CN103276130A - 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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- CN103276130A CN103276130A CN2013102059255A CN201310205925A CN103276130A CN 103276130 A CN103276130 A CN 103276130A CN 2013102059255 A CN2013102059255 A CN 2013102059255A CN 201310205925 A CN201310205925 A CN 201310205925A CN 103276130 A CN103276130 A CN 103276130A
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Abstract
The invention discloses a maintenance method for air leakage from a pipeline of a hot-air system of a blast furnace, and belongs to the treatment method of the air leakage from the pipeline. The method comprises the following steps of: firstly treating a position from which the air leaks; opening a notch on a fire-proofing tile; lifting a prepared steel plate at the notch along the inner wall of the fire-proofing tile; pouring a high-alumina castable along the steel plate, thereby forming a casting layer corresponding to the fire-proofing tile; shielding a machine-made fiberboard on the casting layer; and restoring a pipeline casing and grouting. According to the method, the damaged fire-proofing tile is repaired and treated outside the pipeline from which the air leaks, so that the time for wanting the furnace to be cooled is omitted. Thus, the maintenance time of the blast furnace in a shutdown manner is shortened greatly; the working efficiency is improved; and the economic loss caused by the furnace shutdown is reduced. For different damaging areas, the different treatment schemes are put forward, so that the construction safety and the construction efficiency of a worker are ensured. The method is also suitable for various pipelines and can be applied widely.
Description
Technical field
The present invention relates to the blast furnace technical field of construction
.
Background technology
In blast furnace production process, due to the impact of the quality of the welding quality of pipeline, masonry quality, material, many factors such as operation in production process, the hot-air system pipeline there will be pipeline to run the situation of wind.Usually to the processing scheme of hot-air system pipeline race wind, be: blast furnace staying, after the pipeline cooling, opening conduits ascertains the reason, and the staff enters in pipeline and again builds the refractory lining body destroyed while running wind by laying bricks or stones, repairs the pipeline shell, and mud jacking is processed.But in this processing mode, only cool stove one step just needs at least 3 days, adds other steps time used, and whole mending course need to take a long time, and has had a strong impact on production and the subsequent technique production of blast furnace.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of blast-furnace hot-air system pipeline to run the wind method for maintaining, and the method can shorten the time of blast furnace stopping maintenance greatly, increase work efficiency, and the financial loss that reduces to be 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 blast-furnace hot-air system pipeline runs the wind method for maintaining, comprises the steps:
1) blast furnace staying, close all hot blast valves; Running wind place opening conduits shell, the cambered surface area of the conduit enclosure of opening is greater than the cambered surface area that refractory brick comes off, and the loosening refractory brick in position that will come off is prized;
2) clean out the refractory matter of slump in pipeline;
3) the cambered surface preparation steel plate suitable with it come off according to refractory brick, the cambered surface area of described steel plate is greater than the cambered surface area that refractory brick comes off; The steel plate prepared is sling along the 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) in the steel plate outer, intact refractory brick pours into a mould with high alumina castable come off position vibration compacting formation pouring layer; When the area that comes off of refractory brick is greater than 0.6 m * 0.6m, first rock wool get rid of on silk rug build in the ring brick, when interior ring brick closes and locates to lay bricks with high alumina castable in the steel plate outer intact refractory brick pour into a mould also vibration compacting formation pouring layer;
5) at pouring layer surface coverage one deck mechanism fiberboard;
6) recover by the shell steel plate cutting conduit enclosure of opening;
7) conduit enclosure of maintenance section carried out to the mud jacking processing.
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 ℃, refractoriness under load>=1500 ℃, ultimate compression strength reaches 80-100MPa in the time of 1500 ℃, and folding strength reaches 13-18MPa in the time of 1500 ℃.
The thickness of described machine-processed fiberboard is 20mm.
Between high alumina castable and refractory brick, dilatation joint is set in casting process.
Along expansion direction, dilatation joint is set according to predetermined space on pouring layer.
The technical progress that adopts technique scheme to obtain is: the present invention carries out repairing treatment in race wind pipeline outside to lining body and the refractory brick destroyed, removed the time of waiting the stove that cools from, greatly shortened the time of blast furnace stopping maintenance, improve working efficiency, also reduced the financial loss of being brought by blowing out simultaneously; The method has also proposed different processing schemes for different damage areas, has both guaranteed construction safety and the operating efficiency of operating worker, also is applicable to various pipelines, can be promoted the use of.
