Oxygen lance opening sealing device in converter waste heat boiler

Abstract

The invention discloses an oxygen lance muzzle sealing device in a converter waste heat boiler, which comprises a sealing seat and a nitrogen sealing plug, at least one upper nitrogen inlet is arranged on the nitrogen sealing plug and distributed at the top of the nitrogen sealing plug, and each upper nitrogen inlet is hermetically connected with an upper nitrogen connecting pipe; the sealing seat is of a double-layer sealing seat structure composed of a steam sealing seat and a nitrogen sealing seat fixedly arranged at the bottom of the steam sealing seat. Double-layer sealing of an oxygen lance opening is achieved through first air curtain nitrogen sealing of the nitrogen sealing plug part and second nitrogen ring sealing of the nitrogen sealing seat part in the initial smelting stage, after operation is stable, nitrogen supply of the nitrogen sealing seat part is stopped, steam is supplied to the steam sealing seat part through steam generated by a converter waste heat boiler, and the oxygen lance opening is sealed. At the moment, double-layer sealing of the oxygen lance opening is achieved through first air curtain nitrogen sealing of the nitrogen sealing plug part and second steam ring sealing of the steam sealing seat part, and the oxygen lance opening sealing device has the advantages of being good in sealing effect, long in service life, low in operation cost and the like.

Description

technical field [0001] The invention relates to the field of converter waste heat boilers, in particular to an oxygen muzzle sealing device in a converter waste heat boiler. Background technique [0002] The converter waste heat boiler is a flue-type waste heat boiler, which is widely used to recover the heat in the coal gas, high-temperature flue gas and dust generated during converter steelmaking in steel mills. The converter waste heat boiler is directly linked to the production process of converter steelmaking, and directly participates in production as a part of the steelmaking process of the steel plant. Converter waste heat boiler includes: movable hood, furnace mouth section flue, middle I section flue, middle II section flue, middle III section flue, tail flue. An oxygen lance is provided on the furnace front side water cooling wall of the furnace mouth section flue directly above the center of the furnace mouth, and an oxygen lance mouth water cooling jacket is ar...

AI Technical Summary

Problems solved by technology

[0005] First, the nitrogen sealing seat 11 and the nitrogen sealing plug 12 are connected to nitrogen gas through a small hole, and the contact surface of the two needs to be machined to ensure the sealing. The nitrogen sealing seat 11 is installed above the oxygen gun mouth. 11 is directly subjected to high-temperature flue gas erosion, and the nitrogen sealing seat 11 and the nitrogen sealing plug 12 are easily deformed by heat over time, resulting in a gap between the nitrogen sealing seat 11 and the nitrogen sealing plug 12 due to deformation, and a large gap will As a result, the nitrogen gas in the nitrogen sealing seat 11 cannot enter the nitrogen sealing plug 12 in sufficient amount, and the insufficient air intake in the nitrogen sealing plug 12 eventually leads to insufficient nitrogen gas between the nitrogen sealing plug 12 and the oxygen lance 1, and the effect of the air curtain nitrogen sealing is not ideal

[0006] Second, when the oxygen lance 1 is lowered, it will inevitably be deflected, causing the small holes on the nitrogen sealing seat 11 and the small holes on the nitrogen sealing plug 12 to be unable to effectively dock, and then causing the nitrogen gas in the nitrogen sealing seat 11 to be insufficient. Entering the nitrogen sealing plug 12, the insufficient air intake in the nitrogen sealing plug 12 eventually leads to insufficient nitrogen gas between the nitrogen sealing plug 12 and the oxygen lance 1, and the effect of the air curtain nitrogen sealing is not ideal

[0007] Third, the oxygen gun muzzle sealing device uses nitrogen gas sealing during operation, which consumes a lot of nitrogen gas and high operating costs

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