A multi-stage purification chemical equipment for waste gas of raw material for chemical product production

Abstract

The application relates to a multi-stage purification chemical equipment for waste gas of chemical product production raw materials, which is characterized by that ionization dust removal towers, sulfur removal and denitration towers and dehumidification adsorption towers with inner cavities connected with each other are arranged on a support frame from bottom to top, a central shaft is rotationally arranged in the center of the sulfur removal and denitration tower, the central shaft is connected with an output shaft of a rotating motor installed in the sulfur removal and denitration tower, filter screens are rotationally arranged on the central shaft along the axis at intervals, an annular spraying pipe is arranged above the filter screens, and a water film forming mechanism for collecting spraying liquid, spraying the collected spraying liquid upwards and scraping the spraying liquid on the filter screens to form a water film in the mesh holes of the filter screens is arranged below the filter screens. The water film forming mechanism composed of a lower fan-shaped frame, a liquid pumping pipe, a water pump and a scraper is arranged in the sulfur removal and denitration tower, the mechanism rotates with the central shaft, and the liquid spraying port at the top end of the scraper continuously sprays large-particle-size spraying liquid to the bottom of the filter screens, so that a short and continuous water film is formed at the mesh holes of the filter screens.

Description

Technical Field

[0001] This invention relates to the field of waste gas purification technology, specifically to a multi-stage purification chemical equipment for waste gas from raw materials used in the production of chemical products. Background Technology

[0002] Chemical production processes generate large amounts of complex waste gases, containing particulate matter, sulfur dioxide (SO2), and nitrogen oxides (NOx). x As well as various pollutants such as water vapor. To meet increasingly stringent environmental emission standards, multi-stage purification processes have become the mainstream approach for waste gas treatment. Typically, units such as ionization dust removal, spray desulfurization and denitrification, and adsorption dehumidification are connected in series to achieve graded removal of different pollutants in the waste gas.

[0003] However, existing multi-stage exhaust gas purification equipment still has many shortcomings in practical applications. For example, in the spray desulfurization and denitrification process, the contact between exhaust gas and spray liquid in traditional spray towers is not sufficient, the gas-liquid contact area is limited, resulting in low neutralization reaction efficiency and unsatisfactory removal effects of sulfur dioxide and nitrogen oxides.

[0004] Therefore, there is an urgent need to design a multi-stage purification chemical equipment for the waste gas of chemical product production raw materials with high purification efficiency and sufficient gas-liquid contact. Summary of the Invention

[0005] The technical solution is as follows: A multi-stage purification chemical equipment for waste gas from raw materials used in chemical product production includes a support frame. From bottom to top, an ionization dust removal tower, a desulfurization and denitrification tower, and a dehumidification adsorption tower are sequentially arranged on the support frame, with interconnected internal cavities. A waste gas inlet pipe is connected to the side wall of the ionization dust removal tower, and a purified gas outlet pipe is connected to the top of the dehumidification adsorption tower. A central shaft is rotatably mounted at the center of the desulfurization and denitrification tower, and the central shaft is connected to the output shaft of a rotary motor installed inside the tower. Filter screens are spaced apart and rotate along the central shaft, and an annular spray is positioned above the filter screens. Below the filter screen, there is a water film forming mechanism for collecting spray liquid and spraying the collected spray liquid upwards and scraping it onto the filter screen to form a water film in the mesh of the filter screen. The water film forming mechanism includes a lower fan-shaped frame, a liquid extraction pipe, a water pump, and a scraper. The lower fan-shaped frame is fixedly mounted on the central shaft, and the water pump and scraper are mounted on the lower fan-shaped frame. The liquid inlet end of the water pump is connected to the liquid extraction pipe, which is used to extract the spray liquid. The liquid outlet end of the water pump is connected to the inner cavity of the scraper. The top of the scraper is curved, and the curved surface contacts and fits with the bottom of the filter screen. A spray nozzle is opened at the apex of the curved surface.

