Converter oxygen lance opening dust removal device

Abstract

The utility model discloses a converter oxygen lance mouth dust removal device, which comprises a dust removal main body piece, an electric valve and a control system, the dust removal main body piece comprises an upper flange, a lower flange, a plurality of pipeline joints and a plurality of air draft ducts, and the pipeline joints are welded with the upper flange and the lower flange and are positioned between the upper flange and the lower flange; the upper flange and the lower flange are coaxial, the air draft ducts are connected with the pipeline connectors in a one-to-one correspondence mode, each air draft duct is in a horn shape formed by a throat opening and an expansion section, the expansion sections of the air draft ducts are in lap joint to form a circular channel allowing an oxygen lance to be inserted therein, and the circular channel is communicated with a center hole of the upper flange and a center hole of the lower flange. Throats of the air draft ducts are connected with the corresponding pipeline joints, each pipeline joint is connected with one dust removal air pipe, the dust removal air pipes are gathered into a main pipe, the electric valve is arranged on the main pipe, and the control system is used for controlling the electric valve.

Description

Technical Field

[0001] The utility model relates to the field of industrial ventilation and dust removal, and particularly relates to a dust removal device for a converter oxygen lance nozzle. Background Art

[0002] During the converter steelmaking process, a violent carbon-oxygen reaction occurs, and the generated high-temperature flue gas or metal splash will spread around. The oxygen lance nozzle is located directly above the converter and is an important dust overflow point and metal splash point. At present, for the flue gas overflowing from the oxygen lance nozzle during the converter blowing process, if the flue gas is directly discharged into the atmosphere, it will cause serious pollution. Steel mills usually adopt the method of installing a dust removal hood on the roof inside the high bay of the converter to remove the overflowing flue gas and prevent the dust-containing flue gas from overflowing the plant and polluting the environment. Due to the large height difference between the high bay roof and the oxygen lance nozzle, not only is the construction difficulty large and the cost high, but also the ventilation in the workshop is poor, and a large amount of dispersed flue gas still enters the steelmaking high bay. CO is likely to accumulate in the high bay, posing a safety hazard, and the accumulated dust will have a serious impact on the surrounding environment and equipment operation.

[0003] Some steel mills have tried to install dust removal facilities at the oxygen lance nozzle, mainly dust removal hoods. Although they can collect the overflowing flue gas, the equipment body occupies a large space, or affects the lowering of the converter lance, or affects the slag scraping of the oxygen lance and the cleaning and maintenance around it, and the practicability is poor.

[0004] At present, with the increasingly strict environmental protection requirements in the steel industry, each enterprise attaches great importance to flue gas treatment and emission. The converter uses large-flow blowing, which will inevitably generate a large amount of high-temperature flue gas and dust. These pollutants dispersed in the plant will have a serious impact on the surrounding environment and personnel health. Therefore, it is necessary to develop a new type of dust removal device for the oxygen lance nozzle to solve these problems. Summary of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a dust removal device for a converter oxygen lance nozzle to effectively solve the problems of environmental pollution and impact on workers' health caused by dust during the existing converter smelting process.

[0006] To achieve the above purpose, the utility model is realized through the following technical solutions:

[0007] A converter oxygen lance nozzle dust removal device, comprising a dust removal main body, an electric valve, and a control system. The dust removal main body includes an upper flange, a lower flange, a plurality of pipe joints, and a plurality of air extraction ducts. The pipe joints are welded to the upper flange and the lower flange and are located between the upper flange and the lower flange. The upper flange and the lower flange are coaxial. The air extraction ducts are connected to the pipe joints one by one. The air extraction ducts are in a horn shape composed of a throat and a diffuser section. The diffuser sections of the air extraction ducts overlap to form a circular channel into which the oxygen supply lance is inserted. The circular channel is communicated with the central holes of the upper flange and the lower flange. The throat of each air extraction duct is connected to the corresponding pipe joint. Each pipe joint is connected to a dust removal air duct, and the dust removal air ducts are aggregated into a main pipe. The electric valve is arranged on the main pipe, and the control system is used to control the electric valve.

[0008] Further, the number of air extraction ducts is set to four and is evenly distributed around the circular channel.

