Asphalt mixing plant exhaust cooling and recovery system

Abstract

The present application relates to waste gas treatment technical field, specifically disclose a kind of asphalt mixing station waste gas cooling recovery system, including top end closed setting inner tube body and the outer tube body of setting in the outer tube body outside, annular fluid passage is formed between the inner tube body and outer tube body, the bottom end of the outer tube body is closed setting, the top end of the outer tube body is installed with shielding ring, the inner wall of the shielding ring and the outer circumferential side of inner tube body are fixedly connected, the bottom end of the inner tube body is equipped with several grooves, the top end of the inner tube body is equipped with air inlet hole, rotatable shaft is installed in the middle position of outer tube body inner chamber bottom side, coaxial annular frame is fixed on the shaft, the bottom end of the annular frame is fixed with several vertical rods around its axis at equal angle, air inlet is equipped in the position of outer tube body outer circumferential side close to the top end of outer tube body, the technical scheme of the present application example, system resistance is smaller, energy consumption is low, and without frequently replacing consumables, operating cost is low.

Description

Technical Field

[0001] This invention relates to the manufacture of special equipment for air pollution prevention and environmental protection, and particularly to the field of waste gas treatment technology, specifically a waste gas cooling and recovery system for asphalt mixing plants. Background Technology

[0002] During the asphalt heating and mixing process, asphalt mixing plants generate asphalt fumes with complex components, including hydrocarbon derivatives, dust, and tar droplets. If these asphalt fumes are directly released into the air, they will pose a serious threat to the health of operators and nearby residents, and will also pollute the atmospheric environment.

[0003] Electrostatic precipitators are used to treat asphalt fumes. The high-voltage electric field in the electrostatic precipitator charges the dust and tar droplets in the asphalt fumes, which are then captured by the electrode plates under the action of the electric field. The recovered tar can be returned to the production system or used as fuel. However, the tar and dust on the electrode plates are highly adhesive and difficult to clean.

[0004] When using baghouse dust collectors to treat asphalt fumes, the filter bags are prone to clogging, requiring frequent replacement and resulting in high maintenance costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide an asphalt mixing plant exhaust gas cooling and recovery system with low system resistance, low energy consumption, no need for frequent replacement of consumables, and low operation and maintenance costs.

[0006] The technical solution adopted by this invention to solve its technical problem includes: On one hand, an asphalt mixing plant exhaust gas cooling and recovery system is provided, including an inner pipe body with a closed top and an outer pipe body sleeved outside the inner pipe body. An annular fluid channel is formed between the inner pipe body and the outer pipe body. The bottom end of the outer pipe body is closed. A shielding ring is installed on the top end of the outer pipe body. The inner wall of the shielding ring is fixedly connected to the outer periphery of the inner pipe body. Several slots are opened at the bottom end of the inner pipe body. An air inlet is opened at the top end of the inner pipe body.

[0007] A rotatable shaft is installed at the middle position of the bottom side of the inner cavity of the outer tube. A coaxial ring frame is fixed on the shaft. Several vertical rods are fixed at equal angles around the bottom of the ring frame around its axis. An air inlet is opened on the outer periphery of the outer tube near the top of the outer tube.

[0008] The outer tube is filled with liquid, and the groove is located inside the liquid. The vertical rod can slide along the groove on the inner wall of the inner tube.

[0009] As a preferred embodiment of the present invention, a guide tube is installed on the inner wall of the inner tube, the guide tube is sleeved on the rotating shaft, a spiral blade is fixed on the rotating shaft, one end of the guide tube is closed, the outer edge of the spiral blade slides against the inner wall of the guide tube, a first opening is provided on the guide tube, a second opening is provided on the inner tube, and the first opening and the second opening are connected by a connecting tube.

[0010] As a preferred embodiment of the present invention, one end of the guide tube is closed and located at the bottom end of the guide tube, a limiting plate is installed on the rotating shaft, the limiting plate is located above the guide tube, and the distance between the limiting plate and the guide tube is 2.0mm-10.0mm.

