CN109732074B - Ladle dispersion ring ventilation upper nozzle pocket brick and argon blowing metallurgical method thereof - Google Patents
Ladle dispersion ring ventilation upper nozzle pocket brick and argon blowing metallurgical method thereof Download PDFInfo
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- CN109732074B CN109732074B CN201910126691.2A CN201910126691A CN109732074B CN 109732074 B CN109732074 B CN 109732074B CN 201910126691 A CN201910126691 A CN 201910126691A CN 109732074 B CN109732074 B CN 109732074B
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Abstract
The invention relates to a ladle ventilation upper nozzle pocket block, which comprises an upper nozzle pocket block body, a dispersion ventilation ring, an air chamber box and an air inlet pipe, wherein a steel flow hole, a connecting hole and an upper nozzle mounting hole which penetrate up and down are formed in the middle of the ladle upper nozzle pocket block body, argon is blown in the whole process in the continuous casting ladle pouring process, according to the change of the net weight of molten steel in the ladle, the argon is automatically regulated to form tiny argon bubbles through the dispersion ventilation ring, most of the argon bubbles move upwards, an annular air curtain barrier is formed around the ladle upper nozzle, air washing is carried out on the molten steel which is about to enter the ladle upper nozzle, stable and continuous annular air flow is formed in the upper nozzle, the upper nozzle is restrained from nodulation, and ladle slag caused by confluence vortex and drainage sink is effectively restrained in the later stage of ladle pouring.
Description
Technical Field
The invention relates to a ladle dispersion ring ventilation upper nozzle pocket block and an argon blowing metallurgical method thereof, belonging to the technical field of steelmaking technology in ferrous metallurgy.
Background
Molten steel cleanliness and castability are important points and difficulties in controlling the steel making process, and in continuous casting production, after slag in a ladle flows into a tundish, burning loss of easily oxidized alloy elements such as aluminum, titanium and the like in the molten steel can be caused, aluminum oxide inclusion is generated, the molten steel cleanliness is influenced, and the surface quality problem of steel is easily caused. The ladle slag discharge amount is generally reduced by using a ladle slag discharge detection technology, namely, a water gap is closed and casting is stopped when the ladle slag discharge is detected in the later stage of ladle casting, but the following problems are found in the actual production process: (1) The molten steel in the ladle has more casting allowance, and the consumption and cost of steel materials are increased; (2) Although the ladle slag discharging amount can be reduced to a certain extent, the metallurgical function of removing impurities in molten steel and purifying the molten steel is not achieved.
Chinese patent document CN201455253U (patent number 200920016943.8) discloses a novel ladle nozzle pocket brick used in the steelmaking production process, which is of a cylindrical structure and consists of an upper truncated cone, a middle cylinder and a lower truncated cone, wherein the diameter D1 of the channel inlet of the upper truncated cone is 150-240 mm, and the diameter D2 of the channel of the cylinder connected with the lower part is 80-100 mm. The height L1 of the upper truncated cone is 80-200 mm. This patent suffers from the following disadvantages: the nozzle pocket brick has no ventilation element, has no function of removing impurities and purifying molten steel, can not inhibit slag rolling of the nozzle of the molten steel tank, and has a large molten steel pouring quantity.
Chinese patent document CN104028739B (patent number: 201410274221.8) discloses a ladle ventilation water-feeding mouth pocket brick and a method for controlling ladle slag discharging by the ladle ventilation water-feeding mouth pocket brick, the ladle ventilation water-feeding mouth pocket brick comprises a water-feeding mouth pocket brick body, ventilation ceramic rods, an air chamber box and an air inlet pipe, wherein a steel flow hole and a water-feeding mouth mounting hole are formed in the middle of the water-feeding mouth pocket brick body from top to bottom, the inside of the water-feeding mouth pocket brick body is provided with annular ventilation ceramic rods and annular air chamber boxes which are uniformly arranged in a circular shape, the bottom of the air chamber box is connected with the air inlet pipe, argon is blown in from the air inlet pipe when molten steel in the ladle is at a low liquid level, and the problem of vortex slag rolling of the water-feeding mouth of the ladle is controlled. The patent is mainly aimed at inhibiting the slag rolling problem of a ladle nozzle at the end of ladle pouring. This patent suffers from the following disadvantages: argon bubbles formed by the argon passing through the permeable ceramic are large and have small concentration, and argon is blown only at the end of ladle pouring, so that the metallurgical function of removing impurities by blowing argon in the whole process is not realized.
Chinese patent documents CN108273987a (patent application number: 201810309436.7) and CN208146911U (patent application number: 201820491055.0) disclose a ladle gas-permeable nozzle pocket brick and a method for controlling ladle slag tapping thereof, the apparatus comprising a ladle nozzle pocket brick body, a gas-permeable plug, a gas chamber box, a gas-permeable plug base, an argon blowing channel, a steel flow hole and a nozzle mounting hole, and an argon blowing control method: when the height of molten steel in the ladle is: ladle height = 1: and (16-35) blowing inert gas into the molten steel through a blowing channel to inhibit ladle slag from being discharged due to confluence vortex and drainage sink. The patent mainly aims at solving the problem of ladle slag discharging caused by restraining confluence vortex and drainage pit at the end of ladle pouring. This patent suffers from the following disadvantages: the number of the ventilation plugs is 2 or 4, a continuous and dense argon bubble annular air curtain barrier cannot be formed around the ladle upper nozzle, the effect of restraining the confluence vortex is limited, and inert gas is only blown in at the end of ladle pouring, so that the metallurgical functions of blowing argon in the whole process and promoting floating and removal of inclusions are avoided; under the condition that the molten steel surface in the steel ladle continuously decreases, the argon blowing flow is not automatically adjusted linearly, so that the problem of slag coiling of the molten steel caused by blowing the molten steel slag surface is caused.
