Steel-making furnace dust removal and purification device for steel-making workshop

Abstract

The dedusting and purifying device comprises a dedusting box and a dust inlet, the inner space of the dedusting box comprises an isolation cavity, a dedusting cavity and a water storage cavity, a spiral flow guide plate, a filter cylinder and a washing cylinder are sequentially arranged in the dedusting cavity from outside to inside, and a gap is reserved between the lower end of the spiral flow guide plate and a partition plate. The upper end of the filter cartridge is connected with the annular plate through a flange, the lower end of the filter cartridge abuts against the partition plate, the side wall of the filter cartridge sequentially comprises a coarse filter screen layer, an activated carbon layer and an HEPA filter screen layer from outside to inside, a downcomer is arranged on the partition plate between the HEPA filter screen layer and the washing cylinder, the upper end of the washing cylinder is fixed to the top of the dust removal box, and the lower end of the washing cylinder is communicated with the water storage cavity. And an exhaust pipe is arranged at the top of the dust removal box at the upper part in the washing cylinder. In conclusion, the device has the advantages of low treatment cost, convenience in maintenance and good purification effect.

Description

Technical Field

[0001] This utility model relates to the technical field of dust removal and purification equipment, specifically to a dust removal and purification device for steelmaking furnaces in steelmaking workshops. Background Technology

[0002] Steelmaking workshops utilize steelmaking furnaces, the main equipment for steel production, including converters and induction furnaces. These furnaces generate significant amounts of smoke and dust during the steelmaking process. This smoke and dust contains large quantities of particulate matter, sulfur, nitrogen, and other harmful substances. Direct discharge not only fails to meet national emission standards but also damages air quality, causing severe air pollution. Currently, dust removal equipment is commonly used to treat the smoke and dust emitted from steelmaking furnaces. However, existing dust removal equipment often suffers from complex structures, high costs, difficult maintenance of filter components, and unsatisfactory dust purification effects, resulting in significant environmental pollution after discharge. Therefore, developing a low-cost, easy-to-maintain, and highly effective dust removal and purification device for steelmaking workshops is objectively necessary. Utility Model Content

[0003] The purpose of this utility model is to provide a dust removal and purification device for steelmaking furnaces in steelmaking workshops that has low processing costs, convenient maintenance, and good purification effect.

[0004] The purpose of this utility model is achieved as follows: It includes a dust collection box and a dust inlet. The internal space of the dust collection box is divided from top to bottom into an isolation chamber, a dust collection chamber, and a water storage chamber by a ring plate and a partition. The dust inlet communicates with the dust collection chamber. Inside the dust collection chamber, from the outside to the inside, a spiral guide plate, a filter cylinder, and a washing cylinder are arranged sequentially. The upper end of the spiral guide plate is fixed to the ring plate, and a gap is left between the lower end and the partition. The upper end of the filter cylinder is connected to the ring plate via a flange, and the lower end of the filter cylinder rests against the partition. The cross-sectional shape of the filter cylinder's sidewall is a U-shaped structure with an open upper end and a closed lower end. The sidewall of the filter cylinder, from the outside to the inside, includes a coarse filter layer, an activated carbon layer, and a HEPA filter layer. A downcomer is provided on the partition between the HEPA filter layer and the washing cylinder. The upper end of the washing cylinder is fixed to the top of the dust collection box, and the lower end communicates with the water storage chamber. A nozzle assembly is provided inside the washing cylinder, and an exhaust pipe is provided on the top of the dust collection box above the washing cylinder.

[0005] Furthermore, a dehumidifier is installed inside the washing drum above the nozzle assembly.

[0006] Furthermore, the nozzle assembly includes a central riser and nozzles evenly distributed on the central riser.

[0007] Furthermore, a sedimentation tank is installed on the outside of the dust collector box, and the bottom of the water storage chamber is connected to the sedimentation tank through a drain pipe. The upper end of the central vertical pipe extends out of the top of the dust collector box and is connected to the supernatant liquid layer of the sedimentation tank through a pipeline.

[0008] Furthermore, a stirrer is installed at the bottom of the water storage chamber, and an air equalizer is installed at the lower end of the downcomer that extends into the water storage chamber.

[0009] Furthermore, an annular groove is machined on the partition plate, the lower end of the filter cylinder is embedded in the interior of the annular groove, and a sealing gasket is provided between the lower end of the filter cylinder and the bottom of the annular groove.

[0010] Furthermore, the upper surface of the partition is machined into a conical surface that is high in the middle and low at the edges, and a dust discharge port is provided on the side wall of the dust removal chamber at the lowest point of the conical surface.

