Composite wet dust removal equipment and multi-stage purification process

Abstract

The invention relates to composite wet dust removal equipment and a multi-stage purification process applied to the composite wet dust removal equipment, and the process comprises the following steps: step 1, during polishing, part of dust-containing waste gas of a wet polishing table enters a water washing tank, is wetted by a first spraying device and then is filtered by water washing paper; meanwhile, the side suction type dust suction port and the bottom suction type dust suction port suck the other part of waste gas into the conical wet dust removal pipe; 2, a second spraying device is used for spraying and dedusting the waste gas in the conical wet-type dedusting pipe; 3, the purified waste gas and waste liquid enter a gas-water separator and are separated through a cyclone demisting plate, waste water is discharged into a water circulation system, and the waste gas enters a Venturi wet purification pipe; 4, a third spraying device sprays the waste gas, liquid is broken into small liquid drops through a shrinkage pipe, the small liquid drops make full contact with the waste gas, and pollutants are further removed; 5, the waste gas enters a wet type spray tower, is sprayed by a fourth spray device and demisted by a filler demisting layer, and is discharged through a flue; the multi-stage purification process has the characteristic of high purification efficiency.

Description

Technical Field

[0001] This invention relates to the field of grinding and dust removal equipment technology, specifically to a composite wet dust removal equipment and a multi-stage purification process. Background Technology

[0002] Metal dust particles generated during the polishing of aluminum products pose a significant explosion risk and can easily accumulate in equipment or workshops, creating potential explosion hazards. While existing dry dust removal technologies are widely used, they have significant drawbacks, such as dust buildup on filter bag surfaces forming a hard shell, leading to incomplete cleaning. Although existing wet dust removal technologies can enhance purification effects and reduce explosion risks, they often employ a single spray structure, resulting in limited purification efficiency and a lack of explosion-proof design, as well as high water consumption. Therefore, there is an urgent need for a composite wet dust removal device and a multi-stage purification process to address these issues. Summary of the Invention

[0003] In view of this, a composite wet dust removal equipment and multi-stage purification process with high purification efficiency and reduced water waste are provided.

[0004] A composite wet dust removal device includes a wet grinding table, a conical wet dust collection pipe, a gas-water separator, a Venturi wet purification pipe, a wet spray tower, and a water circulation system. The wet grinding table is equipped with a first spray device, the conical wet dust collection pipe is equipped with a second spray device, the Venturi wet purification pipe is equipped with a third spray device, and the wet spray tower is equipped with a fourth spray device. The wet grinding table is connected to the gas-water separator through the conical wet dust collection pipe. The gas-water separator is connected to the Venturi wet purification pipe through a first exhaust pipe. The Venturi wet purification pipe is connected to the wet spray tower. The wet spray tower is connected to a flue through a second exhaust pipe so that the purified waste gas is discharged outside the tower through a chimney. The water circulation system is connected to the first, second, third, and fourth spray devices respectively, and collects the wastewater after use from each spray device. After sedimentation, the upper layer of clear water is taken and recycled to each spray device for reuse.

[0005] Furthermore, a water washing tank is provided below the surface of the wet polishing table. The first spray device is installed in the water washing tank and is used to wet the dust and impurities entering the water washing tank. The water washing tank also contains washing paper, which is used for preliminary filtration of the wetted dust and impurities. The water circulation system includes a secondary circulating water tank, which is connected to the first spray device and the water washing tank. The secondary circulating water tank supplies water to the first spray device through a water supply pipe. A drain outlet is provided at the bottom of the water washing tank, and the dust-laden wastewater returns to the secondary circulating water tank from the drain outlet through a return water pipe.

[0006] Furthermore, the wet sanding table is equipped with a side-suction dust inlet, a bottom-suction dust inlet, and an exhaust port. The side-suction dust inlet and the bottom-suction dust inlet are both connected to the exhaust port to remove the exhaust gas generated during sanding. The exhaust port is connected to the conical wet dust removal pipe through a branch pipe. The wet sanding table is equipped with a partition to separate the sanding space and the dust removal buffer space. The side-suction dust inlet and the bottom-suction dust inlet are configured to connect the sanding space and the dust removal buffer space. The exhaust port is connected to the dust removal buffer space to draw dust and impurities generated during sanding into the conical wet dust removal pipe through the branch pipe.

