Efficient dust removal device for oxygen lance nozzle of steelmaking converter

Abstract

This utility model discloses a high-efficiency dust removal device for the oxygen lance nozzle of a steelmaking converter, including a furnace body, a nitrogen sealing plug, and an oxygen lance inserted inside the nitrogen sealing plug. A dust cover is installed above the furnace body, with a through hole machined at the center of the top of the dust cover. The oxygen lance is inserted into the through hole, and a ring pipe is installed on the side wall of the through hole. Several downward-sloping nozzles are evenly distributed along the circumference of the inner side of the ring pipe, with the air jet direction of the nozzles facing the oxygen lance. An ash box is installed on the outer wall of the upper part of the furnace body, and the lower end of the dust cover is connected to the ash box. A baffle cylinder is concentrically installed at the top of the dust cover, forming an annular upper air chamber between the baffle cylinder and the dust cover. A ring mesh is installed at the lower end of the upper air chamber, and an exhaust pipe is installed on the dust cover above the upper air chamber, with an exhaust fan installed on the exhaust pipe. In summary, this utility model has the advantages of energy saving and consumption reduction, safety and environmental protection, good dust removal effect, and high working efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of converter oxygen lance nozzle dust removal equipment, specifically to a high-efficiency dust removal device for steelmaking converter oxygen lance nozzles. Background Technology

[0002] Converter steelmaking uses molten iron, scrap steel, and ferroalloys as the main raw materials. Without the aid of external energy, it relies on the physical heat of the molten iron itself and the heat generated by the chemical reaction between the components of the molten iron to complete the steelmaking process in the converter. The oxygen lance is the core equipment of the steelmaking converter, responsible for injecting oxygen into the molten pool at high speed to promote the oxidation of elements such as carbon, silicon, and phosphorus in the molten steel and complete the steelmaking reaction. Its working principle involves several key processes such as oxygen jetting, molten pool stirring, chemical reaction, and heat transfer.

[0003] Currently, steel plants employ the following methods to address the escaping flue gas from the oxygen lance nozzle during converter blowing: Some plants allow the flue gas to be released into the atmosphere, causing air pollution. Furthermore, since the main component of the flue gas is carbon monoxide, direct emission also wastes carbon monoxide. Secondly, some plants use dust hoods installed on the high roof of the converter to remove the escaping flue gas. However, this method results in a large air volume for dust removal due to the significant height difference between the roof and the oxygen lance nozzle, increasing energy consumption and dust removal costs. Moreover, due to crosswinds, some flue gas still diffuses into the steelmaking workshop, easily leading to carbon monoxide accumulation and posing a significant safety hazard. Additionally, some steel plants have adopted dust removal equipment for the escaping flue gas from the oxygen lance nozzle, but this also suffers from poor dust removal efficiency. Therefore, developing an energy-saving, environmentally friendly, and highly efficient dust removal device for the oxygen lance nozzle of a steelmaking converter is objectively necessary. Utility Model Content

[0004] The purpose of this utility model is to provide an energy-saving, safe, environmentally friendly, and highly efficient dust removal device for oxygen lance nozzles in steelmaking converters.

[0005] The purpose of this utility model is achieved as follows: it includes a furnace body, a nitrogen-sealed plug, and an oxygen lance inserted into the nitrogen-sealed plug. A dust cover is provided on the top of the furnace body. A through hole is machined at the center of the top of the dust cover. The oxygen lance is inserted into the through hole. A ring pipe is provided on the side wall of the through hole. Several inclined downward spray holes are evenly distributed along the circumference of the inner side of the ring pipe, and the air jet direction of the spray holes is towards the oxygen lance. An ash box is provided on the outer wall of the upper part of the furnace body. The lower end of the dust cover is connected to the ash box. An air baffle is concentrically provided at the top of the dust cover. An annular upper air chamber is formed between the air baffle and the dust cover. A ring mesh is provided at the lower end of the upper air chamber. An exhaust pipe is provided on the dust cover above the upper air chamber. An exhaust fan is provided on the exhaust pipe.

