Converter oxygen lance mouth micro-pressure secondary sealing device

Abstract

The utility model relates to a converter oxygen lance mouth micro-pressure secondary sealing device which comprises an upper sealing device, a bottom sealing device and a fixed sealing flange arranged on an oxygen lance, the fixed sealing flange is connected with the upper sealing device, and the bottom sealing device is arranged below the upper sealing device. A telescopic sealing pipe is connected between the upper sealing device and the bottom sealing device, the lower portion of the upper sealing device and the upper portion of the bottom sealing device are respectively provided with a plurality of hanging rings in one-to-one correspondence, a chain is connected between the corresponding hanging rings, and the outer side of the oxygen lance located at the bottom sealing device is sleeved with a slag stopping and exhausting device. According to the nitrogen sealing device, sealing is tight, nitrogen is not consumed in the process, and pollutant emission is reduced; and a slag stopping and exhausting device is arranged on the inner side of the bottom of the telescopic sealing pipe, so that the equipment can bear the damage of on-site slag in the working process, and the safety and environmental protection problems are reduced.

Description

Technical Field

[0001] This utility model relates to the field of converter steelmaking technology, specifically to a converter oxygen lance nozzle micro-pressure secondary sealing device. Background Technology

[0002] In the steelmaking process, converter steelmaking is one of the most critical fundamental processes. The core equipment of the oxidation-reduction reaction unit is the converter oxygen lance, and its outlet sealing structure directly affects production efficiency and product quality. In existing technologies, the oxygen lance outlet is usually sealed with inert gases such as nitrogen. However, in the later stages of converter operation, the injection phenomenon of the oxygen supply system can lead to abnormal operation, resulting in the emission of yellow smoke. These smoke particles enter the workshop through the oxygen pipeline, and especially under the influence of a large blast field, components such as CO can overflow and not be fully oxidized, posing significant safety hazards and environmental emission problems.

[0003] To address the aforementioned issues, existing technologies have proposed a partial modification scheme using a Φ57mm seamless steel pipe. However, in practical application, it has been found that when this structure operates under stable pressure in the main steam pipe, the velocity distribution at the converter outlet is extremely uneven, and the lack of a vortex device results in poor sealing performance and a risk of leakage.

[0004] Based on this, patent CN215162894U discloses a telescopic sealing device for the inlet of a converter oxygen lance. This device includes structural components such as an upper sealing cover, an inlet sealing cover, a telescopic tube cover, a hanger, a base, a guide wheel seat, a winding roller seat, a winding motor, a lifting line, and slag-blocking components. The upper sealing cover is connected to the inlet sealing cover by a telescopic tube cover fitted around the outside of the converter oxygen lance, and is fixed to the base by the hanger. The guide wheel seat and a winding roller seat with a winding motor are installed on the base; the winding motor is used to wind the lifting line. Simultaneously, two slag-blocking components are respectively installed between the upper sealing cover and the inlet sealing cover.

[0005] However, the aforementioned converter oxygen lance inlet telescopic sealing device has the following shortcomings: First, the device's operation, which uses a winding motor to rewind the suspension cable, requires wiring at the oxygen lance, but power is usually lacking near the lance, and the internal structure is prone to cable damage under high temperatures. Second, although a slag-blocking assembly is installed, the large gaps between the device's structural components frequently cause slag to pass through the gaps in the slag-blocking assembly and burn the telescopic pipe during field use, resulting in decreased sealing performance. Therefore, further optimization and improvement are needed. Summary of the Invention

[0006] The purpose of this invention is to overcome the aforementioned problems in the existing technology and provide a converter oxygen lance nozzle micro-pressure secondary sealing device that provides a tight seal without consuming nitrogen during the process, thereby reducing pollutant emissions. A slag-blocking and exhaust device is provided on the inner side of the bottom of the telescopic sealing tube, which enables the equipment to withstand the damage from molten slag during operation, reducing safety and environmental issues.

[0007] To achieve the above technical objectives, this utility model is implemented through the following technical solution: a converter oxygen lance nozzle micro-pressure secondary sealing device, including an upper sealing device, a bottom sealing device, and a fixed sealing flange installed on the oxygen lance. The fixed sealing flange is connected to the upper sealing device, and the bottom sealing device is located below the upper sealing device. A telescopic sealing pipe is connected between the upper sealing device and the bottom sealing device. Several corresponding lifting rings are respectively provided at the lower part of the upper sealing device and the upper part of the bottom sealing device. Chains are connected between the corresponding lifting rings. A slag-blocking and exhaust device is sleeved on the outside of the oxygen lance located at the bottom sealing device, and a nitrogen sealing seat is provided below the bottom sealing device.

[0008] As a further improvement to the above technical solution:

[0009] The slag-blocking and venting device is movably connected to the bottom sealing device. The slag-blocking and venting device includes a sleeve with several vent holes and an anti-detachment plate at the bottom of the sleeve.

[0010] A sealing refractory material layer is provided above the sleeve.

[0011] The bottom sealing device has several layers of partitions inside, and the partitions have several holes.

