Double-regeneration-roller asphalt mixing plant and using method thereof

Abstract

The invention discloses a double-regeneration-roller asphalt mixing plant and a using method thereof, and relates to the technical field of asphalt regeneration, the double-regeneration-roller asphalt mixing plant comprises a first feeding device, a first waste gas recovery device, a first discharging end seat, a first hot blast stove, a first auxiliary fan and a first combustor which are connected together, the first feeding device is connected with the first waste gas recovery device, and the first waste gas recovery device is connected with the first auxiliary fan; an air inlet in the upper end of the first discharging end seat is connected with a first hot blast stove, a first combustor is arranged above the first hot blast stove, a first auxiliary fan is arranged on the side face of the first hot blast stove, and the hot blast stove further comprises a second feeding device, a second waste gas recycling device, a second discharging end seat, a second hot blast stove, a second auxiliary fan and a second combustor. According to the design, heat screening and heat caching equipment in a traditional primary heating system of the leaching and mixing plant is omitted, the technological process is optimized, the equipment manufacturing cost is reduced, control is easy, meanwhile, the maintenance difficulty is reduced, and production modes are diversified and flexible.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt regeneration, and in particular to a double-regeneration drum asphalt mixing plant and a use method thereof. Background Art

[0002] In the technical field of intermittent asphalt mixing plants, with the increasing awareness of environmental protection and resource recycling, the application of recycled asphalt is becoming more and more widespread. Although traditional intermittent asphalt mixing plants are claimed to be able to achieve a high proportion of recycled material addition, in the actual production process, they often still need to be combined with the supplement of virgin materials to ensure the precise control of the proportions of each component in the finished asphalt mixture. Although this production mode that combines virgin and recycled materials has improved the efficiency of resource utilization to a certain extent, some existing technologies, such as the efficient countercurrent asphalt regeneration heat system and its control method of patent number 202311407857.0, have optimized and innovated the asphalt regeneration heat system in local links, there are still many technical difficulties in the overall layout and systematic solution of sticky materials and smoke emissions as follows:

[0003] 1. There are significant differences in the heating and processing of virgin and recycled materials. The virgin material heating system usually includes equipment such as virgin drum, hot material screening system and hot material buffer bin, which play a key role in ensuring uniform heating and accurate screening of virgin materials. However, the heating and processing of recycled materials is more complicated because recycled materials often contain higher asphalt content and different types of waste asphalt mixtures, which makes the recycled drum prone to sticking, difficult to clean, time-consuming and labor-intensive. At the same time, sticking not only affects the working efficiency of the recycled drum, but may also damage the equipment and increase maintenance costs.

[0004] 2. During the heating and processing process, asphalt will produce a large amount of smoke, which contains organic pollutants. If these fumes are not effectively treated, they will not only reduce the service life of the bag filter, but also may pollute the surrounding environment.

[0005] 3. Most of the existing raw material processing technologies follow the traditional "raw material heating, thermal screening, caching, and metering" process, lacking innovation and optimization of the overall process layout. This model increases production costs and energy consumption.

[0006] Therefore, it is particularly important to develop a new asphalt mixing plant technology that can overcome the shortcomings of existing technologies and achieve efficient processing of recycled materials and environmentally friendly emissions.

[0007] Based on the above reasons, the present invention proposes a double-regeneration drum asphalt mixing plant and a method of using the same. Summary of the invention

[0008] The purpose of the present invention is to solve the problems of large differences in heating treatment between virgin and recycled materials, difficulty in cleaning the sticky materials on the recycled drum, and pollution caused by asphalt fume emissions in the prior art, and to propose an innovative solution. By optimizing the overall structural layout, adjusting the production process, and improving the asphalt fume treatment capacity, the present invention aims to achieve efficient utilization and environmentally friendly emissions of recycled materials and promote the further development of intermittent asphalt mixing plant technology. A double recycled drum asphalt mixing plant and its use method are proposed.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A double regeneration drum asphalt mixing plant, comprising a first feeding device, a first waste gas recovery device, a first discharge end seat, a first hot blast furnace, a first auxiliary fan, and a first burner connected together, wherein the first feeding device is connected to the first waste gas recovery device, the air inlet at the upper end of the first discharge end seat is connected to the first hot blast furnace, a first burner is arranged above the first hot blast furnace, a first auxiliary fan is arranged on the side of the first hot blast furnace, and further comprising,

