CN106435087A - Sectional assembling and mounting method for converter vaporization flue - Google Patents

Sectional assembling and mounting method for converter vaporization flue Download PDF

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Publication number
CN106435087A
CN106435087A CN201610744276.XA CN201610744276A CN106435087A CN 106435087 A CN106435087 A CN 106435087A CN 201610744276 A CN201610744276 A CN 201610744276A CN 106435087 A CN106435087 A CN 106435087A
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China
Prior art keywords
flue
oblique
lifting
assembly
suspension hook
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CN201610744276.XA
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Chinese (zh)
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CN106435087B (en
Inventor
孔炯
周金龙
施光涛
金仁才
徐峥
翁勇荣
汪柱兵
琚志海
王国军
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中国十七冶集团有限公司
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • C21C5/38Removal of waste gases or dust
    • C21C5/40Offtakes or separating apparatus for converter waste gases or dust
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • C21C5/42Constructional features of converters
    • C21C5/46Details or accessories
    • C21C5/4686Vehicles for supporting and transporting a converter vessel
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The invention discloses a sectional assembling and mounting method for a converter vaporization flue, wherein the mounting method comprises the following construction steps: step I, carrying out construction preparation; step II, assembling, wherein a vaporization cooling flue basically enters a site in a sectional mode as a result of a large diameter, an inclined section II and an inclined section II are combined together as well as a corner flue I and a corner flue II are assembled together for reducing safety accidents for working high above the ground under a condition that turning is permitted in a plant structure space; and step III: hoisting, wherein the inclined section assembly is firstly hoisted, and the corner section assembly is hoisted after the inclined section assembly is hoisted. The sectional assembling and mounting method disclosed by the invention has the advantage of saving use of large hoisting equipment, improving efficiency of labor, reducing labor intensity, avoiding or reducing risks caused by working high above the ground, and improving mounting control risks.

Description

A kind of converter vaporization flue piecewise combination installation method

Technical field

The present invention relates to a kind of construction method, in particular, relate to a kind of converter vaporization flue piecewise combination and install Method.

Background technology

Gasification cooling flue system is the important component part of converter, as converter flue reclaim key equipment, its Have direct lift-on/lift-off system and beam engineering method on installation method, but in view of the factors such as evaporated flue own dimensions length, weight are big impact, vapour Change flue segmentation to march into the arena and install, how to ensure the weight that the installation quality of evaporated flue and raising installation effectiveness are considerations Point.At present, existing do not arrive in China national patent office searching with regard to a kind of converter vaporization flue piecewise combination installation method;But There is the Patent design of similar title;" a kind of converter vaporization flue row issuing on 02 26th, 2014 such as China national Patent Office The construction method of dirty system ", application number:CN201310637261.X, it mainly introduces by modification blow-off line layout, Improve valve blowdown mode to reach to optimize evaporated flue contaminant removal effectiveness.Valve is avoided human body significant points and is installed, and can reach Improving the purpose of security, the centralized layout of valve has is easy to pipeline valve distribution, personal observations convenient to operate and erect-position Advantage, installs quick draining valves after gate valve more respectively additional, at ordinary times that gate valve is normally opened, improves blowdown effect by operation quick draining valves Rate, can carry out on-call maintenance or replacing with closing gate valve when quick draining valves breaks down or leaks.But at present, also do not have A kind of converter vaporization flue piecewise combination installation method.

Can produce a large amount of high-temperature flue gas in steelmaking process, its main component is carbon monoxide.Coal gas of converter calorific capacity up to 7524-9196kJ, is a kind of first-class fuel, can be as the fuel of the equipment such as heater for rolling steel, lime sleeve kiln, ladle baking. Simultaneously possibly together with the dust of a large amount of high Fe contents in flue gas, can be as the superior raw material of sintering deposit after collection.In addition, high-temperature flue gas By heat exchange recyclable a large amount of steam again, utilization of steam is very wide, can be not only used for producing, can be used for again living.Therefore, to converter Flue gas using energy source meaning is very great.If these high-temperature flue gas do not reclaim, distribute and can produce serious dirt in workshop and air Dye, jeopardizes health of human body and agricultural production, can disturb electrical network, TV and communication etc. simultaneously.In pneumatic steelmaking, steel-making is produced The process of flue gas is one of outstanding feature of steel mill Environmental Protection Level, and the recycling and reuse of coal gas and steam are also that its power consumption refers to Target key factor, and the steam of pneumatic steelmaking and coal-gas recovering are to be realized by off-gas recovery cleaning system.

