CN108273987B - Ladle air-permeable upper nozzle pocket brick and method for controlling ladle slag discharging - Google Patents
Ladle air-permeable upper nozzle pocket brick and method for controlling ladle slag discharging Download PDFInfo
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- CN108273987B CN108273987B CN201810309436.7A CN201810309436A CN108273987B CN 108273987 B CN108273987 B CN 108273987B CN 201810309436 A CN201810309436 A CN 201810309436A CN 108273987 B CN108273987 B CN 108273987B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
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Abstract
A ladle permeable upper nozzle pocket brick and a method for controlling ladle slag discharging thereof are disclosed, the device comprises a ladle upper nozzle pocket brick body, a permeable plug, an air chamber box, a permeable plug base, an air blowing pipeline, a steel flowing hole and an upper nozzle mounting hole; the control method comprises the following steps: 1) placing a ladle air-permeable upper nozzle pocket brick at a steel tapping hole at the bottom of a ladle, and communicating an air blowing pipeline penetrating out of the ladle air-permeable upper nozzle pocket brick with an air channel pipeline; 2) when the height of the molten steel in the steel ladle and the height of the steel ladle are equal to 1: 16-35, inert gas is blown into the molten steel through a blowing pipeline, so that a round convex area without a slag layer is formed on the liquid level of the molten steel, and slag falling of the steel ladle is inhibited; 3) when the slag is discharged from the ladle, closing a ladle nozzle and stopping blowing gas through the blowing pipeline; according to the method, argon is blown in at the last stage of pouring, a round convex area without a slag layer is formed on the liquid level of the molten steel, the slag falling of the steel ladle caused by confluence vortex and drainage sink pit is effectively inhibited, the molten steel pouring allowance in the steel ladle is reduced, and the molten steel pouring allowance is reduced by more than 35% on a same scale.
Description
Technical Field
The invention belongs to the field of steel continuous casting, and particularly relates to a ladle air-permeable upper nozzle pocket brick and a method for controlling ladle slagging.
Background
The control of ladle slag discharge in the continuous casting process is always an industry common problem, and slag discharge is generated in molten steel in a ladle at the last stage of pouring due to confluent vortex, drainage and sink pit and other reasons, so that inclusion is increased, and the quality defect of a casting blank is caused. The slagging is usually controlled by a slagging control system, namely a water gap is closed immediately when ladle slagging is detected in the pouring process, but a large amount of molten steel in a ladle is left for pouring, and the metal yield is reduced.
Chinese patent document CN104028739A (patent number: 201410274221) discloses a ladle gas-permeable upper nozzle pocket brick and a method for controlling nozzle slag entrapment, wherein a plurality of cylindrical gas-permeable ceramic rods are added into a body of the ladle upper nozzle pocket brick, the ceramic rods are 10-16, the diameter of the ceramic rods is 12-18 mm, the height of the ceramic rods is 320-380 mm, and argon is blown into molten steel through the gas-permeable ceramic rods to control the nozzle slag entrapment problem. The patent mainly aims at the problem of slag entrapment of molten steel. This patent suffers from the following disadvantages: the diameter of the ceramic air-permeable rod is too small, so that the air circulation is not facilitated, and the problem of slag entrapment caused by vortex (vortex) cannot be effectively prevented; the influence of the drainage sink pit on the slag falling of the steel ladle is not considered, and a control measure cannot be provided for the slag falling caused by the drainage sink pit; the number of the air-permeable ceramic rods is too large, the length of the air-permeable ceramic rods is too long, the production cost of the nozzle brick cup is high, and the nozzle brick cup is not suitable for industrial production.
Chinese patent document CN104525929A (patent number: 201410805369) discloses a method for controlling slag discharging of a ladle by blowing argon gas to a ring steel-tapping hole at the bottom of the ladle, wherein air bricks with the width of 50-300 mm are arranged around the steel-tapping hole at the bottom of the ladle, and when the height of the liquid level of molten steel pouring in the ladle is 150-400 mm, argon gas is blown into the ladle through the ring air bricks. This patent suffers from the following disadvantages: the structure of the annular air brick is not described in detail, the production cost of the air ring is high, and large-scale popularization and application of field large-scale production are difficult.
