CN112831645A - Heat treatment method after welding of blast furnace five-way ball - Google Patents
Heat treatment method after welding of blast furnace five-way ball Download PDFInfo
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- CN112831645A CN112831645A CN202011587207.5A CN202011587207A CN112831645A CN 112831645 A CN112831645 A CN 112831645A CN 202011587207 A CN202011587207 A CN 202011587207A CN 112831645 A CN112831645 A CN 112831645A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000003466 welding Methods 0.000 title claims abstract description 20
- 239000000295 fuel oil Substances 0.000 claims abstract description 12
- 239000000446 fuel Substances 0.000 claims abstract description 10
- 238000004321 preservation Methods 0.000 claims abstract description 7
- 239000000779 smoke Substances 0.000 claims abstract description 6
- 230000001174 ascending effect Effects 0.000 claims abstract description 5
- 239000002283 diesel fuel Substances 0.000 claims abstract description 5
- 238000007669 thermal treatment Methods 0.000 claims abstract description 5
- 239000012774 insulation material Substances 0.000 claims abstract description 4
- 230000000191 radiation effect Effects 0.000 claims abstract description 4
- 239000002360 explosive Substances 0.000 claims description 4
- 230000008719 thickening Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 230000035882 stress Effects 0.000 description 9
- 238000007689 inspection Methods 0.000 description 8
- 230000032683 aging Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- DBUTVDSHVUGWOZ-UHFFFAOYSA-N [Si].[Ni].[Cr].[Ni] Chemical compound [Si].[Ni].[Cr].[Ni] DBUTVDSHVUGWOZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- 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
- C21D1/30—Stress-relieving
-
- 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
- C21D1/34—Methods of heating
- C21D1/52—Methods of heating with flames
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/06—Extraction of hydrogen
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a heat treatment method after welding of a blast furnace five-way ball, which consists of a fuel oil system, an oil supply system, a measurement system, a column leg moving system and a smoke exhaust system; two holes with the size not smaller than phi 500 are formed in the spherical shell before heat treatment, and the positions of the ascending pipe and the descending pipe are respectively selected to be used as an air inlet and an exhaust port of a burner nozzle according to a pattern; adopting a fuel oil method for internal heating for heat treatment: the inside furnace that is used as of spherical tank chooses 0 diesel oil as fuel, and the spherical tank is outside to carry out adiabatic heat preservation with insulation material, spouts fuel oil into and atomizes through air-blower air supply and nozzle, is lighted by electronic ignition ware, and the high temperature air current that produces along with the continuous burning of fuel makes the spherical tank heat up to the required temperature of thermal treatment at spherical tank inner wall convection current conduction and flame heat radiation effect. The invention adopts the modes of multipoint heating and multipoint temperature control, and has the characteristics of less energy consumption, time period, obvious effect and the like.
Description
Technical Field
The invention relates to the field of installation of blast furnace steel structures, in particular to a heat treatment method after welding of a blast furnace five-way ball.
Background
A plurality of steel ball tanks are involved in an iron making system in the modern metallurgical industry, but a few methods for eliminating residual stress after the steel ball tanks are welded are available. The purpose of heat treatment after the welding of the steel ball tank is to eliminate the residual stress after the welding of the steel ball tank and ensure safe use, an important technological means is provided, and the method is also the last procedure after the manufacturing of the steel ball tank. The principle of heat treatment and residual stress elimination after the steel ball tank is welded is emphatically described, and the method for eliminating the residual stress after the steel ball tank is welded is described by taking a Shandong 5100m3 blast furnace five-way ball as an example.
The traditional post-welding heat treatment residual stress eliminating process for the heat treatment steel structure comprises the following steps: thermal aging, vibration aging, natural aging, static overload aging, thermal shock aging and the like. Wherein, the natural aging treatment (long time and incomplete stress relief); vibration aging (high efficiency, low cost, but can only eliminate about 70% of welding stress); manual heating aging (short time, high cost, 100% removal of welding stress and hydrogen removal).
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a heat treatment method after the five-way ball welding of a blast furnace, which solves the problem of eliminating the residual stress of a welding line.
