CN109266869B - Furnace cover upside-down mounting and furnace cover mounting process - Google Patents
Furnace cover upside-down mounting and furnace cover mounting process Download PDFInfo
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- CN109266869B CN109266869B CN201811263446.8A CN201811263446A CN109266869B CN 109266869 B CN109266869 B CN 109266869B CN 201811263446 A CN201811263446 A CN 201811263446A CN 109266869 B CN109266869 B CN 109266869B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/02—Obtaining nickel or cobalt by dry processes
- C22B23/023—Obtaining nickel or cobalt by dry processes with formation of ferro-nickel or ferro-cobalt
Abstract
The technology relates to the field of industrial capital construction and large part installation, and provides a furnace cover inverted installation and furnace cover installation process, which overcomes the influence on furnace cover lifting and installation operation after a factory building roof and a rain-proof system are formed, and safely, simply and conveniently lifts and installs the furnace cover; a furnace cover upside-down mounting and furnace cover mounting process comprises an electric furnace workshop formed by a steel structure, a roof and a defense system, and a furnace shell which is already mounted and in place, wherein the furnace shell comprises a peripheral section furnace cover, a middle-width section furnace cover and a split furnace cover of a central section furnace cover; the device comprises a flat car for transporting the split furnace cover to a field storage yard, a mobile hoisting device for hoisting and installing the split furnace cover, a main hoisting system with a main hoist matched with a main hoisting pulley block, an auxiliary hoisting system with an auxiliary hoist matched with an auxiliary hoisting pulley block, a chain block for correcting the moving direction of the split furnace cover in the process of hoisting and installing the split furnace cover, and the device also comprises a furnace cover inversion technology and a furnace cover installation technology by utilizing the mobile hoisting device and the hoist matched with the pulley block.
Description
Technical Field
The technology relates to the field of industrial capital construction and large part installation, and provides a furnace cover inverted installation and furnace cover installation process, which overcomes the influence on furnace cover lifting and installation operation after a factory building roof and a rainproof system are formed, and safely, simply and conveniently lifts and installs the furnace cover.
Background
The ferronickel electric furnace (also used as an electric furnace in the present case) is a thermal reaction site mainly used for reducing metallic nickel, separating slag and ferronickel and producing ferronickel.
In the prior art, a commonly used electric furnace body mainly comprises a base arranged on the basis of an electric furnace workshop with a steel structure, a furnace shell arranged on the base, a furnace cover covering the upper opening of the furnace shell and a furnace cover hanging system arranged on the furnace cover.
The base (furnace bottom plate) comprises a furnace bottom air-cooled I-shaped steel fixedly connected on the basis of the electric furnace workshop and a bottom plate laid on the furnace bottom air-cooled I-shaped steel furnace.
The furnace shell of the vertical cylindrical structure is formed by connecting a plurality of single furnace shell segments (split furnace shells) through spring steel plates. Every two adjacent split furnace shells are lapped and fixedly connected by a plurality of spring steel plates, and the top and the bottom of every two adjacent split furnace shells are connected by high-strength bolts, so that the furnace shells are expanded in a spherical surface manner in the production process, and the inner cavity of the furnace shells is a hearth.
The furnace cover is a device for sealing the hearth, reducing heat loss and improving the working condition of a smelting interval, and comprises two parts, namely a furnace cover and a furnace cover hanging system. The furnace cover is of a disc structure on the whole and is formed by fixedly connecting a plurality of disc peripheral section furnace covers, a plurality of disc middle section furnace covers and a plurality of disc central section furnace covers which are uniformly distributed along the circumferential direction through high-strength bolts (for simplicity, the peripheral section furnace covers, the middle section furnace covers and the central section furnace covers are collectively called as split furnace covers). Two adjacent split furnace covers are connected by bolts, and sleeves and gaskets made of insulating materials are adopted between the split furnace covers and between the bolts and the split furnace covers for insulation. The furnace cover hanging system is formed by uniformly distributing a plurality of stainless steel pipes on a furnace cover and hanging the stainless steel pipes on steel beams of a workshop of an electric furnace. Wherein the furnace cover and the hanging space, and the hanging space and the steel beam of the factory building are insulated by backing plates made of insulating materials. Insulation is also arranged between the furnace cover and the furnace shell.
The electric furnace adopts alternating current for smelting, and because the ferronickel electric furnace converts low-voltage and large-current electric energy into heat energy, current passes through the main equipment; in order to ensure stable and safe production of the ferronickel electric furnace, when the electric furnace workshop and the compact space near the electric furnace workshop are reasonably utilized to ensure that the best connection ground is arranged among all the professionals for installing the ferronickel electric furnace body, the insulation of the base, the furnace shell, the furnace cover and the hanging system must meet the insulation requirement of the ferronickel electric furnace, and the insulation installation mode and the quality are important links which cannot be ignored.
The installation of the electric furnace body commonly used in China is sequential installation, namely base installation, base insulation installation, assembly and installation of a ten-piece furnace shell, furnace cover and insulation installation, hanging system and insulation installation, and steel structure and equipment installation on the upper part of a furnace body.
The furnace shell is assembled and installed on the upper portion of the insulating plate after the furnace bottom insulating installation is completed, and the furnace shell is made of ceramic fibers, so that the furnace shell is poor in strength and extremely prone to damage due to external force, the furnace shell needs to be accurately placed in place at one time, large installation difficulty is brought to a single large furnace shell, and extra loss and manual waste of a large crane machine are caused in the process. Secondly, if the construction is carried out in rainy seasons or rainy zones, the construction is completed before the rain-proof system of the factory building roof is not formed at the bottom of the furnace, large-area insulation rain-proof water is a great challenge in the stage before the rain-proof system of the factory building roof is formed, and if insulation is soaked carelessly, the insulation requirement cannot be met, and rework is needed.
Like furnace bottom insulation, furnace covers and insulation construction also face the problems, the furnace covers are hoisted by large cranes to occupy the whole space above the furnace covers, the processes above other furnace covers cannot be normally carried out, the limited ground space is occupied by the large crane for hoisting the furnace covers, and the ground space reserved for other processes is quite tight.
In the existing construction process, the allocation, transportation and installation of the electric furnace body are carried out before the installation of a roof steel structure and a rainproof system of a factory building.
The construction time of ferronickel electric furnaces and workshops is shortened as much as possible, so that the electric furnaces are completed and put into production as soon as possible, and the ferronickel electric furnaces are also urgent requirements of owner units.
Disclosure of Invention
The technology aims to provide a furnace cover inverted installation and furnace cover installation process, overcomes the influence on furnace cover lifting and installation operation after a factory building roof and a rainproof system are formed, and safely, simply and conveniently lifts and installs the furnace cover.
