CN212526043U - Simulation test device for molten steel pouring process - Google Patents
Simulation test device for molten steel pouring process Download PDFInfo
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- CN212526043U CN212526043U CN202020958430.5U CN202020958430U CN212526043U CN 212526043 U CN212526043 U CN 212526043U CN 202020958430 U CN202020958430 U CN 202020958430U CN 212526043 U CN212526043 U CN 212526043U
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Abstract
The utility model discloses a simulation test device of molten steel pouring process, this test device are based on similar principle preparation, have higher accuracy, can truly simulate out motion action and the law of molten steel pouring in-process drainage sand in the middle of the package. By combining the test method, the floating removal and the outflow rate of the drainage sand are used as evaluation indexes, and the optimal working condition favorable for floating removal of the drainage sand can be obtained by designing different tundish flow control device structures and continuous casting process parameters, so that the tundish structure and the continuous casting process parameters favorable for removing the drainage sand in actual continuous casting production are obtained.
Description
Technical Field
The utility model relates to a simulation test device of molten steel pouring process, concretely relates to device of motion action of simulation drainage sand in middle package.
Background
In the molten metal continuous casting process, the automatic ladle casting technology is widely applied, the automatic ladle casting technology is realized by filling of the drainage sand and the automatic opening and closing function of the sliding plate, the basic principle is that the drainage sand is pre-buried in a ladle nozzle position, after converter tapping, high-temperature molten steel and the drainage sand are contacted to form a sintering layer, and a hard shell is formed at the upper part of the sintering layer; when the ladle is cast, the sliding plate is opened to enable the unsintered drainage sand at the lower part to flow out firstly, then the hard shell close to the molten steel is broken through under the action of the static pressure of the molten steel, and then the molten steel flows out along the same direction.
Generally, the drainage sand is siliceous or chromium, and the main components are SiO2 and Cr2O3、Fe2O3、Al2O3MgO, etc., having a size of between several micrometers and several thousand micrometers. For example, the invention patent application CN201410380216.5 discloses a platy corundum drainage sand and a preparation method thereof, which can effectively improve the automatic casting rate. Although the automatic casting technology is realized by using the drainage sand, a part of the drainage sand is floated and removed after entering the tundish molten steel, and a part of the drainage sand is remained in the molten steel to pollute the molten steel, so that the total oxygen content and the large inclusion content are increased sharply in the ladle changing process, and the production of high-quality clean steel is not facilitated. Although researchers have developed overflow devices for the drainage sand that drain and drain the sand before it enters the tundish bath, this may lead to safety issues in field operations. Researches show that the removal effect of the large inclusions can be improved by reasonably designing the flow control structure of the tundish and adjusting the continuous casting process parameters. For example, the invention patent application CN201611141850.9 discloses an argon blowing refining device and an argon control method for a continuous casting tundish, whichThe effect of removing the impurities in the molten steel by the tundish is improved; utility model patent application CN201822260226.1 discloses a subassembly is flowed in accuse of package in middle of the rectangle, inclusion in can effectively separating the steel improves the steel quality.
However, due to the complexity of the thermophysical behavior of the drainage sand and the movement of high-temperature multiphase flow, the existing published data do not relate to the evaluation of the movement behavior of the drainage sand in the tundish, and particularly lack the knowledge of the relationship between the floating removal of the drainage sand and a tundish flow control device, continuous casting process parameters and the like, so that a corresponding basic research method needs to be developed to obtain the optimum tundish structure and continuous casting process parameters in actual production to prevent the damage of large inclusions and improve the cleanliness of molten steel and the quality stability of products.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome the defect of the prior art, the utility model provides a molten steel pouring process's analogue test device can simulate the motion action of drainage sand in the middle package through the device to reach the middle package structure and the continuous casting technological parameter that are favorable to the drainage sand to get rid of in the actual continuous casting production.
The technical scheme is as follows: the utility model relates to a simulation test device for molten steel pouring process, which comprises a ladle model, a tundish model, a long nozzle model and a slide plate device which are formed by scaling down according to a similar principle; the ladle model is arranged above the tundish model, the sliding plate device is arranged at the bottom of an outlet of the ladle model, and the long nozzle model is arranged below the sliding plate device and extends into the tundish model; a heating device is arranged in the tundish model, the tundish model is provided with at least one liquid outlet, and the liquid outlet is correspondingly provided with a filtering and collecting device; the ladle filler sand simulation device is used for monitoring the liquid temperature in the ladle model and the tundish model.
