CN100516249C - Method for improving life of roller hearth heating furnace roller heat-insulating material - Google Patents
Method for improving life of roller hearth heating furnace roller heat-insulating material Download PDFInfo
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- CN100516249C CN100516249C CNB2007101813682A CN200710181368A CN100516249C CN 100516249 C CN100516249 C CN 100516249C CN B2007101813682 A CNB2007101813682 A CN B2007101813682A CN 200710181368 A CN200710181368 A CN 200710181368A CN 100516249 C CN100516249 C CN 100516249C
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- furnace roller
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 title claims description 9
- 239000011810 insulating material Substances 0.000 title claims description 4
- 239000000835 fiber Substances 0.000 claims abstract description 32
- 239000000919 ceramic Substances 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000004570 mortar (masonry) Substances 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 5
- 239000011226 reinforced ceramic Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 230000009970 fire resistant effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 22
- 239000011819 refractory material Substances 0.000 abstract description 14
- 238000009413 insulation Methods 0.000 abstract description 8
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 238000009749 continuous casting Methods 0.000 description 5
- 238000004321 preservation Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Tunnel Furnaces (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention relates to a method prolonging the service life of the insulated material of the roller of roller hearth furnace, adopting the structure of composite lightweight refractory, which comprises a ceramic fiber rug, a ceramic fiber line, a high-temperature refractory daub and a heat-resistant anchor nail. The method is characterized in that the high intensity, excellent vibration resistance of heavy refractory material is combined with the outstanding insulated performance of lightweight refractory. When the method is applied to the armor plate rotated in high-speed to transport the water-cooling furnace roller in the condition of high temperature, the furnace not only has high temperature-resistant, obstructing the heat transfer to the system of water-cooling and reducing the waste of energy, but also withstands the violent vibrancy produced when a slab strikes the roller. Therefore, the method has the advantages of excellent performance of vibration resistance and insulation, long service life, convenient and prompt manufacture and low cost.
Description
Technical Field
The invention relates to the field of manufacturing of furnace roller heat insulation materials, in particular to a method for manufacturing and installing a heat insulation material of a furnace roller of a roller hearth type heating furnace used in a thin slab continuous casting and rolling production line.
Background
The thin slab continuous casting and rolling production line is the hot-rolled wide strip production technology in the 90 s of the 20 th century, and at present, more than 20 production lines of the type exist in China. The roller hearth furnace, one of the important components of the production line, has the functions of heating and soaking the continuous casting slab and conveying the slab to a rolling mill, and the furnace rollers in the furnace are important equipment for completing slab conveying. The temperature in the heating furnace is up to 1200 ℃, and in order to ensure that the furnace roller can normally work in a high-temperature environment, the part of the furnace roller in the furnace is coated with refractory materials to protect the furnace roller. When the refractory material drops, the furnace roller is easy to deform in the high-temperature environment in the furnace, the service life of the furnace roller is directly influenced, and meanwhile, the product quality is influenced.
The reason for causing the falling of the refractory material of the furnace roller mainly comprises two aspects: firstly, in a high-temperature environment, the refractory material cracks and gradually falls off due to self reasons; on the other hand, because the slab is heavy, the slab can generate large vibration when passing through the furnace roller quickly, and the refractory on the furnace roller is shaken off. In order to ensure the service life of the furnace roller refractory of the heating furnace, the current main furnace roller refractory manufacturing and construction method comprises the following steps:
(1) fiber spraying manufacturing method
The method is that a high temperature resistant fiber rope is fixed on the surface of a position needing to be protected of a furnace roller, and then the furnace roller is rotated while zirconium-containing high temperature resistant fiber is evenly sprayed on the furnace roller by a special spraying machine, so that the sprayed fiber and the fiber rope are interwoven as much as possible. After the construction is finished, the furnace roller is placed into a baking furnace for drying and then can be used. The manufacturing method has the advantages that: convenient and fast, the cost is low relatively, and the refractory material thermal insulation performance of the furnace roller is better, can reduce the heat that the furnace roller cooling water took away to minimum. The disadvantages are that: the shock resistance of the furnace roller refractory is poor, so that the average service life of the furnace roller refractory is less than 3 months.
(2) Preparation method of castable
The method is that the part of the furnace roller needing to be protected is sleeved with a pre-manufactured mould, and then the heavy castable is poured into the mould. After the mixture is coagulated and formed, the furnace roller is placed into a baking furnace for drying and then can be used. The manufacturing method has the advantages that: the refractory material of the furnace roller has good anti-seismic performance, and the average service life of the furnace roller can be as long as 1 year. The disadvantages are that: the manufacture is complicated and time-consuming and the cost is high. In addition, the heat insulation performance is poor due to large volume and high heat transfer speed, and the furnace roller cooling water can absorb a large amount of heat to cause energy waste when being used for protecting the furnace roller. Meanwhile, the weight is heavy, so that the load-bearing structure of the furnace body and the type selection of the furnace roller motor are influenced.