The technical purpose is realized by the following technical scheme:
a furnace cover upside-down mounting and furnace cover mounting process comprises an electric furnace workshop formed by a steel structure, a roof and a defense system, and a furnace shell which is already mounted and in place, wherein the furnace shell comprises a peripheral section furnace cover, a middle-width section furnace cover and a split furnace cover of a central section furnace cover; the flat car for transporting the split furnace cover to a field storage yard is used for lifting and installing a mobile lifting device of the split furnace cover, a main lifting system consisting of a main winch and a main lifting pulley block, an auxiliary lifting system consisting of an auxiliary winch and an auxiliary lifting pulley block, a chain block for correcting the moving direction of the split furnace cover in the lifting and installing process of the split furnace cover, and the steps of inversely installing the furnace cover and installing the furnace cover by utilizing the mobile lifting device and the winch to cooperate with the pulley block are also included:
A. furnace cover positioning line
Setting radius positioning lines and angle positioning lines of a six-segment peripheral furnace cover at a position where a furnace cover is installed on the top of a furnace shell by using a total station;
B. furnace cover transporting
Transporting the split furnace covers to a field storage yard by using a flat car, wherein the transporting sequence is that transporting the peripheral furnace covers firstly, transporting the middle furnace covers secondly and transporting the central furnace covers secondly;
C. hoisting and mounting of peripheral furnace cover
(a) The movable hoisting equipment hoists the split furnace cover to a height mark at the top of the furnace shell of the electric furnace workshop, wherein the height mark is an operation height mark; slowly swinging the arm to be close to the electric furnace body to the maximum extent, and placing 2m to one end of the split furnace cover on the elevation platform, wherein the position is a temporary detention position; a main hoisting pulley block hook split furnace cover which is hung on the opposite side of the temporary detention position and is higher than the operation elevation is positioned at one end in the furnace, and slowly moves into the furnace under the action of a main hoisting machine;
(b) when the gravity center of the split furnace cover slides into the plant, one end of each of the main winch and the movable hoisting equipment is hoisted, and the split furnace cover continues to slide into the furnace;
(c) when the outer end of the split furnace cover hoisted by the movable hoisting equipment slides to the edge of the factory building, the hook can be loosened, and the split furnace cover is hoisted independently by the main hoist and continues to slide into the furnace;
(d) after the main winch drags the sectioning furnace cover to slide into the furnace, an auxiliary winch with a lifting point right above the center of the sectioning furnace cover is matched with an auxiliary winch pulley block to descend from the height of the electric furnace workshop higher than the operation elevation to the operation elevation, is hung on the sectioning furnace cover and is matched with the main winch to enable the sectioning furnace cover to continuously move into the furnace;
(e) the auxiliary winch is mainly hung, and the main winch gives an inward sliding constraint force to the split furnace cover so that the split furnace cover stably and slowly moves towards the inside of the furnace until the gravity center of the split furnace cover and the hook head of the auxiliary winch are on the same vertical line, so that the constraint force of the main winch can be cancelled;
D. the furnace cover at the peripheral section is installed from the north to the two sides, and finally, the south-most side flap is embedded
(a) Adjusting the lifting point of the auxiliary hoisting pulley block to a position right above the installed sectioning furnace cover, hooking the sectioning furnace cover, lifting and applying pretension, and positioning the sectioning furnace cover in place by using chain block matching in the period;
(b) after the split furnace cover is placed on a positioning line at the top of the furnace shell, a level gauge is erected at the position where the elevation is lower than the operation elevation for adjusting the elevation of the furnace cover, after the position line and the elevation of the furnace cover are adjusted, temporary hanging of the furnace cover is started, and the temporary hanging is hung on a steel structure with the operation elevation by using channel steel;
(c) after temporary hanging installation of the furnace cover and welding, the auxiliary hoisting pulley block can be used for loosening and hoisting the next split furnace cover;
(d) after the hoisting of the three-petal peripheral furnace cover in the furnace is finished by the same method, the 2-petal peripheral furnace cover is hoisted to the furnace bottom by the same method and then installed;
(e) directly installing the furnace cover of the peripheral section of the last segment at the elevation of workshop operation by using a main winch;
E. hoisting and mounting of middle-range furnace cover
After the movable hoisting equipment is matched with a main winch to send the middle-amplitude segment split furnace cover into the workshop one by one, the main winch and an auxiliary winch independently complete hoisting operation;
the mounting sequence is that the furnace covers are mounted from the north to the two sides according to the mounting sequence of the peripheral furnace covers, and finally, the south-most valve is embedded;
after the middle-section furnace cover and the peripheral-section furnace cover are connected well by bolts, a temporary hanger can be installed by directly leveling by using a level gauge, and the temporary hanger is fixed on a workshop operation elevation steel structure by using channel steel;
F. hoisting and mounting of center-section split furnace cover
And after the movable hoisting equipment is matched with the main winch to send the central furnace cover into the workshop section by section, the main winch and the auxiliary winch independently complete hoisting operation.
The beneficial effect of this technique is:
the furnace cover inversion and furnace cover installation process overcomes the influence on the furnace cover lifting and installation operation after the factory building roof and the rain-proof system are formed, and safely, simply and conveniently lifts and installs the furnace cover.
As an improvement on the technology, the furnace cover inversion and furnace cover installation technology further comprises a furnace cover pressure test step of using a furnace cover pressure test system to carry out split furnace cover block-by-block pressure test before the furnace cover is inverted and the furnace cover is installed by utilizing a mobile lifting device and a winch in cooperation with a pulley block.
The furnace cover pressure test system comprises a split furnace cover internally provided with a furnace cover channel, a pressure test pipeline, a water inlet ball valve, a pressure gauge and a water outlet ball valve, wherein the pressure test pipeline is communicated with a water tank at one end and a water inlet of the furnace cover channel in a sealing way at the other end through a pressurizing pump; the medium is water.
The pressure test step of the furnace cover is as follows: opening a water inlet ball valve and a water outlet ball valve, starting a pressurizing pump, injecting water into the furnace cover channel and removing air in the furnace cover channel, and then closing the water outlet ball valve; when the pressurizing pump increases the water pressure to the value indicated by the pressure gauge as the design pressure, the pressurizing pump and the water inlet ball valve are sequentially closed to perform pressure maintaining for half an hour without pressure drop, and the water outlet ball valve can be opened to drain and release water after confirmation; and pressing the next furnace cover.
As a further improvement of the technology, 2 chain blocks and steel wire rope front and back sealing vehicles are adopted during the furnace cover transportation.
