CN110814559A - Method for processing forced circulation cooling flue of converter - Google Patents
Method for processing forced circulation cooling flue of converter Download PDFInfo
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- CN110814559A CN110814559A CN201910942196.9A CN201910942196A CN110814559A CN 110814559 A CN110814559 A CN 110814559A CN 201910942196 A CN201910942196 A CN 201910942196A CN 110814559 A CN110814559 A CN 110814559A
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- Prior art keywords
- welding
- cooling
- processing
- forced circulation
- flue
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention relates to the field of smoke exhaust devices of steel making furnaces, in particular to a method for processing a converter forced circulation cooling flue, which can improve welding precision and reduce the influence of foreign matters on the cooling flue. A method for processing a converter forced circulation cooling flue comprises the steps of transportation, piping, welding, inspection and the like. Through the management and control of foreign matters such as welding slag in transportation protection, piping and the welding process, effectively reduce the probability that the orifice was blockked up to the foreign matter, can also carry out the block and the collection of foreign matter through the cartridge filter.
Description
Technical Field
The invention relates to the field of smoke exhaust devices of steel making furnaces, in particular to a method for processing a converter forced circulation cooling flue.
Background
The converter vaporization cooling flue is one of main corollary equipments for converter steelmaking, and its main function is to recover coal gas, steam and smoke dust, and simultaneously participate in the interlocking of converter production process.
The converter vaporization cooling flue is divided into natural cooling and forced circulation cooling, and the difference is that the forced circulation cooling flue is positioned in a lower header group of a flue at a furnace mouth section and is provided with an orifice which is used for distributing water quantity of each calandria of the flue and ensuring that each calandria has good water circulation, the diameter of the orifice is smaller, usually 8mm, and the diameter of each calandria of the flue is 38 mm.
For the forced circulation cooling flue, the welding of the pipe is the core point of the quality of the flue replacement, the quality of the welding of the pipe directly determines the success or failure of the flue replacement, if foreign matters such as welding slag, welding rods and gas cutting burrs enter the pipeline during the pipe arrangement period of the forced circulation cooling flue, when the foreign matters flow to the throttling hole of the lower header group of the flue at the furnace mouth section along with the cooling circulation, the throttling hole is blocked because the aperture of the throttling hole is very small and is far smaller than the pipe diameter of the flue pipe bank, the foreign matters can block the throttling hole, the flue pipe bank where the blocking throttling hole is positioned is lack of water and is burnt, and the flue pipe bank is whitish.
The first way of dealing with the accident is to take out and seal the foreign matters blocking the throttling hole through the opening of the header under the furnace mouth section, and the second way of replacing the flue calandria of the burst pipe is long in treatment time and high in treatment difficulty, and is not easy to eradicate.
Because the welding slag, the gas cutting burrs and the like have adhesiveness and cannot fall off together when being adhered to the inner wall of the flue cooling water pipe, unscheduled multiple flue pipe explosion accidents can occur along with the falling of the welding slag and the gas cutting burrs, and serious production, equipment and potential safety hazards are caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for processing a converter forced circulation cooling flue, which can improve the welding precision and reduce the influence of foreign matters on the cooling flue.
The scheme provided by the invention is as follows:
a method for processing a converter forced circulation cooling flue comprises the following steps:
step S10: transporting the installed cooling pipeline to a processing site;
step S20: welding positioning parts on the inner wall of a vertical pipe of the cooling pipeline, wherein the positioning parts are distributed on the inner wall in an annular manner;
step S30: a filter cartridge is arranged in the vertical pipe, and the filter cartridge is arranged at the position of the positioning part;
step S40: piping, assembling the cooling pipelines;
step S50: welding, namely bottoming the welding position of the cooling pipeline by using argon arc welding, and then manually welding a cover surface;
step S60: and (5) carrying out tightness inspection on the cooling pipeline, and carrying out repair welding on the unsealed part.
In the traditional cooling pipeline processing method, manual welding is directly adopted, welding slag easily enters a flue cooling pipeline in the welding process, and the condition that the throttling hole is blocked by the welding slag can be caused. And the argon arc welding is used for priming, and the manual welding mode can reduce the generation of welding slag. The filter cartridge can block welding slag generated during machining from blocking the orifice.
Preferably, in step S10, the cooling pipe is sealed by a plate with a diameter larger than the diameter of the pipe opening during transportation, and the cooling pipe and the plate are connected by spot welding. If the protection is not carried out in the transportation process, foreign matters fall into a cooling pipeline in the transportation process, so that the throttling hole is blocked.
Preferably, the cooling pipeline is transported to a processing site, and then the plate is removed and welding points are trimmed in a polishing mode. The welding spots are polished by the angle grinder, so that the generation of welding slag can be reduced, and the pipe orifice is ensured to be smooth.
Preferably, in step S30, a filter screen is disposed on both the circumferential surface of the filter cartridge and the end close to the throttle orifice, and an outwardly extending flange is disposed on the end far from the throttle orifice. The flange is used for matching with the positioning part to realize the fixation of the filter cartridge.