[0009] Further, a grille is arranged on the side of the air extraction duct close to the circular channel inside.

[0010] Further, the outside of the air extraction duct is filled with heat insulation material.

[0011] Further, the dust removal air duct is wrapped with heat insulation material.

[0012] The utility model has the following beneficial effects:

[0013] 1. The oxygen lance nozzle dust removal system has a simple structure, reasonable layout, less equipment occupation space, and does not affect the operation of surrounding equipment;

[0014] 2. Adopting a flange structure, bolt connections are used between the nitrogen sealing device and the flue, which is convenient for maintenance and repair;

[0015] 3. It is located between the oxygen lance nitrogen sealing device and the oxygen lance nozzle of the flue and below the nitrogen sealing device, and is in contact with the flue gas first, which can greatly reduce the nitrogen sealing pressure and prevent gas leakage;

[0016] 4. The end of the air extraction port adopts a grille to avoid the suction of large-size sundries and ensure the stable operation of the equipment;

[0017] 5. The air extraction duct has a certain expansion angle, and 4 air extraction ducts are evenly distributed, which can significantly improve the dust removal effect;

[0018] 6. The dust removal device is interlocked with the converter and the oxygen lance, with simple operation, and can be adjusted according to the actual blowing working conditions of the converter to achieve the dust removal effect of the converter oxygen lance nozzle. Description of the Drawings

[0019] Figure 1 It is an installation schematic diagram of the dust removal main body of the utility model.

[0020] Figure 2 It is a side view schematic diagram of the dust removal main body part of the present utility model.

[0021] Figure 3 It is a plan view schematic diagram of the dust removal main body part of the present utility model.

[0022] Figure 4 It is a working schematic diagram of the converter oxygen lance nozzle dust removal device of the present utility model.

[0023] In the figure, 10 is the oxygen lance; 20 is the nitrogen sealing device; 30 is the dust removal main body part; 40 is the oxygen lance nozzle; 50 is the electric valve; 60 is the control system; 70 is the dust removal system. 31 is the upper flange; 32 is the air extraction duct; 33 is the grille; 34 is the lower flange; 35 is the heat preservation material; 36 is the pipe joint. Specific embodiments

[0024] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0026] As Figures 1 to 4 shown, this embodiment discloses a converter oxygen lance nozzle dust removal device, which includes a dust removal main body part 30, an electric valve 50, and a control system 60. The dust removal main body part includes an upper flange 31, a lower flange 34, a plurality of pipe joints 34, and a plurality of air extraction ducts 32. The pipe joints 34 are welded to the upper flange 31 and the lower flange 34 and are located between the upper flange 31 and the lower flange 34. The upper flange 31 and the lower flange are coaxial. The air extraction ducts 32 are connected to the pipe joints 34 one by one. The air extraction ducts 32 are composed of a throat and a diffuser section to form a horn shape. The diffuser sections of the air extraction ducts 32 enclose a circular channel into which the oxygen lance can be inserted. The circular channel is connected to the central hole of the upper flange 31 and the central hole of the lower flange 34. The throat of each air extraction duct 32 is connected to the corresponding pipe joint 34. Each pipe joint 34 is connected to a dust removal air duct, and the dust removal air ducts are aggregated into a main pipe. The electric valve 50 is arranged on the main pipe, and the control system 60 is used to control the electric valve 50.

[0027] The main body structure of the dust removal main body part 30 is a steel structure welded part. During installation, the lower flange 34 is connected to the oxygen lance nozzle 40, and the upper flange 31 is connected to the oxygen lance nitrogen seal device 20. The equipment is convenient for disassembly and assembly, and is easy to overhaul and maintain. The size of the annular inner cavity (i.e., the circular channel) of the dust removal main body part 30 needs to be designed to be larger than the inner cavity diameter of the nitrogen seal device 20 to prevent the upper slag residue from entering the dust removal main body part through the nitrogen seal device 20 when the oxygen lance 10 scrapes the slag, or to prevent the interference between the oxygen lance 10 running with adhered slag and the dust removal main body part, so as to ensure the normal operation of the equipment.

