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Application method of polycrystalline mullite on heating furnace

A technology of polycrystalline mullite and an application method is applied in the application field of polycrystalline mullite fiber as a wrapping material for a bottom water pipe of a steel rolling heating furnace, and can solve the problems affecting the surface quality of steel products, poor heat absorption effect on the steel surface, and wrapping The problem of large block size, etc., achieves the effect of convenient and fast installation, extended service life and improved heating quality

Active Publication Date: 2009-06-03
NANJING NANGANG IND DEV CO LTD
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  • Summary
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AI Technical Summary

Problems solved by technology

The furnace bottom water pipes include vertical water pipes, horizontal water pipes, and supporting water pipes. The heat protection of all water pipes adopts refractory wrapping technology. The commonly used refractory wrapping materials are integral pouring of self-flowing castables. The thickness of the material is too large, the volume of the binding block is large, and it occupies a large space, which causes the steel billet to contact the vertical water pipe. During the heating process of the steel, the heat radiation to the steel surface is affected, and the heat absorption effect of the steel surface is poor. The main reason for printing, which in turn affects the improvement of the surface quality of steel products

Method used

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Embodiment 1

[0018] The application method of polycrystalline mullite in the heating furnace of the medium-sized plant of Nanjing Iron and Steel Co., Ltd.: a high-efficiency and energy-saving regenerative gas-fired heating furnace transformed from the traditional three-stage continuous steel-pushing oil-fired heating furnace, and the fuel is pure blast furnace gas.

[0019] First, clean and derust the water pipes of the heating furnace: including horizontal water pipes, vertical water pipes and supporting water pipes, and clean and derust the surface;

[0020] Weld the anchor nails on the surface of the water pipe at the bottom of the heating furnace; the material of the anchor nails is Φ3.2~4.0×30Q235-A or stainless steel;

[0021] Apply high temperature glue on the surface of polycrystalline mullite dressing block; the composition of high temperature glue is that high temperature glue and high temperature refractory mud are mixed at 1:1, wherein the high temperature glue is composed of ph...

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Abstract

The inventive method of applying the polycrystalline mullite on heating furnaces includes the following steps of welding anchors on the waterpipe surface at the bottom of the heating furnace; coating high-temp. adhesive on the surface of the polycrystalline mullite pack block; fixing the polycrystalline mullite pack block coated with high-temp. adhesive on the anchor and sticking it on the waterpipe surface. Before each step said above, the rust-cleaning of the heating furnace waterpipe must be done.

Description

technical field [0001] The invention belongs to the technical field of application of refractory materials in iron and steel metallurgy, and relates to an application method of polycrystalline mullite on a heating furnace, in particular to an application method of polycrystalline mullite fiber as a wrapping material for a furnace bottom water pipe of a steel rolling heating furnace. Background technique [0002] For heating furnaces used in rolling mills of iron and steel enterprises, the furnace bottom water pipes are mostly cooled by natural circulation vaporization. The furnace bottom water pipes include vertical water pipes, horizontal water pipes, and supporting water pipes. The heat protection of all water pipes adopts refractory wrapping technology. The commonly used refractory wrapping materials are integral pouring of self-flowing castables. The thickness of the material is too large, the volume of the binding block is large, and it occupies a large space, which cau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D1/12
Inventor 朱庆福饶骁睿吴旭春
Owner NANJING NANGANG IND DEV CO LTD
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