CN104451008B - A kind of blast furnace gravity flow fire-resistant castable construction method - Google Patents

A kind of blast furnace gravity flow fire-resistant castable construction method Download PDF

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Publication number
CN104451008B
CN104451008B CN201410124962.8A CN201410124962A CN104451008B CN 104451008 B CN104451008 B CN 104451008B CN 201410124962 A CN201410124962 A CN 201410124962A CN 104451008 B CN104451008 B CN 104451008B
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cooling
castable
construction
furnace
cast
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CN104451008A (en
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桂学锋
李涛
张伟
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Lian Feng Steel (Zhangjiagang) Co., Ltd.
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Jiangsu Yonggang Group Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B7/00Blast furnaces
    • C21B7/04Blast furnaces with special refractories
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00Casings; Linings; Walls; Roofs
    • F27D1/16Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1626Making linings by compacting a refractory mass in the space defined by a backing mould or pattern and the furnace wall

Abstract

The present invention relates to a kind of blast furnace gravity flow fire-resistant castable construction method, including determining castable aggregate size, molding, stirring castable, cast and a few procedure of casting complete post processing, one-step cooling wall is often installed, molding pours into a mould one section, when the 6th section to the 9th open cast of section large area, 4 gravity flow pouring construction locations are uniformly set in inside circumference, 4 construction locations are constructed according to a direction order, the cast bed of material is made not deposit omission, hollow joint, bigger with furnace shell gap particular for the 6th section of copper cooling wall of bosh, the molding mode that the uncovered feature in bottom takes tuyere holder to combine with unsettled hanging scaffold is poured into a mould.The present invention instead of traditional anhydrous mud press-in technique, solves and alters coal gas between the stove skin caused because of mud jacking leakiness of long-standing problem and cooling wall, and stove skin temperature raises rubescent a, difficult problem for cooling wall breakage, stove skin cracking.

