On-line slagging method and device of continuous heating furnace

Abstract

The invention discloses an on-line slagging method and device of a continuous heating furnace. The on-line slagging method comprises the following steps: slagging agents are continuously blown into a furnace bottom under the action of carrier gas through an on-line blowing and slagging device equipped with the slagging agents, enabling the slagging agents and solid slag in the furnace to be fully reacted to generate liquid slag with low melting point, and discharging the liquid slag from a liquid slag discharging system. The on-line blowing and slagging device comprises a carrier gas-blowing pipeline, a blowing tank connected with the output end of the carrier gas-blowing pipeline, a spray gun connected with the blowing tank, and sleeves pre-buried in the furnace walls on the lower sides of the second heating section and the soak section of the heating furnace; the blowing tank is connected with the spray gun through a flexible pipe. The slagging method ensures that steel slag is always in the liquid-phase state within the range of the working temperature of the heating furnace, improves the liquid slag tapping ratio, improves the periodic rolling quantity of oriented silicon steel, reduces the overhaul and slag removal frequency of the heating furnace, and has the advantages that the operation is simple, the implementation is convenient, and the effect is remarkable. The slagging device has a simple structure, is convenient to operate, low in manufacturing cost, and low in operation cost.

Description

technical field [0001] The invention relates to an on-line slag removal method of a heating furnace, in particular to an on-line slag removal method of a continuous heating furnace and a device thereof. Background technique [0002] Oriented silicon steel is an indispensable key material in industries such as electric power engineering and motor manufacturing. Therefore, the production of oriented silicon steel is of great economic benefit to iron and steel enterprises. Compared with ordinary steel, oriented silicon steel is not only complicated in production process, but also requires strict manufacturing technology. It is known as "special steel art". Many production links limit the further increase of silicon steel output. For example, in the production process of grain-oriented silicon steel, in order to stabilize the magnetism of the finished product and reduce the magnetic fluctuation caused by uneven heating, the heating temperature and heating time of the slab in the...

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Problems solved by technology

[0005] Although the above-mentioned technology, to a certain extent, promotes the discharge of liquid slag, reduces the intensity of manual slag removal after the shutdown of the furnace, and plays a role in improving the degree of slag accumulation in the furnace during the production process, but for the solid slag deposited on the bottom of the furnace after solidification Cannot carry out effective online discharge

[0006] According to the public literature data, the maximum liquid slag discharge rate of the current high-temperature heating furnace is about 40%, which cannot solve the problem that about 60% of the solid slag in the furnace is discharged online at the working temperature of the heating furnace

In actual production, due to various reasons such as air suction at the furnace bottom of the heating furnace, heat dissipation at the water beam column and furnace bottom, failure of the production rolling line, heating furnace cooling down and waiting for rolling, etc., the temperature at the furnace bottom of the heating furnace is often lower than the melting point of steel slag. The slag falling from the billet often condenses and accumulates in large quantities at the bottom of the furnace, and cannot be discharged online through the liquid slag discharge system of the heating furnace

[0007] Especially in the soil enclosure of the active beam column and the middle of two adjacent columns, because of the water cooling of the column and the opening structure of the furnace bottom, the temperature here is the lowest, and the fluidity of the steel slag is the worst. This condensation accumulates and gradually blocks the opening space of the movable column, hindering the walking process of the movable beam, causing the water beam of the column to be deformed and bent due to obstruction, and in severe cases, the beam and column will be torn and leak water

At the same time, the high-temperature solid slag is in contact with the column for a long time, which will easily cause the column to generate local high temperature and vaporization, resulting in perforation of the column and water leakage, etc., forcing the heating furnace to be shut down for maintenance, and the normal operation of the furnace bottom mechanical equipment cannot be guaranteed, resulting in production. Problems such as low efficiency, high labor intensity and high maintenance cost

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