[0011] The second feeding device, the second exhaust gas recovery device, the second discharge end seat, the second hot air furnace, the second auxiliary fan, the second burner,

[0012] The second feeding device is connected to the second exhaust gas recovery device, the air inlet at the upper end of the second discharge end seat is connected to the second hot blast stove, a second burner is arranged above the second hot blast stove, a second auxiliary fan is arranged on the side of the second hot blast stove, and,

[0013] A double regeneration drum component, a metering component is also arranged below the double regeneration drum component, a cross flue component is arranged above the double regeneration drum component, the first exhaust gas recovery device and the second exhaust gas recovery device are also connected to an exhaust gas discharge component; the first feeding device is used to input the recovered asphalt material into the first regeneration drum component, the first burner and the second burner are used to spray fuel into the first hot blast stove and the second hot blast stove for combustion, the first hot blast stove and the second hot blast stove are used to input high-temperature flue gas into the double regeneration drum component, and the high-temperature flue gas in the first hot blast stove and the second hot blast stove passes through the first The air outlets on the first discharge end seat and the second discharge end seat heat the raw material in the double regeneration drum component, and the heated raw material falls into the hot material bin along the discharge ports at the lower ends of the first discharge end seat and the second discharge end seat for storage. The first waste gas recovery device and the second waste gas recovery device introduce the hot flue gas after heat exchange with the recovered asphalt material in the double regeneration drum component into the first hot blast furnace and the second hot blast furnace through the cross flue component for reuse, thereby improving the utilization rate of energy, removing the asphalt flue gas in the tail gas, and controlling the air volume of the introduced hot flue gas through the first auxiliary fan and the second auxiliary fan;

[0014] The exhaust gas emission components include a bag dust collector, an induced draft fan, a chimney, a first exhaust pipe and a second exhaust pipe; the first exhaust pipe is connected to a first exhaust gas recovery device, the second exhaust pipe is connected to a second exhaust gas recovery device, the first exhaust pipe and the second exhaust pipe are interconnected and connected to the bag dust collector, the upper end of the bag dust collector is connected to the induced draft fan, and the upper end of the induced draft fan is connected to the chimney, and the exhaust gas is discharged along the chimney after being dedusted by the bag dust collector, so as to realize the regeneration of asphalt material, the recovery and reuse of exhaust gas, and the discharge of purified exhaust gas.

[0015] Preferably, the double regeneration drum component includes a first regeneration drum, a second regeneration drum, a first drum base and a second drum base, which are used to realize the alternating treatment of recycled asphalt material and raw material; the feed port of the first regeneration drum is connected to the first feed device, the discharge port of the first regeneration drum is connected to the air outlet of the first discharge end seat, the feed port of the first regeneration drum is also connected to the first exhaust gas recovery device, and the first drum base is arranged below the first regeneration drum;

[0016] The feed port of the second regeneration drum is connected to the second feed device, the discharge port of the second regeneration drum is connected to the air outlet of the second discharge end seat, the feed port of the second regeneration drum is also connected to the second exhaust gas recovery device, and the second drum base is arranged below the second regeneration drum.

[0017] Preferably, the first regeneration drum and the second regeneration drum are counter-current regeneration drums, and the first regeneration drum and the second regeneration drum rotate in opposite directions at the bottom, so as to facilitate the discharge and scattering trajectories of the recovered asphalt and original sand and gravel to converge towards the center line.

[0018] Preferably, the metering and stirring components include a first buffer bin, a second buffer bin, a first metering scale, a second metering scale, a stirring pot, a powder scale and an asphalt scale. The first buffer bin is connected to the discharge port at the lower end of the first discharge end seat, the first metering scale is arranged below the first buffer bin, the second buffer bin is connected to the discharge port at the lower end of the second discharge end seat, the second metering scale is arranged below the second buffer bin, the stirring pot is arranged below the first metering scale and the second metering scale, the stirring pot is provided with a powder scale and an asphalt scale, the powder scale is connected to the bag dust collector through a pipe, and is used to meter the added powder.

[0019] Preferably, the cross flue component includes a first circulating flue and a second circulating flue, one end of the first circulating flue is connected to a first auxiliary fan, and the other end of the first circulating flue is connected to a first waste gas recovery device; one end of the second circulating flue is connected to a second auxiliary fan, and the other end of the second circulating flue is connected to a second waste gas recovery device, and the first circulating flue is communicated with the second circulating flue to achieve the recycling of hot flue gas and the discharge of waste gas, thereby facilitating cross flue circulation.