[0006] In one embodiment, an isolation component is provided above the filter screen. The isolation component includes an upper fan-shaped frame and an isolation inclined plate. The upper fan-shaped frame is fixedly mounted on the central shaft. Isolation inclined plates are spaced apart inside the upper fan-shaped frame. A liquid collection tank is provided at the bottom upper side of the isolation inclined plate.

[0007] In one embodiment, the area of ​​the upper sector frame is greater than or equal to three times the area of ​​the lower sector frame.

[0008] In one embodiment, a liquid collection frame and an overflow recovery pipe are provided at the connection between the desulfurization and denitrification tower and the ionization dust removal tower. The liquid collection frame is used to collect the spray liquid. The lower end of the liquid extraction pipe extends into the liquid collection frame. The overflow recovery pipe extends out of the outside of the desulfurization and denitrification tower and is used to recover the liquid collected in the liquid collection frame. A hexagonal groove is provided on the liquid collection frame to enable communication between the inner cavity of the desulfurization and denitrification tower and the ionization dust removal tower.

[0009] In one embodiment, the ionization dust removal tower has a polygonal cylinder inside. A central pipe is set at the center of the bottom of the liquid collection frame. The lower end of the central pipe is connected to the exhaust gas input pipe. Vertical plates are arranged at intervals on the circumferential outer wall of the central pipe. The end of the vertical plate away from the central pipe is connected to the inner wall of the polygonal cylinder. A gas supply branch pipe and an ionization dust removal box are arranged between two adjacent vertical plates. The gas supply branch pipe is installed at the lower part of the ionization dust removal box. The ionization dust removal box is vertically connected. Ionization adsorption plates are arranged at intervals inside the ionization dust removal box. Multiple partitions are vertically arranged between adjacent ionization adsorption plates. A discharge plate is arranged between the ionization dust removal box and the gas supply branch pipe.

[0010] In one embodiment, a rotating shaft is rotatably provided at both the upper and lower parts of the partition, and a baffle plate is provided on the rotating shaft. A double-headed cylinder is provided on the outer wall of the ionization dust removal box facing the polygonal cylinder. A lifting frame is connected to the piston rod of each double-headed cylinder. An L-shaped knob is fixedly connected to the end of the rotating shaft that passes through the ionization dust removal box. The L-shaped knob is slidably engaged with the lifting frame.

[0011] In one embodiment, a slide is provided on both sides of the vertical plate near the polygonal cylinder, and a slider is slidably provided on the slide. The slider is installed on the ionization dust removal box. An eccentric motor is provided at intervals along its axial direction inside the ionization dust removal box. An eccentric block is connected to the output shaft of the eccentric motor. When the eccentric motor drives the eccentric block to rotate, the ionization dust removal box moves up and down along the slide via the slider.

[0012] In one embodiment, multiple purification and adsorption sponges are arranged at intervals along the axis of the dehumidification adsorption tower.

[0013] The beneficial effects are: 1. By installing a water film forming mechanism consisting of a lower fan-shaped frame, a liquid extraction pipe, a water pump, and a scraper inside the desulfurization and denitrification tower, this mechanism rotates with the central axis and continuously sprays large-particle-size spray liquid onto the bottom of the filter screen through the spray nozzle at the top of the scraper, thus forming a short-term but continuous water film at the mesh openings of the filter screen. When the exhaust gas passes through the filter screen from bottom to top, it must break through the water film, thereby increasing the contact area between the exhaust gas and the spray liquid, making the neutralization reaction more complete, and improving the removal efficiency of sulfur dioxide and nitrogen oxides.

[0014] 2. A switching mechanism consisting of a rotating shaft, baffle plate, double-headed cylinder, lifting frame, and L-shaped knob is installed inside the ionization dust removal chamber. When enhanced purification is required, the piston rod of the double-headed cylinder retracts, the baffle plate closes, and the original vertical direct flow channel is switched to an N-shaped detour channel, effectively extending the residence time of gas in the ionization dust removal tower and improving electrostatic adsorption efficiency. When rapid processing or energy reduction is required, the baffle plate opens, and the gas rises directly along the vertical channel, meeting the needs of different production rhythms.

