CN111313487A - Power transmission method for ladle refining furnace - Google Patents
Power transmission method for ladle refining furnace Download PDFInfo
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- CN111313487A CN111313487A CN202010213584.6A CN202010213584A CN111313487A CN 111313487 A CN111313487 A CN 111313487A CN 202010213584 A CN202010213584 A CN 202010213584A CN 111313487 A CN111313487 A CN 111313487A
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- Prior art keywords
- preset
- current
- refining furnace
- ladle refining
- power transmission
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- 238000007670 refining Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000005540 biological transmission Effects 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- 238000010891 electric arc Methods 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 6
- 125000004433 nitrogen atom Chemical group N* 0.000 abstract description 5
- 238000007493 shaping process Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002716 delivery method Methods 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J4/00—Circuit arrangements for mains or distribution networks not specified as ac or dc
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The embodiment of the invention provides a power transmission method for a ladle refining furnace, which comprises the following steps: adopting a first preset voltage to supply power to the ladle refining furnace, wherein the supplied current is a first preset current, and the power supply time is 1-2 minutes; under the condition that the electric arc is stable, adjusting the voltage to a second preset voltage on line, adjusting the current to a second preset current, and keeping the power transmission time to be 9-10 minutes; and adopting a third preset voltage to supply power to the ladle refining furnace, wherein the supplied current is a third preset current. The method overcomes the problems that in the prior art, in the control process of a ladle refining furnace and the process of heating molten steel by power transmission of an LF furnace, nitrogen molecules in air are ionized under the action of high-current electric arcs, N2 is N + N, a large amount of nitrogen atoms enter the molten steel, the performance of steel is influenced by excessively high N content, and the shaping and impact toughness of the steel are reduced.
Description
Technical Field
The invention relates to the technical field of ladle refining furnace control, in particular to a power transmission method of a ladle refining furnace.
Background
An LF FURNACE (LADLE FURNACE), namely a LADLE refining FURNACE, is a main external refining device in steel production. LF furnaces are generally referred to as refining furnaces in the steel industry, and are actually a special form of electric arc furnaces.
In the prior art, in the control process of a ladle refining furnace and the process of heating molten steel by power supply of an LF furnace, nitrogen molecules in air are ionized under the action of a high-current arc, N2 is (N ] + [ N ], a large number of nitrogen atoms enter the molten steel, and the excessively high N content affects the performance of steel products and reduces the shaping and impact toughness of the steel products.
Therefore, the invention provides a ladle refining furnace power transmission method which can effectively overcome the problems in the prior art in the using process.
Disclosure of Invention
In order to solve the technical problems, the invention aims to overcome the problems that in the prior art, in the control process of a ladle refining furnace and the process of heating molten steel by power transmission of an LF furnace, nitrogen molecules in air are ionized under the action of high-current electric arcs, N2 is N + N, a large amount of nitrogen atoms enter the molten steel, the performance of steel is influenced by excessively high N content, and the shaping and impact toughness of the steel are reduced, so that the power transmission method of the ladle refining furnace in the prior art can be effectively overcome in the using process.
In order to achieve the above object, an embodiment of the present invention provides a ladle refining furnace power transmission method, including:
adopting a first preset voltage to supply power to the ladle refining furnace, wherein the supplied current is a first preset current, and the power supply time is 1-2 minutes;
under the condition that the electric arc is stable, adjusting the voltage to a second preset voltage on line, adjusting the current to a second preset current, and keeping the power transmission time to be 9-10 minutes;
a third preset voltage is adopted to supply power to the ladle refining furnace, and the supplied current is a third preset current; wherein the content of the first and second substances,
the first preset voltage is 260V-275V, and the first preset current is 14000A-16000A; the second preset voltage is 260V-285V, and the second preset current is 29000A-31000A.
Preferably, the method is characterized in that the power supply and cut-off treatment is carried out in one period, and the power supply and cut-off times are not more than two.
Preferably, after the online voltage is adjusted to a second preset voltage, the current is adjusted to a second preset current, and the power supply time is 9-10 minutes, the method further comprises the following steps:
and carrying out first power-off operation on the ladle refining furnace.
Preferably, after the ladle refining furnace is powered by the third preset voltage and the current of the power supply is the third preset current, the method further comprises the following steps:
and when the temperature of the molten steel in the ladle refining furnace reaches a preset temperature, carrying out secondary power-off operation on the ladle refining furnace.
Preferably, the third preset voltage is 265V-295V, and the third preset current is 20000A-35000A.
Preferably, the three preset voltages are 271.6-V288.7V.
Preferably, the first preset voltage is 263.8V-271.6V, and the first preset current is 15000A; the second preset voltage is 263.8V-279.9V, and the second preset current is 30000A.
