A Hearth Corrosion and Thickness Alarm Method for a No-ceramic Cup Vanadium-Titanium-Magnetite Blast Furnace

Abstract

The invention discloses a method for alarming leaching and thickening of a hearth of a vanadium titano-magnetite blast furnace without a ceramic cup. The hearth comprises a hearth side wall zone, a furnace bottom zone and a hearth corner zone, wherein an iron notch and a taphole are arranged on a side wall brick lining of the hearth side wall zone. The method comprises the steps of A, calculating and determining the position of a 1150DEG C leaching line according to a temperature field of the brick lining in the hearth; and B, judging the condition of the leaching and thickening of the hearth side wall zone, the furnace bottom zone and the hearth corner zone of the hearth according to the position of the 1150DEG C leaching line, alarming when the alarming critical point is achieved, wherein the alarming critical point means that the leaching depth at the iron notch of the hearth side wall zone reaches 20-30% of the thickness of the original brick lining at the iron notch, the residue thickness of the hearth corner zone reaches 740-800mm, or the leaching depth of the furnace bottom zone reaches the position of the mullite brick layer.

Description

technical field [0001] The invention belongs to the technical field of blast furnace smelting, and more specifically relates to a method for alarming hearth corrosion junction thickness of a ceramic cup-free vanadium-titanium-magnetite blast furnace. Background technique [0002] Due to the large difference in reducibility between vanadium-titanium magnetite and ordinary iron ore, the corresponding judgment cannot be made based on the smelting of ordinary iron ore when smelting vanadium-titanium magnetite, and the smelting of vanadium-titanium magnetite There are many uncertainties, which also increases the difficulty of monitoring. [0003] Moreover, the vanadium-titanium-magnetite blast furnace has a unique furnace body structure. First, there is no ceramic cup in the hearth of the vanadium-titanium-magnetite blast furnace, so the monitoring of the thickness of the blast furnace hearth erosion is very important. Special characteristics, the corners of the hearth are prone...

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Problems solved by technology

[0002] Due to the large difference in reducibility between vanadium-titanium magnetite and ordinary iron ore, the corresponding judgment cannot be made based on the smelting of ordinary iron ore when smelting vanadium-titanium magnetite, and the smelting of vanadium-titanium magnetite There are many uncertainties, which also increases the difficulty of monitoring

[0003] Moreover, the vanadium-titanium-magnetite blast furnace has a unique furnace body structure. First, there is no ceramic cup in the hearth of the vanadium-titanium-magnetite blast furnace, so the monitoring of the thickness of the blast furnace hearth erosion is very important. Special characteristics, the corners of the hearth are prone to slagging and thickening, which will intensify the circulation of molten iron in the hearth and accelerate the erosion of the hearth, resulting in intensified erosion at the taphole; followed by vanadium-titanium magnetite blast furnace The slag has serious erosion on the slag outlet, causing the position of the slag outlet to leak easily, and the thickness of the slag layer fluctuates greatly during the smelting process of vanadium-titanium magnetite, which has a great adverse effect on the monitoring system. Corresponding warnings cannot be given to the erosion in the hearth of the blast furnace; again, the hearth without ceramic cups will have a certain impact on the corresponding erosion and thickening phenomena, because the function of the ceramic cup is to isolate molten iron and protect carbon bricks from liquid The dissolution of molten iron, as long as the ceramic cup exists stably on the inner surface of the carbon brick lining, the ceramic cup obviously also plays a role in heat insulation and can reduce the temperature on the surface of the carbon brick, which not only saves energy and reduces consumption, but also improves the carbon brick layer. However, since there is no ceramic cup in the hearth of the vanadium-titanium-magnetite blast furnace, the brick lining at the bottom of the furnace will appear in the shape of a shallow pot bottom that is partially eroded only in the center during the smelting process. , and with the progress of vanadium-titanium magnetite smelting, specific deposits will be bonded on the corroded residual brick lining, which plays a role in protecting the brick lining and slowing down the erosion of the furnace bottom brick lining, and The deposits will also be bonded to the furnace wall, and the deposits on the furnace wall gradually thicken from the center line of the tuyeres downwards and form a whole with the deposits at the bottom of the furnace, which makes the overall brick lining erosion of the hearth shrink (common blast furnace The hearth brick lining erosion form is diffuse), in this case, the monitoring results of brick lining erosion and thickness on the furnace wall or furnace bottom will be distorted. Consequences of iron production or increased erosion to other locations

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