[0020] Preferably, a first air return valve is provided on the first circulation flue, a first exhaust valve is provided on the first exhaust pipe, a second air return valve is provided on the second circulation flue, and a second exhaust valve is provided on the second exhaust pipe, for controlling the circulation of hot flue gas and waste gas.

[0021] Preferably, the first buffer bin and the second buffer bin are located directly below the eccentrically arranged throwing path of the two discharge ports of the double regeneration drum component, and the stirring pot is located directly below the first buffer bin and the second buffer bin, so as to optimize the discharge and receiving process of the asphalt material.

[0022] A method for using a double-regeneration drum asphalt mixing plant, the method comprising:

[0023] S1, first cycle production operation: close the second air return valve and the first exhaust valve at the same time, and open the first air return valve and the second exhaust valve, start the first burner and the second burner in the first hot blast stove and the second hot blast stove, provide circulating exhaust gas through the first auxiliary fan and the second auxiliary fan to preheat the first hot blast stove and the second hot blast stove, and add the recovered asphalt material into the first regeneration drum through the first feeding device;

[0024] The first regeneration drum is started to exchange heat between the recovered asphalt material in the drum and the high-temperature flue gas introduced from the first hot blast furnace, and the generated asphalt-containing flue gas is recovered through the first exhaust gas recovery device, and the asphalt-containing flue gas is introduced into the first hot blast furnace and the second hot blast furnace for reuse;

[0025] At the same time, raw sand and gravel are added to the second regeneration drum through the second feeding device, and the second regeneration drum operates independently, and the generated exhaust gas enters the exhaust gas emission component from the second exhaust pipe for purification and emission;

[0026] After the reclaimed asphalt in the first regeneration drum is regenerated, it is discharged to the first buffer bin through the first discharging end seat and measured by the first measuring scale;

[0027] S2, alternating production operation: after the first cycle of production operation is completed, the first air return valve and the second air exhaust valve are closed, and the second air return valve and the first air exhaust valve are opened, and the feeding mode is switched at the same time, raw sand and gravel are added to the first regeneration drum, and recycled asphalt is added to the second regeneration drum;

[0028] The second regeneration drum starts to operate, and the asphalt-containing flue gas generated therein is recovered through the second exhaust gas recovery device, and the asphalt-containing flue gas is introduced into the first hot blast furnace and the second hot blast furnace for reuse;

[0029] At this time, the original sand and gravel in the first regeneration drum exchange heat with the high-temperature flue gas introduced from the first hot blast furnace to complete the heating process, and the asphalt-containing regeneration material previously adhered to the inner wall of the first regeneration drum is cleaned;

[0030] After the regenerated asphalt in the second regeneration drum is regenerated and heated, it is discharged to the second buffer bin through the second discharging end seat and measured by the second measuring scale;

[0031] S3, mixing and stirring stage: the original sand and gravel hot materials and the recycled asphalt materials in the first and second buffer bins are fed into the mixing pot according to a certain proportion, and appropriate amounts of powder and asphalt are added to the mixing pot through a powder scale and an asphalt scale;

[0032] Start the mixing pot to mix and stir to obtain a uniform asphalt mixture;

[0033] Repeat steps S1 to S3 to achieve alternating production of the dual regeneration drums and continuous supply of regenerated asphalt.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention realizes independent heating treatment of virgin material and recycled material through the double regeneration drum design, avoids mutual influence between the two during the heating process, improves the processing efficiency, and can also use virgin material or recycled asphalt material for the two regeneration drums. It supports double-drum production and single-drum production modes, and can be flexibly adjusted according to production needs, thereby improving the adaptability and flexibility of the equipment. When the recycled material mixed loading mode is used, the production capacity can reach full load production state, and the production capacity adjustment range is large.

[0036] The lower part of the double regeneration drum components rotates in opposite directions, and the material throwing path at the discharge end is optimized to ensure uniform heating and efficient discharge of the material, reduce the sticking of the material in the buffer bin, and improve the working efficiency and stability of the equipment.

