CN109186793B - Method for measuring heat preservation performance of metallurgical melt heat preservation agent - Google Patents
Method for measuring heat preservation performance of metallurgical melt heat preservation agent Download PDFInfo
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- CN109186793B CN109186793B CN201811025403.6A CN201811025403A CN109186793B CN 109186793 B CN109186793 B CN 109186793B CN 201811025403 A CN201811025403 A CN 201811025403A CN 109186793 B CN109186793 B CN 109186793B
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- 238000004321 preservation Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 74
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 38
- 229910052742 iron Inorganic materials 0.000 claims abstract description 31
- 238000003723 Smelting Methods 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 238000010079 rubber tapping Methods 0.000 claims abstract description 5
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 4
- 239000011449 brick Substances 0.000 claims description 4
- 238000003892 spreading Methods 0.000 claims description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 3
- 241000209094 Oryza Species 0.000 description 4
- 235000007164 Oryza sativa Nutrition 0.000 description 4
- 235000009566 rice Nutrition 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
A method for measuring the heat preservation performance of a metallurgical melt heat preservation agent comprises the following steps of connecting a No. 1 temperature measurement couple, a No. 2 temperature measurement couple and a temperature recorder with a control computer; smelting according to a test steel smelting procedure, and smelting and tapping; chiseling a small pit in the central area of the high-temperature steel ingot, and inserting and fixing a No. 1 temperature measuring couple; pouring the heat preservation agent into the riser of the ingot mold, and inserting a No. 2 temperature measurement thermocouple into a position about 2-5 mm below the surface of the heat preservation agent; measuring by a No. 1 temperature measuring couple and a No. 2 temperature measuring couple; calculating the average cooling rate M of the steel ingot added with the heat preservation agent and the attenuation degree R of the heat preservation capability of the heat preservation agent; the method is used for representing the heat preservation performance and the stability of the heat preservation performance of the molten iron heat preservation agent. The invention solves the problem that the prior art can not represent the measurement of the heat preservation capability of the molten iron heat preservation agent under the temperature condition of the actual working range. The invention has strong adaptability, is not influenced by the components and physical state of the heat insulating agent, and is suitable for transverse comparison of heat insulating performance of different types of molten iron heat insulating agents.
Description
Technical Field
The invention relates to the field of heat preservation of metallurgical melts, in particular to a method for measuring the heat preservation performance of a heat preservation agent of metallurgical melts.
Background
The hot metal ladle and torpedo ladle are basic equipments in the iron works, and the iron loss and temperature reduction, i.e. heat loss, are inevitable when the molten iron produced by the blast furnace is sent to the next process. Relatively speaking, the temperature drop of the open hot metal ladle is obviously higher than that of a torpedo ladle under the same condition due to the poor heat preservation condition of the open hot metal ladle.
The temperature of the molten iron has great influence on steel making. According to the converter smelting process, the heat of converter smelting basically comes from the physical heat and the chemical heat of molten iron. Under certain chemical heat conditions, the physical heat of molten iron is a key factor for determining whether smelting can be carried out smoothly. The low temperature of molten iron can cause the consequences of large blowing loss of the converter, high consumption of steel materials, no guarantee of molten steel quality, reduction of furnace life and the like. The temperature of the molten iron is very important to the steelmaking process and has influence on the molten iron conveying. If the temperature of the molten iron is too low in the conveying process, the molten iron tank car can be incrusted and nodulated, and the normal production operation is directly influenced.
In order to fully utilize the heat of molten iron, ensure normal smelting of steel varieties and achieve the aim of reducing energy consumption, metallurgical enterprises obviously reduce the temperature reduction range of the molten iron by adding various heat preservation agents such as carbonized rice hulls, fly ash and composite heat preservation agents into the molten iron, and meet the requirements of steel making on the temperature of the molten iron.
However, at present, no standard of a method for measuring the heat preservation performance of the molten iron heat preservation agent exists at home and abroad, the heat preservation performance of the heat preservation agent can be predicted only by methods such as component, density, low-temperature measurement and the like, quantitative characterization can not be carried out in the actual use temperature range of the molten iron heat preservation, and transverse comparison can not be carried out on the heat preservation performance of different types of heat preservation agents.
In summary, in the prior art, the heat insulating property of the molten iron holding agent cannot be effectively measured, and particularly quantitative characterization cannot be performed in the actual use temperature range of the molten iron holding agent, so research and development of a method for measuring the heat insulating property according to the actual use temperature range of the holding agent are required.