[0015] 3. By setting an isolation component consisting of an upper fan-shaped frame and an isolation inclined plate above the filter screen, the mixed water droplets formed after the spray liquid sprayed from the annular spray pipe reacts with the acidic gas are guided by the isolation inclined plate to the collection tank during the downward dripping process, and discharged along the inner wall of the upper fan-shaped frame, thus preventing the mixed water droplets from directly breaking through the water film already formed on the filter screen. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional sectional view of the present invention.

[0018] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the desulfurization and denitrification tower of the present invention.

[0019] Figure 4 For the present invention Figure 3 A partial three-dimensional structural diagram.

[0020] Figure 5 This is a partial three-dimensional sectional view of the filter screen of the present invention.

[0021] Figure 6 This is a three-dimensional structural diagram of the lower sector frame, liquid extraction pipe, water pump, and scraper of the present invention.

[0022] Figure 7 This is a three-dimensional structural diagram of the isolation component of the present invention.

[0023] Figure 8 This is a three-dimensional structural diagram of the ionization dust removal tower of the present invention.

[0024] Figure 9 This is a three-dimensional sectional view of the liquid collection frame of the present invention.

[0025] Figure 10 This is a partial three-dimensional structural diagram of the central pipe, vertical plate, gas supply branch pipe, and ionization dust removal box of the present invention.

[0026] Figure 11 This is a first-view perspective sectional view of the ionization dust removal box of the present invention.

[0027] Figure 12This is a two-dimensional sectional view of the ionization dust removal box of the present invention from a second perspective.

[0028] Figure 13 This is a three-dimensional structural diagram of the flow path of exhaust gas when the baffle plate of the present invention is closed.

[0029] In the attached diagram, the following are the reference numerals: 1. Support frame; 2. Ionization dust removal tower; 201. Waste gas inlet pipe; 202. Waste residue outlet pipe; 3. Desulfurization and denitrification tower; 4. Dehumidification adsorption tower; 401. Purified gas outlet pipe; 5. Purified adsorption sponge; 6. Annular spray pipe; 61. Spray liquid inlet pipe; 7. Central shaft; 8. Rotary motor; 9. Filter screen; 10. Isolation component; 1001. Upper fan-shaped frame; 1002. Isolation inclined plate; 1003. Liquid collection tank; 11. Lower fan-shaped frame; 12. Liquid pump. 13. Pipe, 14. Water pump, 15. Scraper, 16. Spray nozzle, 17. Liquid collection frame, 18. T-shaped channel, 19. Overflow recovery pipe, 20. Polygonal cylinder, 21. Central pipe, 22. Vertical plate, 23. Gas supply branch pipe, 24. Slide, 25. Slider, 26. Eccentric motor, 27. Ionization dust removal box, 28. Ionization adsorption plate, 29. Partition plate, 20. Baffle plate, 21. Rotating shaft, 22. L-shaped knob, 23. Lifting frame, 34. Double-headed cylinder, 35. Discharge plate. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0031] Example: A multi-stage purification chemical equipment for waste gas from raw materials used in chemical product manufacturing, such as... Figure 1 and Figure 2 As shown, the system includes a support frame 1, an ionization dust removal tower 2, a desulfurization and denitrification tower 3, and a dehumidification adsorption tower 4. The support frame 1 is provided with the ionization dust removal tower 2, the desulfurization and denitrification tower 3, and the dehumidification adsorption tower 4, which are interconnected internally, arranged sequentially from bottom to top. The bottom of the ionization dust removal tower 2 is connected to a waste residue discharge pipe 202, and the side wall of the ionization dust removal tower 2 is connected to a waste gas input pipe 201. The top of the dehumidification adsorption tower 4 is connected to a purified gas discharge pipe 401. After the waste gas is input from the waste gas input pipe 201, it passes through the ionization dust removal tower 2, the desulfurization and denitrification tower 3, and the dehumidification adsorption tower 4 sequentially from bottom to top, and is discharged from the purified gas discharge pipe 401.

