A dry purification device for converter flue gas

Abstract

This invention provides a dry purification device for converter flue gas, belonging to the field of flue gas purification. It includes a support leg, with a separation component for efficiently separating gaseous and solid impurities fixedly installed on the top of the support leg. A purification component for deep gas purification is fixedly installed on one side of the separation component. In this invention, when dust-laden gas enters the cylinder at high speed through the inlet, a rotating airflow is formed inside the cylinder. Centrifugal force causes larger dust particles to be thrown against the cylinder wall and, under gravity, slide down the wall to the bottom funnel. The discharge rhythm is controlled by a discharge valve threaded around the funnel. The dust finally falls into the ash bin, completing the initial separation. The HEPA filter cartridge, with its high-efficiency fiber structure, can intercept particles larger than 0.3μm. The purified clean gas enters the variable frequency fan through the HEPA filter cartridge outlet and inlet pipe. The variable frequency fan adjusts its speed in real time to precisely match the output air volume and air pressure to actual needs.

Description

Technical Field

[0001] This utility model relates to the field of flue gas purification, and more specifically, to a dry purification device for converter flue gas. Background Technology

[0002] The innovation of dry purification equipment for converter flue gas is the core engine for the steel industry to move towards green and low-carbon development. Faced with the bottlenecks of high water consumption, secondary pollution and inefficient utilization of waste heat in traditional wet processes, dry technology stands out with its advantages of water and energy saving and efficient dust removal. In recent years, my country has further achieved ultra-low emissions and efficient energy utilization through breakthroughs in key technologies such as metal membrane precision filtration and intelligent pulse cleaning.

[0003] A search revealed that Chinese Patent Publication No. CN209828707U discloses "a completely dry flue gas purification device, which includes a boiler, a pre-dust collector, a mixing reactor, a bag filter, an induced draft fan, and a chimney arranged sequentially. The boiler includes at least a furnace and a flue. The flue includes at least a heat exchange device and an economizer. A first desulfurization device is provided outside the boiler and is connected to the furnace. An SCR reactor is connected to the flue and is located between the heat exchange device and the economizer. The flue is connected to a second desulfurization device, which is located at the inlet of the economizer. The mixing reactor is connected to a third desulfurization device. The first to third desulfurization devices are respectively filled with a first desulfurizing agent, a second desulfurizing agent, and a third desulfurizing agent in the form of solid particles or powder. This completely dry flue gas purification device has a small footprint, low operating energy consumption, high reaction efficiency, and the purification process does not consume water or generate wastewater." However, it still has the following drawbacks:

[0004] (1) In actual use, the device will cause uneven flow field distribution by using a traditional pre-dust collector, and there will be a "short-circuit flow" in the central area, resulting in a high escape rate of fine particles.

[0005] (2) In actual use, this device cannot deeply purify the SO2 and HCl acid gases contained in the gas, which will cause the conventional filter bags to corrode easily, resulting in excessive emission concentrations. To address this, a dry purification device for converter flue gas is proposed. Utility Model Content

[0006] The purpose of this invention is to address the problems of uneven flow field distribution and "short-circuit flow" in the central region caused by the use of traditional pre-dust collectors in existing devices, resulting in a high escape rate of fine particles; the inability of such devices to deeply purify SO2 and HCl acidic gases in the gas, leading to easy corrosion of conventional filter bags and excessive emission concentrations. This invention provides a dry purification device for converter flue gas to solve the problems mentioned in the background.

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0008] The present invention is as follows: a dry purification device for converter flue gas, including a support leg, a separation component for efficiently separating gaseous and solid impurities is fixedly installed on the top of the support leg, and a purification component for deep purification of the gas is fixedly installed on one side of the separation component.

[0009] The separation assembly includes a cylindrical body fixedly mounted on the top of a support leg, an air inlet on the periphery of the cylindrical body, a discharge port on the bottom of the cylindrical body, a funnel fixedly mounted on the bottom of the cylindrical body, a discharge valve threaded on the periphery of the funnel, an ash bucket at the bottom of the funnel, a HEPA filter cartridge fixedly mounted on the top of the cylindrical body, a placement rack fixedly mounted on one side of the support leg, a variable frequency fan fixedly mounted on the top of the placement rack, and an air inlet pipe fixedly mounted on the air inlet of the variable frequency fan, which communicates with the air outlet of the HEPA filter cartridge.

