Oxygen-enriched side-blown furnace dust removal device

Abstract

The utility model relates to metallurgical smelting flue gas dust removal technical field, including the flue gas pretreatment mechanism, multistage dust removal mechanism and the air draft smoke exhaust mechanism of intercommunication in proper order, flue gas pretreatment mechanism gas inlet end with oxygen enrichment side blowing furnace smoke dust export intercommunication, flue gas pretreatment mechanism gas outlet end is connected with multistage dust removal mechanism gas inlet end, and the air draft smoke exhaust mechanism is installed in multistage dust removal mechanism gas outlet end, the utility model discloses a flue gas pretreatment mechanism, multistage dust removal mechanism, air draft smoke exhaust mechanism three -level series connection type structure, first through spray cooling, current rectification, primary settlement complete high -temperature flue gas pretreatment, reduce flue gas temperature, equalize airflow, intercept big particle dust, then utilize bag filter dust removal subassembly fine filtration fine smoke dust, and the dust continuous collection is realized to grading automatic unloading, greatly promote dust removal stability, filter precision, prolong the service life of filter bag, and the uninterrupted smelting condition of adaptation oxygen enrichment side blowing furnace.

Description

Technical Field

[0001] This utility model relates to the field of dust removal technology for metallurgical smelting flue gas, and in particular to a dust removal device for an oxygen-enriched side-blown furnace. Background Technology

[0002] Oxygen-enriched side-blown furnaces are core smelting equipment for non-ferrous metal smelting. During the smelting process, they continuously generate high-temperature, high-dust-concentration smelting flue gas. The flue gas contains metal oxide particles and high-temperature molten dust. Direct discharge will cause serious air pollution. At the same time, the high-temperature flue gas can easily damage conventional dust collector filter bags, and coarse dust particles can easily clog the dust collection structure, significantly shortening the service life of the dust collection equipment.

[0003] Existing traditional dust removal equipment lacks pre-cooling and flow equalization pretreatment structures, allowing high-temperature flue gas to directly enter the bag filter housing. High-temperature burning can easily damage the filter bags. The flue gas flow is turbulent and the flow velocity is uneven, resulting in excessive dust accumulation on some filter bags and uneven dust load distribution. Coarse dust does not settle in advance and accumulates on the surface of the filter bags, leading to high cleaning frequency, low dust removal efficiency, and cumbersome manual operation for ash unloading. It cannot meet the production requirements of continuous, stable, and long-cycle dust removal for oxygen-enriched side-blown furnaces.

[0004] Therefore, it is essential to provide an oxygen-enriched side-blown furnace dust removal device to address the shortcomings of existing technologies. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a dust removal device for an oxygen-enriched side-blown furnace. This invention adopts a three-stage series structure consisting of a flue gas pretreatment mechanism, a multi-stage dust removal mechanism, and an induced draft exhaust mechanism. First, high-temperature flue gas pretreatment is completed through spray cooling, flow equalization and rectification, and primary settling to reduce flue gas temperature, balance airflow, and trap large dust particles. Then, a bag filter assembly is used to finely filter fine dust, and an automatic dust removal assembly is used to clean the dust. Finally, a variable frequency induced draft fan stably guides the clean flue gas to meet emission standards, and automatic ash removal in stages achieves continuous dust collection, significantly improving dust removal stability and filtration accuracy, extending the service life of filter bags, and adapting to the uninterrupted smelting conditions of an oxygen-enriched side-blown furnace.

[0006] The above-mentioned objectives of this utility model are achieved through the following technical means.

[0007] A dust removal device for an oxygen-enriched side-blown furnace is provided, comprising a flue gas pretreatment mechanism, a multi-stage dust removal mechanism, and an induced draft exhaust mechanism connected in sequence. The inlet end of the flue gas pretreatment mechanism is connected to the dust outlet of the oxygen-enriched side-blown furnace, the outlet end of the flue gas pretreatment mechanism is connected to the inlet end of the multi-stage dust removal mechanism, and the induced draft exhaust mechanism is installed at the outlet end of the multi-stage dust removal mechanism. The flue gas pretreatment mechanism includes a cooling and equalizing cylinder, a flue gas inlet at the bottom of the cooling and equalizing cylinder, a flue gas outlet at the top of the cooling and equalizing cylinder, a spray cooling component installed inside the cooling and equalizing cylinder, an equalizing and rectifying plate installed in the middle of the cooling and equalizing cylinder, the equalizing and rectifying plate being fixed at an inclination on the inner wall of the cooling and equalizing cylinder, a primary settling ash hopper connected to the bottom of the cooling and equalizing cylinder, and a first automatic ash discharge valve installed at the bottom of the primary settling ash hopper. The multi-stage dust removal mechanism includes a housing shell, an inner wall of which is provided with a flue gas transition inlet, which is connected to a flue gas outlet located at the top of the cooling and equalizing cylinder, a bag filter assembly installed inside the housing shell, a soot blowing assembly installed above the bag filter assembly, a top of the housing shell connected to an exhaust fan, and a conical ash collection bin installed at the bottom of the housing shell, with a second automatic ash discharge valve installed at the bottom of the conical ash collection bin.