[0032] like Figures 3-6As shown, a central shaft 7 is rotatably mounted at the center of the desulfurization and denitrification tower 3. The central shaft 7 is connected to the output shaft of a rotary motor 8 installed inside the desulfurization and denitrification tower 3. Filter screens 9 are rotatably mounted at intervals along the central shaft 7. An annular spray pipe 6 is mounted above the filter screens 9. Spray nozzles are spaced at intervals along the circumference of the annular spray pipe 6. The annular spray pipe 6 is connected to a spray liquid inlet pipe 61 mounted on the outer wall of the desulfurization and denitrification tower 3. The spray liquid used for desulfurization and denitrification is input into the annular spray pipe 6 through the spray liquid inlet pipe 61 and sprayed out through the spray nozzles. The sprayed liquid combines with sulfur dioxide and nitrogen oxides in the gas inside the desulfurization and denitrification tower 3 to remove sulfur dioxide and nitrogen oxides from the gas, thus achieving the effect of desulfurization and denitrification of the gas inside the desulfurization and denitrification tower 3. Below the filter screen 9, there is a water film forming mechanism for collecting the sprayed liquid and spraying the collected sprayed liquid upwards and scraping it onto the filter screen 9 to form a water film in the mesh of the filter screen 9. The water film forming mechanism includes a lower fan-shaped frame 11, a liquid extraction pipe 12, a water pump 13, and a scraper 14. The lower fan-shaped frame is fixedly mounted on the central shaft 7. A water pump 13 and a scraper 14 are installed on the lower sector. The inlet end of the water pump 13 is connected to a suction pipe 12, which is used to draw spray liquid. The outlet end of the water pump 13 is connected to the inner cavity of the scraper 14. The top of the scraper 14 is curved, which contacts and fits with the bottom of the filter screen 9. A spray nozzle 141 is opened at the apex of the curved surface. When the central shaft 7 rotates, the lower sector frame 11 and the scraper 14 rotate with the central shaft 7. The water pump 13 pumps the drawn spray liquid to the inner cavity of the scraper 14 through the suction pipe 12, and finally sprays the liquid through the scraper 14. The spray nozzle 141 sprays onto the filter screen 9. As the scraper 14 rotates around the central axis 7, it moves circumferentially around the bottom of the filter screen 9, spraying the spray liquid onto the filter screen 9 during this circumferential movement. The spray liquid sprayed from the nozzle 141 reaches the mesh of the filter screen 9 directly and has a diameter larger than the spray liquid sprayed from the nozzle of the annular spray pipe 6. Therefore, the spray liquid sprayed from the nozzle 141 forms a short-term water film at the mesh of the filter screen 9, which increases the contact area between the gas and the spray liquid when the gas passes through the filter screen 9 from bottom to top, thereby enhancing the desulfurization and denitrification effect.

[0033] like Figure 5 and Figure 7As shown, an isolation component 10 is provided above the filter screen 9. The isolation component 10 includes an upper fan-shaped frame 1001 and an isolation inclined plate 1002. The upper fan-shaped frame 1001 is fixedly mounted on the central shaft 7. Isolation inclined plates 1002 are provided at intervals inside the upper fan-shaped frame 1001. A liquid collection tank 1003 is provided at the bottom of the upper side of the isolation inclined plate 1002. The spray liquid sprayed from the spray nozzle of the annular spray pipe 6 reacts with sulfur dioxide and nitrogen oxides in the gas to form falling mixed water droplets. When these mixed water droplets fall downwards and land on the isolation inclined plate 1002, the inclined surface of the isolation inclined plate 1002 guides them into the liquid collection tank 1003. The liquid collection tank 1003 guides the mixed water droplets to the inner wall of the upper fan-shaped frame 1001, so that they fall downwards along the inner wall of the upper fan-shaped frame 1001. This prevents the mixed water droplets from falling onto the filter screen 9 covered by the upper fan-shaped frame 1001, thereby ensuring the integrity of the water film on the filter screen 9 covered by the upper fan-shaped frame 1001.