[0037] 2. The present invention ensures that the asphalt fume generated when any regeneration heating system processes materials can be effectively transported to the two hot blast furnaces for combustion purification through the arrangement of cross-flue components, thereby removing toxic pollutants in the flue gas, such as benzopyrene, and achieving environmentally friendly emissions. At the same time, due to the design of the double regeneration drum components, the original material and the recycled material can be used interchangeably. When the original material and the recycled material exchange the regeneration heating system, the original material can wash off the recycled material adhering to the drum, eliminating the need for manual cleaning and further improving the production flexibility and resource utilization efficiency.

[0038] The exhaust gas emission components include bag dust collector, induced draft fan and chimney, which further improve the flue gas purification efficiency. Since there is no asphalt flue gas transported to the bag dust collector, the condensed asphalt particles are avoided from contaminating the bags, which can greatly extend the life of the bags and reduce maintenance costs.

[0039] 3. The present invention eliminates the screening and caching links in the traditional raw material heating system, simplifies the overall structure, reduces the complexity of the equipment, and reduces energy consumption. Accurate continuous metering ensures the accurate ratio of raw materials and recycled materials, avoids unnecessary waste, and improves resource utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the overall structure of a double-regeneration drum asphalt mixing plant proposed by the present invention;

[0041] Figure 2 A three-dimensional diagram of a double-regeneration drum asphalt mixing plant proposed by the present invention;

[0042] Figure 3 It is a schematic diagram of the installation structure of the double regeneration drum component in the present invention;

[0043] Figure 4 This is a rear view of a double-regeneration drum asphalt mixing plant proposed by the present invention.

[0044] In the figure: 11, the first feeding device; 12, the first exhaust gas recovery device; 13, the first discharge end seat; 14, the first hot blast furnace; 15, the first auxiliary fan; 16, the first burner; 17, the first exhaust pipe; 171, the first exhaust valve; 18, the first regeneration drum; 19, the first buffer; 191, the first weighing scale; 20, the first circulation flue; 201, the first return air valve; 21, the second feeding device; 22, the second exhaust gas recovery device; 23, the second discharge end seat; 24, the second hot blast furnace; 25, the second auxiliary fan; 26, the second burner; 27, the second exhaust pipe; 271, the second exhaust valve; 28, the second regeneration drum; 29, the second buffer; 291, the second weighing scale; 30, the second circulation flue; 301, the second return air valve; 3, the bag filter; 4, the induced draft fan; 5, the chimney; 6, the stirring pot; 7, the powder scale; 8, the asphalt scale. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0046] See also Figures 1 to 4This embodiment describes in detail the specific structure and functional implementation of a double-regeneration drum asphalt mixing plant and its use method.

[0047] A double regeneration drum asphalt mixing plant, comprising a first feeding device 11, a first exhaust gas recovery device 12, a first discharge end seat 13, a first hot blast furnace 14, a first auxiliary fan 15, and a first burner 16 connected together, wherein the first feeding device 11 is connected to the first exhaust gas recovery device 12, the air inlet at the upper end of the first discharge end seat 13 is connected to the first hot blast furnace 14, a first burner 16 is arranged above the first hot blast furnace 14, and a first auxiliary fan 15 is arranged on the side of the first hot blast furnace 14, and further comprising:

[0048] A second feeding device 21, a second waste gas recovery device 22, a second discharge end seat 23, a second hot blast furnace 24, a second auxiliary fan 25, and a second burner 26. The second feeding device 21 is connected to the second waste gas recovery device 22. The air inlet at the upper end of the second discharge end seat 23 is connected to the second hot blast furnace 24. A second burner 26 is arranged above the second hot blast furnace 24. A second auxiliary fan 25 is arranged on the side of the second hot blast furnace 24, and,

[0049] A double regeneration drum component, a metering and stirring component is also arranged below the double regeneration drum component, a cross flue component is arranged above the double regeneration drum component, the first exhaust gas recovery device 12 and the second exhaust gas recovery device 22 are also connected to the exhaust gas discharge component; the first feeding device 11 inputs the recovered asphalt material into the double regeneration drum component, the first burner 16 and the second burner 26 are used to spray fuel into the first hot blast stove 14 and the second hot blast stove 24 for combustion, the first hot blast stove 14 and the second hot blast stove 24 are used to input high-temperature flue gas into the double regeneration drum component, and the high temperature in the first hot blast stove 14 and the second hot blast stove 24 The flue gas passes through the air outlets on the first discharge end seat 13 and the second discharge end seat 23 to heat the recovered asphalt material in the double regeneration drum component. The heated recovered asphalt material falls into the buffer bin along the discharge outlets at the lower ends of the first discharge end seat 13 and the second discharge end seat 23 for storage. The first exhaust gas recovery device 12 and the second exhaust gas recovery device 22 introduce the hot flue gas after heat exchange with the recovered asphalt material in the double regeneration drum component into the first hot blast furnace 14 and the second hot blast furnace 24 through the cross flue component for reuse, thereby improving the energy utilization rate. The air volume of the introduced hot flue gas is controlled by the first auxiliary fan 15 and the second auxiliary fan 25.

