CN114507773A - Online quick replacement method for W-shaped radiant tube of continuous annealing furnace - Google Patents
Online quick replacement method for W-shaped radiant tube of continuous annealing furnace Download PDFInfo
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- CN114507773A CN114507773A CN202011274569.9A CN202011274569A CN114507773A CN 114507773 A CN114507773 A CN 114507773A CN 202011274569 A CN202011274569 A CN 202011274569A CN 114507773 A CN114507773 A CN 114507773A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
Abstract
The invention relates to an online quick replacement method for a W-shaped radiant tube of a continuous annealing furnace, which comprises the following steps: s1, extracting the radiant tube: s2, fixing a 1-ton chain block on a steel structure in the upper platform to hang the upper tube body of the radiant tube, S3, hanging 5 radiant tubes down to the furnace by using a manufactured hanger, S4, hanging 5 new radiant tubes in the same way, wherein the hanging point is at a position about 500mm away from the upper flange of the radiant tube, S5, after the gravity center of the radiant tube enters the platform, replacing a crane hook by using a 2-ton chain block on an outer structure beam at the lower part of an upper platform in S1, S6, arranging a block on the upper radiant tube in the furnace, S7, ensuring the inclined support distance from the head of the radiant tube to the furnace wall to be more than 64mm during installation, and S8, placing a heat insulation sealing strip at the interface between the inner part of the outer frame of the radiant tube and the furnace door when the radiant tube is inserted; and S9, spot welding the four corners of the outer frame and the furnace mouth after the radiant tube is in place, and separating the radiant tube from the gourd after temporary fixation.
Description
Technical Field
The invention relates to a replacing method, in particular to an online quick replacing method for a W-shaped radiant tube of a continuous annealing furnace, and belongs to the technical field of iron-based alloys.
Background
The radiant tube is a heating device of the cold-rolled strip steel annealing furnace, and gas and air are injected into the radiant tube through a burner to burn, so that heat is transferred to strip steel in the furnace for annealing, and the working state of the radiant tube directly influences the annealing quality of the strip steel. The body material of radiant tube is high temperature resistant stainless steel, adopts the centrifugal casting to form, and the body welds into W shape, and the import has welded the flange of being connected with the nozzle, for preventing that the heat in the stove gives off, and inside is equipped with insulation construction. In order to facilitate replacement, the outer frame of the radiant tube and the furnace wall are designed into an airtight welding structure, and a welding opening is cut by gas cutting during replacement. The radiant tubes are arranged in the heating section of the annealing furnace unit, are numerous and are arranged in parallel with the strip steel. The dead weight of the radiant tube is about 0.7 ton (the weight is slightly different due to different specifications), the working temperature of the radiant tube is higher than 800 ℃, the radiant tube is often subjected to plastic bending deformation, and in addition, the tube wall is easy to crack due to uneven heating and thermal fatigue of the tube body, so that the gas in the tube leaks to cause oxidation of strip steel, and the quality of the strip steel is influenced. The radiant tube belongs to a quick-wear part and needs to be replaced frequently. Therefore, a new solution to solve the above technical problems is urgently needed.
Disclosure of Invention
The invention provides an online quick replacement method of a W-shaped radiant tube of a continuous annealing furnace aiming at the problems in the prior art, solves the problems that a set of large-scale special radiant tube lifting appliance is required to be used in the original method, the maintenance travelling crane is always occupied in the replacement process, the operation is inconvenient and the like, and simultaneously provides a radiant tube fixing and furnace mouth repairing method after a new radiant tube is inserted into the furnace.
In order to achieve the purpose, the technical scheme of the invention is that the method for rapidly changing the W-shaped radiant tube of the continuous annealing furnace online is characterized by comprising the following steps:
s1, extracting the radiant tube: before the radiant tube is replaced, the external pipeline heat preservation, the burner and the gas pipeline are firstly removed, and the welding seam between the furnace mouth and the outer frame of the radiant tube is cut by gas. 2 sets of 2-ton chain blocks (called as blocks below) are respectively arranged at corresponding positions outside the furnace where the radiant tubes need to be replaced, one is arranged on a structural beam at the lower part of the upper-layer platform close to the outside, and the other is arranged on a structural beam at the upper part of the lower-layer platform close to the outside; the other end is respectively fastened on the upper flange and the lower flange of the radiant tube by a phi 20 steel wire rope, the radiant tube is directly pulled out of the furnace mouth by utilizing the matching of 2 hoists,
s2, fixing a 1-ton chain block on a steel structure in the upper platform to hang the upper tube body of the radiant tube, hanging the upper tube body of the radiant tube by the 1-ton chain block when the radiant tube is pulled out of the furnace mouth by about 600mm, pulling the radiant tube to the edge of the furnace platform by matching with a travelling crane, and drawing out 5 parallel radiant tubes to the edge of the platform by the same method.