Drawings
FIG. 1 is a schematic view of a split furnace shell handling system 1;
FIG. 2 is a schematic view of a split furnace shell handling system 2;
FIG. 3 is view 1-1 of FIG. 1;
FIG. 4 is a schematic view of the base structure of FIG. 1;
FIG. 5 is a schematic view of the base structure of FIG. 2;
FIG. 6 is a flow chart of the construction process of the electric furnace body and the electric furnace workshop;
FIG. 7 is a schematic view of furnace bottom insulation installation 1;
FIG. 8 is a schematic view of furnace bottom insulation installation 2;
FIG. 9 is a schematic view of a steel structure of a factory building and a hoisting radius of a 50-ton truck crane;
FIG. 10 is a schematic view of a steel structure of a plant;
FIG. 11 is a schematic view of a furnace lid pressure test system;
FIG. 12 is a flow chart of the lid inversion and lid installation process;
FIG. 13 is a schematic view of a radius positioning line and an angle positioning line of a peripheral segment furnace lid;
FIG. 14 is a schematic view of an 8 ton hoist in combination with a main hoist block and rope winding;
FIG. 15 is a schematic view of a peripheral furnace cover g1 for handling and hoisting;
FIG. 16 is a schematic view of the handling and hoisting sub-process (b) of the peripheral furnace cover g 1;
FIG. 17 is a schematic view of a peripheral furnace cover g1 for handling and hoisting in the sub-process (c);
FIG. 18 is a schematic view of a peripheral furnace cover g1 for handling and hoisting in the sub-process (d);
FIG. 19 is a schematic view of a peripheral furnace cover g1 for handling and hoisting in the sub-process (e);
FIG. 20 is a schematic view of the ring line of the furnace shell in the position of the bottom plate;
FIG. 21 is a schematic view of the construction of the furnace lid;
FIG. 22 is a schematic view of a hoisting site;
FIG. 23 is another schematic view of the hoisting site;
fig. 24 is another schematic view of the plant steel structure and 50 ton truck crane hoisting radius.
Detailed Description
The present technology is further described with respect to specific embodiments in conjunction with the following figures:
referring to fig. 6, 9, 10, 12-22, a furnace cover upside-down mounting and furnace cover mounting process comprises an electric furnace workshop (also described as a factory building in the present case) c formed by a steel structure c2, a roofing and defense system c3, a furnace shell k which is already mounted and in place, and a split furnace cover g4 which comprises a peripheral section furnace cover g1, a middle-width section furnace cover g2 and a central section furnace cover g 3; the device comprises a flat car for transporting a split furnace cover g4 to a field storage yard y1, a mobile hoisting device for hoisting and installing the split furnace cover g4, a main hoisting system with a main hoisting machine matched with a main hoisting pulley block, an auxiliary hoisting system with an auxiliary hoisting machine matched with an auxiliary hoisting pulley block, a chain block for correcting the moving direction of the split furnace cover g4 in the process of hoisting and installing the split furnace cover g4, and the technology further comprises the technology of upside-down mounting the furnace cover and installing the furnace cover by utilizing the mobile hoisting device and the hoisting machine matched with the pulley block:
A. furnace cover positioning line
Setting radius positioning lines and angle positioning lines of a six-piece peripheral section furnace cover g1 at a position where a furnace cover g is arranged at the top of a furnace shell k by using a total station;
B. furnace cover transporting
Transporting the split furnace covers g4 to a field storage yard y1 by using a flat car, wherein the transporting sequence is that the peripheral furnace covers g1 are transported firstly, then the middle-range furnace covers g2 are transported secondly, and finally the central furnace covers g3 are transported thirdly;
C. hoisting and mounting of peripheral furnace cover
(a) The movable hoisting equipment hoists the split furnace cover g4 to the elevation of the top of the furnace shell k in the electric furnace workshop, wherein the elevation is an operation elevation; slowly swinging the arm to be close to the electric furnace body to the maximum extent until one end of a split furnace cover g4 is 2m, and placing the split furnace cover on the elevation platform, wherein the position is a temporary detention position; a main hoisting pulley block hooking valving furnace cover g4 which is hung on the opposite side of the temporary detention position and is higher than the operation elevation is positioned at one end in the furnace and slowly moves into the furnace under the action of a main hoisting machine;
(b) when the gravity center of the split furnace cover g4 slides into the plant c, one end of each of the main winch and the movable hoisting equipment is hung and continues to slide into the furnace;
(c) when the outer ends of the split furnace covers hoisted by the movable hoisting equipment slide to the edge of the factory building, the hooks can be loosened, and the split furnace covers are hoisted independently by the main hoist and continue to slide into the furnace;
(d) after the main winch drags the sectioning furnace cover g4 to slide into the furnace, an auxiliary winch with a lifting point right above the center of the sectioning furnace cover g4 is matched with an auxiliary winch pulley block to descend from the height of the electric furnace workshop c higher than the operation elevation to hook the sectioning furnace cover g4, and is matched with the main winch to enable the sectioning furnace cover g4 to continuously move into the furnace;
(e) the auxiliary winch is mainly hung, the main winch gives restraint force for inward sliding of the split furnace cover g4, the split furnace cover g4 stably and slowly moves into the furnace until the gravity center of the split furnace cover g4 and the hook head of the auxiliary winch are on the same vertical line, and the restraint force of the main winch can be cancelled;
in the process of lifting the furnace cover at the periphery section, the moving direction of the split furnace cover g4 is finely adjusted and corrected in real time by using a chain block and flexibly selecting a lifting point;
D. the furnace cover at the peripheral section is installed from the north to the two sides, and finally, the south-most side flap is embedded
(a) The auxiliary hoisting pulley block lifting point is adjusted to be right above the installed sectioning furnace cover g4, the sectioning furnace cover g4 is hooked, lifted and pre-tensioned, and during the process, the sectioning furnace cover g4 is accurately positioned by using chain block matching;
(b) after the split furnace cover g4 is placed on a positioning line at the top of the furnace shell k, a level gauge is erected at the position where the elevation is lower than the operation elevation for adjusting the elevation of the furnace cover, after the position line and the elevation of the furnace cover are adjusted, the furnace cover starts to be temporarily hung, and the steel structure c2 at the operation elevation is hung by using channel steel for temporary hanging.
(c) After temporary hanging installation of the furnace cover and welding, the auxiliary hoisting pulley block can be used for loosening and hoisting the next split furnace cover g4, and the next split furnace cover g4 needs to be matched with a chain block before hoisting;
(d) after the three-petal peripheral section furnace cover g1 in the furnace is hoisted by the same method, the 2-petal peripheral section furnace cover g1 is hoisted to the furnace bottom and then is installed;
(e) the furnace cover g1 at the peripheral section of the last segment is directly installed in place at the working elevation of the workshop by using a main winch;
E. hoisting and mounting of middle-range furnace cover
After the movable hoisting equipment is matched with the main winch to send the middle-amplitude furnace cover g2 into the plant c one by one, the main winch and the auxiliary winch independently complete hoisting operation;
the mounting sequence is that the furnace covers are mounted from the north to the two sides according to the mounting sequence of the peripheral furnace covers, and finally, the south-most valve is embedded;
after the middle-amplitude furnace cover g2 and the peripheral furnace cover g1 are connected by bolts, a temporary hanger can be installed by directly leveling by a level gauge, and the temporary hanger is fixed on a workshop operation elevation steel structure by using channel steel;
F. hoisting and mounting of center-section split furnace cover
After the movable hoisting equipment is matched with the main hoist to send the central furnace cover g3 into the workshop section by section, the main hoist and the auxiliary hoist independently complete hoisting operation.