[0050] The exhaust gas emission components include a bag dust collector 3, an induced draft fan 4, a chimney 5, a first exhaust pipe 17 and a second exhaust pipe 27; the first exhaust pipe 17 is connected to the first exhaust gas recovery device 12, and the second exhaust pipe 27 is connected to the second exhaust gas recovery device 22. The two exhaust gas recovery devices are respectively used to collect and process the exhaust gas from the first regeneration drum 18 and the second regeneration drum 28. The first exhaust pipe 17 and the second exhaust pipe 27 are interconnected and connected to the bag dust collector 3 to facilitate the discharge of the exhaust gas. The upper end of the bag dust collector 3 is connected to the induced draft fan 4, and the upper end of the induced draft fan 4 is connected to the chimney 5. The exhaust gas is discharged along the chimney 5 after being dust-removed by the bag dust collector 3.

[0051] Further, in this embodiment, the double regeneration drum component includes a first regeneration drum 18, a second regeneration drum 28, a first drum base and a second drum base; the two regeneration drums are used to heat the material, and the two bases can support the weight of the regeneration drum and its internal mechanism, the feed port of the first regeneration drum 18 is connected to the first feed device 11, the discharge port of the first regeneration drum 18 is connected to the air outlet of the first discharge end seat 13, the feed port of the first regeneration drum 18 is also connected to the first exhaust gas recovery device 12, and the first drum base is arranged below the first regeneration drum 18;

[0052] The feed port of the second regeneration drum 28 is connected to the second feed device 21 , the discharge port of the second regeneration drum 28 is connected to the air outlet of the second discharge end seat 23 , the feed port of the second regeneration drum 28 is also connected to the second exhaust gas recovery device 22 , and the second drum base is arranged below the second regeneration drum 28 .

[0053] The first regeneration drum 18 and the second regeneration drum 28 are counter-current regeneration drums, and the first regeneration drum 18 and the second regeneration drum 28 rotate in opposite directions at the bottom, so that the discharge and scattering trajectories of the recovered asphalt and original sand and gravel are gathered toward the center line.

[0054] In this embodiment, the metering and stirring components include a first buffer bin 19, a second buffer bin 29, a first metering scale 191, a second metering scale 291, a stirring pot 6, a powder scale 7 and an asphalt scale 8. The first buffer bin 19 is connected to the discharge port at the lower end of the first discharge end seat 13, the first metering scale 191 is arranged below the first buffer bin 19, the second buffer bin 29 is connected to the discharge port at the lower end of the second discharge end seat 23, the second metering scale 291 is arranged below the second buffer bin 29, and is used to temporarily store the materials discharged from the two regeneration drums and perform precise metering. The stirring pot 6 is arranged below the first weighing scale 191 and the second weighing scale 291, and is used for receiving the measured materials and mixing and stirring. The mixing pot 6 is provided with a powder scale 7 and an asphalt scale 8, and is used for accurately adding powder and asphalt during the stirring process. The powder scale 7 is connected to the bag filter 3 through a pipeline. While filtering the exhaust gas, the bag filter 3 can recover the powder therein and add it to the mixing pot 6 again after being measured by the powder scale 7, so as to realize the recycling of resources and improve the production efficiency. Since there is no asphalt fume transported to the bag filter 3, the condensed asphalt particles are prevented from contaminating the bag, and the life of the bag can be greatly extended.

[0055] Further, in this embodiment, the cross flue component includes a first circulating flue 20 and a second circulating flue 30, one end of the first circulating flue 20 is connected to the first auxiliary fan 15, and the other end of the first circulating flue 20 is connected to the first waste gas recovery device 12; one end of the second circulating flue 30 is connected to the second auxiliary fan 25, and the other end of the second circulating flue 30 is connected to the second waste gas recovery device 22, the first circulating flue 20 and the second circulating flue 30 are connected to form a circulating flue system, and the flue gas generated when any regeneration drum processes the regenerated material will be transported to the two hot air furnaces for combustion and purification to remove the asphalt flue gas.

