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A kind of protective curing coating for the surface of fiber furnace lining of cold rolling continuous annealing furnace

A continuous annealing furnace and fiber furnace lining technology, which is applied in the field of refractory curing coatings for industrial kilns, can solve the problems of unsatisfactory requirements and high investment, and achieve improved heat insulation effect, reduced heat loss, and improved mechanical properties and thermal shock stability. Effect

Active Publication Date: 2022-01-11
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, due to the current high investment in high-end polycrystalline alumina fiber, the price per ton exceeds 600,000 yuan
[0006] From the above analysis, it can be seen that although a lot of research has been done at home and abroad on the protection technology of the working hot surface of the fiber lining of the cold-rolled continuous annealing furnace, there are still deficiencies in actual production, which cannot meet the requirements of the cold-rolled continuous annealing furnace lining under the new situation. Therefore, it is necessary to further carry out research on the protection technology of the fiber lining of the cold-rolled continuous annealing furnace, in order to find a more suitable protection method for the fiber lining structure

Method used

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  • A kind of protective curing coating for the surface of fiber furnace lining of cold rolling continuous annealing furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]A protective and cured coating for the surface of the fiber lining of a cold-rolled continuous annealing furnace. Beads: 20%, active Al with particle size ≤10μm 2 o 3 Powder: 5%, fumed silica with particle size ≤ 40 nm: 5%, zirconium-containing aluminum silicate fiber segment with diameter ≤ 10μm, length ≤ 1mm: 2%, magnesium oxide active powder with particle size ≤ 10μm: 8%, inorganic Composite adhesive: 30%.

[0031] Inorganic composite adhesive composition and weight percentage content: sodium tripolyphosphate: 15.5%, containing SiO 2 20% by weight silica sol: 84.5%.

[0032] After coating on the applicant's cold-rolled continuous annealing furnace fiber furnace lining surface, the bulk density of its coating is at 0.84g / cm 3 , the flexural strength is 2.3 MPa, the thermal conductivity at 900°C is 0.26 w / m K, and the anti-airflow erosion velocity is 42 m / s.

[0033] And after 12 months of use testing, after testing, the phenomenon of furnace gas scouring in the fu...

Embodiment 2

[0035] A protective and cured coating for the surface of the fiber lining of a cold-rolled continuous annealing furnace. Beads: 10%, active Al with particle size ≤10μm 2 o 3 Powder: 5%, fumed silica with particle size ≤ 40 nm: 5%, zirconium-containing aluminum silicate fiber segment with diameter ≤ 10μm, length ≤ 1mm: 2%, magnesium oxide active powder with particle size ≤ 10μm: 10%, inorganic Composite adhesive: 38%.

[0036] Inorganic composite adhesive composition and weight percentage content: sodium tripolyphosphate: 15%, containing SiO 2 21% by weight silica sol: 85%.

[0037] After coating on the applicant's cold-rolled continuous annealing furnace fiber lining surface, the bulk density of its coating is 0.98g / cm 3 , the flexural strength is 1.5 MPa, the thermal conductivity at 900°C is 0.45 w / m·K, and the anti-airflow erosion speed is 40 m / s.

[0038] And after 12 months of use testing, the phenomenon of being scoured by furnace gas in the furnace is light, and it ...

Embodiment 3

[0040] A protective curing coating for the surface of the fiber lining of a cold-rolled continuous annealing furnace. Beads: 15%, active Al with particle size ≤10μm 2 o 3 Powder: 4%, fumed silica with particle size ≤ 40 nm: 6%, zirconium-containing aluminum silicate fiber segment with diameter ≤ 10μm, length ≤ 1mm: 3%, magnesium oxide active powder with particle size ≤ 10μm: 7%, inorganic Composite adhesive: 30%.

[0041] Inorganic composite adhesive composition and weight percentage content: sodium tripolyphosphate: 18%, containing SiO 2 21% by weight silica sol: 82%.

[0042] After coating on the applicant's cold-rolled continuous annealing furnace fiber furnace lining surface, the bulk density of its coating is at 0.93g / cm 3 , the flexural strength is 2.9 MPa, the thermal conductivity at 900°C is 0.36 w / m·K, and the anti-airflow erosion speed is 41.5m / s.

[0043] After 18 months of use and testing, the phenomenon of being scoured by furnace gas in the furnace is light,...

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Abstract

A protective and cured coating for the surface of the fiber lining of cold-rolled continuous annealing furnaces. The raw material composition and wt% are: zirconium-containing aluminum silicate powder with a particle size of ≤10 μm: 30-40%, light-weight bleach with a particle size of 100-300 μm Beads: 10~20%, active Al with particle size ≤10μm 2 o 3 Powder: 2~6%, fumed silica with particle size ≤40 nm: 2~6%, aluminum silicate fiber segment containing zirconium: 1~4%, magnesium oxide active powder with particle size ≤10μm: 5~10%, inorganic Composite adhesive: 30~40%. The invention can withstand high temperature of 1000°C, has high surface hardness, high bonding strength with the furnace lining interface, can resist the scouring ability of furnace gas at 40-45 m / s, has good thermal shock stability, and can effectively reduce the scattering of fiber peelings. To ensure the cleanliness of the continuous annealing furnace, it can directly block the local thermal bridges that exist in the traditional steel plate protection of the fiber lining and reduce the heat dissipation loss of the lining.

Description

technical field [0001] The invention relates to a refractory cured paint for an industrial furnace, in particular to a protective cured paint for a continuous annealing furnace fiber furnace lining high-temperature working surface. Background technique [0002] At present, the lining of cold rolling continuous annealing furnace generally adopts ceramic fiber layer carpet + stainless steel protective structure, and the refractory fiber forms a whole with the protective steel plate and steel shell through metal anchors. Although the stainless steel protective lining has a good protective effect on the ceramic fiber furnace lining, ensuring that it is not damaged, the fiber stripping is scattered and the environment in the furnace is clean, but the stainless steel lining must generally be processed in the factory in advance according to the part design drawing. Installation and assembly are carried out in a certain order on site, and when welding the surface of the furnace lini...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3206C04B2235/3217C04B2235/3418C04B2235/5228
Inventor 杜贤武丁翠娇李源宋中华田大鹏杨超
Owner 武汉钢铁有限公司
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