[0034] It is worth noting that the area of ​​the upper fan-shaped frame 1001 is greater than or equal to three times the area of ​​the lower fan-shaped frame 11. This arrangement ensures that the water film is not broken by mixed water droplets before it breaks on its own.

[0035] like Figure 8 and Figure 9 As shown, a liquid collection frame 15 and an overflow recovery pipe 16 are provided at the connection between the desulfurization and denitrification tower 3 and the ionization dust removal tower 2. In this embodiment, the liquid collection frame 15 is installed on the ionization dust removal tower 2. The liquid collection frame 15 is used to collect the spray liquid. The lower end of the liquid extraction pipe 12 extends into the liquid collection frame 15. The overflow recovery pipe 16 extends out of the outside of the desulfurization and denitrification tower 3. The overflow recovery pipe 16 is used to recover the liquid collected in the liquid collection frame 15. A hexagonal through groove 151 is provided on the liquid collection frame 15. The hexagonal through groove 151 is used to connect the inner cavity of the desulfurization and denitrification tower 3 and the ionization dust removal tower 2. The gas after electrostatic dust removal in the ionization dust removal tower 2 enters the desulfurization and denitrification tower 3 through the hexagonal through groove 151. To prevent the liquid collected in the collection frame 15 from flowing into the ionization dust removal tower 2 through the helical channel 151, the inlet of the overflow recovery pipe 16 should be lower than the outlet of the helical channel 151 located above the collection frame 15. Additionally, a one-way valve can be installed in the helical channel 151 to allow gas in the ionization dust removal tower 2 to enter the desulfurization and denitrification tower 3 in one direction. The mixed liquid droplets after the reaction fall into the collection frame 15 for collection. Part of the liquid is discharged outside the tower through the overflow recovery pipe 16 for recycling, while the rest is pumped by the extraction pipe 12 to the scraper 14 and then sprayed onto the filter screen 9 through the spray nozzle 141 of the scraper 14, thus achieving the recycling of the spray liquid.

[0036] like Figure 10As shown, the ionization dust removal tower 2 contains a polygonal cylinder 17. A central pipe 18 is located at the bottom center of the liquid collection frame 15. The lower end of the central pipe 18 is connected to the exhaust gas inlet pipe 201. Vertical plates 19 are spaced apart on the circumferential outer wall of the central pipe 18. The end of the vertical plate 19 away from the central pipe 18 is connected to the inner wall of the polygonal cylinder 17. A gas supply branch pipe 20 and an ionization dust removal box 24 are arranged between two adjacent vertical plates 19. The gas supply branch pipe 20 is installed at the lower part of the ionization dust removal box 24 and is connected to the central pipe 18. The ionization dust collector 24 is provided with air outlets at intervals, facing upwards. The ionization dust collector 24 is vertically connected. Ionization adsorption plates 25 are provided at intervals inside the ionization dust collector 24. The ionization adsorption plates 25 divide the inner cavity of the ionization dust collector 24 into multiple chambers. Multiple partitions 26 are vertically arranged between adjacent ionization adsorption plates 25. The partitions 26 further divide the chamber between two adjacent ionization adsorption plates 25 into multiple vertical channels for gas to flow from bottom to top. A discharge plate 32 is provided between the ionization dust collector 24 and the gas supply branch pipe 20.

[0037] like Figure 2 As shown, multiple purification and adsorption sponges 5 are arranged at intervals along the axis inside the dehumidification adsorption tower 4.

