CN103276130B - Maintenance method for air leakage from pipeline of hot-air system of blast furnace - Google Patents
Maintenance method for air leakage from pipeline of hot-air system of blast furnace Download PDFInfo
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- CN103276130B CN103276130B CN201310205925.5A CN201310205925A CN103276130B CN 103276130 B CN103276130 B CN 103276130B CN 201310205925 A CN201310205925 A CN 201310205925A CN 103276130 B CN103276130 B CN 103276130B
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Abstract
The invention discloses a kind of Maintenance method for air leakage from pipeline of hot-air system of blast furnace, belong to pipeline and run wind process method.First race wind place processes by the present invention, refractory brick is made a breach, again the steel plate prepared is sling along refractory brick inwall in indentation, there, be equivalent to the pouring layer of refractory brick along steel plate cast high alumina castable to be formed, conduit enclosure carry out after mulch-laying machine fibreboard made by pouring layer repair, mud jacking.The present invention carries out repairing treatment running the outside refractory brick to destroying of wind pipeline, the time of the stove that cools such as to eliminate, substantially reduces the time of blast furnace stopping maintenance, improve working efficiency, also reduce the financial loss brought by blowing out simultaneously; The method also proposes different processing schemes for different damage areas, both ensure that construction safety and the operating efficiency of operating worker, has also been applicable to various pipeline, can promote the use of.
Description
Technical field
The present invention relates to blast furnace technical field of construction
.
Background technology
Due to the impact of the many factors such as the operation in the quality of the welding quality of pipeline, masonry quality, material, production process in blast furnace production process, hot-air system pipeline there will be the situation that pipeline runs wind.Usually to the processing scheme of hot-air system pipeline race wind be: blast furnace staying, after pipeline cooling, opening conduits ascertains the reason, and staff enters in pipeline the refractory lining body of again building by laying bricks or stones and destroying when running wind, repairs pipeline shell, Dispose by grouting.But in this processing mode, only cool stove one step just needs at least 3 days, adds other steps time used, whole mending course needs to take a long time, and the production and the subsequent technique that have had a strong impact on blast furnace are produced.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of Maintenance method for air leakage from pipeline of hot-air system of blast furnace, and the method can substantially reduce the time of blast furnace stopping maintenance, increases work efficiency, reduces the financial loss brought by blowing out.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of Maintenance method for air leakage from pipeline of hot-air system of blast furnace, comprises the steps:
1) blast furnace staying, closes all hot blast valves; At race wind place opening conduits shell, the ignition-face area of the conduit enclosure opened is greater than the ignition-face area that refractory brick comes off, and the refractory brick sled loosened the position that comes off falls;
2) refractory matter of slump in pipeline is cleaned out;
3) steel plate that the cambered surface preparation come off according to refractory brick is suitable with it, the ignition-face area of described steel plate is greater than the ignition-face area that refractory brick comes off; The steel plate prepared is sling along refractory brick inwall; When the area that comes off of refractory brick is greater than 0.6m × 0.6m, lays one deck rock wool on the surface of the steel plate set up and get rid of silk rug;
4) intact in steel plate outer refractory brick high alumina castable cast comes off position vibration compacting forms pouring layer; When the area that comes off of refractory brick is greater than 0.6 m × 0.6m, first gets rid of on silk rug rock wool and build inner ring brick, inner ring brick closes when door place can not lay bricks and carries out cast with the refractory brick that high alumina castable is intact in steel plate outer and vibration compacting formation pouring layer;
5) at pouring layer surface coverage one deck mechanism fiberboard;
6) conduit enclosure opened is recovered by shell steel plate cutting;
7) Dispose by grouting is carried out to the conduit enclosure of maintenance section.
When the area that comes off of refractory brick is greater than 0.6m × 0.6m, steel plate thickness used is 3mm; When the area that comes off of refractory brick is less than or equal to 0.6m × 0.6m, steel plate thickness used is 2mm.
The parameter that described high alumina castable requires is: Al
2o
3>=65%, refractoriness>=1750 DEG C, refractoriness under load>=1500 DEG C, ultimate compression strength reaches 80-100MPa 1500 DEG C time, and folding strength reaches 13-18MPa 1500 DEG C time.
The thickness of described machine-processed fiberboard is 20mm.
In casting process, between high alumina castable and refractory brick, dilatation joint is set.
Pouring layer arranges dilatation joint according to predetermined space along expansion direction.
The technical progress adopting technique scheme to obtain is: the present invention carries out repairing treatment at the outside lining body to destruction of race wind pipeline and refractory brick, the time of the stove that cools such as to eliminate, substantially reduce the time of blast furnace stopping maintenance, improve working efficiency, also reduce the financial loss brought by blowing out simultaneously; The method also proposes different processing schemes for different damage areas, both ensure that construction safety and the operating efficiency of operating worker, has also been applicable to various pipeline, can promote the use of.
