CN113667791A - Heat preservation method for metallurgical converter - Google Patents
Heat preservation method for metallurgical converter Download PDFInfo
- Publication number
- CN113667791A CN113667791A CN202110966116.0A CN202110966116A CN113667791A CN 113667791 A CN113667791 A CN 113667791A CN 202110966116 A CN202110966116 A CN 202110966116A CN 113667791 A CN113667791 A CN 113667791A
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- China
- Prior art keywords
- converter
- steel
- metallurgical
- temperature
- making
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- 238000004321 preservation Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 86
- 239000010959 steel Substances 0.000 claims abstract description 86
- 239000002893 slag Substances 0.000 claims abstract description 55
- 238000009628 steelmaking Methods 0.000 claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 239000002918 waste heat Substances 0.000 claims abstract description 14
- 238000012423 maintenance Methods 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 description 7
- 239000007921 spray Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a heat preservation method, particularly discloses a heat preservation method for a metallurgical converter, and belongs to the technical field of maintenance processes of metallurgical production equipment. The heat preservation method for the metallurgical converter is convenient to operate, low in operation cost and capable of effectively prolonging the service life of the lining layer of the metallurgical converter. The heat preservation method adopts the waste heat of the steel slag discharged by the steel-making converter and the temperature of which is not lower than 600 ℃ to bake the metallurgical converter in the production stop state, so that the temperature of the metallurgical converter is always kept in the specified higher temperature range.
Description
Technical Field
The invention relates to a heat preservation method, in particular to a heat preservation method for a metallurgical converter, and belongs to the technical field of maintenance processes of metallurgical production equipment.
Background
The existing heat preservation method of the steel converter comprises the following steps:
the application number is 201720763528.3, the utility model provides a patent of "a converter heat preservation device", this utility model provides a converter heat preservation device, including deep floor, lug, converter, inlayer steel sheet, outer steel sheet, insulation material and side steel sheet, inlayer steel sheet welding is in the below of both ends side steel sheet, outer steel sheet welding is in the top of both ends side steel sheet, fill insulation material between outer steel sheet and the inlayer steel sheet, vertical welding deep floor on outer steel sheet, central point puts welding lug on outer steel sheet, when the converter stops blowing, hang the converter with the driving crane and cover the fire door, prevent the loss of temperature, improve converter life. The method has the defect that the cover plate is not easy to be hung above the furnace mouth by a crane due to a large amount of equipment above the converter, and the operation is inconvenient.
The application number is 201520572277.1, the utility model discloses a patent of "converter fire door heat preservation device", this utility model relates to a converter fire door heat preservation device, including heat preservation lid and heat preservation lid support to the circumferential inscribed circle of heat preservation lid internal surface is the reference circle, and the radius of reference circle is not less than the radius of converter fire door, and the heat preservation lid is vertical to be fixed on heat preservation lid support, is equipped with on the heat preservation lid support to be used for the overhead traveling crane to lift by crane the lug in order to adjust its position. The heat preservation cover of the heat preservation device can cover the converter mouth to seal and preserve heat of the converter mouth, thereby effectively reducing the heat loss of the converter mouth, delaying the cooling speed of the hearth of the converter, avoiding the damage of the furnace lining after the production recovery due to rapid cooling and rapid heating, and prolonging the service life of the furnace lining of the converter. The heat preservation device has the advantages of simple structure, energy conservation, environmental protection, reduction or even cancellation of fuel consumption, reduction of production cost and avoidance of environmental pollution. The method also has the defects of inconvenient hoisting of the heat preservation cover and high operation difficulty.
