Asphalt flue gas composite purification device

Abstract

The utility model relates to the technical field of flue gas treatment equipment, and discloses an asphalt flue gas composite purification device which comprises an electrical tar precipitator, a washing tower, a first fan, a second fan and a circulating pump, a circulating water tank is fixedly connected to the bottom of the washing tower, and the input end of the first fan and the output end of the electrical tar precipitator are fixedly connected with a first flue gas pipe; the output end of the first fan and the washing tower are fixedly connected with a second smoke pipe, the input end of the second fan and the output end of the washing tower are fixedly connected with a first gas pipe, and the output end of the second fan is fixedly connected with a second gas pipe. Through pretreatment of the electrical tar precipitator and rotational flow enhanced purification of the washing tower, the asphalt flue gas treatment effect is greatly improved, meanwhile, a rotational flow mechanism is arranged in the washing tower, tobacco pipe shunting and an annular shunting cover cigarette spraying nozzle are matched with a spiral flow deflector to force flue gas to spirally rise, the retention time is prolonged, the gas-liquid contact efficiency is improved, and it is ensured that the flue gas makes full contact with spraying liquid; and finally, pollutants such as polycyclic aromatic hydrocarbon and asphalt mist are efficiently removed.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas treatment equipment, and in particular to a composite purification device for asphalt flue gas. Background Technology

[0002] Asphalt fumes are a mixture of pollutants, including polycyclic aromatic hydrocarbons and asphalt mist, that are produced during the heating, stirring, and other processing of asphalt. They are complex in composition and toxic and carcinogenic, which not only endangers the health of operators but also causes air pollution. Therefore, they need to be treated in a targeted manner to achieve emission standards.

[0003] Currently, the treatment of flue gas generated during asphalt production mainly employs electrostatic capture (ESC) or spray scrubbing. ESC utilizes a high-voltage electric field to ionize and charge pollutants in the asphalt flue gas, causing them to adhere to electrode plates and achieve gas-solid separation. Spray scrubbing removes large particulate dust and harmful components from the flue gas. For example, the existing Chinese utility model patent CN220257540U discloses a flue gas scrubbing tower. This application includes a tower body and a balance tank. The top of the tower body has an inlet pipe with a spray head extending into one end. The lower part of the tower body has an air inlet pipe, and the upper part has an air outlet pipe. The bottom of the tower body... The bottom of the unit is connected to the balance tank via a pipe. The balance tank has a liquid outlet pipe at the top. When the flue gas is treated by spraying, the flue gas enters the spray tower from the bottom. The open space inside the tower causes uneven flue gas flow rate, which can easily lead to local airflow short circuits. Some flue gas is discharged without fully contacting the spray liquid. Especially when the flue gas flow rate is too fast, flooding will occur. The spray liquid cannot form a uniform liquid film on the surface of the packing material and is instead carried away by the airflow, resulting in insufficient gas-liquid contact. The liquid film on the surface of the packing material cannot be fully contacted, so the pollutants cannot be effectively absorbed, resulting in a local decline in the quality of flue gas treatment. Utility Model Content

[0004] The purpose of this invention is to provide a composite purification device for asphalt fume, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A composite purification device for asphalt fume includes an electrostatic precipitator, a scrubbing tower, a first fan and a second fan, and a circulating pump. A circulating water tank is fixedly connected to the bottom of the scrubbing tower. A first smoke pipe is fixedly connected to the input end of the first fan and the output end of the electrostatic precipitator. A second smoke pipe is fixedly connected to the output end of the first fan and the scrubbing tower. A first air pipe is fixedly connected to the input end of the second fan and the output end of the scrubbing tower. A second air pipe is fixedly connected to the output end of the second fan. The circulating pump, the circulating water tank, and the spray mechanism inside the scrubbing tower are interconnected via connecting pipes. A swirling mechanism is installed inside the scrubbing tower. The swirling mechanism includes a hopper and a connecting frame. Several annular connecting seats are fixedly connected to the hopper. Several annular protective covers are fixedly connected to the connecting frame. A fixing ring is fixedly connected inside each annular protective cover, and an annular diverter is fixedly connected to each fixing ring.

[0007] As a further preferred embodiment of this utility model, the bottom of the washing tower extends into the circulating water tank and has several water inlets, so that the spray water in the washing tower enters the circulating water tank and is circulated by the circulating pump.