[0007] Furthermore, the large-diameter end of the conical wet dust collector pipe is connected to the gas-water separator. A water tank is provided on the conical inclined surface at the bottom of the conical wet dust collector pipe, and a second spray device is provided on the pipe wall of the top conical inclined surface opposite to the water tank. The second spray device includes multiple detachable spray water tanks, each of which is provided with multiple nozzles. A spark detection device, a dust concentration detection device, and a carbon dioxide fire extinguishing device are also provided on the pipe wall at the end of the conical wet dust collector pipe near the gas-water separator. The multiple spray water tanks are designed to be spaced apart along the axial or length direction of the conical wet dust collector pipe. There are multiple wet grinding tables, each of which is connected to the conical wet dust collector pipe through at least one branch pipe. The multiple branch pipes and the multiple spray water tanks are arranged alternately on the conical wet dust collector pipe, and each branch pipe is located at the front end of the airflow direction relative to a corresponding spray water tank.

[0008] Furthermore, the water circulation system includes a main circulating water tank, which is connected to the second spray device. The main circulating water tank has a built-in three-stage filter, a hydrogen alarm device, a temperature alarm device, a water level alarm device, and a flow monitoring alarm device. The composite wet dust removal equipment also includes a control system, which is connected to the hydrogen alarm device, the temperature alarm device, the water level alarm device, and the flow monitoring alarm device, respectively. The circulation pipe of the main circulating water tank is equipped with a heat insulation structure to prevent the circulating water from freezing and causing poor flow.

[0009] Furthermore, the gas-water separator has an air outlet at the top, which is connected to the first exhaust pipe. The gas-water separator also has a drain outlet at the bottom, which is connected to the water circulation system. The gas-water separator has an air inlet and an inlet in the middle, with the inlet connected to the conical wet dust collector pipe. A first fan is installed at the air inlet, and a cyclone demister is connected to the inner wall above the air inlet. The cyclone demister is used to separate the waste gas and wastewater entering from the inlet under the action of strong centrifugal force. The wastewater is thrown towards the inner wall of the gas-water separator and flows along the inner wall to the drain outlet. The waste gas is discharged from the air outlet.

[0010] Furthermore, an explosion-proof valve and an explosion relief port are provided in the first exhaust pipe between the gas-water separator and the Venturi wet purification pipe, and an explosion relief disc is installed at the explosion relief port.

[0011] Furthermore, the Venturi wet scrubbing tube includes an inlet and a shrink tube connected to the inlet. The nozzle of the third spray device is located at the inlet. The shrink tube is used to significantly increase the flow rate of the liquid sprayed from the nozzle of the third spray device, thereby causing the high-speed flowing liquid and gas to generate a strong shearing effect and break the liquid into a large number of fine droplets. The third spray device is connected to the water circulation system.

[0012] Furthermore, the top of the wet spray tower is provided with an exhaust port and a packing demister layer. The exhaust port is connected to the second exhaust pipe. A second fan is installed at the exhaust port. The fourth spray device is located below the packing demister layer. The fourth spray device includes multiple layers of nozzles arranged in a grid pattern. The bottom of the wet spray tower is provided with a water outlet. The fourth spray device and the water outlet are connected to the water circulation system.

