Asphalt plant hot recycling exhaust treatment system and plant

Abstract

The application provides an asphalt mixing station hot regeneration tail gas treatment system and a mixing station, wherein the asphalt mixing station hot regeneration tail gas treatment system comprises a regenerator drying device and a regenerator burner, the regenerator burner is connected with one end of the regenerator drying device, a primary regenerator drying device and a primary regenerator burner, the primary regenerator burner is connected with the primary regenerator drying device, an induced draft fan, an inlet end of the induced draft fan is connected with the other end of the regenerator drying device, a first flue and a second flue, one end of the first flue and one end of the second flue are connected with an outlet end of the induced draft fan, wherein the other end of the first flue is connected with an air inlet end of the regenerator burner, and the other end of the second flue is connected with an air inlet end of the primary regenerator burner. Through the technical scheme, the combustion rate of the regenerator tail gas is effectively improved, the tail gas emission is reduced, the environmental protection performance of the equipment is improved, the overall energy consumption of the equipment is reduced, and the structure of the equipment is simplified.

Description

Technical Field

[0001] This invention relates to the field of asphalt production equipment technology, and more specifically, to an asphalt mixing plant thermal recycling exhaust gas treatment system and a mixing plant. Background Technology

[0002] The hot recycling process at asphalt mixing plants generates a large amount of waste gas, also known as tail gas. This waste gas is typically discharged directly into the front end of the dust removal system of the asphalt mixing equipment. It mixes with dust and asphalt fumes, then passes through a filter bag before being released into the atmosphere. While this structure is simple, it doesn't eliminate harmful substances. In the later stages of production, asphalt fumes can still evaporate from the recycled powder, and the asphalt fumes in the tail gas easily adhere to the filter bags, reducing their permeability and affecting their lifespan.

[0003] Some existing continuous forced mixing asphalt mixture production equipment has two branches for its exhaust gas treatment device. The first branch runs from the exhaust gas chamber at the input end of the recycling dryer, through the first induced draft fan, and then to the output end of the recycling dryer. The second branch runs from the exhaust gas chamber at the input end of the recycling dryer, through the second induced draft fan, and then to the output end of the virgin dryer. With this type of equipment, asphalt dust in the exhaust gas easily adheres to the pipes and induced draft fans, causing blockages. Moreover, only a small portion of the asphalt dust in the exhaust gas participates in combustion, resulting in poor treatment efficiency. In addition, the two branches require two induced draft fans, leading to high overall power consumption, inefficiency, and a relatively complex structure. Summary of the Invention

[0004] The present invention aims to improve at least one of the technical problems existing in the prior art or related art.

[0005] In view of this, one object of the present invention is to provide a thermal recycling exhaust gas treatment system for asphalt mixing plants.

[0006] Another object of the present invention is to provide a mixing plant.

[0007] To achieve the above objectives, the first aspect of the present invention provides a thermal recycling exhaust gas treatment system for an asphalt mixing plant, comprising: a recycling machine drying device and a recycling machine burner, the recycling machine burner being connected to one end of the recycling machine drying device; a virgin machine drying device and a virgin machine burner, the virgin machine burner being connected to the virgin machine drying device; an induced draft fan, the inlet end of which is connected to the other end of the recycling machine drying device; a first flue and a second flue, one end of the first flue and one end of the second flue being connected to the outlet end of the induced draft fan, the other end of the first flue being connected to the air inlet end of the recycling machine burner, and the other end of the second flue being connected to the air inlet end of the virgin machine burner.

[0008] In this technical solution, two flues are connected to the regenerator burner and the virgin burner respectively, allowing the exhaust gas from the regenerator drying unit to be burned again. This facilitates the combustion of more combustible materials in the exhaust gas, improving the incineration and degradation efficiency, reducing pollution, and enhancing the environmental performance of the equipment. Furthermore, the exhaust gas from the regenerator drying unit itself contains a certain amount of oxygen. Sending the exhaust gas through the inlet to the regenerator and virgin burners can serve as combustion air, burning together with fresh air, reducing fresh air consumption. The re-combustion of the exhaust gas also helps reduce the amount of final exhaust gas emitted, further contributing to energy conservation and emission reduction. In addition, this technical solution only requires one induced draft fan, which, compared to existing technologies, reduces the number of components, simplifies the structure, and lowers energy consumption.

