CN114646215A - Method for controlling aluminum liquid temperature of aluminum alloy casting-rolling holding furnace - Google Patents
Method for controlling aluminum liquid temperature of aluminum alloy casting-rolling holding furnace Download PDFInfo
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- CN114646215A CN114646215A CN202210310302.3A CN202210310302A CN114646215A CN 114646215 A CN114646215 A CN 114646215A CN 202210310302 A CN202210310302 A CN 202210310302A CN 114646215 A CN114646215 A CN 114646215A
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- furnace
- temperature
- aluminum liquid
- aluminum
- eta
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 72
- 239000007788 liquid Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005096 rolling process Methods 0.000 title claims abstract description 15
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 238000004321 preservation Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000005485 electric heating Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/20—Arrangement of controlling, monitoring, alarm or like devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention relates to the technical field of aluminum alloy casting and rolling, in particular to a method for controlling the temperature of aluminum liquid in an aluminum alloy casting and rolling heat preservation furnace, which is used for accurately controlling the temperature of furnace gas in an electric heating heat preservation furnace and keeping the temperature of the aluminum liquid in the furnace within the process requirement range and comprises the following steps: measuring the height of the aluminum liquid in the heat preservation furnace; setting the heating power of the holding furnace; and adjusting the heating power of the holding furnace. The method realizes the stable control of the temperature of the aluminum liquid in the heat preservation furnace by adjusting the heating power of the heat preservation furnace and adopting the method of continuously controlling the temperature of the furnace gas, is simple, convenient and easy to implement, has obvious effect, can control the overburning problem of the aluminum liquid to a great extent, reduces the energy waste and reduces the production cost while improving the internal quality of cast-rolled products.
Description
Technical Field
The invention relates to the technical field of aluminum alloy casting and rolling, in particular to a method for controlling the temperature of aluminum liquid in an aluminum alloy casting and rolling holding furnace.
Background
The holding furnace is important equipment in the aluminum alloy casting and rolling process, plays an important role in aluminum liquid distribution, temperature adjustment and melt purification in the aluminum alloy casting and rolling process, and the temperature control method has great influence on accurate and stable control of the aluminum liquid temperature.
In the temperature control method in the prior art, an operator frequently measures the temperature of aluminum liquid in a heat preservation furnace, high-power heating is started when the temperature is lower than the lower limit of process control, the aluminum liquid is rapidly heated, the heating power is reduced according to experience after the temperature of the aluminum liquid is heated to reach the upper limit of the process temperature, a heat preservation mode is entered, and the temperature is heated again when the temperature is lower than the lower limit of the process temperature. The traditional operation method mainly has the following defects that firstly, the heat preservation furnace is in frequent heating temperature rise and empirical heat preservation, but the empirical heat preservation is not completely reliable, the temperature is always in continuous fluctuation, and the stability is poor; secondly, high-power heating can ensure that high-temperature furnace gas can overheat the surface layer aluminum liquid in the heat preservation furnace, so that serious overburning of the aluminum liquid is caused, and the internal quality of cast-rolled products is influenced; thirdly, frequent temperature measurement causes more times of opening the furnace door, more consumption of handheld thermocouples and higher labor intensity of operators, and also causes great loss of heat of the holding furnace, thereby causing energy waste and being not beneficial to environmental protection.
Disclosure of Invention
The invention aims to provide a method for controlling the temperature of aluminum liquid in an aluminum alloy casting-rolling holding furnace, which can keep the temperature of the aluminum liquid in the holding furnace and the temperature of the output aluminum liquid stable, effectively avoid the influence of temperature fluctuation on the quality of cast-rolled products and reduce the defects of uneven grain structure and large grains in the cast-rolled products.