[0056] The first circulating flue 20 is provided with a first air return valve 201, the first exhaust pipe 17 is provided with a first exhaust valve 171, the second circulating flue 30 is provided with a second air return valve 301, and the second exhaust pipe 27 is provided with a second exhaust valve 271, so as to control the flow and discharge process of hot flue gas and waste gas.

[0057] Furthermore, in the present embodiment, the first buffer bin 19 and the second buffer bin 29 are located just below the eccentrically arranged throwing paths of the two discharge ports of the double regeneration drum component, and the stirring pot 6 is located just below the first buffer bin 19 and the second buffer bin 29. When the first regeneration drum 18 and the second regeneration drum 28 rotate towards each other, the parabola of the material falls exactly on the eccentrically arranged bottom of the two buffer bins, thereby avoiding the impact and wear of the stones on the walls of the buffer bins, extending the service life of the buffer bins, and reducing the noise level during the operation of the equipment. The two bottoms are just above the stirring pot 6, which is convenient for the direct falling of the material.

[0058] A method for using a double-regeneration drum asphalt mixing plant, the method comprising:

[0059] S1, first cycle production operation: close the second air return valve 301 and the first exhaust valve 171 at the same time, and open the first air return valve 201 and the second exhaust valve 271, start the first burner 16 and the second burner 26 in the first hot blast furnace 14 and the second hot blast furnace 24, provide circulating exhaust gas through the first auxiliary fan 15 and the second auxiliary fan 25 to preheat the first hot blast furnace 14 and the second hot blast furnace 24, and add the recovered asphalt material into the first regeneration drum 18 through the first feeding device 11;

[0060] The first regeneration drum 18 is started to exchange heat between the recovered asphalt material in the drum and the high-temperature flue gas introduced from the first hot blast furnace 14. The generated asphalt-containing flue gas is recovered by the first exhaust gas recovery device 12, and the asphalt-containing flue gas is introduced into the first hot blast furnace 14 and the second hot blast furnace 24 for reuse.

[0061] At the same time, raw sand and gravel are added to the second regeneration drum 28 through the second feeding device 21, and the second regeneration drum 28 operates independently, and the generated exhaust gas enters the exhaust gas discharge component from the second exhaust pipe 27 for purification and discharge;

[0062] After the reclaimed asphalt in the first regeneration drum 18 is regenerated, it is discharged to the first buffer bin 19 through the first discharging end seat 13 and measured by the first measuring scale 191;

[0063] S2, alternating production operation: after the first cycle of production operation is completed, the first air return valve 201 and the second exhaust valve 271 are closed, and the second air return valve 301 and the first exhaust valve 171 are opened, and the feeding mode is switched at the same time, raw sand and gravel are added to the first regeneration drum 18, and recycled asphalt is added to the second regeneration drum 28;

[0064] The second regeneration drum 28 starts to operate, and the asphalt-containing flue gas generated therein is recovered by the second exhaust gas recovery device 22, and the asphalt-containing flue gas is introduced into the first hot blast furnace 14 and the second hot blast furnace 24 for reuse;

[0065] At this time, the raw material in the first regeneration drum 18 exchanges heat with the high-temperature flue gas introduced from the first hot blast furnace 14 to complete the heating process, and the asphalt-containing regeneration material previously adhered to the inner wall of the first regeneration drum 18 is cleaned;

[0066] After the reclaimed asphalt in the second regeneration drum 28 is regenerated, it is discharged to the second buffer bin 29 through the second discharging end seat 23 and measured by the second measuring scale 291;

[0067] S3, mixing and stirring stage: the recycled asphalt in the first and second buffer bins 29 is fed into the mixing pot 6 in a certain proportion, and a proper amount of powder and asphalt is added to the mixing pot 6 through the powder scale 7 and the asphalt scale 8;

[0068] Starting the stirring pot 6 to mix and stir to obtain a uniform asphalt mixture;

[0069] Repeat steps S1 to S3 to achieve alternating production of the dual regeneration drums and continuous supply of regenerated asphalt.

