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Furnace beam and vertical column fire-resistant thermal insulation lining structure of walking beam furnace for heating high-temperature oriented silicon steel and manufacturing method of structure

A technology of walking heating furnace and oriented silicon steel, which is applied in the field of heating furnace, can solve the problems of rising maintenance cost, lowering surface temperature, destroying the integrity of heat insulation lining, etc., to improve high temperature oxidation resistance, buffer thermal expansion performance difference, The effect of prolonging the effective time of action

Inactive Publication Date: 2014-12-10
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual production and application process, for the heating of ordinary steel types, due to the low heating temperature and short furnace time, the steel billet is less oxidized, and the oxide is solid oxide scale, which can extend the use of the heat insulation lining of the furnace beam and column of the heating furnace. However, for the heating of high-temperature oriented silicon steel, due to the high heating temperature and long time in the furnace, the billet is severely oxidized, and the oxides are molten oxides, resulting in a large amount of sticky slag and slag columns hanging on the surface of the furnace beam and column insulation lining In the end, the furnace was forced to stop the furnace for slag removal because it could not meet the heating quality requirements of high-temperature oriented silicon steel. At the same time, the harsh heating conditions also promoted the damage of the furnace beam and column insulation lining. The mechanical damage of the thermal insulation lining of the column leads to a short service life of the furnace beam and the column, a sharp increase in maintenance costs, and a significant drop in the efficiency of the heating furnace
According to the analysis, for the conventional furnace beam and column heat insulation lining structure and materials, because the outer castable is easily infiltrated and eroded by the high-temperature oriented silicon steel oxidized melt, resulting in slag sticking to the furnace beam and column, due to the high density and high thermal conductivity of the castable 1. The thickness of the pouring layer affects the overall thermal insulation performance of the heat insulation lining, reduces the surface temperature of the heat insulation lining, and causes the oxidized melt formed during the heating process of the high-temperature oriented silicon steel to condense, stick and slag on the surface of the furnace beam and column heat insulation lining. In addition, due to the high-temperature shrinkage of the refractory fiber blanket and the thermal expansion of the refractory castable, a gap is formed between the outer layer of the castable and the refractory fiber blanket layer, which destroys the integrity of the heat-insulating lining and easily causes the Y-shaped anchor to be exposed to high temperature. Oxidation and thermal shock cracking and structural peeling of the refractory castable layer not only affect the heat insulation effect of the furnace beam and column insulation lining, but also cause high cooling heat loss of the furnace beam and column, lower surface temperature, and further aggravate slag hanging
[0004] Based on the above, the existing walking heating furnace, beam and column insulation lining technology is difficult to meet the performance requirements of high-temperature oriented silicon steel (HiB steel) high-quality, high-efficiency, and low-cost heating. It is necessary to further develop the walking heating furnace beam Research on the thermal insulation lining structure of the furnace beam and column, improve the thermal insulation performance and damage resistance of the furnace beam and column refractory thermal insulation lining, curb the slag hanging process of the furnace beam and column, reduce the energy consumption of the heating furnace, and extend the furnace beam and column Comprehensive goals such as the service life of refractory and heat-insulating linings, reducing the amount of slag hanging, reducing the maintenance cost of heating furnaces, and improving the heating production efficiency of high-temperature oriented silicon steel

Method used

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  • Furnace beam and vertical column fire-resistant thermal insulation lining structure of walking beam furnace for heating high-temperature oriented silicon steel and manufacturing method of structure
  • Furnace beam and vertical column fire-resistant thermal insulation lining structure of walking beam furnace for heating high-temperature oriented silicon steel and manufacturing method of structure
  • Furnace beam and vertical column fire-resistant thermal insulation lining structure of walking beam furnace for heating high-temperature oriented silicon steel and manufacturing method of structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A walking-type heating furnace beam and column refractory and heat-insulating lining structure for heating high-temperature oriented silicon steel, including metal tubes 5 forming the foundation of the furnace beam or column, wherein the metal tubes 5 forming the foundation of the furnace beam are arranged at intervals along the axial direction. The heat-resistant spacer 4, the outer wall of the metal pipe 5 is evenly distributed with metal anchors 3 along the axial and circumferential directions, and the outer wall of the metal pipe 5 is poured with a fire-resistant insulation layer 1 integrated with the metal anchor 3, and the fire-resistant insulation layer 1 The outside is also covered with an anti-slag layer 2 and an anti-oxidation coating 6 in sequence.

