CN102251066A - Cooling wall with pre-coated slag crust - Google Patents
Cooling wall with pre-coated slag crust Download PDFInfo
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- CN102251066A CN102251066A CN2010101753768A CN201010175376A CN102251066A CN 102251066 A CN102251066 A CN 102251066A CN 2010101753768 A CN2010101753768 A CN 2010101753768A CN 201010175376 A CN201010175376 A CN 201010175376A CN 102251066 A CN102251066 A CN 102251066A
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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) usefulness steel etc. at present.Cooling stave have towards the surface of blast furnace inboard the light face, tongue and groove, other structure formations are also arranged, but mainly still the tongue and groove structure be main.The effect of tongue and groove is to be convenient to inlay the refractory materials protective layer and to be convenient to after refractory materials is worn form the dross protective layer on the cooling stave surface.
The refractory brick that is embedded in the cooling stave surface can effectively protect cooling stave not worn and torn by furnace charge, also forms one thermal resistance simultaneously in the furnace wall to reduce furnace wall heat radiation energy consumption.But the refractory materials on cooling stave surface environment for use of living in is very harsh, it wants to bear for a long time the washing away of wearing and tearing, rising coal gas stream of erosion, the furnace charge of slag, the thermal shocking of temperature variation etc. under the pyritous condition, thereby general some months or just progressively worn and torn slightly for a long time or wash away.The refractory materials reason that washes away that is worn mainly is that refractory materials is generally hard brittle material, and the significant shear power at dovetail-indent place is easy to cause the root fracture of edge brick, thus cause the refractory materials protective layer come off in addition integral body collapses.
Not had the protection of refractory materials, will come out and directly contact washing away and corroding of high temperature furnace charge and furnace gas in the cooling stave surface.Simultaneously, owing to there be not the heat insulation of refractory masses, cooling stave internal cooling water can be taken away a large amount of heats, causes scattering and disappearing of a large amount of heats, shows as the high coke ratio and the high energy consumption of production.
Fusion zone at blast furnace; after the cooling stave refractory materials is washed away; slag can bond to and form a protective layer on the furnace wall; the effect of slag protective layer is heat insulation equally and prevents that the cooling stave surface is worn; but this slag crust and cooling stave is bonding insecure; can frequently come off, cause the cooling stave local superheating sometimes, even burn indivedual cooling staves.
And generally seldom there is slag the middle and upper part of blast furnace, so after the cooling stave refractory materials is worn, has been difficult to slag and adhered to, and this will inevitably cause the direct wearing and tearing and the thermal losses greatly of cooling stave metal construction.Since the water-cooled tube of a lot of blast furnaces be up and down UNICOM single channel control, blast furnace may cause the decline of overall operation efficiency because the middle and upper part cooling intensity is excessive.
In order to prevent 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; purpose all is after the inwall refractory materials is worn, and manages to construct on inwall again the new refractory materials protective layer of one deck.
But no matter be spray repair or be pressed into that the work-ing life of material is still very short, general half a year of the liner of dry spraying or promptly come off for a long time slightly.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 anti-material and damaging back or gunning material and damage, can only look to cooling stave to adhere to adhering to one deck slag come heat insulation and the protection cooling stave.
Summary of the invention
Because the working condition in the blast furnace is very abominable, which kind of refractory materials the cooling stave hot side no matter adopt, and its life-span can be not oversize.How to form stable slag crust protective layer, be only and solve energy Conservation of Blast Furnace and long-lived key on the cooling stave surface.
Purpose of the present invention will be developed high strength, high heat conduction and resistant to elevated temperatures cooling stave wall covering material exactly, and before cooling stave is installed blast furnace, with appropriate means this material is fixed on the inner wall surface of cooling stave.This material can not cause tectal collapsing because of the fracture at dovetail-indent place, 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 the cooling stave hot side.Wall to be cooled is installed after the blast furnace, is equivalent to have on the cooling stave inwall the permanent pre-hung slag of one deck, plays protection cooling stave and heat-blocking action, and the long-term safety existence, prolongs cooling stave and even the purpose of blast furnace campaign thereby reach.