Referring to fig. 1 to 5, the electric furnace body in this example mainly includes a base z disposed on a base c1 of an electric furnace shop c of a steel structure, a furnace shell k mounted on the base z, a furnace cover g covering an upper opening of the furnace shell k, and a furnace cover hanging system disposed on the furnace cover g, wherein the furnace shell k and the furnace cover g are mainly disposed between ± 0.000m to +10.262m of a main shop of the ferronickel electric furnace.
The base (furnace bottom plate) z comprises two parts of furnace bottom air-cooled I-shaped steel z3 fixedly connected to an electric furnace workshop foundation c1 and a bottom plate z2 laid on the furnace bottom air-cooled I-shaped steel z 3.
The furnace shell k of the vertical cylindrical structure is formed by connecting 10-piece furnace shell single bodies (split furnace shells) k1 through spring steel plates (not shown in the figure) into a whole. Every two adjacent split furnace shells can be lapped and fixedly connected by 11 spring steel plates with the thickness of 30mm (t =30 mm), the top and the bottom of every two adjacent split furnace shells are connected by high-strength bolts (not shown in the figure), so that the furnace shell k is expanded in a spherical surface manner in the production process, and the inner cavity of the furnace shell k is a hearth k 3.
An insulating plate j made of ceramic fiber plates is used as an insulating partition between a furnace shell and a furnace bottom plate z, a furnace cover g is used for sealing a hearth k3, reducing heat loss and improving the working conditions of a smelting interval, and a furnace cover hanging system d is vertically and fixedly connected between the furnace cover g and a steel structure of an electric furnace workshop c. Referring to fig. 21, the furnace cover g is a disk-like structure as a whole, and is composed of 6-segment peripheral furnace covers g1, 6-segment middle-width furnace covers g2 and 3-segment central-section furnace covers g4 which are uniformly distributed along the circumferential direction and fixedly connected through high-strength bolts (for simplicity, the peripheral-segment furnace covers g1, the middle-width furnace covers g2 and the central-section furnace covers g3 are collectively referred to as split furnace covers g 4). The two adjacent split furnace covers g4 are connected by bolts, an organic mica plate (not shown in the figure) is used as an insulator between the split furnace covers g4, and a sleeve and a gasket (not shown in the figure) made of organic mica are also used as insulators between the bolts and the split furnace covers. The furnace cover hanging system d is formed by uniformly distributing 12 steel pipes made of phi 89 stainless steel on the furnace cover and hanging the steel pipes on steel beams +12.360m, +15.200m, +19.000m of an electric furnace workshop. Wherein the furnace cover and the hanging space, and the hanging and the steel beam of the factory building are insulated by organic mica base plates (not shown in the figure). The furnace lid is insulated from the furnace shell by a brick ring (not shown).
The electric furnace adopts alternating current electric smelting, the transformer capacity is 33MVA, an 11MVA single-phase transformer is adopted to supply power to the electric furnace, the primary voltage is 35KV, and the electrode current density is 3.99A/cm2Because the ferronickel electric furnace converts low-voltage and large-current electric energy into heat energy, current passes through the main equipment.
The pole center circle z4 in this example is a circle made on the upper surface of the base with the installation reference point of 0.00m and the three-phase electrode pole center reference point as the centers of circles and the half of the sum of the inner diameter and the outer diameter of the bottom of an ideal furnace shell as the diameter.
In this example, the insulating plate j is a finished plate made of a ceramic fiber plate.
The electric furnace body construction and installation process comprises the following steps of:
the construction preparation work, including the inspection, acceptance of furnace body structure, construction equipment, the clearance of job site, the tee bend one of haulage road y and hoist and mount place (including stock yard y 1) is flat etc. for prior art, and this need not be repeated.
Installing a base on the foundation:
mounting furnace bottom steel beam on foundation
The furnace bottom steel beams z1 are 45# I-steel z3, and are arranged in a space arrangement mode according to the intervals of 400mm, 500mm and 730mm to form bent frames which are used for providing rigid support for the bottom plate z2 and forming an air duct z 11. Determining the center point of a furnace bottom steel beam z1 on a foundation c1 and drawing out a corresponding auxiliary line, wherein the furnace bottom steel beams z1 are arranged in sequence from the center to two sides, the I-steel z3 must be straight, each I-steel should be placed on a steel platform for checking and correcting the straightness and the bending degree before installation, the upper top surface of the I-steel z3 should be on the same horizontal plane, and the tolerance of flatness is allowed to be 4.5mm-5.5mm, and in the scheme, the tolerance of flatness is allowed to be 5 mm. When the device is installed, each I-steel z3 is allowed to receive material only once, the butt joint part is fully welded, and the upper surface and the lower surface of the welding part are polished to be flat. In order to level the elevation and levelness of the top plane of the I-steel z3 bent, leveling can be performed on the bottom of the furnace bottom steel beam by using a sizing block (not shown in the figure), the plane of the furnace bottom steel beam z1 and the base c1 are fully padded after leveling, and the sizing block, the bottom of the furnace bottom steel beam z1 and the sizing block need to be welded according to the related welding requirements.
After the furnace bottom steel beam z1 is installed, a sealing steel plate (not shown in the figure) in the furnace bottom air cooling device is welded, and an overhaul channel of the furnace bottom steel beam z1 foundation is sealed, so that air leakage during ventilation of the furnace bottom is avoided.
The circumferential line and the center line of the electric furnace are marked on the steel beam z1 at the bottom of the furnace according to the design position and are used as reference lines for positioning and aligning the bottom plate z 2.
Splice welding of base plates
The bottom plate z2 is assembled and placed according to the process number, then welding is carried out according to the relevant welding requirements, and the part higher than the bottom plate z2 needs to be polished to be flat.
The bottom plate z2 is formed by welding 7 single steel plates with the plate thickness of 30mm in a splicing manner, the bottom plate z2 is installed by hoisting the single steel plates onto a furnace bottom steel beam z1 and then carrying out pairing and welding, so that the center of the bottom plate z2, the center point of the furnace bottom steel beam z1 and the central axis of a furnace shell k are superposed, the error of the relative position of the center of the bottom plate z2 and the installation reference point of 0.00 meter and the reference point of the pole center of a three-phase electrode is not more than 8mm, the bottom plate z2 is required to be flat after welding, and the flatness tolerance is not more than.
