CN102251066B - Cooling wall with pre-coated slag crust - Google Patents
Cooling wall with pre-coated slag crust Download PDFInfo
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- CN102251066B CN102251066B CN201010175376.8A CN201010175376A CN102251066B CN 102251066 B CN102251066 B CN 102251066B CN 201010175376 A CN201010175376 A CN 201010175376A CN 102251066 B CN102251066 B CN 102251066B
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Abstract
The invention relates to a cooling wall with a pre-coated slag crust. The cooling wall comprises a cooling water pipe, a cooling wall metal body and a pre-coated slag crust material covering the inner wall of the metal cooling wall, and is characterized in that: the cooling wall metal body can be a cast iron cooling wall, cast steel cooling wall or copper cooling wall; the pre-coated slag crust material is an artificially synthesized slag crust material and is prepared from a refractory material, calcium silicate powder and metal steel fibers in a certain ratio; and the steel fiber content is 15 to 40 weight percent and 20 to 40 volume percent of the pre-coated slag crust material, so the wear resistance and strength are high, and a dovetail groove cannot be broken; therefore, the pre-coated slag crust material can stably cover the cooling wall for a long time, namely a layer of permanent pre-coated slag is formed on the cooling wall.
Description
Technical field
The present invention relates to blast furnace cooling stave, particularly relate to a kind of cooling stave of pre-hung slag crust.
Background technology
Blast furnace cooling stave is the important component part of furnace structure.
By material classification, cooling stave can be divided into cast-iron cooling wall, cast steel cooling wall, copper cooling wall and hot side with the composite structure cooling stave of copper huyashi-chuuka (cold chinese-style noodles) use steel etc. at present.Cooling stave towards the surface of blast furnace inner side, have light face, tongue and groove, also have other structure formations, but main or tongue and groove structure is main.The effect of tongue and groove is to be convenient to inlay refractory materials protective layer and to be convenient to after refractory materials is worn form dross protective layer on cooling stave surface.
The refractory brick that is embedded in cooling stave surface can effectively protect cooling stave not worn and torn by furnace charge, also in furnace wall, forms one thermal resistance simultaneously to reduce furnace wall radiation energy consumption.But the refractory materials on cooling stave surface environment for use of living in is very harsh, it wants under the condition of high temperature, to bear the erosion of slag for a long time, the thermal shocking of the washing away of the wearing and tearing of furnace charge, rising Gas Flow, temperature variation etc., thereby general some months or just progressively worn and torn or wash away slightly for a long time.The refractory materials reason washing away that is worn is mainly that refractory materials is generally hard brittle material, and the significant shear power at dovetail-indent place is easy to cause the fracture of root of edge brick, thereby causes the even integral body that comes off of refractory materials protective layer to collapse.
There is no the protection of refractory materials, will come out and directly contact washing away and erosion of high-temp. furnace material and furnace gas in cooling stave surface.Meanwhile, owing to there is no the heat insulation of refractory masses, in cooling stave, water coolant can be taken away amount of heat, causes scattering and disappearing of amount of heat, shows as high coke ratio and the high energy consumption of production.
Fusion zone at blast furnace; after cooling stave refractory materials is washed; slag can bond to and on furnace wall, form a protective layer; the effect of slag protective layer is heat insulation equally and prevents that cooling stave surface is worn; but this slag crust and cooling stave is bonding insecure; can frequently come off, cause sometimes cooling stave local superheating, even burn indivedual cooling staves.
And generally seldom there is slag the middle and upper part of blast furnace, so after cooling stave refractory materials is worn, has been difficult to slag and adhered to, this will inevitably cause direct wearing and tearing and the thermal losses greatly of cooling stave metal construction.Due to the water-cooled tube of a lot of blast furnaces be upper and lower UNICOM single channel control, blast furnace may cause because middle and upper part cooling intensity is excessive the decline of overall operation efficiency.
In order to prevent the problems such as burning of high energy consumption and cooling stave; blast furnace generally all adopts regular inner-wall spraying spray repair or is pressed into makes liner repairing; object is all after inwall refractory materials is worn, and manages again on inwall, to construct the refractory materials protective layer that one deck is new.