Description

A kind of blast furnace gravity flow fire-resistant castable construction method
Technical field
The present invention relates to blast furnace engineering technical field of construction, particularly a kind of blast furnace gravity flow fire-resistant castable construction method, filling paste between cooling wall and furnace shell in blast furnace, it is adaptable to large-scale newly-built blast furnace.
Background technology
Between the furnace shell of tradition main flow blast furnace and cooling wall, spacing only has about 30mm, is pressed into anhydrous mud in gap;And 1080 blast furnaces of institute of Shangdong Design Inst of Metallurgy design at bosh, furnace bosh, shaft the maximum spacing of cooling wall and furnace shell at about 600mm, anhydrous press-in mud on original design is easy volume contraction after high-temperature concretion, fill leakiness, hollow joint occurs, blast furnace can be caused to gang up coal gas, and stove skin is rubescent, cracking affects blast furnace safety and produces.
It is reported before blast furnace is established, the blast furnace of domestic more same type as the north some steel mill's blast furnace after operation in the short period cupola well, bosh all go wrong, blast furnace is forced blowing out overhaul, and economic loss is huge.And at home this type blast-furnace production campaign more than 3 years and few.
At present between furnace shell and cooling wall, use anhydrous press-in mud due to blast furnace, in process of production body of heater occur running this situation of coal gas be long-standing problem we smelt iron the major hidden danger of safety in production.For solving this problem, the remedial measure of perforate mud jacking on stove skin is taked during can only taking advantage of blast furnace scheduled overhaul, this measure is constructed loaded down with trivial details, expensive (mud jacking price: 16000 yuan/ton) and is not often reached expected effect, can not thoroughly solve filler between furnace shell and cooling wall from root and produce gap race this potential safety hazard of coal gas, and gang up, due to what filler reason caused, the anomalous fracture one of the main reasons that coal gas is blast furnace cooling stave between furnace shell and cooling wall.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of blast furnace gravity flow fire-resistant castable construction method, casting and constructing is expected from selecting suitably filling, overcome the shortcoming and defect of prior art, solve and between furnace shell and cooling wall, gang up the problem that coal gas, stove skin are easy to crack.
For solving above-mentioned technical problem, in terms of castable selection, through taking into full account blast furnace each position environment characteristics and combining manufacturing technique requirent, coordinate corresponding construction technology, use gravity flow fire-resistant castable technology.And this kind of castable has the handling characteristics of normal temperature cure as atypic fire-resistant castable, construction technology is easy compared with other atypic refractory materials, has higher mobility, meets the use of special environment, and intensity is high after normal temperature cure, the utilization rate 100% of material.
A kind of blast furnace gravity flow fire-resistant castable construction method, step includes:
1, determining castable aggregate size: requiring that aggregate size is less than 8mm on the whole, wherein the aggregate of 3mm grade accounts for 60%, the physical and chemical index detection to castable is qualified.
null2、Molding: template uses hard plank molding,Require that template strength is the most indeformable,Fixation does not shifts,Guarantee during cast the most cruelly to starch、Spillage,When furnace bottom first paragraph cooling wall molding,Template is pressed close to cooling wall lower end,Circumference is against furnace shell,Circumferential weld will be reserved between cooling wall lower end and furnace bottom shrouding and furnace shell,Meet lower one ramming mass construction requirement,When second segment cooling wall starts molding, mode is different,Guarantee from furnace bottom first paragraph cooling wall integral to 16 sections of cooling wall cast connections of furnace roof,It should be noted that template is inserted into the cooling wall back side and flushes during molding between first paragraph and second segment cooling wall circumferential weld,Can not be adjacent to again to furnace shell,The spacing of template and furnace shell is equal to the spacing of cooling wall with furnace shell,Layering space is produced after avoiding causing cast,Perps between every piece of cooling wall template plug jail,Completely take out after end to be cast,Meet lower one joint filling operation,The system of pouring into a mould of molding mode according to this 16 sections,Guarantee the cast effect that body of heater is overall,Perforate grouting works without the later stage.The most often installing one-step cooling wall, molding pours into a mould one section, and the inspection to the pour mass construction effect of each section, each piece cooling wall has relatively strong visual, can be intuitively the construction quality of control overall process.
3, stirring castable: the foreign material in blender are cleaned out, packed castable is poured in blender according to blender ability to work size, castable stirring amount of water is according to water distribution requirement, generally at 5-9%, preferably lack unsuitable many according to locality construction weather amount of water, using forced mixer castable fully to be stirred evenly, add water after additive and castable being dry mixed uniformly stirring.Release after stirring 8-10 minute and can use.
4, cast: often install one-step cooling wall, molding pours into a mould one section, when the 6th section to the 9th open cast of section large area, 4 gravity flow pouring construction locations are uniformly set in inside circumference, 4 construction locations are constructed according to a direction order, making to pour into a mould the bed of material and do not deposit omission, hollow joint, the molding mode taking tuyere holder to combine with unsettled hanging scaffold with furnace shell gap compared with big, the feature of bottom uncovered (width reaches 570mm) particular for the 6th section of copper cooling wall of bosh is poured into a mould.Casting process is paid close attention to the moisture of castable and raw-material proportioning situation at any time, it is ensured that fully, uniform stirring and and layered vibrate, propose slurry work, it is ensured that the density of every section of pour mass, it is to avoid isolation and cavitation occurs in pouring layer.Typically complete, in order to avoid castable is dry and hard construction in 30 minutes.
5, repeat the step 3 process to step 4, complete the cast overall to cooling wall.