[0012] The holes are sparsely distributed in a position away from the center of the bottom sealing device, and densely distributed in a position close to the center of the bottom sealing device.

[0013] The bottom of the bottom sealing device has several protrusions.

[0014] The nitrogen sealing seat is equipped with a primary sealing device. The oxygen lance at the bottom of the primary sealing device is equipped with a locking block. The primary sealing device is fitted onto the outside of the oxygen lance through the locking block.

[0015] The protrusion is in the shape of an inverted cone or a cuboid.

[0016] The fixed sealing flange is positioned above the upper sealing device, and the telescopic sealing tube is sleeved on the outside of the oxygen lance.

[0017] A sealing gasket is provided between the fixed sealing flange and the upper sealing device.

[0018] The beneficial effects of this utility model are: the structure of this utility model is reasonable. By setting a telescopic sealing tube made of high temperature and wear resistant material on the outside of the converter oxygen lance, it can adapt to the changes of different lance positions. It adopts a physical sealing method, which is tight and does not consume nitrogen during the process, thus reducing pollutant emissions. A slag-blocking and exhaust device is provided on the bottom inner side of the telescopic sealing tube, which enables it to withstand the damage of molten slag on site during equipment operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a converter oxygen lance nozzle micro-pressure secondary sealing device after stretching in an embodiment of this utility model;

[0020] Figure 2 for Figure 1 A sectional view;

[0021] Figure 3 This is a schematic diagram of the bottom sealing device and sleeve in an embodiment of the present invention;

[0022] Figure 4 This is a cross-sectional view of the bottom sealing device and the slag-blocking and exhaust device in an embodiment of this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of a converter oxygen lance nozzle micro-pressure secondary sealing device after compression, according to an embodiment of this utility model.

[0024] In the diagram, 1-Oxygen lance, 2-Fixed sealing flange, 3-Upper sealing device, 4-Lifting ring, 5-Chain, 6-Telescopic sealing pipe, 7-Bottom sealing device, 701-Baffle plate, 702-Hole, 703-Protrusion, 8-Slag blocking and venting device, 801-Sealing refractory material layer, 802-Sleeve, 803-Anti-detachment plate, 804-Ventilation hole, 9-Primary sealing device, 10-Nitrogen sealing seat, 11-Clamping block. Detailed Implementation

[0025] like Figure 1-5 As shown, a converter oxygen lance nozzle micro-pressure secondary sealing device includes an upper sealing device 3, a bottom sealing device 7, and a fixed sealing flange 2 mounted on the oxygen lance 1. The upper sealing device 3, the bottom sealing device 7, and the fixed sealing flange 2 are each provided with through holes that allow the oxygen lance 1 to pass through. The fixed sealing flange 2 is fixed to the oxygen lance 1 by bolts, welding, or other methods, playing a crucial role in fixing, connecting, and sealing. The fixed sealing flange 2 is positioned above the upper sealing device 3 and connected to it. The bottom sealing device 7 is positioned below the upper sealing device 3. A telescopic sealing tube 6 connects the upper sealing device 3 and the bottom sealing device 7. The telescopic sealing tube 6 is sleeved on the outside of the oxygen lance 1 and is made of high-temperature resistant and wear-resistant material. It can expand and contract with the position of the oxygen lance 1, always sealing the space around the oxygen lance 1.

[0026] The lower part of the upper sealing device 3 and the upper part of the bottom sealing device 7 are respectively provided with several corresponding lifting rings 4, and the corresponding lifting rings 4 are connected by chains 5. This structure ensures the stability of the entire sealing device.

[0027] A slag-blocking and venting device 8 is fitted on the outside of the oxygen lance 1 located at the bottom sealing device 7. The slag-blocking and venting device 8 is movably connected to the bottom sealing device 7. The slag-blocking and venting device 8 includes a sleeve 802, which has several vent holes 804 for venting. A sealing refractory material layer 801 is provided above the sleeve 802, and an anti-detachment plate 803 is provided at the bottom of the sleeve 802. The sealing refractory material layer 801 is filled with sealing refractory materials such as asbestos, which can both vent gas and prevent high-temperature slag from splashing and damaging the telescopic sealing pipe 6, thus maintaining the pressure balance inside the furnace.

[0028] The bottom sealing device 7 has several layers of partitions 701 inside, and several holes 702 on the partitions 701. The holes 702 are sparsely distributed in the position away from the center of the bottom sealing device 7 and densely distributed in the position close to the center of the bottom sealing device 7. The distribution of the holes 702 allows the airflow to form a certain turbulence during the exhaust process, reducing the deposition of dust on the partitions and preventing dust from entering the gap between the telescopic sealing tube 6 and the oxygen gun 1, thereby preventing dust accumulation from affecting the telescopic sealing tube 6's elasticity. The bottom sealing device 7 is made of high temperature resistant material and is not easily deformed or damaged.

[0029] The bottom of the bottom sealing device 7 is provided with several protrusions 703. The protrusions 703 are in the shape of an inverted cone, a cuboid, or other shapes, which can prevent the sealing effect from being affected by dust on the initial sealing device 9.

