drying drum 2. During operation, when only primary aggregate needs to be produced without treating asphalt-containing exhaust gas, the second regulating damper 73 needs to be closed to prevent the exhaust gas discharged from the primary drying drum 2 from entering the preheating drum 41. When it is necessary to mix recycled materials with primary aggregate for production, the second regulating damper 73 needs to be opened. Simultaneously, the opening of the third regulating damper 74 can be adjusted according to actual needs during production. Furthermore, the dust removal system 3 of this invention can specifically be a bag filter system, mainly used for dust removal of the exhaust gas discharged from the primary drying drum 2. Also, since the high-temperature exhaust gas may carry dust during heat exchange with the primary aggregate, the exhaust gas finally discharged from the preheating drum 41 can also be treated by the dust removal system 3.

[0062] In some embodiments of the present invention, in order to achieve efficient material conveying and efficient heat exchange, please refer to Figures 2-5 for details. The preheating drum 41 has a guiding section 411, a lifting and heating section 412, and a discharge section 413. The inner wall of the guiding section 411 is provided with a first guiding plate group 46, which includes a plurality of first guiding plates 461 distributed along the circumference. The inner wall of the lifting and heating section 412 is provided with a plurality of second guiding plate groups 47 and a plurality of radial lifting and lifting plate groups 48 along the axial direction. The second guiding plate groups 47 include a plurality of second guiding plates 471 distributed along the circumference, and the radial lifting and lifting plate groups 48 include a plurality of radial lifting and lifting plates 481 distributed along the circumference. The second guiding plate groups 47 and the radial lifting and lifting plate groups 48 are alternately distributed. The inner wall of the discharge section 413 is provided with at least one deflecting plate group 49, which includes a plurality of deflecting plates 491 distributed along the circumference.

[0063] Furthermore, the first guide plate 461 is a continuous spiral blade with a large inclination angle and a small pitch. The inclination angle of the continuous spiral blade is 35°-40°, and the pitch of the continuous spiral blade is 0.8-1.0 times the inner diameter of the preheating drum. Specifically, the first guide plate can be made of wear-resistant plate. By adopting the above structural design of the first guide plate 461, when the material enters from the feed inlet of the preheating drum 41, it can be quickly and continuously caught and pushed into the interior of the preheating drum 41 by the first guide plate 461, thereby effectively preventing the material from accumulating at the feed inlet, realizing the smooth introduction of the material flow, and seamlessly connecting with the subsequent process. As a specific embodiment of the present invention, the inclination angle of the continuous spiral blade is 35°.

[0064] The second guide plate 471 is an inclined bent plate, and the second guide plates 471 of each second guide plate group 47 together form a discontinuous intermittent spiral guide channel. The function of each second guide plate group 47 is to mimic the effect of a large-pitch spiral. When the preheating drum 41 rotates, it can gently "push" and push the material towards the discharge end, while leaving space for the material to be lifted and scattered. Each radial lifting plate group 48 is mainly responsible for lifting the material to a high place and then scattering it to form a uniform material curtain. By adopting the combination design of alternating second guide plate groups 47 and radial lifting plate groups 48, the cyclic effect of "intermittent propulsion and lifting and scattering" can be well achieved, so that the material can fully contact the high-temperature exhaust gas flowing in the opposite direction and improve the heat exchange efficiency.

[0065] The material-pushing plate 491 is a straight or slightly curved plate with a certain width. One end of the material-pushing plate 491 is welded to the inner wall of the discharge section 413, and the other end of the material-pushing plate 491 extends towards the center of the preheating drum 41 to form a cantilever beam structure. Each material-pushing plate 491 is inclined at a certain angle towards the discharge end of the preheating drum 41. The function of each material-pushing plate 491 is to receive the material conveyed from the lifting and heating section 412 and guide and push the material smoothly and evenly out of the discharge port of the preheating drum 41, thereby avoiding the accumulation of material at the discharge port of the preheating drum 41.

[0066] In some embodiments of the present invention, the production equipment 100 further includes a return air duct 8; the discharge end of the regenerated drying drum 1 is connected to a hot air furnace 11, and the output end of the cyclone dust collector 5 is connected to the hot air furnace 11 through the return air duct 8. The regenerated drying drum 1 is a counter-current drum, meaning that the conveying direction of the recycled material is opposite to the conveying direction of the heating airflow within the regenerated drying drum 1, thereby better achieving the heating and drying of the recycled material. The present invention connects the output end of the cyclone dust collector 5 to the hot air furnace 11 through the return air duct 8, so that during operation, a portion of the asphalt-containing exhaust gas can be returned to the hot air furnace 11 for re-combustion and reuse.