Content of the invention

The present invention is directed to the deficiencies in the prior art, and a kind of converter vaporization flue piecewise combination installation method is provided.Solve Its progress occurring in steel-making factory building Steel Structure Installation linking, quality, safety problem.

A kind of converter vaporization flue piecewise combination installation method of the present invention, described installation method comprises the steps:

Step one, preparation of construction;

1.1 fabricating yard Horizon seamlesses are real, meet the condition of the place level of gasification cooling flue sectional;

1.2 welding equipments are marched into the arena, and all prepare to put in place to the closing measure material of evaporated flue in welding process;

1.3 carry out qualification of welding procedure to material according to the rules, assign weld job guiding book, and hand over welding procedure The end;

1.4 wldings leave in special storehouse, and storehouse is dried, well-ventilated;

1.5 shoulder pole for hoistings prepare to put in place;

Steel construction in gasification cooling flue hoisting process, according to lifting requirements, wouldn't be installed by 1.6, the girder of structural stability Must install;

1.7 arrange gasification cooling flue according to the requirement of factory building columns alignment on steel structure girder installs center line and absolute altitude;

Step 2, organize right

Gasification cooling flue, owing to diameter is big, the state of marching into the arena substantially is that segmentation is marched into the arena, it is contemplated that reduce the safety of work high above the ground, In the case of turning permission in mill construction space, oblique section two and oblique section three are fitted together, by corner flue one and corner Flue two fits together.

2.1 are lifted on oblique section two and oblique section three on the ground of smooth compacting, and level is put, and control oblique section two and oblique section The levelness of three, centrad, parameter centering starts after finishing in ground welding;

2.2 lift corner flue one and corner flue two to the ground of smooth compacting, and level is put, at corner flue one With corner flue two groups to during control the levelness of oblique section two and oblique section three well, center distance, parameter centering finish after weldering Connect;

Step 3:Lifting

First 3.1 lift oblique section assembly, support beam stage+module welding finish after, utilize crane A suspension hook hang up properly steel wire rope, Shoulder pole for hoisting lifts, and keeps the uniform force of steel wire rope;When whole work are whole after setting completed, slowly hoist crane A suspension hook, vertically slings, when oblique section assembly exceed steel-making high across technique platform after insertion support beam platform from bottom to top in, After oblique section assembly hypomere runs through support beam platform, crane B suspension hook is utilized slowly to adjust the angle of oblique section assembly from downside, Make it be located in smoothly on support beam platform, after angle adjustment finishes, platform one arranges temporary support mechanism, keep tiltedly Section assembly fixed angle;

3.2 after the lifting of oblique section assembly completes, and starts to lift corner segments assembly, after corner segments assembly is completed, Start with crane A suspension hook corner segments assembly is sling to slowly fall on support beam platform, stable after decoupling device;

3.3 lift oblique section one subsequently, owing to oblique section one is in factory building platform, it is impossible to directly lift, use Relay Method lifting, first By crane B suspension hook, oblique section one is sling, before slinging respectively with lifting rope one and lifting rope two be arranged on oblique section one upper, On four hangers of lower both sides, on the hanger of upside, separately pre-set a reserved rope, and arrange on platform up Elevator pulley combination;When the oblique section one of crane B suspension hook lifting is to the platform limit, places the suspension hook of elevator pulley combination, hang up pre- Stay rope, then pass through elevator pulley combination and crane B suspension hook synchronous matching by place for oblique section one;In place finish after start welding tiltedly Section one and oblique section assembly;

The mobile flue of 3.4 converter evaporation cooling air flues is monoblock type, before lifting, first installs mobile flue track, installs It is mobile trolley used that welding lifts mobile flue after finishing again, and centering finishes rear integral hoisting gasification cooling flue mobile flue, levelling Centering, installation terminates.