[0008] As a further preferred embodiment of this utility model, one end of the second flue passes through the scrubbing tower and is fixedly connected to the lower end of the flue, so that the flue gas treated by the electrostatic precipitator is diverted through the flue into several annular diversion hoods.

[0009] As a further preferred embodiment of this utility model, the pipe is provided with a plurality of first water leakage channels and second water leakage channels, and the first water leakage channels and second water leakage channels are connected to each other. The top of the pipe is provided with a plurality of air inlet channels, and the diameter of the plurality of air inlet channels gradually increases from the center point of the top of the pipe outward. The opening of the first water leakage channels and second water leakage channels allows the spray water in the washing tower to fall onto the pipe, and then fall into the bottom of the washing tower and enter the circulating water tank through the first water leakage channels and second water leakage channels. The air inlet channels allow the smoke entering the pipe to enter the corresponding annular diverter.

[0010] As a further preferred embodiment of this utility model, the inner and outer diameters of the top of the annular connecting seat are fixedly connected with insert rings, and the inner cavity of the annular connecting seat is connected to the cavity inside the pipe through the corresponding air inlet channel. This allows the annular diverter to connect the annular diverter to the pipe cavity after it is installed in the washing tower through the annular cover and connecting frame.

[0011] As a further preferred embodiment of this utility model, a spiral guide plate is fixedly connected to the inner side of the annular cover, so that the flue gas impacting the inner side of the annular cover is guided and rises in a spiral state into the scrubbing tower, reducing the rising speed of the flue gas and improving the reaction quality between the flue gas and the spray water. Several water leakage holes are opened in the fixed ring, which allow the spray water entering between the annular diverter and the annular cover to fall onto the pipe and be discharged into the circulating water tank through the first water leakage channel and the second water leakage channel. The water leakage holes are opened at an angle, which is opposite to the angle of the nozzle, thus preventing the flue gas from being blown into the scrubbing tower located below the pipe through the water leakage holes.

[0012] As a further preferred embodiment of this utility model, a number of smoke nozzles are fixedly connected to the outer side of the annular diverter and communicate with the inner cavity of the annular diverter. The bottom of the annular diverter is inserted and connected to two insert rings on the top of the corresponding annular connecting seat, so that when the connecting frame is installed at the connection of the two sections of the washing tower, the annular diverter can be tightly connected to the corresponding annular connecting seat.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this invention, the pretreatment by an electrostatic precipitator and the enhanced purification by cyclone scrubbing tower significantly improve the treatment effect of asphalt fume. At the same time, the scrubbing tower is equipped with a cyclone mechanism, whose flue pipe diversion and annular diversion hood nozzle, together with spiral guide vanes, force the flue gas to spiral upward, prolong the residence time, improve the gas-liquid contact efficiency, and ensure that the flue gas fully contacts the spray liquid, ultimately efficiently removing pollutants such as polycyclic aromatic hydrocarbons and asphalt mist, and ensuring that emissions meet standards. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the swirl mechanism assembly of this utility model;

[0017] Figure 3 This is a schematic diagram of the disassembled structure of the swirl mechanism of this utility model;

[0018] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0019] Figure 5 This is a cross-sectional view of the pipe of this utility model;

[0020] Figure 6 This is a schematic diagram of the assembly of the flow divider and the annular shield of this utility model;

[0021] Figure 7 This is a schematic diagram of the disassembled structure of the flow divider and the annular shield of this utility model;

[0022] Figure 8 This is a cross-sectional view of the flow divider and annular shield of this utility model.