After the bottom plate z2 is spliced and welded, the furnace bottom is aligned and positioned according to a pole center circle, three annular lines z6, z4 and z10 (shown in figure 20) at the position of a furnace shell k are drawn by the circle center z5 of the pole center circle, wherein the annular line z6 can be superposed with the outline of the bottom plate, the annular line z10 is the inner outline of the bottom of the furnace shell k, the annular line z10 is divided into ten equal parts, and an upper punching point z7 is punched at the intersection point of the equal division point and the diameter to serve as a positioning line for installing the split furnace shell k 1.
And (3) constructing the middle lower part of the steel structure of the electric furnace workshop c while installing the base z on the foundation, namely installing the steel structure of the 0-8.7m factory building.
Lifting and mounting the split furnace shell:
one segment of the split furnace shell is 75.756 tons in total weight of 6 segments, two segments of the split furnace shell are 12.731 tons in total weight of 1 segment of the split furnace shell, three segments of the split furnace shell are 12.731 tons in total weight, four segments of the split furnace shell are 12.731 tons in total weight of 1 segment, and 5 segments of the split furnace shell are 12.731 tons in total weight of 1 segment. The center of the furnace shell k is concentric with the center of the electric furnace, and the concentricity (coaxiality) tolerance of the furnace shell k is phi 10mm within the height range of the furnace shell k.
And lifting the split furnace shell k1 to the base z in a split manner and then assembling. Before hoisting, a surveyor needs to mark an arc-shaped positioning line at the inner side of each split furnace shell k1 and positioning axes at two ends of each split furnace shell on a bottom plate z2 by using a total station.
And taking the arc positioning line and the positioning axis as references, hoisting 10 split furnace shells k1 in place, and performing electric welding for preliminary alignment, and then detecting the verticality, the horizontal degree of the upper opening and the ellipticity by using a theodolite, a level gauge, a steel wire and a straight ruler. After the design and specification requirements are met through tests, 11 spring steel plates (not shown in the figure) with the thickness of 30mm (t =30 mm) are used for vertically and uniformly overlapping and fixedly connecting the middle parts of two adjacent split furnace shells k1 (welding).
And the top and the bottom of the two adjacent split furnace shells k1 are fixedly connected by using high-strength bolts.
After the furnace shell k is assembled, the cylindricity tolerance of the furnace shell k is 15 mm; the splicing and edge staggering quantity among the parts of the furnace shell k is not more than 4 mm.
The furnace shell needs to be strictly measured to determine whether the verticality and roundness of the furnace shell meet the design and specification requirements. If the requirements cannot be met, the alignment and leveling are required to be carried out again until the requirements are met, and the final shaping welding can be carried out.
The furnace shell installation and welding operation platform is provided with 1.2 m-1.2 m scaffolds or tripods (in the example, the scaffolds are arranged) along the circumferential direction of the outer wall of the furnace shell respectively, wood springboards are laid on the annular walkway for convenient operation and welding, the scaffolds (or the tripods) are arranged to be lifted layer by layer according to the welding requirements of the electric furnace, and the uppermost scaffold (the tripod) is arranged to be free from influencing the installation of the furnace shell.
Utilize ten lamella split furnace casees in alignment, welded period, the steel construction on electric stove workshop upper portion continues to be perfect to form rain-proof systems such as roofing and rain-proof, the electric stove workshop has formed rain-proof space this moment, can begin to install the ceramic fibre insulation between electric stove body stove outer covering and furnace body base.
And (5) installing the hoisting system for 12.36m when the 12.36m workshop steel structure is installed.
And (6) after the 12.36m winch system is installed, installing a steel structure from 12.36m to the roof of the factory building, and erecting a rain shed to create a rain-proof condition for insulating installation of the furnace bottom.
Furnace bottom insulation installation, see also fig. 7, fig. 8:
a horizontal centering measure steel plate z8 with the specification of 200mm x 150mm x 30mm is welded in an arc at the lower part of each split furnace shell k1 from a base z 450-450 mm-550mm (taking 500mm in the example).
After the welding of the measure steel plates z8 is completed, a 30t jack z9 is arranged at a position which is 165mm-175mm (170 mm in the example) away from the inner wall of the furnace shell k below each measure steel plate z8.
The jacks z9 are operated simultaneously by 10 persons each, and the jack operators are uniformly directed by one person in the furnace to press the 10 jacks z9 simultaneously by using a whistle. And (3) synchronously extending piston rods z10 of the jacks outwards to lift the furnace shell k by 18-22 mm (20 mm in the example), and then stopping, so that construction for lining the insulating plate j can be carried out.
An insulating plate j is lined from any position between the base z and the bottom of the furnace shell k to two sides, and the ceramic fiber plate is soft and brittle, so that the ceramic fiber plate needs to be lightly held in the installation process. When the ceramic fiber plate is installed, ceramic fiber plates can be paved from any position to two sides, and because the insulating plates are finished plates of manufacturers, no gap is formed when every two insulating plates are butted, so that the installation standard is met.
After a circle of insulating plate at the bottom of the furnace shell is laid, 10 persons loosen the jack z9 simultaneously, and the furnace shell k is vertically and accurately placed on the laid insulating plate j, so that the furnace body base z, the furnace body insulating plate j and the furnace shell k are completely installed, and the furnace cover g installation process can be carried out.
The furnace cover inversion and furnace cover installation process, namely the furnace cover inversion and the furnace cover installation technology by utilizing the mobile lifting equipment and the winch in combination with the pulley block, is shown in figure 12:
pressure testing at the furnace lid, see also FIG. 11
A furnace cover pressure test system s is adopted to undertake a furnace cover pressure test task, medium is water, the furnace cover pressure test system s comprises a split furnace cover k1 internally provided with a furnace cover channel s1, a pressure test pipeline s5 with one end communicated with a water tank s3 and the other end communicated with a furnace cover channel s1 water inlet s4 in a sealing mode is arranged on the pressure test pipeline s2, a water inlet ball valve s6 is connected in series between a pressurizing pump s2 and a furnace cover channel s1 water inlet s4 on the pressure test pipeline s5, a pressure gauge s7 is connected in parallel between a water inlet ball valve s6 and a furnace cover channel s1 water inlet s4 on the pressure test pipeline s1 water outlet s8 on the pressure test pipeline s1, and a water.
The experimental pressure of the furnace cover is 0.53 MPa; and (3) carrying out pressure test outside the field before the furnace cover g is installed, wherein the pressure test is carried out one by adopting a split furnace cover k 1.
And (3) opening a water inlet ball valve s6 and a water outlet ball valve s9, starting a pressurizing pump s2, injecting water into the furnace cover channel s1, exhausting air in the furnace cover channel s1, and closing the water outlet ball valve s 9.