[0070] In summary, during production, the recycled asphalt and the original sand and gravel in the first and second regeneration drums are replaced at intervals, which reduces the stickiness of the recycled asphalt on the inner wall of the first regeneration drum and reduces the difficulty of cleaning. The generated asphalt-containing flue gas is completely incinerated in the first and second hot blast furnaces, and the tail gas after removing the asphalt flue gas is discharged along the exhaust gas emission device to avoid the discharge of pollutants. At the same time, the bag in the bag filter can be restored to the service life when only dust-containing exhaust gas is treated. The equipment structure eliminates the vibrating screen and hot material bin structure in the original heating system of the existing intermittent mixing plant, avoids heat dissipation, and is more energy-efficient; it reduces the intermediate links, and the operation and maintenance are simpler. The asphalt mixing plant eliminates the heat screening and heat buffer equipment in the original heating system of the traditional asphalt mixing plant, optimizes the process flow, reduces the equipment cost, and makes it simple to control, while reducing the difficulty of maintenance; the production mode can choose single-drum and double-drum production modes, and the production method is flexible and the production capacity adjustment range is large.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-regeneration drum asphalt mixing plant, comprising a first feeding device (11), a first waste gas recovery device (12), a first discharge end seat (13), a first hot blast furnace (14), a first auxiliary fan (15), and a first burner (16) connected together, wherein the first feeding device (11) is connected to the first waste gas recovery device (12), the air inlet at the upper end of the first discharge end seat (13) is connected to the first hot blast furnace (14), the first burner (16) is arranged above the first hot blast furnace (14), and the first auxiliary fan (15) is arranged on the side of the first hot blast furnace (14), characterized in that: Also includes, a second feeding device (21), a second waste gas recovery device (22), a second discharge end seat (23), a second hot blast furnace (24), a second auxiliary fan (25), and a second burner (26), wherein the second feeding device (21) is connected to the second waste gas recovery device (22), an air inlet at the upper end of the second discharge end seat (23) is connected to the second hot blast furnace (24), a second burner (26) is arranged above the second hot blast furnace (24), a second auxiliary fan (25) is arranged on the side of the second hot blast furnace (24), and, A double regeneration drum component, a metering and stirring component is further provided below the double regeneration drum component, a cross flue component is provided above the double regeneration drum component, and the first waste gas recovery device (12) and the second waste gas recovery device (22) are further connected to a waste gas discharge component; The exhaust gas emission components include a bag filter (3), an induced draft fan (4), a chimney (5), a first exhaust pipe (17) and a second exhaust pipe (27); the first exhaust pipe (17) is connected to a first exhaust gas recovery device (12), the second exhaust pipe (27) is connected to a second exhaust gas recovery device (22), the first exhaust pipe (17) and the second exhaust pipe (27) are interconnected and connected to the bag filter (3), the upper end of the bag filter (3) is connected to the induced draft fan (4), and the upper end of the induced draft fan (4) is connected to the chimney (5).

2. The double-regeneration drum asphalt mixing plant according to claim 1 is characterized in that: The double regeneration drum component comprises a first regeneration drum (18), a second regeneration drum (28), a first drum base and a second drum base; the feed port of the first regeneration drum (18) is connected to the first feed device (11), the discharge port of the first regeneration drum (18) is connected to the air outlet of the first discharge end seat (13), the feed port of the first regeneration drum (18) is also connected to the first exhaust gas recovery device (12), and the first drum base is arranged below the first regeneration drum (18); The feed port of the second regeneration drum (28) is connected to the second feed device (21), the discharge port of the second regeneration drum (28) is connected to the air outlet of the second discharge end seat (23), the feed port of the second regeneration drum (28) is also connected to the second exhaust gas recovery device (22), and the second drum base is arranged below the second regeneration drum (28).

3. The double regeneration drum asphalt mixing plant according to claim 2 is characterized in that: The first regeneration drum (18) and the second regeneration drum (28) are counter-current regeneration drums, and the first regeneration drum (18) and the second regeneration drum (28) rotate in a downward direction in opposite directions.

4. A double regeneration drum asphalt mixing plant according to claim 3, characterized in that: The metering and stirring components include a first buffer bin (19), a second buffer bin (29), a first metering scale (191), a second metering scale (291), a stirring pot (6), a powder scale (7) and an asphalt scale (8); the first buffer bin (19) is connected to a discharge port at the lower end of a first discharge end seat (13); the first metering scale (191) is arranged below the first buffer bin (19); the second buffer bin (29) is connected to a discharge port at the lower end of a second discharge end seat (23); the second metering scale (291) is arranged below the second buffer bin (29); the stirring pot (6) is arranged below the first metering scale (191) and the second metering scale (291); the powder scale (7) and the asphalt scale (8) are arranged on the stirring pot (6); and the powder scale (7) is connected to a bag filter (3) through a pipeline.