[0060] The metal anchor 3 has a V-shaped structure, its diameter is 6-8 mm, and its top is 5-10 mm away from the outer surface of the refractory insulation layer 1; the heat-resistant pad 4 is 20-40 mm higher than...

Embodiment 2

[0069] In this example, the structure of the refractory and heat-insulating lining of the walking-type heating furnace for heating high-temperature oriented silicon steel is the same as that of Example 1, except that:

[0070] Lightweight and high-strength heat-insulating refractory castable, its raw materials include by weight percentage:

[0071] 35% lightweight mullite aggregate, 10% aluminum-rich spinel hollow spheres, 5% andalusite, 8.75% aluminum-rich spinel powder, 5% kyanite powder, 8% silica powder, 10% ρ-Al 2 o 3 Micropowder, 12% pure calcium aluminate cement, 6% refractory fiber, 0.05% sodium hexametaphosphate, 0.15% FS20 refractory castable water reducing agent, 0.04% water-soluble WD-10 silane coupling agent and 0.01 % defoamer.

[0072] Wherein, the Al of the lightweight mullite aggregate 2 o 3 Content≥60%, bulk density of 1~5mm particles≤1.0g / cm 3 , consisting of two particle gradations with a particle size greater than 3mm and less than or equal to 5mm and ...

Embodiment 3

[0078] In this example, the structure of the refractory and heat-insulating lining of the walking-type heating furnace for heating high-temperature oriented silicon steel is the same as that of Example 1, except that:

[0079] A light-weight high-strength heat-insulating refractory castable, its raw materials include by weight percentage:

[0080] 35% lightweight mullite aggregate, 10% aluminum-rich spinel hollow spheres, 8% andalusite, 5% aluminum-rich spinel powder, 6% kyanite powder, 7% silica powder, 8% ρ-Al 2 o 3 Micropowder, 16% pure calcium aluminate cement, 4.74% refractory fiber, 0.1% sodium hexametaphosphate, 0.1% FS20 refractory castable water reducer, 0.045% water-soluble WD-10 silane coupling agent and 0.015 % defoamer.

[0081] Wherein, the Al of the lightweight mullite aggregate 2 o 3 Content≥60%, bulk density of 1~5mm particles≤1.0g / cm 3 , composed of particle gradation with a particle size of 1~3mm, the particle size of the alumina-rich spinel hollow sph...

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Abstract

The invention discloses a furnace beam and vertical column fire-resistant thermal insulation lining structure of a walking beam furnace for heating high-temperature oriented silicon steel. The furnace beam and vertical column fire-resistant thermal insulation lining structure comprises a metal pipe forming a foundation of a furnace beam or a vertical column, wherein heat-resistant cushion blocks are arranged on the metal pipe forming the foundation of the furnace beam at intervals along the axis direction, metal anchoring parts are uniformly distributed on the outer wall of the metal pipe along the axial direction and the peripheral direction, a fire-resistant insulating layer is formed to cling to the outer wall of the metal pipe in a pouring manner and is combined with the metal anchoring parts, and the fire-resistant insulating layer is sequentially covered by a slag-bonding prevention layer and an anti-oxidation coating. As the heat preservation and slag-bonding prevention double-layer structure and the design of appropriate thickness are adopted by the furnace beam and vertical column fire-resistant thermal insulation lining structure of the walking beam furnace, the integrality of a thermal insulation lining is improved, and the comprehensive usability of the thermal insulation lining is improved.

Description

technical field [0001] The invention belongs to the field of heating furnaces, in particular to a walking-type heating furnace beam and column refractory and heat-insulating lining structure for heating high-temperature oriented silicon steel and a preparation method thereof. technical background [0002] High-temperature oriented silicon steel has high magnetic induction and low iron loss performance and has been unanimously recognized by users. However, in the production process of high-temperature oriented silicon steel (HiB steel), the heating temperature of the billet in the walking heating furnace is high and the time in the furnace is long, resulting in the billet There is a large amount of oxidation burning loss in the furnace, and the melt formed by the oxidation of iron and silicon on the surface of the billet flows continuously to the surface of the supporting furnace beam and column and the bottom of the furnace. Among them, the molten material flowing to the supp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/00
Inventor 欧阳德刚徐国涛蒋扬虎丁翠娇
Owner 武汉钢铁有限公司
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