In order to solve the technical problem, the method for controlling the temperature of the aluminum liquid in the aluminum alloy casting-rolling holding furnace comprises the following steps:
s1, measuring the height of aluminum liquid in a heat preservation furnace, and recording the height of the aluminum liquid as h;
s2, setting the heating power of the holding furnace according to the height h of the aluminum liquid measured in the step S, wherein the rated heating power of the holding furnace is PRated valueThe actual heating power of the holding furnace is PPractice of，PPractice of=η·PRated valueIn the formula, eta is the heating power coefficient,
s2.1, when h is less than 200mm, eta is set to be 0.45-0.55, and the temperature T of furnace gas is 750 +/-5 ℃;
s2.2, when h is more than or equal to 200mm and less than or equal to 400mm, eta is set to be 0.56-0.65, and the temperature T of furnace gas is 760 +/-5 ℃;
s2.3, when h is more than or equal to 401mm and less than or equal to 600mm, eta is set to be 0.66-0.75, and the temperature T of furnace gas is 770 +/-5 ℃;
s2.4, when h is more than or equal to 601mm and less than or equal to 800mm, eta is set to be 0.76-0.85, and the temperature T of furnace gas is 780 +/-5 ℃;
s2.5, when h is more than or equal to 801mm and less than or equal to 1000mm, eta is set to be 0.86-0.95, and the temperature T of furnace gas is 790 +/-5 ℃;
s3, when the height h of the aluminum liquid in the heat preservation furnace changes, repeating the steps S1 and S2 to adjust until the production is finished.
Further, the holding furnace aluminum liquid can be rapidly raised when the smelting furnace is turned over, so that eta is set to be 0.86 before the smelting furnace is turned over, and the adjustment is carried out according to the steps S1 and S2 after the turning over is finished.
Further, the temperature of the molten aluminum is maintained at 735-745 ℃ during the adjustment in step S2.
The shape and the size of the bottom of the holding furnace are fixed according to a volume formula V = SBottomH, the height h of the aluminum liquid in the heat preservation furnace can be equal to the volume of the aluminum liquid and the quality of the aluminum liquid.
The invention has the beneficial effects that:
1. the invention adopts the continuous temperature control method of the furnace gas of the holding furnace to replace the traditional short-time high-temperature control operation method based on personal experience, realizes the stable control of the temperature of the aluminum liquid in the holding furnace and the temperature of the aluminum liquid output by the holding furnace according to the mode of continuously controlling the temperature of the furnace gas according to the height change of the aluminum liquid, avoids the large fluctuation of the temperature of the aluminum liquid in the holding furnace caused by the rapid change of the temperature of the furnace gas, and reduces the influence of the holding heating process on the overburning of the aluminum liquid;
2. the temperature of the aluminum liquid in the heat preservation furnace and the temperature of the output aluminum liquid can be kept stable, the influence of temperature fluctuation in the subsequent casting and rolling process on the quality of cast and rolled products is effectively avoided, and the defects of uneven grain structure and large grains in the cast and rolled products are obviously reduced;
3. the times of opening the furnace door due to the temperature measurement requirement of the holding furnace are obviously reduced, the labor intensity of operators is reduced, the consumption of thermocouples is reduced, the heat loss is effectively controlled, and the energy waste is reduced;
4. the frequent start and stop of the silicon carbide rod of the heating device in the heat preservation furnace are avoided, the service life of the silicon carbide rod is prolonged, and the production cost is reduced.
Detailed Description
The invention relates to a method for controlling the temperature of molten aluminum in an aluminum alloy casting-rolling holding furnace, which comprises the following steps:
s1, measuring the height of aluminum liquid in a heat preservation furnace, and recording the height of the aluminum liquid as h;
s2, setting the heating power of the holding furnace according to the height h of the aluminum liquid measured in the step S, wherein the rated heating power of the holding furnace is PRated valueThe actual heating power of the holding furnace is PPractice of，PPractice of=η·PRated valueIn the formula, eta is the heating power coefficient,
s2.1, when h is less than 200mm, eta is set to be 0.45-0.55, and the temperature T of furnace gas is 750 +/-5 ℃;
s2.2, when h is more than or equal to 200mm and less than or equal to 400mm, eta is set to be 0.56-0.65, and the temperature T of furnace gas is 760 +/-5 ℃;
s2.3, when h is more than or equal to 401mm and less than or equal to 600mm, eta is set to be 0.66-0.75, and the temperature T of furnace gas is 770 +/-5 ℃;
s2.4, when h is more than or equal to 601mm and less than or equal to 800mm, eta is set to be 0.76-0.85, and the temperature T of furnace gas is 780 +/-5 ℃;
s2.5, when h is more than or equal to 801mm and less than or equal to 1000mm, eta is set to be 0.86-0.95, and the temperature T of furnace gas is 790 +/-5 ℃;
s3, when the height h of the aluminum liquid in the heat preservation furnace changes, repeating the steps S1 and S2 to adjust until the production is finished.