[0010] As a preferred technical solution of this utility model, the purification component includes a housing fixedly installed on the top of the placement rack, the air outlet of the variable frequency fan is connected to one side of the housing, a perforated partition is fixedly installed inside the housing, six filter bags are snapped onto the perforated partition, a shaping plate is fixedly installed on the side of the six filter bags away from the perforated partition, an exhaust port is opened on one side of the housing, and an exhaust pipe is fixedly installed on the exhaust port.

[0011] As a preferred technical solution of this utility model, a pulse gas storage tank is fixedly installed on the top of the housing, and an electromagnetic pulse valve is connected to the outlet of the pulse gas storage tank. A pressure sensor is fixedly installed on the top of the housing, and a pulse controller is provided on the pressure sensor. A blowpipe is fixedly installed at the outlet of the electromagnetic pulse valve, and three air pipes are connected to the blowpipe. Two jet nozzles are fixedly installed on each of the three air pipes, and the two jet nozzles are located above the filter bag.

[0012] As a preferred technical solution of this utility model, an explosion-proof device is fixedly installed on one side of the housing, and an alarm is fixedly installed on one side of the explosion-proof device, with an indicator light provided on the alarm.

[0013] As a preferred technical solution of this utility model, an ash hopper is fixedly installed at the bottom of the shell, and a discharge plate is inserted into the ash hopper.

[0014] As a preferred technical solution of this utility model, hooks are fixedly installed on both sides of the ash hopper, and the hooks can be used to hang ash collection bags.

[0015] As a preferred technical solution of this utility model, a filter is threadedly installed on the exhaust pipe, and two activated carbon filter screens are fixedly installed inside the filter.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. By setting up a separation component, when dust-laden gas enters the cylinder at high speed through the air inlet on the side of the cylinder, a rotating airflow is formed inside the cylinder. Centrifugal force is used to throw larger dust particles toward the cylinder wall and they slide down the wall to the bottom funnel under the action of gravity. The discharge rhythm is controlled by the discharge valve installed on the threaded side of the funnel. The dust finally falls into the ash bucket to complete the initial separation. The remaining fine particles rise with the airflow to the top HEPA filter cartridge. Its high-efficiency fiber structure can intercept particles larger than 0.3μm. The purified clean gas enters the variable frequency fan through the air outlet of the HEPA filter cartridge and the air inlet pipe. The variable frequency fan adjusts the fan speed in real time to make the output air volume and air pressure accurately match the actual needs.

[0018] 2. By setting up a purification component, the dust-laden flue gas enters the purification component after initial separation during use. Dust accumulates on the surface of the filter bag, increasing resistance. When the pressure sensor at the top of the housing detects that the pressure difference between the inside and outside of the filter bag reaches the set value, the pulse controller immediately triggers the electromagnetic pulse valve to open. High-pressure air in the pulse storage tank is split into six jet nozzles through the blowpipe and sprayed at high speed onto the top of the filter bag, causing the filter bag to expand and vibrate instantly. The dust layer falls off into the ash hopper. After the cleaning is completed, the electromagnetic pulse valve closes, the filter bag resumes filtration, and the pressure sensor continuously monitors the pressure difference and starts the next round of cleaning. This achieves dynamic balance of filter bag resistance, ensuring long-term, efficient, and stable operation of the device and effectively meeting the purification needs of high-temperature, high-humidity, and highly viscous dust in converter flue gas. Attached Figure Description

[0019] Figure 1 A schematic diagram of the dry purification device for converter flue gas provided by this utility model;

[0020] Figure 2 Right view of the dry purification device for converter flue gas provided by this utility model;

[0021] Figure 3 The converter flue gas dry purification device provided by this utility model Figure 2 A schematic diagram of the three-dimensional cross-sectional structure at point AA;

[0022] Figure 4 A schematic diagram of the ash hopper of the dry purification device for converter flue gas provided by this utility model;

[0023] Figure 5 The converter flue gas dry purification device provided by this utility model Figure 4 A schematic diagram of the three-dimensional cross-sectional structure at point BB;

[0024] Figure 6 A schematic diagram of the filter structure of the dry purification device for converter flue gas provided by this utility model;

[0025] Figure 7 A schematic diagram of the purification component of the dry purification device for converter flue gas provided by this utility model;

[0026] Figure 8 The converter flue gas dry purification device provided by this utility model Figure 5 Enlarged view of point A in the middle.