Wherein the slide plate device is configured as a slide-open and slide-close valve structure for opening and closing an outlet of the ladle model and controlling an opening degree.
When the sliding plate device is in a closed state, the drainage sand simulant is accumulated at an outlet of the ladle model.
Further, the drainage sand simulant comprises a particle simulant and a bonding layer, wherein the bonding layer covers the particle simulant. A crust was formed on the drainage sand simulant by this bonding layer to simulate the sintered layer of an actual molten steel pour.
The tundish model is also internally provided with a flow control device, and the flow control device comprises at least one of a turbulence suppressor and a retaining wall. On one hand, the shape and the structure of the actual tundish are more accurately simulated, and on the other hand, the flow state in the tundish can be conveniently adjusted.
The ladle model, the tundish model, the long nozzle model and the sliding plate device are all made of organic glass. On the one hand, organic glass intensity is high and the light is transparent, can adapt to experimental impact and the more audio-visual mobile condition in each part of observation, and on the other hand, organic glass is convenient for the equipment of part and the adjustment of structure.
The particle simulant is hollow glass particles with the particle size ranging from micron to hundred micron and the density being less than that of water. The weight of the hollow glass particles is calculated according to a similar proportion, the density of the hollow glass particles is slightly smaller than that of water and is closer to the relative density of water and the relative density of the drainage sand in the molten steel, and therefore the movement behavior of the drainage sand in the molten steel can be simulated more accurately by adopting the hollow glass particles.
The test method of the simulation test device for the molten steel pouring process comprises the following steps:
(1) the sliding plate device is in an initial closed state, a drainage sand simulator is filled at an outlet of the ladle model, and the particle simulator is firstly stacked according to the stacking mode of the drainage sand in actual production; after the accumulation is finished, covering an adhesive layer on the upper part to simulate a sintering layer, wherein the adhesive layer is made of a substance which is solid at normal temperature, melted by heating and dissolved in water;
(2) adding hot water into the tundish model to a stable pouring liquid level, monitoring the water temperature in the tundish model by using a temperature monitoring device, and starting a heating device to maintain the water temperature in a preset temperature range;
(3) after the water temperature in the tundish model is stable, opening a liquid outlet of the tundish to enable water flow to flow out at a certain speed; meanwhile, after hot water is added into the ladle model, the sliding plate device is quickly opened, so that the drainage sand simulant is flushed into the tundish model by the hot water;
(4) gradually adjusting the opening of the sliding plate device, and controlling the water level of the tundish model to be maintained at a stable pouring liquid level;
(5) after pouring for a period of time, respectively collecting and weighing the particle simulants at a liquid outlet and a top liquid level of the tundish model, and calculating respective weight ratio to obtain an outflow rate and a removal rate;
(6) by changing the simulation parameters, the optimal tundish structure and process control parameters which are beneficial to preventing drainage sand from flowing out of the tundish outlet are fitted and obtained.
Wherein the temperature of the hot water added into the ladle model is about 5-20 ℃ higher than the temperature of the water in the tundish model. The state of the molten steel in the steel ladle and the middle ladle is simulated more accurately.
Further, the simulation parameters include the configuration of the flow control device in the tundish model, the outlet flow rate of the tundish model and the opening mode of the sliding plate device.
Has the advantages that: the test device is prepared based on the similar principle, has higher accuracy, and can truly simulate the motion behavior and the law of the drainage sand in the tundish in the molten steel pouring process. By combining the test method, the floating removal and the outflow rate of the drainage sand are used as evaluation indexes, and the optimal working condition favorable for floating removal of the drainage sand can be obtained by designing different tundish flow control device structures and continuous casting process parameters, so that the tundish structure and the continuous casting process parameters favorable for removing the drainage sand in actual continuous casting production are obtained.
Drawings
Fig. 1 is a schematic structural diagram of the testing device of the present invention.
Detailed Description
The present invention will be described in further detail with reference to fig. 1 and examples.