[0013] A multi-stage purification process, implemented by the aforementioned composite wet dust collection equipment, includes the following steps: Step 1: During the grinding operation, some of the dust-laden exhaust gas generated by the wet grinding table enters the water washing tank. After being wetted by the first spray device, it undergoes preliminary filtration through the water washing paper in the water washing tank, and then enters the secondary circulating water tank for sedimentation through the drain outlet. At the same time, another part of the dust-laden exhaust gas generated by the wet grinding table enters the conical wet dust collection pipe through the side suction port, the bottom suction port, and the branch pipe. Step 2: Inside the conical wet dust collector pipe, the dust-laden exhaust gas is sprayed by the second spray device to mix the dust and water in the exhaust gas and allow it to settle. To prevent dust from settling and accumulating inside the pipe, the flow velocity inside the pipe is ≥23m / s and the pipe length is ≤3m. Step 3: The waste gas and waste liquid purified by the conical wet dust collector enter the gas-liquid separator. Under the action of the cyclone demister, gas-liquid separation is achieved. The separated waste water is discharged into the water circulation system through the drain outlet, and the separated waste gas enters the Venturi wet purification tube through the first exhaust pipe. Step 4: Inside the Venturi wet scrubbing tube, the exhaust gas is sprayed through the third spray device. The shrink tube structure breaks the liquid into fine droplets, which come into full contact with the exhaust gas to further remove pollutants from the exhaust gas. Step 5: The exhaust gas purified by the Venturi wet scrubbing pipe enters the wet scrubbing tower, is sprayed by the fourth scrubbing device to obtain purified mist, and is then demisted by the packing demister layer before being discharged into the flue through the second exhaust pipe and finally discharged through the chimney.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: This composite wet dust removal equipment employs a multi-stage spray structure consisting of a first spray device on a wet grinding table, a second spray device in a conical wet dust collection pipe, a third spray device in a Venturi wet purification pipe, and a fourth spray device in a wet spray tower. This multi-stage spray structure is combined with a gas-liquid separator. The dust-laden gas exiting the gas-liquid separator enters the Venturi wet purification pipe at high speed. Inside the Venturi wet purification pipe, the high-speed rotating dust-laden gas mixes with the high-speed flowing liquid, significantly enhancing the gas-liquid mixing effect. This system efficiently captures dust particles from dust-laden exhaust gas. In a multi-stage purification process, the exhaust gas undergoes initial filtration with water-washed paper in a washing tank, followed by spray settling in a conical wet dust collector, gas-liquid separation in a gas-liquid separator, enhanced shearing in a Venturi wet purification tube, and final deep purification in a wet spray tower before being discharged. The purification efficiency is high. Furthermore, the wet grinding table, conical wet dust collector, gas-liquid separator, Venturi wet purification tube, and wet spray tower are all connected to the aforementioned water circulation system. Wastewater is reused after sedimentation, effectively reducing water waste. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a multi-stage purification process implemented using a composite wet dust removal device according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of a composite wet dust removal device according to an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the connection between the conical wet dust collection pipe and the main circulating water tank of a composite wet dust collection device according to an embodiment of the present invention.

[0018] Figure 4 This is a three-dimensional structural diagram of a wet grinding table of a composite wet dust removal device according to an embodiment of the present invention.

[0019] Figure 5 This is a side view of the wet grinding table of a composite wet dust removal device according to an embodiment of the present invention.

[0020] Figure 6 This is a cross-sectional structural diagram of the gas-water separator of a composite wet dust removal device according to an embodiment of the present invention.

[0021] Figure 7 This is a cross-sectional structural diagram of the Venturi wet purification pipe and wet spray tower of a composite wet dust removal device according to an embodiment of the present invention.

[0022] In the picture, 1. Wet grinding table; 2. Conical wet dust collection pipe; 3. Air-water separator; 4. Venturi wet purification pipe; 5. Wet spray tower; 6. Second spray device; 7. First exhaust pipe; 8. Second exhaust pipe; 9. Spark detection device; 10. Dust concentration detection device; 11. Carbon dioxide fire extinguishing device; 12. Branch pipe; 13. Main circulating water tank; 14. Air outlet; 15. Air inlet; 16. Cyclone demister plate; 17. Explosion-proof valve; 18. Water inlet; 19. Packing demister layer; 20. Exhaust port; 21. Second fan; 22. Drain outlet; 23. Exhaust interface. Detailed Implementation

[0023] 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.

[0024] Please see Figures 1 to 7 This illustration shows a composite wet dust removal device and process flow provided by an embodiment of the present invention, including a wet grinding table 1, a conical wet dust removal pipe 2, a gas-water separator 3, a Venturi wet purification pipe 4, a wet spray tower 5, and a water circulation system. The wet grinding table 1 is equipped with a first spray device, the conical wet dust removal pipe 2 is equipped with a second spray device 6, the Venturi wet purification pipe 4 is equipped with a third spray device, and the wet spray tower 5 is equipped with a fourth spray device. The wet grinding table 1 passes through the conical wet dust removal pipe 2... Dust pipe 2 is connected to the gas-water separator 3. The gas-water separator 3 is connected to the Venturi wet purification pipe 4 through the first exhaust pipe 7. The Venturi wet purification pipe 4 is connected to the wet spray tower 5. The wet spray tower 5 is connected to the flue through the second exhaust pipe 8 so that the purified waste gas can be discharged outside the tower through the chimney. The water circulation system is connected to the first, second, third and fourth spray devices respectively, and collects the wastewater after each spray device is used. After sedimentation, the upper clear water is taken and recycled to each spray device for reuse.