Disclosure of Invention
According to the invention, argon is blown into the whole course in the casting process of a continuous casting ladle, according to the change of the net weight of molten steel in the ladle (the molten steel surface in the ladle), argon flow is automatically regulated, micro argon bubbles are formed by the argon through the dispersive air-permeable ring, most of the argon bubbles move upwards, an annular air curtain barrier is formed around the ladle upper nozzle, the molten steel to be introduced into the ladle upper nozzle is air-washed, floating and removal of inclusions are promoted, a certain amount of argon bubbles enter the upper nozzle along with steel flow, stable and continuous annular air flow is formed in the upper nozzle, the nodulation problem of the upper nozzle is restrained, and ladle slag tapping caused by confluence vortex and drainage sink is effectively restrained, and meanwhile, the problem of molten steel slag rolling caused by the fact that the argon blowing flow is not timely regulated and the slag surface of molten steel is broken is solved under the condition that the molten steel surface in the ladle is continuously reduced, and the electrolytic steel pouring weight of the electrolytic steel is reduced by more than 36% than that of a casting sample in the comparative example CN201455253U (the patent number 200920016943.8) is reduced.
The utility model provides a ladle dispersion ring ventilative mouth of a river brick cup, includes ladle upper mouth of a river brick cup body (1), dispersion type ventilative ring (2), air chamber (3), and the middle part of ladle upper mouth of a river brick cup body (1) is provided with flow steel hole (5), connecting hole (6), the upper mouth of a river mounting hole (7) that run through from top to bottom, ladle upper mouth of a river brick cup body (1) in top-down be provided with dispersion type ventilative ring (2) and air chamber (3), the upper surface of mouth of a river brick cup body (1) is stretched out on the upper portion of dispersion type ventilative ring, air chamber (3) set up in the bottom of dispersion type ventilative ring, the lateral part of air chamber (3) is connected with intake pipe (4), the one end and the air chamber intercommunication of intake pipe, the lateral part of the other end follow air curtain barricade body (1) stretches out. In the continuous casting ladle pouring process, the gas-permeable upper nozzle pocket brick of the ladle dispersion ring blows argon in the whole process, and has three argon blowing metallurgical functions of purifying molten steel in the ladle, inhibiting the upper nozzle nodulation of the ladle, inhibiting the pouring slag of the ladle and the like.
Preferably, the air chamber (3) is formed at the bottom of the dispersion type ventilation ring through embedding the tire mold.
Preferably, the ladle upper nozzle pocket brick body (1) is formed by casting corundum castable, and the volume density is more than or equal to 3.0g/cm 3 The high-temperature flexural strength is more than or equal to 12Mpa, the high-temperature compressive strength is more than or equal to 80Mpa, and AL is the same as that of the alloy 2 O 3 The content is more than or equal to 92 percent, cr 2 O 3 The content is more than or equal to 2 percent.
In the invention, the cross section of the dispersion type ventilation ring (2) is in a circular shape, the longitudinal section of the dispersion type ventilation ring is in a right trapezoid shape, the width x of the lower part of the circular ring is 50-60 mm, the width y of the upper part of the dispersion type ventilation ring is 46-56 mm, and the height h of the dispersion type ventilation ring is 120-220 mm.
The dispersive ventilation ring (2) is produced by adopting an isostatic compaction process by taking high-purity corundum, mullite and the like as main raw materials, and the volume density is more than or equal to 2.80g/cm 3 The air holes in the dispersion ring are uniformly and dispersedly distributed, argon gas permeates the dispersion type air permeable ring to form continuous and uniformly distributed tiny argon bubbles (the diameter of the bubbles is smaller than 1mm measured by a water mold experiment), the dispersion type air permeable ring is superior to the dispersion type air permeable ring produced by the traditional machine press molding, the quality defects of uneven air permeability, small volume density and the like of the dispersion type air permeable ring produced by the traditional machine press molding are overcome, the air permeable plug described in the Chinese patent document CN108273987A (patent application number: 201810309436.7) is superior to the air permeable plug which is easy to block, the technical difficulty of easy blocking of the slit type air permeable plug is overcome, the air permeable ceramic rod described in the Chinese patent document CN104028739B (patent number: 201410274221.8) is overcome, the performance defects of large diameter, small density and the like of the argon bubbles formed by the argon gas permeating the air permeable ceramic rod are overcome, and the casting allowance ratio of molten steel in a ladle is reduced by more than 19% compared with the casting allowance ratio of the steel ladle of the comparative example CN104028739B (patent number: 201410274221.8) by more than 23% of the electrolytic inclusion weight ratio of a continuous casting blank sample.
The isostatic compaction process is characterized in that a sample to be compacted is placed in a high-pressure container, the sample is uniformly pressurized from all directions by utilizing the incompressible property and the uniform pressure transmission property of a liquid medium, and when the liquid medium is injected into the pressure container through a pressure pump, the pressure intensity of the liquid medium is unchanged and uniformly transmitted to all directions according to the fluid mechanics principle. The powder in the high-pressure container is subjected to uniform and uniform pressure in all directions. The process of shaping the barren powder into a dense green body by the above process is referred to as isostatic pressing. The isostatic pressing process adopts the prior art.
In the invention, preferably, the height Z of the upper end of the dispersion type air permeable ring (2) extending out of the upper surface of the ladle upper nozzle pocket block body (1) is 5-10 mm.
In the invention, the whole air chamber (3) is in a circular shape, the diameter phi of the central circle of the circular ring is 300-330 mm, the longitudinal section of the air chamber is semicircular, the radius R of the air chamber is 9-10 mm, the air chamber (3) is provided with an air inlet pipe mounting hole (8), and the diameter d of the air inlet pipe mounting hole is 12-13 mm. Preferably, the diameter d of the intake pipe mounting hole is 12mm. The air inlet pipe mounting hole (8) is used for mounting the air inlet pipe (4).
