A mixing and heating device for recycling asphalt concrete

Abstract

The application relates to the field of concrete processing, in particular to a mixing and heating device for recycled asphalt concrete. The mixing and heating device for recycled asphalt concrete comprises a mixing and stirring device arranged on the ground, a flue gas collecting device arranged at the mixing and stirring device and used for collecting flue gas generated by the mixing and stirring device; the flue gas collecting device comprises collecting covers arranged at openings of the mixing and stirring device and a conveying pipeline used for connecting the collecting covers into a whole, a bag-type dust collector arranged at one end of the conveying pipeline away from the collecting covers, the bag-type dust collector being used for generating negative pressure in the collecting covers and the conveying pipeline, and a flue gas pretreatment device arranged in the conveying pipeline and used for removing oil stains in the flue gas, so that the damage of the oil stains to the bag-type dust collector is reduced.

Description

Technical Field

[0001] This application relates to the field of concrete processing, and in particular to a mixing and heating device for recycled asphalt concrete. Background Technology

[0002] Currently, in the production process of recycled asphalt concrete, the heating stage (such as the drying drum and mixing tank) generates a large amount of oil and gas (volatile organic compounds, VOCs) and soot due to the volatilization of asphalt binder and the release of residual lightweight components in RAP (recycled asphalt mixture). Direct emission of these pollutants not only pollutes the environment (harming human health and contributing to smog) but may also pose a fire or explosion risk (oil and gas are flammable). Therefore, efficient oil and gas and soot removal and treatment devices are needed to achieve emission standards (such as GB 16297-1996 "Integrated Emission Standard for Air Pollutants").

[0003] Existing waste gas and dust generated during the baking and heating of old materials enter the flue, and a bag filter is installed at the end of the flue to filter the waste gas and dust discharged from the flue.

[0004] The existing technical solutions mentioned above have the following drawbacks: when the bag filter filters exhaust gas and dust, the oil in the exhaust gas will be adsorbed on the surface of the filter bag, thus forming grease, clogging the filter bag, and affecting the dust removal effect of the filter bag. Utility Model Content

[0005] This application provides a mixing and heating device for recycled asphalt concrete to reduce the damage of oil to bag filters.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0007] A mixing and heating device for recycled asphalt concrete includes a mixing and stirring device installed on the ground, and a flue gas collection device installed at the mixing and stirring device for collecting the flue gas generated by the mixing and stirring device.

[0008] The flue gas collection device includes a collection hood and a conveying pipe. The collection hood is installed at the opening of the mixing and stirring device. The conveying pipe is used to connect the collection hood into a whole. A bag filter is installed at the end of the conveying pipe away from the collection hood. The bag filter is used to generate negative pressure between the collection hood and the conveying pipe. A flue gas pretreatment device is installed inside the conveying pipe. The flue gas pretreatment device is used to remove oil stains in the flue gas.

[0009] Furthermore, the flue gas pretreatment device includes a cooling box and a filter box. The cooling box is used to cool and condense the flue gas, and the filter box is used to filter the cooled flue gas. Both the cooling box and the filter box are fixedly connected to and communicate with the conveying pipeline.

[0010] Furthermore, the cooling box includes a first box body, cooling pipes, and a collector. The first box body is provided with an air inlet pipe and an air outlet pipe, both of which are fixedly connected to the first box body and connected to a conveying pipeline. Several cooling pipes are provided, arranged in a serpentine pattern and connected end to end. The cooling pipes are used to reduce the temperature inside the cooling box and to cool the flue gas passing through the cooling box. The cooling pipes are connected to a coolant circulation device, which is used to continuously supply coolant to the cooling pipes. The collector is located at the bottom of the first box body and is used to collect the oil sludge that settles inside the first box body after cooling.

[0011] Furthermore, the coolant circulation device includes a coolant generator, an input pipe, and an output pipe. The coolant generator is fixedly connected to the first housing, and both the input pipe and the output pipe are fixedly connected to the coolant generator. The input pipe is fixedly connected to one end of the cooling pipe, and the output pipe is fixedly connected to the other end of the cooling pipe.

[0012] Furthermore, the filter box includes a second box body, filter plates, and a box cover. The second box body is provided with a first pipe and a second pipe, both of which are fixedly connected to the second box body. Both the first pipe and the second pipe are connected to and communicate with the conveying pipeline. Several filter plates are provided, which are evenly distributed in the second box body. Each filter plate is perpendicular to the axis of the first pipe and the second pipe. The box cover is located at the top of the second box body and seals the second box body.

[0013] Furthermore, each of the filter plates includes a filter frame, non-woven fabric and activated carbon. There are two filter frames, with two layers of non-woven fabric sandwiched between the two filter frames, and activated carbon filling the space between the two layers of non-woven fabric.