[0067] In some embodiments of the present invention, the production equipment 100 further includes a primary aggregate elevator 91, a secondary aggregate elevator 92, a secondary feed conveyor 93, a secondary cold storage silo 94, and a mixing device; the discharge end of the primary aggregate drying drum 2 is connected to the lower end of the primary aggregate elevator 91, and the upper end of the primary aggregate elevator 91 is connected to the mixing device, so as to use the primary aggregate elevator 91 to transport the primary aggregate heated by the primary aggregate drying drum 2 to the mixing device; a cyclone dust collector 5 is connected to the primary aggregate elevator 91 to realize the conveying of particulate matter generated by dust collection into the primary aggregate elevator 91 and mixing with the primary aggregate. The virgin aggregates are mixed; the upper end of the recycling elevator 92 is connected to the feed end of the recycling drying drum 1, and the discharge end of the recycling drying drum 1 is connected to the mixing device, so that the recycled material heated by the recycling drying drum 1 can be conveyed to the mixing device by the recycling elevator 92; the recycling feed belt 93 is connected to the lower end of the recycling elevator 92, and the recycling cold material bin 94 is located above the recycling feed belt 93. During operation, the recycled material is conveyed to the recycling feed belt 93 through the recycling cold material bin 94, and then the recycled material is conveyed to the recycling elevator 92 by the recycling feed belt 93.

[0068] In a specific implementation of this invention, the mixing device specifically includes a mixing cylinder 951, an aggregate weighing scale 952, a powder weighing scale 953, an asphalt weighing scale 954, a recycled material weighing scale 955, a vibrating screen 956, and a recycled material temporary storage bin 957; wherein, the aggregate weighing scale 952, the powder weighing scale 953, the asphalt weighing scale 954, and the recycled material weighing scale 955 are all located above the mixing cylinder 951, so as to realize the feeding of the weighed virgin aggregate, powder, asphalt, and recycled material into the mixing cylinder 951 for mixing; the recycled material The temporary storage bin 957 is connected between the recycled material weighing scale 955 and the discharge end of the recycled drying drum 1, so as to send the recycled material output from the recycled drying drum 1 into the recycled material temporary storage bin 957 for temporary storage, and then send it to the recycled material weighing scale 955 for weighing when needed; the vibrating screen 956 is connected between the aggregate weighing scale 952 and the discharge end of the virgin elevator 91, so as to send the virgin aggregate to the vibrating screen 956 for screening, and then send the screened virgin aggregate to the aggregate weighing scale 952 for weighing when needed.

[0069] Example 2

[0070] Please refer to Figures 1-5. This invention provides a production method for an asphalt mixture mixing production equipment 100 with heat recovery. The specific structure of the production equipment 100 and the technical effects it achieves are exactly the same as in Embodiment 1. For details, please refer to the detailed description of Embodiment 1, which will not be repeated here. The production method includes:

[0071] The asphalt-containing exhaust gas discharged from the regenerated drying drum 1 is sent to the cyclone dust collector 5 for cyclone dust removal. The dust removal efficiency of the cyclone dust collector 5 is ≥95%. By using the cyclone dust collector 5 for cyclone dust removal, on the one hand, coarse particles in the regenerated exhaust gas (i.e., asphalt-containing exhaust gas) can be removed, preventing coarse particles from entering subsequent equipment such as fans and incinerators and causing wear or blockage of components, thus effectively protecting the fans and other equipment; on the other hand, the separated coarse particles can be discharged into the primary elevator 91 through the discharge pipe, so that the separated coarse particles can be mixed with the primary aggregate and enter the subsequent processing process together, thereby realizing the secondary utilization of resources.

[0072] The asphalt-containing exhaust gas after dust removal is sent into incinerator 6 for complete combustion to obtain high-temperature exhaust gas. In specific implementation of the present invention, after the asphalt-containing exhaust gas enters incinerator 6, it can be fully combusted at a high temperature of 800℃-1000℃ (combustion time ≥2 seconds). This can completely decompose the harmful components and odors in the asphalt fumes. After combustion, it can produce high-temperature exhaust gas of 800℃-1000℃. Since the incinerator 6 eliminates the heat exchanger, the high-temperature exhaust gas does not need to be transferred through the heat exchanger and can be directly transported to the preheating system through a high-temperature resistant flue gas pipe (made of heat-resistant steel, temperature resistance ≥1200℃).