Concrete scheme of the present invention is: have prefabricated one deck synthetic slag crust material on cast iron, cast steel or the copper cooling wall inwall of dovetail-indent at inwall, this synthetic slag crust material is prepared by a certain percentage by refractory materials and Calucium Silicate powder powder and metallic steel fiber.Refractory materials is mixed evenly by a certain percentage by alumina, corundum, silicon carbide, alumina powder, silicon ash and wedding agent, water reducer, and wedding agent is aluminate cement or phosphoric acid or aluminium dihydrogen phosphate etc.The content of steel fiber should reach 10%～20% by volume in this synthetic slag crust material, and weight ratio should reach 15%～40%.The adding of Calucium Silicate powder powder is in order to guarantee the easier in use adhesion in-furnace slag of artificial slag crust.
Specific implementation method of the present invention is: at first prepare above-mentioned prefabricated slag crust material blends (not comprising steel fiber in the mixture), and adding tap water or liquid wedding agent (phosphoric acid or aluminium dihydrogen phosphate), that mixture is stirred into mud is standby.Determine prefabricated slag crust layer thickness, generally can be defined as 50～200mm thick (not comprising depth of dovetail), a top plate on cooling stave successively evenly is sprinkled into cooling stave dovetail-indent and position, whole prefabricated slag crust space with the metallic steel fiber then.Fill up in the dovetail-indent after the steel fiber, inject above-mentioned mud.Because the flowing property of mud is fabulous, also cooperates vibration template in the time of slip casting, the institute that slurry can fill up between steel fiber very soon is gapped.The injection body sclerosis back demoulding to be poured is baked to 350 ℃ and gets final product.
Key problem in technology of the present invention is: contain the steel fiber of high volume fraction in the prefabricated slag crust material, its shared volume fraction 10%～20%.(strengthen the content of steel fiber in the refractory castable far above conventional steel fiber just because of containing a large amount of steel fibers in this prefabricated slag crust, content of steel fiber is by weight not being higher than 5% in the general steel fiber enhancing refractory castable, can not be higher than 2% by volume), 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 dovetail-indent shear fracture at the interface can not take place in the slag crust layer, shows as on the whole to have high wear-resisting anti-mechanical shock performance yet.
Key problem in technology of the present invention also is: contain the Calucium Silicate powder powder in the prefabricated slag crust material, the adding purpose of Calucium Silicate powder powder is to make prefabricated slag crust material more near slag composition (the blast furnace granulated slag composition mainly is the Calucium Silicate powder mineral), thereby makes the easier adhesion slag that adheres to of prefabricated slag crust.
Pre-hung slag crust cooling stave cold junction body material of the present invention and structure are flexible, cast-iron cooling wall, cast steel cooling wall or copper cooling wall all can, dovetail-indent or other structures that can bite or tangle the pre-hung slag crust can.
The invention has the advantages that:
1, pre-hung slag crust cooling stave of the present invention had covered the artificial slag crust material of one deck in advance at hot side before building by laying bricks or stones; and this pre-hung slag crust layer material is because of having high anti-folding high abrasion and high fire performance; so can be steadily in the long term attached on the 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 added a large amount of steel fibers in the pre-hung slag crust; its thermal conductivity is considerably beyond the existing refractory materials that is embedded on the cooling stave; simultaneously because be furnished with the Calucium Silicate powder powder in the pre-hung slag crust composition; even therefore through pre-hung slag crust material behind the life-time service wearing and tearing attenuation takes place; its uneven surface near slag one side in the stove also can be easy to condensation and adhere to the slag protective layer, and this adhesion slag layer combines closely difficult drop-off with the pre-hung slag layer.
3, according to the position difference of blast furnace, used refractory materials can be according to the environment for use adjustment in the pre-hung slag crust material, such as improving thermal conductivity by improving the silicon carbide ratio, reduces the Calucium Silicate powder consumption with the fire performance that improves pre-hung slag crust material etc.