[0038] During operation, the exhaust gas first enters the ionization dust removal tower 2 through the exhaust gas inlet pipe 201 to remove dust and fine particles; then it rises to the desulfurization and denitrification tower 3, where sulfur dioxide and nitrogen oxides are removed through a spray neutralization reaction; finally, it enters the dehumidification adsorption tower 4, where it is adsorbed and dried before being discharged through the purified gas outlet pipe 401 to meet emission standards. The specific working process is as follows: Exhaust gas enters the central pipe 18 through the exhaust gas inlet pipe 201, and then is distributed to each gas delivery branch pipe 20. The gas is discharged into the corresponding ionization dust collector 24 through the upward-facing outlets on the branch pipes. As the gas rises through the discharge plate 32, the high-voltage electric field charges the dust and aerosol particles, and the charged particles enter the ionization dust collector 24 with the airflow. Inside the collector, the ionization adsorption plate 25 captures the charged particles through electrostatic attraction, achieving efficient removal of dust and fine particles.

[0039] After ionization and dust removal, the gas rises through the I-shaped channel 151 on the liquid collection frame 15 and enters the desulfurization and denitrification tower 3. An annular spray pipe 6 is installed at the top of the tower, and alkaline spray liquid is introduced through the spray liquid inlet pipe 61. The spray liquid is evenly sprayed downwards by annularly arranged spray nozzles, reacting with SO2 and NO in the rising exhaust gas. x When in full contact, a neutralization reaction occurs, producing a mixture of sulfate, nitrate, and other droplets.

[0040] Simultaneously, the rotary motor 8 drives the central shaft 7 to rotate, and the lower sector frame 11, scraper 14, and water pump 13 fixed on it rotate with the shaft. The water pump 13 draws circulating spray liquid from the collection frame 15 through the liquid extraction pipe 12, pressurizes it, and sends it to the spray nozzle 141 at the top of the scraper 14. The spray nozzle 141 sprays circumferentially along the bottom surface of the filter screen 9, and its droplet diameter is relatively large, which can form a short-term and continuous liquid film at the mesh of the filter screen 9. When the gas passes through the filter screen 9 from bottom to top, it must break through the water film, thereby greatly increasing the gas-liquid contact area and turbulence, and significantly accelerating the desulfurization and denitrification reaction rate. The upper sector frame 1001 rotates synchronously with the central shaft 7, and the isolation inclined plate 1002 on it guides the mixed droplets dripping from above to the collection tank 1003 and drains them along the inner wall of the upper sector frame 1001, effectively preventing the droplets from directly breaking through the water film on the filter screen 9, and ensuring that the water film remains intact before natural rupture. The area of ​​the upper fan-shaped frame 1001 is designed to be more than three times that of the lower fan-shaped frame 11, further protecting the water film from impact damage.

[0041] The desulfurized and denitrified gas continues to rise into the dehumidification adsorption tower 4. Multiple layers of purification adsorption sponges 5 are spaced along the tower's axis; their porous structure efficiently adsorbs residual moisture, acidic droplets, and trace amounts of harmful substances from the gas, further drying and purifying it. Finally, the clean purified gas is discharged from the purified gas exhaust pipe 401 at the top of the tower, completing the entire purification process.

[0042] like Figure 12 and Figure 13As shown, a switching mechanism for changing the shape of the vertical channel is also provided. The switching mechanism includes a rotating shaft 271, a baffle plate 27, a double-headed cylinder 30, a lifting frame 29, and an L-shaped knob 28. The rotating shaft 271 is rotatably installed on both the upper and lower parts of the partition plate 26. The baffle plate 27 is installed on the rotating shaft 271. When the baffle plate 27 is closed, the partition plate 26, the baffle plate 27, and the ionization adsorption plate 25 deform the vertical channel into an N-shaped channel to extend the gas flow path. The ionization dust removal box 24 is provided with a double-headed cylinder 30 on the outer wall of the polygonal cylinder 17. The piston rod of the double-headed cylinder 30 is connected to the lifting frame 29. The rotating shaft 271 rotates through the end of the ionization dust removal box 24 and is fixedly connected to the L-shaped knob 28. The L-shaped knob 28 slides with the lifting frame 29. When the piston rod of the double-headed cylinder 30 extends outward, the lifting frame 29 drives the L-shaped knob 28 to rotate away from the double-headed cylinder 30 around the hinge axis of the baffle plate 27, causing the baffle plate 27 to rotate outward around the pivot 271. At this time, all vertical channels are open vertically. When the piston rod of the double-headed cylinder 30 retracts inward, the lifting frame 29 drives the L-shaped knob 28 to rotate towards the double-headed cylinder 30 around the hinge axis of the baffle plate 27, causing the baffle plate 27 to close inward around the pivot 271. At this time, the vertical channels are blocked by the baffle plate 27, and only the vertical channels on both ends are open one up and one down, realizing the function of switching from vertical channels to N-shaped channels, thereby extending the residence time of gas in the ionization dust removal tower 2.

