CN102329903A - Construction method for restoring jacked blast furnace shell - Google Patents
Construction method for restoring jacked blast furnace shell Download PDFInfo
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- CN102329903A CN102329903A CN201110267608A CN201110267608A CN102329903A CN 102329903 A CN102329903 A CN 102329903A CN 201110267608 A CN201110267608 A CN 201110267608A CN 201110267608 A CN201110267608 A CN 201110267608A CN 102329903 A CN102329903 A CN 102329903A
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Abstract
The invention relates to a construction method for restoring a jacked blast furnace shell, belonging to construction methods for reforming smelting equipment. The construction method comprises the following specific steps of: (1) making early stage preparations; (2) opening pores the furnace shell; (3) installing jacking plates of numerical control hydraulic jacks; (4) setting the numerical control hydraulic jacks and a complete set of hydraulic control system; (5) jacking and descending the blast furnace shell and cutting a first belt furnace shell; (6) adjusting the center and the elevation of the blast furnace; (7) replacing the first belt furnace shell; (8) welding the replaced first belt furnace shell; and (9) overally restoring equipment, components and a furnace bottom cooling system connected with the blast furnace shell. The first belt furnace shell is divided into 8 equal parts according to the perimeter, 8 corresponding oblong pores are made, the jacking plates of the numerical control hydraulic jacks are welded, the synchronous lifting and descending of the blast furnace shell is controlled through 8 numerical control hydraulic jacks and a centralized hydraulic station, the blast furnace shell is gradually cut by blocks clockwise, and the first belt furnace shell is replaced to realize the overall restoration of the blast furnace shell.
Description
Technical field
The invention belongs to smelting equipment rebuilding construction method, especially relate to a kind of constructional method of iron-smelting blast furnace furnace shell integral reset.
Background technology
Domestic metallurgy industry; After particularly the ironmaking system blast furnace is gone into operation; Because of causing last furnace shell to go up, many factors (as having used refractory materials in the underproof stove) reach 200 ~ 300mm; Cause the upcast FlexbleJoint that is attached thereto to damage, skew bridge material loading, iron perforater, clay gun, air port equipment etc. are all produced bigger influence, even can't ordinary production; In this case; Common treatment process is that blast furnace and the split of furnace roof equipment are removed, and the last furnace shell transformation after satisfy designed elevation, is resetted blast furnace and the installation of furnace roof equipment again; But this method long construction period; Cooling stave will carry out removing of destruction, and difficulty of construction is big, and engineering cost is high.
Summary of the invention
The purpose of this invention is to provide a kind of constructional method that last furnace shell after the rise is resetted, can not only solve effectively because of blast furnace goes up and cause the problem of the quality that ironmaking system can't normally move, and
This constructional method is safe and reliable, saves the duration, guarantees construction quality.
The objective of the invention is to realize like this: a kind of constructional method that last furnace shell after the rise is resetted is through adopting the first band furnace shell to be divided into eight equal portions by girth; Open the slot of eight high 750mm * wide 500mm in the first band furnace shell bottom correspondence of blast furnace, with process by the top
The corresponding welding of each hole wall that plate, each raising plate and the blast furnace first of strengthening gusset weldering system are with on the furnace shell; Raising plate as eight TJJ-2000G type numerical control hydraulic jacking devices; Control the synchronization lifting of realizing last furnace shell through eight TJJ-2000G type numerical control hydraulic jacking devices and concentrated Hydraulic Station; Utilize the first band furnace shell of progressively piecemeal cutting of CW, replacing blast furnace again, the integral reset of the blast furnace after realizing going up.
A kind of constructional method that last furnace shell after the rise is resetted; Its concrete steps are: one, early-stage preparations, two, the furnace shell perforate, three, the raising plate of numerical control hydraulic jacking device is installed; Four, the setting of numerical control hydraulic jacking device, complete hydrauliccontrol system; The cutting of five, the jacking of last furnace shell, decline and the first band furnace shell, six, the adjustment of blast furnace center, absolute altitude, the replacing of seven, the first band furnace shell; The welding of the first band furnace shell of eight, changing, nine, the integral reset of the equipment that links to each other with last furnace shell, member, furnace bottom cooling system
Wherein:
One, early-stage preparations:
A, technology are prepared: according to former construction drawing, the technician calculates the net weight of last furnace shell and auxiliary facility earlier, as the configuration foundation of raising plate and hydraulic lifting device, the workmen is carried out detailed confiding a technological secret, and signature is confirmed;
B, resource are prepared: be equipped with riveter, welding operator, play heavy industry, operative employee and burner; Preparing enough thickness of slab is the raising plate materials of 30mm and 90mm; Be equipped with eight TJJ-2000G type numerical control hydraulic jacking devices and complete hydrauliccontrol system, assort conventional construction equipment and measuring appliance;