[0011] In operation, this invention connects the dust inlet to the steelmaking furnace in the steelmaking workshop. The flue gas generated by the steelmaking furnace enters the dust removal chamber through the dust inlet and flows in the spiral channel formed by the spiral guide plate. At this time, the flue gas is in a spiral flow state. Under the action of centrifugal force, large dust particles and impurities in the flue gas are thrown out, completing the initial filtration of the flue gas. Then, it passes through the coarse filter layer, the activated carbon layer, and the HEPA filter layer in sequence. The coarse filter layer is used to further remove large dust particles and impurities in the flue gas. The activated carbon layer is used to adsorb particulate impurities in the flue gas and remove odors and some harmful substances in the flue gas. The HEPA filter layer is used to remove small dust particles and various suspended matter in the flue gas. After the above dry dust removal, the flue gas is passed into the liquid in the water storage chamber through the downcomer, where it comes into contact with the liquid and reacts. Then, it rises into the washing drum and comes into contact with the liquid droplets sprayed from the nozzle assembly, further removing dust particles in the flue gas. At the same time, harmful substances in the flue gas react with the liquid and are removed, finally resulting in relatively pure flue gas being discharged. In the above process, the flue gas undergoes centrifugal dust removal, filtration dust removal, adsorption dust removal, and washing dust removal processes in sequence. The device integrates the structures of dry and wet dust removal, and the combination of the two can achieve good dust removal effect and high dust removal efficiency. Furthermore, its compact structure eliminates the need for additional dust removal equipment, resulting in lower investment and operating costs. In addition, the main component for physical filtration of flue gas in this device is the filter cartridge. The coarse filter layer, activated carbon layer, and HEPA filter layer of the filter cartridge are prone to clogging. Cleaning and maintenance are simple: just open the top cover of the dust collection box, loosen the flange bolts on the ring plate, and the entire filter cartridge can be removed. Then, the coarse filter layer and HEPA filter can be cleaned, and the activated carbon can be regenerated or replaced. After maintenance, it can be reinstalled in the dust collection box. This method allows for convenient and quick cleaning and maintenance of the filter cartridge, ensuring its filtration effect on flue gas. In summary, this invention has the advantages of low processing cost, convenient maintenance, and good purification effect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] In the diagram: 1-Dust collector, 2-Isolation chamber, 3-Dust collection chamber, 4-Water storage chamber, 5-Spiral guide plate, 6-Washing drum, 7-Flange, 8-Coarse filter layer, 9-Activated carbon layer, 10-HEPA filter layer, 11-Downcomer, 12-Exhaust pipe, 13-Dehumidifier, 14-Central riser, 15-Spray nozzle, 16-Sedimentation tank, 17-Agitator, 18-Gas equalizer, 19-Sealing gasket, 20-Dust outlet, 21-Ring plate, 22-Baffle plate. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0015] like Figure 1 As shown, this utility model includes a dust collector 1 and a dust inlet. The internal space of the dust collector 1 is divided from top to bottom into an isolation chamber 2, a dust collection chamber 3, and a water storage chamber 4 by an annular plate 21 and a partition plate 22. The dust inlet communicates with the dust collection chamber 3. Inside the dust collection chamber 3, a spiral guide plate 5, a filter cylinder, and a washing cylinder 6 are arranged from the outside to the inside. The upper end of the spiral guide plate 5 is fixed to the annular plate 21, and a gap is left between the lower end and the partition plate 22. The upper end of the filter cylinder is connected to the annular plate 21 through a flange 7, and the lower end of the filter cylinder abuts against the partition plate 22. On plate 22, the cross-sectional shape of the filter cylinder sidewall is a U-shaped structure with an open top and a closed bottom. The sidewall of the filter cylinder includes a coarse filter layer 8, an activated carbon layer 9, and a HEPA filter layer 10 from the outside to the inside. A downcomer 11 is provided on the partition plate 22 between the HEPA filter layer 10 and the washing cylinder 6. The upper end of the washing cylinder 6 is fixed to the top of the dust collection box 1, and the lower end is connected to the water storage chamber 4. A nozzle assembly is provided inside the washing cylinder 6, and an exhaust pipe 12 is provided on the top of the dust collection box 1 above the washing cylinder 6.

