CN103292599A - Method for repairing housing of hot blast heater in late service period - Google Patents
Method for repairing housing of hot blast heater in late service period Download PDFInfo
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- CN103292599A CN103292599A CN2013102062671A CN201310206267A CN103292599A CN 103292599 A CN103292599 A CN 103292599A CN 2013102062671 A CN2013102062671 A CN 2013102062671A CN 201310206267 A CN201310206267 A CN 201310206267A CN 103292599 A CN103292599 A CN 103292599A
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Abstract
The invention relates to a method for repairing a housing of a hot blast heater in late service period. The method includes steps of I, restoring a housing crack: welding two supports on two outer sides of the crack respectively, adopting two jacks to transversely support between the supports and parts and to jack the cracking crack back from two sides; II, welding the crack: adopting an angle grinder to clean a breach and a crevasse with an angle, bottoming an Austentic 002 stainless steel electrode in the crack and welding into a joint by a common welding electrode; III, reinforcing the housing: arranging an annular belt at the housing crack and hooping the housing; IV, drilling a manhole and scooping residual brick: drilling a circular manhole not smaller than DN600mm in a burned position of the housing and scooping the burned residual brick; V, casting a formwork: blowing the manhole by a compressed air pipe, and fastening a circular steel plate at a hole of the housing and casting; VI, roasting cast materials. By the method for repairing the housing of the hot blast heater in the late service period, the service life of the housing of the hot blast heater is prolonged.
Description
Technical field
The present invention relates to a kind of repair method of hot-blast stove stove labour later stage stove skin, say it is hot-blast stove stove labour later stage stove skin cracking in detail, burn red repair method.
Background technology
Still have a large amount of old-fashioned internal combustion stoves in the existing blast furnace, so far produced the time in 22 years after particularly the hot-blast stove of the applicant blast furnace was gone into operation from 1991, the distortion of furnace roof stove skin produces irregular cracks, a large amount of crackings, in 2010, the transverse crack 1.3m that splits of manhole place that constructs around the hot-blast stove furnace roof manhole, vertically 1.1m is " door " crack of type shape, and race wind is serious.The repair method of existing hot-blast stove stove labour later stage stove skin adopts the conventional process mode of splitting and just carrying out direct repair welding at the crack that ftractures usually.This repairing mode causes this type of accident easily, and the phenomenon of splitting again soon even after a while after living again and again takes place, welds; Steel fatigue, intensity reduction finally appear, the situation that is difficult to weld.
Summary of the invention
Use as a servant the deficiency of the repair method of later stage stove skin in order to overcome existing hot-blast stove stove, the invention provides a kind of distortion of hot-blast stove stove skin and method of cracking of repairing, thereby prolonged hot-blast stove stove skin service life, prevented repeatedly cracking, realized that hot-blast stove stove labour later stage safety and stability produces.
It repairs the disposal preparation process: the hot-blast stove to cracking stops, and closes exhaust gas valve all valves in addition; From the outside it is run wind with compressed air hose or axial flow blower earlier and carry out local cooling, place under repair more on every side.
The repair method of this hot-blast stove stove labour later stage stove skin comprises following sequential steps:
IResetting of stove skin crack
Behind the stove skin crack, lateral surface in both sides, place, stove skin crack respectively welds a bracing frame that is used for restoring stove skin crack, respectively look for parts that are connected with ground (as railing on every side) in the both sides in crack, each laterally withstands between bracing frame and the parts with one pair of jack, two jack on both sides, crack, rely on bracing frame, the crack of cracking is pushed up back with jack the stove skin is resetted.
IIWeld crack
Open wide, 30 °～60 ° cuts of spending angles of 8～12mm with angle grinding machine cleaning breach and along the breach of cracking direction earlier; Adopt 002 stainless steel electrode difficult to understand in the crack, to feel secure then, weld a scarfing cinder one time (preventing from forming pore, residual welding slag), weld after twice, be welded into weld seam with common welding rod, when welding, do not allowed slag inclusion, hole, undercut and lack of penetration phenomenon, wanted sequential welding during welding, will once weld thoroughly for weld seam.
IIIStove skin reinforcement measure
Locate to beat the endless belt at stove skin crack (weld seam that namely has been welded into), do banded tractive with thick 8～10 mm, wide 50～60mm steel plate from stove skin cracking, wale the stove skin, when preventing that stove skin crack from tearing the perk of stove skin from crack race wind, even the generation of accident.