[0009] Specifically, the recycling dryer provides a drying space for recycled materials. The recycling burner is connected to the recycling dryer, and the high temperature generated by combustion dries the recycled materials within the dryer. Similarly, the virgin material dryer provides a drying space for virgin materials. The virgin material burner is connected to the virgin material dryer, and the high temperature generated by combustion dries the virgin materials within the dryer. The induced draft fan facilitates the flow of gas within the recycling dryer. On one hand, the gas flow removes moisture, improving drying efficiency; on the other hand, it guides the cooled gas out of the dryer, allowing fresh, high-temperature gas to flow in, thus maintaining the high temperature within the dryer. The recycling burner is located at one end of the drying device, and the induced draft fan at the other end, ensuring proper air circulation. The first and second flues facilitate the diversion of exhaust gas to the recycling burner and the virgin material burner for re-combustion, improving the degradation rate of the exhaust gas and reducing fresh air consumption, thus enhancing the environmental performance of the equipment.

[0010] It should also be noted that when the regenerator burner and the original burner are working, the negative pressure generated by the consumption of air also plays a role in suction, which helps to reduce the power of the induced draft fan and achieves a certain energy-saving effect.

[0011] In the above technical solution, the asphalt mixing plant hot recycling exhaust gas treatment system further includes: a damper, with a damper installed in the first flue and / or the second flue, the opening of which is adjustable; and / or a first blower installed on the burner of the recycling machine; and a second blower installed on the burner of the original machine.

[0012] In any of the above technical solutions, the asphalt mixing plant hot recycling exhaust gas treatment system further includes: a dust removal device, located between the recycling machine drying device and the induced draft fan, wherein the recycling machine drying device is connected to the induced draft fan through the dust removal device.

[0013] In the above technical solution, the dust removal device includes a dust collection box and a cyclone dust collector, with the cyclone dust collector located inside the dust collection box.

[0014] In any of the above technical solutions, the asphalt mixing plant hot recycling exhaust gas treatment system further includes: a furnace, connected to the burner of the recycling machine, the furnace being used to provide a combustion space for fuel; and a third flue, one end of which is connected to the furnace and the other end of which is connected to the drying device of the recycling machine.

[0015] In any of the above technical solutions, the asphalt mixing plant hot recycling exhaust gas treatment system further includes: a discharge box for receiving the dried recycled material, and the discharge box and the induced draft fan or the recycling machine burner are located at the outlet end of the recycling machine drying device.

[0016] In any of the above technical solutions, the asphalt mixing plant hot recycling exhaust gas treatment system further includes: an air inlet device having a first air inlet, a second air inlet, and an air outlet; air inlets are respectively provided on the recycling machine burner and the original machine burner; the first air inlet of the air inlet device on the recycling machine burner is connected to the first flue, and the air outlet of the air inlet device on the recycling machine burner is connected to the recycling machine drying device; the first air inlet of the air inlet device on the original machine burner is connected to the second flue, and the air outlet of the air inlet device on the original machine burner is connected to the original machine drying device.

[0017] In the above technical solution, the air intake device includes a first air duct and a second air duct that are interconnected; one end of the first air duct is inserted into the second air duct, and the other end of the first air duct is provided with a first air inlet, one end of the second air duct is provided with a second air inlet, and the other end of the second air duct is provided with an air outlet; the first air duct is a straight pipe or the end of the first air duct inserted into the second air duct is bent toward the air outlet.

[0018] In the above technical solution, the air intake device includes a first air duct, a second air duct, and a third air duct that are interconnected; the first air duct and the second air duct are respectively connected to the third air duct, the first air duct is provided with a first air inlet, the second air duct is provided with a second air inlet, and the third air duct is provided with an air outlet.

