Built-in air seal device for oxygen lance opening of converter

Abstract

The invention discloses a built-in air seal device for a converter oxygen lance opening. The built-in air seal device comprises an air seal body and an air pressure jet nozzle, the air pressure jet nozzle is mounted on the air sealing body; and a nozzle of the air pressure jet nozzle is arranged in the sealing surface of the air sealing body. By the adoption of the technical scheme, the gas sealing device can operate independently, the gas utilization rate is greatly increased, and the gas sealing effect is good; the gas consumption is low, and the instantaneous flow is 1600 m < 3 > / h; maintenance is avoided; energy is saved, the instantaneous flow is reduced to 1600 m < 3 > / h, and the monthly gas saving amount is 17.64 thousand cubic meters; the annual benefit is about 42.30 thousand yuan; environmental protection accidents are avoided; the maintenance workload is reduced; and the operation noise is low, and the actually measured noise is reduced to 60 decibels.

Description

Technical Field

[0001] This invention belongs to the technical field of converter production equipment and process equipment in the metallurgical industry. More specifically, this invention relates to a built-in gas seal device for the oxygen lance nozzle of a converter. Background Technology

[0002] The converter oxygen lance inlet gas seal device is a safety protection device used during smelting to isolate flue gas and prevent its leakage, which could cause safety and environmental accidents. Figure 1 As shown, it includes: oxygen lance 1, oxygen lance inlet gas sealing device 2, vaporization flue 3, and top-blown converter 4.

[0003] Existing devices use annular gas seals, such as... Figure 2 As shown, it includes: a vaporization flue 1, an oxygen lance inserter 2, a nitrogen sealing seat 3, and a nitrogen sealing cap 4. Gas is introduced into the nitrogen sealing cap 4 through the nitrogen sealing seat 3 to form a gas seal. Its disadvantages are as follows:

[0004] 1. The nitrogen sealing cap is installed on the oxygen lance and is paired with the nitrogen sealing seat by its own weight. Due to the influence of the inherent process, the gas delivery efficiency is about 30%, which is low.

[0005] 2. The air seal is external, and the on-site noise reaches about 120 decibels, causing environmental pollution;

[0006] 3. External gas seals are limited by their own structure, resulting in the leakage of flue gas mixed with the gas and poor gas sealing effect;

[0007] 4. The instantaneous nitrogen consumption of the external device is approximately 3700 m³. 3 / h, high gas consumption.

[0008] Using keywords such as "converter; oxygen lance; flue gas; gas seal; device", a search was conducted on existing publicly available technical documents, yielding the following results:

[0009] 1. Chinese patent document: "A gas sealing device for oxygen lance nozzle of a smelting converter", patent (application) number: 201320890969.1; the technical solution described therein is:

[0010] "The oxygen lance nozzle gas sealing device of the smelting converter includes a gas sealing box, a first flange, a sealing plate, and a second flange. The gas sealing box is a hollow annular box with venting oblique holes on the side wall. The first flange and the second flange are fixedly connected to the upper and lower ends of the gas sealing box, respectively. The sealing plate is fixedly connected to the first flange, the second flange, and the first gas supply pipe, respectively. The sealing plate, the first flange, the second flange, and the gas sealing box together form a gas distribution box, which is connected to the first gas supply pipe."

[0011] The technical effects described are:

[0012] The device is installed at the oxygen lance water jacket nozzle of the smelting converter. When the smelting converter is working, the nitrogen gas flow for gas sealing enters the gas distribution box from the first gas supply pipe and enters the oxygen lance water jacket nozzle through the venting oblique hole to form a high-speed vortex airflow, thereby sealing the entire oxygen lance water jacket nozzle, preventing a large amount of yellow smoke from being emitted into the atmosphere, and preventing environmental accidents. It has outstanding advantages such as simple installation and low cost.