In order to solve the technical problem, the invention is realized as follows:
a heat treatment method after welding of a blast furnace five-way ball is characterized by comprising the following steps:
firstly, placing three test plates at intervals of 120 degrees on a temperature zone to try to synchronize, arranging a temperature measuring point on each test plate, and thickening a heat insulating layer at the position to ensure that the temperature of each test plate is the same as that of the spherical shell plate;
secondly, two holes with the size not smaller than phi 500 are formed in the spherical shell before heat treatment, and the opening positions of the ascending pipe and the descending pipe are selected, wherein one position is used as an air inlet and an exhaust port of a burner nozzle;
one opening is required to be placed at a position lower than the ground so as to be convenient for placing heat treatment equipment during heat treatment, and the other opening is used as a smoke outlet and is placed at a position far away from inflammable and explosive articles;
finally, adopting a fuel oil method for internal heating for heat treatment: the inside furnace that is used as of spherical tank chooses 0 diesel oil as fuel, and the spherical tank is outside to carry out adiabatic heat preservation with insulation material, spouts fuel oil into and atomizes through air-blower air supply and nozzle, is lighted by electronic ignition ware, and the high temperature air current that produces along with the continuous burning of fuel makes the spherical tank heat up to the required temperature of thermal treatment at spherical tank inner wall convection current conduction and flame heat radiation effect.
The invention has the beneficial effects that: the method adopts a multipoint heating and multipoint temperature control mode, and the temperature is controlled and heated by a thermocouple automatic instrument, so that the temperature of each part in the spherical tank is uniformly controlled at the annealing temperature, the annealing of the spherical tank is ensured, meanwhile, hydrogen atoms permeating into a welding line in the welding process can be removed, and the hydrogen brittleness of a welding part is eliminated. The process has the characteristics of low energy consumption, time period, obvious effect and the like.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a graph of a thermal treatment process.
FIG. 2 is a first layout diagram of temperature measuring points.
Fig. 3 is a second temperature measuring point layout diagram.
Fig. 4 is a schematic view of a spherical tank.
Detailed Description
A heat treatment method after welding of a blast furnace five-way ball comprises the following steps:
firstly, placing three test plates at intervals of 120 degrees on a temperature zone to try to synchronize, arranging a temperature measuring point on each test plate, and thickening a heat insulating layer at the position to ensure that the temperature of each test plate is the same as that of the spherical shell plate;
secondly, two holes with the size not smaller than phi 500 are formed in the spherical shell before heat treatment, and the opening positions of the ascending pipe and the descending pipe are selected, wherein one position is used as an air inlet and an exhaust port of a burner nozzle;
one opening is required to be placed at a position lower than the ground so as to be convenient for placing heat treatment equipment during heat treatment, and the other opening is used as a smoke outlet and is placed at a position far away from inflammable and explosive articles;
finally, adopting a fuel oil method for internal heating for heat treatment: the inside furnace that is used as of spherical tank chooses 0 diesel oil as fuel, and the spherical tank is outside to carry out adiabatic heat preservation with insulation material, spouts fuel oil into and atomizes through air-blower air supply and nozzle, is lighted by electronic ignition ware, and the high temperature air current that produces along with the continuous burning of fuel makes the spherical tank heat up to the required temperature of thermal treatment at spherical tank inner wall convection current conduction and flame heat radiation effect.
And (3) specification of a heat treatment process:
selecting the following heat treatment process parameters (shown in a table I) and process curves (shown in a figure 1) according to the requirements of GB50094-2010 spherical storage tank construction and acceptance specifications:
table one: heat treatment process parameter table
| Item | Rate of temperature rise | Constant temperature | Constant temperature time | Speed of temperature reduction | Maximum temperature difference during heating and cooling | Maximum temperature difference at constant temperature |
| 50-80℃/h | 625±25 | 1.92h | 30-50℃/h | ≤130℃ | ≤50℃ |
The method comprises the following specific steps:
1. heat treatment process system
The heat treatment project consists of fuel oil supply, measurement, column leg movement and smoke exhaust systems.
A: fuel system
The fuel oil system adopts Italian P450T/G type light oil burner, the burner is connected with the manhole under the spherical tank, a set of intelligent inspection system is adopted to intelligently control the heat treatment engineering to meet the process requirements, the fuel adopts No. 0 diesel oil, the oil is pumped by the oil and enters the nozzle to be sprayed out under the control of the electromagnetic valve, the air blower of the burner supplies air from the bottom to assist combustion, the oil is atomized to burn, and the automatic electronic igniter ignites the fuel oil to burn.