Further, the holding furnace aluminum liquid can be rapidly raised when the smelting furnace is turned over, so that eta is set to be 0.86 before the smelting furnace is turned over, and the adjustment is carried out according to the steps S1 and S2 after the turning over is finished.
Further, the temperature of the molten aluminum is maintained at 735-745 ℃ during the adjustment in the step S2.
The first embodiment is as follows:
when a certain 30t electric heating holding furnace is used by the method,
and S1, measuring the height h =862mm of the aluminum liquid in the heat preservation furnace by using an aluminum liquid measuring device.
According to the data correspondence of the table in step S2:
according to the height h =862mm of the aluminum liquid measured in the step S1, the heating power coefficient eta is set to be 0.86-0.95 by combining the heating power of the holding furnace and the setting temperature of the furnace gas given in the step S2 with the setting table of the change of the height of the aluminum liquid in the furnace, and through measurement, when eta is set to be 0.92, the temperature of the furnace gas of the holding furnace is stably maintained between 792 ℃ and 794 ℃, and the temperature of the aluminum liquid is stably maintained between 738 and 740 ℃.
Example two:
and step S1, measuring the height h =410mm of the aluminum liquid in the heat preservation furnace by using an aluminum liquid measuring device.
According to the step S2, eta is set to 0.66-0.75, and it is measured that when eta is set to 0.66, the temperature of furnace gas of the holding furnace can be stably maintained between 765-768 ℃ and the temperature of aluminum liquid is stably maintained between 740-742 ℃.
Example three:
and step S1, measuring the height h =187mm of the aluminum liquid in the heat preservation furnace by using an aluminum liquid measuring device.
According to the step S2, eta is set to 0.45-0.55, and it is measured that when eta is set to 0.53, the temperature of furnace gas of the holding furnace can be stably maintained at 752-740 ℃, and the temperature of aluminum liquid is stably maintained at 738-740 ℃.
Because h =187mm, the height of the aluminum liquid has reached a lower level, the melting furnace needs to be turned over to maintain the supply of the aluminum liquid at the moment in the continuous production process, the liquid level of the aluminum liquid in the reversing process of the melting furnace can be quickly raised by the holding furnace, the heating power coefficient eta of the holding furnace is preset to 0.86 before the furnace is turned over, the liquid level height h =825mm of the redundant holding furnace after the furnace is turned over is preset, the heating power coefficient eta is set to 0.86-0.95 according to the step S2, the measurement is carried out, when the heating power coefficient eta is set to 0.91, the temperature of furnace gas of the holding furnace can be stably kept between 792 and 795 ℃, and the temperature of the aluminum liquid is stabilized between 739 and 741 ℃. With the reduction of the height of the molten aluminum in the heat-insulating furnace in the continuous production process, the steps S1 and S2 are repeated at different molten aluminum heights until the production is finished.
Example four:
and step S1, measuring the height h =161mm of the aluminum liquid in the heat preservation furnace by using an aluminum liquid measuring device.
According to the step S2, eta is set to 0.45-0.55, and it is measured that when eta is set to 0.46, the furnace gas temperature of the holding furnace can be stably maintained at 748-.
And (3) the height h =161mm of the aluminum liquid reaches the lower limit of the normal production of the holding furnace, the aluminum liquid in the holding furnace is drained under the condition of keeping the setting of the power coefficient eta =0.46 according to a shutdown plan, and then the furnace is shut down.
Claims (3)
1. A method for controlling the temperature of molten aluminum in an aluminum alloy casting-rolling holding furnace is characterized by comprising the following steps: the method comprises the following steps:
s1, measuring the height of aluminum liquid in a heat preservation furnace, and recording the height of the aluminum liquid as h;
s2, setting the heating power of the holding furnace according to the height h of the aluminum liquid measured in the step S, wherein the rated heating power of the holding furnace is PRated valueThe actual heating power of the holding furnace is PPractice of，PPractice of=η·PRated valueIn the formula, eta is a heating power coefficient;
s2.1, when h is less than 200mm, eta is set to be 0.45-0.55, and the temperature T of furnace gas is 750 +/-5 ℃;
s2.2, when h is more than or equal to 200mm and less than or equal to 400mm, eta is set to be 0.56-0.65, and the temperature T of furnace gas is 760 +/-5 ℃;
s2.3, when h is more than or equal to 401mm and less than or equal to 600mm, eta is set to be 0.66-0.75, and the temperature T of furnace gas is 770 +/-5 ℃;
s2.4, when h is more than or equal to 601mm and less than or equal to 800mm, eta is set to be 0.76-0.85, and the temperature T of furnace gas is 780 +/-5 ℃;
s2.5, when h is more than or equal to 801mm and less than or equal to 1000mm, eta is set to be 0.86-0.95, and the temperature T of furnace gas is 790 +/-5 ℃;
s3, when the height h of the aluminum liquid in the heat preservation furnace changes, repeating the steps S1 and S2 to adjust until the production is finished.