[0073] The invention utilizes a preheating system to transport raw aggregates and inputs high-temperature exhaust gas from combustion into the preheating system, allowing heat exchange between the raw aggregates and the high-temperature exhaust gas. The raw aggregates and high-temperature exhaust gas are transported in opposite directions, thereby preheating the raw aggregates from room temperature to a set temperature range, specifically 80℃-150℃. In a specific implementation, the invention involves controlling the preheating feed conveyor 43 to start forward rotation, transporting the raw aggregates to the preheating elevator 42, and then the preheating elevator 42 transports the raw aggregates to the preheating feeder. In the hot roller 41, after the raw aggregate enters the feed inlet of the preheating roller 41, it is first pushed into the interior of the preheating roller 41 by the first guide plate group 46, and then repeatedly lifted and scattered by the radial lifting lifting plate group 48 to form a material curtain. The raw aggregate is continuously pushed forward by the second guide plate group 47. During this process, the raw aggregate will fully exchange heat with the high temperature exhaust gas input from the other end of the preheating roller 41. The heat exchange time can be adjusted according to the moisture content of the aggregate, so that the temperature of the raw aggregate is preheated from room temperature to 80℃-150℃ (preferably 100-120℃).

[0074] The preheating system outputs the preheated virgin aggregate to the virgin drying drum 2. Specifically, the virgin aggregate is evenly discharged from the preheating drum 41 by the action of the feeding plate group 49, and then fed into the virgin drying drum 2 via the virgin feed belt conveyor 72. Since the virgin aggregate has been preheated, the heating requirement of the virgin drying drum 2 for the virgin aggregate is greatly reduced. Actual testing has verified that the oil consumption of the burner 21 of the virgin drying drum 2 can be reduced by about 15%-25%. At the same time, the exhaust gas after heat exchange and the exhaust gas generated by the virgin drying drum 2 are output to the dust removal system 3 for dust removal treatment to ensure that the final exhaust gas meets environmental standards.

[0075] In some embodiments of the present invention, the production method further includes:

[0076] The particulate matter generated by the cyclone dust collector 5 is conveyed to the original aggregate elevator 91, so that the particulate matter generated by the dust collector is mixed with the original aggregate and enters the subsequent processing process, thereby realizing the secondary utilization of resources and avoiding waste.

[0077] A first temperature sensor located at the air inlet of the preheating drum 41 monitors the temperature of the high-temperature exhaust gas in real time. When the temperature of the high-temperature exhaust gas is detected to be higher than a first preset temperature value (e.g., 950℃), the opening of the first regulating damper 45 is reduced (by 5%-10% each time) to reduce the amount of high-temperature exhaust gas introduced into the preheating drum 41, thereby preventing the raw aggregate from being overheated. When the temperature of the high-temperature exhaust gas is detected to be lower than a second preset temperature value (e.g., 850℃), the opening of the first regulating damper 45 is increased to increase the amount of high-temperature exhaust gas introduced into the preheating drum 41. The amount of gas is controlled to ensure that the raw aggregate reaches the set temperature range (80℃-150℃); when the temperature of the high-temperature exhaust gas is detected to be less than or equal to the first preset temperature value (950℃) and greater than or equal to the second preset temperature value (850℃), the first regulating damper 45 is controlled to keep its opening unchanged; in specific implementation of the present invention, the temperature measurement range of the first temperature sensor is 0-1200℃, and the measurement accuracy is ±1℃; the adjustment accuracy of the first regulating damper 45 is ±2%; by adopting the above scheme, the amount of high-temperature exhaust gas introduced can be accurately controlled in real time.