[0011] As a preferred embodiment of the present invention, a number of droplet separation plates are fixed at equal angles around the rotation axis on the inner wall of the outer tube near the air inlet of the outer tube.

[0012] The path of the gas flowing through the droplet separation plate is a tortuous path.

[0013] As a preferred embodiment of the present invention, the air inlet of the outer tube is connected to the air inlet of the blower, and a drive mechanism for driving the rotating shaft is installed on the outer tube.

[0014] In a preferred embodiment of the present invention, the slot is triangular or arc-shaped.

[0015] As a preferred embodiment of the present invention, the vertical rod is made of elastic metal or elastic plastic.

[0016] On the other hand, an asphalt mixing plant exhaust gas cooling and recovery system is also provided, including an inner pipe body with a closed top and an outer pipe body sleeved outside the inner pipe body. An annular fluid channel is formed between the inner pipe body and the outer pipe body. The bottom end of the outer pipe body is closed. A shielding ring is installed on the top end of the outer pipe body. The inner wall of the shielding ring is fixedly connected to the outer periphery of the inner pipe body. Several slots are opened at the bottom end of the inner pipe body. An air inlet is opened at the top end of the inner pipe body.

[0017] The inner tube has a guide tube fixed to its inner wall by a fixing seat. A rotatable shaft is installed at the middle position of the bottom side of the inner cavity of the outer tube. The bottom end of the guide tube is closed. The shaft passes through the closed end of the guide tube, through the inner cavity of the guide tube, and extends to the outside of the guide tube. A spiral blade is fixed at the position of the shaft inside the guide tube. The outer edge of the spiral blade slides against the inner wall of the guide tube. A first opening is provided on the guide tube, and a second opening is provided on the inner tube. The first opening and the second opening are connected by a connecting pipe. An air inlet is provided on the outer periphery of the outer tube near the top of the outer tube.

[0018] The outer tube is filled with liquid, and the groove on the inner tube is located inside the liquid.

[0019] As a preferred embodiment of the present invention, a number of droplet separation plates are fixed at equal angles around the rotation axis on the inner wall of the outer tube near the air inlet of the outer tube.

[0020] The path of the gas flowing through the droplet separation plate is a tortuous path.

[0021] As a preferred embodiment of the present invention, the air inlet of the outer tube is connected to the air inlet of the blower, and a drive mechanism for rotating the shaft is installed on the outer tube. The slot is triangular or arc-shaped.

[0022] Compared with the prior art, the beneficial effects of the present invention are: 1. The asphalt mixing plant exhaust gas cooling and recovery system of the present invention has low system resistance, low energy consumption of the induced draft fan, and does not require frequent replacement of consumables. It only requires periodic treatment of wastewater, resulting in low operation and maintenance costs.

[0023] 2. In the asphalt mixing plant exhaust gas cooling and recovery system of this invention, the exhaust gas in the inner pipe enters the liquid in the fluid channel through a slot, forming bubbles in the liquid in the fluid channel, increasing the contact area between the exhaust gas and the liquid. Dust and tar particles in the bubbles collide with the bubble wall under inertial or gravitational settling and are captured by the water. The vertical rod continuously cuts the air passing through the slot, making the bubbles in the liquid in the fluid channel smaller in volume, increasing the contact opportunity between the dust and tar particles in the bubbles and the bubble wall, thereby improving the efficiency of tar recovery from the exhaust gas.

[0024] 3. In the asphalt mixing plant exhaust gas cooling and recovery system of this invention, the rotating spiral blades cause the liquid in the fluid channel to continuously flow into the inner pipe through the guide pipe. The inner pipe is continuously replenished with liquid, and the liquid in the inner pipe flows into the fluid channel through the slot. On the one hand, the liquid flowing through the slot continuously washes the inner wall of the slot, avoiding clogging and improving the reliability of the exhaust gas cooling and recovery system of this asphalt mixing plant. On the other hand, the continuous replenishment of liquid into the inner pipe causes the liquid level in the inner pipe to fluctuate, making the volume of the bubbles formed in the fluid channel smaller. Furthermore, the liquid in the inner pipe is sprayed out through the gap between the limiting plate and the guide pipe. The sprayed liquid impacts the inner wall of the inner pipe, forming a liquid mist in the inner pipe. The liquid mist mixes with the exhaust gas in the inner pipe, further improving the efficiency of tar recovery from the exhaust gas.