The processing of c, the first band furnace shell steel plate to be replaced: cutting and crooked; The steel plate that cuts the first band furnace shell to be replaced as required is with subsequent use, and the steel plate edge must be smooth, and line of cut should meet size; Wherein, First band furnace shell cutting (processing) four of 1/8th girths, first band furnace shell cutting (processing) eight of ten sixth girths, the size deviation at the opposite joint place after the cutting is ± 1 mm; The bending machining of the subsequent use steel plate of each first band furnace shell; Answer radius-of-curvature up to specification, the scene checks that with the arc model that radius is not less than 1500mm the gap between subsequent use steel plate camber line and the model must not be greater than 2mm; Steel plate should carry out the prefabricated pressure head in end before brake forming; Behind pressure head, the steel plate end should meet the requirements of radian, and its deviation must not surpass ± 1 mm;
D, because of body of heater goes up unusually, for preventing that body of heater sinks suddenly in the refractory materials demolishing process in the blast furnace; Guarantee to remove the safety of construction; Behind the blast furnace stopping, coal gas sealing cover and the ramming mass in the sealing cover, the grouting material earlier furnace bottom installed are removed, and between furnace shell support ring and basis, use the parallels jam-pack; Prevent that body of heater from descending suddenly; Guarantee to remove the safety of construction, after furnace shell and basis pad, remove furnace lining, bottom the first layer cooling stave, furnace bottom water-cooled beam pipe, furnace bottom shrouding and heat resisting foundation pier in the blast furnace;
E, the bolt that blast furnace furnace roof equipment is linked to each other with furnace top flange unclamp, and with hydraulic lifting device jack-up, let the weight of blast furnace furnace roof equipment on the blast furnace steelwork framework, to reduce the weight of numerical control hydraulic jacking device jacking furnace shell (body);
F, before the last furnace shell jacking, must carry out repetition measurement to blast furnace center, the absolute altitude of former blast furnace, and carry out record, permanent absolute altitude and the center with blast furnace compares again, overproof part is eliminated when last furnace shell resets.
Two, furnace shell perforate:
Working space and furnace shell falling head according to the numerical control hydraulic jacking device; The blast furnace first band furnace shell is divided equally eight equal portions by girth; Blast furnace concrete foundation face (+1875mm) first band of top is uniformly distributed with on the furnace shell and offers eight slots, the hole is of a size of high 750mm * wide 500mm.
Three, the raising plate of numerical control hydraulic jacking device is installed: (see accompanying drawing 1, shown in 2)
In above-mentioned eight slots 4; The raising plate 1 of numerical control hydraulic jacking device 5 is installed respectively; The material of this raising plate 1 is identical with the mother metal of the blast furnace first band furnace shell 8; The raising plate 1 of this numerical control hydraulic jacking device 5 is mainly formed with top board 6 by strengthening gusset 2; The length of this top board 6 * wide * thick is 200mm * 200mm * 90mm, and this top board 6 welds with the top furnace shell of slot 4 and the outer respectively outside and the inboard of stretching out the first band furnace shell 8 of front and back section of top board 6 mutually, is with the thick reinforcement gusset 2 of 30mm that is that is welded respectively between the inside and outside surface of furnace shell 8 forward and backward overhanging section and first of top board 6; Each welds the thickness that the meat height is not less than minimum thickness of slab, with the raising plate 1 as numerical control hydraulic jacking device 5.
Four, the setting of numerical control hydraulic jacking device, complete hydrauliccontrol system: (see accompanying drawing 1, shown in 2)
In eight slots 4 on the first band furnace shell 8 the numerical control hydraulic jacking device 5 that has pressure transmitter is installed respectively; Each numerical control hydraulic jacking device 5 all is positioned at below and the support at top board 6 middle parts on 7 of blast furnace concrete foundations, and this numerical control hydraulic jacking device 5 can be the TJJ-2000G type; Complete hydrauliccontrol system is installed on the ground grading of furnace oblique bridge side; To firmly be connected with eight numerical control hydraulic jacking devices respectively with one of eight high pressure hose that coordinative composition of equipments comes; The other end respectively with the Hydraulic Station divider on eight hydraulicefficiency oil delivery ports firmly be connected; These eight hydraulicefficiency oil delivery ports are respectively by eight high pressure hand-operated valve controls, and Hydraulic Station divider house steward is again by a high pressure main valve control; Reactive force on each numerical control hydraulic jacking device 5 shows amount of force through pressure transmitter; Be the stress make the first band furnace shell 8 not caused by the jacking moment of flexure, the top lift of each numerical control hydraulic jacking device 5 should act directly on the first band furnace shell 8 under.
The cutting of five, the jacking of last furnace shell, decline and the first band furnace shell:
Hydrauliccontrol system is received; With eight high pressure hand-operated valve opens of the hydraulicefficiency oil equipped at outlet port on the Hydraulic Station divider; The stud switch of the high pressure main valve of controlling the Hydraulic Station divider is opened; Realize that eight numerical control hydraulic lifting devices rise synchronously, when the reactive force of each numerical control hydraulic jacking device shows that by sensing system reactive force reaches at full capacity, lock this hydraulic jacking system; The height that will swell in the blast furnace first band furnace shell bottom is that 200-300mm surplus band excises with gas cutting tool, at this moment eight synchronous declines of high pressure main valve stud switch off-load realization that the numerical control hydraulic jacking device passes through the Hydraulic Station divider.