[0019] The second aspect of the present invention provides a mixing plant, comprising: a feeding device for conveying recycled material; and an asphalt mixing plant thermal recycling exhaust gas treatment system according to any one of the first aspects above, wherein the recycled material drying device and the feeding device of the asphalt mixing plant thermal recycling exhaust gas treatment system are connected.

[0020] In this technical solution, the asphalt mixing plant thermal recycling exhaust gas treatment system adopting any of the above technical solutions achieves all the beneficial effects of the above technical solutions, which will not be elaborated here.

[0021] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0022] Figure 1 This is a front view structural schematic diagram of an asphalt mixing plant thermal recycling exhaust gas treatment system according to an embodiment of the present invention;

[0023] Figure 2 This is a front view structural schematic diagram of an asphalt mixing plant thermal recycling exhaust gas treatment system according to an embodiment of the present invention;

[0024] Figure 3 This is a front view structural schematic diagram of an asphalt mixing plant thermal recycling exhaust gas treatment system according to an embodiment of the present invention;

[0025] Figure 4 This is a cross-sectional view of an air intake device according to an embodiment of the present invention;

[0026] Figure 5 This is a cross-sectional view of an air intake device according to an embodiment of the present invention;

[0027] Figure 6 This is a cross-sectional view of an air intake device according to an embodiment of the present invention;

[0028] Figure 7 This is a cross-sectional structural schematic diagram of an air intake device according to an embodiment of the present invention.

[0029] in, Figures 1 to 7 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0030] 100 Regenerator Drying Unit, 102 Regenerator Burner, 104 First Blower, 106 Exhaust Gas Chamber, 108 Dust Collector Box, 110 Exhaust Fan, 112 First Flue, 114 Air Damper, 116 Third Flue, 118 Furnace, 120 Discharge Box, 200 Raw Machine Drying Unit, 202 Raw Machine Burner, 204 Second Blower, 212 Second Flue, 300 Air Inlet Device, 302 First Air Duct, 304 First Air Inlet, 306 Second Air Duct, 308 Second Air Inlet, 310 Air Outlet, 312 Third Air Duct, 314 Flange. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0033] The following reference Figures 1 to 7 Some embodiments of the present invention are described below.

[0034] like Figure 1 As shown, an embodiment of the asphalt mixing plant thermal recycling exhaust gas treatment system proposed according to the present invention is used in a mixing plant and includes: a regenerator drying device 100, a regenerator burner 102, a virgin machine drying device 200, a virgin machine burner 202, an induced draft fan 110, a first flue 112, and a second flue 212.

[0035] Specifically, the virgin burner 202 is connected to the virgin dryer 200; the regenerator burner 102 is connected to one end of the regenerator dryer 100; the inlet end of the induced draft fan 110 is connected to the other end of the regenerator dryer 100, the outlet end of the induced draft fan 110 is connected to one end of the first flue 112, the outlet end of the induced draft fan 110 is also connected to one end of the second flue 212, the other end of the first flue 112 is connected to the air inlet end of the regenerator burner 102, and the other end of the second flue 212 is connected to the air inlet end of the virgin burner 202.

[0036] In this embodiment, by connecting the first flue 112 to the air inlet of the regenerator burner 102 and the second flue 212 to the air inlet of the virgin burner 202, the exhaust gas from the regenerator drying device 100 can be burned again. This facilitates the combustion of more combustible substances in the exhaust gas, improves the incineration and degradation efficiency of the exhaust gas, reduces pollution, and enhances the environmental performance of the equipment. In addition, the exhaust gas from the regenerator drying device 100 itself contains a certain amount of oxygen. By sending it into the regenerator burner 102 and the virgin burner 202 through the air inlet, it can serve as combustion air, burning together with fresh air, reducing the consumption of fresh air. Furthermore, the re-combustion of the exhaust gas helps reduce the amount of exhaust gas emitted in the final emission, further contributing to energy conservation and consumption reduction.

[0037] It should also be noted that this embodiment only has one induced draft fan 110, which reduces the number of components compared to the prior art, thus simplifying the structure and reducing energy consumption.