[0006] Furthermore, the upper air chamber is filled with filter media.

[0007] Furthermore, the bottom of the ash box is inclined, and an ash discharge port is provided at the lower end of the bottom of the ash box.

[0008] Furthermore, multiple annular baffles are arranged alternately in the upper air chamber.

[0009] Furthermore, the nozzles are arranged in multiple rows in a staggered pattern.

[0010] Furthermore, the jet direction of the nozzle is tangent to the outer wall of the oxygen lance.

[0011] Furthermore, a return pipe is installed between the exhaust pipe at the exhaust end of the exhaust fan and the air inlet of the ring pipe.

[0012] This invention is used for the capture and dust removal of flue gas escaping from the oxygen lance nozzle of a steelmaking converter. During the operation of the steelmaking converter, some flue gas escapes from the nitrogen plug at the oxygen lance nozzle. The exhaust fan is started, and nitrogen, carbon monoxide, and other gases are simultaneously introduced into the annular pipe. On the one hand, under the suction of the exhaust fan, the inside of the dust cover is in a negative pressure state. This negative pressure can prevent the flue gas in the dust cover from escaping from the gap between the annular pipe and the oxygen lance. On the other hand, the nitrogen and other gas flows out from the nozzles on the annular pipe, and several streams of gas form an air curtain that blocks the flue gas from escaping. The combination of the two can effectively block the flue gas from escaping. The flue gas will first flow towards the edge of the dust cover, collide with the baffle, and separate some particulate impurities. Then the flue gas flows downward, changes direction and flows upward, and enters the upper air chamber after passing through the ring net. On the one hand, the ring net filters the particulate impurities in the flue gas, and on the other hand, the principle of gravity settling is used to remove the particulate impurities in the flue gas. The filtered flue gas is discharged from the exhaust pipe. In this invention, a dust cover is installed to collect and treat the flue gas escaping from the oxygen lance nozzle. The dust cover is located above and close to the oxygen lance nozzle, allowing a relatively low-power exhaust fan to achieve the same flue gas extraction effect as the high-power exhaust fan used in existing technologies, thus achieving energy saving and reducing consumption, and lowering the dust removal cost at the oxygen lance nozzle. Secondly, this device is specifically designed for dust removal at the converter oxygen lance nozzle, collecting and treating the flue gas escaping from the nozzle to prevent its spread and pollution of the surrounding environment and factory buildings. Furthermore, the main component of the flue gas after filtration and dust removal is carbon monoxide, which can be uniformly purified and recycled, preventing waste and accumulation of carbon monoxide in the factory buildings, thus avoiding harm to workers' health. In addition, this invention combines impact dust removal, gravity dust removal, and physical dust removal using filters to sequentially treat the flue gas, achieving efficient dust removal with good results. In summary, this utility model has the advantages of energy saving and consumption reduction, safety and environmental protection, good dust removal effect, and high work efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 A magnified structural diagram of node A in the middle; Figure 3 This is a top view of the structure of the central ring pipe 5 in this utility model; In the diagram: 1-furnace body, 2-nitrogen plug, 3-oxygen lance, 4-dust cover, 5-ring pipe, 6-nozzle, 7-ash box, 8-gas baffle, 9-ring mesh, 10-exhaust pipe, 11-exhaust fan, 12-filter packing, 13-ash discharge port, 14-annular baffle plate, 15-return pipe. 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 Figures 1-3 As shown, this utility model includes a furnace body 1, a nitrogen sealing plug 2, and an oxygen lance 3 inserted inside the nitrogen sealing plug 2. The furnace body 1, nitrogen sealing plug 2, and oxygen lance 3 are all existing technologies. The nitrogen sealing plug 2 is located at the oxygen lance inlet on the furnace body 1 to prevent flue gas from escaping. However, in actual production, some flue gas still escapes. The oxygen lance 3 is used to blow oxygen into the furnace body 1. A dust cover 4 is installed above the furnace body 1. A through hole is machined at the center of the top of the dust cover 4, and the oxygen lance 3 is inserted into the through hole. The sidewall of the through hole is equipped with... There is a ring pipe 5, and several downward-sloping nozzles 6 are evenly distributed along the circumference of the inner side of the ring pipe 5. The jet direction of the nozzles 6 is towards the oxygen lance 3. An ash box 7 is provided on the outer wall of the upper part of the furnace body 1. The lower end of the dust cover 4 is connected to the ash box 7. A baffle cylinder 8 is concentrically provided at the top inside the dust cover 4. An annular upper air chamber is formed between the baffle cylinder 8 and the dust cover 4. A ring net 9 is provided at the lower end of the upper air chamber. An exhaust pipe 10 is provided on the dust cover 4 above the upper air chamber. An exhaust fan 11 is provided on the exhaust pipe 10.