Further;Making place in described step one needs smooth compacting, it is ensured that major diameter, large-tonnage equipment deposit and It is not easy deformation.

Further;Shoulder pole for hoisting in described step one uses H profile steel to make, and in shoulder pole for hoisting, spacing 500mm sets Put long stiffened panel, gusset thickness 16mm;Total length is 5m.

Further;Longitudinal direction and transverse center that gasification cooling flue is set out according to factory building columns alignment in described step one Line.

Further;The special storehouse that wlding in described step one is deposited, is provided with thermometer and hygrometer, and environment temperature is not Less than 5 DEG C, air humidity is maintained at less than 50%;Wlding is kept away by species, the trade mark, specification, the stacking method of entry time classification Exempt from confusion in storehouse.

Further;In described step 3, the lifting of oblique section assembly is to utilize single crane hoisting, two-shipper method in place, starts Utilizing lifting A suspension hook lifting, follow-up auxiliary lifting B suspension hook adjusts angle.

Further;Corner segments assembly lifting in described step 3 uses single crane hoisting i.e. to lift the lifting of A suspension hook.

Further;The lifting of oblique section one in described step 3 is to use single crane hoisting, the combined type lifting side of Alley Oop Oblique section one is first sling by formula by crane B suspension hook, after utilize elevator pulley combination relay in place.

The sectionally assembled installation method of a kind of converter vaporization flue proposed by the invention, utilizes ground easy to assembly soon Victory, reliable in quality, reduces the risk of work high above the ground;Combined type lifting is substantially reduced segmental hoisting and takies the crane time, reduces Large-scale crane machine-team takes and labour cost, improves construction speed, has both met design and code requirement, has reduced again cost, contracting The short duration.

The purposes of the sectionally assembled installation method of above-mentioned a kind of converter vaporization flue that the present invention provides is to construct the factory buildings newly Evaporated flue installation exercise work under environment, the evaporated flue that its interior Alley Oop method lifting can be tried out in technology innovation project hangs Pretend the application of industry;

The present invention has following main beneficial effect compared with traditional installation method:Save the use of large lifting equipment, Raise labour efficiency and lower the danger that labour intensity avoids or reduce work high above the ground to bring, improving and management and control risk is installed.Ground Tissue, convenient and reliable, improve welding quality.In sum, present invention ground in the installation of large-scale evaporated flue assembles and improves Erecting and welding quality;Combined type lifting reduces work high above the ground risk;In whole installation process, safe and efficient, reliable in quality.

Brief description

Accompanying drawing 1 converter evaporation cooling air flue forms layout drawing.

Accompanying drawing 2 converter evaporation cooling air flue oblique section assembly assembles schematic diagram.

Accompanying drawing 3 converter evaporation cooling air flue corner segments assembly assembles schematic diagram.

Accompanying drawing 4 converter evaporation cooling air flue oblique section assembly lifts schematic diagram.

Accompanying drawing 5 converter evaporation cooling air flue corner segments assembly lifts schematic diagram.

The oblique section of accompanying drawing 6 converter evaporation cooling air flue one lifts schematic diagram.

Accompanying drawing 7 converter evaporation cooling air flue mobile flue lifts schematic diagram.

In figure:Skirt cover the 1st, mobile flue the 2nd, oblique section 1, oblique section 24, oblique section 35, corner flue 1, corner flue 27, Mobile flue track the 8th, mobile flue mobile trolley used 9th, support beam platform the 10th, oblique section assembly the 11st, shoulder pole for hoisting the 12nd, crane A Suspension hook the 13rd, steel wire rope the 14th, crane B suspension hook the 15th, platform 1, temporary support mechanism the 17th, corner segments assembly the 18th, elevator assembly pulley Close the 19th, reserved rope the 20th, to lift rope 1, lift rope 2 22.