[0025] 4. In the asphalt mixing plant exhaust gas cooling and recovery system of this invention, the rotating spiral blades cause the liquid in the fluid channel to continuously flow into the inner pipe through the connecting pipe and the guide pipe. The inner pipe is continuously replenished with liquid, and the liquid level in the inner pipe fluctuates continuously, causing the volume of the bubbles formed in the fluid channel to decrease. This asphalt mixing plant exhaust gas cooling and recovery system has low system resistance, low energy consumption, and does not require frequent replacement of consumables. It only requires periodic wastewater treatment, resulting in low operation and maintenance costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an embodiment of the present invention; Figure 2 for Figure 1 A partial sectional view of the structure; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A; Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point B; Figure 5 This is a schematic diagram of the droplet separation plate structure of the present invention.

[0027] In the diagram: 1. Air inlet, 2. Inner tube, 3. Outer tube, 4. Exhaust fan, 5. Limiting plate, 6. Guide tube, 7. Rotating shaft, 8. Spiral blade, 9. First opening, 10. Slot, 11. Drive mechanism, 12. Droplet separation plate, 13. Shielding ring, 14. Connecting pipe, 15. Second opening, 16. Ring frame, 17. Vertical rod. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] Example 1: Please refer to Figures 1-4 This embodiment discloses an asphalt mixing plant exhaust gas cooling and recovery system, including an inner pipe 2 with a closed top and an outer pipe 3 sleeved outside the inner pipe 2. An annular fluid channel is formed between the inner pipe 2 and the outer pipe 3. The bottom end of the outer pipe 3 is closed. The bottom end of the inner pipe 2 is located inside the outer pipe 3. A shielding ring 13 is installed on the top end of the outer pipe 3. The inner wall of the shielding ring 13 is fixedly connected to the outer periphery of the inner pipe 2. Several slots 10 are opened at the bottom end of the inner pipe 2, and an air inlet 1 is opened at the top end of the inner pipe 2.

[0030] A rotatable shaft 7 is installed at the middle position of the bottom side of the inner cavity of the outer tube body 3. A coaxial ring frame 16 is fixed on the shaft 7 by a positioning frame. Several vertical rods 17 are fixed at equal angles around the bottom of the ring frame 16 around its axis. An air inlet is opened on the outer periphery of the outer tube body 3 near the top of the outer tube body 3.

[0031] The outer tube 3 is filled with liquid, and the slot 10 is located in the liquid. The vertical rod 17 can slide against the position where the slot 10 is opened on the inner wall of the inner tube 2.

[0032] Furthermore, the air inlet of the outer pipe 3 is connected to the air inlet of the blower 4. The outer pipe 3 is equipped with a drive mechanism 11 that drives the rotating shaft 7 to rotate. The drive mechanism 11 is an electric motor or a hydraulic motor. The blower 4 and drive mechanism 11 used in this invention are common equipment in the prior art. Their working methods and structures are well known technologies and will not be described in detail here.

[0033] The working process and principle of this embodiment are as follows: The operator adds liquid into the outer pipe 3. The liquid level in the outer pipe 3 is higher than the groove 10. The height difference between the liquid level in the outer pipe 3 and the groove 10 is greater than 10.0 cm. The air inlet 1 is connected to the exhaust port of the asphalt mixing plant. The drive mechanism 11 drives the vertical rod 17 to rotate through the rotating shaft 7 and the ring frame 16.