[0014] Furthermore, a snap-fit ​​device is provided between the filter frame and the second housing. The snap-fit ​​device includes a snap-fit ​​groove and a snap-fit ​​block. The snap-fit ​​groove is provided on the second housing. The snap-fit ​​block is fixedly connected to the filter frame and engages with the snap-fit ​​groove.

[0015] Furthermore, a sealing assembly is provided between the lid and the body of the box. The sealing assembly includes a sealing groove and a sealing ring. A sealing groove is provided on the side wall of the body of the box. The lid and the sealing ring are fixedly connected, and the sealing ring and the sealing groove are inserted into each other.

[0016] Furthermore, a rubber pad is provided inside the sealing groove, which is used to seal the gap between the sealing groove and the sealing ring.

[0017] In summary, this application has the following technical effects:

[0018] By setting up a flue gas pretreatment device, the flue gas is first cooled down using a cooling box, which cools the high-temperature flue gas and causes the oil and gas components to change from a gaseous state to a liquid state. The oil portion in the flue gas is condensed in the cooling box, thereby reducing the oil content in the flue gas. Then, the light VOCs in the flue gas are filtered out using a filter box. This means that most of the oil in the flue gas is treated in advance by the pretreatment device, which reduces the damage of oil to the bag filter.

[0019] By setting up a coolant circulation device, the cooling medium is circulated to the cooling pipes in the cooling box, thereby achieving a continuous low temperature in the cooling box and preventing the temperature inside the cooling box from rising, which would reduce the cooling effect on the flue gas.

[0020] By installing filter plates, the cooled flue gas is filtered in multiple stages, allowing oil droplets that did not have time to fall into the cooling box to be filtered at the filter plates, thereby further filtering the oil in the flue gas. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a mixing and heating device for recycled asphalt concrete according to this application;

[0022] Figure 2 This is a schematic diagram of the cooling box structure of this application;

[0023] Figure 3 This is a schematic diagram of the filter box in this application;

[0024] Figure 4 yes Figure 3 A magnified view of part A in the middle;

[0025] Figure 5 yes Figure 3 A magnified view of part B in the diagram.

[0026] In the diagram, 1. Mixing and stirring device; 2. Flue gas collection device; 21. Collection hood; 22. Conveying pipe; 3. Bag filter; 4. Cooling box; 41. First box body; 411. Inlet pipe; 412. Outlet pipe; 42. Cooling pipe; 43. Collector; 5. Coolant circulation device; 51. Coolant generator; 52. Input pipe; 53. Output pipe; 6. Filter box; 61. Second box body; 611. First pipe; 612. Second pipe; 62. Filter plate; 621. Filter frame; 622. Non-woven fabric; 623. Activated carbon; 63. Box cover; 7. Snap-fit ​​device; 71. Snap-fit ​​groove; 72. Snap-fit ​​block; 8. Sealing assembly; 81. Sealing groove; 82. Sealing ring; 9. Rubber gasket. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the accompanying drawings.

[0028] Reference Figure 1 and Figure 2 This embodiment provides a mixing and heating device for recycled asphalt concrete, including a mixing and stirring device 1, which is set on the ground. A flue gas collection device 2 is installed at the mixing and stirring device 1 to collect the flue gas generated by the mixing and stirring device 1. The flue gas collection device 2 includes a collection hood 21 and a conveying pipe 22. The collection hood 21 is installed at the opening of the mixing and stirring device 1. The conveying pipe 22 is used to connect the collection hood 21 into a whole. A bag filter 3 is installed at the end of the conveying pipe 22 away from the collection hood 21. The bag filter 3 is used to generate negative pressure between the collection hood 21 and the conveying pipe 22. A flue gas pretreatment device is installed in the conveying pipe 22 to remove oil stains in the flue gas. The flue gas pretreatment device includes a cooling box 4 and a filter box 6. The cooling box 4 is used to cool and condense the flue gas, and the filter box 6 is used to filter the cooled flue gas. The cooling box 4 and the filter box 6 are both fixedly connected to and communicate with the conveying pipe 22.

[0029] Reference Figure 1 and Figure 2 The cooling box 4 includes a first box body 41, cooling pipes 42, and a collector 43. The first box body 41 is provided with an air inlet pipe 411 and an air outlet pipe 412, both of which are fixedly connected to the first box body 41. Both the air inlet pipe 411 and the air outlet pipe 412 are connected to and communicate with the conveying pipe 22. Several cooling pipes 42 are provided, which are distributed in a serpentine pattern and connected end to end. The cooling pipes 42 are used to reduce the temperature inside the cooling box 4 and to cool the flue gas passing through the cooling box 4. The cooling pipes 42 are connected to a coolant circulation device 5, which is used to continuously deliver coolant to the cooling pipes. The collector 43 is located at the bottom of the first box body 41 and is used to collect the oil sludge that settles inside the first box body 41 after cooling.