[0013] 2. Chinese patent document: "A nitrogen sealing device for oxygen lance nozzle of a converter", patent (application) number: 202211402728.8; the technical solution described therein is:

[0014] "The converter oxygen lance nozzle nitrogen sealing device includes an oxygen lance nozzle, an oxygen lance installed inside the nozzle, a nitrogen sealing plug fitted on the oxygen lance, a nitrogen sealing seat between the nitrogen sealing plug and the oxygen lance nozzle, a nitrogen sealing seat connected to a nitrogen gas pipe, a valve on the nitrogen gas pipe, and a 30-degree inclined gas sealing hole on one side of the nitrogen sealing seat near the oxygen lance. This device employs a 30-degree inclined gas sealing hole located in the middle of the inner ring of the nitrogen sealing seat near the oxygen lance."

[0015] The technical effects described are:

[0016] "The nitrogen gas flow is directly sprayed through the gas seal hole onto the inner wall of the oxygen lance, forming a nitrogen seal, which improves the nitrogen sealing effect and prevents the phenomenon of smoke coming out of the oxygen lance nozzle."

[0017] However, the technical solutions described in the aforementioned technical documents, as well as the existing publicly available technical solutions, have not been able to solve the problems and defects in the existing technology, such as "low gas conduction efficiency", "high noise", and "poor gas sealing effect". Summary of the Invention

[0018] This invention provides a built-in gas seal device for the oxygen lance nozzle of a converter, the purpose of which is to improve the gas seal effect.

[0019] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0020] The converter oxygen lance nozzle built-in gas seal device of the present invention includes a gas sealing body and a gas pressure injection nozzle; the gas pressure injection nozzle is installed on the gas sealing body; the nozzle of the gas pressure injection nozzle is placed within the sealing surface of the gas sealing body.

[0021] The number of the air pressure nozzles is eight or more, and they are evenly distributed along the circumference of the sealing surface of the gas sealing body.

[0022] The air pressure nozzle is connected to the distribution ring pipe, and the distribution ring pipe is provided with an air inlet connection pipe. The distribution ring pipe is connected to the air supply pipeline through the air inlet connection pipe.

[0023] The distribution ring tube is circular, with its plane parallel to the sealing surface of the gas sealing body and its center coinciding with the axis of the gas sealing body.

[0024] The air pressure nozzles are tilted downwards at 45°, and the axes of all the air pressure nozzles intersect at a point on the vertical axis of the gas sealing body.

[0025] Multiple annular tube supports are fixedly connected to the outer circumference of the gas-sealed body, and the distribution annular tube is supported by the annular tube supports.

[0026] The gas sealing body is provided with a gas vent.

[0027] The pneumatic nozzle includes a connected inflation chamber and an acceleration chamber. The port of the inflation chamber is connected to a distribution ring pipe. The port of the acceleration chamber is a nozzle. The transition from the inflation chamber to the acceleration chamber is a gradual change in the cross-section of the pneumatic nozzle from round to flat, thus reducing the outlet cross-sectional area.

[0028] The instantaneous nitrogen flow rate of the gas sealing device is 1600 m³ / s. 3 / h.

[0029] This invention employs the above-mentioned technical solution, enabling the gas sealing device to operate independently, significantly improving gas utilization, and achieving excellent gas sealing performance; it also features low gas consumption and an instantaneous flow rate of 1600 m³ / h. 3 / h; maintenance-free; energy-saving, instantaneous flow rate reduced to 1600m³ / h 3 / h, monthly seasonal volume 2×(3700-1600)×70×(15 / 60)×30=176,400 cubic meters; annual benefit: 176,400 × 0.2 yuan / m³ 3 ×12≈423,000 yuan; eliminate environmental accidents; reduce maintenance workload; low operating noise, with actual noise reduced to 60 decibels. Attached Figure Description

[0030] The following is a brief explanation of the contents shown in the attached figure and the markings therein:

[0031] Figure 1 A schematic diagram of the existing converter oxygen lance inlet gas seal device;

[0032] Figure 2 A schematic diagram of a device in the prior art employing an annular gas seal;

[0033] Figure 3 This is a schematic diagram of the structure of the present invention;

[0034] Figure 4 for Figure 3 Top view of the structure shown;

[0035] Figure 5 for Figure 3 A three-dimensional view of the structure shown;

[0036] Figure 6 for Figure 3 A 3D rendering of the structure shown;

[0037] Figure 7 This is a schematic diagram of the structure of the pneumatic jet nozzle of the present invention.