[0038] Furthermore, the regenerator burner 102 is equipped with a first blower 104, and the virgin burner 202 is equipped with a second blower 204. This allows the first blower 104 to draw air into the regenerator burner 102, further improving the combustion efficiency within the regenerator burner 102, and the second blower 204 to draw air into the virgin burner 202, further improving the combustion efficiency within the virgin burner 202. Moreover, the arrangement of the first blower 104 and the second blower 204 also helps the induced draft fan 110 draw air from the regenerator drying device 100, reducing the total pressure of the induced draft fan 110 and thus reducing its power consumption, further achieving energy-saving goals.

[0039] In the above embodiment, the asphalt mixing plant thermal recycling exhaust gas treatment system further includes: a damper 114, which is located in the first flue 112. The opening of the damper 114 is adjustable to adjust the distribution ratio of exhaust gas between the regenerator burner 102 and the original burner 202, thereby improving the flexibility of equipment use.

[0040] In other embodiments, the damper 114 may also be provided in the second flue 212, or the damper 114 may be provided in both the first flue 112 and the second flue 212.

[0041] In any of the above embodiments, the asphalt mixing plant hot recycling exhaust gas treatment system further includes a dust removal device, which is located between the recycling machine drying device 100 and the induced draft fan 110. The recycling machine drying device 100 is connected to the induced draft fan 110 through the dust removal device to remove dust in the exhaust gas, reduce the phenomenon of dust adhering to the pipeline and the induced draft fan 110 and causing blockage, and improve the exhaust gas emission efficiency.

[0042] Furthermore, the dust removal device includes a dust collection box 108 and a cyclone dust collector. The cyclone dust collector is located inside the dust collection box 108. Using a cyclone dust collector is beneficial for filtering out large particles of dust that are easily adhered to in the exhaust gas, further reducing clogging and extending the service life of various components in the equipment. The dust collection box 108 is designed to accommodate the cyclone dust collector and also to prevent exhaust gas or dust from overflowing.

[0043] In other embodiments, the dust removal device is not limited to a cyclone dust collector, but may be any one or more of an inertial dust collector, a spray tower, a scrubber, an impact dust collector, a granular bed dust collector, a bag filter, and an electrostatic precipitator.

[0044] like Figure 1 As shown, in some embodiments, an exhaust gas chamber 106 is provided between the cyclone dust collector and the regenerator drying device 100 to collect exhaust gas.

[0045] It is understandable that the regenerator drying device 100 and the regenerator burner 102 can be directly connected together, or they can be separated and connected through devices such as flues.

[0046] like Figure 2 As shown, in any of the above embodiments, the asphalt mixing plant hot recycling exhaust gas treatment system further includes: a furnace 118 and a third flue 116, and the regenerator drying device 100 and the regenerator burner 102 are connected through the furnace 118 and the third flue 116.

[0047] Specifically, the furnace 118 is connected to the regenerator burner 102. The furnace 118 provides combustion space for the fuel, ensuring that the flame does not directly contact the recycled material in the regenerator drying device 100 during combustion, thus preventing the recycled material from melting. One end of the third flue 116 is connected to the furnace 118, and the other end is connected to the regenerator drying device 100. This allows the regenerator burner 102 and the regenerator drying device 100 to maintain a certain distance from each other, rather than being directly connected. In particular, the arrangement of the third flue 116 allows for more flexible relative positioning of the regenerator burner 102 and the regenerator drying device 100. They can be positioned horizontally, vertically, or at an angle, and the distance between them can also be flexibly adjusted. This also facilitates the flexible layout of other components in the asphalt mixing plant's hot recycling exhaust gas treatment system. Furthermore, it allows for flexible orientation of the furnace 118, enabling it to be positioned horizontally or vertically.

[0048] It is understandable that the third flue 116 sends the high-temperature air heated by the regenerator burner 102 into the regenerator drying device 100 in order to dry the recycled material.

[0049] In any of the above embodiments, the positions of the induced draft fan 110 and the regenerator drying device 100 can be interchanged, so that the flow direction of the exhaust gas is opposite to or the same as the flow direction of the recycled material. That is, the induced draft fan 110 can be set at the inlet end of the regenerator drying device 100 or it can be set at the inlet end of the regenerator drying device 100.