The accompanying drawing explanation
Fig. 1 is the come off internal structure schematic diagram of the area time maintenance pipeline that is less than 0.6m*0.6m of refractory brick;
Fig. 2 is the come off internal structure schematic diagram of the area time maintenance pipeline that is greater than 0.6m*0.6m of refractory brick;
Wherein, 1, conduit enclosure, 2, refractory brick, 3, pouring layer, 4, steel plate, 5, machine-processed fiberboard, 6, the shell steel plate, 7, rock wool gets rid of silk rug, 8, interior ring brick.
Embodiment
Below with a plurality of embodiment, the present invention is described in detail.
Manufacturing district, Xinxing Cast Pipes Co., Ltd Wuan on May 6 in 2006 one ironmaking 1#460m
3wind is run suddenly at the blast-furnace hot-air surrounding pipes top, the crack of a 0.4m appears in conduit enclosure, rushed to repair construction equipment used according to method of the present invention: 1,1 of machine,massing, vibrating head 1 cover, welding tool 1 cover, gas welding unit 1 cover, mud jacking equipment 1 cover, 1.5m crowbar;
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, 1 ton of non-water system press-in material.
Concrete operation step is as follows:
1, the urgent damping down of blast furnace, close all hot blast valves; Conduit enclosure 1 thickness is 10mm, running wind place opening conduits shell 1, the cambered surface area of the breach of opening is 0.6m * 0.6m, remove the refractory brick 2 destroyed, find the breach that refractory brick 2 has come off about 0.3m * 0.4m, refractory brick loosening around this breach 2 sleds are fallen, until expose, connect solid refractory brick 2, the breach on last refractory brick 2 is expanded as 0.5m * 0.7m.
2, from outside by refractory matters such as the refractory brick of slump in pipeline 2, clean out.
3, the steel plate 4 that is 2mm by thickness is prepared into the rectangle of 0.7m * 0.9m, wear iron wire at the two ends of this steel plate 4 and by it inwall along refractory brick 2 sling.Refractory brick 2 integral body are annular, and the rectangular steel plates 4 of slinging will be curved along the inwall of refractory brick 2.While preparing steel plate 4, the rectangular area of steel plate 4 should be greater than the cambered surface area of the breach of opening on refractory brick 2, and minimum is about 120% of breach area usually, 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 that guarantees its load-bearing, more carefully better.
4, with high alumina castable, on refractory brick 2 comes off the steel plate 4 of position, poured into a mould, vibration compacting, form pouring layer 3; Pouring layer 3 just is equivalent to refractory brick 2, so the thickness of pouring layer 3 should be not less than the thickness (while being less than can with machine-processed fiberboard 5 polishings) of refractory brick 2 usually.
5, at pouring layer 3 surface coverage one deck 20mm mechanism fiberboards 5.
6, the shell steel plate 6 that is 10mm with thickness is according to the breach blanking of opening on conduit enclosure 1, to recover the conduit enclosure 1 of opening.
7, near steel pipe 5m around conduit enclosure 1 place of opening is carried out to the mud jacking processing.
The parameter that described high alumina castable requires in the present embodiment is: Al
2o
3>=65%, refractoriness>=1750 ℃, refractoriness under load>=1500 ℃, ultimate compression strength reaches 80-100MPa in the time of 1500 ℃, and folding strength reaches 13-18MPa in the time of 1500 ℃.And between high alumina castable and refractory brick, dilatation joint is set in casting process, on pouring layer, according to the every 50cm of predetermined space, the dilatation joint of a 20mm is set along expansion direction.
In this embodiment, from blast furnace, stop production to resuming production 22 hours consuming time altogether.Repairing blast furnace so far still produces normally.If processed according to scheme in the past, only the pipeline cooling reaches into people's condition and just needs 60 hours, and reaching working condition needs 80 hours.Method of the present invention has been saved 58 hours, and blast furnace is on average per hour produced approximately 66 tons of pig iron, according to 300 yuan of profits of one ton of pig iron, calculates, and can reduce the loss: 300 yuan * 66 tons/hour * 58 hours=1148400 yuan.