Accompanying drawing explanation
Fig. 1 is that refractory brick comes off the internal structure schematic diagram of area maintenance pipeline when being less than 0.6m*0.6m;
Fig. 2 is that refractory brick comes off the internal structure schematic diagram of area maintenance pipeline when being greater than 0.6m*0.6m;
Wherein, 1, conduit enclosure, 2, refractory brick, 3, pouring layer, 4, steel plate, 5, machine-processed fiberboard, 6, shell steel plate, 7, rock wool gets rid of silk rug, 8, inner ring brick.
Embodiment
With multiple embodiment, the present invention is described in detail below.
Embodiment 1
Manufacturing district, Xinxing Cast Pipes Co., Ltd Wuan on May 6 in 2006 one smelts iron 1#460m
3wind is run suddenly in blast-furnace hot-air surrounding pipes top, there is the crack of a 0.4m in conduit enclosure, rush to repair according to method of the present invention, construction equipment used: machine,massing 1, vibrating head 1 overlap, welding tool 1 overlaps, gas welding unit 1 overlaps, mud jacking equipment 1 overlaps, 1.5m crowbar 1;
Construction material: δ=2mm steel plate, diameter 1.2mm iron wire 20m, conduit enclosure equal thickness shell steel plate 1m
2, thick 20mm machine-processed fiberboard 1m
2, non-water system press-in material 1 ton.
Concrete operation step is as follows:
1, the urgent damping down of blast furnace, closes all hot blast valves; Conduit enclosure 1 thickness is 10mm, at race wind place opening conduits shell 1, the ignition-face area of the breach opened is 0.6m × 0.6m, remove the refractory brick 2 destroyed, find that refractory brick 2 has come off the breach of about 0.3m × 0.4m, prized by the refractory brick 2 loosened around this breach, connect solid refractory brick 2 until expose, the breach on last refractory brick 2 expands as 0.5m × 0.7m.
2, clean out from outside by refractory matters such as the refractory brick 2 of slump in pipeline.
3, be the rectangle that the steel plate 4 of 2mm is prepared into 0.7m × 0.9m by thickness, wear iron wire at the two ends of this steel plate 4 and its inwall along refractory brick 2 is sling.Refractory brick 2 entirety is annular, and the rectangular steel plates 4 of slinging will be curved along the inwall of refractory brick 2.When preparing steel plate 4, the rectangular area of steel plate 4 should be greater than the ignition-face area of the breach that refractory brick 2 is opened, and is usually minimumly about 120% of breach area, steel plate 4 firmly could be hung on the inwall of refractory brick 2 like this.Hang the iron wire of steel plate 4 under the prerequisite ensureing its load-bearing, more thin better.
4, with high alumina castable refractory brick 2 come off position steel plate 4 on pour into a mould, vibration compacting, formed pouring layer 3; Pouring layer 3 is just equivalent to refractory brick 2, and therefore the thickness of pouring layer 3 should be not less than the thickness (when being less than can with machine-processed fiberboard 5 polishing) of refractory brick 2 usually.
5, at pouring layer 3 surface coverage one deck 20mm mechanism fiberboard 5.
6, with thickness be the shell steel plate 6 of 10mm according to the breach blanking that conduit enclosure 1 is opened, to recover the conduit enclosure 1 opened.
7, Dispose by grouting is carried out to the steel pipe near conduit enclosure 1 place of opening around 5m.
The parameter that described high alumina castable requires in the present embodiment is: Al
2o
3>=65%, refractoriness>=1750 DEG C, refractoriness under load>=1500 DEG C, ultimate compression strength reaches 80-100MPa 1500 DEG C time, and folding strength reaches 13-18MPa 1500 DEG C time.And in casting process, between high alumina castable and refractory brick, dilatation joint is set, pouring layer arranges along expansion direction according to the every 50cm of predetermined space the dilatation joint of a 20mm.
In this embodiment, stop production to resuming production 22 hours consuming time altogether from blast furnace.Repair blast furnace so far still to produce normally.If processed according to scheme in the past, only pipeline cooling reaches and just needs 60 hours into people's condition, and reaching working condition needs 80 hours.Method of the present invention has saved 58 hours, the average production per hour of blast furnace about 66 tons of pig iron, calculates, can reduce the loss: 300 yuan × 66 tons/hour × 58 hours=1148400 yuan according to one ton of pig iron, 300 yuan of profits.