The invention relates to a converter horizontal baking heat preservation device, which is a patent with the application number of CN201510568953.2 and the invention name of 'converter horizontal baking heat preservation device and a use method thereof', and comprises a baking trolley, wherein the baking trolley comprises a trolley platform and a travelling mechanism for driving the trolley platform to travel on a converter main operation platform, and a heat preservation cover is vertically fixed at one end of the trolley platform; a combustion gun horizontally penetrates through the heat-insulating cover and comprises a main gas spray pipe and a combustion-supporting gas spray pipe, the combustion-supporting gas spray pipe is sleeved outside the main gas spray pipe, and the outlet end of the combustion-supporting gas spray pipe is flush with the outlet end of the main gas spray pipe and is positioned on one side of the heat-insulating cover away from the trolley platform; when the converter is shaken for 90 degrees in front of the converter, the travelling mechanism drives the trolley platform to be close to the converter until the heat preservation cover covers the converter mouth of the converter. In addition, the application method of the baking and heat-preserving device is also related. The horizontal baking mode is adopted by the baking heat preservation device, heat preservation operation and heating operation synergistic effect can be flexibly selected according to the blowing-out time, and energy consumption can be effectively saved while the converter is heated and heat preserved. The method has the disadvantages of consumption of combustion-supporting gas, consumption of energy and carbon dioxide emission.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the heat preservation method for the metallurgical converter is convenient to operate, low in operation cost and capable of effectively prolonging the service life of the lining layer of the metallurgical converter.
The technical scheme adopted for solving the technical problems is as follows: the heat preservation method for the metallurgical converter adopts the waste heat of steel slag discharged by a steel converter and with the temperature not lower than 600 ℃ to bake the metallurgical converter in a production stop state, so that the temperature of the metallurgical converter is always kept in a specified higher temperature range.
Further, when the metallurgical converter is baked by using the waste heat of the steel slag, the steel converter is turned upside down so that the opening of the steel converter faces downward and the steel slag pot directly below the steel converter directly introduces the waste heat of the steel slag into the steel converter to realize baking of the steel converter.
In the preferable mode of the scheme, the weight of the steel slag in the steel slag tank is 25-30 tons.
Furthermore, the steel slag tank is immediately replaced after the temperature of the steel slag in the steel slag tank is reduced to 600 ℃ or below so as to keep the heat of the residual heat of the steel slag.
In a preferred embodiment of the above aspect, the steel converter to be roasted is a steel converter that continuously produces steel for at least more than 10 days or is connected to produce steel for more than 30 days and requires maintenance.
Further, the temperature of the steel converter at which the baking is started is the initial temperature at which the steel making is stopped.
In the preferable mode of the above-mentioned method, the initial temperature at which the steel-making is stopped is 1600 to 1700 ℃.
Further, the initial baking temperature of the steel slag is not lower than 800 ℃.
Further, the production stop time of the steel converter needing baking is more than 4 hours.
The invention has the beneficial effects that: the application provides a heat preservation method uses the waste heat of the steel slag that the temperature that steelmaking converter discharged is not less than 600 ℃ as the heat of toasting, effectively toasts the metallurgical converter that is in the off-stream state to the temperature of metallurgical converter keeps in the higher temperature range of regulation throughout during making toasts, reaches the purpose of avoiding being in the temperature rapid decline of the metallurgical converter of off-stream state, and then avoids the lining course of metallurgical converter to appear the fracture because of rapid cooling, the condition that drops even, reach the mesh of extension metallurgical converter lining course life.
Detailed Description
In order to solve the technical problems in the prior art, the invention provides the heat preservation method for the metallurgical converter, which is convenient to operate, low in operation cost and capable of effectively prolonging the service life of the lining layer of the metallurgical converter. The heat preservation method adopts the waste heat of the steel slag discharged by the steel-making converter and the temperature of which is not lower than 600 ℃ to bake the metallurgical converter in the production stop state, so that the temperature of the metallurgical converter is always kept in the specified higher temperature range. The application provides a heat preservation method uses the waste heat of the steel slag that the temperature that steelmaking converter discharged is not less than 600 ℃ as the heat of toasting, effectively toasts the metallurgical converter that is in the off-stream state to the temperature of metallurgical converter keeps in the higher temperature range of regulation throughout during making toasts, reaches the purpose of avoiding being in the temperature rapid decline of the metallurgical converter of off-stream state, and then avoids the lining course of metallurgical converter to appear the fracture because of rapid cooling, the condition that drops even, reach the mesh of extension metallurgical converter lining course life.
In the above embodiment, in order to enhance the baking effect and to make the best use of the residual heat of the steel slag, when the metallurgical converter is baked using the residual heat of the steel slag, the residual heat of the steel slag is directly introduced into the steel converter by reversing the steel converter so that the opening of the steel converter faces downward and the slag pot located directly below the converter is used to bake the steel converter. And the weight of the steel slag in the slag pot should be kept at least 25 tons, preferably 25 to 30 tons. And when the temperature of the steel slag in the steel slag tank is reduced to 600 ℃ or below, the steel slag tank is immediately replaced to keep the heat of the waste heat of the steel slag. In order to reduce the number of operations, the steel slags described in the present application generally have an initial baking temperature of not less than 800 ℃.