[0050] Specifically, such as Figure 2 As shown, the asphalt mixing plant hot recycling exhaust gas treatment system also includes: a discharge box 120, located at the outlet end of the recycling machine drying device 100, to receive the dried recycled material; an induced draft fan 110 connected to the outlet end of the recycling machine drying device 100 through the discharge box 120 and the dust collector box 108, and a recycling machine burner 102 connected to the inlet end of the recycling machine drying device 100 through the furnace 118 and the third flue 116, with the flow direction of the recycled material and the flow direction of the exhaust gas being the same.

[0051] like Figure 3 As shown, with Figure 2 The embodiment shown is different. The induced draft fan 110 is set at the inlet end of the regenerator drying device 100. That is, the induced draft fan 110 is connected to the outlet end of the regenerator drying device 100 through the dust collector box 108. The regenerator burner 102 is connected to the outlet end of the regenerator drying device 100 through the furnace 118 and the third flue 116. The discharge box 120 is set at the outlet end of the regenerator drying device 100. The flow direction of the recycled material is opposite to the flow direction of the exhaust gas.

[0052] like Figure 4 As shown, in any of the above embodiments, the asphalt mixing plant hot recycling exhaust gas treatment system further includes: an air inlet device 300 having a first air inlet 304, a second air inlet 308, and an air outlet 310; air inlets 300 are respectively provided on the recycling burner 102 and the original burner 202; the first air inlet 304 of the air inlet device 300 on the recycling burner 102 is connected to the first flue 112, and the air outlet 310 of the air inlet device 300 on the recycling burner 102 is connected to the recycling dryer 100; the first air inlet 304 of the air inlet device 300 on the original burner 202 is connected to the second flue 212, and the air outlet 310 of the air inlet device 300 on the original burner 202 is connected to the original dryer 200.

[0053] In this embodiment, by providing an air intake device 300, which has a first air inlet 304, a second air inlet 308, and an air outlet 310, it is convenient to introduce exhaust gas for combustion through the first air inlet 304 and fresh air through the second air inlet 308, ensuring sufficient oxygen supply in the regenerator burner 102 and the virgin burner 202. The air outlet 310 can introduce the mixed exhaust gas and fresh air into the regenerator burner 102 or the virgin burner 202. Furthermore, the air intake device 300 has a simple structure and is easy to manufacture and assemble.

[0054] like Figure 4 As shown, in the above embodiment, the air inlet device 300 includes a first air duct 302 and a second air duct 306 that are interconnected; one end of the first air duct 302 is inserted into the second air duct 306, and the other end of the first air duct 302 is provided with a first air inlet 304; one end of the second air duct 306 is provided with a second air inlet 308, and the other end of the second air duct 306 is provided with an air outlet 310; the end of the first air duct 302 inserted into the second air duct 306 is bent toward the air outlet 310.

[0055] In this embodiment, the air intake device 300 includes a first air duct 302 and a second air duct 306. One end of the first air duct 302 is inserted radially into the second air duct 306 from its circumference, and the other end of the first air duct 302 is provided with a first air inlet 304. This allows the exhaust gas to enter the more central position of the second air duct 306 directly through the end of the first air duct 302 inserted into the second air duct 306, thus facilitating mixing with the fresh air entering through the second air inlet 308. The exhaust gas is then sent into the regenerator burner 102 or the virgin burner 202 through the air outlet 310. The end of the first air duct 302 inserted into the second air duct 306 bends towards the air outlet 310, which helps the exhaust gas or tail gas to approach the air outlet 310. The flow direction of the exhaust gas is consistent with the flow direction of the fresh air entering through the second air inlet, making it easier for the exhaust gas or tail gas to flow to the air outlet 310 and reducing the flow resistance to the fresh air.

[0056] It is understandable that the bending method of the first duct 302 can be as follows: Figure 4 As shown, it bends in an arc shape, meaning the bend is arc-shaped; it can also be like... Figure 5 As shown, the pipe wall at the bend is polygonal, or rather, the pipe wall at the bend has multiple sides that resemble a polygon.