[0008] Specifically, the spray cooling component includes an annular spray water tank, which is installed inside the cooling flow equalization cylinder. The annular spray water tank is connected to a water storage tank through its pipeline, and spray nozzles are evenly installed at the bottom of the annular spray water tank.

[0009] Specifically, the bag filter assembly includes a filter bag mounting plate, which is horizontally installed inside the housing, and dust collection filter bags are evenly installed on the filter bag mounting plate.

[0010] Specifically, the dust blowing assembly includes a blowpipe, which is horizontally installed above the filter bag mounting plate. Blow nozzles are evenly installed at the bottom of the blowpipe, and the blowpipe is connected to an external air source. Each set of blow nozzles corresponds to the top of the dust collector filter bag.

[0011] Specifically, the exhaust system includes an exhaust duct, a variable frequency exhaust fan, and a compliant discharge port. The variable frequency exhaust fan is installed in the middle section of the exhaust duct, which is connected to the outer shell of the housing. The compliant discharge port is installed directly below the variable frequency exhaust fan.

[0012] Specifically, the tilt angle of the current equalization rectifier plate is 15°-30°, and the surface of the current equalization rectifier plate is uniformly opened with flow guiding micro-holes with a diameter of 8-12mm.

[0013] Specifically, the spray nozzle is a solid cone-shaped atomizing nozzle with an atomization particle size of 50-100μm, and the spray coverage completely covers the air inlet section of the cooling and equalizing cylinder.

[0014] This utility model adopts a three-stage series structure consisting of a flue gas pretreatment mechanism, a multi-stage dust removal mechanism, and an induced draft exhaust mechanism. First, high-temperature flue gas pretreatment is completed through spray cooling, flow equalization and rectification, and primary settling to reduce flue gas temperature, equalize airflow, and trap large dust particles. Then, a bag filter dust collector is used to finely filter fine dust, and an automatic dust removal component is used to clean the dust. Finally, a variable frequency induced draft fan stably guides the clean flue gas to meet emission standards, and automatic ash removal in stages achieves continuous dust collection, greatly improving dust removal stability, filtration accuracy, and extending the service life of filter bags. It is suitable for uninterrupted smelting conditions in oxygen-enriched side-blown furnaces. Attached Figure Description

[0015] The present invention will be further described with reference to the accompanying drawings, but the content of the drawings does not constitute any limitation on the present invention.

[0016] Figure 1 This is a schematic diagram of the flue gas pretreatment mechanism in an oxygen-enriched side-blown furnace dust removal device according to this utility model.

[0017] Figure 2 This is a schematic diagram of the multi-stage dust removal mechanism in an oxygen-enriched side-blown furnace dust removal device according to this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of a part of the bag filter assembly and a part of the soot blowing assembly in an oxygen-enriched side-blown furnace dust removal device of this utility model.

[0019] Figure 4 This is a schematic diagram of the spray cooling component in an oxygen-enriched side-blown furnace dust removal device according to this utility model.

[0020] from Figures 1 to 4 Including: 1. Flue gas pretreatment mechanism; 2. Multi-stage dust removal mechanism; 3. Exhaust fan mechanism; 4. Standard emission outlet; 5. Cooling and flow equalization cylinder; 6. Flue gas inlet; 7. Flue gas outlet; 8. Spray cooling component; 9. Flow equalization and rectifier plate; 10. Primary settling hopper; 11. First automatic ash discharge valve; 12. Housing shell; 13. Flue gas transition inlet; 14. Bag filter assembly; 15. Soot blowing assembly; 16. Conical ash collection bin; 17. Second automatic ash discharge valve; 18. Annular spray water tank; 19. Water storage tank; 20. Spray nozzle; 21. Filter bag mounting plate; 22. Dust collector filter bag; 23. Pulse jet pipe; 24. Pulse jet nozzle; 25. External air source; 26. Exhaust duct; 27. Variable frequency induced draft fan. Detailed Implementation

[0021] The present invention will be further described in conjunction with the following embodiments.