[0038] The diagram is marked as follows:

[0039] 1. Gas sealing body, 2. Air pressure injection nozzle, 3. Distribution ring pipe, 4. Inflation chamber, 5. Speed-up chamber, 6. Inlet connecting pipe, 7. Discharge port, 8. Ring pipe support. Detailed Implementation

[0040] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0041] like Figures 3 to 7 The structure of the present invention shown is a gas sealing device with an internal gas seal at the oxygen lance nozzle of a converter, comprising a gas sealing body 1 and a gas pressure injection nozzle 2.

[0042] In order to solve the problems and overcome the defects of the existing technology and achieve the invention objective of improving the air sealing effect, the technical solution adopted by the present invention is as follows:

[0043] like Figures 3 to 7 As shown, in the converter oxygen lance built-in gas seal device of the present invention, the gas pressure injection nozzle 2 is installed on the gas sealing body 1; the nozzle of the gas pressure injection nozzle 2 is placed inside the sealing surface of the gas sealing body 1.

[0044] This invention redesigns the gas seal form, namely, the oxygen gun nozzle built-in gas seal device, without changing the assembly dimensions of existing equipment, thus solving the problems and defects of the existing technology.

[0045] The gas sealing device of this invention is not affected by existing equipment pairing, can operate independently, has 100% gas utilization, good gas sealing effect, low gas consumption, and an instantaneous flow rate of 1600 m³ / h. 3 / h; maintenance-free, reducing maintenance workload;

[0046] Economic benefits: Energy saving; the nitrogen consumption of the external unit is 3700 m³. 3 / h; After the upgrade, the instantaneous flow rate is 1600m³ / h. 3 / h, monthly seasonal volume 2×(3700-1600)×70×(15 / 60)×30=176,400 cubic meters; annual benefit: 176,400 × 0.2 yuan / m³3 ×12≈423,000 yuan.

[0047] Social benefits: 1. Eliminates environmental accidents; 2. This device requires no maintenance; 3. Low operating noise, with actual measured noise level of approximately 60 decibels.

[0048] The number of air pressure nozzles 2 is eight or more, and they are evenly distributed along the circumference of the sealing surface of the gas sealing body 1, forming a complete circular gas sealing effect.

[0049] The air pressure nozzle 2 is connected to the distribution ring pipe 3, and the distribution ring pipe 3 is provided with an air inlet connection pipe 6. The distribution ring pipe 3 is connected to the air supply pipeline through the air inlet connection pipe 6.

[0050] The nozzle 2 is fixed on the gas sealing body 1. Gas enters the distribution ring pipe 3 and is ejected through eight or more nozzles 2 to form a circular gas cover.

[0051] The distribution ring tube 3 is circular, with its plane parallel to the sealing surface of the gas sealing body 1 and its center coinciding with the axis of the gas sealing body 1.

[0052] The air pressure nozzle 2 is tilted downward at 45°, and the axes of all the air pressure nozzles 2 intersect at a point on the vertical axis of the gas sealing body 1.

[0053] Referring to Bernoulli's principle, eight or more nozzles 2 are evenly arranged and 45° downwards to form a circular gas cover. Below the gas cover is a high-pressure, strong gas, and above the gas cover is a low-pressure, strong gas. In the whole process, the gas and the surrounding air move downwards in the oxygen lance, eventually suppressing the smelting flue gas from overflowing and forming an internal pressure gas seal.