Preferably, the longitudinal center lines of the steel flow hole (5), the connecting hole (6) and the upper nozzle mounting hole (7) are in the same straight line with the longitudinal center line of the ladle upper nozzle pocket brick body (1), the steel flow hole (5) is in a truncated cone shape, the diameter d1 of the upper port of the truncated cone is 190-210 mm, the diameter d2 of the lower port of the truncated cone is 140-160 mm, the height c of the truncated cone is 55-80 mm, the connecting hole (6) is a cylindrical channel, the diameter of the cylindrical channel is consistent with the diameter of the lower port of the truncated cone, and the cylindrical height b is 250-270 mm.
In the invention, preferably, the upper part of the upper water gap mounting hole (7) is in a truncated cone shape, the diameter of the upper port of the truncated cone is consistent with the diameter of the port of the connecting hole (6), and the diameter d3 of the lower port of the truncated cone is 170-190 mm. And the matching size of the upper nozzle mounting hole is designed according to the outline size of the upper nozzle.
Preferably, the ladle upper nozzle pocket block body (1) has a cylindrical shape, the outer diameter D of the cylindrical shape is 400-430 mm, and the height H of the cylindrical shape is 460-470 mm.
The air inlet pipe (4) and the air inlet connecting metal pipe (9) are made of heat-resistant stainless steel round pipes, wherein the specification size of the air inlet pipe (4) is M1X1.25 (internal thread of a nut, large diameter 11mm and screw pitch 1.25 mm), and the specification size of the air inlet connecting metal pipe (9) is phi 10 multiplied by 2 (the external diameter is 10mm and the wall thickness is 2 mm).
The invention relates to a dispersion type ventilation ring of a ladle dispersion ring ventilation upper nozzle pocket brick, which is produced by adopting an isostatic pressing process, wherein the width x of the lower part of the ring is 50-60 mm, the width y of the upper part of the ring is 46-56 mm, the height h of the ring is 120-220 mm, the height Z of the upper end of the dispersion type ventilation ring, which extends out of the upper surface of a ladle upper nozzle pocket brick body, is 5-10 mm, and the appearance of the ladle upper nozzle pocket brick body is designed in a cylindrical shape and the like, and is based on the task of the invention: the method has the advantages that the ventilation uniformity and the argon bubble concentration of the dispersion type ventilation ring are improved, the capability of capturing and removing impurities of the argon bubbles is improved, the nodulation of a water gap on a steel ladle is restrained, the slag falling of the steel ladle caused by confluence vortex and drainage sink is restrained, the positioning of the dispersion type ventilation ring is accurate, the specific selection of the dispersion type ventilation ring and the service life of a body are realized, the dispersion type ventilation ring is obtained through a large number of water model experimental researches and production experiments by a person in the field, the dispersion type ventilation ring is produced by adopting an isostatic pressing process, the quality defects of uneven ventilation property, small volume density and the like of the dispersion type ventilation ring produced by the existing machine press forming are overcome, the argon gas permeates the dispersion type ventilation ring to form continuous and dense tiny argon bubbles, most of the argon bubbles move upwards to form an annular air curtain barrier around the water gap on the steel ladle, the molten steel which is about to enter the water gap on the steel ladle, the floating up and removing of the impurities are promoted, a certain amount of the argon bubbles enter the water gap along with the steel flow, stable and continuous annular air flow is formed in the water gap, the water gap nodulation problem is restrained, after the steel ladle pouring sink is effectively restrained, the molten steel slag falling in the water gap is reduced, and the molten steel is not guaranteed to be clean; the width design of the dispersion type ventilation ring is set according to comprehensive study and setting of the inclusion removal effect of the ventilation ring with different widths, the water model experiment research result of the critical height for generating vortex, the positioning space size requirement and the molding quality requirement, and the height design of the dispersion type ventilation ring is set based on the erosion residual thickness dimension of the ladle lower line small repair measuring ladle upper nozzle pocket brick body and the dispersion type ventilation ring so as to ensure the service life synchronization of the dispersion type ventilation ring, the ladle upper nozzle pocket brick body and the ladle slag line working lining; the upper end of the dispersion type ventilation ring extends out of the upper surface of the ladle upper nozzle pocket brick body, so that the positioning difficulty of the dispersion type ventilation ring in the casting production of the ladle dispersion type ventilation ring ventilation upper nozzle pocket brick is solved; the appearance of ladle upper nozzle pocket block body is cylindrical by traditional square design for the wall thickness of ladle ventilative upper nozzle pocket block body is even, has reduced the crack problem that the thermal stress inequality arouses, has prolonged the life of ladle diffuse type ventilative ring ventilative upper nozzle pocket block.
The invention relates to the installation of a ladle dispersion ring ventilation upper nozzle pocket block, which is installed in a ladle upper nozzle pocket block installation pit (11) by adopting the prior art, one end of an air inlet connection metal pipe (9) is connected with an air inlet pipe (4), the other end of the air inlet connection metal pipe penetrates out from the ladle bottom of a ladle cladding (10), and after a ladle seat is arranged on a ladle turret of a continuous casting machine, the air inlet connection metal pipe (9) is communicated with an argon gas source.
The invention also provides an argon blowing metallurgical device using the ladle dispersion ring ventilation water inlet pocket brick, which is characterized in that a set of argon pipeline system and an electrical control system are arranged on argon flow control, a weighing signal of molten steel in a ladle is introduced, and the argon flow is linearly regulated according to the change of the net weight of the molten steel in the ladle, so that the problem of molten steel slag coiling caused by untimely regulation of the argon blowing flow and blowing of the slag surface of the molten steel under the condition that the liquid level of the molten steel in the ladle is continuously reduced is solved.