[0078] Since the target heating temperature of the virgin aggregate in the primary drying drum 2 is typically 160-180℃, this invention, by installing a second temperature sensor at the discharge end of the preheating drum 41, enables dynamic control of the fuel supply to the burner 21 of the primary drying drum 2 based on the monitored temperature of the virgin aggregate and the target heating temperature of the primary drying drum 2 during operation. Specifically, this includes: using the second temperature sensor at the discharge end of the preheating drum 41 to monitor the temperature of the preheated virgin aggregate in real time, and when the monitored temperature of the virgin aggregate reaches a preset first temperature range (e.g., 120-150℃), controlling the burner 21 of the primary drying drum 2 to reduce the fuel supply (per unit of fuel). (The fuel consumption is reduced by 5%-8%). When the temperature of the raw aggregate is detected to be lower than the preset second temperature range (e.g., 80-100℃), the burner 21 of the raw aggregate drying drum 2 is controlled to increase the fuel supply. When the temperature of the raw aggregate is detected to be lower than the preset first temperature range but not lower than the preset second temperature range, the burner 21 of the raw aggregate drying drum 2 is controlled to maintain the fuel supply. In specific implementation of the present invention, the temperature measurement range of the second temperature sensor is 0-200℃, and the measurement accuracy is ±0.5℃. By adopting the above-mentioned scheme of the present invention, it is possible to ensure that the final drying temperature of the raw aggregate meets the standard while minimizing fuel consumption and achieving stable and efficient operation of the system.

[0079] In some embodiments of the present invention, the production method further includes:

[0080] When only virgin aggregate is produced without the need to treat asphalt-containing exhaust gas, the preheated feed conveyor 43 is controlled to start the reverse mode. The virgin aggregate is transported to the virgin drying drum 2 by the steering conveyor 71 and the virgin feed conveyor 72. After that, production can proceed according to conventional drying, lifting, screening, and mixing processes. The entire mode switching process does not require machine shutdown and can be operated with one button on the control panel. The switching time is short, which can ensure continuous and stable production. The exhaust gas generated by the virgin drying drum 2 is output to the dust removal system 3 for dust removal treatment to ensure that the final exhaust gas meets environmental standards.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An asphalt mixture mixing and production equipment with heat recovery, comprising a recycled drying drum, a primary drying drum, and a dust removal system; characterized in that, It also includes a preheating system, a cyclone dust collector, and an incinerator; the outlet of the regenerated drying drum is connected to the inlet of the cyclone dust collector, the outlet of the cyclone dust collector is connected to the incinerator, and the incinerator is connected to the inlet of the preheating system; the outlets of the preheating system and the virgin drying drum are both connected to the dust collection system, and the discharge end of the preheating system is connected to the feed end of the virgin drying drum; the preheating system includes a preheating drum, a preheating elevator, a preheating feed belt conveyor, and a virgin cold material silo; several virgin cold material silos are located above the preheating feed belt conveyor; one end of the preheating feed belt conveyor is connected to the lower end of the preheating elevator, and the upper end of the preheating elevator is connected to the feed end of the preheating drum. The discharge end of the heating drum is connected to the feed end of the primary drying drum, the air inlet end of the preheating drum is connected to the incinerator, and the air outlet end of the preheating drum is connected to the dust removal system. The preheating drum is a counter-current drum. The air inlet end of the preheating drum is equipped with a first temperature sensor and a first regulating damper. The discharge end of the preheating drum is equipped with a second temperature sensor. The system also includes a steering belt conveyor and a primary feed belt conveyor. One end of the primary feed belt conveyor is connected to the feed end of the primary drying drum, and the steering belt conveyor is located between the other end of the preheating feed belt conveyor and the other end of the primary feed belt conveyor. The primary drying drum is a counter-current drum, and the preheating feed belt conveyor is a belt conveyor with forward and reverse functions.

2. The asphalt mixture mixing and production equipment with heat recovery according to claim 1, characterized in that, The preheating drum has a guiding section, a lifting and heating section, and a discharge section. The inner wall of the guiding section is provided with a first guiding plate group, which includes several first guiding plates distributed along the circumference. The inner wall of the lifting and heating section is provided with several second guiding plate groups and several radial lifting and lifting plate groups along the axial direction. The second guiding plate groups include several second guiding plates distributed along the circumference, and the radial lifting and lifting plate groups include several radial lifting and lifting plates distributed along the circumference. The second guiding plate groups and the radial lifting and lifting plate groups are alternately distributed. The inner wall of the discharge section is provided with at least one deflecting plate group, which includes several deflecting plates distributed along the circumference.