[0030] Reference Figure 2 The coolant circulation device 5 includes a coolant generator 51, an input pipe 52, and an output pipe 53. The coolant generator 51 is fixedly connected to the first housing 41. The input pipe 52 and the output pipe 53 are both fixedly connected to the coolant generator 51. The input pipe 52 is fixedly connected to one end of the cooling pipe 42, and the output pipe 53 is fixedly connected to the other end of the cooling pipe 42. In this embodiment, the coolant generator 51 is preferably a water-cooled coolant generator 51. The coolant is cooled to a set temperature by absorbing heat and evaporating the refrigerant (such as Freon or ammonia) in the evaporator. The cold water is then transported to the cooling pipe 42 by a circulation pump to absorb heat from the flue gas. The heated hot water is then returned to the coolant generator 51 for recooling.

[0031] Reference Figure 1 and Figure 3 The filter box 6 includes a second box body 61, filter plates 62, and a box cover 63. The second box body 61 is provided with a first pipe 611 and a second pipe 612, both of which are fixedly connected to the second box body 61. Both the first pipe 611 and the second pipe 612 are connected to and communicate with the conveying pipe 22. Several filter plates 62 are provided, and the several filter plates 62 are evenly distributed in the second box body 61. Each filter plate 62 is perpendicular to the axis of the first pipe 611 and the second pipe 612. The box cover 63 is located at the top of the second box body 61 and seals the second box body 61. Each filter plate 62 includes a filter frame 621, a non-woven fabric 622, and activated carbon 623. There are two filter frames 621, with two layers of non-woven fabric 622 sandwiched between the two filter frames 621, and activated carbon 623 filled between the two layers of non-woven fabric 622.

[0032] Reference Figure 4 and Figure 5 A snap-fit ​​device 7 is provided between the filter frame 621 and the second housing 61. The snap-fit ​​device 7 includes a snap-fit ​​groove 71 and a snap-fit ​​block 72. The snap-fit ​​groove 71 is opened on the second housing 61. The snap-fit ​​block 72 is fixedly connected to the filter frame 621 and snaps into the snap-fit ​​groove 71. A sealing assembly 8 is provided between the housing cover 63 and the housing. The sealing assembly 8 includes a sealing groove 81 and a sealing ring 82. The sealing groove 81 is opened on the side wall of the housing. The housing cover 63 is fixedly connected to the sealing ring 82 and the sealing ring 82 is inserted into the sealing groove 81. A rubber gasket 9 is provided in the sealing groove 81. The rubber gasket 9 is used to seal the gap between the sealing groove 81 and the sealing ring 82.

[0033] The implementation principle of the mixing and heating device for recycled asphalt concrete in this application embodiment is as follows: When using the mild heating device, the mixing and stirring device 1 is first started. The flue gas generated by the mixing and stirring device 1 under the heating state is collected by the collection hood 21. Under the negative pressure generated by the bag filter 3, the high-temperature flue gas is transported through the collection hood 21 to the conveying pipe 22 to reduce the escape of the high-temperature flue gas. The high-temperature flue gas is transported through the conveying pipe 22 to the air inlet pipe 411 and then enters the cooling box 4. Under the action of the cooling pipe 42, the volatile oil (light hydrocarbons) in the flue gas condenses into liquid oil droplets due to the sudden drop in temperature. The liquid oil droplets are separated from the gaseous flue gas and are collected together by the collector 43. The collected liquid oil droplets can be recycled. The cooled flue gas enters the conveying pipe 22 from the outlet pipe 412, and then is conveyed to the first pipe 611 through the conveying pipe 22. After passing through the first pipe 611, it enters the filter plate 62 in the filter box 6. The filter plate 62 filters the flue gas passing through the box, so that small liquid oil droplets in the flue gas that have not yet had time to fall are filtered by the filter plate 62. At the same time, it adsorbs residual volatile organic compounds (VOCs) and fine particulate matter (such as incompletely condensed tiny oil droplets and dust). Finally, the qualified gas is discharged through the bag filter 3. By setting up the cooling box 4, oil droplet dirt can be removed in advance by cooling, and the oil droplets can be recycled and reused, thereby reducing the damage of oil to the bag filter.