Six, the adjustment of blast furnace center, absolute altitude:
After last furnace shell utilizes eight numerical control hydraulic jacking devices to drop to design height; Whether the deviate of inspection blast furnace medullary ray and blast furnace absolute altitude is in the scope of code requirement; Blast furnace absolute altitude major control point is air port absolute altitude or lip ring absolute altitude, if furnace roof equipment do not remove, just mainly with the air port absolute altitude as the reference mark; Because the air port absolute altitude is closely related with the blast furnace center, to take into account simultaneously when absolute altitude and center adjustment; Adopt taper liner iron that last furnace shell absolute altitude and center are finely tuned at furnace bottom support ring place, and pad.
Seven, the replacing of the first band furnace shell: (seeing shown in the accompanying drawing 3)
Change first and be with furnace shell 8 before with the circular arc degree of model inspection top last furnace shell 3, record radian deviate is as the reference of the first band furnace shell, 8 replacings; This first band furnace shell 8 is severed furnace shell from 1# by the height of actual requirement (subsequent use replacing plate) by symmetric position, and burst (piece) replacing method is adopted in the replacing of the first band furnace shell 8, i.e. the part of the first two branch of the first band furnace shell 8; Be to adopt ten sixth bursts to change, change ten sixth sheets of (cutting) the first band furnace shell 8 earlier, will change plate elder generation spot welding location; With upper strata furnace shell firm welding, after radiographic test is qualified, change ten adjacent sixth sheets more then; After second ten adjacent sixth sheet furnace shell changed; To change plate elder generation spot welding location, then with upper strata furnace shell firm welding, after radiographic test is qualified; Weld first ten sixth sheet and second ten sixth sheet again and change the upright seam between the plate, CW is progressively changed successively; Back two/the part of the first band furnace shell 8 is to adopt eight/a slice burst to change, and promptly changes eight/a slice of the first band furnace shell 8 earlier, changes adjacent eight/a slice again, and CW progressively changes successively, and its step changes identical with ten sixth sheets; The replacing of the first band furnace shell 8 and support ring is all carried out synchronously; After new furnace shell support ring installs; For guarantee the first band furnace shell 8 when being welded sustained ring be not subjected to displacement; With the working fastening piece support ring and original furnace shell welding are fixed; The furnace shell that to newly change is again installed by design requirements, staggers and be not less than 200 mm in the weld seam of furnace shell support ring and furnace shell cross joint position.Should measure furnace shell counterpart alignment tolerance when the first band furnace shell, 8 bursts are installed, and with jig adjustment counterpart alignment tolerance, guarantee that counterpart is concordant, both poor (counterpart alignment tolerance) is not more than 3 mm; Horizontal position welding on furnace shell seam is welded with upper strata furnace shell and furnace bottom sustained ring seat respectively, and right for guaranteeing follow-up furnace shell group, the weld seam spot welding of the 500mm left and right sides is respectively stayed in both sides up and down, after welding finishes, uses the parallels jam-pack between supporting base and the blast furnace foundation.
The welding of the first band furnace shell of eight, changing:
After first replacing of the first band furnace shell is in place; Carry out horizontal position welding seam tack-weld with the 200-300mm spacing earlier with the upper strata furnace shell; Then with layering full weld again behind the two side weld gouge back chippings; After first band second of furnace shell carries out the horizontal position welding seam welding with same welding method, the upright seam between first of welding and the first band furnace shell again, and the like also remove the numerical control hydraulic jacking device successively; During last a slice of the welding first band furnace shell; This moment, eight numerical control hydraulic jacking devices were all removed, and the horizontal position welding seam of the last a slice of the first band furnace shell is under pressured state, to weld, and its welding method is: with the whole full welds of a side of weld seam; Back chipping is dug in not advanced promoting the circulation of qi; The other side of weld seam is also carried out full weld, carry out the gouge back chipping with length for the 300mm segmentation then, the horizontal position welding of this last a slice plate of full weld processing is stitched piecemeal again; During the upright seam of welding the last item, terminal at T word seam, discharge stress with the gas cutting tool hole that to open a diameter be 10-20mm, at last that the stopple weldering is full.
The integral reset of the equipment that nine, links to each other, member, furnace bottom cooling system: (seeing shown in the accompanying drawing 4) with last furnace shell
After the first band furnace shell is changed and is finished; With the interim supporting removal on the blast furnace furnace roof equipment 11 that links to each other with last furnace shell 3 on the blast furnace steelwork framework 12, material loading skew bridge 9, the downtake 10; The blast furnace furnace roof equipment 11 that will link to each other with last furnace shell 3, material loading skew bridge 9, downtake 10 integral resets irritate real with the grouting material between support ring seat and the blast furnace concrete foundation 7.After carrying out the interior cast of stove heat resisting foundation pier, installation water-cooled beam water cooling tube, furnace bottom shrouding, recovery the first layer cooling stave, the interior refractory materials 13 of block stove, baker again, until satisfying working condition.
A kind of constructional method that last furnace shell after the rise is resetted provided by the present invention can not only solve effectively because of blast furnace goes up and causes the problem of the quality that ironmaking system can't normally move, and this item
Constructional method is safe and reliable, saves the duration, guarantees construction quality.