[0034] The operator activates the induced draft fan 4, which draws gas from the fluid channel. This reduces the gas pressure in the fluid channel, causing the liquid level to rise and the liquid level in the inner tube 2 to fall. When the liquid level in the inner tube 2 is not higher than the upper part of the slot 10 and the depth of the liquid in the fluid channel is greater than 1.0m, the exhaust gas in the inner tube 2 enters the liquid in the fluid channel through the slot 10, forming bubbles that increase the contact area between the exhaust gas and the liquid. Dust and tar particles in the bubbles collide with the bubble walls under inertial or gravitational settling forces and are captured by the water. The heat from the gas in the bubbles is transferred to the liquid, cooling the exhaust gas. The bubbles in the fluid channel then move upward and detach from the liquid.

[0035] The vertical rod 17 slides against the groove 10 on the inner wall of the inner tube 2. The vertical rod 17 continuously cuts the air passing through the groove 10, making the air bubbles in the liquid in the fluid channel smaller. This increases the chance of dust and tar particles in the bubbles coming into contact with the bubble wall, thereby improving the efficiency of tar recovery from the exhaust gas.

[0036] The exhaust gas cooling and recovery system of this asphalt mixing plant has low system resistance, low energy consumption of the induced draft fan 4, and does not require frequent replacement of consumables. It only requires periodic wastewater treatment, resulting in low operation and maintenance costs.

[0037] Furthermore, the vertical rod 17 is made of elastic metal or elastic plastic, and it bends continuously during rotation to prevent dirt from forming on the vertical rod 17.

[0038] Furthermore, the slot 10 is triangular or arc-shaped.

[0039] Furthermore, the liquid is water or mineral oil.

[0040] Example 2: Figure 2 and Figure 3 As shown, this embodiment discloses an asphalt mixing plant exhaust gas cooling and recovery system, whose structure is roughly the same as that of Embodiment 1. The difference is that in this embodiment, a guide tube 6 is installed on the inner wall of the inner tube body 2 through a positioning seat. The guide tube 6 is sleeved on the rotating shaft 7, and a spiral blade 8 is fixed on the rotating shaft 7. One end of the guide tube 6 is closed. The outer edge of the spiral blade 8 slides and fits against the inner wall of the guide tube 6. A first opening 9 is opened on the guide tube 6, and a second opening 15 is opened on the inner tube body 2. The first opening 9 and the second opening 15 are connected through a connecting pipe 14.

[0041] The working process and principle of this embodiment are as follows: The operator adds liquid into the outer pipe 3, and the liquid level in the outer pipe 3 is higher than that in the slot 10. The inner cavity of the connecting pipe 14 is filled with liquid. The drive mechanism 11 drives the spiral blade 8 to rotate through the rotating shaft 7. The rotating spiral blade 8 causes the liquid in the fluid channel to flow continuously into the inner pipe 2 through the guide pipe 6. Liquid is continuously added to the inner pipe 2. The liquid in the inner pipe 2 flows into the fluid channel through the slot 10. The liquid flowing through the slot 10 continuously flushes the inner wall of the slot 10, preventing the slot 10 from becoming blocked and improving the reliability of the exhaust gas cooling and recovery system of this asphalt mixing plant.

[0042] Furthermore, the rotating helical blades 8 cause the liquid in the fluid channel to continuously flow into the inner tube 2 through the connecting pipe 14 and the guide pipe 6. The inner tube 2 is continuously replenished with liquid, and the liquid level in the inner tube 2 fluctuates continuously, causing the volume of the bubbles formed in the fluid channel to decrease.

[0043] Example 3: Figure 2 and Figure 3 As shown, this embodiment discloses an asphalt mixing plant exhaust gas cooling and recovery system, whose structure is roughly the same as that of Embodiment 2. The difference is that in this embodiment, one end of the guide pipe 6 is closed and located at the bottom end of the guide pipe 6, and a limiting plate 5 is installed on the rotating shaft 7. The limiting plate 5 is located above the guide pipe 6, and the distance between the limiting plate 5 and the guide pipe 6 is 2.0mm-10.0mm.