IVOpen manhole and dig residual brick
Burn red place cuts out the circular manhole that appearance and size is not less than DN 600mm with cutting holes machine after at the stove skin, dig up and burn red residual brick, blow, reduce temperature on every side with compressed air, dig motionless, the stable internal layer that intensity is arranged up to seeing with scuppit.
VFormwork is built
Purge the manhole place clean with compressed air hose, appearance and size is buckled in stove skin perforate (being manhole) greater than the circular steel plate (circular steel plate is arc-shaped bend also) of circular manhole to be located, circular steel plate both sides and the spot welding of manhole outer, a blast pipe that is not less than DN25 is all adorned in two ends up and down in the outside, and respectively weld a valve, when building from bottom to top, the minute-pressure influent stream, treat to stop to be pressed into material when the top blast pipe flows out pouring material, prove that inside built completely.
The requirement of pouring material
A. line rate of change: 1450 ℃ * 3h ± 0.5%
B. rupture strength: 1450 ℃ * 3h 〉=5.0MPa
C. bulk density: 〉=2.8g/cm
3
D. compressive resistance: 110 ℃ * 24h 〉=20MPa
1450℃×3h ≥30MPa
E. cold compression strength: (dry back 110 ℃) 〉=15.0MPa
F. bulk density: (dry back 110 ℃) average 〉=1.85 g/cm
3
G. chemical index: Al
2O
3〉=60% SIC 〉=8% CaO≤8% Fe
2O
3≤ 6% granularity≤6mm
VIThe baking pouring material
0--------300℃ ≥3h
300------600℃ ≥3h
600-----900℃ ≥2 h
900-----1200℃ ≥1 h。
The repair method of above-mentioned hot-blast stove stove labour later stage stove skin is characterized in that: in step
IIDuring weld crack, open wide, the 45 ° of cuts of spending angles of 10mm with angle grinding machine cleaning breach and along the breach of cracking direction;
In step
IIIDuring stove skin reinforcement measure, the endless belt is with thick 10 mm, wide 60mm steel plate.
Beneficial effect:
After adopting the repair method of this hot-blast stove stove labour later stage stove skin, stove skin crack is under control, particularly effect is splendid during furnace retaining, use 4 years stove skins not occur burning red and crack phenomenon again through practice, stop distortion and the cracking of stove skin, prolonged the service life of stove skin, guaranteed the safety in production in hot-blast stove stove labour later stage, finished the task of furnace retaining, made the hot-blast stove in the stove labour later stage blast furnace stopping of being on active service safely.
Description of drawings
Fig. 1 is the schematic diagram that resets in the stove skin crack of embodiments of the invention.
Fig. 2 is circular steel plate front view.
Fig. 3 is the vertical view corresponding with Fig. 2.
Among the above-mentioned figure:
1-stove skin 2-left railing 3-left jack 4-left bracing frame
5-right bracing frame 6-right jack 7-right railing 8-crack
9-circular steel plate.
The specific embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is described, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment
What present embodiment was repaired is that 1650 cubic metres of blast furnaces of volume are supporting, has used the iron-making heat wind furnace in 22 years, and ftractureed 4mm wide crack and stove skin of stove skin burns red.
Present embodiment comprises following sequential steps:
IResetting of stove skin crack
This hot-blast stove is stopped, close exhaust gas valve all valves in addition; From the outside it is run wind with compressed air hose and carry out local cooling on every side.
The stove skin 1 of the hot-blast stove that present embodiment the is revised wide crack 8 of 4mm of having ftractureed, long 1200mm, see Fig. 1, left its structure of bracing frame 4(that lateral surface welding in the left side in stove skin 1 crack 8 is used for restoring stove skin 1 is original " bracket "), the right bracing frame 5 that is used for restoring stove skin 1 in the lateral surface welding on the right side in stove skin 1 crack 8, the left railing 2(of left bracing frame 4 and fence namely and the fixing parts in ground) between left jack 3 is installed, right jack 6 is installed between the right railing 7 of right bracing frame 5 and fence, rely on bracing frame and railing, part on the right side with left jack 3 and right jack 6 and not push up left bracing frame 4 and right bracing frame 5 from the both sides of the weld seam that splits, the crack 8 of the stove skin 1 of cracking is pushed up back stove skin 1 is resetted.