[0043] To adapt to different operating conditions, this equipment is equipped with a channel switching mechanism. When enhanced purification is required, the piston rod of the double-headed cylinder 30 retracts, driving the lifting frame 29 to rotate the L-shaped knob 28, closing the baffle plate 27 and switching the original vertical channel to an N-shaped detour channel. This extends the residence time of the gas in the ionization dust collector 24, improving adsorption efficiency. When rapid passage is required, the piston rod of the double-headed cylinder 30 extends, the baffle plate 27 opens, and the gas flows straight upward along the vertical channel, meeting the needs of different production rhythms. like Figure 10 and Figure 11 As shown, a slide 21 is provided on both sides of the vertical plate 19 near the polygonal cylinder 17. A slider 22 is slidably mounted on the slide 21. The slider 22 is mounted on the ionization dust removal box 24. An eccentric motor 23 is provided at intervals along its axial direction inside the ionization dust removal box 24. An eccentric block is connected to the output shaft of the eccentric motor 23. When the eccentric motor 23 drives the eccentric block to rotate, the ionization dust removal box 24 moves up and down along the slide 21 through the slider 22.

[0044] To achieve self-cleaning of the ionization adsorption plate 25, the eccentric block is driven by the eccentric motor 23 to vibrate, so that the ionization dust removal box 24 vibrates up and down by the slider 22 moving up and down along the slide 21. This causes the particles deposited on the surface of the ionization adsorption plate 25 to fall off. The fallen particles fall downward and are discharged to the outside of the ionization dust removal tower 2 through the waste discharge pipe 202.

[0045] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes made to the content described in the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A multi-stage purification chemical equipment for waste gas from raw materials used in the production of chemical products, comprising a support frame (1), on which an ionization dust removal tower (2), a desulfurization and denitrification tower (3), and a dehumidification adsorption tower (4) are arranged sequentially from bottom to top, with interconnected internal cavities. A waste gas input pipe (201) is connected to the side wall of the ionization dust removal tower (2), and a purified gas discharge pipe (401) is connected to the top of the dehumidification adsorption tower (4). A central shaft (7) is rotatably arranged at the center of the desulfurization and denitrification tower (3), and the central shaft (7) is connected to the output shaft of a rotary motor (8) installed inside the desulfurization and denitrification tower (3). A filter screen (9) is rotatably arranged along the central shaft (7) at intervals, and an annular spray pipe (6) is arranged above the filter screen (9). Its characteristics are, Below the filter screen (9) is a water film forming mechanism for collecting spray liquid and spraying the collected spray liquid upward and scraping it onto the filter screen (9) to form a water film in the mesh of the filter screen (9). The water film forming mechanism includes a lower fan-shaped frame (11), a liquid extraction pipe (12), a water pump (13) and a scraper (14). The lower fan-shaped frame is fixedly set on the central shaft (7). The water pump (13) and the scraper (14) are installed on the lower fan-shaped frame. The liquid inlet end of the water pump (13) is connected to the liquid extraction pipe (12). The liquid extraction pipe (12) is used to extract the spray liquid. The liquid outlet end of the water pump (13) is connected to the inner cavity of the scraper (14). The top of the scraper (14) is curved. The curved surface contacts and fits with the bottom of the filter screen (9). A spray nozzle (141) is opened at the top of the curved surface.