Combine accompanying drawing and embodiment that a kind of constructional method that last furnace shell after the rise is resetted that the present invention proposes is described further at present.
Description of drawings
Fig. 1 is that the master that the numerical control hydraulic jacking device is installed looks synoptic diagram.
Fig. 2 is that synoptic diagram is looked on the left side that the numerical control hydraulic jacking device is installed.
Fig. 3 be last furnace shell more change owner look synoptic diagram.
Fig. 4 installs the master who resets to look synoptic diagram after last furnace shell is changed.
Among Fig. 1, Fig. 2, Fig. 3: 1, raising plate 2, reinforcement gusset 3, last furnace shell 4, slot 5, numerical control hydraulic jacking device 6, top board 7, blast furnace concrete foundation 8, the first band furnace shell;
Among Fig. 4: 3, refractory materials in last furnace shell 7, blast furnace concrete foundation 9, material loading skew bridge 10, downtake 11, blast furnace furnace roof equipment 12, blast furnace steelwork framework 13, the stove.
Embodiment
(embodiment)
The Jiangxi 4# of group of Nangang blast furnace the situation that last furnace shell goes up occurred after going into operation on January 13rd, 2004, we utilize this constructional method that last furnace shell after the rise is resetted to repair transformation
One, early-stage preparations:
A, technology are prepared: according to former construction drawing, the technician calculates the net weight of last furnace shell and auxiliary facility earlier, as the configuration foundation of raising plate and hydraulic lifting device, the workmen is carried out detailed confiding a technological secret, and signature is confirmed;
B, resource prepare: be equipped with two of four of riveter, two of welding operator's eight, heavy industrys, two of operative employees and burners; Preparing enough thickness of slab is the raising plate materials of 30mm and 90mm; Be equipped with eight TJJ-2000G type numerical control hydraulic jacking devices and complete hydrauliccontrol system, assort conventional construction equipment and measuring appliance;
The processing of c, the first band furnace shell steel plate to be replaced: cutting and crooked; Cutting needs the steel plate of the first band furnace shell of replacing, and the steel plate edge must be smooth, and line of cut should meet size; Wherein, First band furnace shell cutting (processing) four of 1/8th girths, first band furnace shell cutting (processing) eight of ten sixth girths, the size deviation at the opposite joint place after the cutting is ± 1 mm; The bending machining of each first band furnace shell steel plate; Answer radius-of-curvature up to specification, the on-the-spot arc model inspection of using radius as 1500mm, the gap between steel plate camber line and the model is 2mm; Steel plate should carry out the prefabricated pressure head in end before brake forming; Behind pressure head, the steel plate end should meet the requirements of radian, outside its deviation ± and 1 mm;
D, because of body of heater goes up unusually, for preventing that body of heater sinks suddenly in the anti-material demolishing process in the blast furnace; Guarantee to remove the safety of construction, behind the blast furnace stopping, coal gas sealing cover and the ramming mass in the sealing cover, the grouting material earlier furnace bottom installed are removed; Between furnace shell support ring and basis, use the parallels jam-pack, prevent that body of heater from descending suddenly, guarantee to remove the safety of construction; After furnace shell and basis pad, remove furnace lining, bottom the first layer cooling stave, furnace bottom water-cooled beam pipe, furnace bottom shrouding and heat resisting foundation pier in the blast furnace;
E, the bolt that blast furnace furnace roof equipment is linked to each other with furnace top flange unclamp, and with hydraulic lifting device jack-up, let the weight of blast furnace furnace roof equipment on the blast furnace steelwork framework, to reduce the weight of numerical control hydraulic jacking device jacking furnace shell (body);
F, before the last furnace shell jacking, must carry out repetition measurement to blast furnace center, the absolute altitude of former blast furnace, and carry out record, permanent absolute altitude and the center with blast furnace compares again, overproof part is eliminated when last furnace shell resets.
Two, furnace shell perforate:
Working space and furnace shell falling head according to the numerical control hydraulic jacking device; The first band furnace shell is divided equally eight equal portions by girth; Blast furnace concrete foundation face (+1875mm) first band of top is uniformly distributed with on the furnace shell and offers eight slots, the hole is of a size of high 750mm * wide 500mm.
Three, the raising plate of numerical control hydraulic jacking device is installed:
In above-mentioned eight slots 4; The raising plate 1 of numerical control hydraulic jacking device 5 is installed respectively; The material of this raising plate 1 is identical with the blast furnace first band furnace shell 8 mother metals; The raising plate 1 of this numerical control hydraulic jacking device 5 is mainly formed with top board 6 by strengthening gusset 2; The length of this top board 6 * wide * thick is 200mm * 200mm * 90mm, and this top board 1 welds with the top of slot 4 and the outer respectively outside and the inboard of stretching out the first band furnace shell 8 of front and back section of top board 6 mutually, is with the thick reinforcement gusset 2 of 30mm that is that is welded respectively between the inside and outside surface of furnace shell 8 forward and backward overhanging section and first of top board 6; Each welds the thickness that the meat height is not less than minimum thickness of slab, with the raising plate 1 as numerical control hydraulic jacking device 5.