Detailed description of the invention

Below by specific embodiment, technical scheme is described in further detail, but the present invention is simultaneously It is not limited to embodiment.

A kind of converter vaporization flue piecewise combination installation method of the present invention, it is characterised in that described installation method includes Following steps:

Step one, preparation of construction;

1.1 fabricating yard Horizon seamlesses are real, meet the condition of the place level of gasification cooling flue sectional;

1.2 welding equipments are marched into the arena, and all prepare to put in place to the closing measure material of evaporated flue in welding process;

1.3 carry out qualification of welding procedure to material according to the rules, assign weld job guiding book, and hand over welding procedure The end;

1.4 wldings leave in special storehouse, and storehouse is dried, well-ventilated;

1.5 shoulder pole for hoistings 12 prepare to put in place;

Steel construction in gasification cooling flue hoisting process, according to lifting requirements, wouldn't be installed by 1.6, the girder of structural stability Must install;

1.7 arrange gasification cooling flue according to the requirement of factory building columns alignment on steel structure girder installs center line and absolute altitude;

Step 2, organize right

2.1 are lifted on oblique section 24 and oblique section 35 on the ground of smooth compacting, and level is put, and control oblique section 24 and oblique section The levelness of 35, centrad, parameter centering starts after finishing in ground welding;

2.2 lift corner flue 1 and corner flue 27 to the ground of smooth compacting, and level is put, at corner flue 1 and corner flue 27 groups to during control the levelness of oblique section 24 and oblique section 35 well, center distance, parameter centering is complete Weld after Biing;

Step 3:Lifting

First 3.1 lift oblique section assembly 11, after support beam platform 10 erecting and welding finishes, utilizes crane A suspension hook 13 to hang up properly Steel wire rope, shoulder pole for hoisting 12 lift, and keep the uniform force of steel wire rope;When whole work are whole after setting completed, slow Slowly hoist crane A suspension hook 13, vertically slings, when oblique section assembly 11 exceed steel-making high across technique platform after insertion from bottom to top In support beam platform 10, after oblique section assembly 11 hypomere runs through support beam platform 10, utilize crane B suspension hook 15 slow from downside The slow angle adjusting oblique section assembly 11 so that it is be located in smoothly on support beam platform 10, after angle adjustment finishes, at platform Temporary support mechanism 17 is set on one 16, keeps oblique section assembly 11 fixed angle;

3.2 after the lifting of oblique section assembly 11 completes, and starts to lift corner segments assembly 18, has assembled at corner segments assembly 18 Cheng Hou, starts with crane A suspension hook 13 and slings corner segments assembly 18 and slowly fall on support beam platform 10, stable after pluck Hook;

3.3 lift oblique section 1 subsequently, owing to oblique section 1 is in factory building platform, it is impossible to directly lift, use Relay Method lifting, First by crane B suspension hook 15, oblique section 1 is sling, be arranged on tiltedly with lifting rope 1 and lifting rope 2 22 respectively before slinging On four hangers of the upper and lower both sides of section 1, on the hanger of upside, separately pre-set a reserved rope 20, and up Platform on elevator pulley combination 19 is set;When crane B suspension hook 15 lifts oblique section 1 to the platform limit, place elevator pulley The suspension hook of combination 19, hangs up reserved rope 20, then passes through elevator pulley combination 19 and crane B suspension hook 15 synchronous matching by oblique section one 3 is in place;In place finish after start to weld oblique section 1 and oblique section assembly 11;

The mobile flue 2 of 3.4 converter evaporation cooling air flues is monoblock type, before lifting, first installs mobile flue track 8, peace Welding equipment connects and lifts mobile flue mobile trolley used 9 after finishing again, and centering finishes rear integral hoisting gasification cooling flue mobile flue 2, Levelling capturing, installation terminates.