Preferably, in step S40, when the cooling pipe is not suitable for piping, the cooling pipe is taken out and trimmed off-line, and the foreign matter on the inner wall is cleaned and then assembled on-line. The direct online operation of starting a fire, cutting tumor can adhere in flue condenser tube inner wall, and along with the environmental factor change of temperature, pressure, flow, vibration, cutting tumor will drop, blocks up the orifice and causes the accident.
Preferably, in step S50, after the welding between the cooling pipes is completed, the reinforcement welding is performed by using a reinforcement member, and both sides of the reinforcement member are welded to different pipes respectively. The reinforcing member can improve the connection strength of the welding portion.
Preferably, in step S50, the welding process of the cooling pipe is performed in a state of being forcibly butted without using an external force. The use of external force for butt joint can generate additional stress, and the strength and the service life of the joint are influenced.
Preferably, in step S60, after the welding is completed, water is supplied into the cooling pipe, a leak point is identified and marked, and after the water is drained, the first repair welding is performed until no leak point exists. The position of the weld imperfection can be directly found after the water is sent.
Preferably, after the first repair welding, pressurized water feeding circulation is carried out, a leakage point is confirmed and marked, and after drainage, second repair welding is carried out until no leakage point exists. After the water is pressurized and fed, the welding defects which cannot be found under normal pressure can be found. If the water feeding is not performed in sequence with the normal-pressure water feeding, the defects existing under the normal pressure can be further damaged by larger water pressure, and the difficulty of repair welding is influenced.
Preferably, after the repair welding is completed, the angle grinder is used for cutting the vertical pipe filter cartridge of the flue at the furnace mouth section, the filter cartridge is taken out, and the vertical pipe is only installed back after the condition of foreign matters in the filter cartridge is recorded. Foreign matters in the pipeline are collected by the filter cartridge, and the filter cartridge can be directly taken out and is not put back.
The invention has the following beneficial effects:
1. the pipe orifice is protected in the transportation process, so that the influence of foreign matters entering the pipe orifice on welding is prevented;
2. the cutting beading and welding slag can be prevented in the piping process, and the probability of blocking the throttling hole by foreign matters is reduced;
3. the welding process adopts a mode of argon arc welding and manual welding, so that the generation of welding slag is reduced;
4. the disassembly and inspection process can not only inspect the sealing performance of the welding part, but also remove foreign matters generated.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic view of a cooling channel configuration;
FIG. 2 is an enlarged schematic view at A in FIG. 1;
in the figure, 1-smoke tube, 2-lower header, 3-vertical tube, 4-positioning part, 5-filter cartridge, 6-flange, 7-reinforcing member.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides a method for processing a converter forced circulation cooling flue,
the method comprises the following steps:
step S10: the installed cooling pipeline is transported to a processing site, the cooling pipeline is plugged by a plate with the diameter larger than the diameter of the pipe orifice in the transportation process, the cooling pipeline is connected with the plate through spot welding, and the plate is removed and welding points are trimmed through a polishing mode after the cooling pipeline is transported to the processing site.
Step S20: welding positioning parts on the inner wall of a vertical pipe of the cooling pipeline, wherein the positioning parts are annularly distributed on the inner wall;
step S30: install the cartridge filter in the riser, the cartridge filter setting is in location portion position.
As shown in fig. 1 and 2, the filter cartridge 5 is installed in a manner that a cooling water channel is provided at a joint of the flue 1, and the cooling water channel includes the lower header 2 and the stand pipe 3. The location portion 4 is the ring of welding in the riser 3 inboard, and the periphery and the lower extreme of cartridge filter 5 all are equipped with the filter screen, and the upper end opening is equipped with outside flange 6 that extends, and cartridge filter 5 is fixed with flange 6 through location portion 4.
Step S40: and (2) piping, assembling and assembling the cooling pipeline, taking out the cooling pipeline from the flue cooling water pipe to perform online trimming when the cooling pipeline is not suitable in the piping process, cleaning foreign matters on the inner wall, and then performing online assembly, wherein online firing operation cannot be directly performed.
Step S50: and (3) welding, namely backing the welding position of the cooling pipelines by using argon arc welding, then manually welding the cover surfaces, and reinforcing and welding by using a reinforcing component after the welding between the cooling pipelines is finished. The welding of the cooling pipe and the pipe must be carried out in a natural state, and the pipe cannot be butted by external force due to the fact that the pipe is not in place, so that additional stress is prevented.
As shown in fig. 1, the reinforcing member 7 has a C-shaped cross section, and both sides of the reinforcing member 7 are welded to different pipes, respectively.
Step S60: and (4) disassembling and inspecting the filter cartridge, feeding water after the welding of the flue is confirmed, confirming a leakage point and marking, draining and repairing and welding until no leakage point exists, pressurizing to 1.8MPa after 2 hours of non-pressing circulation and circulating for 12 hours, wherein the same draining and repairing and welding of the leakage point occurs in the period.