When the pressurizing pump s2 increases the water pressure to a value indicated by a pressure gauge s7 of 0.53MPa, the pressurizing pump s2 and the water inlet ball valve s6 are sequentially closed to perform pressure maintaining for half an hour. During the pressure maintaining period, a pressurizing person carefully observes whether the water seepage phenomenon exists at the welding seam of the furnace cover, the pressure drop phenomenon does not exist after half an hour, and a supervision person of an owner confirms that the water outlet ball valve s9 can be opened at the rear part to drain water and release pressure, so that the next furnace cover is pressurized. If the pressure drop phenomenon exists and the welding seam does not leak, the furnace cover channels are not filled with water, air is possibly remained between the furnace cover channels, the volume of the air fused into the water is reduced or disappears to generate the pressure drop phenomenon after pressurization, the pressurizing pump is used for injecting water again, the water outlet is opened to discharge the air, and pressure testing is carried out again. If the pressure drop phenomenon exists in the pressure maintaining process and the water seepage phenomenon exists at the welding seam, the owner and the manufacturer are informed in time to carry out treatment.
Furnace cover positioning line
Referring to fig. 13, after the furnace shell k is positioned, a total station is used to place radius positioning lines and angle positioning lines of a six-segment peripheral furnace cover g1 at a position where the furnace cover g is installed on the top of the furnace shell k.
Furnace cover transporting
A50 t flat car is adopted to carry out split furnace covers g4 to be transported from a component workshop to a site storage yard y1, due to the fact that the site space is tight, a transporting sequence is reasonably arranged so that transporting and installation can be carried out simultaneously, the transporting sequence comprises transporting 6 outer section furnace covers g1, then transporting 6 middle section furnace covers g2 and finally transporting 3 central section furnace covers g 3. Because each valve split furnace cover has larger volume and is irregular, 2 tables of 2t chain blocks and phi 18mm (6 x 19) steel wire ropes are adopted for front and back vehicle sealing during reverse transportation. The whole transportation process requires the safety management personnel to supervise in the whole process.
Hoisting and mounting of peripheral furnace cover
After the electric furnace workshop c steel structure c2 and the roof rainproof system c3 are formed, namely an independent space is formed between +8.700m and +19.000m, the furnace cover can be installed in the space by utilizing the hoisting system, and because each layer is separated by the platform c4, the independent space is formed, the installation of the furnace cover g is not interfered with the specialties of pipelines, equipment, structures and the like, the installation operation can be carried out simultaneously, and the construction period is shortened to the maximum extent.
Each peripheral furnace cover g1 is 17 tons in weight, and the installation angle is deviated from the inner side of the steel structure c 2.
The peripheral furnace covers g1 are installed in sequence from the most north side of the factory building c, and then are installed symmetrically from two sides to the last flap of the south side.
The lifting and installation of the sectioning furnace cover g4 adopt 1 50-ton truck crane y2, 1 8-ton main winch y3 is matched with a main winch pulley block to be used as a main winch for lifting, 5-ton auxiliary winch y10 is matched with an auxiliary winch pulley block to be used as an auxiliary winch for lifting, and 3-ton chain hoist (not shown in the figure) is used as an auxiliary switching pulley block.
8 ton main hoist machine y3 sets up in 12.36m department in workshop A row and crosses the steel column of 9 lines, utilizes factory building steel column and supplementary shaped steel fixed, sets up one 20 ton direction single block y4 in B axle crossing 8 lines department, and direction single block y4 installation location requirement and 8 ton main hoist machine y3 wire rope reel y7 level are perpendicular, and the vertical permissible verticality deviation is 6 degrees, can make the wire rope circle arrange neatly like this, do not have oblique winding and fold extrusion mutually. And main hoisting pulley block hoisting points are arranged at 19m and 7-8 shaft intersection B columns of the workshop, auxiliary hoisting pulley block hoisting points are arranged on 19m steel beams right above the installation of the split furnace shells g4, and the main hoisting pulley blocks are transferred to the hoisting points under the assistance of 3-ton chain blocks according to the installation condition. The main hoisting pulley block is a 4-4 type 32 ton pulley block (the rope winding mode is shown in the figure 14, a steel wire rope y8 penetrates through a fixed pulley of a fixed pulley block y5 and a movable pulley of a movable pulley block y6 alternately from a steel wire rope reel y 7).
8 ton hoist engine is as hoist and mount main hoist, and its lifting capacity's calculation:
f = (G thing + G movement)/n
=（20000kg*9.8Kg·m/s2+400kg*9.8Kg·m/s2）/8
=25500m/s2
25500m/s2÷9.8Kg·m/s2=2500kg=2.5t
Namely: 8t hoisting force is more than 2.5 tons of pulling force
Wherein F is the pulling force born by the winding when the furnace cover is hoisted, G is the weight of the split furnace cover, G is the weight of auxiliary hoisting objects such as the movable pulley block and the steel wire rope, and n is the number of the steel wire rope strands of the movable pulley.
And a steel plate y9 with the thickness not less than 2mm is laid on the top of the furnace shell k and the platform c4 to protect the top of the furnace shell k, the split furnace cover g4 and the platform c 4.
And three peripheral furnace covers g1 are continuously transported and placed in the electric furnace body, and then are hoisted piece by piece.
When the hoisting sub-process of the peripheral furnace cover g1 is implemented, the following steps are carried out:
(a) referring to fig. 15 again, a 50-ton truck crane y2 hoists the split furnace cover g4 to 12.36m of the shaft/7-8 of the column A of the electric furnace workshop, and then slowly swings to be close to the electric furnace body to the maximum extent, and at the moment, about 2m of one end of the split furnace cover g4 is placed on a platform of 12.36 m; the main hoisting pulley block hung at the B line of the 7-8 axles crossing is hooked with a valving furnace cover g4 at one end in the furnace and slowly moves into the furnace under the action of an 8-ton main hoisting machine y 3.
(b) Referring to fig. 16, when the gravity center of the split furnace cover g4 slides into the factory, one end of each of the 8-ton main hoist y3 and the 50-ton truck crane y2 continues to slide into the furnace along the direction y 11.
(c) Referring to fig. 17, when the outer end of the split furnace cover g4 hoisted by a 50-ton truck crane y2 slides to the edge of the factory building, the hook can be released, and the split furnace cover is independently hoisted by an 8-ton main hoist y3 and continues to slide into the furnace.
(d) Referring to fig. 18 again, after the 8-ton main winch y3 drags the sectioning furnace cover g4 to the maximum extent to slide into the furnace, the 5-ton auxiliary winch y10 with the lifting point right above the center position of the sectioning furnace cover g4 is matched with the auxiliary winch pulley block to descend to 12.36m from the electric furnace workshop 19m and is hooked on the sectioning furnace cover g4, and the 8-ton main winch y3 is matched to make the sectioning furnace cover g4 continuously move into the furnace.