[0057] like Figure 6 As shown, in some other embodiments, the first duct 302 is a straight pipe, which is inserted radially into the second duct 306 from the circumference of the second duct 306, and the opening of the end of the first duct 302 inserted into the second duct 306 is set as an oblique opening and faces the air outlet 310 so that the exhaust air flows to the air outlet 310.

[0058] like Figure 7 As shown, in some other embodiments, the air inlet device 300 includes a first air duct 302, a second air duct 306, and a third air duct 312 that are interconnected. The first air duct 302 and the second air duct 306 are respectively connected to the third air duct 312. The first air duct 302 is connected to the circumferential surface of the second air duct 306 and is arranged radially along the second air duct 306. The first air duct 302 is provided with a first air inlet 304, the second air duct 306 is provided with a second air inlet 308, and the third air duct 312 is provided with an air outlet 310. The second air duct 306 and the third air duct 312 are arranged coaxially, so that the axes of the second air inlet 308 and the air outlet 310 are on the same straight line, which helps to reduce the resistance of airflow. Furthermore, the second air duct 306 is inserted into the third air duct 312.

[0059] In this embodiment, the first air inlet 304, the second air inlet 308, and the air outlet 310 are respectively set on three air ducts, which has a simple structure and clear division of labor.

[0060] In any of the above embodiments, flanges 314 are provided at the first air inlet 304, the second air inlet 308, and the air outlet 310 of the air inlet device 300 to facilitate the connection of the air inlet device 300 with other components.

[0061] An embodiment of the second aspect of the present invention provides a mixing plant, comprising: a feeding device for conveying recycled material; and an asphalt mixing plant thermal recycling exhaust gas treatment system according to any embodiment of the first aspect above, wherein the recycled material drying device and the feeding device of the asphalt mixing plant thermal recycling exhaust gas treatment system are connected.

[0062] In this embodiment, by adopting the asphalt mixing plant thermal recycling exhaust gas treatment system of any of the above embodiments, all the beneficial effects of the above embodiments are achieved, which will not be repeated here.

[0063] The asphalt mixing plant thermal recycling exhaust gas treatment system according to a specific embodiment of this application can improve the following problems:

[0064] 1) Asphalt dust in the exhaust gas adheres to the pipeline and induced draft fan 110, causing blockage problems;

[0065] 2) The combustion efficiency of asphalt fumes in the exhaust gas of the recycling machine;

[0066] 3) Energy saving issues in the exhaust gas transportation process of the regenerator.

[0067] The technical solution adopted in this specific embodiment is as follows:

[0068] 1) A cyclone dust collector is installed between the exhaust chamber 106 and the induced draft fan 110 to filter out large particles of dust that are easy to adhere to.

[0069] 2) The exhaust gas from the regenerator is delivered to the air inlets of the virgin burner 202 and the regenerator burner 102 respectively, and mixed with the combustion air before being sent into the center of the flame to maximize the combustion and degradation of the asphalt soot.

[0070] 3) The asphalt mixing plant's hot recycling exhaust gas treatment system uses a single induced draft fan 110. The fan 110 outlet is divided into two branches, which connect to the air inlets of the primary combustion engine burner 202 and the recycling engine burner 102, respectively. A damper 114 is installed on the connecting pipe of the induced draft fan 110 to the recycling engine burner 102 branch to control the airflow distribution between the two branches. In addition to relying on the induced draft fan 110, the recycling engine exhaust gas is also transported using the suction capacity of the burner blower, which reduces the total pressure of the induced draft fan 110 and lowers its power consumption. The recycling engine exhaust gas typically contains 10% oxygen, which can be used as combustion air for the burners, reducing the consumption of fresh air. For the recycling engine drying unit 100, the total input fresh air + return exhaust gas volume is minimized, and the total output exhaust gas volume is also minimized.