[0022] Example 1.

[0023] like Figure 1-4As shown, a dust removal device for an oxygen-enriched side-blown furnace includes a flue gas pretreatment mechanism 1, a multi-stage dust removal mechanism 2, and an induced draft exhaust mechanism 3 connected in sequence. The inlet end of the flue gas pretreatment mechanism 1 is connected to the dust outlet of the oxygen-enriched side-blown furnace, and the outlet end of the flue gas pretreatment mechanism 1 is connected to the inlet end of the multi-stage dust removal mechanism 2. The induced draft exhaust mechanism 3 is fixedly installed at the outlet end of the multi-stage dust removal mechanism 2. The three are connected in series to form a complete flue gas dust removal treatment channel, realizing integrated operation of smelting flue gas pretreatment, fine dust removal, and stable exhaust.

[0024] The flue gas pretreatment mechanism 1 includes a cooling and equalizing cylinder 5. A flue gas inlet 6 is opened at the bottom of the cooling and equalizing cylinder 5. High-temperature smelting flue gas enters the cylinder from the flue gas inlet 6. A flue gas outlet 7 is opened at the top of the cylinder. After cooling, equalizing and coarse dust separation, the flue gas is transported to the multi-stage dust removal mechanism 2 from the flue gas outlet 7.

[0025] The inner cavity of the cooling and flow equalization cylinder 5 is equipped with a spray cooling component 8. A flow equalization and rectifier plate 9 is fixedly installed at an angle in the middle of the cylinder. The angle of the flow equalization and rectifier plate 9 is set to 15°-30°, and the plate surface is evenly distributed with 8-12mm flow guiding micro-holes. The inclined structure can block large particles of smoke and dust in the flue gas from directly impacting upwards. The micro-holes divide the turbulent airflow, so that the flue gas velocity in all parts of the cylinder is uniform and consistent, avoiding the imbalance of dust removal load caused by excessive local airflow velocity. At the same time, the intercepted coarse smoke and dust slide down the inclined plate surface to the bottom of the cylinder.

[0026] The lower end of the cooling and equalizing cylinder 5 is integrally connected to the primary settling ash hopper 10. The bottom of the ash hopper is equipped with the first automatic ash discharge valve 11. Large particles of metal dust and molten slag particles settle into the primary settling ash hopper 10 under their own weight and the action of spray water mist. The first automatic ash discharge valve 11 can automatically open at timed intervals to discharge ash without the need for manual opening of the cover for cleaning, realizing continuous automatic collection of coarse dust and reducing manual intervention.

[0027] The spray cooling component 8 consists of an annular spray water tank 18, which is fixed to the upper inner wall of the cooling and equalizing cylinder 5. The annular spray water tank 18 is connected to a water storage tank 19 through a water supply pipe. Spray nozzles 20 are evenly distributed on the lower surface of the annular spray water tank 18. The spray nozzles 20 are solid conical atomizing nozzles with atomized particle size controlled at 50-100μm. The atomized water mist can completely cover the entire air inlet section of the cooling and equalizing cylinder 5.

[0028] The water storage tank 19 continuously supplies cooling water to the annular spray water tank 18. The cooling water is atomized by the spray nozzle 20 and diffuses downwards, making full counter-current contact with the high-temperature flue gas rising from the bottom. This rapidly absorbs the heat of the flue gas, significantly reducing its temperature and preventing it from directly entering the rear bag filter mechanism and burning the dust collection filter bags. At the same time, the fine water mist encapsulates the coarse dust particles in the flue gas, increasing the weight of the dust, accelerating the settling of coarse particles, and improving the dust interception effect of the primary settling hopper 10.

[0029] The multi-stage dust removal mechanism 2 is equipped with a housing shell 12. A flue gas transition inlet 13 is opened on the side wall of the housing shell 12. The flue gas transition inlet 13 is sealed and connected to the flue gas outlet 7 at the top of the cooling and equalizing cylinder 5. The pre-treated low-temperature and uniform flue gas is smoothly introduced into the interior of the housing shell 12.