[0025] Specifically, a water washing tank is provided below the surface of the wet polishing table 1. The first spray device is installed in the water washing tank. The first spray device is used to wet the dust and impurities entering the water washing tank. The water washing tank is also filled with washing paper, which is used to initially filter the wetted dust and impurities. The water circulation system includes a secondary circulation water tank, which is connected to the first spray device and the water washing tank. The secondary circulation water tank supplies water to the first spray device through a water supply pipeline. A drain outlet 22 is provided at the bottom of the water washing tank. Dust-laden wastewater returns to the secondary circulation water tank from the drain outlet 22 through a return water pipeline. In some specific embodiments, the secondary circulating water tank is connected to the washing tank and the first spray device to form a closed-loop circulation system. More specifically, the wastewater sprayed by the first spray device to wet dust and impurities is initially filtered through the washing paper in the washing tank and then enters the secondary circulating water tank through the return water pipe from the bottom drain outlet 22 to settle. After settling, the upper layer of clear water is reused by the first spray device through the water supply pipe, thereby reducing water waste. Other circulating water tanks have a similar mechanism and will not be described in detail. The main circulating water tank 13, the secondary circulating water tank, and other circulating water tanks all need to have their bottom sediment cleaned and the water in the tanks changed regularly to avoid dust accumulation in the circulating water pipes.

[0026] Specifically, the wet sanding table 1 is equipped with a side-suction dust inlet, a bottom-suction dust inlet, and an exhaust port 23. The side-suction dust inlet and the bottom-suction dust inlet are both connected to the exhaust port 23 to remove the exhaust gas generated during sanding. The exhaust port 23 is connected to the conical wet dust removal pipe 2 through a branch pipe 12. The wet sanding table 1 is equipped with a partition to separate the sanding space and the dust removal buffer space. The side-suction dust inlet and the bottom-suction dust inlet are configured to connect the sanding space and the dust removal buffer space. The exhaust port 23 is connected to the dust removal buffer space to suck the dust and impurities generated during sanding into the conical wet dust removal pipe 2 through the branch pipe 12. More specifically, the side-suction dust inlet and the bottom-suction dust inlet are preferably located on the partition.

[0027] Specifically, the large-diameter end of the conical wet dust collector pipe 2 is connected to the gas-water separator 3. A water tank is provided on the conical inclined surface at the bottom of the conical wet dust collector pipe 2, and a second spray device 6 is provided on the pipe wall of the top conical inclined surface opposite to the water tank. The second spray device 6 includes multiple detachable spray water tanks, and each spray water tank is provided with multiple nozzles. A spark detection device 9 and a dust concentration detection device 10 are also provided on the pipe wall of the conical wet dust collector pipe 2 near the gas-water separator 3. And a carbon dioxide fire extinguishing device 11; multiple spray water tanks are designed at intervals along the axial or length direction of the conical wet dust removal pipe 2, there are multiple wet grinding tables 1, each of the wet grinding tables 1 is connected to the conical wet dust removal pipe 2 through at least one branch pipe 12, the multiple branch pipes 12 and the multiple spray water tanks are arranged alternately on the conical wet dust removal pipe 2, and each branch pipe 12 is located at the front end of the airflow direction relative to the corresponding spray water tank.

[0028] In some specific embodiments, the nozzles of the second spray device 6 spray water droplets that come into contact with and adsorb dust particles in the dusty exhaust gas, causing the dust to increase in weight and settle into the water tank. The effects of other spray devices are similar to those of the second spray device 6, and will not be described in detail here. The wet dust removal pipe 2 is designed to be conical, and the conical end with the large diameter is connected to the gas-water separator 3, which allows the dusty wastewater in the water tank to flow towards the gas-water separator 3. In order to prevent dust from settling and accumulating and getting stuck in the conical wet dust removal pipe 2, the flow velocity in the pipe can be ≥23m / s by controlling the slope of the conical surface of the conical wet dust removal pipe 2. At the same time, the overall length of the pipe is designed to be ≤3m. The spray water tank is easy to disassemble and can be used as an inspection port, cleaning port or observation port.