By the technical scheme, the power transmission method of the ladle refining furnace provided by the invention has the beneficial effects that when in use: through the control of the power transmission of the ladle refining furnace, the nitrogen atom content in the molten steel can be effectively reduced, so that the performance of the steel is improved, and the shaping and impact toughness of the steel are ensured.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a block flow diagram of a ladle refining furnace power delivery method provided in a preferred embodiment of the invention;
fig. 2 is a block flow diagram of a ladle refining furnace power transmission method provided in a preferred embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1, the invention provides a ladle refining furnace power transmission method, which comprises the following steps:
adopting a first preset voltage to supply power to the ladle refining furnace, wherein the supplied current is a first preset current, and the power supply time is 1-2 minutes;
under the condition that the electric arc is stable, adjusting the voltage to a second preset voltage on line, adjusting the current to a second preset current, and keeping the power transmission time to be 9-10 minutes;
a third preset voltage is adopted to supply power to the ladle refining furnace, and the supplied current is a third preset current; wherein the content of the first and second substances,
the first preset voltage is 260V-275V, and the first preset current is 14000A-16000A; the second preset voltage is 260V-285V, and the second preset current is 29000A-31000A.
In the scheme, because the slag layer is thinner in the initial heating stage, in order to meet the requirement of arc temperature rise, low-voltage smelting is required, the initial heating voltage is 243- & ltSUB & gt 260V, but the power of 243- & ltSUB & gt 260V is too small, the slagging time is long, and the N content in the molten steel can be increased after the molten steel is exposed for a long time. Meanwhile, the electric arc is unstable 1-2 minutes before heating, the nitrogen ionization amount is increased when a large current 30000A is ignited, and the content of N in molten steel is increased, so that the voltage, the current and the power transmission time in the initial heating stage are controlled in the invention, and an on-line adjustment scheme is also arranged under the power transmission specification, namely, under the condition that the electric arc is stable, the voltage is adjusted to a second preset voltage on line, the current is adjusted to a second preset current, the power transmission time is kept for 9-10 minutes, and the power transmission specifications such as the voltage are adjusted according to the actual condition of the electric arc, so that the quality of the molten steel can be effectively ensured, and the content of N in the molten steel is reduced.
In a preferred embodiment of the present invention, the method is characterized in that the power supply and cut-off process is performed in one cycle, and the power supply and cut-off times are not more than twice.
In the prior art, power failure is not controlled by any planning, power failure operation is carried out if raw materials are required to be added or molten steel is required to be checked, but the power failure operation does not take into consideration that the more the power transmission times are, the more the molten steel N is sucked in the arc moment is, and the influence on the quality of the molten steel is also caused, so that the power failure operation is limited, namely the power transmission times are not more than three times.
In a preferred embodiment of the present invention, as shown in fig. 2, after the online voltage is adjusted to a second preset voltage, the current is adjusted to a second preset current, and the power supply time is 9-10 minutes, the method further comprises:
and carrying out first power-off operation on the ladle refining furnace.
In a preferred embodiment of the present invention, after the step of supplying power to the ladle refining furnace at the third predetermined voltage and supplying power at the third predetermined current, the method further comprises:
and when the temperature of the molten steel in the ladle refining furnace reaches a preset temperature, carrying out secondary power-off operation on the ladle refining furnace.
In the scheme, the number of times of power transmission for the normal furnace time of the cycle is controlled to be 3. The first power-off stage is a first power-on stage, the second power-on stage needs to be directly heated to the tapping temperature according to the outbound time and the current temperature, the temperature is finely adjusted to the tapping temperature in the third temperature-up stage before the outbound, and the N absorption amount of molten steel is reduced by reducing the power-on times, so that the quality of the molten steel is ensured.
In a preferred embodiment of the present invention, the third predetermined voltage is 265V-295V, and the third predetermined current is 20000A-35000A.
In a preferred embodiment of the present invention, the three preset voltages are 271.6-V288.7V.
In a preferred embodiment of the present invention, the first preset voltage is 263.8V-271.6V, and the first preset current is 15000A; the second preset voltage is 263.8V-279.9V, and the second preset current is 30000A.
In the scheme, the N content in the molten steel can be more effectively improved under the preset voltage and the preset current, so that the quality of the molten steel is improved.
It should also be noted that the ladle refining furnace provided in the present invention is generally referred to as a 120t ladle refining furnace.