Xinxing Cast Pipes Co., Ltd two ironmaking on August 17th, 2007 positions, 2# blast furnace 2# hotblast stove junctions are through production operation for many years, and position, 2# hotblast stove junctions occurs running wind, and 1# and 2# hotblast stove interlude occur that place's pipeline burns red phenomenon.Open and run the phenomenon that there is the square slump brick of about 500mm*500mm in discovery race wind position, Ji Hongguan position, wind position, the about 100mm of the whole sinking of top, red pipe position refractory brick.Infer thus from 2# hotblast stove to the about 10m long pipeline of vertical tube direction top lining body and destroyed, need carry out large repairs.
Rushed to repair construction equipment used according to method of the present invention: 1,1 of machine,massing, vibrating head 1 cover, welding tool 1 cover, gas welding unit 1 cover, mud jacking equipment 1 cover, 1.5m crowbar.
In the steel plate of construction material: δ=3mm, diameter 1.2mm iron wire 50m, the shell steel plate with the 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, 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, close all hot blast valves; Conduit enclosure 1 thickness is 10mm, is running wind place opening conduits shell 1, and the cambered surface area of the breach of opening is 10m * 1.6m, remove the refractory brick 2 destroyed, remove the refractory brick 2 damaged, until expose, connect solid refractory brick 2, reach the breach of 12m * 1.2m.
2, from outside by refractory matters such as the refractory brick of slump in pipeline 2, clean out.
3, the steel plate 4 that is 3mm by thickness is made the rectangle that length and width are 12m * 1.5m, wears iron wire at the two ends of this steel plate 4 and it is sling along refractory brick 2 inwalls, and now steel plate 4 is arc surfaced, and its internal diameter is φ 1100mm, with the internal diameter of refractory brick 2, equates.Many parallel connecting reinforcements are set between the refractory brick 2 at breach two ends, every 0.4m, an iron wire is set along the direction that pipeline extends and vertical ducting extends on steel plate 4, and iron wire is connected on connecting reinforcement to form hangs mould, guarantee steel plate 4 distortion that do not hang.Lay one deck rock wool on steel plate 4 surfaces and get rid of 7 heat-blocking actions of silk rug.
4, get rid of on silk rug 7 and encircle brick 8 in block rock wool.Because the weight of mould material is very large, in order to guarantee steel plate 4, do not hang, when the slump area is larger, at first with modular tile and pipeline brick, be built into the interior ring the first layer of refractory brick 2 correspondences as interior ring brick 8.In order to guarantee firmly, in preferably guaranteeing ring turn 8 close locate to build by laying bricks or stones closely knit.Then adopt the high alumina castable cast with the refractory brick 2 two-layer corresponding positions of outer shroud, while building, every 2m, stay and establish the 20mm dilatation joint one.The facade place that mould material and refractory brick 2 connect stubble arranges dilatation joint, every limit 8mm.Lay bricks the Shi Hemen place can't closely knit connection the time, also will be poured into a mould by mould material.By the mould material vibration compacting, form pouring layer 3.
5, lay the machine-processed fiberboard 5 that one deck 20mm is thick on the surface of pouring layer 3.
6, using shell steel plate 6 with the δ=10mm of conduit enclosure 1 equal thickness according to the notch size blanking of opening on conduit enclosure 1, it is rolled to φ=1956mm, 12m is wide * the long cambered surface of 12m, to recover the conduit enclosure 1 of opening.At conduit enclosure 1 and refractory brick 2 place's welding " V " type anchorings hooks, smear with spray material, after shell steel plate 6 is laid, health is 12 hours.
7, near steel pipe around conduit enclosure 1 place of opening is carried out to whole mud jacking processing.
In this is repaired, in order to guarantee the closely knit of pouring layer 3, can at first to conduit enclosure 1, be repaired, open 5 square pouring holes of 30mm after repairing above conduit enclosure 1, build high alumina castable from these holes.After crossing preserving period, again pouring hole is repaired on layer 3 to be cast.
In the present embodiment, high alumina castable is in the same manner as in Example 1.
This engineering is altogether lasted 48 hours from the preparation of construction to the completion of works, and the compared with normal construction organization is saved 50 hours.Work well to the whole overhaul of blast furnace system in 2010.
The present invention carries out repairing treatment in race wind pipeline outside to the refractory brick 2 destroyed, and has removed the time of waiting the stove that cools from, has greatly shortened the time of blast furnace stopping maintenance, has improved working efficiency, has also reduced the financial loss of being brought by blowing out simultaneously; The method has also proposed different processing schemes for different damage areas, has both guaranteed construction safety and the operating efficiency of operating worker, also is applicable to various pipelines, can be promoted the use of.