Four, the setting of numerical control hydraulic jacking device, complete hydrauliccontrol system:
The numerical control hydraulic jacking device that has pressure transmitter is installed respectively in eight slots of the first band furnace shell; Each numerical control hydraulic jacking device all is positioned at below and the support at top board middle part on blast furnace concrete foundation face, and this numerical control hydraulic jacking device is the TJJ-2000G type; Complete hydrauliccontrol system is installed on the ground grading of furnace oblique bridge side; To firmly be connected with eight numerical control hydraulic jacking devices respectively with one of eight high pressure hose that coordinative composition of equipments comes; The other end respectively with the Hydraulic Station divider on eight delivery ports firmly be connected; Eight hydraulicefficiency oil outlets are respectively by eight high pressure hand-operated valve controls, and Hydraulic Station divider house steward is again by a high pressure main valve control.Reactive force shows amount of force through pressure transmitter on the numerical control hydraulic jacking device; Be the stress that makes the first band furnace shell not caused by the jacking moment of flexure, the top lift of each numerical control hydraulic jacking device should act directly under the first band furnace shell.
The cutting of five, the jacking of last furnace shell, decline and the first band furnace shell:
The Hydraulic Station system is received; With eight the high pressure hand-operated valve opens in Hydraulic Station export distributor place; The stud switch of the high pressure main valve of controlling the Hydraulic Station divider is opened; Realize that eight numerical control hydraulic lifting devices rise synchronously, when the reactive force of each numerical control hydraulic jacking device shows that by sensing system reactive force reaches at full capacity, lock this hydraulic jacking system; Is that the surplus band of 200-300mm excises with gas cutting tool in blast furnace first band furnace shell bottom with height, and at this moment eight numerical control hydraulic jacking devices are realized descending synchronously through the high pressure main valve stud switch off-load of Hydraulic Station divider.
Six, the adjustment of blast furnace center, absolute altitude:
After last furnace shell utilizes eight numerical control hydraulic jacking devices to drop to design height; Whether the deviate of inspection blast furnace medullary ray and blast furnace absolute altitude is in the scope of code requirement; Blast furnace absolute altitude major control point is air port absolute altitude or lip ring absolute altitude, if furnace roof equipment do not remove, just mainly with the air port absolute altitude as the reference mark; Because the air port absolute altitude is closely related with the blast furnace center, to take into account simultaneously when absolute altitude and center adjustment; Adopt taper liner iron that last furnace shell absolute altitude and center are finely tuned at furnace bottom support ring place, and pad.
Seven, the replacing of the first band furnace shell:
Change first and be with furnace shell before with the circular arc degree of model inspection top furnace shell, record radian deviate is as the reference of the first band furnace shell replacing.This first band furnace shell is severed furnace shell from 1# by the height (2m) of standby plate by symmetric position, and the replacing of the first band furnace shell adopts burst to change method, i.e. the part of the first two branch of the first band furnace shell; Be to adopt ten sixth bursts to change, change ten sixth sheets of the first band furnace shell earlier, first spot welding location; With upper strata furnace shell firm welding, after radiographic test is qualified, change adjacent ten sixth sheets more then; After second adjacent ten sixth furnace shell changed, first spot welding location was then with upper strata furnace shell firm welding; After radiographic test is qualified, weld the upright seam of first ten sixth and second ten sixth again; Back two/the part of the first band furnace shell is to adopt 1/8th bursts to change, and changes 1/8th of the first band furnace shell earlier, changes adjacent 1/8th again.The replacing of the first band furnace shell and support ring is all carried out synchronously; After new furnace shell support ring installs; For guarantee the first band furnace shell when being welded sustained ring be not subjected to displacement; With the working fastening piece support ring and original furnace shell welding are fixed; The furnace shell that to newly change is again installed by design requirements, and staggering in the weld seam of furnace shell support ring and furnace shell cross joint position is 200 mm; Measure furnace shell counterpart alignment tolerance when the first band furnace shell is changed, and with jig adjustment counterpart alignment tolerance, guarantee that counterpart is concordant, both poor (counterpart alignment tolerance) is 3 mm; Horizontal position welding on furnace shell seam is welded with upper strata furnace shell and furnace bottom sustained ring seat respectively, and right for guaranteeing follow-up furnace shell group, the weld seam spot welding of the 500mm left and right sides is respectively stayed in both sides up and down, after welding finishes, uses the parallels jam-pack between supporting base and the blast furnace foundation.
The welding of the first band furnace shell of eight, changing:
After the replacing of first first band furnace shell is in place; Carry out horizontal position welding seam tack-weld with the 300mm spacing earlier with the upper strata furnace shell; Layering full weld again behind two side weld gouge back chippings; Second first band be after furnace shell welds with same welding process, the upright seam between welding and the first first band furnace shell again, and the like also remove the numerical control hydraulic jacking device successively; When welding last piece first band furnace shell; This moment, eight numerical control hydraulic jacking devices were all removed, and the horizontal position welding seam of last piece first band furnace shell is under pressured state, to weld, and its welding process is: with the whole full welds of a side of weld seam; Back chipping is dug in not advanced promoting the circulation of qi; The other side of weld seam is also carried out full weld, carry out the gouge back chipping with length for the 300mm segmentation, the horizontal position welding of this last piece plate of full weld processing is stitched piecemeal again.During the upright seam of welding the last item, terminal at T word seam, discharge stress with the gas cutting tool hole that to open a diameter be 10-20mm, at last that the stopple weldering is full.