The argon gas pipeline system is divided into a main blowing branch and a manual bypass as shown in fig. 5, wherein the main blowing branch sequentially comprises a first ball valve 15a, a gas filter 16, a first pressure gauge 17a, a second ball valve 15b, a pressure transmitter 18, an electromagnetic valve 19, a mass flow controller 20 special for metallurgy, a one-way valve 21, a second pressure gauge 17b, a pressure reducing valve 22 and a third ball valve 15c; the manual bypass sequentially comprises a fourth ball valve 15d and a manual regulating valve 23, the front end of the manual bypass is arranged between the first pressure gauge 17a and the second ball valve 15b, the tail end of the manual bypass is arranged between the one-way valve 21 and the second pressure gauge 17b, and the manual bypass is connected with the second ball valve 15b of the main blowing branch, the pressure transmitter 18, the electromagnetic valve 19, the special metallurgical mass flow controller 20 and the one-way valve 21 in parallel; the automatic pressure compensation device is used for manual operation application after a main blowing branch breaks down, an argon pipeline system is positioned in a control cabinet, and a pressure transmitter 18 and a pressure reducing valve 22 in the argon pipeline system have the functions of mechanical and electronic double pressure automatic compensation, the inlet pressure fluctuates randomly, the outlet pressure is self-adaptive, and the influence of back pressure disturbance is avoided.
The electric control system comprises a network switch, an argon blowing control system PLC, a touch screen, an upper computer operating system and a continuous casting basic automation system, wherein the argon blowing control system PLC and the touch screen are arranged in a control box, the argon blowing control system PLC, the touch screen, the upper computer operating system and the continuous casting basic automation system are all connected with the network switch through Ethernet communication, and a molten steel weighing system in a steel ladle collects and sends molten steel weight in the steel ladle to the continuous casting basic automation system and uploads the molten steel weight to the argon blowing control system PLC through the Ethernet communication and the network switch, as shown in fig. 6. Those skilled in the art may choose from actual needs or use prior art control systems.
The argon blowing control system PLC collects the pressure value of the first pressure gauge (17 a), the flow value of the special metallurgical mass flow controller (20), the pressure value of the second pressure gauge (17 b) and the weight value of molten steel in the ladle, executes an argon flow automatic control instruction of the argon blowing control system PLC, and automatically adjusts the argon flow according to the change of the net weight of molten steel in the ladle.
The invention also provides an argon blowing metallurgical method for the gas-permeable upper nozzle pocket brick by using the ladle dispersion ring, which comprises the following steps:
firstly, receiving a ladle pouring start signal by an argon blowing control system PLC, and starting to blow argon, wherein the initial argon flow is set to be the argon blowing flow determined by soft blowing of the ladle, and is generally 50-100NL/min;
in the second step, in the ladle pouring process, according to the change of the net weight of molten steel in the ladle, the argon flow is linearly regulated, and the set value of the argon flow in the process = the net weight of the residual molten steel in the ladle/(the net weight of molten steel when the ladle is full/(the initial argon flow when the ladle is full);
thirdly, judging that the ladle is in slag discharging or a slag discharging detection system alarms, and receiving a ladle stop signal, and stopping blowing argon into the gas-permeable upper nozzle pocket brick of the ladle dispersion ring.
The beneficial effects of the invention are as follows:
1) According to the invention, a dispersion type permeable ring is arranged in a ladle upper nozzle pocket brick body, a set of argon pipeline system and an electrical control system are arranged on argon flow control, argon is blown in the whole process of casting a continuous casting ladle, according to the change of the net weight of molten steel in the ladle, the argon flow is automatically regulated, tiny argon bubbles are formed by the argon through the dispersion type permeable ring, most of the argon bubbles move upwards, an annular air curtain barrier is formed around the ladle upper nozzle, the molten steel which is about to enter the ladle upper nozzle is subjected to air washing, the floating and removal of inclusions are promoted, a certain amount of argon bubbles enter the upper nozzle along with the molten steel flow, a stable and continuous annular air flow is formed in the upper nozzle, the problem of nodulation of the upper nozzle is effectively inhibited, and ladle slag tapping caused by confluence vortex and drainage sink is effectively inhibited in the later stage of ladle casting, and meanwhile, the problem of molten steel slag rolling caused by untimely regulation of the argon blowing flow in the ladle slag surface is solved, and the cleanliness of the molten steel ladle is improved by the application of the invention, and the molten steel slag pouring quantity in the ladle is reduced compared with the application of the method of the invention in a comparative example of CN201455253U (patent number: 200920016943.8) the molten steel pouring quantity in the ladle is reduced by more than 36%, and the electrolytic inclusion weight of the continuous casting billet sample is reduced by more than 35%.
2) The dispersive ventilation ring provided by the invention has the height h of 120-220 mm, is produced by adopting an isostatic compaction process by taking high-purity corundum, mullite and the like as main raw materials, and has the volume density of more than or equal to 2.80g/cm 3 The ventilation holes in the dispersion ring are uniformly and dispersedly distributed, argon gas permeates the dispersion ventilation ring to form continuous and uniformly distributed tiny argon bubbles (the diameter of the bubbles is smaller than 1mm measured by a water model experiment), which is superior to the dispersion ventilation ring produced by mechanical compression molding in China patent document CN107225231A (patent number 201710575311.4), the quality defects of uneven ventilation, small volume density and the like of the dispersion ventilation ring produced by mechanical compression molding are overcome, the ventilation plug is superior to the ventilation plug in China patent document CN108273987A (patent application number 201810309436.7), the technical difficulty that the slit type ventilation plug is easy to block is overcome, the ventilation ceramic rod is superior to the ventilation ceramic rod in China patent document CN104028739B (patent number 201410274221.8), and the argon bubble density and the like formed by the argon gas permeating the ventilation ceramic rod are overcomeThe performance is insufficient, so that the invention further improves the argon blowing metallurgical effect of micro argon bubbles driving impurities to float upwards and remove and the functional effect of inhibiting ladle slag discharge caused by confluence vortex and drainage sink, and compared with the ladle adopting comparative example CN104028739B (patent number: 201410274221.8), the invention has the advantages that the molten steel pouring allowance is reduced by more than 22%, and the electrolytic impurities weight of the continuous casting billet sample is reduced by more than 23%.
