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Method for reducing material surface smog through stock level lowering and spraying in blast furnace

A technology of reducing material line and material surface, applied in blast furnace, blast furnace details, furnace and other directions, to achieve the effect of being conducive to construction, clear vision and improving work efficiency

Active Publication Date: 2017-01-11
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Application Information

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Problems solved by technology

[0003] The present invention is aimed at the technical problems existing in the prior art, and provides a method for reducing the smoke on the material surface by spraying the blast furnace lowering line. A series of methods such as opening holes in the furnace body area have successfully solved the problem that the smoke on the material surface after the lowering line affects the construction

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  • Method for reducing material surface smog through stock level lowering and spraying in blast furnace

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Embodiment 1

[0012] Example 1 : a method for spraying and reducing the smog on the material surface of a blast furnace lowering line. The wind material is loaded into the blast furnace strictly according to the off-air material plan, which is not only beneficial to the construction, but also conducive to the resumption of production of the blast furnace. Dolomite is a compound salt of calcium carbonate and magnesium carbonate with the molecular formula CaMg(CO 3 ) 2 , the decomposition equations of pure calcium carbonate and magnesium carbonate are:

[0013] CaCO 3 = CaO + CO 2

[0014] MgCO 3 =MgO+ CO 2

[0015] The decomposition boiling temperature of pure calcium carbonate is 910°C, and the decomposition boiling temperature of pure magnesium carbonate is 640°C. And dolomite is a composite carbonate, MgCO with low decomposition temperature in the composite salt when heated 3 compared to CaCO 3 Decomposes first, MgCO between 700°C and 900°C 3 and CaCO 3 All disassembled. ...

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Abstract

The invention relates to a method for reducing material surface smog through stock level lowering and spraying in a blast furnace. The method comprises the following steps: 1) a blowing-down burden material is prepared in a reasonable mode, dolomite is added in front 4 stages material of the blowing-down burden material, but no dolomite is added in the post 3 stages material; 2) after blast furnace staying, the material surface is covered with a layer of blast furnace slag with thickness of 500 millimeters; and 3) after the addition of the slag is finished, four holes are opened at four directions on the furnace scale over the material surface with 1.5 meters, air is absorbed from the four holes, and an air cross-ventilation principle is used for rapidly blowing the smog. By preparing the blowing-down burden material in a scientific mode, adding the blast furnace slag in the reasonable mode, and opening on a furnace shell area over the material surface, the problem of construction influenced by the smog of the material surface after dropping stock line can be successfully solved.

Description

technical field [0001] The invention relates to a method for reducing smog on a material surface by spraying on a material lowering line of a blast furnace, and belongs to the technical field of ironmaking technology. Background technique [0002] The blast furnace is a smelting equipment that has been in continuous high-temperature production for a long time. The product is molten iron, and the by-products are blast furnace slag and blast furnace gas. The molten iron and blast furnace slag are discharged from the tap hole and separated outside the blast furnace. During the long-term operation, the lining of the blast furnace is eroded and peeled off, causing partial or large area damage, which in turn damages the cooling wall of the blast furnace, resulting in deformation of the furnace skin, redness and gas leakage, affecting the normal operation of the blast furnace. In order to achieve the purpose of long life and high efficiency of the blast furnace, the method of re-l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 杨文光王书龙
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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