And (3) draining water after the cooling pipeline is pressed and circulated for 12 hours, cutting the marked positions of filter cartridges of 4 vertical pipes of a lower header group of a flue at the furnace mouth section by using an angle grinder, taking out the filter cartridges, recording the condition of foreign matters in the filter cartridges, reinstalling the vertical pipes (the filter cartridges are not installed any more), and installing the vertical pipes to follow the requirements of flue piping and welding.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A processing method of a converter forced circulation cooling flue is characterized in that: the method comprises the following steps:
step S10: transporting the installed cooling pipeline to a processing site;
step S20: welding positioning parts on the inner wall of a vertical pipe of the cooling pipeline, wherein the positioning parts are distributed on the inner wall in an annular manner;
step S30: a filter cartridge is arranged in the vertical pipe, and the filter cartridge is arranged at the position of the positioning part;
step S40: piping, assembling the cooling pipelines;
step S50: welding, namely bottoming the welding position of the cooling pipeline by using argon arc welding, and then manually welding a cover surface;
step S60: and (5) carrying out tightness inspection on the cooling pipeline, and carrying out repair welding on the unsealed part.
2. The method for processing the forced circulation cooling flue of the converter according to claim 1, wherein the method comprises the following steps: in the step S10, the cooling pipeline is plugged by using a plate with a diameter larger than that of the pipe orifice in the transportation process, and the cooling pipeline is connected with the plate through spot welding.
3. The method for processing the forced circulation cooling flue of the converter according to claim 2, characterized in that: and the cooling pipeline is transported to a processing site, and then the plate is removed and welding spots are trimmed in a polishing mode.
4. The method for processing the forced circulation cooling flue of the converter according to claim 1, wherein the method comprises the following steps: in step S30, a filter screen is disposed on both the circumferential surface of the filter cartridge and the end close to the throttle orifice, and an outwardly extending flange is disposed on the end far from the throttle orifice.
5. The method for processing the forced circulation cooling flue of the converter according to claim 1, wherein the method comprises the following steps: in step S40, when the cooling pipe is not suitable in the piping process, the cooling pipe is taken out and trimmed off-line, and the foreign matter on the inner wall is cleaned and assembled on-line.
6. The method for processing the forced circulation cooling flue of the converter according to claim 1, wherein the method comprises the following steps: in step S50, after the welding between the cooling pipes is completed, reinforcement welding is performed using a reinforcement member, and both sides of the reinforcement member are welded to different pipes, respectively.
7. The method for processing the forced circulation cooling flue of the converter according to claim 1, wherein the method comprises the following steps: in step S50, the welding process of the cooling pipe is performed in a state of being forcibly butted without using an external force.
8. The method for processing the forced circulation cooling flue of the converter according to claim 1, wherein the method comprises the following steps: in step S60, after welding, water is supplied to the cooling pipe, a leak point is identified and marked, and after draining, first repair welding is performed until no leak point exists.
9. The method for processing the forced circulation cooling flue of the converter according to claim 8, wherein the method comprises the following steps: and (4) pressurizing and water feeding circulation is carried out after the first repair welding, a leakage point is confirmed and marked, and the second repair welding is carried out after water drainage until no leakage point exists.
10. The method for processing the forced circulation cooling flue of the converter according to claim 9, wherein the method comprises the following steps: and after the repair welding is completed, cutting the vertical pipe filter cartridge of the flue at the furnace mouth section by using an angle grinder, taking out the filter cartridge, and only installing the vertical pipe back after recording the condition of foreign matters in the filter cartridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910942196.9A CN110814559A (en) | 2019-09-30 | 2019-09-30 | Method for processing forced circulation cooling flue of converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910942196.9A CN110814559A (en) | 2019-09-30 | 2019-09-30 | Method for processing forced circulation cooling flue of converter |
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| CN110814559A true CN110814559A (en) | 2020-02-21 |
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| CN201910942196.9A Withdrawn CN110814559A (en) | 2019-09-30 | 2019-09-30 | Method for processing forced circulation cooling flue of converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112280928A (en) * | 2020-10-12 | 2021-01-29 | 首钢京唐钢铁联合有限责任公司 | Purification method before starting converter vaporization cooling system pipeline |
| CN115319417A (en) * | 2022-08-20 | 2022-11-11 | 欧萨斯能源环境设备(南京)有限公司 | Manufacturing process of converter water-cooling flue |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112280928A (en) * | 2020-10-12 | 2021-01-29 | 首钢京唐钢铁联合有限责任公司 | Purification method before starting converter vaporization cooling system pipeline |
| CN112280928B (en) * | 2020-10-12 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Purification method before starting converter vaporization cooling system pipeline |
| CN115319417A (en) * | 2022-08-20 | 2022-11-11 | 欧萨斯能源环境设备(南京)有限公司 | Manufacturing process of converter water-cooling flue |
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Application publication date: 20200221 |