[0027] The diagram shows: 1. Support leg; 2. Separation component; 3. Purification component; 201. Cylinder; 202. Air inlet; 203. Discharge port; 204. Funnel; 205. Discharge valve; 206. Ash bucket; 207. HEPA filter cartridge; 208. Placement rack; 209. Variable frequency fan; 210. Air inlet pipe; 301. Shell; 302. Perforated baffle; 303. Filter bag; 304. Shaping plate; 305. Exhaust port; 306. Exhaust pipe; 4. Pulse gas storage tank; 5. Electromagnetic pulse valve; 6. Pressure sensor; 7. Pulse controller; 8. Blowpipe; 9. Air pipe; 10. Jet nozzle; 11. Explosion-proof device; 12. Alarm; 13. Signal light; 14. Ash bucket; 15. Discharge plate; 16. Hook; 17. Filter; 18. Activated carbon filter. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0029] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0030] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] like Figure 1As shown, this embodiment proposes a dry purification device for converter flue gas, including a support leg 1. A separation component 2 for efficiently separating gaseous and solid impurities is fixedly installed on the top of the support leg 1, and a purification component 3 for deep purification of the gas is fixedly installed on one side of the separation component 2.

[0033] like Figure 3 As shown, the separation assembly 2 includes a cylindrical body 201 fixedly mounted on the top of the support leg 1. An air inlet 202 is provided on the periphery of the cylindrical body 201, and a discharge port 203 is provided at the bottom of the cylindrical body 201. A funnel 204 is fixedly mounted at the bottom of the cylindrical body 201, and a discharge valve 205 is threaded onto the periphery of the funnel 204. A dust bin 206 is located at the bottom of the funnel 204. A HEPA filter cartridge 207 is fixedly mounted on the top of the cylindrical body 201. The HEPA filter cartridge 207 can efficiently capture fine particulate matter in the air. A placement rack 208 is fixedly mounted on one side of the support leg 1, and a variable frequency fan 209 is fixedly mounted on the top of the placement rack 208. The variable frequency fan 209 can precisely control the motor speed through variable frequency speed regulation technology, achieving flexible adjustment of air volume and air pressure. An air inlet pipe is fixedly mounted on the air inlet 202 of the variable frequency fan 209. 210 is connected to the air outlet of HEPA filter cartridge 207. During use, when dust-laden gas enters the interior of cylinder 201 at high speed through air inlet 202 on the periphery of cylinder 201, a rotating airflow is formed inside cylinder 201. Centrifugal force causes larger dust particles to be thrown against the cylinder wall and slide down the wall surface to the bottom funnel 204 under the action of gravity. The discharge rhythm is controlled by the discharge valve 205 installed on the periphery of funnel 204. The dust finally falls into ash bin 206 to complete the initial separation. The remaining fine particles rise with the airflow to the top HEPA filter cartridge 207. Its high-efficiency fiber structure can intercept particles larger than 0.3μm. The purified clean gas enters the variable frequency fan 209 through air inlet 210 through the air outlet of HEPA filter cartridge 207. The variable frequency fan 209 adjusts the fan speed in real time to make the output air volume and air pressure accurately match the actual needs.

[0034] like Figure 4 and Figure 8As shown, the purification component 3 includes a housing 301 fixedly mounted on the top of the placement rack 208. The air outlet of the variable frequency fan 209 is connected to one side of the housing 301. A perforated partition 302 is fixedly installed inside the housing 301. Six filter bags 303 are snapped onto the perforated partition 302. A shaping plate 304 is fixedly installed on the side of the six filter bags 303 away from the perforated partition 302. The shaping plate 304 can ensure the stability of the filter bags 303 under the impact of high-speed airflow through rigid support and precise positioning. One side of the housing 301 is open. An exhaust vent 305 is provided, and an exhaust pipe 306 is fixedly installed on the exhaust vent 305. During use, the gas that has undergone initial purification will enter the main filtration area through the outlet of the variable frequency fan 209. Six filter bags 303, which are fixed and tensioned by the shaping plate 304, use polytetrafluoroethylene membrane filter material with a dense surface and internal gradient structure to deeply intercept and adsorb fine particulate matter in the airflow. After passing through the filter bags 303, the clean gas is gathered to the exhaust area through the guide holes of the perforated partition plate 302, and finally discharged through the exhaust pipe 306 connected to the exhaust vent 305.