Embodiment 2
On August 17th, 2007, Xinxing Cast Pipes Co., Ltd two smelted iron position, 2# blast furnace 2# hotblast stove junctions through production operation for many years, and position, 2# hotblast stove junctions occurs running wind, and 1# and 2# hotblast stove interlude occurs that place's pipeline burns red phenomenon.Open and run wind position and red pipe position and find to run the phenomenon that wind position exists the square slump brick of about 500mm*500mm, top, red pipe position refractory brick integral sinking is about 100mm.Infer that being about 10m long pipeline top lining body from 2# hotblast stove to vertical tube direction is destroyed, and need carry out large repairs thus.
Rush to repair according to method of the present invention, construction equipment used: machine,massing 1, vibrating head 1 overlap, welding tool 1 overlaps, gas welding unit 1 overlaps, mud jacking equipment 1 overlaps, 1.5m crowbar 1.
The steel plate of construction material: δ=3mm, diameter 1.2mm iron wire 50m, shell steel plate with conduit enclosure equal thickness, the machine-processed fiberboard of thick 20mm, non-water system press-in material (fixed depending on refractory brick slump area), refractory brick inner ring brick (fixed depending on refractory brick slump area), rock wool get rid of silk rug (fixed depending on refractory brick slump area), phosphate mud (fixed depending on refractory brick slump area).
1, the urgent damping down of blast furnace, closes all hot blast valves; Conduit enclosure 1 thickness is 10mm, and at race wind place opening conduits shell 1, the ignition-face area of the breach opened is 10m × 1.6m, remove the refractory brick 2 destroyed, remove the refractory brick 2 damaged, connect solid refractory brick 2 until expose, reach the breach of 12m × 1.2m.
2, clean out from outside by refractory matters such as the refractory brick 2 of slump in pipeline.
3, be that the rectangle that length and width are 12m × 1.5m made by the steel plate 4 of 3mm by thickness, wear iron wire at the two ends of this steel plate 4 and it sling along refractory brick 2 inwall, now steel plate 4 is in arc surfaced, and its internal diameter is φ 1100mm, equal with the internal diameter of refractory brick 2.Many parallel connecting reinforcements are set between the refractory brick 2 at breach two ends, steel plate 4 arranges an iron wire along the direction that pipeline extends and vertical ducting extends every 0.4m, and iron wire is connected to connecting reinforcement formed and hangs mould, ensure that steel plate 4 does not hang distortion.Lay one deck rock wool on steel plate 4 surface and get rid of silk rug 7 heat-blocking actions.
4, get rid of on silk rug 7 rock wool and build inner ring brick 8.Because the weight of mould material is very large, in order to ensure that steel plate 4 does not hang, when slump area is larger, be first built into the inner ring the first layer of refractory brick 2 correspondence with modular tile and pipeline brick as inner ring brick 8.In order to ensure firmly, preferably to ensure that inner ring turns 8 conjunction door places and builds by laying bricks or stones closely knit.Then adopt high alumina castable to pour into a mould with the two-layer corresponding position of refractory brick 2 outer shroud, stay every 2m when building and establish one 20mm dilatation joint.The facade place that mould material and refractory brick 2 connect stubble arranges dilatation joint, every limit 8mm.Lay bricks Shi Hemen place cannot closely knit connection time, also pour into a mould by mould material.By mould material vibration compacting, form pouring layer 3.
5, the thick machine-processed fiberboard 5 of one deck 20mm is laid on the surface of pouring layer 3.
6, with the shell steel plate 6 of the δ=10mm with conduit enclosure 1 equal thickness according to the notch size blanking that conduit enclosure 1 is opened, rolled φ=1956mm, 12m is wide × the long cambered surface of 12m, to recover the conduit enclosure 1 opened.Hooking at conduit enclosure 1 and the anchoring of refractory brick 2 place welding " V " type smears with spray material, health 12 hours after being laid by shell steel plate 6.
7, overall Dispose by grouting is carried out to the steel pipe of conduit enclosure 1 place of opening near its circumference.
In this is repaired, in order to ensure the closely knit of pouring layer 3, first can repair conduit enclosure 1, above conduit enclosure 1, opening 5 pouring holes that 30mm is square after repairing, build high alumina castable from this some holes.Layer 3 to be cast is repaired pouring hole after crossing preserving period again.
In the present embodiment, high alumina castable is in the same manner as in Example 1.
This engineering altogether lasts 48 hours from preparation of construction to completion of works, and compared with normal construction organization saves 50 hours.Work well to the overall overhaul of blast furnace system in 2010.