6, the process after casting complete: must not pressurized and being shaken before pour mass solidification, material feeding set strength to be poured arrives form removal after requiring, the demoulding after typically requiring castable to solidify 24 hours, after form removable, pour mass is checked, peeling and cavity problem is had to repair in time, place empty, that crack problem is serious to be cut, again pours into a mould solid.
The present invention brings following beneficial effect:
1, domestic traditional limitation that must use non-aqueous based material technique at furnace bottom, cupola well position has been broken.
2, instead of traditional anhydrous mud press-in technique, fill up the blank of domestic same type blast furnace architectural history.
3, easy construction and speed are fast, and pour mass steady quality is uniform, visual strong, solve the disguise of mud-jacking technology very well.4 are well combined with furnace shell, cooling wall, good with furnace shell, cooling wall matching type in permanent line change and thermal coefficient of expansion.Solving and alter coal gas between the stove skin caused because of mud jacking leakiness of long-standing problem and cooling wall, stove skin temperature raises rubescent a, difficult problem for cooling wall breakage, stove skin cracking.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
In terms of castable selection, we select the gravity flow fire-resistant castable of company limited of Liao Zhongye Wuhan Research Institute Of Metallurgy Building, wherein AL2O3Content >=50%, bulk density >=2.0g/cm3, 1000 DEG C × 3h compressive resistance >=30MPa, rupture strength >=8MPa, Linear change rate ± 0.5%, heat conductivity≤0.6(350 DEG C) W/(m.K), there is following performance characteristics: high temperature resistant, moderate strength, there is certain plasticity;There is good mobility, dense packing effect in complex space;Aggregate size, grade are reasonable, meet small space handling characteristics;Firm time is controlled, normal temperature cure;Volume ungauged regions after consolidation, Linear change rate is little;Easy construction, meets remotely pumping.
1, before construction, first detecting the aggregate size of castable, require that the aggregate that aggregate size is less than 8mm, 3mm grade accounts for 60% on the whole, the physical and chemical index detection to castable is qualified.Scene storage requires: moistureproof, rainproof, high temperature-proof.
2, when furnace bottom first paragraph cooling wall molding, wooden template being pressed close to cooling wall lower end, circumference, against furnace shell, will reserve circumferential weld between cooling wall lower end and furnace bottom shrouding and furnace shell, meets lower one ramming mass construction requirement.Molding mode is started different from second segment cooling wall, template is inserted into during molding between first paragraph and second segment cooling wall circumferential weld the cooling wall back side flush, no longer it is adjacent to furnace shell, distance between furnace shell and template is equal with the spacing of cooling wall and furnace shell, in order to avoid producing layering space after causing cast.Perps between every piece of cooling wall template plug jail, cast is complete after terminating takes out, and meets lower one joint filling operation, the system of pouring into a mould of molding mode according to this 16 sections, it is ensured that the cast effect that body of heater is overall, it is not necessary to the perforate grouting works in later stage.
3, before construction, first the foreign material in blender are cleaned out, packed castable is poured in blender according to blender ability to work size, castable stirring amount of water is constructed weather according to locality, generally at 5-9%, and preferably lack unsuitable many, use forced mixer castable fully to be stirred evenly, add water after additive and castable being dry mixed uniformly stirring, releases and can use after stirring 8-10 minute.
4, one-step cooling wall is often installed, molding pours into a mould one section, when the 6th section to the 9th open cast of section large area, 4 gravity flow pouring construction locations are uniformly set in inside circumference, 4 construction locations are constructed according to a direction order, making to pour into a mould the bed of material and do not deposit omission, hollow joint, the molding mode taking tuyere holder to combine with unsettled hanging scaffold with furnace shell gap compared with big, the feature of bottom uncovered (width reaches 570mm) particular for the 6th section of copper cooling wall of bosh is poured into a mould.Casting process is paid close attention to the moisture of castable and raw-material proportioning situation at any time, it is ensured that fully, uniform stirring and and layered vibrate, propose slurry work, it is ensured that the density of every section of pour mass, it is to avoid isolation and cavitation occurs in pouring layer.Typically complete, in order to avoid castable is dry and hard construction in 30 minutes.
5, repeat step 3 and arrive step 4, complete until cooling wall is integrated poured.
6, after casting complete, before pour mass is solidified must not pressurized and being shaken, material feeding set strength to be poured arrives form removal after requiring (observing intensity according to construction environment and pour mass thickness), typically requires the demoulding after castable solidification 24 hours.After form removable, pour mass is checked, be found to have the quality problems such as peeling and cavity and process in time and repair, place empty, that crack is serious to be cut, again pours into a mould solid.
Compared with tradition mud-jacking technology, blast furnace of the present invention gravity flow fire-resistant castable construction method once-cast success, it is not necessary to the later stage mends slurry, and each spot temperature of blast furnace is stable, stove skin temperature about 40 DEG C, and produce and do not occur so far because of the later stage mud jacking work of cold drawing with furnace shell string coal gas.
Tradition blast furnace uses anhydrous press-in mud, owing to bonding agent volatile quantity and shrinkage factor are relatively big, and complete that the construction volume of same volume is the weight of castable 1.3 times.Same single seat 1080m3Blast furnace, about needs 208 tons with anhydrous slurry casting, and uses fire-resistant castable to use the construction method of the present invention, needs 160 tons altogether, and total cost declines 78%.
It is above the better embodiment of the present invention, but protection scope of the present invention is not limited to this.Any those of ordinary skill in the art in the technical scope that disclosed herein, the conversion expected without creative work or replacement, all should contain within protection scope of the present invention.Therefore protection scope of the present invention should be as the criterion with the protection domain that claim is limited.