But no matter be spray repair or be pressed into, the work-ing life of material is still very short, general half a year of liner of dry spraying or slightly come off for a long time.Therefore, blast furnace in using stove labour, in order to guarantee the normal operation of blast furnace, regular inner-wall spraying or to be pressed into be a kind of liner maintenance service of normality.And after inlaying resistance to material and damaging or after gunning material damages, can only look to cooling stave to adhere to adhering to one deck slag having come heat insulation and protection cooling stave.
Summary of the invention
Because the working condition in blast furnace is very severe, which kind of refractory materials cooling stave hot side no matter adopt, and its life-span can be not oversize.How on cooling stave surface, form stable slag crust protective layer, be only and solve energy Conservation of Blast Furnace and long-lived key.
Object of the present invention will be developed high strength, high heat conduction resistant to elevated temperatures cooling stave wall covering material exactly, and before cooling stave is installed blast furnace, by appropriate means, this material is fixed in the inner wall surface of cooling stave.This material can not cause because of the fracture at dovetail-indent place tectal collapsing, and its wear resisting property is fabulous, thereby can not fallen by quick-wearing very yet, thereby can be covered in for a long time on cooling stave hot side.After wall to be cooled is installed blast furnace, being equivalent to has had the permanent pre-hung slag of one deck on cooling stave inwall, plays protection cooling stave and heat-blocking action, and long-term safety existence, thereby reach, extends cooling stave and even the object of blast furnace campaign.
Concrete scheme of the present invention is: prefabricated one deck synthetic slag crust material on cast iron, cast steel or copper cooling wall inwall at inwall with dovetail-indent, this synthetic slag crust material is prepared by a certain percentage by refractory materials and Calucium Silicate powder powder and metal fiber.Refractory materials is mixed evenly by a certain percentage by alumina, corundum, silicon carbide, alumina powder, silicon ash and bonding agent, water reducer, and bonding agent is aluminate cement or phosphoric acid or aluminium dihydrogen phosphate etc.In this synthetic slag crust material, the content of steel fiber should reach 10%～20% by volume, and weight ratio should reach 15%～40%.Adding of Calucium Silicate powder powder is in order to guarantee that artificial slag crust more easily adheres to in-furnace slag in use.
Specific embodiment of the invention method is: first prepare above-mentioned prefabricated slag crust material blends (not comprising steel fiber in mixture), and it is standby to add tap water or liquid bonding agent (phosphoric acid or aluminium dihydrogen phosphate) that mixture is stirred into mud.Determine prefabricated slag crust layer thickness, generally can be defined as 50～200mm thick (not comprising depth of dovetail), then a top plate on cooling stave, is successively evenly sprinkled into cooling stave dovetail-indent and position, whole prefabricated slag crust space by metal fiber.After filling up steel fiber in dovetail-indent, inject above-mentioned mud.Because the flowing property of mud is fabulous, in the time of slip casting, also coordinate vibration template, the institute that slurry can fill up between steel fiber very is soon gapped.After injection body sclerosis to be poured, the demoulding is baked to 350 ℃.
Key problem in technology of the present invention is: the steel fiber that contains high volume fraction in prefabricated slag crust material, its shared volume fraction 10%～20%.Just because of containing a large amount of steel fibers in this prefabricated slag crust, (far above conventional steel fiber, strengthen the content of steel fiber in refractory castable, general steel fiber strengthens content of steel fiber in refractory castable by weight can not be higher than 5%, by volume can be higher than 2%), so this prefabricated slag crust has high thermal conductivity, therefore the temperature of whole slag crust layer self is not high, thereby guarantee that prefabricated slag crust layer material has high shearing resistance folding strength all the time, therefore can there is not the shear fracture of dovetail-indent interface in slag crust layer, also show as on the whole and there is high wear-resisting resistance to mechanical shock performance.
Key problem in technology of the present invention is also: in prefabricated slag crust material, contain Calucium Silicate powder powder, the object that adds of Calucium Silicate powder powder is to make prefabricated slag crust material more approach slag composition (blast furnace granulated slag composition is mainly Calucium Silicate powder mineral), thereby makes prefabricated slag crust more easily adhere to adhesion slag.
Pre-hung slag crust cooling stave cold junction body material of the present invention and flexible structure, cast-iron cooling wall, cast steel cooling wall or copper cooling wall all can, dovetail-indent or other structures that can bite or tangle pre-hung slag crust can.