In conclusion, the power transmission method of the ladle refining furnace provided by the invention can effectively reduce the nitrogen atom content in the molten steel by controlling the power transmission of the ladle refining furnace, thereby improving the performance of the steel and ensuring the shaping and impact toughness of the steel.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (7)
1. A power transmission method for a ladle refining furnace is characterized by comprising the following steps:
adopting a first preset voltage to supply power to the ladle refining furnace, wherein the supplied current is a first preset current, and the power supply time is 1-2 minutes;
under the condition that the electric arc is stable, adjusting the voltage to a second preset voltage on line, adjusting the current to a second preset current, and keeping the power transmission time to be 9-10 minutes;
a third preset voltage is adopted to supply power to the ladle refining furnace, and the supplied current is a third preset current; wherein the content of the first and second substances,
the first preset voltage is 260V-275V, and the first preset current is 14000A-16000A; the second preset voltage is 260V-285V, and the second preset current is 29000A-31000A.
2. The ladle refining furnace power transmission method according to claim 1, wherein power transmission and power disconnection processing is performed in one cycle, and the power disconnection times are not more than twice.
3. The ladle refining furnace power transmission method according to claim 2, wherein after the online voltage regulation is performed to a second preset voltage, the current is performed to a second preset current, and the power supply time is 9-10 minutes, the method further comprises the following steps:
and carrying out first power-off operation on the ladle refining furnace.
4. The ladle refining furnace power transmission method according to claim 2, wherein after the power is supplied to the ladle refining furnace at a third preset voltage and the current is the third preset current, the method further comprises:
and when the temperature of the molten steel in the ladle refining furnace reaches a preset temperature, carrying out secondary power-off operation on the ladle refining furnace.
5. The ladle refining furnace power transmission method according to claim 3, wherein the third preset voltage is 265V-295V, and the third preset current is 20000A-35000A.
6. The ladle refining furnace power transmission method according to claim 5, wherein the three preset voltages are 271.6-V288.7V.
7. The ladle refining furnace power transmission method according to claim 1, wherein the first preset voltage is 263.8V-271.6V, and the first preset current is 15000A; the second preset voltage is 263.8V-279.9V, and the second preset current is 30000A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010213584.6A CN111313487A (en) | 2020-03-24 | 2020-03-24 | Power transmission method for ladle refining furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010213584.6A CN111313487A (en) | 2020-03-24 | 2020-03-24 | Power transmission method for ladle refining furnace |
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| CN111313487A true CN111313487A (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010213584.6A Pending CN111313487A (en) | 2020-03-24 | 2020-03-24 | Power transmission method for ladle refining furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114985715A (en) * | 2022-06-21 | 2022-09-02 | 芜湖新兴铸管有限责任公司 | Multi-group air brick steel ladle equipment and steel ladle smelting control method |
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|---|---|---|---|---|
| CN103740892A (en) * | 2014-01-27 | 2014-04-23 | 山西太钢不锈钢股份有限公司 | Method for reducing nitrogen content of molten steel of austenitic stainless steel of ladle furnace |
| CN104846146A (en) * | 2014-02-13 | 2015-08-19 | 宝山钢铁股份有限公司 | Control method for preventing nitrogen increasing in LF refining treatment |
| CN109136462A (en) * | 2018-08-16 | 2019-01-04 | 江苏久华环保科技股份有限公司 | A kind of electric arc furnace smelting method of supplying power to |
| CN109457076A (en) * | 2018-10-23 | 2019-03-12 | 湖南华菱涟源钢铁有限公司 | A kind of control method of nitrogen content of molten steel |
-
2020
- 2020-03-24 CN CN202010213584.6A patent/CN111313487A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103740892A (en) * | 2014-01-27 | 2014-04-23 | 山西太钢不锈钢股份有限公司 | Method for reducing nitrogen content of molten steel of austenitic stainless steel of ladle furnace |
| CN104846146A (en) * | 2014-02-13 | 2015-08-19 | 宝山钢铁股份有限公司 | Control method for preventing nitrogen increasing in LF refining treatment |
| CN109136462A (en) * | 2018-08-16 | 2019-01-04 | 江苏久华环保科技股份有限公司 | A kind of electric arc furnace smelting method of supplying power to |
| CN109457076A (en) * | 2018-10-23 | 2019-03-12 | 湖南华菱涟源钢铁有限公司 | A kind of control method of nitrogen content of molten steel |
Non-Patent Citations (1)
| Title |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114985715A (en) * | 2022-06-21 | 2022-09-02 | 芜湖新兴铸管有限责任公司 | Multi-group air brick steel ladle equipment and steel ladle smelting control method |
| CN114985715B (en) * | 2022-06-21 | 2023-11-17 | 芜湖新兴铸管有限责任公司 | Ladle equipment with multiple groups of air bricks and ladle smelting control method |
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Application publication date: 20200619 |
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