Accordingly, in order for the steel converter itself to start baking, the steel converter is set to the initial temperature at which steel making is stopped, that is, the initial temperature at which steel making is stopped is usually 1600 to 1700 ℃. The steel-making converter needing baking is a steel-making converter which continuously makes steel for more than 10 furnaces or continuously makes steel for more than 30 days and needs maintenance. The production stop time of the steel converter needing baking is more than 4 hours.
In summary, the heat preservation method provided by the application preserves the heat of the converter by shaking the converter to the inverted position and utilizing the waste heat of the steel slag in the slag pot, fully utilizes the waste heat resource of the slag pot, realizes energy conservation and environmental protection, slows down the falling speed of the temperature of the converter, keeps the temperature of the converter, and prolongs the service life of the converter.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention discloses a heat preservation method of a steelmaking converter, which comprises the following steps: the steel-making converter is continuously used for making steel, the steel-making converter is shaken to the position that a converter mouth is downward during the period of stopping production of steel making, a slag pot is placed under the converter, and the heat of slag in the slag pot is utilized to keep the temperature of the steel-making converter.
The steelmaking of the steelmaking converter is carried out, and the steelmaking end temperature is 1600-1700 ℃.
The number of continuous steelmaking furnaces is more than 10, the refractory materials of the steelmaking converter and the furnace wall keep higher temperature, the service life of the converter is favorably prolonged, the heat effect of the converter is high, and the required temperature raising materials are few.
During the fault period and the overhaul period of the steel-making converter, the production of the converter needs to be stopped, the production is generally stopped for more than 8 hours, the long production stopping time can cause the converter to be greatly cooled, and the service life of refractory materials of the converter is not favorable.
During the blowing out of the steel converter, the density of hot air is low, when the converter mouth is upward, the hot air can rise, so that the temperature loss of the converter is increased, the temperature drop speed is high, and the converter is shaken to the direction that the converter mouth is downward, so that the temperature loss of the converter can be reduced.
The converter can produce steel slag in the steel making process, and the converter can be baked under the condition of high temperature of the steel slag, so that the converter is maintained at a higher temperature.
After the temperature of the steel slag for baking the converter is reduced to 600 ℃, the baking capacity of the converter by the slag pot is reduced, and the converter can be continuously baked by replacing a new high-temperature slag pot.
Example one
A certain steel mill is provided with 3 120-ton steel-making converters, the steel-making production is carried out continuously for 30 days, and the steel-making end temperature is 1640-1670 ℃. And planning to overhaul for 12 hours, after the converter is stopped, swinging the converter to 180 degrees, enabling the converter mouth to face downwards and the converter bottom to face upwards, placing a steel slag tank filled with steel slag on a converter buggy ladle, enabling the weight of steel ladles in the slag tank to be 25-30 tons, driving the buggy ladle to be under the converter, baking the converter by using the high temperature of the steel slag, and after 4 hours, reducing the temperature of the steel slag, replacing the steel slag tank produced by other steel-making converters, placing the steel slag tank under the converter, and continuously baking the converter.
Claims (9)
1. A heat preservation method for a metallurgical converter is characterized by comprising the following steps: the heat preservation method adopts the waste heat of the steel slag discharged by the steel-making converter and the temperature of which is not lower than 600 ℃ to bake the metallurgical converter in the production stop state, so that the temperature of the metallurgical converter is always kept in the specified higher temperature range.
2. The holding method for a metallurgical converter according to claim 1, characterized in that: when the metallurgical converter is baked by using the waste heat of the steel slag, the waste heat of the steel slag is directly introduced into the steel-making converter by reversing the steel-making converter to enable a converter mouth to face downwards and directly face a steel slag pot positioned right below the steel-making converter, so that the steel-making converter is baked.
3. The holding method for a metallurgical converter according to claim 2, characterized in that: the weight of the steel slag in the steel slag tank is 25-30 tons.