[0044] The working process and principle of this embodiment are as follows: The rotating helical blades 8 cause the liquid in the fluid channel to continuously flow into the inner tube 2 through the connecting pipe 14 and the guide pipe 6. The liquid in the inner tube 2 is sprayed out through the gap between the limiting plate 5 and the guide pipe 6. The sprayed liquid impacts the inner wall of the inner tube 2, forming a liquid mist inside the inner tube 2. The liquid mist mixes with the waste gas inside the inner tube 2, further improving the efficiency of tar recovery from the waste gas.

[0045] Example 4: Figure 2 , Figure 3 and Figure 5 As shown, this embodiment discloses an asphalt mixing plant exhaust gas cooling and recovery system, whose structure is roughly the same as that of Embodiment 1. The difference is that in this embodiment, several droplet separation plates 12 are fixed at equal angles around the rotating shaft 7 on the inner wall of the outer pipe 3 near the air inlet of the outer pipe 3.

[0046] The path of the gas flowing through the droplet separation plate 12 is a bend.

[0047] The working process and principle of this embodiment are as follows: After the bubbles in the fluid channel detach from the liquid, they form upward-flowing gas. As the gas flows through the droplet separation plate 12, the droplets in the gas collide with the droplet separation plate 12, and the droplets gather on the droplet separation plate 12, thus achieving the separation of droplets in the gas. This facilitates the subsequent adsorption and purification of the gas in the fluid channel by activated carbon.

[0048] Example 5: Figure 2 As shown, this embodiment discloses an asphalt mixing plant exhaust gas cooling and recovery system, whose structure is roughly the same as that of Embodiment 4. The difference is that the droplet separation plate 12 is replaced with a metal wire ball in this embodiment.

[0049] The working process and principle of this embodiment are as follows: After the bubbles in the liquid channel detach from the liquid, they form upward-flowing gas. As the gas flows through the metal wire, the droplets in the gas collide with the metal wire, and the droplets in the gas gather on the metal wire, thus achieving the separation of droplets in the gas. This facilitates the subsequent adsorption and purification of the gas in the fluid channel by activated carbon.

[0050] Example 6: Figures 1-4 As shown, this embodiment discloses an asphalt mixing plant exhaust gas cooling and recovery system. This embodiment includes an inner pipe 2 with a closed top and an outer pipe 3 sleeved outside the inner pipe 2. An annular fluid channel is formed between the inner pipe 2 and the outer pipe 3. The bottom end of the outer pipe 3 is closed. The bottom end of the inner pipe 2 is located inside the outer pipe 3. A shielding ring 13 is installed on the top end of the outer pipe 3. The inner wall of the shielding ring 13 is fixedly connected to the outer periphery of the inner pipe 2. Several slots 10 are opened at the bottom end of the inner pipe 2, and an air inlet 1 is opened at the top end of the inner pipe 2.

[0051] A guide tube 6 is fixed to the inner wall of the inner tube body 2 by a positioning seat. A rotating shaft 7 is installed in the middle of the bottom side of the inner cavity of the outer tube body 3 by a bearing seat. The bottom end of the guide tube 6 is closed. The top end of the rotating shaft 7 passes through the closed end of the guide tube 6, passes through the inner cavity of the guide tube 6 and extends to the outside of the guide tube 6. A spiral blade 8 is fixed at the position of the rotating shaft 7 inside the guide tube 6. The outer edge of the spiral blade 8 slides and fits against the inner wall of the guide tube 6. A first opening 9 is opened on the guide tube 6. A second opening 15 is opened on the inner tube body 2. The first opening 9 and the second opening 15 are connected by a connecting pipe 14. An air inlet is opened on the outer periphery of the outer tube body 3 near the top end of the outer tube body 3.

[0052] The outer tube 3 is filled with liquid, and the slot 10 on the inner tube 2 is located inside the liquid.

[0053] Furthermore, the air inlet of the outer tube 3 is connected to the air inlet of the blower 4, and a drive mechanism 11 that drives the rotating shaft 7 to rotate is installed on the outer tube 3. The slot 10 is triangular or arc-shaped.