IIWeld crack
Open the cut that 1cm is wide, be miter angle with angle grinding machine cleaning crack 8 and along the breach of cracking direction; Adopt 002 stainless steel electrode difficult to understand to be processed into cut at crack 8(then) in the bottoming, weld a scarfing cinder one time (preventing from forming pore, residual welding slag), weld after twice, be welded as weld seam with ordinary carbon steel J422 welding rod, when welding, slag inclusion, hole, undercut and lack of penetration phenomenon can not be arranged, want sequential welding during welding, will once weld thoroughly for weld seam.
IIIStove skin reinforcement measure
1 crack 8(has been welded into weld seam at the stove skin) locate to beat the endless belt, steel plate with the wide 60mm of thick 10mm is done annular solder (reaching the purpose of banded tractive) from the crack 8 of stove skin 1, wale stove skin 1, wind was run in 1 perk of stove skin when the weld seam that prevents stove skin 1 was torn from the crack, even the generation of accident.
IVOpen manhole watt residual brick
Burn red place at stove skin 1 and go out with the cutting machine cut to dig up and burn red residual brick behind the circular manhole of shape dimension D N 600mm, blow, reduce temperature on every side with compressed air, dig motionless, the stable internal layer that intensity is arranged up to seeing with scuppit.
VFormwork is built
Purge the manhole of stove skin 1 clean with compressed air hose, with the circular steel plate 8 of appearance and size greater than circular port, see Fig. 2 and Fig. 3, be buckled in the tapping of stove skin 1, circular steel plate 8 both sides and the spot welding of manhole outer, the blast pipe of a DN25 is adorned at two ends about the outside, and respectively weld a valve, when building from bottom to top, the minute-pressure influent stream, treat to stop to be pressed into material when the top blast pipe flows out pouring material, prove that inside built full.
The technical parameter of pouring material reaches following requirement:
A. line rate of change: 1450 ℃ * 3h ± 0.5%
B. rupture strength: 1450 ℃ * 3h 5.2MPa
C. bulk density: 2.8g/cm
3
D. compressive resistance: 110 ℃ * 24h 21MPa
1450℃×3h 31MPa
E. cold compression strength: (dry back 110 ℃) 15.1MPa
F. bulk density: (dry back 110 ℃) average 1.86 g/cm
3
G. chemical index: Al
2O
362% SiC, 8% CaO, 8% Fe
2O
36% granularity≤6mm
VIThe baking pouring material
0--------300℃ 3h
300------600℃ 3h
600-----900℃ 2 h
900-----1200℃ 1 h。
Claims (3)
1. the repair method of hot-blast stove stove labour later stage stove skin, it comprises following sequential steps:
IResetting of stove skin crack
Behind the stove skin crack, lateral surface in both sides, place, stove skin crack respectively welds a bracing frame that is used for restoring stove skin crack, respectively look for parts that are connected with ground in the both sides in crack, each laterally withstands between bracing frame and the parts with one pair of jack, two jack on both sides, crack, rely on bracing frame, the crack of cracking is pushed up back with jack the stove skin is resetted;
IIWeld crack
Open wide, 30 °～60 ° cuts of spending angles of 8～12mm with angle grinding machine cleaning breach and along the breach of cracking direction earlier; Adopt 002 stainless steel electrode difficult to understand in the crack, to feel secure then, weld a scarfing cinder one time, prevent from forming pore, residual welding slag; Weld after twice, be welded into weld seam with common welding rod, when welding, do not allowed slag inclusion, hole, undercut and lack of penetration phenomenon, want sequential welding during welding, will once weld thoroughly for weld seam;
IIIStove skin reinforcement measure
Beat the endless belt at stove skin crack place, do banded tractive with thick 8～10 mm, wide 50～60mm steel plate from stove skin cracking, wale the stove skin, the perk of stove skin is from crack race wind when preventing that stove skin crack from tearing;
IVOpen manhole and dig residual brick
Burn red place cuts out the circular manhole that appearance and size is not less than DN 600mm with cutting holes machine after at the stove skin, dig up and burn red residual brick, blow, reduce temperature on every side with compressed air, up to see dig with scuppit motionless;
VFormwork is built
Purge the manhole place clean with compressed air hose, appearance and size is buckled in stove skin tapping greater than the circular steel plate of circular manhole, circular steel plate both sides and the spot welding of manhole outer, a blast pipe that is not less than DN25 is all adorned in two ends up and down in the outside, and respectively weld a valve, when building from bottom to top, the minute-pressure influent stream, treat to stop to be pressed into material when the top blast pipe flows out pouring material, prove that inside built completely;
VIThe baking pouring material
0--------300℃ ≥3h
300------600℃ ≥3h
600-----900℃ ≥2 h
900-----1200℃ ≥1 h。
2. the repair method of hot-blast stove stove labour later stage stove skin according to claim 1 is characterized in that in step
VThe requirement of described pouring material is:
A. line rate of change: 1450 ℃ * 3h ± 0.5%
B. rupture strength: 1450 ℃ * 3h 〉=5.0MPa
C. bulk density: 〉=2.8g/cm
3
D. compressive resistance: 110 ℃ * 24h 〉=20MPa
1450℃×3h ≥30MPa
E. cold compression strength: 〉=15.0MPa
F. bulk density: 〉=1.85 g/cm
3
G. chemical index: Al
2O
3〉=60% SIC 〉=8% CaO≤8% Fe
2O
3≤ 6% granularity≤6mm.