2. The method for controlling the aluminum liquid temperature of the aluminum alloy casting-rolling holding furnace according to claim 1, which is characterized by comprising the following steps: and the molten aluminum in the holding furnace is quickly raised when the smelting furnace is turned over, so that eta is set to be 0.86 before the smelting furnace is turned over, and the regulation is carried out according to the steps S1 and S2 after the turning over is finished.
3. The method for controlling the aluminum liquid temperature of the aluminum alloy casting-rolling holding furnace according to claim 1, which is characterized by comprising the following steps: when the step S2 is adjusted, the temperature of the molten aluminum is kept at 735-745 ℃.
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| CN202210310302.3A CN114646215B (en) | 2022-03-28 | 2022-03-28 | Control method for aluminum liquid temperature of aluminum alloy casting and rolling heat preservation furnace |
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| CN114646215B CN114646215B (en) | 2023-12-15 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990040535U (en) * | 1999-05-24 | 1999-12-06 | 김오흠 | Middle heating type aluminum melting and holding furnace |
| JP2001050528A (en) * | 1999-08-10 | 2001-02-23 | Takuma Co Ltd | Operation method of electric melting furnace |
| CN103557704A (en) * | 2013-10-12 | 2014-02-05 | 深圳市华星光电技术有限公司 | Crucible heating device and method |
| CN107557528A (en) * | 2017-08-28 | 2018-01-09 | 中国科学院宁波材料技术与工程研究所 | A kind of molten steel temperature regulation and control method and its device |
| CN209334675U (en) * | 2018-12-06 | 2019-09-03 | 有研工程技术研究院有限公司 | A kind of Multi-station circulating alloy holding furnace feeding system |
| CN211451829U (en) * | 2019-11-27 | 2020-09-08 | 佛山市南海区瀚崴电子五金有限公司 | Smelting furnace equipment |
| CN113606944A (en) * | 2021-07-20 | 2021-11-05 | 甘肃酒钢天成彩铝有限责任公司 | Method for controlling temperature of molten aluminum in electric heating smelting furnace |
| CN113834329A (en) * | 2021-09-22 | 2021-12-24 | 四川实美科技有限公司 | Refining furnace smelting temperature control method and device for aluminum bar production |
-
2022
- 2022-03-28 CN CN202210310302.3A patent/CN114646215B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990040535U (en) * | 1999-05-24 | 1999-12-06 | 김오흠 | Middle heating type aluminum melting and holding furnace |
| JP2001050528A (en) * | 1999-08-10 | 2001-02-23 | Takuma Co Ltd | Operation method of electric melting furnace |
| CN103557704A (en) * | 2013-10-12 | 2014-02-05 | 深圳市华星光电技术有限公司 | Crucible heating device and method |
| CN107557528A (en) * | 2017-08-28 | 2018-01-09 | 中国科学院宁波材料技术与工程研究所 | A kind of molten steel temperature regulation and control method and its device |
| CN209334675U (en) * | 2018-12-06 | 2019-09-03 | 有研工程技术研究院有限公司 | A kind of Multi-station circulating alloy holding furnace feeding system |
| CN211451829U (en) * | 2019-11-27 | 2020-09-08 | 佛山市南海区瀚崴电子五金有限公司 | Smelting furnace equipment |
| CN113606944A (en) * | 2021-07-20 | 2021-11-05 | 甘肃酒钢天成彩铝有限责任公司 | Method for controlling temperature of molten aluminum in electric heating smelting furnace |
| CN113834329A (en) * | 2021-09-22 | 2021-12-24 | 四川实美科技有限公司 | Refining furnace smelting temperature control method and device for aluminum bar production |
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