[0035] like Figure 4 and Figure 7 and Figure 8 As shown, a pulse gas storage tank 4 is fixedly installed on the top of the housing 301. An electromagnetic pulse valve 5 is connected to the outlet of the pulse gas storage tank 4. A pressure sensor 6 is fixedly installed on the top of the housing 301, and a pulse controller 7 is mounted on the pressure sensor 6. A blowpipe 8 is fixedly installed at the outlet of the electromagnetic pulse valve 5, and three air pipes 9 are connected to the blowpipe 8. Two jet nozzles 10 are fixedly installed on each of the three air pipes 9, and both jet nozzles 10 are located above the filter bag 303. During use, the dust-laden flue gas enters the purification component 3 after preliminary separation. Dust accumulates on the surface of the filter bag 303, increasing the resistance. When the pressure transmission at the top of the housing 301... When sensor 6 detects that the pressure difference between the inside and outside of filter bag 303 has reached the set value, pulse controller 7 immediately triggers electromagnetic pulse valve 5 to open. High-pressure air in pulse storage tank 4 is diverted to six jet nozzles 10 through blowpipe 8 and sprayed at high speed onto the top of filter bag 303, causing filter bag 303 to expand and vibrate instantly. The dust layer falls off into ash hopper 14. After the dust removal is completed, electromagnetic pulse valve 5 closes and filter bag 303 resumes filtration. Pressure sensor 6 continuously monitors the pressure difference and starts the next round of dust removal, realizing dynamic balance of resistance of filter bag 303, ensuring long-term efficient and stable operation of the device, and effectively meeting the purification needs of high temperature, high humidity and high viscosity dust in converter flue gas.

[0036] like Figure 7As shown, an explosion-proof device 11 is fixedly installed on one side of the housing 301, and an alarm 12 is fixedly installed on one side of the explosion-proof device 11. The alarm 12 is equipped with an indicator light 13. When in use in a flammable and explosive environment, the explosion-proof device 11 on one side of the housing 301, through its high-strength explosion-proof shell and multiple sealing structures, completely seals the internal local explosion energy that may be caused by electric sparks, high temperatures, or abnormal pressure within the cavity, preventing the leakage of flames and shock waves. When the pressure sensor 6 or gas detector built into the explosion-proof device 11 detects that the housing 301... When the concentration of combustible gas inside exceeds the standard, its electronic control module immediately triggers the alarm 12 to issue a high-frequency audible and visual alarm. At the same time, the indicator light 13 on the alarm 12 changes from solid green to flashing red, warning the operator to stop the machine for inspection immediately. If the pressure continues to rise to the safety valve set value, the explosion-proof device 11 automatically opens the pressure relief channel to release the pressure, ensuring that the equipment does not explode. The whole process, through the passive protection of the explosion-proof device 11 and the active early warning linkage of the alarm 12, builds a three-level safety barrier of "monitoring-early warning-pressure relief" to minimize the risk of explosion.

[0037] like Figure 4 As shown, a dust hopper 14 is fixedly installed at the bottom of the housing 301, and a discharge plate 15 is inserted into the dust hopper 14. During use and purification, dust settles and accumulates in the dust hopper 14 at the bottom of the housing 301. When cleaning is required, the discharge plate 15 is pulled out and the dust is discharged by gravity. Then the discharge plate 15 is inserted back to reset the seal, preventing gas leakage and dust scattering, thus achieving efficient and sealed dust cleaning.

[0038] like Figure 4 As shown, hooks 16 are fixedly installed on both sides of the ash hopper 14. The hooks 16 can be used to hang ash collection bags. When dust accumulates in the ash hopper 14 and needs to be cleaned, the hanging ropes at both ends of the ash collection bag are respectively put on the hooks 16 on both sides of the ash hopper 14 and fixed. After the unloading plate 15 is opened, the dust falls directly into the bag. After it is full, the bag is removed, sealed and transported. The hook 16 design makes the ash collection process convenient, dustproof and avoids secondary pollution.

[0039] like Figure 2 As shown, a filter 17 is threadedly installed on the exhaust pipe 306. Two activated carbon filter screens 18 are fixedly installed inside the filter 17. When the airflow containing harmful gases flows through the exhaust pipe 306, it passes through the filter 17 which is threadedly tightened. The two layers of activated carbon filter screens 18, with their porous structure, efficiently adsorb organic pollutants, odor molecules and some particulate matter in the gas. The clean air after double purification is discharged from the exhaust pipe 306 to ensure that the emissions meet the standards.