Claims (6)
1. a blast-furnace hot-air system pipeline runs the wind method for maintaining, it is characterized in that comprising the steps:
1) blast furnace staying, close all hot blast valves; Running wind place opening conduits shell (1), the cambered surface area of the conduit enclosure of opening (1) is greater than the cambered surface area that refractory brick (2) comes off, and the loosening refractory brick in position (2) that will come off sled falls;
2) clean out the refractory matter of slump in pipeline;
3) the cambered surface preparation steel plate (4) suitable with it come off according to refractory brick (2), the cambered surface area of described steel plate (4) is greater than the cambered surface area that refractory brick (2) comes off; The steel plate (4) prepared 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) in steel plate (4) outer, intact refractory brick (2) pours into a mould with high alumina castable come off position vibration compacting formation pouring layer (3); When the area that comes off of refractory brick (2) is greater than 0.6 m * 0.6m, first ring brick (8) in rock wool gets rid of that silk rug (7) is upper and builds, when interior ring brick (8) He Menchu can not lay bricks with high alumina castable in steel plate (4) outer intact refractory brick (2) pour into a mould also vibration compacting formation pouring layer (3);
5) at pouring layer (3) surface coverage one deck mechanism fiberboard (5);
6) recover with shell steel plate (6) blanking the conduit enclosure (1) of opening;
7) conduit enclosure (1) of maintenance section carried out to the mud jacking processing.
2. blast-furnace hot-air system pipeline according to claim 1 runs the wind method for maintaining, and while it is characterized in that the area that comes off when refractory brick (2) is greater than 0.6m * 0.6m, steel plate used (4) thickness is 3mm; 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. blast-furnace hot-air system pipeline according to claim 1 and 2 runs the wind method for maintaining, it is characterized in that the parameter of described high alumina castable requirement is: Al
2o
3>=65%, refractoriness>=1750 ℃, refractoriness under load>=1500 ℃, ultimate compression strength reaches 80-100MPa in the time of 1500 ℃, and folding strength reaches 13-18MPa in the time of 1500 ℃.
4. blast-furnace hot-air system pipeline according to claim 1 and 2 runs the wind method for maintaining, and the thickness that it is characterized in that described machine-processed fiberboard (5) is 20mm.
5. blast-furnace hot-air system pipeline according to claim 1 and 2 runs the wind method for maintaining, it is characterized in that between high alumina castable and refractory brick (2), dilatation joint being set in casting process.
6. blast-furnace hot-air system pipeline according to claim 1 and 2 runs the wind method for maintaining, it is characterized in that above according to predetermined space, along expansion direction, dilatation joint being set at pouring layer (3).
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Cited By (8)
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| CN103805723A (en) * | 2014-01-28 | 2014-05-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Rapid blast furnace hot-air pipeline cross section refractory brick dropping repairing equipment 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 |
| CN105018664A (en) * | 2015-08-13 | 2015-11-04 | 广东韶钢松山股份有限公司 | Rapid repairing technology of blast furnace hot blast stove pipeline |
| CN105441618A (en) * | 2015-12-07 | 2016-03-30 | 北京首钢股份有限公司 | Local repairing method for blast furnace hot blast stove vault |
| CN105483307A (en) * | 2015-12-07 | 2016-04-13 | 北京首钢股份有限公司 | Repairing method for flow guiding bars in combustor during hot blast heater repairing |
| CN106949337A (en) * | 2017-03-30 | 2017-07-14 | 中国十九冶集团有限公司 | A kind of hot air duct collapses the restorative procedure of liner |
| 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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| CN103805723A (en) * | 2014-01-28 | 2014-05-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Rapid blast furnace hot-air pipeline cross section refractory brick dropping repairing equipment and method |
| 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 |
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| CN105018664A (en) * | 2015-08-13 | 2015-11-04 | 广东韶钢松山股份有限公司 | Rapid repairing technology of blast furnace hot blast stove 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 |
| CN105441618A (en) * | 2015-12-07 | 2016-03-30 | 北京首钢股份有限公司 | Local repairing method for blast furnace hot blast stove vault |
| CN105483307A (en) * | 2015-12-07 | 2016-04-13 | 北京首钢股份有限公司 | Repairing method for flow guiding bars in combustor during hot blast heater repairing |
| 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 |
| CN106949337A (en) * | 2017-03-30 | 2017-07-14 | 中国十九冶集团有限公司 | A kind of hot air duct collapses the restorative procedure of liner |
| 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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