[0054] Multiple annular tube supports 8 are fixedly connected to the outer circumference of the gas sealing body 1, and the distribution annular tube 3 is supported by the annular tube supports 8.

[0055] The gas-sealed body 1 is provided with a vent 7. Excess gas is discharged through the vent 7.

[0056] The pneumatic nozzle 2 includes an inflatable chamber 4 and a speed-increasing chamber 5 connected together. The port of the inflatable chamber 4 is connected to the distribution ring pipe 3. The port of the speed-increasing chamber 5 is the nozzle. The cross-section of the pneumatic nozzle 2 gradually changes from round to flat from the inflatable chamber 4 to the speed-increasing chamber 5, so that its outlet cross-sectional area is reduced.

[0057] The nozzle 2 adopts a pressurized air hole design. Due to the reduced cross-section, the airflow speed increases and enters the speed-increasing chamber 5 from the inflation chamber 4, which improves the strength and density of the outlet gas and results in a better air seal effect.

[0058] The instantaneous nitrogen flow rate of the gas sealing device is 1600 m³ / s. 3 / h.

[0059] The instantaneous flow rate of nitrogen has been reduced from 3700 m³ / s in existing technologies. 3 / h reduced to 1600m 3 / h, improving the air seal effect, reducing air consumption, and saving energy and costs.

[0060] The noise level has been reduced from 120 decibels to about 60 decibels, resulting in better environmental protection.

[0061] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A built-in gas seal device for oxygen lance of converter, comprising a gas seal body (1), a gas pressure injection nozzle (2), characterized in that: The gas pressure injection nozzle (2) is installed on the gas sealing body (1); the nozzle of the gas pressure injection nozzle (2) is arranged in the sealing surface of the gas sealing body (1).

2. The lance in-conduit gas seal apparatus for a converter as claimed in claim 1, characterized in that: The number of the gas pressure injection nozzle (2) is eight or more, and is evenly distributed along the circumferential direction of the sealing surface of the gas sealing body (1).

3. The lance in-conduit gas seal apparatus for a converter as claimed in claim 2, wherein: The gas pressure injection nozzle (2) is connected with the distribution ring pipe (3), the distribution ring pipe (3) is provided with the air inlet connecting pipe (6), and the distribution ring pipe (3) is communicated with the air supply pipeline through the air inlet connecting pipe (6).

4. The lance in-conduit gas seal apparatus for a converter as claimed in claim 3, wherein: The distribution ring pipe (3) is a circular ring, the plane of the circular ring is parallel to the sealing surface of the gas sealing body (1), and the center of the circular ring is coincided with the axis of the gas sealing body (1).

5. The lance in-conduit gas seal apparatus for a converter as claimed in claim 2, wherein: The gas pressure injection nozzle (2) is inclined downward by 45°, and the axes of all the gas pressure injection nozzles (2) intersect at a point on the vertical axis of the gas sealing body (1).

6. The lance in-conduit gas seal apparatus for a converter as claimed in claim 4, wherein: A plurality of ring pipe supports (8) are arranged on the outer circumference of the gas sealing body (1) and fixedly connected with the gas sealing body (1), and the distribution ring pipe (3) is supported by the ring pipe supports (8).

7. The oxygen lance in-vessel gas seal apparatus of claim 1, wherein: The gas sealing body (1) is provided with a gas dispersing port (7).

8. The oxygen lance in-vessel gas seal apparatus of claim 1, wherein: The gas pressure injection nozzle (2) comprises a communication air filling cavity (4) and a speed increasing cavity (5), the port of the air filling cavity (4) is connected with the distribution ring pipe (3), the port of the speed increasing cavity (5) is the nozzle, and the cross section of the gas pressure injection nozzle (2) from the air filling cavity (4) to the speed increasing cavity (5) gradually changes from a circle to a flat, so that the outlet cross section area is reduced.

9. The oxygen lance in-vessel gas seal apparatus of claim 1, wherein: The nitrogen instantaneous flow of the gas seal device is 1600 m 3 / h.

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