Making place in described step one needs smooth compacting, it is ensured that major diameter, large-tonnage equipment are deposited and is not easy Deformation.

Shoulder pole for hoisting 12 in described step one uses H profile steel to make, and in shoulder pole for hoisting 12, spacing 500mm arranges long Stiffened panel, gusset thickness 16mm;Total length is 5m.

Longitudinal direction and cross central line that gasification cooling flue is set out according to factory building columns alignment in described step one.

The special storehouse that wlding in described step one is deposited, is provided with thermometer and hygrometer, and environment temperature is not less than 5 DEG C, air humidity is maintained at less than 50%;In wlding avoids storehouse by species, the trade mark, specification, the stacking method of entry time classification Chaotic.

In described step 3, the lifting of oblique section assembly 11 is to utilize single crane hoisting, and two-shipper method in place starts with Lifting A suspension hook lifting, follow-up auxiliary lifting B suspension hook adjusts angle.

Corner segments assembly 18 lifting in described step 3 uses single crane hoisting i.e. to lift the lifting of A suspension hook.

The lifting of oblique section 1 in described step 3 is to use single crane hoisting, the combined type lifting mode of Alley Oop, first uses Oblique section 1 is sling by crane B suspension hook, after utilize elevator pulley combination 19 relay in place.

The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every utilize this Equivalent structure or equivalence flow process that bright description is made convert, or are directly or indirectly used in other related technology necks Territory, all in like manner includes in the scope of patent protection of the present invention.

Claims (8)