[0029] Specifically, the water circulation system includes a main circulating water tank 13, which is connected to the second spray device 6. The main circulating water tank 13 has a built-in three-stage filter, a hydrogen alarm device, a temperature alarm device, a water level alarm device, and a flow monitoring alarm device. The composite wet dust removal equipment also includes a control system, which is connected to the hydrogen alarm device, the temperature alarm device, the water level alarm device, and the flow monitoring alarm device, respectively. The circulation pipe of the main circulating water tank 13 is equipped with a heat preservation structure to avoid the circulation obstruction caused by the freezing of the circulating water. More specifically, since combustible dust, such as aluminum alloy dust, reacts chemically with water to produce hydrogen gas, there is a risk of explosion when the hydrogen concentration is high and it comes into contact with an open flame. Therefore, hydrogen concentration monitoring devices are installed in the circulation pipes of the water circulation system. The control system collects the hydrogen concentration data from each hydrogen concentration monitoring device and compares it with the safety threshold. If the safety threshold is exceeded, the control system activates the hydrogen alarm device to issue a warning. The insulation structure preferably consists of an insulation layer wrapped around the outer wall of each circulation pipe and an insulation layer laid on the outer wall of the circulation water tank. The auxiliary circulation water tank and other circulation water tanks also have insulation structures, three-stage filters, and the aforementioned alarm monitoring devices.

[0030] Specifically, the gas-water separator 3 has an air outlet 14 at its top, which is connected to the first exhaust pipe 7. The gas-water separator 3 has a drain outlet at its bottom, which is connected to the water circulation system. The gas-water separator 3 has an air inlet 15 and an inlet in its middle. The inlet is connected to the conical wet dust removal pipe 2. A first fan is installed at the air inlet 15. A cyclone demister plate 16 is connected to the inner wall above the air inlet 15. The cyclone demister plate 16 is used to separate the waste gas and wastewater entering from the inlet under the action of strong centrifugal force. The wastewater is thrown towards the inner wall of the gas-water separator 3 and flows along the inner wall to the drain outlet. The waste gas is discharged from the air outlet 14.

[0031] Specifically, an explosion-proof valve 17 and an explosion relief port are provided in the first exhaust pipe 7 between the gas-water separator 3 and the Venturi wet purification pipe 4, and an explosion relief disc is installed at the explosion relief port.

[0032] Specifically, the Venturi wet scrubbing pipe 4 includes an inlet 18 and a contraction tube connected to the inlet 18. The nozzle of the third spray device is located at the inlet 18. The contraction tube significantly increases the flow velocity of the liquid sprayed from the nozzle of the third spray device, thereby causing a strong shearing effect between the high-speed flowing liquid and gas, breaking the liquid into a large number of fine droplets. The third spray device is connected to the water circulation system. More specifically, the contraction tube has a conical structure. The diameter of the inlet of the contraction tube connected to the inlet 18 is relatively large, and the diameter of the outlet of the contraction tube is reduced to about one-third of the diameter of the inlet. This forces the fluid to pass through a gradually narrowing channel. Based on the continuity equation in fluid mechanics, the flow velocity increases as the cross-sectional area decreases, so the liquid flow velocity at the end of the contraction tube is significantly increased.

[0033] In some specific embodiments, the first fan drives the cyclone demister 16 of the gas-water separator 3 to rotate at high speed, generating high-speed centrifugal force. This causes gas and wastewater to separate under the strong centrifugal force. At this time, the dust-laden gas is still rotating at high speed. The high-speed rotating dust-laden gas enters the Venturi wet scrubbing pipe 4 through the first exhaust pipe 7. Inside the Venturi wet scrubbing pipe 4, the high-speed rotating dust-laden gas mixes with the high-speed flowing liquid, intensifying liquid breakage and further refining the water mist particle size. The shear force generated by the rotational motion can more thoroughly tear the droplets, forming a more uniform atomization effect. The rotating airflow increases the gas-liquid contact area and prolongs the gas-liquid contact time, resulting in more thorough mixing. The inertial force generated by the rotation also helps to agglomerate fine dust particles and droplets, improving dust removal efficiency.

[0034] Specifically, the top of the wet spray tower 5 is provided with an exhaust port 20 and a packing demister layer 19. The exhaust port 20 is connected to the second exhaust pipe 8. A second fan 21 is installed at the exhaust port 20. The fourth spray device is located below the packing demister layer 19. The fourth spray device includes multiple layers of nozzles arranged in a grid pattern. The bottom of the wet spray tower 5 is provided with a water outlet. The fourth spray device and the water outlet are connected to the water circulation system.

