Optimized converter oxygen lance nitrogen sealing base

Abstract

The utility model discloses an optimized converter oxygen lance nitrogen seal base which solves the problem that an air inlet hole is blocked. The base is composed of an external air inlet chamber with an air inlet flange and an annular internal air inlet chamber, the upper portion of the internal air inlet chamber is provided with a cylindrical outer wall, the lower portion of the internal air inlet chamber is provided with a conical cylinder bottom wall and a cylindrical inner wall located in the center, and inner air inlet holes are evenly distributed in the cylindrical inner wall in the circumferential direction. Vent holes are evenly formed in the annular top face of the outer air inlet chamber at intervals, vent holes are evenly formed in the circumferential wall of the lower portion of the outer wall of the cylinder at intervals, and the vent holes form an air inlet channel leading to the inner air inlet chamber from the air inlet flange.

Description

Technical Field

[0001] The utility model relates to an optimized converter oxygen lance nitrogen sealing base. Background Art

[0002] The nitrogen sealing device used in oxygen top-blown converters and oxygen top-bottom combined-blown converters during smelting is mainly composed of two parts: an oxygen lance nitrogen sealing plug and a nitrogen sealing base. The oxygen lance nitrogen sealing plug is attached to the oxygen lance body, while the nitrogen sealing base is attached to the smoke hood at the oxygen lance hole. Function of the nitrogen sealing device: When the oxygen lance is in the process of preparing to smelt the lance in the converter, the nitrogen sealing plug on the lance body is inserted into the nitrogen sealing base (Note: the nitrogen sealing base is provided with air holes, and the nitrogen sealing plug is provided with air holes, and the air holes are connected to form a ventilation duct). At this time, the oxygen lance position value is set in the computer program and interlocked with the nitrogen pipeline of the converter nitrogen sealing device. The nitrogen control valve opens automatically, and nitrogen is supplied to the nitrogen sealing base according to the set flow rate. Nitrogen is pressed into the lower cavity of the nitrogen sealing base, and nitrogen is pressed into the internal cavity of the nitrogen sealing plug through the pipeline formed by the air holes of the nitrogen sealing base and the air holes outside the nitrogen sealing plug. There is an air hole near point B in the nitrogen sealing plug cavity. When the pressure of the pressed nitrogen is greater than the hot air pressure caused by the smoke from the converter hood rising to point B, a gas seal is formed, which can isolate the smoke from the hood, so that the smoke from the converter smelting cannot overflow from the nitrogen sealing device, and the smoke from the converter can be separated and purified through the flue.

[0003] Existing problems: The diameter of the existing oxygen gun nitrogen seal inlet hole is φ6mm, which is evenly distributed in a circular ring (with an interval of 15mm). The diameter of the nitrogen seal plug cavity outlet hole is φ4mm, which is evenly distributed in a circular ring (with an interval of 5mm). The outlet hole forms a gas seal perpendicular to the oxygen gun. The nitrogen switch is highly interlocked with the oxygen gun. When the oxygen gun lifts the nitrogen seal plug higher than the nitrogen seal base, the nitrogen is turned off.

[0004] In the actual production process, when the converter smelting gun is lifted to the upper part of the nitrogen sealing plug of the oxygen gun, there is no gas, and the slag is scraped or the gun body is cooled. The accumulated slag on the gun body may fall and hit the air inlet hole of the nitrogen sealing base. The small accumulated slag that falls frequently blocks the air inlet hole, resulting in poor actual gas sealing effect. Similarly, when the oxygen gun is raised above the nitrogen sealing base, the nitrogen sealing gas is closed, and the smoke and dust in the converter flue (especially the dust containing a large amount of FeO generated during the deoxidation and alloying process) overflows from the oxygen gun hole at the connection between the smoke hood and the nitrogen sealing base. The fine particles in the smoke and dust may fall on the air inlet hole of the nitrogen sealing base. In the long run, the air inlet hole of the nitrogen sealing base will be frequently blocked, the nitrogen sealing effect of the oxygen gun will deteriorate, and smoke will appear around the oxygen gun, causing environmental incidents. Summary of the invention

[0005] The purpose of the utility model is to provide an optimized converter oxygen lance nitrogen sealing base, and to optimize the shift of the nitrogen sealing base air inlet eyelet, so as to avoid the blockage of the nitrogen sealing base air inlet eyelet due to the falling of slag and accumulation of dust in the high-gun position operation gun of the oxygen lance during the above-mentioned actual operation process, thereby achieving safe, environmentally friendly and reliable nitrogen sealing, and at the same time reducing the labor intensity of manually cleaning the blocked nitrogen sealing air inlet eyelet.

[0006] The utility model is implemented as follows: an optimized converter oxygen gun nitrogen sealing base, the base is composed of an external air intake chamber with an air intake flange and an internal air intake chamber in an annular shape, the upper part of the internal air intake chamber has a cylindrical outer wall, the lower part has a conical bottom wall and a cylindrical inner wall located at the center, and inner air intake holes are evenly distributed on the cylindrical inner wall in a circumferential manner; the external air intake chamber has air vents evenly spaced on its annular top surface, and the cylindrical outer wall has air vents evenly spaced on its lower circumferential wall, and the air vents constitute an air intake channel from the air intake flange to the internal air intake chamber.

[0007] The utility model shifts the position of the air inlet holes on the bottom wall of the cone cylinder of the original nitrogen sealing base to the outer wall of the cylinder of the nitrogen sealing base. And all the air inlet holes of the original nitrogen sealing base are welded and sealed. The use of the improved nitrogen sealing base avoids the risk of cold slag and cold steel falling from the oxygen lance or dust blockage in the flue gas, ensures the nitrogen sealing effect of the nitrogen sealing base and the nitrogen sealing plug during the converter smelting process, and does not require manual inspection and manual cleaning of the air inlet holes, which is simple and practical; the subsequent operation can achieve the lowest nitrogen cost according to the pressure adjustment, and the controllable nitrogen sealing and environmental protection can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a partial main structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0009] An optimized converter oxygen lance nitrogen sealing base, such as Figure 1 As shown, the base consists of an external air intake chamber with an air intake flange and an internal air intake chamber in an annular shape, the internal air intake chamber having a cylindrical outer wall 3 at the upper portion, a conical bottom wall 1 at the lower portion and a cylindrical inner wall 4 located at the center, the cylindrical inner wall 4 having inner air intake holes evenly distributed in a circumferential pattern; the external air intake chamber has air vents 2 evenly spaced on its annular top surface, the cylindrical outer wall has air vents 2 evenly spaced on its lower circumferential wall, the air vents 2 forming an air intake passage leading from the air intake flange to the internal air intake chamber.

Claims

1. An optimized converter oxygen lance nitrogen sealing base, the base is composed of an external air inlet chamber with an air inlet flange and an annular internal air inlet chamber, the upper part of the internal air inlet chamber has a cylindrical outer wall, the lower part has a conical bottom wall and a cylindrical inner wall located at the center, and the inner air inlet holes are evenly distributed on the inner wall of the cylinder; the characteristics are: The annular top surface of the external air inlet chamber is evenly spaced with air holes, and the lower circumferential wall of the cylindrical outer wall is evenly spaced with air holes, and the air holes constitute an air inlet passage from the air inlet flange to the internal air inlet chamber.

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