Chinese patent document CN106978519A (patent No. 201710263683.3) discloses a method for blowing argon to prevent swirl slag entrapment during steel ladle tapping, which is to blow air at a small flow rate through an air blowing hole at the bottom of a steel ladle, thereby disturbing the flow field distribution of molten steel during tapping and inhibiting the occurrence of swirl slag entrapment. This patent suffers from the following disadvantages: the ladle bottom reconstruction engineering quantity is large, an effective ladle bottom blowing device is not provided, and the service life problem of a bottom blowing element is not considered; the influence of the drainage sink pit on the slag falling of the steel ladle is not considered, and a method for controlling the slag falling of the drainage sink pit is not provided; the effect of controlling the slag discharge of the ladle is not good enough.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the ladle air-permeable upper nozzle pocket brick and the method for controlling the slag discharging of the ladle, the design of the nozzle pocket brick is based on the comprehensive consideration of the safety and the economy of the field industrial mass production, the structure is reasonable, the production cost is low, the slag discharging of the ladle can be effectively inhibited, the molten steel pouring allowance in the ladle is reduced, the molten steel yield is reduced by more than 35 percent on the same scale, and the molten steel yield is greatly improved.
The invention relates to a ladle ventilating upper nozzle pocket brick, which comprises a ladle upper nozzle pocket brick body, a ventilating plug, an air chamber box, a ventilating plug base, a blowing pipeline, a steel flowing hole and an upper nozzle mounting hole; the vent plug, the air chamber box, the vent plug base, the air blowing pipeline, the steel flowing hole and the water feeding port mounting hole are all arranged inside the ladle water feeding port brick cup body; the runner hole is positioned above the upper nozzle mounting hole and communicated with the upper nozzle mounting hole, and the whole runner hole and the upper nozzle mounting hole penetrate through the ladle upper nozzle brick cup body from top to bottom; be provided with ventilative stopper, air chamber box, ventilative stopper base and gas blow pipe around the flowing steel hole, ventilative stopper and the airtight encapsulation of ventilative stopper base are connected, are provided with the air chamber box between ventilative stopper and the ventilative stopper base, and ventilative stopper is located ventilative stopper base top, and the through-hole has been seted up to ventilative stopper base bottom, sealing connection gas blow pipe on the through-hole, and gas blow pipe wears out from ladle upper nozzle brick body side, and gas blow pipe's minimum is higher than the minimum in flowing steel hole.
The number of the vent plugs is a plurality; the number of the air chamber boxes is a plurality; the number of the base of the venting plug is a plurality; and the number of the venting plugs is equal to the number of the air chamber boxes and equal to the number of the venting plug bases.
The number of the vent plugs is 2 or 4; the number of the air chamber boxes is 2 or 4; the number of the vent plug bases is 2 or 4, and the number of the vent plugs is equal to the number of the air chamber boxes and equal to the number of the vent plug bases.
The ladle air-permeable upper nozzle pocket brick is a cuboid with a square upper surface; the steel flowing hole comprises an upper truncated cone-shaped channel and a lower cylindrical channel, the longitudinal center line of the upper truncated cone-shaped channel and the longitudinal center line of the lower cylindrical channel are coaxially arranged, the diameter of an upper port of the upper truncated cone-shaped channel is larger than that of a lower port of the upper truncated cone-shaped channel, and the diameter of the lower port of the upper truncated cone-shaped channel is equal to that of the lower cylindrical channel; the upper nozzle mounting hole is a truncated cone-shaped upper nozzle mounting hole, the diameter of an upper port of the truncated cone-shaped upper nozzle mounting hole is smaller than that of a lower port of the truncated cone-shaped upper nozzle mounting hole, the diameter of the upper port of the truncated cone-shaped upper nozzle mounting hole is larger than that of the lower cylindrical channel, the longitudinal center line of the truncated cone-shaped upper nozzle mounting hole and the longitudinal center line of the lower cylindrical channel are coaxially arranged, and the longitudinal center line of the truncated cone-shaped upper nozzle mounting hole is one of the center lines of the air-permeable upper nozzle pocket brick of the ladle; the vent plugs are uniformly arranged in the circumferential direction of the flow steel hole, each vent plug comprises an upper-end truncated-cone-shaped vent plug and a lower-end cylindrical vent plug, the longitudinal center line of the upper-end truncated-cone-shaped vent plug and the longitudinal center line of the lower-end cylindrical vent plug are coaxially arranged, the upper end face of the upper-end truncated-cone-shaped vent plug and the upper surface of the ladle upper ventilating nozzle block are positioned on the same horizontal plane, and the diameter of the bottom face of the upper-end truncated-cone-shaped vent plug is equal to that of the bottom face of the lower-end; the air chamber box is a cylindrical air chamber box, and the diameter of the upper surface of the cylindrical air chamber box is equal to the diameter of the bottom surface of the cylindrical ventilation plug at the lower end; the vent plug base is a cylindrical vent plug base with a through hole, the diameter of the bottom surface of the cylindrical vent plug base with the through hole is larger than that of the bottom surface of the cylindrical vent plug at the lower end, the total height of a cylinder at the lower end of the vent plug and the cylindrical air chamber box is smaller than that of the cylindrical vent plug base with the through hole, and the longitudinal center line of the cylindrical vent plug base with the through hole and the longitudinal center line of the cylindrical vent plug are coaxially arranged; the air blowing pipeline communicated with the base of the air permeable plug is converged in one pipeline and then penetrates out of the side surface of the ladle upper nozzle pocket brick body; the shortest distance between the circle of the upper end opening of the 1/2 runner hole and the angle of the upper end surface of the ladle air-permeable upper nozzle pocket brick is not more than the shortest distance between the center of the upper end surface of the air-permeable plug and the upper end opening of the runner hole is not more than 3/4 of the shortest distance between the circle of the upper end opening of the runner hole and the angle of the upper end surface of the ladle air-permeable upper nozzle pocket brick.
