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Furnace wall structure of molten metal container and furnace wall construction method of molten metal container

A technology of molten metal and construction method, which is applied in the field of furnace wall structure of molten metal container and furnace wall construction of molten metal container, to achieve the effects of improving melting resistance, improving thermal conductivity coefficient, and reducing thermal expansion difference

Active Publication Date: 2015-09-02
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, if a predetermined number of decarburization treatments are performed, the remaining thickness of the furnace wall will be reduced due to loss of the refractory material, so the life of the furnace wall has a limit, and it is necessary to repair the furnace by stopping the converter and installing a new refractory material.

Method used

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  • Furnace wall structure of molten metal container and furnace wall construction method of molten metal container
  • Furnace wall structure of molten metal container and furnace wall construction method of molten metal container
  • Furnace wall structure of molten metal container and furnace wall construction method of molten metal container

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Embodiment

[0070] Next, examples performed for confirming the effects of the present embodiment will be described.

[0071] Here, actual machine investigations were conducted using a converter A having a furnace wall structure provided with the heat insulating material 14 and a converter B having a furnace wall structure not provided with the heat insulating material 14 .

[0072] Specifically, in the converter A, the furnace wall structure provided with the heat insulating material 14 is formed as follows: on the inside of the iron sheet 16 of the converter 12, magnesia permanent bricks ( Thickness: 65-230 mm), heat insulating material 14 and magnesia-carbon wear brick (thickness: 720-990 mm) as the magnesia-carbon brick 10 . Examples 1-5 and Comparative Examples 1-6 showed the result.

[0073] On the other hand, in the converter B, the furnace wall structure without the heat insulating material 14 is formed as follows: inside the iron sheet 16, magnesia-based permanent bricks (thickne...

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Abstract

This furnace wall structure of a molten metal container contains a heat insulation material which exhibits a thermal conductivity of 0.01 to 0.15 W / (m·K) in a temperature range of 25 to 300°C and which has a melting point of 1000 to 1400°C and a thickness of 2 to 10mm in a position in the longitudinal section view, said position being within a thicknesswise region of 0.75×T to 0.92×T (mm) from the inside surface of a magnesia / carbon refractory toward a steel shell. T is the thickness of the furnace wall exclusive of the steel shell.

Description

technical field [0001] The invention relates to the furnace wall structure of molten metal containers (such as converters, molten iron tanks, steel liquid tanks, electric furnaces, etc.) and the furnace wall construction method of molten metal containers. Background technique [0002] The converter, which is a vessel for molten metal, is used in a high-temperature environment because oxygen blowing is performed, and frequent repairs of refractory materials used in the furnace wall of the converter cannot be performed. Therefore, high durability (melting resistance, wear resistance, peeling resistance) is required for refractory materials, and its thickness is usually about 900 mm. As this refractory material, magnesia-carbon bricks (MgO—C bricks) are generally used. The magnesia-carbon brick has excellent refractoriness at high temperature because it contains magnesia, and at the same time maintains a certain thermal conductivity because it contains carbon, and has excellen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D1/00C04B35/043
CPCC04B35/013C21C5/44C04B2235/425C04B2235/9607C04B2235/72C04B35/043C04B2235/424F27D1/0006
Inventor 梅田真悟岸上公久近藤正章里吉泰德
Owner NIPPON STEEL CORP
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