The invention has the advantages that:
1, pre-hung slag crust cooling stave of the present invention had covered in advance the artificial slag crust material of one deck at hot side before building by laying bricks or stones; and this pre-hung slag crust layer material is because having high resistance folding high abrasion and high fire performance; so can be attached to steadily in the long term on cooling stave metallic surface; play protection cooling stave and heat-insulating and energy-saving effect, thus short life and the frequent maintenance maintenance problem of blast furnace inwall of having avoided furnace wall edge brick or spraying to repair liner.
2, owing to having added a large amount of steel fibers in pre-hung slag crust; its thermal conductivity is considerably beyond the existing refractory materials being embedded on cooling stave; simultaneously because be furnished with Calucium Silicate powder powder in pre-hung slag crust composition; even if therefore there is wearing and tearing attenuation in pre-hung slag crust material after life-time service; its uneven surface near one side of slag in stove also can be easy to condensation and adhere to slag protective layer, and this adheres to slag layer and is combined tight difficult drop-off with pre-hung slag layer.
3, different according to the position of blast furnace, in pre-hung slag crust material, refractory materials used can be according to environment for use adjustment, such as improving thermal conductivity by improving silicon carbide ratio, reduces Calucium Silicate powder consumption to improve the fire performance etc. of pre-hung slag crust material.
4, pre-hung slag crust cooling stave cold junction body material of the present invention and flexible structure, cast-iron cooling wall, cast steel cooling wall or copper cooling wall all can, dovetail-indent or other structures that can bite or tangle pre-hung slag crust can.
5, due to the long service life of pre-hung slag crust of the present invention, so the liner maintenance cost that operation of blast furnace is is few, and cooling stave heat radiation reduces, so the cooling stave comprehensive cost of pre-hung slag crust is low, once after investment, can forever use.
Accompanying drawing explanation
Accompanying drawing 1 is the typical vertical sectional view of pre-hung slag crust cooling stave.Wherein 1 is cooling-water duct, and 2 is metal cools wall, and 3 is pre-hung slag crust.The root of pre-hung slag crust is embedded in the dovetail-indent of metal cools wall, and by the interlock of dovetail-indent, guarantees that whole pre-hung slag crust fixedly secures on the inwall of metal cools wall.
Embodiment
Refractory materials batching: by weight, 30 parts of calcineds bauxite in powder, 50 parts of lapis amiridiss, 50 parts of carborundum powders, 10 parts of silicon powders, 15 parts of alumina powders, 15 parts of aluminous cements, 2 parts of water reducers.
15 parts of calcium silicate powder parts by weight.
Above-mentioned powder adds tap water, is stirred into the mud of good fluidity.
What a is prepared with the copper wall of dovetail-indent, according to the thickness of the slag crust 150mm (not comprising depth of dovetail) of design, using copper cooling wall as a side template, a good mould.In mould, dispense steel fiber, carefully dispense to guarantee that steel fiber volume accounts in mould all 15% of spatial volumes.
To filling in the mould of steel fiber, inject the above-mentioned mud being stirred.
The vibration of cooperation to mould, guarantees whole steel fiber gap to be full of above-mentioned mud.
At room temperature together with mould maintenance after at least 24 hours, above-mentioned pour mass hardens.
After the demoulding, continue maintenance 72 hours.
Slag crust is together with copper cooling wall, is placed in stoving oven, to be progressively warming up to 350 ℃ of insulations and to dry for 12 hours.
Claims (3)
1. the cooling stave of a pre-hung slag crust, comprise water-cooled tube, cooling stave metal body and be covered in the pre-hung slag crust material of metal cools wall inwall on blast furnace inner side, it is characterized in that: cooling stave metal body material is cast-iron cooling wall or cast steel cooling wall or copper cooling wall, pre-hung slag crust material is artificial synthetic slag leather material, by weight, 30 parts of calcineds bauxite in powder, 50 parts of lapis amiridiss, 50 parts of carborundum powders, 15 parts of alumina powders, 10 parts of silicon powders, 15 parts of bonding agents, 2 parts of water reducers, 15 parts of calcium silicate powders and steel fiber, bonding agent is aluminate cement; In pre-hung slag crust material, the content of steel fiber is volume fraction 10%～20%, and weight fraction 15%～40%.
2. the cooling stave of pre-hung slag crust according to claim 1, is characterized in that: metal body and pre-hung slag crust rely on the dovetail-indent interlock on metal body surface to fix.