The integral reset of the equipment that nine, links to each other, member, furnace bottom cooling system with last furnace shell:
After the first band furnace shell is changed and is finished, the furnace roof equipment that will link to each other, the interim supporting removal on the member with last furnace shell, furnace roof equipment, member integral reset that last furnace shell links to each other irritate real with the grouting material between support ring seat and the blast furnace concrete foundation.After carrying out cast heat resisting foundation pier in the stove, installation water-cooled beam water cooling tube, furnace bottom shrouding, recovery the first layer cooling stave, block stove, baker again, satisfy working condition.
Accomplished to 14 Tian Bao quality guarantee amounts transformation task in advance; Whenever 1 day in advance, the owner can earn a profit 600,000 yuan, and the cooling stave protectiveness is removed and reduced expenses about 300,000 yuan; Therefore we have created very big economic benefit for the owner; Obtained praising highly of Jiangxi group of Nangang, also practiced thrift 140,000 yuan of labour costs simultaneously, also opened up more vast market in group of Nangang for this enterprise.
Claims (1)
1. the constructional method that the last furnace shell after the rise is resetted is through adopting the first band furnace shell to be divided into eight equal portions by girth; Open the slot of eight high 750mm * wide 500mm in the first band furnace shell bottom correspondence of blast furnace; Weld each raising plate of system and the corresponding welding of each hole wall on the blast furnace first band furnace shell with what process by top board, reinforcement gusset; Raising plate as eight TJJ-2000G type numerical control hydraulic jacking devices; Control the synchronization lifting of realizing last furnace shell through eight TJJ-2000G type numerical control hydraulic jacking devices and concentrated Hydraulic Station; Utilize the first band furnace shell of progressively piecemeal cutting of CW, replacing blast furnace again, the integral reset of the blast furnace after realizing going up;
A kind of constructional method that last furnace shell after the rise is resetted; Its concrete steps are: one, early-stage preparations, two, the furnace shell perforate, three, the raising plate of numerical control hydraulic jacking device is installed; Four, the setting of numerical control hydraulic jacking device, complete hydrauliccontrol system; The cutting of five, the jacking of last furnace shell, decline and the first band furnace shell, six, the adjustment of blast furnace center, absolute altitude, the replacing of seven, the first band furnace shell; The welding of the first band furnace shell of eight, changing, nine, the integral reset of the equipment that links to each other with last furnace shell, member, furnace bottom cooling system;
Wherein:
One, early-stage preparations:
A, technology are prepared: according to former construction drawing, the technician calculates the net weight of last furnace shell and auxiliary facility earlier, as the configuration foundation of raising plate and hydraulic lifting device, the workmen is carried out detailed confiding a technological secret, and signature is confirmed;
B, resource are prepared: be equipped with riveter, welding operator, play heavy industry, operative employee and burner; Preparing enough thickness of slab is the raising plate materials of 30mm and 90mm; Be equipped with eight TJJ-2000G type numerical control hydraulic jacking devices and complete hydrauliccontrol system, assort conventional construction equipment and measuring appliance;
The processing of c, the first band furnace shell steel plate to be replaced: cutting and crooked; The steel plate that cuts the first band furnace shell to be replaced as required is with subsequent use, and the steel plate edge must be smooth, and line of cut should meet size; Wherein, Four of the first band furnace shell cuttings of 1/8th girths, eight of the first band furnace shell cuttings of ten sixth girths, the size deviation at the opposite joint place after the cutting is ± 1 mm; The bending machining of the subsequent use steel plate of each first band furnace shell; Answer radius-of-curvature up to specification, the scene checks that with the arc model that radius is not less than 1500mm the gap between steel plate camber line and the model must not be greater than 2mm; Steel plate should carry out the prefabricated pressure head in end before brake forming; Behind pressure head, the steel plate end should meet the requirements of radian, and its deviation must not surpass ± 1 mm;
D, because of body of heater goes up unusually, for preventing that body of heater sinks suddenly in the refractory materials demolishing process in the blast furnace; Guarantee to remove the safety of construction; Behind the blast furnace stopping, coal gas sealing cover and the ramming mass in the sealing cover, the grouting material earlier furnace bottom installed are removed, and between furnace shell support ring and basis, use the parallels jam-pack; Prevent that body of heater from descending suddenly; Guarantee to remove the safety of construction, after furnace shell and basis pad, remove furnace lining, bottom the first layer cooling stave, furnace bottom water-cooled beam pipe, furnace bottom shrouding and heat resisting foundation pier in the blast furnace;
E, the bolt that blast furnace furnace roof equipment is linked to each other with furnace top flange unclamp, and with hydraulic lifting device jack-up, let the weight of blast furnace furnace roof equipment on the blast furnace steelwork framework, to reduce the weight of numerical control hydraulic jacking device jacking furnace shell (body);
F, before the last furnace shell jacking, must carry out repetition measurement to blast furnace center, the absolute altitude of former blast furnace, and carry out record, permanent absolute altitude and the center with blast furnace compares again, overproof part is eliminated when last furnace shell resets;