[0016] In operation, this utility model connects the dust inlet to the steelmaking furnace in the steelmaking workshop. The flue gas generated by the furnace enters the dust removal chamber 3 through the dust inlet and flows within the spiral channel formed by the spiral guide plate 5. At this time, the flue gas flows in a spiral state. Under the action of centrifugal force, large particles of dust and impurities in the flue gas are thrown out, completing the initial filtration of the flue gas. Subsequently, it passes sequentially through the coarse filter layer 8, the activated carbon layer 9, and the HEPA filter layer 10. The coarse filter layer 8 is used to further remove large particles of dust and impurities from the flue gas, and the activated carbon layer 9 is used to further remove large particles of dust and impurities. The HEPA filter layer 10 adsorbs particulate impurities in the smoke and removes odors and some harmful substances. It is used to remove small dust particles and various suspended matter in the smoke. After the smoke passes through the above-mentioned dry dust removal, it is passed into the liquid in the water storage chamber 4 through the downcomer 11, where it comes into contact with the liquid and reacts. Then it rises into the washing drum 6 and comes into contact with the liquid droplets sprayed from the nozzle assembly. At the same time, the dust particles in the smoke are further removed, and the harmful substances in the smoke react with the liquid and are removed, resulting in relatively pure smoke being discharged.

[0017] In the above process, the flue gas undergoes centrifugal dust removal, filtration dust removal, adsorption dust removal, and washing dust removal processes in sequence. The device integrates the structures of dry dust removal and wet dust removal. The combination of the two can achieve a good dust removal effect and has a high dust removal efficiency. Moreover, the structure is compact and does not require additional dust removal equipment. Compared with other devices, the investment and operating costs are lower. In addition, the main component used for physical filtration of flue gas in this device is the filter cartridge. The coarse filter layer 8, activated carbon layer 9, and HEPA filter layer 10 of the filter cartridge are prone to clogging. When cleaning and maintaining, it is only necessary to open the top cover of the dust collection box 1 and then loosen the flange bolts 7 on the ring plate 21 to remove the entire filter cartridge. Then, the coarse filter layer 8 and HEPA filter layer 10 can be cleaned, and the activated carbon can be regenerated or replaced. After maintenance, it can be put back into the dust collection box 1. The above method allows for convenient and quick cleaning and maintenance of the filter cartridge, ensuring the filtration effect of the filter cartridge on flue gas.

[0018] A dehumidifier 13 is installed inside the washing drum 6 above the nozzle assembly. The dehumidifier 13 is existing technology. In this utility model, a wet dust removal method is adopted, which will result in the exhaust gas containing a large amount of liquid medicine. At the same time, the liquid medicine will also carry a certain amount of dust and impurities. The dehumidifier 13 can block the liquid medicine and cause the liquid medicine to continuously gather into large particles and drip down, thereby achieving further purification of the exhaust gas.

[0019] Preferably, the nozzle assembly includes a central vertical pipe 14 and nozzles 15 evenly distributed on the central vertical pipe 14. The liquid first enters the central vertical pipe 14 and then is sprayed out from each nozzle 15. The multi-level structure is used to wash the smoke and dust, which can improve the washing efficiency of the smoke and dust and has a better washing effect.

[0020] A sedimentation tank 16 is installed on the outside of the dust collector 1. The bottom of the water storage chamber 4 is connected to the sedimentation tank 16 through a drain pipe. The upper end of the central vertical pipe 14 extends out of the top of the dust collector 1 and is connected to the supernatant layer of the sedimentation tank 16 through a pipeline. In this device, the washing of flue gas has two parts: the first is the preliminary washing inside the water storage chamber 4, and the second is the secondary washing inside the washing drum 6. The dust and impurities in the flue gas are discharged into the sedimentation tank 16 along with the chemical solution, where they are separated by sedimentation. In actual production, in order to obtain a better dust removal effect, the amount of chemical solution is often large. Thus, the discharged chemical solution still contains a large amount of chemical solution components. Returning it to the dust collector 1 to continue participating in the dust removal work can save the amount of chemical solution used, reduce the cost of using the chemical solution, and also allow for the recycling of water resources, reducing water waste.

[0021] A stirrer 17 is installed at the bottom of the water storage chamber 4, and a gas equalizer 18 is installed after the lower end of the downcomer extends into the water storage chamber 4. Both the stirrer 17 and the gas equalizer 18 are existing technologies. The stirrer 17 is used to agitate the medicinal liquid in the water storage chamber 4, making the medicinal liquid flow, increasing the probability of contact between the medicinal liquid and the smoke, and thus improving the reaction effect between the medicinal liquid and the smoke. The gas equalizer 18 is used to evenly disperse the smoke in the medicinal liquid, also to increase the probability of contact between the medicinal liquid and the smoke, and thus improve the reaction effect between the medicinal liquid and the smoke.