2. The multi-stage purification chemical equipment for waste gas from raw materials used in chemical product production as described in claim 1, characterized in that, An isolation component (10) is provided above the filter screen (9). The isolation component (10) includes an upper fan-shaped frame (1001) and an isolation inclined plate (1002). The upper fan-shaped frame (1001) is fixedly mounted on the central shaft (7). Isolation inclined plates (1002) are provided at intervals inside the upper fan-shaped frame (1001). A liquid collection tank (1003) is provided at the bottom of the upper side of the isolation inclined plate (1002).

3. The multi-stage purification chemical equipment for waste gas from raw materials used in chemical product production as described in claim 2, characterized in that, The area of ​​the upper sector (1001) is greater than or equal to three times the area of ​​the lower sector (11).

4. The multi-stage purification chemical equipment for waste gas from raw materials used in chemical product production as described in claim 1, characterized in that, A liquid collection frame (15) and an overflow recovery pipe (16) are provided at the connection between the desulfurization and denitrification tower (3) and the ionization dust removal tower (2). The liquid collection frame (15) is used to collect the spray liquid. The lower end of the liquid extraction pipe (12) extends into the liquid collection frame (15). The overflow recovery pipe (16) extends out of the outside of the desulfurization and denitrification tower (3). The overflow recovery pipe (16) is used to recover the liquid collected in the liquid collection frame (15). A rib-shaped through groove (151) is provided on the liquid collection frame (15). The rib-shaped through groove (151) is used to connect the inner cavity of the desulfurization and denitrification tower (3) and the ionization dust removal tower (2).

5. The multi-stage purification chemical equipment for waste gas from raw materials used in chemical product production as described in claim 4, characterized in that, The ionization dust removal tower (2) has a polygonal cylinder (17) inside. A central pipe (18) is set at the bottom center of the liquid collection frame (15). The lower end of the central pipe (18) is connected to the exhaust gas input pipe (201). Vertical plates (19) are set at intervals on the circumferential outer wall of the central pipe (18). The end of the vertical plate (19) away from the central pipe (18) is connected to the inner wall of the polygonal cylinder (17). A gas supply branch pipe (20) and an ionization dust removal box (24) are set between two adjacent vertical plates (19). The gas supply branch pipe (20) is installed at the lower part of the ionization dust removal box (24). The ionization dust removal box (24) is vertically connected. Ionization adsorption plates (25) are set at intervals inside the ionization dust removal box (24). Multiple partitions (26) are set vertically between adjacent ionization adsorption plates (25). A discharge plate (32) is set between the ionization dust removal box (24) and the gas supply branch pipe (20).

6. The multi-stage purification chemical equipment for waste gas from raw materials used in chemical product production as described in claim 5, characterized in that, A rotating shaft (271) is rotatably installed on both the upper and lower parts of the partition (26), and a baffle plate (27) is installed on the rotating shaft (271); a double-headed cylinder (30) is installed on the outer wall of the ionization dust removal box (24) facing the polygonal cylinder (17), and a lifting frame (29) is connected to the piston rod of the double-headed cylinder (30). An L-shaped knob (28) is fixedly connected to the end of the rotating shaft (271) that rotates through the ionization dust removal box (24), and the L-shaped knob (28) slides with the lifting frame (29).

7. The multi-stage purification chemical equipment for waste gas from raw materials used in chemical product production as described in claim 5, characterized in that, A slide (21) is provided on both sides of the vertical plate (19) near the polygonal cylinder (17). A slider (22) is slidably provided on the slide (21). The slider (22) is installed on the ionization dust removal box (24). An eccentric motor (23) is provided at intervals along its axial direction inside the ionization dust removal box (24). An eccentric block is connected to the output shaft of the eccentric motor (23). When the eccentric motor (23) drives the eccentric block to rotate, the ionization dust removal box (24) moves up and down along the slide (21) through the slider (22).

8. The multi-stage purification chemical equipment for waste gas from raw materials used in chemical product production as described in claim 1, characterized in that, Multiple purification and adsorption sponges (5) are arranged at intervals along the axis of the dehumidification adsorption tower (4).

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