S3, using the prepared hanger to hang 5 radiant tubes off the furnace at the same time,
s4, 5 new radiant tubes are hung in the same way, and the hanging point is about 500mm away from the upper flange of the radiant tube, wherein the hanging point is the center of gravity of the radiant tube. When the spreader is to the side of the furnace platform, the radiant tube is pulled to the platform using the 1 ton hoist on the inner steel structure of the upper platform in S2. Note that 5 calabashes were used to pull 5 radiant tubes into place simultaneously.
S5, after the gravity center of the radiant tube enters the platform, replacing a crane hook with a chain block of 2 tons on an outer structural beam at the lower part of an upper platform in the S1, matching 2 blocks to pull the radiant tube to the edge of the furnace mouth,
and S6, arranging a hoist on the upper-layer radiant tube in the furnace (the upper-layer radiant tube can be arranged at the opening of the furnace top when being replaced), and pulling the radiant tube into the furnace. And (4) paying attention to the arrangement of the gourd to be as close as possible to the root of the last radiant tube, and simultaneously confirming whether the radiant interface is welded firmly.
S7, the working temperature of the radiant tube is higher, the tube body can generate thermal expansion, so the distance between the head of the radiant tube and the furnace wall inclined support is ensured to be more than 64mm when the radiant tube is installed, and the radiant tube is used as an expansion and contraction space; meanwhile, the overlapping amount of the radiant tube supporting plate and the inclined support is ensured to be more than 60 mm. If the furnace wall is heated and deformed (generally expands outwards), an extension plate made of the same material and having the same thickness is welded on the supporting plate to ensure the overlapping amount.
S8, because the radiation tube body keeps warm and the furnace wall keeps warm and has a gap, the heat in the furnace can be transmitted to the interface through the gap, thereby changing the physical property of the interface metal and reducing the service life of the furnace mouth. When the radiant tube is inserted, a heat insulation sealing strip is arranged at the interface between the inner part of the outer frame of the radiant tube and the furnace door, the sealing strip is arranged in a ring shape, and the middle of the sealing strip cannot be interrupted.
And S9, spot welding the four corners of the outer frame and the furnace mouth after the radiant tube is in place, and separating the radiant tube from the gourd after temporary fixation. Checking the connection condition of the furnace mouth and the outer frame, if the interface is too large, the airtight welding is not favorable, the furnace mouth should be repaired at the moment to ensure that the fit clearance between the furnace mouth and the outer frame of the radiant tube reaches the minimum, the edge of the furnace mouth can be baked red by a cutting torch, the furnace mouth is knocked by a hand hammer to deform and approach the outer frame of the radiant tube, and finally, the airtight welding is carried out,
compared with the prior art, the invention has the advantages that,
1) the equipment is simple: the special lifting appliance for replacing the existing radiant tube generally comprises more than 10 components such as a lifting beam, a clamping mechanism, a plugging jack, a fixed base and the like, and the weight of the equipment is 5-6 tons; the invention only needs to fix 4 chain blocks of 1-2 tons on the platform of the annealing furnace and the structural beams of the corresponding area in the furnace, does not need to additionally increase equipment, and has simple equipment and small investment.
2) The operation is convenient: the existing radiant tube replacement uses a large-scale special radiant tube hanger, related operations can be completed only by operating a travelling crane and the radiant tube hanger at the same time, the travelling crane and the radiant tube hanger are far away from an operation point during the operation, and a specially-assigned person is needed to command during the processes of extracting an old radiant tube, inserting a new radiant tube and adjusting the new radiant tube; in the invention, the up-down and back-and-forth movement of the radiant tube can be completed only by 2-3 people by mutually matching and adjusting 4 chain blocks in the processes of extracting the old radiant tube, inserting the new radiant tube and adjusting, and the operation is simple and convenient.