[0030] The inner cavity of the housing 12 is horizontally fixed with a bag filter assembly 14. The bag filter assembly 14 includes a filter bag mounting plate 21. The filter bag mounting plate 21 horizontally divides the internal space of the housing. Multiple sets of dust collector filter bags 22 are evenly suspended on the surface of the filter bag mounting plate 21. When the flue gas passes through the filter bag, the fine dust is intercepted and attached by the filter bag, and the clean gas passes upward through the filter bag, realizing high-precision filtration of fine dust.

[0031] A dust blowing assembly 15 is installed above the bag filter assembly 14. The dust blowing assembly 15 includes horizontally arranged blow pipes 23. A blow nozzle 24 is installed at the bottom of the blow pipe 23 corresponding to the top of each dust filter bag 22. The blow pipe 23 is connected to an external air source 25. When too much dust accumulates on the surface of the dust filter bag 22 and the ventilation resistance increases, the external air source 25 delivers high-pressure airflow to the blow pipe 23. The high-pressure airflow is sprayed downwards instantaneously through the blow nozzle 24, impacting the dust filter bag 22 and causing it to shake off the fine dust adhering to the surface of the filter bag. This achieves automated online dust removal without stopping or disassembling the equipment, ensuring the continuous and stable operation of the dust collection device.

[0032] The bottom of the outer shell 12 is equipped with a conical dust collection bin 16. The fine dust that is shaken off is collected along the bin wall to the bottom of the bin. The bottom of the conical dust collection bin 16 is equipped with a second automatic dust discharge valve 17, which can automatically discharge the collected fine dust at regular intervals. Coarse and fine dust are collected separately, which facilitates the subsequent recycling of metal dust.

[0033] The exhaust system 3 includes an exhaust duct 26, a variable frequency exhaust fan 27, and a compliant discharge port 4. The variable frequency exhaust fan 27 is installed in the middle of the exhaust duct 26. The lower end of the exhaust duct 26 is sealed and connected to the air outlet at the top of the housing 12. The compliant discharge port 4 is located in the downstream pipe of the variable frequency exhaust fan 27.

[0034] The variable frequency induced draft fan 27 provides stable negative pressure suction for the entire unit. The fan speed can be adjusted according to the smelting conditions of the oxygen-enriched side-blown furnace to match the real-time flue gas generation, ensuring stable flue gas flow throughout the process and preventing flue gas accumulation and dust settling that block the channel inside the cylinder. The clean flue gas after fine filtration by the bag filter flows through the exhaust pipe 26 under the negative pressure of the fan and is finally discharged from the emission port 4. The dust concentration of the flue gas meets the environmental emission standards.

[0035] When using this device, seal the dust outlet of the oxygen-enriched side-blown furnace with the flue gas inlet 6, start the entire dust removal system, and simultaneously start the water storage tank supply, external air source supply, variable frequency induced draft fan 27, first automatic ash discharge valve 11 and second automatic ash discharge valve 17 timed ash discharge program.

[0036] Flue gas pretreatment stage: High-temperature, high-dust flue gas generated by oxygen-enriched side-blown furnace smelting enters the cooling and equalization cylinder 5 from the flue gas inlet 6. Cooling water in the water storage tank 19 is sent to the annular spray water tank 18, and atomized into a fine water mist by the solid conical spray nozzles 20. The water mist exchanges heat with the upward high-temperature flue gas in the opposite direction, quickly reducing the flue gas temperature and preventing high temperature damage to the downstream filter bags. At the same time, the water mist encapsulates large dust particles in the flue gas, increasing the weight of the dust. Under the action of gravity, the dust settles downward to the primary settling ash hopper 10. During the upward flow of the flue gas, it passes through the equalization and rectification plate 9 tilted at 15°-30°. The 8-12mm guide micro-holes disperse the turbulent vortex and equalize the flue gas velocity in all parts of the cylinder. A small amount of coarse particles that do not settle are intercepted and slide off by the rectification plate, completing the three-stage pretreatment of coarse dust separation, cooling, and airflow equalization. After the coarse dust accumulates to the set amount, the first automatic ash discharge valve 11 automatically opens to discharge ash.

[0037] Multi-stage baghouse fine dust collection stage: The pre-treated low-temperature uniform flow flue gas enters the housing shell 12 through flue gas outlet 7 and flue gas transition inlet 13. The flue gas rises through the dust collection filter bags 22 on the filter bag mounting plate 21. Micron-sized fine dust in the flue gas is blocked and adsorbed by the filter bags, and clean gas flows upward. When the dust collection filter bags 22 accumulate too much dust and the ventilation resistance exceeds the standard, the external air source 25 delivers high-pressure air to the blow pipe 23. The blow nozzle 24 is aimed at the filter bags and blows, shaking the filter bags to make the surface dust fall off. The dust falls into the cone-shaped dust collection bin 16 below. After accumulating to the set capacity, the second automatic dust discharge valve 17 automatically discharges the material, completing the fine dust recovery.