Two, furnace shell perforate:
Working space and furnace shell falling head based on the numerical control hydraulic jacking device; The blast furnace first band furnace shell is divided equally eight equal portions by girth; Blast furnace concrete foundation face (+1875mm) first band of top is uniformly distributed with on the furnace shell and offers eight slots, the hole is of a size of high 750mm * wide 500mm;
Three, the raising plate of numerical control hydraulic jacking device is installed:
In above-mentioned eight slots (4); The raising plate (1) of numerical control hydraulic jacking device (5) is installed respectively; The material of this raising plate (1) is identical with the mother metal of the blast furnace first band furnace shell (8); The raising plate (1) of this numerical control hydraulic jacking device (5) is mainly formed by strengthening gusset (2) and top board (6); The length of this top board (6) * wide * thick is 200mm * 200mm * 90mm, and this top board (6) welds with the top furnace shell of slot (4) and the outer respectively outside and the inboard of stretching out the first band furnace shell (8) of front and back section of top board (6) mutually, is with the thick reinforcement gusset (2) of 30mm that is that is welded respectively between the inside and outside surface of furnace shell (8) forward and backward overhanging section and first of top board (6); Each welds the thickness that the meat height is not less than minimum thickness of slab, with the raising plate (1) as numerical control hydraulic jacking device (5);
Four, the setting of numerical control hydraulic jacking device, complete hydrauliccontrol system:
The numerical control hydraulic jacking device (5) that has pressure transmitter is installed respectively in eight slots (4) on the first band furnace shell (8); Each numerical control hydraulic jacking device (5) all is positioned at below and the support at top board (6) middle part on blast furnace concrete foundation (7) face, and this numerical control hydraulic jacking device (5) is the TJJ-2000G type; Complete hydrauliccontrol system is installed on the ground grading of furnace oblique bridge side; To firmly be connected with eight numerical control hydraulic jacking devices respectively with one of eight high pressure hose that coordinative composition of equipments comes; The other end respectively with the Hydraulic Station divider on eight hydraulicefficiency oil delivery ports firmly be connected; These eight hydraulicefficiency oil delivery ports are respectively by eight high pressure hand-operated valve controls, and Hydraulic Station divider house steward is again by a high pressure main valve control; Reactive force on each numerical control hydraulic jacking device (5) shows amount of force through pressure transmitter; Be the stress make the first band furnace shell (8) not caused by the jacking moment of flexure, the top lift of each numerical control hydraulic jacking device (5) should act directly on the first band furnace shell (8) under;
The cutting of five, the jacking of last furnace shell, decline and the first band furnace shell:
Hydrauliccontrol system is received; With eight high pressure hand-operated valve opens of the hydraulicefficiency oil equipped at outlet port on the Hydraulic Station divider; The stud switch of the high pressure main valve of controlling the Hydraulic Station divider is opened; Realize that eight numerical control hydraulic lifting devices rise synchronously, when the reactive force of each numerical control hydraulic jacking device shows that by sensing system reactive force reaches at full capacity, lock this hydraulic jacking system; The height that will swell in the blast furnace first band furnace shell bottom is that 200-300mm surplus band excises with gas cutting tool, at this moment eight synchronous declines of high pressure main valve stud switch off-load realization that the numerical control hydraulic jacking device passes through the Hydraulic Station divider;
Six, the adjustment of blast furnace center, absolute altitude:
After last furnace shell utilizes eight numerical control hydraulic jacking devices to drop to design height; Whether the deviate of inspection blast furnace medullary ray and blast furnace absolute altitude is in the scope of code requirement; Blast furnace absolute altitude major control point is air port absolute altitude or lip ring absolute altitude, if furnace roof equipment do not remove, just mainly with the air port absolute altitude as the reference mark; Because the air port absolute altitude is closely related with the blast furnace center, to take into account simultaneously when absolute altitude and center adjustment; Adopt taper liner iron that last furnace shell absolute altitude and center are finely tuned at furnace bottom support ring place, and pad;
Seven, the replacing of the first band furnace shell:
With the circular arc degree of model inspection top last furnace shell (3), record radian deviate is as the reference of first band furnace shell (8) replacing before for the replacing first band furnace shell (8); This first band furnace shell (8) is severed furnace shell from 1# by the height of subsequent use replacing plate by symmetric position, and the replacing of the first band furnace shell (8) adopts burst to change method, i.e. the part of the first two branch of the first band furnace shell (8); Be to adopt ten sixth bursts to change, change ten sixth sheets of the first band furnace shell (8) earlier, will change plate elder generation spot welding location; With upper strata furnace shell firm welding, after radiographic test is qualified, change ten adjacent sixth sheets more then; After second adjacent ten sixth sheet furnace shell changed; To change plate elder generation spot welding location, then