Disclosure of Invention
The invention aims to provide a method for measuring the heat preservation performance of a metallurgical melt heat preservation agent, which overcomes the defects in the prior art, is convenient to use, low in cost and strong in adaptability, is not influenced by the components and physical state of the heat preservation agent, and can realize the measurement of the heat preservation performance under the temperature condition in the actual working range.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for measuring the heat preservation performance of a metallurgical melt heat preservation agent comprises the following steps:
1) connecting the No. 1 temperature measuring couple, the No. 2 temperature measuring couple and the temperature recorder with a control computer;
2) smelting in a vacuum smelting furnace according to a test steel smelting procedure, and tapping after smelting is finished;
3) hoisting the smelted high-temperature ingot mould to a region to be measured in temperature, and removing a riser brick to expose the surface of the high-temperature ingot solidified on the shell;
4) chiseling a small pit with the depth of at least 5mm in the central area of the high-temperature steel ingot, then inserting and fixing a No. 1 temperature measurement couple, and recording the temperature measurement result of the steel ingot as T1；
5) Pouring the heat-insulating agent into the riser of the ingot mold, uniformly spreading, inserting a No. 2 temperature-measuring couple into a position about 2-5 mm below the surface of the heat-insulating agent, and recording the temperature-measuring result of the heat-insulating agent as T2；
6) Starting temperature measurement until the temperatures displayed by the No. 1 temperature measurement couple and the No. 2 temperature measurement couple are reduced to the steel ingot finishing temperature; the measurement result of the No. 1 temperature measurement couple is the temperature of the steel ingot and is recorded as T when the time is T1tWhen T is 0, the ingot temperature is the initial measured temperature and is marked as T10And the temperature of the steel ingot is recorded as T when the temperature measurement of the steel ingot is finished1n(ii) a The measurement result of the No. 2 temperature measurement couple is the temperature of the heat preservation agent, and the measurement result when the time is T is recorded as T2tWhen T is 0, the temperature of the holding agent is the initial measurement temperature and is denoted as T20And the temperature of the heat-insulating agent is recorded as T when the temperature measurement is finished2n；T10、T20The value range is 1150-1n、T2nThe value range is 650 plus 550 ℃, and the total temperature measurement time is recorded as tn；
7) The average cooling rate of the steel ingot added with the heat insulating agent in the measurement temperature range is recorded as M, and then M can be calculated according to the following formula:
8) the attenuation degree of the heat preservation capacity of the heat preservation agent under the temperature conditions corresponding to different measurement time is recorded as R, and the attenuation degree R of the heat preservation capacity of the heat preservation agent when the time is t can be calculated according to the following formula:
9) finally, the average cooling rate M of the steel ingot added with the heat preservation agent in a measured temperature range represents the heat preservation performance of the type of molten iron heat preservation agent in a working temperature range, and the heat preservation capability attenuation degree R of the heat preservation agent under different temperature conditions represents the stability of the heat preservation performance of the type of molten iron heat preservation agent in the working temperature range.
The temperature measuring thermocouple is a K-type thermocouple.
The steel ingot is ordinary carbon steel or low carbon steel.
Compared with the prior art, the invention has the beneficial effects that:
1) the problem that the heat preservation capability of the molten iron heat preservation agent under the temperature condition of the actual working range cannot be measured in the prior art is solved.
2) The test conditions of the measuring method mainly depend on the self equipment of the metallurgical enterprise, the use is convenient, the cost is low, the adaptability is strong, the measuring method is not influenced by the components and the physical state of the heat insulating agent, and the measuring method is particularly suitable for transverse comparison of the heat insulating performance of different types of molten iron heat insulating agents, which is hard to compare with other methods.
Detailed Description
The following further illustrates embodiments of the invention:
a method for measuring the heat preservation performance of a metallurgical melt heat preservation agent comprises the following steps:
1) and the No. 1 temperature measuring couple, the No. 2 temperature measuring couple and the temperature recorder are connected with a control computer. Weighing a heat insulating agent according to the depth of the riser of the ingot, wherein the adding amount of the heat insulating agent is 30-100mm of the depth of the riser of the ingot.
2) Smelting in a vacuum smelting furnace according to a test steel smelting procedure, and tapping after smelting.
3) And hoisting the high-temperature ingot mould just smelted to a temperature-to-be-measured area by using a crown block, and removing the riser brick to expose the surface of the high-temperature ingot with the solidified shell.