3) The reliability is strong: the existing radiant tube replacement uses a large-scale special radiant tube hanger, and in the replacement process, because a crane and a radiant tube hanger are far away from an operation point, the crane action amplitude is large, and the radiant tube is difficult to control to be accurately positioned; the invention adjusts 4 chain blocks beside the machine by operating personnel, has small action amplitude, enables the radiant tube to move more stably in the installation and adjustment process, and is easy to accurately position the radiant tube. 4) The operation efficiency is high: the existing radiant tube replacement uses a large-scale special radiant tube hanger, and a travelling crane is always occupied in the replacement process; according to the invention, the crane only needs to hoist the old radiant tube down and the new radiant tube up, the extraction of the old radiant tube, the insertion and the adjustment of the new radiant tube are completed through the chain block, the crane does not need to be occupied, the crane can be inserted through other maintenance projects, and the operation efficiency is high. The invention also provides a set of radiant tube fixing technology after the new radiant tube is inserted into the furnace, which comprehensively considers the influence of the thermal deformation of the radiant tube and the furnace wall on the installation precision in the installation process of the radiant tube and ensures that the radiant tube does not generate thermal deformation in the subsequent production process. The invention also provides a furnace mouth repairing technology after the new radiant tube is inserted into the furnace, and the air tightness of the furnace mouth after the radiant tube is replaced can be effectively ensured by arranging the heat insulation strips and bending the edge of the furnace mouth.
Drawings
FIG. 1 is a schematic view of a radiant tube drawing furnace mouth;
FIG. 2 is a schematic view of the radiant tube drawn to the edge of the hearth;
FIG. 3 is a schematic view of 5 radiant tubes being synchronously suspended;
FIG. 4 is a schematic drawing of the new radiant tube pulled to the platform;
FIG. 5 is a schematic view of the radiant tube being pulled to the furnace mouth side;
FIG. 6 is a schematic drawing of the radiant tube drawn into the furnace;
FIG. 7 is a schematic view of the mounting dimensions of the radiant tube;
FIG. 8 is a schematic view of a seal strip installation;
FIG. 9 is a schematic view of a furnace mouth trim;
in the figure: 1. the furnace comprises a structural beam, 2, a chain block, 3, a furnace wall, 4, a radiant tube, 5, a travelling crane, 6, a lifting appliance, 7, a radiant tube supporting plate, 8, a furnace wall inclined support, 9, a furnace body heat preservation, 10, a furnace opening, 11, a radiant tube outer frame, 12, a sealing strip, 13 and a radiant tube heat preservation.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1, an online rapid replacement method for a W-shaped radiant tube of a continuous annealing furnace comprises the following steps:
s1, extracting the radiant tube: before the radiant tube is replaced, the external pipeline heat preservation, the burner and the gas pipeline are firstly removed, and the welding seam between the furnace mouth and the outer frame of the radiant tube is cut by gas. 2 sets of 2-ton chain blocks (called as blocks below) are respectively arranged at corresponding positions outside the furnace where the radiant tubes need to be replaced, one is arranged on a structural beam at the lower part of the upper-layer platform close to the outside, and the other is arranged on a structural beam at the upper part of the lower-layer platform close to the outside; the other end is respectively fastened on the upper flange and the lower flange of the radiant tube by a phi 20 steel wire rope, the radiant tube is directly pulled out of the furnace mouth by utilizing the matching of 2 hoists,
s2, fixing a 1-ton chain block on a steel structure in the upper platform to hang the upper tube body of the radiant tube, hanging the upper tube body of the radiant tube by the 1-ton chain block when the radiant tube is pulled out of the furnace mouth by about 600mm, and pulling the radiant tube to the edge of the furnace platform by matching with a travelling crane, as shown in figure 2. The 5 parallel radiant tubes are extracted to the side of the platform by the same method.
S3, using the prepared hanger to hang 5 radiant tubes off the furnace at the same time, see figure 3.
S4, 5 new radiant tubes are hung in the same way, and the hanging point is about 500mm away from the upper flange of the radiant tube, wherein the hanging point is the center of gravity of the radiant tube. When the spreader is to the side of the furnace platform, the radiant tube is pulled to the platform using the 1 ton hoist on the inner steel structure of the upper platform in S2. Note that 5 calabashes are used to pull 5 radiant tubes into position simultaneously, see fig. 4.