[0035] In some specific embodiments, a multi-layered pipe network is preferably installed on the inner side of the middle of the wet scrubbing tower 5. Each layer of the pipe network consists of multiple interconnected, crisscrossing water pipes in a grid pattern. Multiple nozzles are evenly spaced on each water pipe. The nozzles are preferably umbrella-shaped or trumpet-shaped, designed to prevent clogging, have a wide spray angle, and distribute droplets evenly. When the second fan 21 at the top exhaust port 20 draws in air under negative pressure, the dust-laden exhaust gas enters the wet scrubbing tower 5 from the connection port with the Venturi wet scrubbing pipe 4 and rises. Dust particles in the exhaust gas are captured and settled by the spray liquid sprayed from multiple nozzles on the multi-layer pipe network to obtain purified mist. As the purified mist continues to rise and passes through the packing demister layer 19, the water vapor is physically trapped by the grid plates, baffles, multi-faceted hollow spheres or Pall ring packing in the packing demister layer 19 to obtain purified gas. Finally, the purified gas is discharged from the exhaust port 20. In addition to the function of physically trapping water vapor, the packing demister layer 19 also has another function: to effectively control the reverse return of the removed moisture into the gas and the resulting increase in humidity.

[0036] Another embodiment of the present invention provides a multi-stage purification process, which is implemented by the above-mentioned composite wet dust removal equipment and includes the following steps: Step 1: During the grinding operation, a portion of the dust-laden exhaust gas generated by the wet grinding table 1 enters the water washing tank. After being wetted by the first spray device, it undergoes preliminary filtration through water washing paper in the water washing tank, and then enters the secondary circulating water tank for sedimentation through the drain outlet 22. At the same time, another portion of the dust-laden exhaust gas generated by the wet grinding table 1 enters the conical wet dust removal pipe 2 through the side suction dust inlet, the bottom suction dust inlet, and the branch pipe 12. Step 2: Inside the conical wet dust collector pipe 2, the dust-laden exhaust gas is sprayed by the second spray device 6, causing the dust and water in the exhaust gas to mix and settle. To prevent dust from settling and accumulating inside the pipe, the flow velocity inside the pipe is ≥23m / s, and the pipe length is ≤3m. The wet dust collector pipe is designed in a conical shape so that the dust-laden wastewater in the water tank can flow towards the gas-water separator 3. To prevent dust from settling and accumulating inside the conical wet dust collector pipe 2, the slope of the conical surface of the conical wet dust collector pipe 2 can be controlled to ensure that the flow velocity inside the pipe is ≥23m / s.

[0037] Step 3: The waste gas and waste liquid purified by the conical wet dust collector 2 enter the gas-liquid separator 3. Under the action of the centrifugal high-speed rotation of the cyclone demister 16, gas-liquid separation is achieved. The separated waste water is discharged into the water circulation system through the drain outlet, and the separated waste gas enters the Venturi wet purification pipe 4 through the first exhaust pipe 7. Step 4: Inside the Venturi wet scrubbing tube 4, the exhaust gas is sprayed by a third spray device. The structure of the conical tube that accelerates the fluid causes the liquid to flow at high speed and generate a strong shearing effect with the gas, thus breaking it into fine droplets. These droplets come into full contact with the exhaust gas, further removing pollutants from the exhaust gas. Meanwhile, the dust-laden gas from the gas-liquid separator 3 still enters the Venturi wet scrubbing tube 4 in a high-speed rotating form. Inside the Venturi wet scrubbing tube 4, the high-speed rotating dust-laden gas mixes with the high-speed flowing liquid, which significantly enhances the gas-liquid mixing effect.

[0038] Step 5: The exhaust gas purified by the Venturi wet scrubbing pipe 4 enters the wet scrubbing tower 5, is sprayed by the fourth scrubbing device to obtain purified mist, and is then demisted by the packing demister layer 19 before being discharged into the flue through the second exhaust pipe 8, and finally discharged through the chimney.