3) The appearance of the ladle upper nozzle pocket brick body is cylindrical in traditional square design, so that the wall thickness of the ladle upper nozzle pocket brick body is uniform, firstly, the problem of cracks caused by uneven thermal stress is reduced, the service life of the ladle dispersion type air ring air upper nozzle pocket brick body is prolonged, secondly, the volume and the single weight are reduced by 21.5% in a same ratio, and the raw material cost of the ladle upper nozzle pocket brick body is reduced by 21.5% in a same ratio.
Drawings
Fig. 1 is a front view of a ladle shroud permeable nozzle pocket block structure in an embodiment of the invention.
Fig. 2 is a top view of a ladle dispersion ring ventilation upper nozzle pocket block structure in an embodiment of the invention.
FIG. 3 is a schematic view of a structure of a plenum box according to an embodiment of the invention.
Fig. 4 is a schematic diagram of installation of a steel ladle dispersion ring ventilation upper nozzle pocket block in an embodiment of the invention.
FIG. 5 is a schematic diagram of an argon piping system in an embodiment of the invention.
Fig. 6 is a schematic diagram of electrical connection in an embodiment of the present invention.
In the figure, 1, a ladle dispersion ring ventilation upper nozzle pocket block body; 2. a diffusion-type ventilation ring; 3. an air chamber box; 4. an air inlet pipe; 5. a steel flow hole; 6. a connection hole; 7. a water inlet mounting hole; 8. an air inlet pipe mounting hole; 9. the air inlet is connected with the metal pipe; 10. ladle cladding; 11. a pit is arranged on a ladle upper nozzle pocket block; 12. a ladle permanent lining; 13. ladle working lining 14, ladle slag line brick; 15. ball valves (including a first ball valve 15a, a second ball valve 15b, a third ball valve 15c, a fourth ball valve 15 d); 16. a gas filter; 17. pressure gauges (including a first pressure gauge 17a, a first pressure gauge 17 b); 18. a pressure transmitter; 19. an electromagnetic valve; 20. a mass flow controller dedicated to metallurgy; 21. a one-way valve; 22. a pressure reducing valve; 23. and a manual adjusting valve.
Detailed Description
The invention is further illustrated, but not limited to, by the following examples and figures.
Example 1
The steel ladle dispersion ring ventilation upper nozzle pocket brick comprises a steel ladle upper nozzle pocket brick body 1, a dispersion ventilation ring 2, an air chamber 3 and an air inlet pipe 4, wherein a steel flow hole 5, a connecting hole 6 and an upper nozzle mounting hole 7 which vertically penetrate are formed in the middle of the steel ladle upper nozzle pocket brick body, the dispersion ventilation ring 2 and the air chamber 3 are formed in the steel ladle upper nozzle pocket brick body 1 from top to bottom, the upper part of the dispersion ventilation ring extends out of the upper surface of the water nozzle pocket brick body 1, the air chamber 3 is formed at the bottom of the dispersion ventilation ring through a buried moulding bed in one step, one end of the air inlet pipe is communicated with the air chamber, and the other end of the air inlet pipe extends out of the side of the air curtain wall body 1.
The dispersive ventilation ring 2 is produced by adopting an isostatic compaction process by taking high-purity corundum, mullite and the like as main raw materials, and has the volume density of 2.85g/cm 3 The air holes in the dispersion ring are uniformly and dispersedly distributed, argon gas permeates the dispersion type air permeable ring to form continuous and uniformly distributed tiny argon bubbles (the diameter of the bubbles is smaller than 1mm measured by a water model experiment), which is superior to the dispersion type air permeable ring produced by the traditional machine press molding, the quality defects of uneven air permeability, small volume density and the like of the dispersion type air permeable ring produced by the traditional machine press molding are overcome, the air permeable plug described in the Chinese patent document CN108273987A (patent application number: 201810309436.7) is superior to the air permeable plug described in the Chinese patent document CN104028739B (patent number: 201410274221.8), the technical difficulty that the slit type air permeable plug is easy to block is overcome, the performance defect that the argon gas permeates the air permeable ceramic rod to form small argon bubble density and the like is overcome, and the invention further improves the driving of the tiny argon bubblesAnd the inclusion floats upwards and is removed, and the argon blowing metallurgical effect is achieved.
The ladle upper nozzle pocket brick body 1 is formed by casting corundum castable, and the volume density is more than or equal to 3.0g/cm 3 The high-temperature flexural strength is more than or equal to 12Mpa, the high-temperature compressive strength is more than or equal to 80Mpa, and AL is the same as that of the alloy 2 O 3 The content is more than or equal to 92 percent, cr 2 O 3 The content is more than or equal to 2 percent.
The cross section of the dispersion type ventilation ring 2 is in a circular ring shape, the longitudinal section of the dispersion type ventilation ring is in a right trapezoid shape, the width x of the lower part of the circular ring is 52mm, the width y of the upper part of the circular ring is 48mm, and the height h of the circular ring is 200mm.
The whole air chamber 3 is annular, the diameter phi of the center circle of the annular ring is 320mm, the longitudinal section of the air chamber is semicircular, the radius R of the air chamber is 9.6mm, the air chamber 3 is provided with an air inlet pipe mounting hole 8, and the diameter d of the air inlet pipe mounting hole is 12mm.
The height Z of the upper end of the dispersion type ventilation ring 2 extending out of the upper surface of the ladle upper nozzle pocket block body 1 is 7mm.
The longitudinal center lines of the steel flow hole 5, the connecting hole 6 and the upper water gap mounting hole 7 are in the same straight line with the longitudinal center line of the ladle upper water gap pocket brick body 1, the steel flow hole 5 is in the shape of a circular truncated cone, the diameter d1 of the upper port of the circular truncated cone is 200mm, the diameter d2 of the lower port of the circular truncated cone is 152mm, the height c of the circular truncated cone is 60mm, the connecting hole is a cylindrical channel, the diameter of the cylindrical channel is consistent with the diameter of the lower port of the circular truncated cone, and the cylindrical height b is 263mm.