[0030] Below the bottom sealing device 7 is a nitrogen sealing seat 10, inside which is a primary sealing device 9. At the bottom of the primary sealing device 9, there is a locking block 11 on the oxygen lance 1. The primary sealing device 9 is fitted onto the outside of the oxygen lance 1 through the locking block 11. When the primary sealing device 9 is working, it fits tightly with the nitrogen sealing seat 10. Under normal working conditions, the bottom sealing device 7 covers the primary sealing device 9, effectively preventing flue gas leakage.

[0031] The primary sealing device 9 is made of high-temperature resistant material. The interior can be solid or filled with inert gases such as nitrogen for cooling. Nitrogen can be introduced from an external gas source. Gas flow is achieved through the gas channel set inside the primary sealing device 9 to ensure stable sealing at high temperatures.

[0032] A sealing gasket can also be installed between the fixed sealing flange 2 and the upper sealing device 3 to prevent flue gas leakage.

[0033] Under different operating conditions, such as the initial stage of blowing when the oxygen lance 1 is deeply inserted and the telescopic sealing tube 6 is stretched; and the later stage when the oxygen lance 1 is raised and the telescopic sealing tube 6 is compressed. However, all components always work together. The initial sealing device 9 blocks the smoke and dust, the telescopic sealing tube 6 maintains the seal, the bottom sealing device 7 protects and assists in the seal, and the slag blocking and venting device 8 prevents slag and vents air, all working together to prevent the smoke and dust from overflowing and reduce safety and environmental problems.

[0034] This utility model has a reasonable structural design. By setting a telescopic sealing tube 6 made of high temperature and wear resistant material on the outside of the oxygen lance of the converter, it can adapt to the changes of different lance positions. It adopts a physical sealing method, which is tight and does not consume nitrogen during the process, thus reducing pollutant emissions. A slag-blocking and exhaust device 8 is provided on the bottom inner side of the telescopic sealing tube 6, which enables the equipment to withstand the damage of molten slag on site during operation.

[0035] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Examples of implementation methods are provided, and any parts not described in detail are common knowledge to those skilled in the art. Those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A secondary sealing device for a converter oxygen lance nozzle, characterized in that: The device comprises an upper sealing device (3), a bottom sealing device (7) and a fixed sealing flange (2) arranged on the oxygen lance (1), the fixed sealing flange (2) is connected with the upper sealing device (3), the bottom sealing device (7) is arranged below the upper sealing device (3), the upper sealing device (3) and the bottom sealing device (7) are connected with the telescopic sealing pipe (6), the lower part of the upper sealing device (3) and the upper part of the bottom sealing device (7) are respectively provided with a plurality of corresponding lifting rings (4), the corresponding lifting rings (4) are connected with the chain (5), the outer side of the oxygen lance (1) located at the bottom sealing device (7) is sleeved with the slag blocking and exhaust device (8), and the bottom of the bottom sealing device (7) is provided with the nitrogen sealing seat (10).

2. The secondary sealing device for the lance nozzle of a converter according to claim 1, characterized in that: The slag blocking and exhaust device (8) is movably connected with the bottom sealing device (7), the slag blocking and exhaust device (8) comprises a sleeve pipe (802), a plurality of exhaust holes (804) are arranged on the sleeve pipe (802), and the bottom of the sleeve pipe (802) is provided with an anti-falling plate (803).

3. The secondary sealing device for the lance nozzle of a converter according to claim 2, characterized in that: The upper part of the sleeve pipe (802) is provided with a sealing refractory material layer (801).

4. The secondary sealing device for the lance nozzle of a converter according to claim 1, characterized in that: The bottom sealing device (7) is provided with a plurality of layers of partition plates (701), and the partition plates (701) are provided with a plurality of holes (702).

5. The secondary sealing device for the lance nozzle of a converter according to claim 4, characterized in that: The plurality of holes (702) are sparsely distributed away from the center of the bottom sealing device (7) and densely distributed close to the center of the bottom sealing device (7).

6. The secondary sealing device for the lance nozzle of a converter according to claim 5, characterized in that: The bottom of the bottom sealing device (7) is provided with a plurality of protrusions (703).

7. The secondary sealing device for the lance nozzle of a converter according to claim 1, characterized in that: The nitrogen sealing seat (10) is provided with a primary sealing device (9), the oxygen lance (1) at the bottom of the primary sealing device (9) is provided with a clamping block (11), and the primary sealing device (9) is sleeved on the outer side of the oxygen lance (1) through the clamping block (11).

8. The secondary sealing device for the lance nozzle of a converter according to claim 6, characterized in that: The protrusions (703) are in the shape of inverted cone or cuboid.

9. The secondary sealing device for the lance nozzle of a converter according to claim 1, characterized in that: The fixed sealing flange (2) is arranged above the upper sealing device (3), and the telescopic sealing pipe (6) is sleeved on the outer side of the oxygen lance (1).

10. The secondary sealing device for the lance nozzle of a converter according to claim 1, characterized in that: The fixed sealing flange (2) and the upper sealing device (3) are provided with a sealing gasket therebetween.

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