[0028] The extraction air duct 32 adopts a trumpet-shaped structure of a throat + expansion section, which can ensure the 360° all-round absorption of the smoke and dust inside the oxygen lance nozzle during operation, improving the dust removal effect.

[0029] A grille net 33 is provided inside the extraction air duct 32 near the oxygen lance 10 side, which can effectively prevent large-sized sundries from being sucked into the pipeline or the dust removal main body part 30, ensuring the stable operation of the equipment.

[0030] After the installation of the dust removal main body part 30 is completed, the pipeline joint 36 is connected to the external dust removal air duct (not labeled in the figure). The air ducts connected to the 4 pipeline joints 36 are finally aggregated into a main pipe. An electric valve 50 is provided on the main pipe and is centrally controlled through the control system 60, and the simultaneous opening and closing of the extraction air duct 32 can be realized.

[0031] In this embodiment, the number of extraction air ducts 32 is set to four, which are evenly distributed around the circular channel and are evenly distributed at a 90° angle around the oxygen lance nozzle 40. Correspondingly, the number of pipeline joints 34 is also set to four. In other embodiments, the number of extraction air ducts 32 and pipeline joints 34 can be increased or decreased.

[0032] The inside of the dust removal main body part 30 is provided with a heat insulation layer, and heat insulation materials 35 are filled in the area outside the extraction air duct 32, which can not only effectively prevent the equipment from being damaged by high-temperature flue gas, but also prevent the high-temperature from diffusing externally during the converter blowing process, achieving the effect of reducing the surrounding environmental temperature and improving the safety of personnel and equipment.

[0033] Furthermore, the dust removal air duct connected to the dust removal main body part 30 needs to be heat-insulated to prevent high temperature from causing harm to people or equipment and improve safety.

[0034] When the converter starts blowing, under the interlock control condition of the control system 60, the external dust removal system 70 is started. At this time, the electric valve 50 is interlocked and opened. Under the negative pressure extraction of the dust removal system 70, the smoke and dust generated during the converter blowing can be quickly transported through the pipeline to the dust removal system 70 outside the plant for discharge. When the converter blowing ends, the electric valve 50 is interlocked and closed, and the dust removal system 70 stops working.

[0035] The usage method of the converter oxygen lance nozzle dust removal device is as follows:

[0036] When the converter starts blowing, under the interlock control condition of the control system 60, the external dust removal system 70 is started. At this time, the electric valve 50 is interlocked and opened. Under the negative pressure suction of the dust removal system 70, the dust generated by the converter blowing can be quickly transported through the pipeline to the dust removal system 70 outside the plant for emission. When the converter blowing ends, the electric valve 50 is interlocked and closed, and the dust removal system 70 stops working.

[0037] As mentioned above, the embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Claims

1. A converter oxygen lance dust removal device, characterized in that, It includes a dust removal main body, an electric valve, and a control system. The dust removal main body includes an upper flange, a lower flange, multiple pipe joints and multiple exhaust ducts. The pipe joints are welded to the upper flange and the lower flange and are located between the upper flange and the lower flange. The upper flange and the lower flange are coaxial. The exhaust ducts are connected to the pipe joints one by one. The exhaust ducts are trumpet-shaped and consist of a throat and an expansion section. The expansion section of each exhaust duct forms a circular channel for inserting an oxygen gun. The circular channel is connected to the center hole of the upper flange and the center hole of the lower flange. The throat of each exhaust duct is connected to the corresponding pipe joint. Each pipe joint is connected to a dust removal duct. The dust removal ducts are combined into a main pipe. The electric valve is provided on the main pipe. The control system is used to control the electric valve.

2. The converter oxygen lance nozzle dust removal device according to claim 1, wherein The number of the exhaust ducts is set to four, which are evenly distributed around the through hole.

3. The converter oxygen lance nozzle dust removal device according to claim 1, characterized in that, A grille is provided inside the exhaust duct near one side of the through hole.

4. The converter oxygen lance nozzle dust removal device according to claim 1, characterized in that, The outside of the exhaust duct is filled with thermal insulation material.

5. The converter oxygen lance nozzle dust removal device according to claim 1, characterized in that, The dust removal duct is wrapped with insulation material.

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