The upper part of the upper water gap mounting hole 7 is in a truncated cone shape, the diameter of the upper port of the truncated cone is consistent with that of the port of the connecting hole 6, and the diameter d3 of the lower port of the truncated cone is 183mm. And the matching size of the upper nozzle mounting hole is designed according to the outline size of the upper nozzle.
The ladle upper nozzle pocket block body 1 is cylindrical in appearance, the outer diameter D of the cylindrical shape is 410mm, and the height H of the cylindrical shape is 465mm.
The installation of the ladle dispersion ring ventilation water inlet pocket block is shown in fig. 4, and is installed in a ladle water inlet pocket block installation pit 11 by adopting the prior art, one end of an air inlet connection metal pipe 9 is connected with an air inlet pipe 4, the other end of the air inlet connection metal pipe penetrates out from the ladle bottom of a ladle cladding 10, and after the ladle seat is arranged on a ladle turret of a continuous casting machine, the air inlet connection metal pipe 9 is communicated with an argon gas source.
The air inlet pipe 4 and the air inlet connection metal pipe 9 are made of heat-resistant stainless steel round pipes, wherein the specification size of the air inlet pipe 4 is M1X1.25 (internal screw thread of a nut, large diameter 11mm and screw pitch 1.25 mm), and the specification size of the air inlet connection metal pipe 9 is phi 10 multiplied by 2 (the external diameter is 10mm and the wall thickness is 2 mm).
The invention also provides an argon blowing metallurgical method by utilizing the ladle dispersion ring ventilation water-feeding mouth pocket brick, which is characterized in that a set of argon pipeline system and an electrical control system are arranged on argon flow control, a weighing signal of molten steel in a ladle is introduced, and the argon flow is linearly regulated according to the change of the net weight of the molten steel in the ladle, so that the problem of molten steel slag coiling caused by untimely regulation of the argon blowing flow and blowing of the slag surface of the molten steel under the condition that the liquid level of the molten steel in the ladle is continuously reduced is solved.
The argon gas pipeline system is divided into a main blowing branch and a manual bypass, as shown in fig. 5, wherein the main blowing branch comprises a first ball valve 15a, a gas filter 16, a first pressure gauge 17a, a second ball valve 15b, a pressure transmitter 18, a solenoid valve 19, a special mass flow controller 20 for metallurgy, a one-way valve 21, a second pressure gauge 17b, a pressure reducing valve 22 and a third ball valve 15c, the manual bypass comprises a fourth ball valve 15d and a manual regulating valve 23, and the manual bypass is arranged between the first pressure gauge 17a and the second ball valve 15b and is connected in parallel with the second ball valve 15b of the main blowing branch, the pressure transmitter 18, the solenoid valve 19, the special mass flow controller 20 for metallurgy and the one-way valve 21; the automatic pressure compensation device is used for manual operation application after a main blowing branch breaks down, a pipeline element connection relation is achieved, an argon pipeline system is positioned in a control cabinet, a pressure transmitter 18 and a pressure reducing valve 22 in the argon pipeline system have a mechanical and electronic double pressure automatic compensation function, inlet pressure fluctuates randomly, outlet pressure is self-adaptive, and the influence of back pressure disturbance is avoided.
The electric control system comprises an argon blowing control system PLC, a touch screen, an upper computer operating system, a network switch and a continuous casting foundation automation system, wherein each system is connected with the network switch through Ethernet communication, a molten steel weighing system in a ladle collects and sends molten steel weight in the ladle to the continuous casting foundation automation system, and the molten steel weight is uploaded to the argon blowing control system PLC through the Ethernet communication and the network switch, as shown in fig. 6. Those skilled in the art may choose from actual needs or use prior art control systems.
The argon blowing control system PLC collects the pressure value of the first pressure gauge (17 a), the flow value of the special metallurgical mass flow controller (20), the pressure value of the second pressure gauge (17 b) and the weight value of molten steel in the ladle, executes an argon flow automatic control instruction of the argon blowing control system PLC, and automatically adjusts the argon flow according to the change of the net weight of molten steel in the ladle.
The argon flow automatic control instruction of the argon blowing control system PLC is as follows:
firstly, receiving a ladle casting signal, starting argon blowing, wherein the initial argon flow is set to be 100NL/min as the argon blowing flow determined by ladle soft blowing;
in the second step, in the ladle pouring process, according to the change of the net weight of molten steel in the ladle, the argon flow is linearly regulated, and the set value of the argon flow in the process = the net weight of the residual molten steel in the ladle/(the net weight of molten steel when the ladle is full/(the initial argon flow when the ladle is full);
for example, the net weight of molten steel at the time of filling the ladle is 130 tons, and when the net weight of molten steel remaining in the ladle is 65 tons, the process argon flow set value=65++130×100 NL/min=50 NL/min.
Thirdly, manually judging that the ladle is in slag or slag detection system alarm, and receiving a ladle stop signal to stop blowing argon into the gas permeable upper nozzle pocket brick of the ladle dispersion ring.
The argon gas pipeline system components are all purchased in the market, wherein the type specification of the ball valve 15 (comprising a first ball valve 15a, a second ball valve 15b, a third ball valve 15c and a fourth ball valve 15 d) is 304SS-1/2, the type specification of the gas filter 16 is BK110-3, the type specification of the pressure gauge 17 (comprising a first pressure gauge 17a and a first pressure gauge 17 b) is YT40, the type specification of the pressure transmitter 18 is 8323-25-G1/2, the type specification of the electromagnetic valve 19 is 5281-1/2-NBR, the type specification of the metallurgical special mass flow controller 20 is Flox (on) s, the measuring range is 0-200NL/min, the type specification of the pressure reducing valve 22 is BK100-2, and the type specification of the manual regulating valve 23 is 28-1/2-MS.