4, pre-hung slag crust cooling stave cold junction body material of the present invention and structure are flexible, cast-iron cooling wall, cast steel cooling wall or copper cooling wall all can, dovetail-indent or other structures that can bite or tangle the pre-hung slag crust can.
5, because 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 the cooling stave heat radiation reduces, so the cooling stave comprehensive cost of pre-hung slag crust is low, once can forever use after the investment.
Description of drawings
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 the metal cools wall, and 3 are the pre-hung slag crust.The root of pre-hung slag crust is embedded in the dovetail-indent of metal cools wall, and the interlock by dovetail-indent, guarantees that whole pre-hung slag crust fixedly secures on the inwall of metal cools wall.
Embodiment
The 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.
Prepare the copper wall of what a band dovetail-indent,, copper cooling wall as a side template, is propped up good mould according to the thickness of the slag crust 150mm (not comprising depth of dovetail) of design.In mould, dispense steel fiber, carefully dispense to guarantee that the steel fiber volume accounts in the mould all 15% of spatial volumes.
In the mould of filling steel fiber, inject the above-mentioned mud that stirs.
Cooperation guarantees whole steel fiber gap is full of above-mentioned mud to the vibration of mould.
At room temperature together with the mould maintenance after at least 24 hours, above-mentioned pour mass promptly hardens.
Continue maintenance 72 hours after the demoulding.
Slag crust places and progressively is warming up to 350 ℃ of insulations oven dry in 12 hours in the stoving oven together with copper cooling wall.
Claims (6)
1. the cooling stave of a pre-hung slag crust, comprise water-cooled tube, cooling stave metal body and be covered in pre-hung slag crust material on the metal cools wall inwall (towards the blast furnace inboard), 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, be made up of alumina, corundum, silicon carbide, alumina powder, silicon ash, wedding agent, water reducer, calcium silicate powder, steel fiber, wedding agent is aluminate cement or phosphoric acid or aluminium dihydrogen phosphate.
2. the cooling stave of pre-hung slag crust according to claim 1 is characterized in that: in the prefabricated slag crust material, the content of metallic steel fiber is up to volume fraction 10%～20%, and weight fraction is up to 15%～40%.
3. the cooling stave of pre-hung slag crust according to claim 1 is characterized in that: in the prefabricated slag crust material, be furnished with the refractory materials powder, comprise high alumina, corundum, silicon carbide, alumina powder, silicon powder.
4. cooling stave according to claim 1 is characterized in that: in the prefabricated slag crust material, be furnished with the Calucium Silicate powder powder.
5. 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.Fixed form also can be other any ways, can combine closely on the metal body structure as long as can guarantee the pre-hung slag crust.。
6. the cooling stave of pre-hung slag crust according to claim 1 and 2, it is characterized in that: prefabricated slag crust material is to adopt filling forming method to make, promptly by size design supporting mould, after in dovetail-indent and the whole spaces of mould, evenly dispensing steel fiber, the pre-hung slag crust mud that stirs is injected in whole fiber gaps, cooperate vibration during slip casting.
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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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| CN102251066B CN102251066B (en) | 2014-03-26 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584294A (en) * | 2012-02-28 | 2012-07-18 | 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 |
| CN104531929A (en) * | 2014-12-11 | 2015-04-22 | 马鞍山华盛冶金科技发展有限公司 | Preparation method of solid filler for casting cast steel cooling wall |
| 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 |
| CN111197114A (en) * | 2020-03-11 | 2020-05-26 | 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 |
| 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 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584294A (en) * | 2012-02-28 | 2012-07-18 | 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 |
| 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 |
| CN104531929A (en) * | 2014-12-11 | 2015-04-22 | 马鞍山华盛冶金科技发展有限公司 | Preparation method of solid filler for casting cast steel cooling wall |
| 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 |
| CN111197114A (en) * | 2020-03-11 | 2020-05-26 | 广西柳州钢铁集团有限公司 | Blast furnace cooling wall |
| 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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| CN102251066B (en) | 2014-03-26 |
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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. |