Example 1: according to the structures and the sizes of a steel ladle, a tundish, a long nozzle and a sliding plate which are actually measured, and according to a similar proportion of 1/3, organic glass is adopted to manufacture a steel ladle model 1, a tundish model 2, a long nozzle model 3 and a sliding plate device 4, wherein the tundish model 2 is a single-flow tundish; and each component is installed according to the position relation.
The drainage sand simulant is divided into a particle simulant 7 and an adhesive layer 9, wherein the particle simulant 7 adopts hollow glass particles with the particle size ranging from dozens of micrometers to hundreds of micrometers; the bonding layer 9 is made of rock sugar; the filtering and collecting device 6 is a porous filtering structure and is arranged below the liquid outlet 21.
The test method adopting the device comprises the following steps:
(1) closing the sliding plate device 4, filling 1.6kg of hollow glass particles into the outlet of the ladle model 1, stacking according to the stacking mode of the drainage sand in actual production, pouring the melted ice sugar above the hollow glass particle pile after stacking is finished, and cooling to bond the upper part of the hollow glass particle pile into a shell;
(2) adding hot water into the tundish model 2 to a position of 300mm of a stable pouring liquid level, starting a heating device 5 in the tundish to maintain the temperature of the water in the tundish within the temperature range of 30-35 ℃, and monitoring the temperature of the water in the tundish model 2 by using a temperature monitoring device;
(3) after the water temperature in the tundish model 2 is relatively stable, opening the liquid outlet 21 to enable water to flow out at the flow rate of 3.0L/min; simultaneously, quickly adding hot water into the ladle model 1 and then quickly opening the sliding plate device 4, wherein the temperature of the hot water added into the ladle model 1 is higher than the water temperature in the tundish model 2, and is specifically 40 ℃;
(4) the hollow glass particles and the rock sugar bonding layer are immediately flushed into the tundish model 2 by hot water in the ladle model 1, and the opening degree of the sliding plate device 4 is gradually adjusted, so that the water level in the tundish model is maintained at a stable pouring liquid level of 300 mm.
(5) After pouring for 15 minutes, respectively collecting the hollow glass particles at the liquid outlet 21 and the top liquid level of the tundish model 2 and weighing the hollow glass particles to calculate the proportion of the hollow glass particles in the total weight, namely the outflow rate and the removal rate.
(6) By adjusting parameters such as flow control devices (such as turbulence suppressors and retaining wall positions) in the tundish model, the outlet flow rate of the tundish model, the opening mode of the sliding plate device and the like, the optimal tundish structure and process control parameters which are beneficial to preventing the drainage sand from flowing out of the tundish outlet can be fitted and obtained.
Example 2: according to the structures and the sizes of a steel ladle, a tundish, a long nozzle and a sliding plate which are actually measured, and according to a similar proportion of 1/2, organic glass is adopted to manufacture a steel ladle model 1, a tundish model 2, a long nozzle model 3 and a sliding plate device 4, wherein the tundish model 2 is a single-flow tundish; and each component is installed according to the position relation.
The drainage sand simulant is divided into a particle simulant 7 and an adhesive layer 9, wherein the particle simulant 7 adopts hollow glass particles with the particle size ranging from dozens of micrometers to hundreds of micrometers; the bonding layer 9 is made of solid glue; the filtering and collecting device 6 is a porous filtering structure and is arranged below the liquid outlet 21.
The test method adopting the device comprises the following steps:
(1) closing the sliding plate device 4, filling 2.5kg of hollow glass particles into an outlet of the ladle model 1, stacking according to a stacking mode of the drainage sand in actual production, pouring molten solid glue above the hollow glass particle pile after stacking is finished, and cooling to bond the upper part of the hollow glass particle pile into a shell;
(2) adding hot water into the tundish model 2 to a position of 320mm of a stable pouring liquid level, starting a heating device 5 in the tundish to maintain the water temperature in the tundish within the temperature range of 28-32 ℃, and monitoring the water temperature in the tundish model 2 by using a temperature monitoring device;
(3) after the water temperature in the tundish model 2 is relatively stable, opening the liquid outlet 21 to enable water to flow out at the flow rate of 4.0L/min; simultaneously, quickly adding hot water into the ladle model 1 and then quickly opening the sliding plate device 4, wherein the temperature of the hot water added into the ladle model 1 is higher than the water temperature in the tundish model 2, and is specifically 38 ℃;
(4) the hollow glass particles and the solid glue bonding layer are immediately flushed into the tundish model 2 by hot water in the ladle model 1, and the opening degree of the sliding plate device 4 is gradually adjusted, so that the water level in the tundish model is maintained at a stable pouring liquid level of 320 mm.