5. The double regeneration drum asphalt mixing plant according to claim 4 is characterized in that: The cross flue component includes a first circulating flue (20) and a second circulating flue (30), one end of the first circulating flue (20) is connected to a first auxiliary fan (15), and the other end of the first circulating flue (20) is connected to a first waste gas recovery device (12); one end of the second circulating flue (30) is connected to a second auxiliary fan (25), and the other end of the second circulating flue (30) is connected to a second waste gas recovery device (22), and the first circulating flue (20) and the second circulating flue (30) are connected.

6. The double regeneration drum asphalt mixing plant according to claim 5 is characterized in that: The first circulating flue (20) is provided with a first air return valve (201), the first exhaust pipe (17) is provided with a first exhaust valve (171), the second circulating flue (30) is provided with a second air return valve (301), and the second exhaust pipe (27) is provided with a second exhaust valve (271).

7. The double regeneration drum asphalt mixing plant according to claim 6 is characterized in that: The first buffer bin (19) and the second buffer bin (29) are located eccentrically below the two discharge ports of the double regeneration drum component on the throwing path, and the stirring pot (6) is located directly below the first buffer bin (19) and the second buffer bin (29).

8. The method for using the double-regeneration drum asphalt mixing plant as claimed in claim 7 is characterized in that: The method comprises: S1, first cycle production operation: simultaneously close the second air return valve (301) and the first exhaust valve (171), and open the first air return valve (201) and the second exhaust valve (271), start the first burner (16) and the second burner (26) in the first hot blast furnace (14) and the second hot blast furnace (24), provide circulating exhaust gas through the first auxiliary fan (15) and the second auxiliary fan (25) to preheat the first hot blast furnace (14) and the second hot blast furnace (24), and add the recovered asphalt material into the first regeneration drum (18) through the first feeding device (11); The first regeneration drum (18) is started to perform heat exchange between the recovered asphalt material therein and the high-temperature flue gas introduced from the first hot blast furnace (14), the generated asphalt-containing flue gas is recovered through the first exhaust gas recovery device (12), and the asphalt-containing flue gas is introduced into the first hot blast furnace (14) and the second hot blast furnace (24) for reuse; At the same time, raw sand and gravel are added to the second regeneration drum (28) through the second feeding device (21), and the second regeneration drum (28) operates independently, and the generated exhaust gas enters the exhaust gas discharge component through the second exhaust pipe (27) for purification and discharge; After the reclaimed asphalt material in the first regeneration drum (18) is completely regenerated, it is discharged to the first buffer bin (19) through the first discharge end seat (13) and is measured by the first measuring scale (191); S2, alternating production operation: after the first cycle of production operation is completed, the first air return valve (201) and the second air exhaust valve (271) are closed, and the second air return valve (301) and the first air exhaust valve (171) are opened, and the feeding mode is switched at the same time, raw sand and gravel are added to the first regeneration drum (18), and recycled asphalt is added to the second regeneration drum (28); The second regeneration drum (28) starts to operate, and the asphalt-containing fume generated therein is recovered through the second waste gas recovery device (22), and the asphalt-containing fume is introduced into the first hot blast furnace (14) and the second hot blast furnace (24) for reuse; At this time, the raw material in the first regeneration drum (18) undergoes heat exchange with the high-temperature flue gas introduced from the first hot blast furnace (14), completing the heating process, and the asphalt-containing regeneration material previously adhering to the inner wall of the first regeneration drum (18) is cleaned; After the reclaimed asphalt material in the second regeneration drum (28) is completely regenerated, it is discharged to the second buffer bin (29) through the second discharge end seat (23) and is measured by the second measuring scale (291); S3, mixing and stirring stage: the recycled asphalt in the first and second buffer bins (29) is fed into the mixing pot (6) according to a certain proportion, and appropriate amounts of powder and asphalt are added into the mixing pot (6) through a powder scale (7) and an asphalt scale (8); Starting the stirring pot (6) to mix and stir to obtain a uniform asphalt mixture; Repeat steps S1 to S3 to achieve alternating production of the dual regeneration drums and continuous supply of regenerated asphalt.

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