4) Chiseling a small pit with the depth of at least 5mm in the central area of the high-temperature steel ingot, and thenInserting and fixing a No. 1 temperature measurement couple, and recording the temperature measurement result of the steel ingot as T1。
5) Pouring the weighed heat-insulating agent into the riser of the ingot mold, uniformly spreading, inserting a No. 2 temperature-measuring couple into a position about 2-5 mm below the surface of the heat-insulating agent, and recording the temperature-measuring result of the heat-insulating agent as T2。
6) Starting temperature measurement until the temperatures displayed by the No. 1 temperature measurement couple and the No. 2 temperature measurement couple are reduced to the steel ingot finishing temperature; the measurement result of the No. 1 temperature measurement couple is the temperature of the steel ingot and is recorded as T when the time is T1tWhen T is 0, the ingot temperature is the initial measured temperature and is marked as T10And the temperature of the steel ingot is recorded as T when the temperature measurement of the steel ingot is finished1n(ii) a The measurement result of the No. 2 temperature measurement couple is the temperature of the heat preservation agent, and the measurement result when the time is T is recorded as T2tWhen T is 0, the temperature of the holding agent is the initial measurement temperature and is denoted as T20And the temperature of the heat-insulating agent is recorded as T when the temperature measurement is finished2n；T10、T20The value range is 1150-1n、T2nThe value range is 650 plus 550 ℃, and the total temperature measurement time is recorded as tn；
7) The average cooling rate of the steel ingot added with the heat insulating agent in the measurement temperature range is recorded as M, and then M can be calculated according to the following formula:
8) the attenuation degree of the heat preservation capacity of the heat preservation agent under the temperature conditions corresponding to different measurement time is recorded as R, and the attenuation degree R of the heat preservation capacity of the heat preservation agent when the time is t can be calculated according to the following formula:
9) finally, the average cooling rate M of the steel ingot added with the heat preservation agent in a measured temperature range represents the heat preservation performance of the type of molten iron heat preservation agent in a working temperature range, and the heat preservation capability attenuation degree R of the heat preservation agent under different temperature conditions represents the stability of the heat preservation performance of the type of molten iron heat preservation agent in the working temperature range.
The temperature measuring thermocouple is a K-type thermocouple.
The steel ingot is ordinary carbon steel or low carbon steel.
Example 1:
a method for measuring the heat preservation performance of a metallurgical melt heat preservation agent comprises the following steps:
1) and the No. 1 temperature measuring couple, the No. 2 temperature measuring couple, the temperature recorder and the like are connected with a control computer.
2) Weighing quantitative molten iron heat insulating agent-carbonized rice husk.
3) Smelting in a vacuum smelting furnace according to a test steel smelting procedure, and tapping after smelting.
4) And hoisting the high-temperature ingot mould just smelted to a temperature-to-be-measured area by using a crown block, and removing the riser brick to expose the surface of the high-temperature ingot with the solidified shell.
5) And chiseling a small pit with the depth of 6mm in the central area of the high-temperature steel ingot, and then inserting and fixing a No. 1 temperature measuring couple.
6) Pouring the weighed heat preservation agent into the riser of the ingot mold, uniformly spreading, and then inserting the No. 2 temperature measurement galvanic couple into a position about 4mm below the surface of the heat preservation agent.
7) And (4) starting temperature measurement until the temperatures displayed by the No. 1 temperature measurement couple and the No. 2 temperature measurement couple are reduced to 600 ℃.
8) And calculating the cooling rate of the ingot added with the heat preservation agent between 1100 ℃ and 600 ℃ to obtain the cooling rate in the same temperature interval so as to represent the heat preservation performance of the heat preservation agent.
The ambient temperature was measured at 20 ℃.
The steel ingot is plain carbon steel.
Through calculation, the average cooling rate M of the experimental heat-preserving agent carbonized rice hulls is 0.13 ℃/min, and the attenuation degree R of the heat-preserving capability of the carbonized rice hulls when the temperature is reduced from 1100 ℃ to 600 ℃ is 41.52%.