[0039] In summary, this composite wet dust removal equipment employs a multi-stage spray structure consisting of a first spray device on a wet grinding table 1, a second spray device on a conical wet dust collection pipe 2, a third spray device on a Venturi wet purification pipe 4, and a fourth spray device on a wet spray tower 5. This multi-stage spray structure is combined with a gas-liquid separator 3. The dust-laden gas exiting the gas-liquid separator 3 enters the Venturi wet purification pipe 4 in a high-speed rotating state. The high-speed rotation of the dust-laden gas within the Venturi wet purification pipe 4, combined with the high-speed flowing liquid, significantly enhances the gas-liquid mixing effect, achieving efficient capture of dust particles from the dust-laden exhaust gas. In this multi-stage purification process, the dust-laden exhaust gas undergoes preliminary filtration via washing paper in a washing tank, spray sedimentation within the conical wet dust collection pipe 2, gas-liquid separation via the gas-liquid separator 3, enhanced shearing via the Venturi wet purification pipe 4, and final wet purification. The spray tower 5 thoroughly purifies the wastewater before discharge, achieving high purification efficiency. Simultaneously, the wet grinding table 1, conical wet dust collector 2, gas-water separator 3, Venturi wet purification pipe 4, and wet spray tower 5 are all connected to the water circulation system. Wastewater is reused after sedimentation, effectively reducing water waste. Furthermore, explosion-proof monitoring devices are installed at locations with high dust concentrations at the equipment's front end. Specifically, the conical wet dust collector 2 is equipped with a spark detection device 9, a dust concentration detection device 10, and a carbon dioxide fire extinguishing device 11, enabling real-time monitoring and automatic fire suppression. The main circulating water tank 13 is also equipped with a hydrogen alarm device for explosion prevention. In addition, the main circulating water tank 13 is equipped with a temperature alarm device, a water level alarm device, a flow monitoring alarm device, and an insulation structure to ensure stable operation of the equipment even in low-temperature environments, avoiding the risk of freezing or overflow.

[0040] It should be noted that the present invention is not limited to the above-described embodiments. Based on the inventive spirit of the present invention, those skilled in the art can make other changes, and these changes made in accordance with the inventive spirit of the present invention should be included within the scope of protection claimed by the present invention.

Claims

1. A composite wet dust removal device, characterized in that, The system includes a wet grinding table, a conical wet dust collector, a gas-water separator, a Venturi wet purification pipe, a wet spray tower, and a water circulation system. The wet grinding table is equipped with a first spray device, the conical wet dust collector is equipped with a second spray device, the Venturi wet purification pipe is equipped with a third spray device, and the wet spray tower is equipped with a fourth spray device. The wet grinding table is connected to the gas-water separator through the conical wet dust collector. The gas-water separator is connected to the Venturi wet purification pipe through a first exhaust pipe. The Venturi wet purification pipe is connected to the wet spray tower. The wet spray tower is connected to a flue through a second exhaust pipe so that the purified exhaust gas can be discharged outside the tower through a chimney. The water circulation system is connected to the first, second, third, and fourth spray devices respectively, and collects the wastewater after use from each spray device. After sedimentation, the upper layer of clear water is taken and recycled to each spray device for reuse.

2. The composite wet dust removal equipment as described in claim 1, characterized in that, The wet polishing table has a water washing tank below its surface. The first spray device is installed in the water washing tank and is used to wet the dust and impurities entering the water washing tank. The water washing tank also contains washing paper, which is used to initially filter the wetted dust and impurities. The water circulation system includes a secondary circulation water tank, which is connected to the first spray device and the water washing tank. The secondary circulation water tank supplies water to the first spray device through a water supply pipeline. The bottom of the water washing tank has a drain outlet, and the dusty wastewater returns to the secondary circulation water tank from the drain outlet through a return water pipeline.

3. The composite wet dust removal equipment as described in claim 1, characterized in that, The wet sanding table is equipped with a side-suction dust inlet, a bottom-suction dust inlet, and an exhaust port. The side-suction dust inlet and the bottom-suction dust inlet are both connected to the exhaust port to remove the exhaust gas generated during sanding. The exhaust port is connected to the conical wet dust removal pipe through a branch pipe. The wet sanding table is equipped with a partition to separate the sanding space and the dust removal buffer space. The side-suction dust inlet and the bottom-suction dust inlet are configured to connect the sanding space and the dust removal buffer space. The exhaust port is connected to the dust removal buffer space to draw dust and impurities generated during sanding into the conical wet dust removal pipe through the branch pipe.

4. The composite wet dust removal equipment as described in claim 1, characterized in that, The large-diameter end of the conical wet dust collector pipe is connected to the gas-water separator. A water tank is provided on the conical inclined surface at the bottom of the conical wet dust collector pipe. The second spray device is provided on the pipe wall of the top conical inclined surface opposite to the water tank. The second spray device includes multiple detachable spray water tanks. Each spray water tank is provided with multiple nozzles. A spark detection device, a dust concentration detection device, and a carbon dioxide fire extinguishing device are also provided on the pipe wall at the end of the conical wet dust collector pipe near the gas-water separator. The multiple spray water tanks are designed to be spaced apart along the axial or length direction of the conical wet dust collector pipe. There are multiple wet grinding tables. Each wet grinding table is connected to the conical wet dust collector pipe through at least one branch pipe. The multiple branch pipes and the multiple spray water tanks are arranged alternately on the conical wet dust collector pipe, and each branch pipe is located at the front end of the airflow direction relative to the corresponding spray water tank.