4. A holding method for a metallurgical converter according to claim 2 or 3, characterized in that: and immediately replacing the steel slag tank after the temperature of the steel slag in the steel slag tank is reduced to 600 ℃ or below so as to keep the heat of the waste heat of the steel slag.
5. The holding method for a metallurgical converter according to claim 4, characterized in that: the steel-making converter needing baking is a steel-making converter which continuously makes steel for more than 10 furnaces or continuously makes steel for more than 30 days and needs maintenance.
6. The holding method for a metallurgical converter according to claim 5, characterized in that: the temperature of the steel converter at which the baking is started is the initial temperature at which the steel making is stopped.
7. The holding method for a metallurgical converter according to claim 6, characterized in that: the initial temperature when stopping steel making is 1600-1700 ℃.
8. The holding method for a metallurgical converter according to claim 1, characterized in that: the initial baking temperature of the steel slag is not lower than 800 ℃.
9. The holding method for a metallurgical converter according to claim 8, characterized in that: the production stop time of the steel converter needing baking is more than 4 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110966116.0A CN113667791A (en) | 2021-08-23 | 2021-08-23 | Heat preservation method for metallurgical converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110966116.0A CN113667791A (en) | 2021-08-23 | 2021-08-23 | Heat preservation method for metallurgical converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113667791A true CN113667791A (en) | 2021-11-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110966116.0A Pending CN113667791A (en) | 2021-08-23 | 2021-08-23 | Heat preservation method for metallurgical converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113667791A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115109886A (en) * | 2022-07-11 | 2022-09-27 | 广东韶钢松山股份有限公司 | Heat preservation method for long-time shutdown of converter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040040844A (en) * | 2002-11-08 | 2004-05-13 | 주식회사 포스코 | Method for charging slag forming reduction type heat insulation material in receive ladle |
| CN101733397A (en) * | 2009-12-30 | 2010-06-16 | 攀枝花钢城集团瑞钢工业有限公司 | Method for roasting basic lining of ladle |
| CN104588631A (en) * | 2015-01-19 | 2015-05-06 | 新疆八一钢铁股份有限公司 | Method of applying steel slag waste heat to bake new-built ladle |
| CN104673955A (en) * | 2015-03-05 | 2015-06-03 | 山东钢铁股份有限公司 | Shut-down heat preservation method for converter |
| CN107779543A (en) * | 2016-08-26 | 2018-03-09 | 鞍钢股份有限公司 | Device for preheating scrap steel and alloy by using waste heat of converter steel slag and using method |
| CN108642230A (en) * | 2018-06-01 | 2018-10-12 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of scrap steel preheating method, semi-steel making process and the method for improving steel scrap consumption using semisteel smelting |
-
2021
- 2021-08-23 CN CN202110966116.0A patent/CN113667791A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040040844A (en) * | 2002-11-08 | 2004-05-13 | 주식회사 포스코 | Method for charging slag forming reduction type heat insulation material in receive ladle |
| CN101733397A (en) * | 2009-12-30 | 2010-06-16 | 攀枝花钢城集团瑞钢工业有限公司 | Method for roasting basic lining of ladle |
| CN104588631A (en) * | 2015-01-19 | 2015-05-06 | 新疆八一钢铁股份有限公司 | Method of applying steel slag waste heat to bake new-built ladle |
| CN104673955A (en) * | 2015-03-05 | 2015-06-03 | 山东钢铁股份有限公司 | Shut-down heat preservation method for converter |
| CN107779543A (en) * | 2016-08-26 | 2018-03-09 | 鞍钢股份有限公司 | Device for preheating scrap steel and alloy by using waste heat of converter steel slag and using method |
| CN108642230A (en) * | 2018-06-01 | 2018-10-12 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of scrap steel preheating method, semi-steel making process and the method for improving steel scrap consumption using semisteel smelting |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115109886A (en) * | 2022-07-11 | 2022-09-27 | 广东韶钢松山股份有限公司 | Heat preservation method for long-time shutdown of converter |
| CN115109886B (en) * | 2022-07-11 | 2023-10-20 | 广东韶钢松山股份有限公司 | Heat preservation method for long-time shutdown of converter |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211119 |
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| RJ01 | Rejection of invention patent application after publication |