B: oil supply system
The oil supply system consists of an oil tank, a first-stage filter, a first-stage oil pump, an oil delivery pipe, a second-stage filter, a flowmeter, a high-pressure oil pump, an oil return system and the like.
C: temperature measurement control system
The temperature measuring and monitoring system is used for intelligently measuring and controlling the temperature by a thermocouple, a compensation lead and a set of DR30 intelligent patrol instrument.
C-1 measurement point arrangement
According to the requirements of related technical standards of GB50094-2010 spherical storage tank construction and acceptance standard, 12 temperature measuring points are set in the heat treatment, the temperature measuring points are uniformly distributed on the surface of the spherical shell, the distance between every two adjacent temperature measuring points is less than or equal to 4500mm, the distance between the adjacent temperature measuring points is less than or equal to 200mm from the edge of a manhole and a spherical shell circumferential seam, and the temperature measuring points are required to be set on a product test panel. See the temperature measuring point layout chart (fig. 2 and 3) in detail; fig. 3 is an expanded view, unit: millimeter; wherein A: an equatorial band plate; f: an upper pole band plate; g: a lower pole band plate; □ is a product test board; ● is the temperature measuring point.
C-2 thermocouple installation
And fixing the thermocouple on the outer surface of the spherical shell by using bolts according to the requirements of the second drawing, and separately arranging the thermocouple on the flue gas and the test plate. The compensating conductor should be fixed properly to prevent burning. The types of the thermocouples are K-type nickel chromium-nickel silicon, and the compensation lead adopts a K-type double-core wire.
C-3 temperature monitoring
The temperature monitoring is provided with two sets of systems, one set is an EH100-24 long-chart automatic balance recorder which can record 24 temperature measuring points, the other set is a DR30 type intelligent patrol instrument temperature monitoring system which can cyclically detect the temperature of each temperature measuring point and simultaneously print 1 part of temperature report of each point every 30 minutes according to the process.
2. Heat preservation method
The spherical tank heat-insulating material adopts an aluminum silicate needled blanket with the thickness of 50mm, and is fixed by a steel bar with the diameter of 6mm, a nut of M12 and a No. 14 fine iron wire. The process is carried out from bottom to top, the joints of the inner layer and the outer layer are required to be staggered, the two adjacent heat-insulating layers at the top and the bottom are required to be overlapped by at least 200mm, the two heat-insulating layers at the left and the right are required to be overlapped by at least 50mm, and the joints are required to be tight. In order to prevent the installed heat-insulating cotton blocks from collapsing and falling off, the heat-insulating cotton blocks are tensioned outside according to the radial direction and the latitudinal direction of the spherical tank by using a 12# iron wire and a wire stretcher. The inlet holes and the connecting pipes on the spherical tank are added with heat insulation cotton, and the heat insulation is needed for the support column within the length range of 1m downwards from the lower end of the connecting welding line of the support column and the spherical tank. The heat preservation effect is monitored by the speed of the intelligent inspection instrument for inspecting one point every 3 seconds and one time every half minute, and the temperature difference signal alarm can be timely found out when the heat preservation defect occurs, so that the prompt is given for remediation. (FIG. 4)
3. Synchronous heat treatment of product test plate and spherical shell plate
The test plate and the spherical shell plate of the spherical tank are required to be subjected to heat treatment by the same process in the heat treatment specification. Therefore, three test plates are placed at intervals of 120 degrees on the temperature zone to achieve synchronization, temperature measuring points are arranged on the test plates, and the heat insulation layer at the position is thickened to ensure that the temperature of the test plates is the same as that of the spherical shell plate.
4. Preparation before heat treatment
4.1, welding the ball, the manhole, the connecting pipe, the pre-welded part and the like completely, and passing the appearance inspection and the nondestructive inspection.
4.2, performing heat treatment after the nondestructive inspection work is finished and qualified. Other work such as painting, water pressure needs to be done after the heat treatment is completed.
4.3, the quality and the geometric dimension of the inner surface and the outer surface of the spherical tank are qualified by inspection, and the records are complete.
4.4, the welding inspection of the product test plate is qualified, and the test plate is firmly fixed on the spherical shell after being confirmed by monitoring personnel.