And S5, after the gravity center of the radiant tube enters the platform, replacing a crane hook with a chain block of 2 tons on an outer structural beam at the lower part of the upper platform in the S1, and drawing the radiant tube to the edge of the furnace mouth by matching 2 blocks, as shown in the attached figure 5.
S6, arranging a calabash (which can be arranged at the top opening of the furnace when the uppermost radiant tube is replaced) on the upper radiant tube in the furnace, and pulling the radiant tube into the furnace. And (4) paying attention to the fact that the gourd is arranged to be close to the root of the last radiant tube as much as possible, and simultaneously, whether the radiant interface is welded firmly is confirmed. See figure 6.
S7, the working temperature of the radiant tube is higher, the tube body can generate thermal expansion, so the distance between the head of the radiant tube and the furnace wall inclined support is ensured to be more than 64mm when the radiant tube is installed, and the radiant tube is used as an expansion and contraction space; meanwhile, the overlapping amount of the radiant tube supporting plate and the inclined support is ensured to be more than 60mm, see the attached figure 7. If the furnace wall is heated and deformed (generally expands outwards), an extension plate made of the same material and having the same thickness is welded on the supporting plate to ensure the overlapping amount.
S8, because the radiation tube body keeps warm and the furnace wall keeps warm and has a gap, the heat in the furnace can be transmitted to the interface through the gap, thereby changing the physical property of the interface metal and reducing the service life of the furnace mouth. When the radiant tube is inserted, a heat insulation sealing strip is arranged at the interface between the inner part of the outer frame of the radiant tube and the furnace door, the sealing strip is arranged in a ring shape, and the middle of the sealing strip cannot be interrupted. See figure 8.
And S9, spot welding the four corners of the outer frame and the furnace mouth after the radiant tube is in place, and separating the radiant tube from the gourd after temporary fixation. Checking the jointing condition of the furnace mouth and the outer frame, if the interface is too big, then the airtight welding is unfavorable, then the furnace mouth should be repaired, the fit clearance between the furnace mouth and the outer frame of the radiant tube is minimized, the furnace mouth edge can be baked red by using the cutting torch for repairing, the furnace mouth edge is knocked by using a hand hammer to deform and approach the outer frame of the radiant tube, and finally the airtight welding is carried out, see the attached figure 9.
The specific embodiment is as follows: referring to fig. 1-9, a 1420 continuous annealing unit replaces 24 deformed W-shaped radiant tubes on line in the method during the 9-month scheduled repair in 2018. The specific method comprises the following steps:
(1) two workers remove the pipeline heat preservation, the burner and the gas pipeline outside the 24 radiant tubes one by one and cut off the welding seams between the furnace mouth and the outer frame of the radiant tubes by gas cutting.
(2) The old radiant tube is sequentially pulled out of the furnace, 2 tons of chain blocks are respectively fixed on steel structures close to the outer sides of upper and lower platforms where the radiant tube to be replaced is located, a steel wire rope of the chain block is fastened on upper and lower flanges of the radiant tube, after the radiant tube is directly pulled out of a furnace opening by about 600mm by utilizing 2 blocks of the chain blocks, a 1 ton of chain block is fixed on the steel structure close to the inner side of the upper platform to hang a tube body on the radiant tube, and the radiant tube is pulled to the edge of a furnace platform in a matching mode.
(3) After the crane hoists the new radiant tube to the edge of the platform, a chain block of 1 ton fixed on a steel structure close to the inner side of the upper platform is used for hoisting the upper tube body of the radiant tube, and the radiant tube is pulled to the platform. After the gravity center of the radiant tube enters the platform, the upper flange is fastened by using a chain block of 2 tons fixed on a steel structure of the upper platform close to the outside, and the radiant tube is pulled to the edge of the furnace opening by using the matching of 2 blocks. And arranging a hoist on the upper radiant tube in the furnace, and pulling the radiant tube into the furnace. The installation size is adjusted, the distance between the head of the radiant tube and the furnace wall diagonal brace is more than 64mm, and the lap joint quantity of the radiant tube support plate and the diagonal brace is more than 60 mm.
(4) After the radiant tube is adjusted in place, the four corners of the outer frame, which are connected with the furnace mouth, are spot-welded by an electric welding machine, temporarily fixed, and then the radiant tube is separated from the gourd. And (4) finishing the furnace mouth to minimize the fit clearance between the furnace mouth and the outer frame of the radiant tube, and finally performing airtight welding.