(e) Referring to fig. 19, the 5-ton auxiliary hoist y10 is used for main hoisting, the 8-ton main hoist y3 provides a restraint force for inward sliding of the sectioning furnace cover g4, so that the sectioning furnace cover g4 stably and slowly moves into the furnace until the gravity center of the sectioning furnace cover g4 and the hook head of the 5-ton auxiliary hoist y10 are on the same vertical line, and the restraint force of the 8-ton main hoist y3 can be cancelled.
In the process of lifting the peripheral furnace cover g1, 3 tons of chain blocks are used, lifting points are flexibly selected, and the moving direction of the split furnace cover g4 is finely adjusted and corrected in real time.
In this way, a 3-lobe peripheral furnace lid g1 is placed on the base z.
When the installation of the peripheral furnace cover g1 is carried out:
the auxiliary hoisting pulley block lifting point is adjusted to be right above the installed sectioning furnace cover g4, the sectioning furnace cover g4 is hooked and lifted and/or pretension is applied, and 3 tons of chain-reversing matching can be used for accurately positioning the sectioning furnace cover g4 in the process.
When the split furnace cover g4 is placed on a positioning line of a brick ring (not shown in the figure) on the top of the furnace shell k, a leveling instrument is erected at 8.7m to adjust the elevation of the furnace cover g, after the position line and the elevation of the furnace cover g are adjusted, a temporary hanging of the furnace cover g is started, and the temporary hanging is hung on a steel structure at 12.36m by using a 16a channel steel.
After the furnace cover is temporarily hung and installed and welded, the auxiliary hoisting pulley block can be used for loosening and hoisting the next split furnace cover g4, and 3 tons of chain blocks are also needed to be matched before hoisting the next split furnace cover.
And by analogy, after the three-valve peripheral section furnace cover g1 in the furnace is hoisted, hoisting the 2-valve peripheral section furnace cover g1 to the bottom of the furnace by the same method and then installing.
The last peripheral segment furnace lid g1 was installed in place directly at room ∑ 12.36m starting with the 8 ton main hoist y 3.
Hoisting and mounting of middle-range furnace cover
The weight of the middle-amplitude segment 6-segment split furnace cover g4 is within 10 tons, the shape is regular, a 50-ton truck crane y2, an 8-ton main winch y3, a 5-ton auxiliary winch y10 and a 3-ton chain hoist are adopted for hoisting, wherein the 50-ton truck crane y2 is matched with the 8-ton main winch y3 to send the middle-amplitude segment split furnace cover g4 into a workshop c in a split mode, and the 8-ton main winch y3 and the 5-ton auxiliary winch y10 independently complete hoisting operation.
The installation sequence is that the furnace cover g1 is installed from north to two sides, and finally the south-most side is inlaid.
The middle-range furnace cover g2 is connected with the positioned peripheral furnace cover g1 through bolts, so that a temporary hanger can be installed by directly leveling the middle-range furnace cover g2 and the peripheral furnace cover g1 through bolts through a leveling instrument, and the temporary hanger is also fixed on a steel structure of the building & lang 12.36m through a 16a channel steel.
Hoisting and mounting of center-section split furnace cover
The central furnace cover g3 is a three-section split furnace cover g4, each section of the cover weighs about 5 tons, and the inner side of the middle-amplitude six-section split furnace cover is connected by bolts. The central furnace cover g3 three-section split furnace cover g4 is installed by adopting a 50-ton truck crane, an 8-ton main winch, a 5-ton auxiliary winch and a 3-ton chain hoist, wherein after the 50-ton truck crane is matched with the 8-ton main winch to gradually feed the central furnace cover into a workshop, the 8-ton main winch and the 5-ton auxiliary winch independently complete hoisting operation.
Furnace cover hanger and furnace cover accessory installation
After the installation of each split furnace shell k1 of the furnace cover is finished, a furnace cover hanger (not shown in the figure) can be installed, the furnace cover hanger is also installed from the peripheral section to the central section, and holes can be formed on steel structure steel beams as hanging points after the furnace cover hanger is projected to the hanging points of the upper steel structure according to the actual central point of each hanger of the furnace cover during installation, so that the vertical stress of the furnace cover hanger is kept.
And (5) setting a lifting point at 19m of the workshop, and mounting a furnace cover for hanging by using a 3-ton winch.
After the furnace cover is hung and installed, technicians confirm whether the hanging bolt is good in connection condition, after the connection state of each hanging point is good, the temporary hanging points of each split furnace cover can be disassembled, and the furnace cover g and the base metal of the steel structure c2 are protected during cutting of the temporary hanging.
The furnace cover is hung and installed, and a detection door, an access cover, a detection door, a furnace pressure taking-out device and a sealing cover of the furnace cover can be installed at the same time.
Mounting, inspecting insulation of furnace lid
In the whole installation process of the furnace cover g, the furnace cover is installed in an insulating way, namely, each split furnace cover g4 is installed and the last split furnace cover g4 is insulated and separated from each other by taking an organic silicon mica plate as a base plate, then the two-split furnace cover g4 is connected into a whole by bolts, wherein the bolts for connecting the two-split furnace cover g4 are insulated by bolt sleeves and gaskets made of organic silicon mica materials and the two-split furnace cover.
The installation of a furnace cover hanger and the installation of hanger insulation are carried out simultaneously, the furnace cover hanger is a tubular rod piece for connecting the furnace cover and a plant steel structure, the hanger and a hanger on a +12.36m structural beam of a plant are insulated at two positions, namely, the connection position of the hanger and the furnace cover is insulated by an organic silicon mica plate, and the connection position of the hanger and the structural steel beam is also insulated by the organic silicon mica plate. The hanging on the structural beams of the hanging and factory building +15.200m and 19.000m is provided with three parts of insulation, namely, the joint of the hanging and the furnace cover is insulated by an organic silicon mica plate, the hanging is divided into two sections which are connected by bolts and insulated by the organic silicon mica plate, and the joint of the hanging and the structural steel beam is insulated by the organic silicon mica plate.
The insulating mounting points of the furnace cover and the hanger are multi-faceted and wide, the insulation needs to be integrally checked after the mounting is finished, whether steel connection exists between the furnace cover and the furnace shell, between the furnace cover and a workshop steel structure and among all sections of the furnace cover or not is carefully checked, and if yes, disconnection processing is carried out; after the inspection and the removal are finished, the electric welding machine is used for inspecting the insulation between the furnace cover and the furnace shell, between the furnace cover hanger and the plant structure, between the furnace cover flaps and between the furnace cover and the bolts, and the welding handle is qualified when not ignited.
The beneficial effect of this technique is:
according to the electric furnace bottom insulation and furnace shell inverted installation process, the insulation plate between the furnace shell and the base is installed by adopting the process, the influence of external conditions on construction is avoided, the defect that the insulation layer is damaged due to poor structural strength and easy external force action during normal installation in sequence is overcome, and the insulation installation quality is ensured.
