Environment-friendly and energy-saving sand and gravel drying device and multifunctional drying system

Abstract

The utility model provides a kind of sandstone material drying device and multifunctional drying system of environmental protection and energy saving, a kind of sandstone material drying device of environmental protection and energy saving, including drying cylinder, burner and driving motor, it is characterized by: the drying cylinder is divided into guide area and heat exchange area along its central axis upward;The end of the heat exchange area away from the guide area is connected with combustion hearth, the end of the combustion hearth away from the heat exchange area is equipped with burner, the outer surface of the drying cylinder is equipped with the drag ring, the side of drag ring is equipped with the driving motor corresponding to drive drying cylinder rotation.Drying cylinder is divided into guide area and heat exchange area, by completely canceling the material area that traditional drying cylinder is equipped with, reduce the length of drying cylinder and reduce the power of driving motor, to reduce the energy consumption of drying cylinder in the process of rotation.

Description

Technical Field

[0001] This utility model relates to the field of asphalt mixture production technology, and more specifically to an environmentally friendly and energy-saving sand and gravel drying device and a multi-functional drying system. Background Technology

[0002] Asphalt mixture is a core material in road construction. It is made by mixing asphalt, coarse aggregate, fine aggregate, mineral powder and other materials in a specific ratio. In the production of asphalt mixture, the drying drum is a key piece of equipment.

[0003] Traditional asphalt mixing equipment uses a drying drum for drying sand and gravel, as described in Chinese utility model patent CN208533323 U, which is typically divided into a material guiding zone, a heat exchange zone, and a material-containing zone. The material-containing zone uses material-containing blades to wrap around the sand and gravel, which are continuously lifted and slid down with the blades in the material-containing zone, thus preventing the burner flame from directly contacting the sand and gravel and affecting the combustion effect.

[0004] Although the structure can prevent the mixture from aging, the length of the material-containing zone is half the length of the drying drum, which increases the manufacturing cost of the equipment. The process of sand and gravel being repeatedly lifted and slid down in the material-containing blades does not participate in effective heat exchange, but requires a lot of driving energy.

[0005] In addition, asphalt fumes (i.e., recycling waste gas) are generated during the recycling and heating process of recycled asphalt mixtures. If the asphalt fumes are not effectively treated, they will cause serious environmental pollution. Utility Model Content

[0006] This utility model provides an environmentally friendly and energy-saving sand and gravel drying device and a multi-functional drying system, which aims to solve the shortcomings of existing drying drums, such as high energy consumption in the material-containing zone, resulting in high driving power of the entire drying drum and increased manufacturing costs.

[0007] The present invention adopts the following technical solution:

[0008] An environmentally friendly and energy-saving sand and gravel drying device includes a drying drum, a burner, and a drive motor. The drying drum is divided into a material guiding zone and a heat exchange zone along its central axis. The end of the heat exchange zone away from the material guiding zone is connected to the combustion furnace. The end of the combustion furnace away from the heat exchange zone is equipped with a burner. A drag ring is fitted on the outer surface of the drying drum, and a drive motor for driving the drying drum to rotate is correspondingly provided on the side of the drag ring.

[0009] Furthermore, the power output end of the drive motor is connected to a trolley, and the outer contour of the trolley contacts the outer contour of the trolley ring.

[0010] Furthermore, one end of the drying drum is connected to the feed box, and the other end is connected to the discharge box. The combustion furnace is connected to the drying drum through the discharge box.

[0011] Furthermore, a multi-functional drying system includes an exhaust gas treatment device and an environmentally friendly and energy-saving sand and gravel drying device. The exhaust gas treatment device includes an exhaust gas emission pipe, an exhaust gas recovery pipe, and a regenerated waste gas pipe. The upper end of the feed box is connected to a three-way flue. One end of the three-way flue is connected to a bag filter dust collector through the exhaust gas emission pipe, and the other end is connected to the exhaust gas recovery pipe. The end of the exhaust gas recovery pipe is connected to the combustion furnace. A variable frequency return air fan and a shut-off damper are installed on the exhaust gas recovery pipe. The combustion furnace is also connected to the regenerated waste gas pipe, which is equipped with a shut-off damper.