The present invention carries out repairing treatment running the outside refractory brick 2 to destroying of wind pipeline, the time of the stove that cools such as to eliminate, substantially reduces the time of blast furnace stopping maintenance, improve working efficiency, also reduce the financial loss brought by blowing out simultaneously; The method also proposes different processing schemes for different damage areas, both ensure that construction safety and the operating efficiency of operating worker, has also been applicable to various pipeline, can promote the use of.
Claims (6)
1. a Maintenance method for air leakage from pipeline of hot-air system of blast furnace, is characterized in that: carry out repairing treatment at the outside lining body to destruction of race wind pipeline and refractory brick, specifically comprise the steps:
1) blast furnace staying, closes all hot blast valves; In race wind place opening conduits shell (1), the ignition-face area of the conduit enclosure opened (1) is greater than the ignition-face area that refractory brick (2) comes off, and refractory brick (2) sled loosened the position that comes off falls;
2) refractory matter of slump in pipeline is cleaned out;
3) steel plate (4) that the cambered surface preparation come off according to refractory brick (2) is suitable with it, the ignition-face area of described steel plate (4) is greater than the ignition-face area that refractory brick (2) comes off; The steel plate prepared (4) is sling along refractory brick (2) inwall; When the area that comes off of refractory brick (2) is greater than 0.6m × 0.6m, lays one deck rock wool on the surface of the steel plate set up (4) and get rid of silk rug (7);
4) intact in steel plate (4) outer refractory brick (2) come off position vibration compacting of high alumina castable cast forms pouring layer (3); When the area that comes off of refractory brick (2) is greater than 0.6 m × 0.6m, first get rid of silk rug (7) upper block inner ring brick (8) rock wool, when inner ring brick (8) He Menchu can not lay bricks, carry out cast and vibration compacting formation pouring layer (3) with the refractory brick (2) that high alumina castable is intact in steel plate (4) outer;
5) at pouring layer (3) surface coverage one deck mechanism fiberboard (5);
6) conduit enclosure (1) opened is recovered with shell steel plate (6) blanking;
7) Dispose by grouting is carried out to the conduit enclosure (1) of maintenance section.
2., according to the Maintenance method for air leakage from pipeline of hot-air system of blast furnace described in claim 1, it is characterized in that steel plate used (4) thickness is 3mm when the area that comes off of refractory brick (2) is greater than 0.6m × 0.6m; When the area that comes off of refractory brick (2) is less than or equal to 0.6m × 0.6m, steel plate used (4) thickness is 2mm.
3. Maintenance method for air leakage from pipeline of hot-air system of blast furnace according to claim 1 and 2, is characterized in that the parameter of described high alumina castable requirement is: Al
2o
3>=65%, refractoriness>=1750 DEG C, refractoriness under load>=1500 DEG C, ultimate compression strength reaches 80-100MPa 1500 DEG C time, and folding strength reaches 13-18MPa 1500 DEG C time.
4. Maintenance method for air leakage from pipeline of hot-air system of blast furnace according to claim 1 and 2, is characterized in that the thickness of described machine-processed fiberboard (5) is 20mm.
5. Maintenance method for air leakage from pipeline of hot-air system of blast furnace according to claim 1 and 2, is characterized in that arranging dilatation joint between high alumina castable and refractory brick (2) in casting process.
6. Maintenance method for air leakage from pipeline of hot-air system of blast furnace according to claim 1 and 2, is characterized in that arranging dilatation joint according to predetermined space along expansion direction on pouring layer (3).
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| CN103276130B true CN103276130B (en) | 2015-10-28 |
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| CN103805723B (en) * | 2014-01-28 | 2016-03-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Blast-furnace hot-air pipeline transposition section refractory brick comes off quick prosthetic appliance and method |
| CN105003788A (en) * | 2015-06-12 | 2015-10-28 | 江苏永钢集团有限公司 | Repair method for burnt-red and air-leakage part of pipeline |
| CN105018664B (en) * | 2015-08-13 | 2017-06-16 | 广东韶钢松山股份有限公司 | A kind of blast funnace hot blast stove pipeline technique for rapidly repairing |
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| CN105483307B (en) * | 2015-12-07 | 2017-10-03 | 北京首钢股份有限公司 | Burner Inner guide rod restorative procedure in a kind of hot-blast stove repairing |
| CN106949337B (en) * | 2017-03-30 | 2020-02-04 | 中国十九冶集团有限公司 | Method for repairing collapsed liner of hot air pipeline |
| CN107385132A (en) * | 2017-08-14 | 2017-11-24 | 上海二十冶建设有限公司 | Hot-blast stove big-wall closes tweel block and exempts to process construction method |
| CN110953876A (en) * | 2019-12-18 | 2020-04-03 | 攀钢集团工程技术有限公司 | Method for repairing vertical kiln refractory layer |
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