The machine set has 24 deformed radiant tubes replaced in two days, and the quality and the safety are controlled. Compared with the original method, the method has the advantages that the task is completed 12 hours in advance, in addition, only intermittent use and maintenance of the travelling crane is realized in the replacement process, the travelling crane can be inserted to participate in other maintenance projects, and the working efficiency is obviously improved.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (5)
1. An online quick changing method for a W-shaped radiant tube of a continuous annealing furnace is characterized by comprising the following steps:
s1, extracting the radiant tube:
s2, fixing a 1 ton chain block on a steel structure in the upper platform to hang the upper pipe body of the radiant tube,
s3, using the prepared hanger to hang 5 radiant tubes off the furnace at the same time,
s4, hanging 5 new radiant tubes in the same way, wherein the hanging points are located at the positions which are about 500mm away from the upper flanges of the radiant tubes,
s5, after the gravity center of the radiant tube enters the platform, replacing a crane hook with a chain block of 2 tons on an outer structural beam at the lower part of an upper platform in the S1, matching 2 blocks to pull the radiant tube to the edge of the furnace mouth,
s6, arranging a hoist on the upper radiant tube in the furnace (the upper radiant tube can be arranged at the top opening of the furnace when being replaced), and pulling the radiant tube into the furnace;
s7, ensuring the distance between the head of the radiant tube and the furnace wall diagonal brace to be more than 64mm when in installation,
s8, placing a heat insulation sealing strip at the interface between the inner part of the outer frame of the radiant tube and the furnace door when the radiant tube is inserted;
and S9, spot welding the four corners of the outer frame and the furnace mouth after the radiant tube is in place, and separating the radiant tube from the gourd after temporary fixation.
2. The on-line rapid replacement method for W-shaped radiant tube of continuous annealing furnace according to claim 1, characterized in that S1 extraction of radiant tube is as follows: 2 sets of 2-ton chain blocks (called as blocks below) are respectively arranged at corresponding positions outside the furnace where the radiant tubes need to be replaced, one is arranged on a structural beam at the lower part of the upper-layer platform close to the outside, and the other is arranged on a structural beam at the upper part of the lower-layer platform close to the outside; the other end is respectively fastened on the upper flange and the lower flange of the radiant tube by a phi 20 steel wire rope, and the radiant tube is directly pulled out of the furnace mouth by utilizing the matching of 2 hoists.
3. The method for rapidly replacing W-shaped radiant tubes of a continuous annealing furnace on line according to claim 2, wherein S2, a 1-ton chain block is fixed on a steel structure at the inner side of the upper platform to hang the upper tube body of the radiant tube, the 1-ton chain block is used to hang the upper tube body of the radiant tube when the radiant tube is pulled out of the furnace mouth by about 600mm, the radiant tube is pulled to the edge of the furnace platform by matching with a travelling crane, and 5 parallel radiant tubes are pulled out to the edge of the platform by the same method.
4. The method for rapidly replacing W-shaped radiant tubes of a continuous annealing furnace on line according to claim 3, characterized in that S4, 5 new radiant tubes are hoisted in the same way, the hoisting point is located at a distance of about 500mm from the upper flange of the radiant tube, here the center of gravity of the radiant tube, when the hoist is lifted to the side of the platform of the furnace, the radiant tubes are pulled to the platform by using a 1-ton hoist on the steel structure at the inner side of the upper platform in S2, and 5 radiant tubes are pulled to the position by using 5 hoists at the same time.
5. The continuous annealing furnace W-type radiant tube online rapid replacement method according to claim 3 or 4, characterized in that the sealing strip is arranged in a ring shape in step S8.
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| CN107364785A (en) * | 2016-05-11 | 2017-11-21 | 五冶集团上海有限公司 | A kind of radiant tube suspender and its making and use method |
| CN106086263A (en) * | 2016-08-04 | 2016-11-09 | 河北钢铁股份有限公司承德分公司 | A kind of collaborative hanging method of blast furnace cooling stave |
| DE202017105342U1 (en) * | 2017-09-05 | 2017-09-21 | Feng Shenglin | In series connected electric hoist for single carrier |
| CN109837368A (en) * | 2017-11-29 | 2019-06-04 | 中冶宝钢技术服务有限公司 | Device and method is used in a kind of replacement of radiant tube |
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