[0023] In the diagram: 1. Electrostatic precipitator; 2. Scrubber; 3. First fan; 4. Second fan; 5. Circulating pump; 6. First smoke pipe; 7. Second smoke pipe; 8. Circulating water tank; 9. First air pipe; 10. Second air pipe; 11. Swirl mechanism; 12. Smoke pipe; 13. Annular connecting seat; 14. Connecting frame; 15. Annular diverter; 16. Annular protective cover; 17. Water inlet; 18. First water leakage channel; 19. Second water leakage channel; 20. Air inlet channel; 21. Insert ring; 22. Fixing ring; 23. Water leakage hole; 24. Spiral guide vane; 25. Smoke nozzle. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] like Figures 1-8 As shown, the present invention provides a composite purification device for asphalt fume, including an electrostatic precipitator 1, a scrubbing tower 2, a first fan 3 and a second fan 4, and a circulating pump 5. A circulating water tank 8 is fixedly connected to the bottom of the scrubbing tower 2. A first smoke pipe 6 is fixedly connected to the input end of the first fan 3 and the output end of the electrostatic precipitator 1. A second smoke pipe 7 is fixedly connected to the output end of the first fan 3 and the scrubbing tower 2. A first air pipe 9 is fixedly connected to the input end of the second fan 4 and the output end of the scrubbing tower 2. A second air pipe 10 is fixedly connected to the output end of the second fan 4. The circulating pump 5, the circulating water tank 8, and the spraying mechanism inside the scrubbing tower 2 are interconnected through connecting pipes. A swirling mechanism 11 is provided inside the scrubbing tower 2. The swirling mechanism 11 includes a smoke hopper 12 and a connecting frame 14. Several annular connecting seats 13 are fixedly connected to the smoke hopper 12. Several annular protective covers 16 are fixedly connected to the connecting frame 14. A fixed ring 22 is fixedly connected inside the annular protective cover 16. An annular diverter hood 15 is fixedly connected to the fixed ring 22.

[0026] like Figure 2 As shown, the bottom of the washing tower 2 extends into the circulating water tank 8 and has several water inlets 17, so that the spray water in the washing tower 2 enters the circulating water tank 8 and is circulated by the circulating pump 5.

[0027] like Figures 3-5As shown, one end of the second flue 7 passes through the scrubbing tower 2 and is fixedly connected to the lower end of the pipe 12, so that the flue gas treated by the electrostatic precipitator 1 is diverted through the pipe 12 into several annular diversion hoods 15. Several first water leakage channels 18 and second water leakage channels 19 are respectively opened in the pipe 12, and the channels 18 and 19 are connected. Several air inlet channels 20 are opened at the top of the pipe 12, and the diameter of the air inlet channels 20 gradually increases from the center point of the top of the pipe 12 outwards. The opening of the first water leakage channels 18 and second water leakage channels 19 allows the spray water in the scrubbing tower 2 to fall into the flue gas. After the smoke enters the pipe 12, it falls into the bottom of the scrubbing tower 2 through the first water leakage channel 18 and the second water leakage channel 19 and enters the circulating water tank 8. The air inlet channel 20 allows the smoke entering the pipe 12 to enter the corresponding annular diverter hood 15. The inner and outer diameters of the top of the annular connecting seat 13 are fixedly connected with insert rings 21, and the inner cavity of the annular connecting seat 13 is connected to the cavity of the pipe 12 through the corresponding air inlet channel 20. This allows the annular diverter hood 15 to be connected to the cavity of the pipe 12 after it is installed in the scrubbing tower 2 through the annular cover 16 and the connecting frame 14.

[0028] like Figures 6-8 As shown, a spiral guide vane 24 is fixedly connected to the inner side of the annular shield 16, which guides the flue gas impacting the inner side of the annular shield 16 and causes it to rise in a spiral state into the scrubbing tower 2, reducing the rising speed of the flue gas and improving the reaction quality between the flue gas and the spray water. Several water leakage holes 23 are opened in the fixed ring 22. The water leakage holes 23 allow the spray water entering between the annular diverter 15 and the annular shield 16 to fall onto the flue 12 and be discharged into the circulating water tank 8 through the first water leakage channel 18 and the second water leakage channel 19. The water leakage holes 23 are inclined. The angle of the nozzle 25 is opposite to that of the opening, which prevents the flue gas from being blown into the scrubbing tower 2 located below the pipe 12 through the water leakage hole 23. Several nozzles 25 are fixedly connected to the outside of the annular diversion hood 15 and communicate with the inner cavity of the annular diversion hood 15. The bottom of the annular diversion hood 15 is inserted into two insert rings 21 on the top of the corresponding annular connecting seat 13, so that when the connecting frame 14 is installed at the connection of the two sections of the scrubbing tower 2, the annular diversion hood 15 can be tightly connected to the corresponding annular connecting seat 13.