Claims (5)

1. a blast furnace gravity flow fire-resistant castable construction method, is characterized in that: be applicable to 1080m3Type blast furnace, comprises the following steps,
(1) castable aggregate size is determined: aggregate size is less than 8mm, and wherein the aggregate of 3mm grade accounts for 60%;
(2) molding: use plank molding, when furnace bottom first paragraph cooling wall molding, recline cooling wall lower end by template, circumference is against furnace shell, circumferential weld is reserved between cooling wall lower end and furnace bottom shrouding and furnace shell, integral to 16 sections of cooling wall cast connections of furnace roof from furnace bottom first paragraph cooling wall, template is inserted into during molding between first paragraph and second segment cooling wall circumferential weld the cooling wall back side flush, can not be adjacent to again to furnace shell, the spacing of template and furnace shell is equal to the spacing of cooling wall with furnace shell, perps between every piece of cooling wall template plug jail, cast is complete after terminating takes out;
(3) stirring castable: the foreign material in blender are cleaned out, pouring in blender by packed castable, use forced mixer castable fully to be stirred evenly, add water after additive and castable being dry mixed uniformly stirring, castable stirring amount of water, at 5-9%, stirs 8-10 minute;
(4) cast: often install one-step cooling wall, molding pours into a mould one section, when the 6th section to the 9th open cast of section large area, uniformly sets 4 gravity flow pouring construction locations in inside circumference, 4 construction locations are constructed according to a direction order so that the cast bed of material does not deposit omission, hollow joint;And the molding mode taking tuyere holder to combine with unsettled hanging scaffold the 6th section of copper cooling wall of bosh is poured into a mould;
(5) repeat step (3) and arrive step (4), complete the cast overall to cooling wall;
(6) process after casting complete: must not pressurized and being shaken before pour mass solidification, material feeding set strength to be poured arrives form removal after requiring, the demoulding after requiring castable to solidify 24 hours, after form removable, pour mass is checked, peeling and cavity problem is had to repair in time, place empty, that crack problem is serious to be cut, again pours into a mould solid.
Blast furnace the most according to claim 1 gravity flow fire-resistant castable construction method, is characterized in that: in described step (3), amount of water is different with weather according to construction seasons, preferably lacks unsuitable many.
Blast furnace the most according to claim 1 gravity flow fire-resistant castable construction method, it is characterized in that: the casting process of described step (4) is paid close attention to the moisture of castable and raw-material proportioning situation at any time, guarantee fully, uniform stirring and and layered vibrate, propose slurry work, ensure the density of every section of pour mass, it is to avoid isolation and cavitation occurs in pouring layer.
Blast furnace the most according to claim 1 gravity flow fire-resistant castable construction method, is characterized in that: the castable being stirred in described step (4) is complete construction in 30 minutes, so as not to dry and hard.
5., according to the blast furnace gravity flow fire-resistant castable construction method described in any one of claim 1 to 4, it is characterized in that: Al in the composition of described castable2O3Accounting is more than 50%.
CN201410124962.8A 2014-03-31 2014-03-31 A kind of blast furnace gravity flow fire-resistant castable construction method Active CN104451008B (en)

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Publication number Priority date Publication date Assignee Title
CN107299173A (en) * 2017-07-13 2017-10-27 上海二十冶建设有限公司 Segmentation pours the filling method between cooling wall in blast furnace
CN108251585B (en) * 2018-01-23 2020-03-27 宝钢湛江钢铁有限公司 Method for ramming blast furnace hearth circumferential seam filler
CN111270033A (en) * 2020-03-11 2020-06-12 广西柳州钢铁集团有限公司 Construction method for casting silica gel in gap between blast furnace shell and cooling wall

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CN1417549A (en) * 2001-11-06 2003-05-14 武汉威林炉衬材料有限责任公司 Large-area self-flowing converter repairing material
CN1908565A (en) * 2006-08-04 2007-02-07 河南豫光金铅股份有限公司 Hot repair method of lead-making furnace body
CN101851692A (en) * 2010-06-02 2010-10-06 河北省首钢迁安钢铁有限责任公司 Construction method for curing non-aqueous slurry at normal temperature in blast furnace

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Publication number Priority date Publication date Assignee Title
CN1417549A (en) * 2001-11-06 2003-05-14 武汉威林炉衬材料有限责任公司 Large-area self-flowing converter repairing material
CN1908565A (en) * 2006-08-04 2007-02-07 河南豫光金铅股份有限公司 Hot repair method of lead-making furnace body
CN101851692A (en) * 2010-06-02 2010-10-06 河北省首钢迁安钢铁有限责任公司 Construction method for curing non-aqueous slurry at normal temperature in blast furnace

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Effective date of registration: 20190705

Address after: 215600 Yonglian Village, Nanfeng Town, Zhangjiagang City, Jiangsu Province

Patentee after: Lian Feng Steel (Zhangjiagang) Co., Ltd.

Address before: 215600 Yonglian Industrial Park, Nanfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province, General Office of Yonggang Group (Jiangsu Yonggang Group Co., Ltd.)

Patentee before: Jiangsu Yonggang Group Co., Ltd.

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