Claims (5)
1. A furnace cover inversion and furnace cover installation process is characterized by comprising an electric furnace workshop formed by a steel structure, a roof and a defense system, and a furnace shell which is installed and in place, wherein the furnace shell comprises a peripheral section furnace cover, a middle-width section furnace cover and a central section furnace cover; the flat car for transporting the split furnace cover to a field storage yard is used for lifting and installing a mobile lifting device of the split furnace cover, a main lifting system consisting of a main winch and a main lifting pulley block, an auxiliary lifting system consisting of an auxiliary winch and an auxiliary lifting pulley block, a chain block for correcting the moving direction of the split furnace cover in the lifting and installing process of the split furnace cover, and the steps of inversely installing the furnace cover and installing the furnace cover by utilizing the mobile lifting device and the winch to cooperate with the pulley block are also included:
A. furnace cover positioning line
Setting radius positioning lines and angle positioning lines of a six-segment peripheral furnace cover at a position where a furnace cover is installed on the top of a furnace shell by using a total station;
B. furnace cover transporting
Transporting the split furnace covers to a field storage yard by using a flat car, wherein the transporting sequence is that transporting the peripheral furnace covers firstly, transporting the middle furnace covers secondly and transporting the central furnace covers secondly;
C. hoisting and mounting of peripheral furnace cover
(a) The movable hoisting equipment hoists the split furnace cover to a height mark at the top of the furnace shell of the electric furnace workshop, wherein the height mark is an operation height mark; slowly swinging the arm to be close to the electric furnace body to the maximum extent, and placing 2m to one end of the split furnace cover on an operation elevation platform which is a temporary detention position; a main hoisting pulley block hook split furnace cover which is hung on the opposite side of the temporary detention position and is higher than the operation elevation is positioned at one end in the furnace, and slowly moves into the furnace under the action of a main hoisting machine;
(b) when the gravity center of the split furnace cover slides into the plant, one end of each of the main winch and the movable hoisting equipment is hoisted, and the split furnace cover continues to slide into the furnace;
(c) when the outer end of the split furnace cover hoisted by the movable hoisting equipment slides to the edge of the factory building, the hook can be loosened, and the split furnace cover is hoisted independently by the main hoist and continues to slide into the furnace;
(d) after the main winch drags the sectioning furnace cover to slide into the furnace, an auxiliary winch with a lifting point right above the center of the sectioning furnace cover is matched with an auxiliary winch pulley block to descend from the height of the electric furnace workshop higher than the operation elevation to the operation elevation, is hooked on the sectioning furnace cover and is matched with the main winch to enable the sectioning furnace cover to continuously move into the furnace;
(e) the auxiliary winch is mainly hung, and the main winch gives an inward sliding constraint force to the split furnace cover so that the split furnace cover stably and slowly moves towards the inside of the furnace until the gravity center of the split furnace cover and the hook head of the auxiliary winch are on the same vertical line, so that the constraint force of the main winch can be cancelled;
D. installing a furnace cover at the peripheral section, wherein the installation sequence is that the furnace cover is installed from the north to the two sides, and finally embedding a valve at the south most side;
(a) adjusting the lifting point of the auxiliary hoisting pulley block to a position right above the installed sectioning furnace cover, hooking the sectioning furnace cover, lifting and applying pretension, and positioning the sectioning furnace cover in place by using chain block matching in the period;
(b) after the split furnace cover is placed on a positioning line at the top of the furnace shell, a level gauge is erected at the position where the elevation is lower than the operation elevation for adjusting the elevation of the furnace cover, after the position line and the elevation of the furnace cover are adjusted, temporary hanging of the furnace cover is started, and the temporary hanging is hung on a steel structure with the operation elevation by using channel steel;
(c) after temporary hanging installation of the furnace cover and welding, the auxiliary hoisting pulley block can be used for loosening and hoisting the next split furnace cover;
(d) after the three-segment peripheral furnace cover in the furnace is hoisted, hoisting the 2-segment peripheral furnace cover to the furnace bottom by the same method and then installing;
(e) directly installing the furnace cover of the peripheral section of the last segment at the elevation of workshop operation by using a main winch;
E. hoisting and mounting of middle-range furnace cover
After the movable hoisting equipment is matched with a main winch to send the middle-amplitude segment split furnace cover into the workshop one by one, the main winch and an auxiliary winch independently complete hoisting operation;
the mounting sequence is that the furnace covers are mounted from the north to the two sides according to the mounting sequence of the peripheral furnace covers, and finally, the south-most valve is embedded;
after the middle-section furnace cover and the peripheral-section furnace cover are connected well by bolts, a temporary hanger can be installed by directly leveling by using a level gauge, and the temporary hanger is fixed on a workshop operation elevation steel structure by using channel steel;
F. hoisting and mounting of center-section split furnace cover
And after the movable hoisting equipment is matched with the main winch to send the central furnace cover into the workshop section by section, the main winch and the auxiliary winch independently complete hoisting operation.
2. The furnace cover inversion and furnace cover installation process as claimed in claim 1, further comprising a furnace cover pressure test step of performing a pressure test on the furnace cover piece by using a furnace cover pressure test system before the furnace cover is inverted and the furnace cover is installed by using a mobile lifting device and a winch in cooperation with a pulley block.
3. The furnace cover inversion and furnace cover installation process as claimed in claim 2, wherein the furnace cover pressure test system comprises a split furnace cover with a furnace cover channel arranged therein, a pressure test pipeline with one end communicated with the water tank and the other end communicated with a water inlet of the furnace cover channel in a sealing manner through a pressurizing pump, a water inlet ball valve connected in series on the pressure test pipeline and between the pressurizing pump and the water inlet of the furnace cover channel, a pressure gauge connected in parallel between the water inlet ball valve and the water inlet of the furnace cover channel, and a water outlet ball valve arranged at a water outlet of the furnace cover channel in a sealing; the medium is water.
4. The furnace cover inversion and furnace cover installation process as claimed in claim 3, wherein the furnace cover pressure test process comprises the following steps: opening a water inlet ball valve and a water outlet ball valve, starting a pressurizing pump, injecting water into the furnace cover channel and removing air in the furnace cover channel, and then closing the water outlet ball valve; when the pressurizing pump increases the water pressure to the value indicated by the pressure gauge as the design pressure, the pressurizing pump and the water inlet ball valve are sequentially closed to perform pressure maintaining for half an hour without pressure drop, and the water outlet ball valve can be opened to drain and release water after confirmation; and pressing the next furnace cover.
5. The process for upside-down mounting of the furnace cover and installing the furnace cover as claimed in claim 1, wherein 2 chain blocks and a steel wire rope front and rear vehicle block are adopted during the transportation of the furnace cover.
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