In a word, the two manufacturing methods can ensure longer service life, but the heat preservation performance is not good; or has good heat preservation performance but short service life.
Disclosure of Invention
The invention aims to provide a method for prolonging the service life of a heat-insulating material of a furnace roller of a roller-hearth heating furnace in a thin slab continuous casting and rolling production line. The method can better solve two main problems of short service life (less than or equal to 3 months) and poor heat preservation performance (the return water temperature of cooling water of the furnace roller is more than 50 ℃) of the refractory material of the furnace roller on a similar production line, which cause energy waste.
The background of the process flow adopted by the invention is as follows: a roller hearth type heating furnace for a thin slab continuous casting and rolling production line. The technical scheme is as follows:
firstly, welding 304 heat-resistant steel riveting nails with the diameter of 8 multiplied by 50mm on the water-cooling pipe wall between the furnace roller ring and the roller ring according to the distance of 100 plus 150 mm. Uniformly coating light refractory mortar on the wall of the water-cooled pipe, wrapping the furnace roller water-cooled pipe by using a ceramic fiber blanket with the thickness of 25mm, winding a phi 10-20mm heat-resistant steel wire reinforced ceramic fiber rope on the water-cooled pipe wrapped with the fiber blanket, and coating the refractory mortar while winding the rope. The gap between the ropes is about 1-2mm, so that the cement is adhered to the periphery of each rope, the fiber ropes are wound to a position 10mm below the surface of the roller ring, and a layer of refractory cement with the thickness of about 3mm is coated on the winding surface of each fiber rope. The well-constructed furnace roller is placed into a special baking furnace to be baked for not less than 8 hours at the temperature of 100-200 ℃.
The invention has the following technical characteristics:
1. the structure mainly takes the fiber blanket and the ceramic fiber rope, the volume weight is light, and the heat preservation and insulation effect is good;
2. the fireproof daub can still ensure good bonding strength in high-temperature and violent vibration environments, and is fully bonded with the fiber blanket and the ceramic fiber rope, so that the vibration resistance of the lightweight heat-insulating fireproof materials in high-temperature environments is greatly improved.
The invention has the advantages that:
the advantages of good heat insulation performance of the light heat insulation refractory material are fully exerted, and the characteristic of good mechanical vibration resistance of the refractory mortar is combined, so that the heat insulation performance of the refractory material of the furnace roller is ensured on the premise of prolonging the service life of the refractory material.
The practical demonstration proves that the average service life of the furnace roller refractory material adopting the technology can reach more than 8 months, is more than twice of that of the original fiber spraying method, and is close to the service life of the castable manufacturing method. But the heat preservation and heat insulation performance of the castable is far better than that of a castable manufacturing method. The data prove that the average backwater temperature of the furnace roller adopting the castable process is 65 ℃ and the average backwater temperature of the furnace roller adopting the technology is 45 ℃ on the premise that the furnace temperature is 1150 ℃. In addition, the method has simple and quick manufacturing process and lower manufacturing cost than the method for manufacturing the castable.
Drawings
FIG. 1 is a schematic sectional view of a refractory of a furnace roller;
FIG. 2 is a three-dimensional schematic view of a refractory material of a furnace roller;
fig. 3 is a schematic view of the anchor pin deployment.
FIG. 1 is a schematic sectional view showing a construction method of winding a ceramic fiber rope around a furnace roller;
fig. 2 shows a lightweight refractory structure based on ceramic fiber ropes. During construction, the heat-resistant steel rivet nails are welded according to the arrangement mode shown in the third figure, then the ceramic fiber ropes are wound among the roll collars, and the fireproof daub is smeared between the ropes while the ropes are wound. In order to enhance the anti-vibration capability of the refractory material, the heat-resistant steel wire is also wound while the rope is wound. Wherein,
firstly, a furnace roller collar;
the fifth technical scheme of the invention is described in the fifth point of the invention, wherein the refractory mortar is used for the surface and between the ropes;
thirdly, the gap of 2mm between the ropes described in the fourth point of the technical scheme in the invention content;
fourthly, the ceramic fiber rope is described in the third point of the technical scheme in the invention content;
the fifth step is the fiber blanket wrapped on the surface of the water-cooling pipe wall in the second point of the technical scheme in the invention;
sixthly, the heat-resistant steel rivet is described in the first point of the technical scheme in the invention.
And the water-cooling hollow part of the furnace roller is described in the third point of the technical scheme in the invention.