[0016] This utility model is used for the capture and dust removal of flue gas escaping from the oxygen lance nozzle of a steelmaking converter. During converter operation, some flue gas escapes from the nitrogen plug 2 at the oxygen lance nozzle. The exhaust fan 11 is started, and nitrogen, carbon monoxide, and other gases are simultaneously introduced into the annular pipe 5. On one hand, under the suction of the exhaust fan 11, the interior of the dust cover 4 is under negative pressure. This negative pressure prevents the flue gas inside the dust cover 4 from escaping through the gap between the annular pipe 5 and the oxygen lance 3. On the other hand, the nitrogen and other gas streams are ejected from the nozzles on the annular pipe 5. The dry airflow forms an air curtain that blocks the escape of flue gas. The combination of the two can effectively block the escape of flue gas. The flue gas will first flow to the edge of the dust cover 4 and collide with the air baffle 8, separating some particulate impurities. Then the flue gas flows downward, changes direction and flows upward, and enters the upper air chamber after passing through the ring net 9. On the one hand, the ring net 9 is used to filter particulate impurities in the flue gas, and on the other hand, the principle of gravity settling is used to remove particulate impurities in the flue gas. The filtered flue gas is discharged from the exhaust pipe 10.

[0017] In this invention, a dust cover 4 is provided to collect and treat the flue gas escaping from the oxygen lance nozzle. The dust cover 4 is located above and close to the oxygen lance nozzle, allowing a relatively low-power exhaust fan 11 to achieve the same flue gas suction effect as the high-power exhaust fan in the prior art, thus achieving energy saving and reducing consumption, and lowering the dust removal cost of the oxygen lance nozzle. Secondly, this device is specifically designed for dust removal at the converter oxygen lance nozzle, collecting and treating the flue gas escaping from the nozzle, preventing the spread of flue gas, and thus preventing flue gas from polluting the surrounding environment and the plant. At the same time, the main component of the flue gas after filtration and dust removal is carbon monoxide, which can be uniformly purified and recycled, preventing the waste of carbon monoxide and preventing carbon monoxide from accumulating in the plant, avoiding the harm of carbon monoxide to the health of workers. In addition, this invention adopts a combination of collision dust removal, gravity dust removal, and physical dust removal by filter screens to sequentially treat the flue gas for dust removal, which can efficiently complete the dust removal work and has a good dust removal effect.

[0018] The upper air chamber is filled with filter media 12, which is an existing gas filter material that is resistant to high temperature and has stable performance, further adsorbing and removing fine particles in the flue gas.

[0019] The bottom of the ash box 7 is inclined, and a ash discharge port 13 is provided at the lower end of the bottom of the ash box 7. In this utility model, the particulate impurities separated from the flue gas continuously fall and accumulate in the ash box 7, and can be discharged periodically. In order to facilitate the discharge of dust in the ash box 7, the bottom of the ash box 7 is set in an inclined state, and the dust is discharged from the ash discharge port 13 at the lower end of the ash box 7, which can easily and cleanly discharge the dust.