[0071] The specific implementation method is as follows:

[0072] like Figure 1 As shown, the thermal recycling exhaust gas treatment system of the recycled asphalt mixing plant includes: a recycled machine drying device 100, an exhaust gas chamber 106, a cyclone dust collector 108, an induced draft fan 110, an air damper 114, a first flue 112, a recycled machine burner 102, a second flue 212, a virgin machine burner 202, and a virgin machine drying device 200. The exhaust gas generated by the recycled machine drying device 100 is collected in the exhaust gas chamber 106 and connected to the cyclone dust collector 108. Large dust particles are filtered out in the cyclone dust collector 108. The outlet end of the cyclone dust collector 108 is connected to the inlet end of the induced draft fan 110. The outlet end of the induced draft fan 110 is connected to the flue. The flue is divided into two branches: the first flue 112 and the second flue 212.

[0073] The first flue 112 is connected to the air inlet device 300 of the regenerator burner 102, and the second flue 212 is connected to the air inlet device 300 of the virgin burner 202. A damper 114 is provided on the first flue 112 for use as exhaust gas distribution control between the two branches.

[0074] The air inlet device 300 of the primary burner 202 / regenerator burner 102 has a three-way structure, such as... Figure 4 As shown, the device includes a first duct 302, a second duct 306, and a flange 314. The first duct 302 extends into the second duct 306, turns at a 90° bend, and extends a distance towards the air outlet 310, maintaining concentricity with the second duct 306. The three interfaces are a first air inlet 304, a second air inlet 308, and an air outlet 310. The first air inlet 304 serves as the exhaust gas inlet, the second air inlet 308 serves as the fresh air inlet, and the air outlet 310 connects to the inlet of either the first blower 104 or the second blower 204. The flange 314 of the air inlet device 300 is used for connection to other devices.

[0075] This specific embodiment has the following advantages:

[0076] 1) Installing a cyclone dust collector can filter out large particles of dust that are easy to adhere to, reducing the blockage of pipelines and fans;

[0077] 2) The exhaust gas from the regenerator is delivered to the air inlets of the virgin and regenerator burners respectively, mixed with fresh air, and then sent into the center of the flame to maximize the combustion and degradation of the asphalt soot in the exhaust gas, resulting in better environmental protection.

[0078] 3) In addition to relying on the induced draft fan, the exhaust gas from the recycling machine also utilizes the suction capacity of the burner blower, which can reduce the total pressure of the induced draft fan and lower power consumption. The exhaust gas from the recycling machine typically contains 10% oxygen, which can be used as combustion air for the burner, reducing the consumption of fresh air. For the recycling machine drying unit, the total input fresh air + return exhaust gas volume is minimized, and the total output exhaust gas volume is also minimized. The overall power consumption of the thermal recycling exhaust gas treatment system in the recycled asphalt mixing plant is minimized.

[0079] like Figure 1 As shown, the regenerator burner 102 and the regenerator drying device 100 are arranged as a single unit; as Figure 2 and Figure 3 As shown, the regenerator burner 102 and the regenerator drying device 100 can also be arranged separately. Specifically, the regenerator burner 102 completes combustion in the furnace 118, and the high-temperature exhaust gas generated is connected to the regenerator drying device 100 through the third flue 116, where the recycled asphalt material is dried by heating with the high-temperature exhaust gas. The furnace 118 can be arranged horizontally or vertically. Figure 2 and Figure 3 This is a schematic diagram of the separate arrangement of the regenerator burner 102 and the regenerator drying device 100.

[0080] It should also be noted that the regenerator burner 102 and the regenerator drying device 100 are arranged separately, which can be applied not only to co-current regenerators but also to counter-current regenerators.

[0081] like Figure 2 As shown, in the drying unit of the co-current recycling machine, the flow pattern of the recycled asphalt material is consistent with the flow direction of the high-temperature exhaust gas. Figure 3 This is a schematic diagram of a counter-current regenerator structure, such as... Figure 3 As shown, in the drying device of the counter-current recycling machine, the flow direction of the recycled asphalt material is opposite to the flow direction of the high-temperature exhaust gas.

[0082] The technical solution of the present invention has been described in detail above with reference to the accompanying drawings. Through the technical solution of the present invention, the combustion rate of the exhaust gas of the regenerator is effectively improved, the exhaust gas emissions are reduced, the environmental performance of the equipment is improved, the overall energy consumption of the equipment is reduced, and the structure of the equipment is simplified.