4.5, all the original data are complete and are signed and approved by the quality assurance responsibility personnel and confirmed by the monitoring and inspection unit and the first party.
4.6, the heat treatment system devices are required to be completely installed, and all the systems are required to be debugged.
4.7, the power supply system is qualified and meets the requirements after being fully checked, and is in contact with related departments to ensure that the power is not cut off during the heat treatment.
4.8, the weather data should be mastered, and the heat treatment should avoid the strong wind and rainy weather.
4.9, all the staff in each post are complete and are trained to go on post and work separately.
4.10, the construction technical scheme needs to meet the bottom of related personnel.
4.11, opening two holes with the size not less than 500mm in the spherical shell before heat treatment, and selecting the opening positions at the ascending pipe position and the descending pipe position according to patterns, wherein one position at each position is used as an air inlet and an exhaust port of a burner nozzle. One opening is required to be placed at a lower position from the ground so as to facilitate the placement of heat treatment equipment during heat treatment. The other part is used as a smoke outlet and is arranged at a position far away from the inflammable and explosive articles.
Claims (1)
1. A heat treatment method after welding of a blast furnace five-way ball is characterized by comprising the following steps:
firstly, placing three test plates at intervals of 120 degrees on a temperature zone to try to synchronize, arranging a temperature measuring point on each test plate, and thickening a heat insulating layer at the position to ensure that the temperature of each test plate is the same as that of the spherical shell plate;
secondly, two holes with the size not smaller than phi 500 are formed in the spherical shell before heat treatment, and the opening positions of the ascending pipe and the descending pipe are selected, wherein one position is used as an air inlet and an exhaust port of a burner nozzle;
one opening is required to be placed at a position lower than the ground so as to be convenient for placing heat treatment equipment during heat treatment, and the other opening is used as a smoke outlet and is placed at a position far away from inflammable and explosive articles;
finally, adopting a fuel oil method for internal heating for heat treatment: the inside furnace that is used as of spherical tank chooses 0 diesel oil as fuel, and the spherical tank is outside to carry out adiabatic heat preservation with insulation material, spouts fuel oil into and atomizes through air-blower air supply and nozzle, is lighted by electronic ignition ware, and the high temperature air current that produces along with the continuous burning of fuel makes the spherical tank heat up to the required temperature of thermal treatment at spherical tank inner wall convection current conduction and flame heat radiation effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011587207.5A CN112831645A (en) | 2020-12-29 | 2020-12-29 | Heat treatment method after welding of blast furnace five-way ball |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011587207.5A CN112831645A (en) | 2020-12-29 | 2020-12-29 | Heat treatment method after welding of blast furnace five-way ball |
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| Publication Number | Publication Date |
|---|---|
| CN112831645A true CN112831645A (en) | 2021-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011587207.5A Pending CN112831645A (en) | 2020-12-29 | 2020-12-29 | Heat treatment method after welding of blast furnace five-way ball |
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| Country | Link |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4070147A (en) * | 1976-04-01 | 1978-01-24 | Chicago Bridge & Iron Company | Method and apparatus for post-weld heat treating a tank |
| CN1080662A (en) * | 1992-06-25 | 1994-01-12 | 中国化学工程总公司第九建设公司 | The multi-nozzle fuel oil heat treatment method of 2000 cubic metres of-5000 cubic metres of spherical tanks |
| CN110512066A (en) * | 2019-09-18 | 2019-11-29 | 大连金鼎石油化工机器有限公司 | A kind of spherical tank heat-treatment technology method |
-
2020
- 2020-12-29 CN CN202011587207.5A patent/CN112831645A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4070147A (en) * | 1976-04-01 | 1978-01-24 | Chicago Bridge & Iron Company | Method and apparatus for post-weld heat treating a tank |
| CN1080662A (en) * | 1992-06-25 | 1994-01-12 | 中国化学工程总公司第九建设公司 | The multi-nozzle fuel oil heat treatment method of 2000 cubic metres of-5000 cubic metres of spherical tanks |
| CN110512066A (en) * | 2019-09-18 | 2019-11-29 | 大连金鼎石油化工机器有限公司 | A kind of spherical tank heat-treatment technology method |
Non-Patent Citations (1)
| Title |
|---|
| 王嘉麟等主编: "《球形储罐焊接工程技术》", 31 January 2000, 机械工业出版社 * |
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Application publication date: 20210525 |