with upper strata furnace shell firm welding, after radiographic test is qualified; Weld first ten sixth sheet and second ten sixth sheet again and change the upright seam between the plate, CW is progressively changed successively; Back two/the part of the first band furnace shell (8); Be to adopt eight/a slice burst to change, promptly change eight/a slice of the first band furnace shell (8) earlier, change adjacent eight/a slice again; CW progressively changes successively, and its step changes identical with ten sixth sheets; The replacing of the first band furnace shell (8) and support ring is all carried out synchronously; After new furnace shell support ring installs; For guarantee first the band furnace shell (8) when being welded sustained ring be not subjected to displacement; With the working fastening piece support ring and original furnace shell welding are fixed; The furnace shell that to newly change is again installed by design requirements, staggers and be not less than 200 mm in the weld seam of furnace shell support ring and furnace shell cross joint position; Should measure furnace shell counterpart alignment tolerance when first band furnace shell (8) burst is installed, and with jig adjustment counterpart alignment tolerance, guarantee that counterpart is concordant, both differences are that the counterpart alignment tolerance is not more than 3 mm; Horizontal position welding on furnace shell seam is welded with upper strata furnace shell and furnace bottom sustained ring seat respectively, and right for guaranteeing follow-up furnace shell group, the weld seam spot welding of the 500mm left and right sides is respectively stayed in both sides up and down, after welding finishes, uses the parallels jam-pack between supporting base and the blast furnace foundation;
The welding of the first band furnace shell of eight, changing:
After first replacing of the first band furnace shell is in place; Carry out horizontal position welding seam tack-weld with the 200-300mm spacing earlier with the upper strata furnace shell; Then with layering full weld again behind the two side weld gouge back chippings; After first band second of furnace shell carries out the horizontal position welding seam welding with same welding method, the upright seam between first of welding and the first band furnace shell again, and the like also remove the numerical control hydraulic jacking device successively; During last a slice of the welding first band furnace shell; This moment, eight numerical control hydraulic jacking devices were all removed, and the horizontal position welding seam of the last a slice of the first band furnace shell is under pressured state, to weld, and its welding method is: with the whole full welds of a side of weld seam; Back chipping is dug in not advanced promoting the circulation of qi; The other side of weld seam is also carried out full weld, carry out the gouge back chipping with length for the 300mm segmentation then, the horizontal position welding of this last a slice plate of full weld processing is stitched piecemeal again; During the upright seam of welding the last item, terminal at T word seam, discharge stress with the gas cutting tool hole that to open a diameter be 10-20mm, at last that the stopple weldering is full;
The integral reset of the equipment that nine, links to each other, member, furnace bottom cooling system with last furnace shell:
After the first band furnace shell is changed and is finished; With the interim supporting removal on the blast furnace furnace roof equipment (11) that links to each other with last furnace shell (3) on the blast furnace steelwork framework (12), material loading skew bridge (9), the downtake (10); The blast furnace furnace roof equipment (11) that will link to each other with last furnace shell (3), material loading skew bridge (9), downtake (10) integral reset irritate real with the grouting material between support ring seat and the blast furnace concrete foundation (7); Carry out cast heat resisting foundation pier in the stove, installation water-cooled beam water cooling tube, furnace bottom shrouding again, recover the first layer cooling stave, build refractory materials (13), baker in the stove, until satisfying working condition.
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| CN104060102A (en) * | 2014-07-08 | 2014-09-24 | 七冶建设有限责任公司 | Method for mounting large-sized flash smelting furnace |
| CN107964573A (en) * | 2017-12-31 | 2018-04-27 | 安徽马钢工程技术集团有限公司 | A kind of medium blast furnace furnace shell Replacement procedure |
| CN110203825A (en) * | 2019-06-21 | 2019-09-06 | 五冶集团上海有限公司 | Furnace oblique bridge method for dismounting |
| CN113247815A (en) * | 2021-06-10 | 2021-08-13 | 四川君和环保股份有限公司 | Hydraulic jacking and inverting method |
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| CN101818222A (en) * | 2010-04-28 | 2010-09-01 | 北京首钢建设集团有限公司 | Construction method for replacing blast furnace shell shroud by 'furnace body suspension method' |
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| CN104060102A (en) * | 2014-07-08 | 2014-09-24 | 七冶建设有限责任公司 | Method for mounting large-sized flash smelting furnace |
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| CN107964573A (en) * | 2017-12-31 | 2018-04-27 | 安徽马钢工程技术集团有限公司 | A kind of medium blast furnace furnace shell Replacement procedure |
| CN107964573B (en) * | 2017-12-31 | 2019-07-30 | 安徽马钢工程技术集团有限公司 | A kind of medium blast furnace furnace shell Replacement procedure |
| CN110203825A (en) * | 2019-06-21 | 2019-09-06 | 五冶集团上海有限公司 | Furnace oblique bridge method for dismounting |
| CN110203825B (en) * | 2019-06-21 | 2022-07-12 | 五冶集团上海有限公司 | Blast furnace inclined bridge dismantling method |
| CN113247815A (en) * | 2021-06-10 | 2021-08-13 | 四川君和环保股份有限公司 | Hydraulic jacking and inverting method |
| CN113247815B (en) * | 2021-06-10 | 2021-10-01 | 四川君和环保股份有限公司 | Hydraulic jacking and inverting method |
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