5. The composite wet dust removal equipment as described in claim 1, characterized in that, The water circulation system includes a main circulating water tank, which is connected to the second spray device. The main circulating water tank has a built-in three-stage filter, a hydrogen alarm device, a temperature alarm device, a water level alarm device, and a flow monitoring alarm device. The composite wet dust removal equipment also includes a control system, which is connected to the hydrogen alarm device, the temperature alarm device, the water level alarm device, and the flow monitoring alarm device, respectively. The circulation pipe of the main circulating water tank is equipped with a heat preservation structure to prevent the circulating water from freezing and causing poor flow.

6. The composite wet dust removal equipment as described in claim 1, characterized in that, The gas-water separator has an air outlet at the top, which is connected to the first exhaust pipe. The gas-water separator has a drain outlet at the bottom, which is connected to the water circulation system. The gas-water separator has an air inlet and an inlet in the middle. The inlet is connected to the conical wet dust collector pipe. A first fan is installed at the air inlet. A cyclone demister plate is connected to the inner wall above the air inlet. The cyclone demister plate is used to separate the waste gas and wastewater entering from the inlet under the action of strong centrifugal force. The wastewater is thrown towards the inner wall of the gas-water separator and flows along the inner wall to the drain outlet. The waste gas is discharged from the air outlet.

7. The composite wet dust removal equipment as described in claim 1, characterized in that, An explosion-proof valve and an explosion relief port are provided in the first exhaust pipe between the gas-water separator and the Venturi wet purification pipe, and an explosion relief disc is installed at the explosion relief port.

8. The composite wet dust removal equipment as described in claim 1, characterized in that, The Venturi wet scrubbing tube includes an inlet and a shrink tube connected to the inlet. The nozzle of the third spray device is located at the inlet. The shrink tube is used to significantly increase the flow rate of the liquid sprayed from the nozzle of the third spray device, thereby causing the high-speed flowing liquid and gas to generate a strong shearing effect and break the liquid into a large number of fine droplets. The third spray device is connected to the water circulation system.

9. A composite wet dust removal device as described in claim 1, characterized in that, The top of the wet spray tower is provided with an exhaust port and a packing demister layer. The exhaust port is connected to the second exhaust pipe. A second fan is installed at the exhaust port. The fourth spray device is located below the packing demister layer. The fourth spray device includes multiple layers of nozzles arranged in a grid pattern. The bottom of the wet spray tower is provided with a water outlet. The fourth spray device and the water outlet are connected to the water circulation system.

10. A multi-stage purification process, characterized in that, The multi-stage purification process is implemented by the composite wet dust removal equipment as described in any one of claims 1 to 9, and includes the following steps: Step 1: During the grinding operation, some of the dust-laden exhaust gas generated by the wet grinding table enters the water washing tank. After being wetted by the first spray device, it undergoes preliminary filtration through the water washing paper in the water washing tank, and then enters the secondary circulating water tank for sedimentation through the drain outlet. At the same time, another part of the dust-laden exhaust gas generated by the wet grinding table enters the conical wet dust collection pipe through the side suction port, the bottom suction port, and the branch pipe. Step 2: Inside the conical wet dust collector pipe, the dust-laden exhaust gas is sprayed by the second spray device to mix the dust and water in the exhaust gas and allow it to settle. The flow velocity inside the pipe is ≥23m / s and the pipe length is ≤3m. Step 3: The waste gas and waste liquid purified by the conical wet dust collector enter the gas-liquid separator. Under the action of the cyclone demister, gas-liquid separation is achieved. The separated waste water is discharged into the water circulation system through the drain outlet, and the separated waste gas enters the Venturi wet purification tube through the first exhaust pipe. Step 4: Inside the Venturi wet scrubbing tube, the exhaust gas is sprayed through the third spray device. The shrink tube structure breaks the liquid into fine droplets, which come into full contact with the exhaust gas to further remove pollutants from the exhaust gas. Step 5: The exhaust gas purified by the Venturi wet scrubbing pipe enters the wet scrubbing tower, is sprayed by the fourth scrubbing device to obtain purified mist, and is then demisted by the packing demister layer before being discharged into the flue through the second exhaust pipe and finally discharged through the chimney.

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