Claims (3)
1. A method for measuring the heat preservation performance of a metallurgical melt heat preservation agent is characterized by comprising the following steps:
1) connecting the No. 1 temperature measuring couple, the No. 2 temperature measuring couple and the temperature recorder with a control computer;
2) smelting in a vacuum smelting furnace according to a test steel smelting procedure, and tapping after smelting is finished;
3) hoisting the smelted high-temperature ingot mould to a region to be measured in temperature, and removing a riser brick to expose the surface of the high-temperature ingot solidified on the shell;
4) chiseling a small pit with the depth of at least 5mm in the central area of the high-temperature steel ingot, then inserting and fixing a No. 1 temperature measurement couple, and recording the temperature measurement result of the steel ingot as T1；
5) Pouring the heat-insulating agent into the riser of the ingot mold, uniformly spreading, inserting a No. 2 temperature-measuring couple into a position about 2-5 mm below the surface of the heat-insulating agent, and recording the temperature-measuring result of the heat-insulating agent as T2；
6) Starting temperature measurement until the temperatures displayed by the No. 1 temperature measurement couple and the No. 2 temperature measurement couple are reduced to the steel ingot finishing temperature; the measurement result of the No. 1 temperature measurement couple is the temperature of the steel ingot and is recorded as T when the time is T1tWhen T is 0, the ingot temperature is the initial measured temperature and is marked as T10And the temperature of the steel ingot is recorded as T when the temperature measurement of the steel ingot is finished1n(ii) a The measurement result of the No. 2 temperature measurement couple is the temperature of the heat preservation agent, and the measurement result when the time is T is recorded as T2tWhen T is 0, the temperature of the holding agent is the initial measurement temperature and is denoted as T20And the temperature of the heat-insulating agent is recorded as T when the temperature measurement is finished2n；T10、T20The value range is 1150-1n、T2nThe value range is 650 plus 550 ℃, and the total temperature measurement time is recorded as tn；
7) The average cooling rate of the steel ingot added with the heat insulating agent in the measurement temperature range is recorded as M, and then M can be calculated according to the following formula:
8) the attenuation degree of the heat preservation capacity of the heat preservation agent under the temperature conditions corresponding to different measurement time is recorded as R, and the attenuation degree R of the heat preservation capacity of the heat preservation agent when the time is t can be calculated according to the following formula:
9) finally, the average cooling rate M of the steel ingot added with the heat preservation agent in a measured temperature range represents the heat preservation performance of the type of molten iron heat preservation agent in a working temperature range, and the heat preservation capability attenuation degree R of the heat preservation agent under different temperature conditions represents the stability of the heat preservation performance of the type of molten iron heat preservation agent in the working temperature range.
2. The method of claim 1, wherein the thermocouple is a type K thermocouple.
3. The method for measuring the heat preservation performance of the metallurgical melt heat preservation agent according to claim 1, wherein the steel ingot is plain carbon steel or low carbon steel.
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| CN109186793B true CN109186793B (en) | 2020-02-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59218259A (en) * | 1983-05-24 | 1984-12-08 | Fujikura Ltd | Controlling method of casting temperature |
| CN101070223A (en) * | 2007-06-29 | 2007-11-14 | 钢铁研究总院 | Heat-processing temperature-cntrolled heat-insulation material, its preparing method and use |
| CN103361034A (en) * | 2013-07-17 | 2013-10-23 | 河北联合大学 | Irregular-particle-shaped Chinese chestnut involucre heat-preserving material |
| CN104198525A (en) * | 2014-08-21 | 2014-12-10 | 河北联合大学 | Comparison method for measuring heat retaining effects of metallurgical heat retaining materials |
| CN104503510A (en) * | 2014-12-26 | 2015-04-08 | 北京神雾环境能源科技集团股份有限公司 | Temperature synchronizing system and method used for metallurgic performance measuring device |
-
2018
- 2018-09-04 CN CN201811025403.6A patent/CN109186793B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59218259A (en) * | 1983-05-24 | 1984-12-08 | Fujikura Ltd | Controlling method of casting temperature |
| CN101070223A (en) * | 2007-06-29 | 2007-11-14 | 钢铁研究总院 | Heat-processing temperature-cntrolled heat-insulation material, its preparing method and use |
| CN103361034A (en) * | 2013-07-17 | 2013-10-23 | 河北联合大学 | Irregular-particle-shaped Chinese chestnut involucre heat-preserving material |
| CN104198525A (en) * | 2014-08-21 | 2014-12-10 | 河北联合大学 | Comparison method for measuring heat retaining effects of metallurgical heat retaining materials |
| CN104503510A (en) * | 2014-12-26 | 2015-04-08 | 北京神雾环境能源科技集团股份有限公司 | Temperature synchronizing system and method used for metallurgic performance measuring device |
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