[0012] Furthermore, the exhaust pipe is equipped with a regulating damper.

[0013] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following advantages:

[0014] 1. The sand and gravel drying device of this utility model has a drying drum divided into a material guiding zone and a heat exchange zone. By completely eliminating the material-containing zone of the traditional drying drum, reducing the length of the drying drum and reducing the power of the drive motor, the energy consumption of the drying drum during rotation is reduced.

[0015] 2. This utility model's multi-functional drying system connects a three-way flue to the feed box. One end directs the exhaust gas into a bag filter for treatment, while the other end, via a variable frequency return fan and a shut-off damper, directs the exhaust gas into the combustion furnace. This process cools and maintains the furnace while simultaneously recovering and utilizing the waste heat from the exhaust gas. The combustion furnace is also equipped with a connecting regeneration waste gas pipeline, which has a second shut-off damper to select whether the regeneration waste gas is utilized. By switching between the two shut-off dampers, two operating modes can be selected: drying and heating only the raw sand and gravel, or combining the drying system with other processes.

[0016] 3. The exhaust gas discharge pipe of this utility model is equipped with a regulating damper, which can adjust the amount of exhaust gas flow to meet the negative pressure requirements of the drying system. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model.

[0018] Figure 2 This is a structural schematic diagram of Embodiment 2 of the present invention. Detailed Implementation

[0019] The specific embodiments of this utility model are described below. To provide a comprehensive understanding of this utility model, many details are described below; however, those skilled in the art can implement this utility model without these details. Well-known components, methods, and processes will not be described in detail below.

[0020] Example 1

[0021] An environmentally friendly and energy-saving sand and gravel drying device, referring to Figure 1 The system includes a drying drum 10, a burner 20, and a drive motor 30. The drying drum 10 is divided into a material guiding zone 101 and a heat exchange zone 102 along its central axis. The material guiding zone 101 is equipped with a set of material guiding blades, which includes multiple circumferentially distributed material guiding blades. The heat exchange zone 102 is equipped with multiple spaced-apart lifting blades. One side of the drying drum 10 is connected to a feed box 40, and the other side is connected to a discharge box 50. The drying drum 10 is connected to a combustion furnace 60 through the discharge box 50. The burner 20 is installed at the end of the combustion furnace 60 away from the discharge box 50.

[0022] Continue to refer to Figure 1 Two drag rings 103 are spaced apart on the outer surface of the drying drum 10. Each drag ring 103 has a drive motor 30 on its side that drives the drying drum 10 to rotate. Each drive motor 30 has a drive wheel 104 connected to its power output end. The outer contour of each drive wheel 104 is in contact with the outer contour of the drag ring 103.

[0023] The aforementioned drying drum 10 includes only a material guiding zone 101 and a heat exchange zone 102. Compared with traditional drying drums, by completely eliminating the material-containing zone, reducing the length of the drying drum 10, and reducing the power of the drive motor 30, the energy consumption of the drying drum 10 during rotation is reduced.

[0024] Example 2

[0025] Reference Figure 2 A multifunctional drying system includes an exhaust gas treatment device 70 and an environmentally friendly and energy-saving sand and gravel drying device as described in Embodiment 1. The exhaust gas treatment device 70 includes an exhaust gas emission pipe 710, an exhaust gas recovery pipe 720, and a regenerated waste gas pipe 730.

[0026] The upper end of the feed box 40 is connected to a three-way flue pipe 401. One end of the three-way flue pipe 401 is connected to the bag filter dust collection system through the exhaust gas emission pipe 710, and the other end is connected to the exhaust gas recovery pipe 720. The end of the exhaust gas recovery pipe 720 is connected to the combustion furnace 60. The exhaust gas recovery pipe 720 is equipped with a variable frequency return air fan 80 and a shut-off damper 721. The combustion furnace 60 is also connected to the regeneration waste gas pipe 730, which is equipped with a shut-off damper 731.