The specific implementation mode is as follows:
1. as shown in fig. 1 and fig. 3, a 304 heat-resistant steel rivet with the diameter of 8 mm multiplied by 50mm is welded on the wall of a water-cooling pipe between a furnace roller ring I and the roller ring I at the interval of 100 mm and 150 mm;
2. as shown in fig. 1, light refractory mortar is uniformly coated on the wall of the water-cooled tube, and then the water-cooled tube of the furnace roller is wrapped by a ceramic fiber blanket with the thickness of 25 mm;
3. as shown in fig. 1 and 2, a phi 10-20mm heat-resistant steel wire reinforced ceramic fiber rope is wound on a water-cooling pipe (c) wrapped with a fiber blanket (c);
4. as shown in fig. 1 and 2, the fireproof daub is coated while the rope is wound, and the gap between the rope and the rope is 1-2mm, so that the daub is adhered to the periphery of the rope;
5. as shown in fig. 1 and fig. 2, a fiber rope (r) is wound to a position 10mm below the surface of the roll collar, and a layer of refractory mortar with the thickness of 3mm is smeared on the wound surface of the fiber rope (r);
6. the well-constructed furnace roller is placed into a special baking furnace to be baked for not less than 8 hours at the temperature of 100-200 ℃. Then the soaking furnace can be filled in the soaking furnace for use.
Claims (1)
1. A method for prolonging the service life of a furnace roller heat-insulating material of a roller hearth heating furnace is characterized by comprising the following steps: the fire-resistant daub bonds the cordage as an organic whole to fix on high-speed pivoted stove roller through heat-resistant steel rivet nail, specific construction steps are:
step 1: welding heat-resistant steel rivet nails on the water-cooling pipe wall between the furnace roller ring and the roller ring at the interval of 100 plus 150 mm;
step 2: uniformly coating light refractory mortar on the wall of the water-cooled tube, and then wrapping the furnace roller water-cooled tube by using a ceramic fiber blanket with the thickness of 25 mm;
and step 3: winding a heat-resistant steel wire reinforced ceramic fiber rope with the diameter of 10-20mm on a water-cooled tube wrapped with a fiber blanket, coating refractory mortar while winding the rope, wherein the gap between the ropes is 1-2mm to ensure that the mortar is adhered to the periphery of the rope;
and 4, step 4: winding the fiber rope to a position 10mm below the surface of the roller ring, and then coating a layer of refractory mortar with the thickness of 3mm on the winding surface of the fiber rope;
and 5: the well-constructed furnace roller is placed into a baking furnace to be baked for not less than 8 hours at the temperature of 100-200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101813682A CN100516249C (en) | 2007-10-20 | 2007-10-20 | Method for improving life of roller hearth heating furnace roller heat-insulating material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101813682A CN100516249C (en) | 2007-10-20 | 2007-10-20 | Method for improving life of roller hearth heating furnace roller heat-insulating material |
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| Publication Number | Publication Date |
|---|---|
| CN101157976A CN101157976A (en) | 2008-04-09 |
| CN100516249C true CN100516249C (en) | 2009-07-22 |
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| CNB2007101813682A Active CN100516249C (en) | 2007-10-20 | 2007-10-20 | Method for improving life of roller hearth heating furnace roller heat-insulating material |
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| CN108993029B (en) * | 2018-08-10 | 2021-03-12 | 山东鲁阳节能材料股份有限公司 | Preparation method of high-temperature dust removal filter tube |
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2007
- 2007-10-20 CN CNB2007101813682A patent/CN100516249C/en active Active
Non-Patent Citations (6)
| Title |
|---|
| CSP加热炉炉辊辊环的研制. 冯立义等.包钢科技，第30卷第2期. 2004 |
| CSP加热炉炉辊辊环的研制. 冯立义等.包钢科技，第30卷第2期. 2004 * |
| 耐热钢纤维增强耐火浇注料炉辊. 刘岫云等.工业炉，第总第79期. 1996 |
| 耐热钢纤维增强耐火浇注料炉辊. 刘岫云等.工业炉，第总第79期. 1996 * |
| 陶瓷纤维在包钢CSP加热炉上的应用. 李京文等.包钢科技，第30卷第2期. 2004 |
| 陶瓷纤维在包钢CSP加热炉上的应用. 李京文等.包钢科技，第30卷第2期. 2004 * |
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| CN101157976A (en) | 2008-04-09 |
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Address after: Hong Shan Xiang Yang Zhong Cun 471037 Xigong District Henan city of Luoyang province Luoyang Kechuang new materials Limited by Share Ltd Patentee after: LUOYANG KECHUANG NEW MATERIAL CO., LTD. Patentee after: Zhujiang Iron and Steel Co., Ltd., Guangzhou Address before: 471037 Henan province Luoyang Xigong Hongshan Patentee before: Luoyang Kechuang Refractories Co., Ltd. Patentee before: Zhujiang Iron and Steel Co., Ltd., Guangzhou |