[0020] Multiple annular baffles 14 are arranged alternately in the upper air chamber. During use, the flue gas flows upward into the upper air chamber after being filtered by the ring mesh 9. At this time, the annular baffles 14 have the function of blocking the airflow from flowing directly upward, causing the airflow to flow in a curved manner in the upper air chamber and forming turbulence, which further improves the dust removal effect of the flue gas.

[0021] The nozzles 6 are arranged in multiple staggered rows, which can spray out multiple layers of airflow to form a multi-layered sealed air curtain from bottom to top, further preventing the escape of flue gas. Compared with a structure with only one layer of air curtain, it can better prevent flue gas from breaking through the air curtain and escaping, and has a better sealing effect.

[0022] The jet direction of the nozzle 6 is tangent to the outer wall of the oxygen lance 3. The gas flow direction of the nozzle 6 is tangent to the outer wall of the oxygen lance 3. The combined action of multiple gases causes the flue gas inside the dust cover 4 to form a vortex, thereby using the principle of spiral dust removal to remove particulate impurities from the flue gas and improve the dust removal efficiency and effect.

[0023] A return pipe 15 is provided between the exhaust pipe 10 at the outlet of the exhaust fan 11 and the air inlet of the ring pipe 5. The exhaust fan 11 draws out the filtered and dust-removed flue gas, and returns a portion of it to the ring pipe 5, where it is ejected from the nozzle 6 to prevent the flue gas inside the dust cover 4 from escaping. This not only prevents the flue gas from escaping, but also saves on the amount of nitrogen and other gases used, reducing the cost of collecting and removing the escaping flue gas.

Claims

1. A high-efficiency dust removal device for oxygen lance nozzles in steelmaking converters, comprising a furnace body (1), a nitrogen sealing plug (2), and an oxygen lance (3) inserted within the nitrogen sealing plug (2), characterized in that: A dust cover (4) is provided above the furnace body (1). A through hole is machined at the center of the top of the dust cover (4). The oxygen lance (3) is inserted into the through hole. A ring pipe (5) is provided on the side wall of the through hole. Several downward-sloping nozzles (6) are evenly distributed along the circumference of the inner side of the ring pipe (5). The jet direction of the nozzles (6) is towards the oxygen lance (3). An ash box (7) is provided on the outer wall of the upper part of the furnace body (1). The lower end of the dust cover (4) is connected to the ash box (7). A baffle cylinder (8) is concentrically provided at the top of the dust cover (4). An annular upper air chamber is formed between the baffle cylinder (8) and the dust cover (4). A ring net (9) is provided at the lower end of the upper air chamber. An exhaust pipe (10) is provided on the dust cover (4) above the upper air chamber. An exhaust fan (11) is provided on the exhaust pipe (10).

2. The high-efficiency dust removal device for oxygen lance nozzles in steelmaking converters according to claim 1, characterized in that: The upper air chamber is filled with filter material (12).

3. The high-efficiency dust removal device for oxygen lance nozzles in steelmaking converters according to claim 1, characterized in that: The bottom of the ash box (7) is inclined, and the lower end of the bottom of the ash box (7) is provided with an ash discharge port (13).

4. The high-efficiency dust removal device for oxygen lance nozzles in steelmaking converters according to claim 1, characterized in that: The upper air chamber is provided with multiple annular baffles (14) arranged alternately at intervals.

5. The high-efficiency dust removal device for oxygen lance nozzles in steelmaking converters according to claim 1, characterized in that: The nozzles (6) are arranged in multiple staggered rows.

6. The high-efficiency dust removal device for oxygen lance nozzles in steelmaking converters according to claim 1, characterized in that: The jet direction of the nozzle (6) is tangent to the outer wall of the oxygen lance (3).

7. The high-efficiency dust removal device for oxygen lance nozzles in steelmaking converters according to claim 1, characterized in that: A return pipe (15) is provided between the exhaust pipe (10) at the exhaust end of the blower (11) and the air inlet of the ring pipe (5).

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