[0027] The exhaust pipe 710 is equipped with a regulating damper 711, which can adjust the exhaust gas flow rate to meet the negative pressure requirements of the drying system 10.

[0028] Continue to refer to Figure 2The aforementioned multi-functional drying system switches between the following two production modes by switching two shut-off dampers:

[0029] 1. When the drying system only dries and heats raw sand and gravel: simply open the first shut-off damper 721 and close the second shut-off damper 731; by opening the regulating damper 711, the raw material enters the drying drum 10 from the feed box 40, is conveyed to the heat exchange zone 102 through the guide zone 101, and is directly heated by the flame of the burner 20. Part of the generated asphalt fumes enter the bag filter dust collection system for treatment; part of them are drawn into the combustion furnace 60 by the variable frequency return air fan 80 for secondary combustion.

[0030] 2. When the drying system is in combined production, producing both raw sand and gravel and treating the waste gas (i.e., asphalt fumes) generated by the recycling equipment, the second shut-off damper 731 is opened, the first shut-off damper 721 is closed, and the regulating damper 711 is opened. The regenerated waste gas (i.e., asphalt fumes) enters the combustion furnace 60 through the regenerated waste gas pipe 730. The high-temperature flue gas enters the drying drum 10 from the outlet of the combustion furnace 60. After heating the raw material, the regenerated waste gas is treated by the bag filter dust collection system.

[0031] When the drying system only dries and heats the raw sand and gravel, the waste heat of the exhaust gas is recovered by the variable frequency return air fan 80, which can reduce the fuel consumption of the combustion furnace and avoid excessive heat loss in the combustion furnace. When the drying system is used for combined production, the regenerated waste gas enters the combustion furnace 60 through the regenerated waste gas pipeline 730 for secondary combustion, which can effectively degrade pollutants and reduce pollution to the ecological environment. By switching the two shut-off dampers, two operating modes can be selected.

[0032] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. An environmentally friendly and energy-saving sand and gravel drying device, comprising a drying drum, a burner, and a drive motor, characterized in that: The drying drum is divided into a material guiding zone and a heat exchange zone along its central axis. The end of the heat exchange zone away from the material guiding zone is connected to the combustion furnace. A burner is installed at the end of the combustion furnace away from the heat exchange zone. A drag ring is fitted on the outer surface of the drying drum, and a drive motor for driving the drying drum to rotate is correspondingly provided on the side of the drag ring.

2. The sand drying device according to claim 1, characterized in that: The power output end of the drive motor is connected to a trolley, and the outer contour of the trolley contacts the outer contour of the trolley ring.

3. The environmentally friendly and energy-saving sand and gravel drying device according to claim 1, characterized in that: One end of the drying drum is connected to the feed box, and the other end is connected to the discharge box. The combustion furnace is connected to the drying drum through the discharge box.

4. A multifunctional drying system, characterized in that: The invention includes an exhaust gas treatment device and an environmentally friendly and energy-saving sand and gravel drying device as described in claim 3. The exhaust gas treatment device includes an exhaust gas emission pipe, an exhaust gas recovery pipe, and a regenerated waste gas pipe. The upper end of the feed box is connected to a three-way flue. One end of the three-way flue is connected to a bag filter dust collection system through the exhaust gas emission pipe, and the other end is connected to the exhaust gas recovery pipe. The end of the exhaust gas recovery pipe is connected to the combustion furnace. A variable frequency return air fan and a shut-off damper are installed on the exhaust gas recovery pipe. The combustion furnace is also connected to the regenerated waste gas pipe, which is equipped with a shut-off damper.

5. The multifunctional drying system according to claim 4, characterized in that: The exhaust pipe is equipped with a regulating damper.

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