[0038] During the induced draft emission stage: the variable frequency induced draft fan 27 continuously provides a stable negative pressure, guiding the clean flue gas in the box into the exhaust pipe 26. The variable frequency mode can adapt to the changes in flue gas volume at different stages of smelting, ensuring the stability of the negative pressure of the entire unit and preventing flue gas from overflowing; finally, the clean flue gas is discharged in compliance with regulations through the emission port 4.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A dust removal device for an oxygen-enriched side-blown furnace, characterized in that: It includes a flue gas pretreatment mechanism, a multi-stage dust removal mechanism, and an induced draft exhaust mechanism connected in sequence. The inlet end of the flue gas pretreatment mechanism is connected to the dust outlet of the oxygen-enriched side-blown furnace, the outlet end of the flue gas pretreatment mechanism is connected to the inlet end of the multi-stage dust removal mechanism, and the induced draft exhaust mechanism is installed at the outlet end of the multi-stage dust removal mechanism. The flue gas pretreatment mechanism includes a cooling and equalizing cylinder, a flue gas inlet at the bottom of the cooling and equalizing cylinder, a flue gas outlet at the top of the cooling and equalizing cylinder, a spray cooling component installed inside the cooling and equalizing cylinder, a flow equalizing and rectifying plate installed in the middle of the cooling and equalizing cylinder, the flow equalizing and rectifying plate being fixed obliquely to the inner wall of the cooling and equalizing cylinder, and a primary settling ash hopper connected to the bottom of the cooling and equalizing cylinder, with a first automatic ash discharge valve installed at the bottom of the primary settling ash hopper; The multi-stage dust removal mechanism includes a housing shell, with a flue gas transition inlet on the inner wall of the housing shell. The flue gas transition inlet is connected to the flue gas outlet located at the top of the cooling and equalizing cylinder. A bag filter assembly is installed inside the housing shell, and a soot blowing assembly is installed above the bag filter assembly. The top of the housing shell is connected to the induced draft and exhaust mechanism. A conical ash collection bin is installed at the bottom of the housing shell, and a second automatic ash discharge valve is installed at the bottom of the conical ash collection bin.

2. The dust removal device for an oxygen-enriched side-blown furnace according to claim 1, characterized in that: The spray cooling component includes an annular spray water tank, which is installed inside the cooling flow equalization cylinder. The annular spray water tank is connected to a water storage tank via a pipeline, and spray nozzles are evenly installed at the bottom of the annular spray water tank.

3. The dust removal device for an oxygen-enriched side-blown furnace according to claim 2, characterized in that: The bag filter assembly includes a filter bag mounting plate, which is horizontally installed inside the housing, and dust collection filter bags are evenly installed on the filter bag mounting plate.

4. The dust removal device for an oxygen-enriched side-blown furnace according to claim 3, characterized in that: The dust blowing assembly includes a blowpipe, which is horizontally installed above the filter bag mounting plate. Blow nozzles are evenly installed at the bottom of the blowpipe. The blowpipe is connected to an external air source. Each set of blow nozzles corresponds to the top of the dust collector filter bag.

5. The dust removal device for an oxygen-enriched side-blown furnace according to claim 4, characterized in that: The exhaust system includes an exhaust duct, a variable frequency exhaust fan, and a compliant discharge port. The variable frequency exhaust fan is installed in the middle section of the exhaust duct, which is connected to the outer shell of the housing. The compliant discharge port is installed directly below the variable frequency exhaust fan.

6. The dust removal device for an oxygen-enriched side-blown furnace according to claim 5, characterized in that: The tilt angle of the flow equalization rectifier plate is 15°-30°, and the surface of the flow equalization rectifier plate is uniformly opened with flow guiding micro-holes with a diameter of 8-12mm.

7. The dust removal device for an oxygen-enriched side-blown furnace according to claim 6, characterized in that: The spray nozzle is a solid cone-shaped atomizing nozzle with an atomization particle size of 50-100μm, and the spray coverage area completely covers the air inlet section of the cooling and equalizing cylinder.

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