3. the cooling stave of pre-hung slag crust according to claim 1 and 2, it is characterized in that: pre-hung slag crust material is to adopt filling forming method to make, by size design supporting mould, in dovetail-indent and the whole spaces of mould, evenly dispense after steel fiber, the pre-hung slag crust mud being stirred is injected in whole steel fibers space, during slip casting, coordinate vibration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010175376.8A CN102251066B (en) | 2010-05-18 | 2010-05-18 | Cooling wall with pre-coated slag crust |
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| CN201010175376.8A CN102251066B (en) | 2010-05-18 | 2010-05-18 | Cooling wall with pre-coated slag crust |
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| CN102251066A CN102251066A (en) | 2011-11-23 |
| CN102251066B true CN102251066B (en) | 2014-03-26 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584294B (en) * | 2012-02-28 | 2013-06-05 | 贵阳东吉博宇耐火材料有限公司 | Composite fire-proof material with high refractoriness under load for coke ovens as well as furnace-building process and products thereof |
| CN104531929B (en) * | 2014-12-11 | 2016-11-09 | 马鞍山华盛冶金科技发展有限公司 | A kind of preparation method of the solid packing of cast steel cooling wall casting |
| CN109719384A (en) * | 2019-01-19 | 2019-05-07 | 汕头华兴冶金设备股份有限公司 | A kind of novel wear resistant copper cooling wall and its manufacturing method |
| CN109971902A (en) * | 2019-04-15 | 2019-07-05 | 柳州钢铁股份有限公司 | Blast furnace cooling stave is poured permanent protective layer |
| CN111197114B (en) * | 2020-03-11 | 2024-02-06 | 广西柳州钢铁集团有限公司 | Blast furnace cooling wall |
| CN113046136A (en) * | 2021-03-30 | 2021-06-29 | 卢玉升 | Novel water-cooled wall protective structure |
| CN113308589A (en) * | 2021-06-19 | 2021-08-27 | 山东天铭重工科技股份有限公司 | Copper column reinforced cooling cast iron cooling wall |
| CN115786609A (en) * | 2022-11-04 | 2023-03-14 | 河北万丰冶金备件有限公司 | Cooling wall for blast furnace |
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| US4767323A (en) * | 1987-06-22 | 1988-08-30 | Westinghouse Electric Corp. | Lime kiln and method of retarding formation of slag ring therein |
| CN1401791A (en) * | 2002-09-21 | 2003-03-12 | 郑州华宇耐火材料集团公司 | Non-metal cooling wall and mfg. method thereof |
| CN2542676Y (en) * | 2002-05-28 | 2003-04-02 | 漯河中贯冶金机械有限公司 | Totally brick-lined cooling wall |
| CN2581457Y (en) * | 2002-09-21 | 2003-10-22 | 郑州华宇耐火材料集团公司 | Non metal cooling wall |
| CN101367664A (en) * | 2008-09-28 | 2009-02-18 | 瑞泰科技股份有限公司 | Composite combined aluminum oxide-silicon carbide-(carbon) system amorphous refractory material |
| CN201212040Y (en) * | 2008-07-04 | 2009-03-25 | 张殿有 | Combined cooling stave |
| CN101434490A (en) * | 2008-09-28 | 2009-05-20 | 瑞泰科技股份有限公司 | Composite fire resistant pouring material |
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2010
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4767323A (en) * | 1987-06-22 | 1988-08-30 | Westinghouse Electric Corp. | Lime kiln and method of retarding formation of slag ring therein |
| CN2542676Y (en) * | 2002-05-28 | 2003-04-02 | 漯河中贯冶金机械有限公司 | Totally brick-lined cooling wall |
| CN1401791A (en) * | 2002-09-21 | 2003-03-12 | 郑州华宇耐火材料集团公司 | Non-metal cooling wall and mfg. method thereof |
| CN2581457Y (en) * | 2002-09-21 | 2003-10-22 | 郑州华宇耐火材料集团公司 | Non metal cooling wall |
| CN201212040Y (en) * | 2008-07-04 | 2009-03-25 | 张殿有 | Combined cooling stave |
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Address after: 101400, No. 9, Long Yun Road, Jingwei Industrial Zone, North Housing Town, Huairou District, Beijing Patentee after: Beijing United Rong Da engineering materials Limited by Share Ltd Address before: 101400, No. 9, Long Yun Road, Jingwei Industrial Zone, North Housing Town, Huairou District, Beijing Patentee before: Beijing Allied Rongda Engineering Material Co., Ltd. |