3. the repair method of hot-blast stove stove labour later stage stove skin according to claim 1 and 2 is characterized in that: in step
IIDuring weld crack, open wide, the 45 ° of cuts of spending angles of 10mm with angle grinding machine cleaning breach and along the breach of cracking direction;
In step
IIIDuring stove skin reinforcement measure, the endless belt is with thick 10 mm, wide 60mm steel plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310206267.1A CN103292599B (en) | 2013-05-30 | 2013-05-30 | Method for repairing housing of hot blast heater in late service period |
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|---|---|---|---|
| CN201310206267.1A CN103292599B (en) | 2013-05-30 | 2013-05-30 | Method for repairing housing of hot blast heater in late service period |
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|---|---|
| CN103292599A true CN103292599A (en) | 2013-09-11 |
| CN103292599B CN103292599B (en) | 2015-03-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106693616A (en) * | 2015-11-17 | 2017-05-24 | 鞍钢股份有限公司 | Method for repairing inner wall of acid-making absorption tower |
| CN109079358A (en) * | 2018-08-01 | 2018-12-25 | 北京首钢股份有限公司 | A kind of blast funnace hot blast stove vault steel shell weld seam online strengthening method |
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| CN101613608A (en) * | 2009-07-13 | 2009-12-30 | 山西太钢不锈钢股份有限公司 | The sealing method of coke furnace charging hole seat |
| CN102087074A (en) * | 2009-12-08 | 2011-06-08 | 鞍钢集团矿业公司 | Method for constructing refractory materials at pellet rotary kiln bellow port |
| KR20110076590A (en) * | 2009-12-29 | 2011-07-06 | 주식회사 포스코 | Method for hot-refairing lining refractories in a blast furnance |
| CN102417941A (en) * | 2011-11-14 | 2012-04-18 | 山西太钢不锈钢股份有限公司 | Maintenance method and system of blast furnace stack |
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2013
- 2013-05-30 CN CN201310206267.1A patent/CN103292599B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613608A (en) * | 2009-07-13 | 2009-12-30 | 山西太钢不锈钢股份有限公司 | The sealing method of coke furnace charging hole seat |
| CN102087074A (en) * | 2009-12-08 | 2011-06-08 | 鞍钢集团矿业公司 | Method for constructing refractory materials at pellet rotary kiln bellow port |
| KR20110076590A (en) * | 2009-12-29 | 2011-07-06 | 주식회사 포스코 | Method for hot-refairing lining refractories in a blast furnance |
| CN102417941A (en) * | 2011-11-14 | 2012-04-18 | 山西太钢不锈钢股份有限公司 | Maintenance method and system of blast furnace stack |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106693616A (en) * | 2015-11-17 | 2017-05-24 | 鞍钢股份有限公司 | Method for repairing inner wall of acid-making absorption tower |
| CN106693616B (en) * | 2015-11-17 | 2019-04-26 | 鞍钢股份有限公司 | A kind of relieving haperacidity absorption inner wall of tower restorative procedure |
| CN109079358A (en) * | 2018-08-01 | 2018-12-25 | 北京首钢股份有限公司 | A kind of blast funnace hot blast stove vault steel shell weld seam online strengthening method |
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| CN103292599B (en) | 2015-03-25 |
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