[0040] Specifically, in use, the dry purification device for converter flue gas operates as follows: When dust-laden gas enters the cylinder 201 at high speed through the air inlet 202 on the periphery of the cylinder 201, a rotating airflow is formed inside the cylinder 201. Centrifugal force causes larger dust particles to be thrown against the cylinder wall and, under gravity, slide down the wall to the bottom funnel 204. The discharge rhythm is controlled by the unloading valve 205 threaded around the funnel 204. The dust finally falls into the ash bin 206, completing the initial separation. The remaining fine particles rise with the airflow to the top HEPA filter cartridge 207. Its high-efficiency fiber structure can intercept particles larger than 0.3μm. The purified clean gas enters the variable frequency fan 209 through the air outlet of the HEPA filter cartridge 207 and the air inlet pipe 210. The variable frequency fan 209 adjusts the fan speed in real time to adjust the output air volume and airflow. The pressure is precisely matched to the actual needs. After the dust-laden flue gas is initially separated, it enters the purification component 3. Dust accumulates on the surface of the filter bag 303, causing the resistance to increase. When the pressure sensor 6 at the top of the housing 301 detects that the pressure difference between the inside and outside of the filter bag 303 reaches the set value, the pulse controller 7 immediately triggers the electromagnetic pulse valve 5 to open. The high-pressure air in the pulse air tank 4 is diverted to the six jet nozzles 10 through the blowpipe 8 and sprayed at a high speed onto the top of the filter bag 303, causing the filter bag 303 to expand and vibrate instantly. The dust layer falls off into the ash hopper 14. After the dust removal is completed, the electromagnetic pulse valve 5 closes, the filter bag 303 resumes filtration, and the pressure sensor 6 continuously monitors the pressure difference and starts the next round of dust removal. This achieves dynamic balance of the resistance of the filter bag 303, ensuring long-term efficient and stable operation of the device and effectively meeting the purification needs of high temperature, high humidity, and high viscosity dust in converter flue gas.

[0041] All technical features in this embodiment can be freely combined according to actual needs.

[0042] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A device for the full dry cleaning of converter fumes, comprising support legs (1), characterised in that, The top of the support leg (1) is fixedly installed with a separation component (2) for efficient separation of gaseous and solid impurities, and a purification component (3) for deep purification of gas is fixedly installed on one side of the separation component (2). The separation assembly (2) includes a cylinder (201) fixedly installed on the top of the support leg (1), an air inlet (202) is provided on the periphery of the cylinder (201), a discharge port (203) is provided on the bottom of the cylinder (201), a funnel (204) is fixedly installed on the bottom of the cylinder (201), a discharge valve (205) is threaded on the periphery of the funnel (204), a ash bucket (206) is provided at the bottom of the funnel (204), a HEPA filter cartridge (207) is fixedly installed on the top of the cylinder (201), a placement rack (208) is fixedly installed on one side of the support leg (1), a variable frequency fan (209) is fixedly installed on the top of the placement rack (208), an air inlet pipe (210) is fixedly installed on the air inlet (202) of the variable frequency fan (209) and communicates with the air outlet of the HEPA filter cartridge (207).

2. A device for full dry cleaning of converter fumes according to claim 1, characterized in that, The purification component (3) includes a housing (301) fixedly installed on the top of the placement rack (208), the air outlet of the variable frequency fan (209) is connected to one side of the housing (301), a perforated partition (302) is fixedly installed inside the housing (301), six filter bags (303) are snapped onto the perforated partition (302), a shaping plate (304) is fixedly installed on the side of the six filter bags (303) away from the perforated partition (302), an exhaust port (305) is opened on one side of the housing (301), and an exhaust pipe (306) is fixedly installed on the exhaust port (305).

3. A device for full dry cleaning of converter fumes according to claim 2, characterized in that, A pulse gas storage tank (4) is fixedly installed on the top of the housing (301). An electromagnetic pulse valve (5) is connected to the outlet of the pulse gas storage tank (4). A pressure sensor (6) is fixedly installed on the top of the housing (301). A pulse controller (7) is provided on the pressure sensor (6). A blowpipe (8) is fixedly installed at the outlet of the electromagnetic pulse valve (5). Three air pipes (9) are connected to the blowpipe (8). Two jet nozzles (10) are fixedly installed on each of the three air pipes (9). Both jet nozzles (10) are located above the filter bag (303).

4. A device for full dry cleaning of converter fumes according to claim 2, characterized in that, An explosion-proof device (11) is fixedly installed on one side of the housing (301), and an alarm (12) is fixedly installed on one side of the explosion-proof device (11). An indicator light (13) is provided on the alarm (12).

5. A device for full dry cleaning of converter fumes according to claim 2, characterized in that, A hopper (14) is fixedly installed at the bottom of the housing (301), and a discharge plate (15) is inserted into the hopper (14).

6. A device for full dry cleaning of converter fumes according to claim 5, characterized in that, Hooks (16) are fixedly installed on both sides of the ash hopper (14), and the hooks (16) can be used to hang ash collection bags.

7. A device for full dry cleaning of converter fumes according to claim 2, characterized in that, A filter (17) is threaded onto the exhaust pipe (306), and two activated carbon filter screens (18) are fixedly installed inside the filter (17).

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