(5) After pouring for 15 minutes, respectively collecting the hollow glass particles at the liquid outlet 21 and the top liquid level of the tundish model 2 and weighing the hollow glass particles to calculate the proportion of the hollow glass particles in the total weight, namely the outflow rate and the removal rate.
(6) By adjusting parameters such as flow control devices (such as turbulence suppressors and retaining wall positions) in the tundish model, the outlet flow rate of the tundish model, the opening mode of the sliding plate device and the like, the optimal tundish structure and process control parameters which are beneficial to preventing the drainage sand from flowing out of the tundish outlet can be fitted and obtained.
Claims (7)
1. A simulation test device for a molten steel pouring process is characterized by comprising a ladle model (1), a tundish model (2), a long nozzle model (3) and a sliding plate device (4) which are formed by reducing in the same proportion according to a similar principle; the ladle model (1) is arranged above the tundish model (2), the sliding plate device (4) is arranged at the bottom of an outlet of the ladle model (1), and the long nozzle model (3) is arranged below the sliding plate device (4) and extends into the tundish model (2); a heating device (5) is arranged in the tundish model (2), the tundish model (2) is provided with at least one liquid outlet (21), and the liquid outlet (21) is correspondingly provided with a filtering and collecting device (6);
the ladle filler sand simulation device is characterized by further comprising a drainage sand simulator and a temperature monitoring device (8), wherein the temperature monitoring device (8) is used for monitoring the liquid temperature in the ladle model (1) and the tundish model (2).
2. The molten steel casting process simulation test apparatus according to claim 1, wherein the slide plate means (4) is constructed in a slide-open and-close valve structure for opening and closing an outlet of the ladle model (1) and controlling an opening degree.
3. The molten steel casting process simulation test device according to claim 2, wherein the drainage sand simulant is accumulated at the outlet of the ladle model (1) when the slide plate device (4) is in a closed state.
4. The molten steel pouring process simulation test device according to claim 3, wherein the flow guiding sand simulator comprises a particle simulator (7) and a bonding layer (9), and the bonding layer (9) is covered above the particle simulator (7).
5. The molten steel pouring process simulation test device according to claim 1, wherein a flow control device is further arranged in the tundish model (2), and the flow control device comprises at least one of a turbulence suppressor (10) and a retaining wall.
6. The molten steel pouring process simulation test device according to claim 1, wherein the ladle model (1), the tundish model (2), the long nozzle model (3) and the sliding plate device (4) are made of organic glass.
7. The simulation test device for the molten steel pouring process according to claim 4, wherein the particle simulant (7) is hollow glass particles having a particle size distribution from micron level to hundred micron level and a density less than that of water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020958430.5U CN212526043U (en) | 2020-05-29 | 2020-05-29 | Simulation test device for molten steel pouring process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111496239A (en) * | 2020-05-29 | 2020-08-07 | 南京钢铁股份有限公司 | Simulation test device and test method for molten steel pouring process |
| CN113295293A (en) * | 2021-04-12 | 2021-08-24 | 芜湖泓鹄材料技术有限公司 | Method for designing position of inner pouring gate of pouring system by detecting dynamic change of molten iron |
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2020
- 2020-05-29 CN CN202020958430.5U patent/CN212526043U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111496239A (en) * | 2020-05-29 | 2020-08-07 | 南京钢铁股份有限公司 | Simulation test device and test method for molten steel pouring process |
| CN113295293A (en) * | 2021-04-12 | 2021-08-24 | 芜湖泓鹄材料技术有限公司 | Method for designing position of inner pouring gate of pouring system by detecting dynamic change of molten iron |
| CN113295293B (en) * | 2021-04-12 | 2022-06-21 | 芜湖泓鹄材料技术有限公司 | Method for designing position of inner pouring gate of pouring system by detecting dynamic change of molten iron |
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