[0034] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A mixing and heating device for recycled asphalt concrete, comprising a mixing and stirring device (1), wherein the mixing and stirring device (1) is disposed on the ground, characterized in that: A flue gas collection device (2) is provided at the mixing and stirring device (1), and the flue gas collection device (2) is used to collect the flue gas generated by the mixing and stirring device (1); The flue gas collection device (2) includes a collection hood (21) and a conveying pipe (22). The collection hood (21) is provided at the opening of the mixing and stirring device (1). The conveying pipe (22) is used to connect the collection hood (21) into a whole. A bag filter (3) is provided at the end of the conveying pipe (22) away from the collection hood (21). The bag filter (3) is used to generate negative pressure between the collection hood (21) and the conveying pipe (22). A flue gas pretreatment device is provided inside the conveying pipe (22). The flue gas pretreatment device is used to remove oil stains in the flue gas.

2. The mixing and heating device for recycled asphalt concrete according to claim 1, characterized in that: The flue gas pretreatment device includes a cooling box (4) and a filter box (6). The cooling box (4) is used to cool and condense the flue gas, and the filter box (6) is used to filter the cooled flue gas. Both the cooling box (4) and the filter box (6) are fixedly connected to and communicate with the conveying pipeline (22).

3. The mixing and heating device for recycled asphalt concrete according to claim 2, characterized in that: The cooling box (4) includes a first box body (41), cooling pipes (42), and a collector (43). The first box body (41) is provided with an air inlet pipe (411) and an air outlet pipe (412). Both the air inlet pipe (411) and the air outlet pipe (412) are fixedly connected to the first box body (41). Both the air inlet pipe (411) and the air outlet pipe (412) are connected to and communicate with the conveying pipe (22). Several cooling pipes (42) are provided. The cooling pipes (42) are arranged in a serpentine pattern and connected end to end. The cooling pipes (42) are used to reduce the temperature inside the cooling box (4) and to cool the flue gas passing through the cooling box (4). The cooling pipes (42) are connected to a coolant circulation device (5). The coolant circulation device (5) is used to continuously supply coolant to the cooling pipes. The collector (43) is located at the bottom of the first box (41). The collector (43) is used to collect the oil stains that settle inside the first box (41) after cooling.

4. The mixing and heating device for recycled asphalt concrete according to claim 3, characterized in that: The coolant circulation device (5) includes a coolant generator (51), an input pipe (52) and an output pipe (53). The coolant generator (51) is fixedly connected to the first housing (41). The input pipe (52) and the output pipe (53) are both fixedly connected to the coolant generator (51). The input pipe (52) is fixedly connected to one end of the cooling pipe (42), and the output pipe (53) is fixedly connected to the other end of the cooling pipe (42).

5. The mixing and heating device for recycled asphalt concrete according to claim 2, characterized in that: The filter box (6) includes a second box body (61), filter plates (62) and a box cover (63). The second box body (61) is provided with a first pipe (611) and a second pipe (612). The first pipe (611) and the second pipe (612) are both fixedly connected to the second box body (61). The first pipe (611) and the second pipe (612) are both connected to and communicate with the conveying pipe (22). There are several filter plates (62), which are evenly distributed in the second box body (61). Each filter plate (62) is perpendicular to the axis of the first pipe (611) and the second pipe (612). The box cover (63) is located at the top of the second box body (61) and seals the second box body (61).

6. The mixing and heating device for recycled asphalt concrete according to claim 5, characterized in that: Each of the filter plates (62) includes a filter frame (621), a non-woven fabric (622) and activated carbon (623). There are two filter frames (621), with two layers of non-woven fabric (622) sandwiched between the two filter frames (621) and activated carbon (623) filling the space between the two layers of non-woven fabric (622).

7. The mixing and heating device for recycled asphalt concrete according to claim 6, characterized in that: A snap-fit ​​device (7) is provided between the filter frame (621) and the second housing (61). The snap-fit ​​device (7) includes a snap-fit ​​groove (71) and a snap-fit ​​block (72). The snap-fit ​​groove (71) is opened on the second housing (61). The snap-fit ​​block (72) is fixedly connected to the filter frame (621), and the snap-fit ​​block (72) is snap-fitted into the snap-fit ​​groove (71).

8. The mixing and heating device for recycled asphalt concrete according to claim 5, characterized in that: A sealing assembly (8) is provided between the lid (63) and the box body. The sealing assembly (8) includes a sealing groove (81) and a sealing ring (82). The sealing groove (81) is opened on the side wall of the box body. The lid (63) is fixedly connected to the sealing ring (82), and the sealing ring (82) is inserted into the sealing groove (81).

9. The mixing and heating device for recycled asphalt concrete according to claim 8, characterized in that: A rubber pad (9) is provided inside the sealing groove (81), and the rubber pad (9) is used to seal the gap between the sealing groove (81) and the sealing ring (82).

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