3. The asphalt mixture mixing and production equipment with heat recovery according to claim 2, characterized in that, The first guide plate is a continuous spiral blade with a large inclination angle and a small pitch. The inclination angle of the continuous spiral blade is 35°-40°, and the pitch of the continuous spiral blade is 0.8-1.0 times the inner diameter of the preheating drum. The second guide plate is an inclined bent plate, and the second guide plates of each second guide plate group together form a discontinuous intermittent spiral guide channel. The deflector plate is a straight plate or a slightly arc-shaped plate with a certain width. One end of the deflector plate is welded to the inner wall of the discharge section, and the other end of the deflector plate extends towards the center of the preheating drum to form a cantilever beam structure. Each deflector plate is inclined at a certain angle towards the discharge end of the preheating drum.

4. The asphalt mixture mixing and production equipment with heat recovery according to claim 1, characterized in that, It also includes a return air duct; the discharge end of the regenerated drying drum is connected to a hot air furnace, the output end of the cyclone dust collector is connected to the hot air furnace through the return air duct, and the regenerated drying drum is a counter-current drum.

5. The asphalt mixture mixing and production equipment with heat recovery according to claim 1, characterized in that, It also includes a primary elevator, a regenerated elevator, a regenerated feed belt conveyor, a regenerated cold silo, and a mixing device; the discharge end of the primary drying drum is connected to the lower end of the primary elevator, the upper end of the primary elevator is connected to the mixing device, and a cyclone dust collector is connected to the primary elevator; the upper end of the regenerated elevator is connected to the feed end of the regenerated drying drum, the discharge end of the regenerated drying drum is connected to the mixing device, the regenerated feed belt conveyor is connected to the lower end of the regenerated elevator, and the regenerated cold silo is located above the regenerated feed belt conveyor.

6. A production method for an asphalt mixture mixing production equipment with heat recovery as described in any one of claims 1-5, characterized in that, The production method includes: sending the asphalt-containing fumes discharged from the recycled drying drum into a cyclone dust collector for cyclone dust removal; sending the dust-removed asphalt-containing fumes into an incinerator for complete combustion to obtain high-temperature exhaust gas; using a preheating system to transport virgin aggregates and inputting the high-temperature exhaust gas after combustion into the preheating system, allowing the virgin aggregates and high-temperature exhaust gas to exchange heat, with the virgin aggregates and high-temperature exhaust gas being transported in opposite directions, thereby preheating the virgin aggregates from room temperature to a set temperature range; the preheating system outputs the preheated virgin aggregates to the virgin drying drum, while simultaneously outputting the heat-exchanged exhaust gas and the exhaust gas generated by the virgin drying drum to a dust removal system for dust removal treatment; the production method further includes: when only virgin aggregates are produced and there is no need to treat the asphalt-containing fumes, controlling the preheating feed conveyor to start the reverse mode, using the steering conveyor and the virgin feed conveyor to transport the virgin aggregates to the virgin drying drum, and outputting the exhaust gas generated by the virgin drying drum to the dust removal system for dust removal treatment.

7. The production method of an asphalt mixture mixing production equipment with heat recovery according to claim 6, characterized in that, The production method further includes: conveying particulate matter generated by cyclone dust collectors to the primary aggregate elevator, so that the particulate matter generated by dust collectors is mixed with the primary aggregate and enters the subsequent processing flow; using a first temperature sensor located at the air inlet end of the preheating drum to monitor the temperature of the high-temperature exhaust gas in real time, and when the temperature of the high-temperature exhaust gas is detected to be higher than a first preset temperature value, controlling the opening of the first regulating damper to decrease; when the temperature of the high-temperature exhaust gas is detected to be lower than a second preset temperature value, controlling the opening of the first regulating damper to increase; when the temperature of the high-temperature exhaust gas is detected to be less than or equal to the first preset temperature value and greater than or equal to the second preset temperature value, controlling the opening of the first regulating damper to remain unchanged; using a second temperature sensor located at the discharge end of the preheating drum to monitor the temperature of the preheated primary aggregate in real time, and when the temperature of the primary aggregate reaches a preset first temperature range, controlling the burner of the primary drying drum to decrease the fuel supply; when the temperature of the primary aggregate is detected to be lower than a preset second temperature range, controlling the burner of the primary drying drum to increase the fuel supply; when the temperature of the primary aggregate does not reach the preset first temperature range but is not lower than the preset second temperature range, controlling the burner of the primary drying drum to maintain the fuel supply unchanged.

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