1. a converter vaporization flue piecewise combination installation method, it is characterised in that described installation method comprises the steps:
Step one, preparation of construction;
1.1 fabricating yard Horizon seamlesses are real, meet the condition of the place level of gasification cooling flue sectional;
1.2 welding equipments are marched into the arena, and all prepare to put in place to the closing measure material of evaporated flue in welding process;
1.3 carry out qualification of welding procedure to material according to the rules, assign weld job guiding book, and hand over welding procedure The end;
1.4 wldings leave in special storehouse, and storehouse is dried, well-ventilated;
1.5 shoulder pole for hoisting(12)Preparation puts in place;
Steel construction in gasification cooling flue hoisting process, according to lifting requirements, wouldn't be installed by 1.6, the girder of structural stability Must install;
1.7 arrange gasification cooling flue according to the requirement of factory building columns alignment on steel structure girder installs center line and absolute altitude;
Step 2, organize right;
2.1 by oblique section two(4)With oblique section three(5)Being lifted on the ground of smooth compacting, level is put, and controls oblique section two(4) With oblique section three(5)Levelness, centrad, parameter centering start after finishing ground welding;
2.2 by corner flue one(6)With corner flue two(7)Lifting to the ground of smooth compacting, level is put, at corner Flue one(6)With corner flue two(7)Group to during control oblique section two well(4)With oblique section three(5)Levelness, in the heart Away from parameter centering welds after finishing;
Step 3:Lifting;
First 3.1 lift oblique section assembly(11), at support beam platform(10)After erecting and welding finishes, utilize crane A suspension hook (13)Hang up properly steel wire rope, shoulder pole for hoisting(12)Lift, keep the uniform force of steel wire rope;When whole work are all arranged After finishing, slowly hoist crane A suspension hook(13), vertically sling, when oblique section assembly(11)Exceed steel-making high after technique platform Insertion support beam platform from bottom to top(10)In, when oblique section assembly(11)Hypomere runs through support beam platform(10)After, utilize Crane B suspension hook(15)Slowly adjust oblique section assembly from downside(11)Angle so that it is be located in support beam platform smoothly(10) On, after angle adjustment finishes, at platform one(16)On temporary support mechanism is set(17), keep oblique section assembly(11)Fixing Angle;
3.2 at oblique section assembly(11)After lifting completes, start to lift corner segments assembly(18), at corner segments assembly(18) After being completed, start with crane A suspension hook(13)By corner segments assembly(18)Sling and slowly fall into support beam platform(10) On, stable rear decoupling device;
3.3 lift oblique section one subsequently(3), due to oblique section one(3)It is in factory building platform, it is impossible to directly lift, use Relay Method Lifting, first uses crane B suspension hook(15)By oblique section one(3)Sling, respectively with lifting rope one before slinging(21)With lifting rope Two(22)It is arranged on oblique section one(3)Upper and lower both sides four hangers on, separately pre-set on the hanger of upside one reserve Rope(20), and elevator pulley combination is set on platform up(19);When crane B suspension hook(15)Lift oblique section one(3)Arrive During the platform limit, place elevator pulley combination(19)Suspension hook, hang up reserved rope(20), then pass through elevator pulley combination(19) With crane B suspension hook(15)Synchronous matching is by oblique section one(3)In place;In place finish after start to weld oblique section one(3)With the combination of oblique section Body(11);
The mobile flue of 3.4 converter evaporation cooling air flues(2)For monoblock type, before lifting, mobile flue track is first installed (8), it is mobile trolley used that erecting and welding lifts mobile flue after finishing again(9), centering finishes rear integral hoisting gasification cooling flue and moves Dynamic flue(2), levelling capturing, installation terminates.
2. a kind of converter vaporization flue piecewise combination installation method according to claim 1, is characterized in that, described step one In making place need smooth compacting, it is ensured that major diameter, large-tonnage equipment are deposited and are not easy deformation.
3. a kind of converter vaporization flue piecewise combination installation method according to claim 1, is characterized in that, described step one In shoulder pole for hoisting(12)H profile steel is used to make, shoulder pole for hoisting(12)Interior spacing 500mm arranges long stiffened panel, and gusset is thick Degree 16mm;Total length is 5m.
4. a kind of converter vaporization flue piecewise combination installation method according to claim 1, is characterized in that, described step one In longitudinal direction and cross central line that gasification cooling flue is set out according to factory building columns alignment.
5. a kind of converter vaporization flue piecewise combination installation method according to claim 1, is characterized in that, described step one In the special storehouse deposited of wlding, be provided with thermometer and hygrometer, environment temperature is not less than 5 DEG C, and air humidity is maintained at Less than 50%;Wlding is chaotic in avoiding storehouse by species, the trade mark, specification, the stacking method of entry time classification.
6. a kind of converter vaporization flue piecewise combination installation method according to claim 1, is characterized in that, described step 3 In oblique section assembly(11)Lifting be to utilize single crane hoisting, two-shipper method in place, start with lifting A suspension hook lifting, after Continuous auxiliary lifting B suspension hook adjusts angle.
7. a kind of converter vaporization flue piecewise combination installation method according to claim 1, is characterized in that, described step 3 Middle corner segments assembly(18)Lifting uses single crane hoisting i.e. to lift the lifting of A suspension hook.
8. a kind of converter vaporization flue piecewise combination installation method according to claim 1, is characterized in that, described step 3 In oblique section one(3)Lifting be use single crane hoisting, the combined type lifting mode of Alley Oop, first with crane B suspension hook by oblique section One(3)Sling, after utilize elevator pulley combination(19)Relay is in place.
CN201610744276.XA 2016-08-29 2016-08-29 A kind of converter vaporization flue piecewise combination installation method CN106435087B (en)

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CN107763304A (en) * 2017-10-20 2018-03-06 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of replacing options of the vertical FlexbleJoint in high-altitude
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CN107763304A (en) * 2017-10-20 2018-03-06 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of replacing options of the vertical FlexbleJoint in high-altitude
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CN109022672A (en) * 2018-08-24 2018-12-18 中国二十冶集团有限公司 The installation method of converter evaporation cooling air flue when a kind of maintenance
CN110306755A (en) * 2019-07-03 2019-10-08 南通八建集团有限公司 Kitchen chimney flue engineering construction method
CN110373512A (en) * 2019-08-16 2019-10-25 中国十七冶集团有限公司 A kind of converter dry cleaner combined installation method

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