The electric control system components are all purchased in the market, wherein the model specification of the PLC control system is Siemens S7 series, the model specification of the PLC analog module is 4AI/2AO, the model specification of the touch screen is Siemens 7 inch touch screen, the model specification of the upper computer operating system is D610, and the upper computer software WIN CC is more than 6.0.
Example 2
The ladle shroud gas-permeable nozzle block of example 1 is different in that:
the cross section of the dispersion type ventilation ring 2 is in a circular ring shape, the longitudinal section of the dispersion type ventilation ring is in a right trapezoid shape, the width x of the lower part of the circular ring is 60mm, the width y of the upper part of the circular ring is 56mm, and the height h of the circular ring is 220mm.
The whole air chamber 3 is in a ring shape, the diameter phi of the center circle of the ring is 330mm, the longitudinal section of the air chamber is in a semicircle shape, and the radius R of the air chamber is 10mm.
The height Z of the upper end of the dispersion type ventilation ring 2 extending out of the upper surface of the ladle upper nozzle pocket block body 1 is 10mm.
The steel flow hole 5 is in a circular truncated cone shape, the diameter d1 of an upper port of the circular truncated cone is 210mm, the diameter d2 of a lower port of the circular truncated cone is 160mm, the height c of the circular truncated cone is 78mm, the connecting hole is a cylindrical channel, the diameter of the cylindrical channel is consistent with the diameter of the lower port of the circular truncated cone, and the cylindrical height b is 250mm.
The upper part of the upper water gap mounting hole 7 is in a truncated cone shape, the diameter of the upper port of the truncated cone is consistent with that of the port of the connecting hole 6, and the diameter d3 of the lower port of the truncated cone is 190mm.
The ladle upper nozzle pocket block body 1 is cylindrical in appearance, the outer diameter D of the cylindrical shape is 430mm, and the height H of the cylindrical shape is 470mm.
Example 3
The ladle shroud gas-permeable nozzle block of example 1 is different in that:
the cross section of the dispersion type ventilation ring 2 is in a circular ring shape, the longitudinal section of the dispersion type ventilation ring is in a right trapezoid shape, the width x of the lower part of the circular ring is 50mm, the width y of the upper part of the circular ring is 46mm, and the height h of the circular ring is 120mm.
The whole air chamber 3 is annular, the diameter phi of the central circle of the annular ring is 300mm, the longitudinal section of the air chamber is semicircular, and the radius R of the air chamber is 9mm.
The height Z of the upper end of the dispersion type ventilation ring 2 extending out of the upper surface of the ladle upper nozzle pocket block body 1 is 5mm.
The steel flow hole 5 is in a circular truncated cone shape, the diameter d1 of an upper port of the circular truncated cone is 190mm, the diameter d2 of a lower port of the circular truncated cone is 140mm, the height c of the circular truncated cone is 55mm, the connecting hole is a cylindrical channel, the diameter of the cylindrical channel is consistent with the diameter of the lower port of the circular truncated cone, and the cylindrical height b is 270mm.
The upper part of the upper water gap mounting hole 7 is in a truncated cone shape, the diameter of the upper port of the truncated cone is consistent with that of the port of the connecting hole 6, and the diameter d3 of the lower port of the truncated cone is 170mm.
The appearance of ladle upper nozzle pocket block body 1 is cylindrical, and cylindrical external diameter D is 400mm, and cylindrical height H is 467mm.
The argon flow automatic control instruction of the argon blowing control system PLC is as follows:
firstly, receiving a ladle casting signal, starting argon blowing, wherein the initial argon flow is set to be 50NL/min as the argon blowing flow determined by ladle soft blowing;
in the second step, in the ladle pouring process, according to the change of the net weight of molten steel in the ladle, the argon flow is linearly regulated, and the set value of the argon flow in the process = the net weight of the residual molten steel in the ladle/(the net weight of molten steel when the ladle is full/(the initial argon flow when the ladle is full);
for example, the net weight of molten steel at the time of filling the ladle is 130 tons, and when the net weight of molten steel remaining in the ladle is 13 tons, the process argon flow set value=13++130×50nl/min=5 NL/min.
Thirdly, manually judging that the ladle is in slag or slag detection system alarm, and receiving a ladle stop signal to stop blowing argon into the gas permeable upper nozzle pocket brick of the ladle dispersion ring.
Experimental example
Comparative example 1: chinese patent document CN201455253U (patent No. 200920016943.8) discloses a novel ladle nozzle pocket block used in the steelmaking process.
Comparative example 2: chinese patent document CN104028739B (patent number: 201410274221.8) discloses a ladle ventilation nozzle pocket block and a method for controlling ladle slag tapping.
The ladle dispersion ring air-permeable upper nozzle pocket bricks of the embodiment 1-3 of the invention are compared with ladle nozzle pocket bricks of the comparative embodiment 1-2 in the ladle of a steel mill continuous casting machine for producing ultra-low carbon DC04 grade cold-rolled steel strip and ladle upper nozzle nodulation conditions, a large sample electrolysis sample is respectively taken at 1/4 of a casting blank, a round bar with the diameter of 60mm and the height of 100mm is processed, and large sample electrolysis inclusion detection comparison is carried out, wherein the comparison results are shown in the following table 1.
TABLE 1
Through the data comparison of the table 1, the molten steel pouring allowance in the ladle of the invention is reduced by more than 36% in the same ratio compared with the ladle of the comparative example CN201455253U (patent number: 200920016943.8), the electrolytic inclusion weight of the continuous casting billet sample is reduced by more than 35% in the same ratio, the molten steel pouring allowance in the ladle of the invention is reduced by more than 22% in the same ratio compared with the ladle of the comparative example CN104028739B (patent number: 201410274221.8), the electrolytic inclusion weight of the continuous casting billet sample is reduced by more than 23%, and the production and application results show that the ladle dispersion ring ventilation upper nozzle pocket brick of the invention has three argon blowing metallurgical functions of purifying molten steel in the ladle, inhibiting ladle upper nozzle nodulation, inhibiting ladle pouring slag and the like.