[0083] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0084] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0085] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0086] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An asphalt plant hot recycling offgas treatment system, characterized by, The system comprises: a regenerator dryer (100) and a regenerator burner (102) connected to one end of the regenerator dryer (100); a primary dryer (200) and a primary burner (202) connected to the primary dryer (200); an induced draft fan (110) connected to the other end of the regenerator dryer (100); a first flue (112) and a second flue (212), one end of the first flue (112) and one end of the second flue (212) are connected to the outlet end of the induced draft fan (110), the other end of the first flue (112) is connected to the air inlet end of the regenerator burner (102), and the other end of the second flue (212) is connected to the air inlet end of the primary burner (202); a first air blower (104) arranged on the regenerator burner (102); a second air blower (204) arranged on the primary burner (202); a dust removal device arranged between the regenerator dryer (100) and the induced draft fan (110), the regenerator dryer (100) is connected to the induced draft fan (110) through the dust removal device; The flow direction of the regenerated material is opposite to the flow direction of the tail gas.

2. The asphalt plant hot recycling off gas treatment system of claim 1, wherein, Further comprising: a damper (114) arranged in the first flue (112) and / or the second flue (212), the opening degree of the damper (114) is adjustable.

3. The asphalt mixing plant hot recycling tail gas treatment system according to claim 1, wherein The dust removal device comprises a dust removal box (108) and a cyclone dust collector arranged in the dust removal box (108).

4. The asphalt plant hot recycling offgas treatment system of claim 1 or 2, wherein, Further comprising: a furnace (118) connected to the regenerator burner (102); a third flue (116) connected to the furnace (118) at one end and connected to the regenerator dryer (100) at the other end.

5. The asphalt plant hot recycling offgas treatment system of claim 1 or 2, wherein, Further comprising: a discharge box (120) for receiving the dried regenerated material, the discharge box (120) is arranged at the outlet end of the regenerator dryer (100) and connected to the induced draft fan (110) or the regenerator burner (102).

6. The asphalt plant hot recycling offgas treatment system of claim 1 or 2, wherein, Further comprising: an air inlet device (300) having a first air inlet (304), a second air inlet (308) and an air outlet (310); The air inlet device (300) is arranged on the regenerator burner (102) and the primary burner (202) respectively; The first air inlet (304) of the air inlet device (300) on the regenerator burner (102) is connected to the first flue (112), and the air outlet (310) of the air inlet device (300) on the regenerator burner (102) is connected to the regenerator dryer (100). The first air inlet (304) of the air inlet device (300) on the original machine combustor (202) is connected with the second flue (212), and the air outlet (310) of the air inlet device (300) on the original machine combustor (202) is connected with the original machine drying device (200).

7. The asphalt plant hot recycling offgas treatment system of claim 6, wherein, The air inlet device (300) comprises a first air pipe (302) and a second air pipe (306) in communication with each other; One end of the first air pipe (302) is inserted into the second air pipe (306), and the other end of the first air pipe (302) is provided with the first air inlet (304), one end of the second air pipe (306) is provided with the second air inlet (308), and the other end of the second air pipe (306) is provided with the air outlet (310); The first air pipe (302) is a straight pipe or the end of the first air pipe (302) inserted into the second air pipe (306) is bent towards the air outlet (310).

8. The asphalt plant hot recycling offgas treatment system of claim 6, wherein, The air inlet device (300) comprises a first air pipe (302), a second air pipe (306) and a third air pipe (312) in communication with each other; The first air pipe (302) and the second air pipe (306) are respectively connected with the third air pipe (312), the first air pipe (302) is provided with the first air inlet (304), the second air pipe (306) is provided with the second air inlet (308), and the third air pipe (312) is provided with the air outlet (310).

9. A mixing plant, characterized in that comprising: a feeding device for conveying the recycled material; The asphalt plant hot recycling offgas treatment system of any one of claims 1-8, wherein the recycled material drying device of the asphalt plant hot recycling offgas treatment system is connected with the feeding device.

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