[0054] The working process and principle of this embodiment are as follows: The operator adds liquid into the outer pipe 3. The liquid level in the outer pipe 3 is higher than the groove 10. The inner cavity of the connecting pipe 14 is filled with liquid. The height difference between the liquid level in the outer pipe 3 and the groove 10 is greater than 10.0 cm. The air inlet 1 is connected to the exhaust port of the asphalt mixing plant. The drive mechanism 11 drives the vertical rod 17 to rotate through the rotating shaft 7 and the ring frame 16.

[0055] The operator activates the induced draft fan 4, which draws gas from the fluid channel. The gas pressure in the fluid channel decreases, the liquid level in the fluid channel rises, and the liquid level in the inner tube 2 drops. When the upper part of the slot 10 is exposed, the exhaust gas in the inner tube 2 enters the liquid in the fluid channel through the slot 10, forming bubbles in the liquid. The bubbles move upward and then detach from the liquid, increasing the contact area between the exhaust gas and the liquid. Dust and tar particles in the bubbles collide with the bubble wall under inertial or gravitational settling action and are thus captured by the water.

[0056] The rotating helical blades 8 cause the liquid in the fluid channel to continuously flow into the inner pipe body 2 through the connecting pipe 14 and the guide pipe 6. The inner pipe body 2 is continuously replenished with liquid, and the liquid level in the inner pipe body 2 fluctuates continuously, causing the volume of the bubbles formed in the fluid channel to decrease. The system resistance of the exhaust gas cooling and recovery system of this asphalt mixing plant is small, the energy consumption of the induced draft fan 4 is low, and there is no need to frequently replace consumables. Only wastewater needs to be treated periodically, resulting in low operation and maintenance costs.

[0057] Furthermore, the slot 10 is triangular or arc-shaped.

[0058] Furthermore, when the liquid level inside the inner tube 2 is not higher than the upper part of the groove 10, the depth of the liquid in the fluid channel is greater than 1.0m.

[0059] Furthermore, the liquid is water or mineral oil.

[0060] Example 7: Figure 2 , Figure 3 and Figure 5 As shown, this embodiment discloses an asphalt mixing plant exhaust gas cooling and recovery system, whose structure is roughly the same as that of Embodiment 1. The difference is that in this embodiment, several droplet separation plates 12 are fixed at equal angles around the rotating shaft 7 on the inner wall of the outer pipe 3 near the air inlet of the outer pipe 3.

[0061] The path of the gas flowing through the droplet separation plate 12 is a bend.

[0062] The working process and principle of this embodiment are as follows: After the bubbles in the fluid channel detach from the liquid, they form upward-flowing gas. As the gas flows through the droplet separation plate 12, the droplets in the gas collide with the droplet separation plate 12, and the droplets gather on the droplet separation plate 12, thus achieving the separation of droplets in the gas. This facilitates the subsequent adsorption and purification of the gas in the fluid channel by activated carbon.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A cooling and recovery system for exhaust gas from an asphalt mixing plant, characterized in that: The device includes an inner tube (2) with its top closed and an outer tube (3) sleeved outside the inner tube (2). An annular fluid channel is formed between the inner tube (2) and the outer tube (3). The bottom end of the outer tube (3) is closed. A shielding ring (13) is installed on the top end of the outer tube (3). The inner wall of the shielding ring (13) is fixedly connected to the outer periphery of the inner tube (2). Several slots (10) are opened at the bottom end of the inner tube (2). An air inlet (1) is opened at the top end of the inner tube (2). A rotatable shaft (7) is installed at the middle position of the bottom side of the inner cavity of the outer tube (3). A coaxial ring frame (16) is fixed on the shaft (7). Several vertical rods (17) are fixed at equal angles around the bottom of the ring frame (16) around its axis. An air inlet is opened on the outer periphery of the outer tube (3) near the top of the outer tube (3). The outer tube (3) is filled with liquid, and the slot (10) is located in the liquid. The vertical rod (17) can slide against the position where the slot (10) is opened on the inner wall of the inner tube (2). The inner tube (2) is fitted with a guide tube (6) on its inner wall. The guide tube (6) is sleeved on the rotating shaft (7). A spiral blade (8) is fixed on the rotating shaft (7). One end of the guide tube (6) is closed. The outer edge of the spiral blade (8) slides against the inner wall of the guide tube (6). A first opening (9) is provided on the guide tube (6). A second opening (15) is provided on the inner tube (2). The first opening (9) and the second opening (15) are connected by a connecting tube (14).