[0029] It should be noted that this utility model is a composite purification device for asphalt flue gas. The asphalt flue gas first enters the electrostatic precipitator 1 through an external pipe. The high-voltage electric field is used to ionize and charge pollutants such as polycyclic aromatic hydrocarbons and asphalt mist in the flue gas, which are then adsorbed onto the electrode plate to achieve pretreatment and initially remove some pollutants. After pretreatment, the first fan 3 draws the flue gas in the electrostatic precipitator 1 through the first smoke pipe 6 and transports it to the smoke hopper 12 in the scrubbing tower 2 through the second smoke pipe 7.

[0030] After entering the flue gas 12, it is diverted through several air inlet channels 20 at the top to the corresponding annular connecting seats 13, then enters the annular diversion hood 15, and finally exits from the nozzles 25 on the outside of the annular diversion hood 15. The bottom of the nozzles 25 has a slope to prevent the spray liquid on the fixing ring 22 from entering the nozzles 25. Therefore, the spiral guide vanes 24 on the inner side of the annular shield 16 force the ejected flue gas to spiral upward, prolonging the residence time of the flue gas in the scrubbing tower 2, while reducing the upward speed and increasing the efficiency of the process. To improve the reaction quality between the flue gas and the spray liquid, the circulating pump 5 draws the spray liquid from the circulating water tank 8 and delivers it to the spray mechanism inside the scrubbing tower 2. The spray liquid is sprayed evenly and falls down, and the spiraling flue gas comes into full contact with the falling spray liquid, efficiently absorbing the remaining pollutants in the flue gas. After spraying, the spray liquid flows back to the circulating water tank 8 through the water inlet 17 at the bottom of the scrubbing tower 2 for recycling. Some of the spray liquid falls into the flue 12 and then flows back to the circulating water tank 8 through the first water leakage channel 18 and the second water leakage channel 19.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A composite purification device for asphalt fume, characterized in that: The system includes an electrostatic precipitator (1), a scrubbing tower (2), a first fan (3) and a second fan (4), and a circulating pump (5). A circulating water tank (8) is fixedly connected to the bottom of the scrubbing tower (2). A first smoke pipe (6) is fixedly connected to the input end of the first fan (3) and the output end of the electrostatic precipitator (1). A second smoke pipe (7) is fixedly connected to the output end of the first fan (3) and the scrubbing tower (2). A first air pipe (9) is fixedly connected to the input end of the second fan (4) and the output end of the scrubbing tower (2). A second air pipe is fixedly connected to the output end of the second fan (4). (10) The circulating pump (5) is connected to the circulating water tank (8) and the spraying mechanism in the washing tower (2) through connecting pipes. The washing tower (2) is provided with a swirling mechanism (11). The swirling mechanism (11) includes a pipe (12) and a connecting frame (14). Several annular connecting seats (13) are fixedly connected to the pipe (12). Several annular covers (16) are fixedly connected to the connecting frame (14). A fixed ring (22) is fixedly connected inside the annular cover (16). An annular diverter (15) is fixedly connected to the fixed ring (22).

2. The asphalt fume composite purification device according to claim 1, characterized in that: The bottom of the washing tower (2) extends into the circulating water tank (8) and has several water inlets (17).

3. The asphalt fume composite purification device according to claim 1, characterized in that: One end of the second flue (7) passes through the scrubbing tower (2) and is fixedly connected to the lower end of the pipe (12).

4. The asphalt fume composite purification device according to claim 1, characterized in that: The pipe (12) is provided with a number of first water leakage channels (18) and second water leakage channels (19), and the first water leakage channels (18) and second water leakage channels (19) are connected. The top of the pipe (12) is provided with a number of air intake channels (20), and the diameter of the air intake channels (20) gradually increases from the center point of the top of the pipe (12) outwards.

5. The asphalt fume composite purification device according to claim 1, characterized in that: The inner and outer diameters of the top of the annular connecting seat (13) are fixedly connected with insert rings (21), and the inner cavity of the annular connecting seat (13) is connected to the cavity inside the pipe (12) through the corresponding air intake channel (20).

6. The asphalt fume composite purification device according to claim 5, characterized in that: A spiral guide plate (24) is fixedly connected to the inner side of the annular cover (16), and a number of water leakage holes (23) are opened in the fixed ring (22).

7. The asphalt fume composite purification device according to claim 6, characterized in that: The outer side of the annular diverter (15) is fixedly connected to several smoke nozzles (25) and communicates with the inner cavity of the annular diverter (15). The bottom of the annular diverter (15) is inserted and connected to two insert rings (21) on the top of the corresponding annular connecting seat (13).

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