Claims (5)
1. The steel ladle dispersion ring ventilation upper nozzle pocket block is characterized by comprising a steel ladle upper nozzle pocket block body (1), a dispersion ventilation ring (2) and an air chamber (3), wherein a steel flow hole (5), a connecting hole (6) and an upper nozzle mounting hole (7) which vertically penetrate are formed in the middle of the steel ladle upper nozzle pocket block body (1), the dispersion ventilation ring (2) and the air chamber (3) are arranged in the steel ladle upper nozzle pocket block body (1) from top to bottom, the upper part of the dispersion ventilation ring extends out of the upper surface of the water nozzle pocket block body (1), the air chamber (3) is arranged at the bottom of the dispersion ventilation ring, an air inlet pipe (4) is connected to the side part of the air chamber (3), one end of the air inlet pipe is communicated with the air chamber, and the other end of the air inlet pipe extends out of the side part of the upper nozzle pocket block body (1);
the dispersive ventilation ring (2) is produced by adopting an isostatic compaction process by taking high-purity corundum and mullite as main raw materials, and the volume density is more than or equal to 2.80g/cm 3 The ventilation holes in the dispersion ring are uniformly and dispersedly distributed, argon gas penetrates through the dispersion ventilation ring to form continuous and uniformly distributed tiny argon bubbles, and the diameter of the bubbles is smaller than 1mm through water model experiment measurement;
the cross section of the dispersion type ventilation ring (2) is in a circular shape, the longitudinal section of the dispersion type ventilation ring is in a right trapezoid shape, the width x of the lower part of the circular ring is 50-60 mm, the width y of the upper part of the circular ring is 46-56 mm, and the height h of the circular ring is 120-220 mm;
the air chamber (3) is formed at the bottom of the dispersion type ventilation ring through a buried moulding bed at one time;
the appearance of the ladle upper nozzle pocket brick body (1) is cylindrical, the outer diameter D of the cylindrical shape is 400-430 mm, and the height H of the cylindrical shape is 460-470 mm; the height Z of the upper end of the dispersion type air permeable ring (2) extending out of the upper surface of the ladle upper nozzle pocket block body (1) is 5-10 mm.
2. The ladle dispersion ring ventilation water-feeding mouth pocket block according to claim 1, wherein the air chamber (3) is in a circular shape as a whole, the diameter phi of the center circle of the circular ring is 300-330 mm, the longitudinal section of the air chamber is in a semicircle shape, the radius R of the air chamber is 9-10 mm, the air chamber (3) is provided with an air inlet pipe mounting hole (8), and the diameter d of the air inlet pipe mounting hole is 12-13 mm.
3. The ladle shroud air-permeable nozzle block according to claim 2, wherein the diameter d of the air inlet pipe mounting hole is 12mm; the air inlet pipe mounting hole (8) is used for mounting the air inlet pipe (4).
4. The ladle dispersion ring ventilation upper nozzle pocket block according to claim 1, characterized in that the longitudinal center lines of the steel flow hole (5), the connecting hole (6) and the upper nozzle mounting hole (7) are on the same straight line with the longitudinal center line of the ladle upper nozzle pocket block body (1), the steel flow hole (5) is in a round table shape, the diameter d1 of an upper port of the round table is 190-210 mm, the diameter d2 of a lower port is 140-160 mm, the height c of the round table is 55-80 mm, the connecting hole (6) is a cylindrical channel, the diameter of the cylindrical channel is consistent with the diameter of the lower port of the round table, and the cylindrical height b is 250-270 mm;
the upper part of the upper water gap mounting hole (7) is in a truncated cone shape, the diameter of the upper port of the truncated cone is consistent with that of the port of the connecting hole (6), and the diameter d3 of the lower port of the truncated cone is 170-190 mm.
5. An argon blowing metallurgical method using the ladle dispersion ring ventilation upper nozzle pocket brick of any one of claims 1-4, arranging a set of argon pipeline system and an electrical control system on argon flow control, introducing a molten steel weighing signal in the ladle, and linearly adjusting the argon flow according to the change of the net weight of molten steel in the ladle, wherein the method comprises the following steps:
firstly, receiving a ladle pouring start signal by an argon blowing control system PLC, and starting to blow argon, wherein the initial argon flow is set to be the argon blowing flow determined by soft blowing of the ladle, and is generally 50-100NL/min;
in the second step, in the ladle pouring process, according to the change of the net weight of molten steel in the ladle, the argon flow is linearly regulated, and the set value of the argon flow in the process = the net weight of the residual molten steel in the ladle/(the net weight of molten steel when the ladle is full/(the initial argon flow when the ladle is full);
thirdly, judging that the ladle is in slag discharging or a slag discharging detection system alarms, and receiving a ladle stop signal, and stopping blowing argon into the gas-permeable upper nozzle pocket brick of the ladle dispersion ring.
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| CN111822690B (en) * | 2020-07-25 | 2021-12-21 | 莱芜钢铁集团银山型钢有限公司 | Ladle argon blowing upper nozzle pocket brick and preparation method thereof |
| CN111774559B (en) * | 2020-07-25 | 2022-06-28 | 莱芜钢铁集团银山型钢有限公司 | Device for improving blowing-through rate of steel ladle bottom blowing air brick and application method |
| CN115026273B (en) * | 2022-06-16 | 2023-10-13 | 莱芜钢铁集团银山型钢有限公司 | Ladle argon blowing nozzle pocket brick and argon blowing metallurgical method thereof |
| CN115198057B (en) * | 2022-06-16 | 2023-11-21 | 山东钢铁股份有限公司 | Molten steel refining method of steel for ocean platform below EH36 |
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