2. The asphalt mixing plant exhaust gas cooling and recovery system according to claim 1, characterized in that: One end of the guide tube (6) is closed and located at the bottom end of the guide tube (6). A limiting plate (5) is installed on the rotating shaft (7). The limiting plate (5) is located above the guide tube (6), and the distance between the limiting plate (5) and the guide tube (6) is 2.0mm-10.0mm.

3. The asphalt mixing plant exhaust gas cooling and recovery system according to claim 2, characterized in that: Several droplet separation plates (12) are fixed at equal angles around the rotating shaft (7) on the inner wall of the outer tube (3) near the air inlet of the outer tube (3). The path through which the gas flows through the droplet separation plate (12) is a bend.

4. The asphalt mixing plant exhaust gas cooling and recovery system according to claim 3, characterized in that: The air inlet of the outer tube (3) is connected to the air inlet of the blower (4), and a drive mechanism (11) for driving the rotating shaft (7) to rotate is installed on the outer tube (3).

5. The asphalt mixing plant exhaust gas cooling and recovery system according to claim 4, characterized in that: The slot (10) is triangular or arc-shaped.

6. The asphalt mixing plant exhaust gas cooling and recovery system according to claim 5, characterized in that: The vertical rod (17) is made of elastic metal or elastic plastic.

7. A cooling and recovery system for exhaust gas from an asphalt mixing plant, characterized in that: The device includes an inner tube (2) with its top closed and an outer tube (3) sleeved outside the inner tube (2). An annular fluid channel is formed between the inner tube (2) and the outer tube (3). The bottom end of the outer tube (3) is closed. A shielding ring (13) is installed on the top end of the outer tube (3). The inner wall of the shielding ring (13) is fixedly connected to the outer periphery of the inner tube (2). Several slots (10) are opened at the bottom end of the inner tube (2). An air inlet (1) is opened at the top end of the inner tube (2). The inner wall of the inner tube (2) is fixed with a guide tube (6) by a fixing seat. A rotatable shaft (7) is installed at the middle position of the bottom side of the inner cavity of the outer tube (3). The bottom end of the guide tube (6) is closed. The shaft (7) passes through the closed end of the guide tube (6), passes through the inner cavity of the guide tube (6) and extends to the outside of the guide tube (6). A spiral blade (8) is fixed at the position of the shaft (7) inside the guide tube (6). The outer edge of the spiral blade (8) slides against the inner wall of the guide tube (6). A first opening (9) is opened on the guide tube (6). A second opening (15) is opened on the inner tube (2). The first opening (9) and the second opening (15) are connected by a connecting pipe (14). An air inlet is opened on the outer periphery of the outer tube (3) near the top of the outer tube (3). The outer tube (3) is filled with liquid, and the slot (10) on the inner tube (2) is located in the liquid.

8. The asphalt mixing plant exhaust gas cooling and recovery system according to claim 7, characterized in that: Several droplet separation plates (12) are fixed at equal angles around the rotating shaft (7) on the inner wall of the outer tube (3) near the air inlet of the outer tube (3). The path through which the gas flows through the droplet separation plate (12) is a bend.

9. The asphalt mixing plant exhaust gas cooling and recovery system according to claim 7, characterized in that: The air inlet of the outer tube (3) is connected to the air inlet of the blower (4). The outer tube (3) is equipped with a drive mechanism (11) that drives the rotating shaft (7) to rotate. The slot (10) is triangular or arc-shaped.

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