[0022] An annular groove is machined on the partition plate 22. The lower end of the filter cartridge is embedded in the annular groove, and a sealing gasket 19 is provided between the lower end of the filter cartridge and the bottom of the annular groove. In this device, the lower end of the filter cartridge rests against the partition plate 22. However, in actual production, it was found that some unfiltered dust still passes through the gap between the lower end of the filter cartridge and the partition plate 22, thereby reducing the filtration effect of the dust. To avoid the above problem, the groove and the sealing gasket 19 are provided to ensure a good seal between the lower end of the filter cartridge and the bottom of the groove, thus ensuring the filtration effect of the dust.

[0023] The upper surface of the partition 22 is machined into a conical surface with a high center and low edges. A dust discharge port 20 is provided on the side wall of the dust removal chamber 1 at the lowest point of the conical surface. When this utility model is in operation, the smoke and dust will first enter the spiral channel in the dust removal chamber 3. The spiral channel is formed by the spiral guide plate 5. When the smoke and dust spirals in the spiral channel, large dust particles and impurities are thrown out under the action of centrifugal force and fall continuously onto the partition 22. As the device is used for a longer period of time, more and more dust will accumulate. In order to facilitate the cleaning of this dust, the upper surface of the partition 22 is set into a conical structure with a high center and low edges. The dust will automatically slide outwards and finally be discharged from the dust discharge port 20. The number, position, size and shape of the dust discharge ports 20 can be determined according to actual needs.

Claims

1. A dust removal and purification device for steelmaking furnaces in a steelmaking workshop, comprising a dust collection box (1) and a dust inlet, characterized in that: The internal space of the dust collector (1) is divided into an isolation chamber (2), a dust collection chamber (3), and a water storage chamber (4) from top to bottom by an annular plate (21) and a partition plate (22). The dust inlet is connected to the dust collection chamber (3). The dust collection chamber (3) is provided with a spiral guide plate (5), a filter cylinder, and a washing cylinder (6) from the outside to the inside. The upper end of the spiral guide plate (5) is fixed to the annular plate (21), and the lower end is left with a gap between it and the partition plate (22). The upper end of the filter cylinder is connected to the annular plate (21) through a flange (7), and the lower end of the filter cylinder abuts against the partition plate (22). The cross-sectional shape of the side wall of the filter cylinder is a U-shaped structure with an open top and a closed bottom. The side wall of the filter cylinder includes a coarse filter layer (8), an activated carbon layer (9), and a HEPA filter layer (10) from the outside to the inside. A downcomer (11) is provided on the partition (22) between the HEPA filter layer (10) and the washing cylinder (6). The upper end of the washing cylinder (6) is fixed to the top of the dust collection box (1), and the lower end is connected to the water storage chamber (4). A nozzle assembly is provided inside the washing cylinder (6), and an exhaust pipe (12) is provided on the top of the dust collection box (1) above the washing cylinder (6).

2. The dust removal and purification device for steelmaking furnaces in a steelmaking workshop according to claim 1, characterized in that: A dehumidifier (13) is installed inside the washing drum (6) above the nozzle assembly.

3. The dust removal and purification device for steelmaking furnaces in a steelmaking workshop according to claim 1, characterized in that: The nozzle assembly includes a central vertical tube (14) and nozzles (15) evenly distributed on the central vertical tube (14).

4. The dust removal and purification device for steelmaking furnaces in a steelmaking workshop according to claim 3, characterized in that: A sedimentation tank (16) is provided on the outside of the dust collector (1). The bottom of the water storage chamber (4) is connected to the sedimentation tank (16) through a drain pipe. The upper end of the central vertical pipe (14) extends out of the top of the dust collector (1) and is connected to the supernatant layer of the sedimentation tank (16) through a pipeline.

5. The dust removal and purification device for steelmaking furnaces in a steelmaking workshop according to claim 1, characterized in that: A stirrer (17) is installed at the bottom of the water storage chamber (4), and an air equalizer (18) is installed at the lower end of the downcomer after it extends into the water storage chamber (4).

6. The dust removal and purification device for steelmaking furnaces in a steelmaking workshop according to claim 1, characterized in that: The partition (22) is machined with an annular groove, the lower end of the filter cylinder is embedded in the annular groove, and a sealing gasket (19) is provided between the lower end of the filter cylinder and the bottom of the annular groove.

7. The dust removal and purification device for steelmaking furnaces in a steelmaking workshop according to claim 1, characterized in that: The upper surface of the partition (22) is processed into a conical surface with a high center and a low edge, and a dust discharge port (20) is provided on the side wall of the dust removal chamber (3) at the lowest position of the conical surface.

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