The cuboid-shaped ladle ventilating upper nozzle pocket brick is characterized in that the length of the side of a square surface at the upper end of the ladle ventilating upper nozzle pocket brick, the height of the ladle ventilating upper nozzle pocket brick, the diameter of an upper port of an upper circular truncated cone-shaped channel of a runner hole, the diameter of a lower port of an upper circular truncated cone-shaped channel of the runner hole, the height of a lower cylindrical channel of the runner hole, the diameter of an upper port of a circular truncated cone-shaped upper nozzle mounting hole, the diameter of a lower port of a circular truncated cone-shaped upper nozzle mounting hole, the height of a circular truncated cone-shaped upper nozzle mounting hole, the diameter of an upper end surface of an upper circular truncated cone-shaped ventilating plug, the diameter of a lower end surface of an end circular truncated cone-shaped ventilating plug, the height of a lower cylindrical ventilating plug, the height of a cylindrical air chamber box, the diameter of the bottom surface of a base of the cylindrical ventilating plug and the height of the cylindrical ventilating plug are respectively set to be 475-100 (160-180): 475-200): 450-530: (200): 475-530): 200: (200) 200 to 220, 150 to 200, 30 to 50, 40 to 60, 150 to 200, 5 to 10, 5 to 15, 50 to 70, 10 to 40; the inclination angle between the side surface of the upper end truncated cone-shaped air plug of the air plug and the horizontal plane is 80-89 degrees.
The lower end cylindrical ventilation plug, the air chamber box and the ventilation plug base are integrally formed. Fully consider that ventilative stopper is connected the gas tightness with lower extreme air chamber box and ventilative stopper base, the purpose is the prevention gas leakage.
The number of the vent plugs is 2, and the vent plugs are symmetrically distributed at the opposite corners of the nozzle pocket brick; or the number of the vent plugs is 4, and the vent plugs are symmetrically distributed at four corners of the nozzle pocket brick.
The air chamber box be cylindrical, because of the leakproofness of the equipment of blowing, connect the air chamber box below the ventilative stopper, the air chamber box has easy shaping, anti-drop, prevents that the gas side from leaking and breathe freely advantage such as even.
The gas used in the gas blowing pipeline is inert gas.
The shortest distance between the center of the upper end surface of the air-permeable plug and the upper end surface of the runner hole is more than or equal to 1/2 of the shortest distance between the circle of the upper end surface of the runner hole and the angle between the circle of the upper end surface of the air-permeable upper nozzle block of the ladle and the upper end surface of the air-permeable upper nozzle block of the ladle; the principle of setting does: because in the ladle pouring process, molten steel can erode the nozzle pocket brick constantly, especially the erosion at the upper port of the steel flowing hole is more serious, along with the pouring, the diameter of the upper port of the steel flowing hole is larger and larger, the position of the vent plug cannot be too close to the steel flowing hole, accidents such as steel leakage and the like are easily caused, and the safety distance is set based on the safety consideration of field production.
The shortest distance between the center of the upper end surface of the air-permeable plug and the upper end surface of the runner hole is less than or equal to 3/4 of the shortest distance between the circle of the upper end surface of the runner hole and the angle between the circle of the upper end surface of the air-permeable upper nozzle block of the ladle and the upper end surface of the air-permeable upper nozzle block of the ladle; the principle of setting does: because the position that ladle bottom brick was placed is close to the nozzle pocket brick in the building process of ladle package bottom, for preventing that the ventilative stopper surface in the nozzle pocket brick is covered by the ladle bottom brick, influences the effect of blowing, the position of ventilative stopper can not be too near apart from the corner of ladle nozzle pocket brick.
The invention discloses a method for controlling ladle slag discharging by adopting a ladle ventilating upper nozzle pocket brick, which comprises the following specific steps:
step 1: placing a ladle air-permeable upper nozzle pocket brick around a steel tapping hole at the bottom of a ladle, and communicating an air blowing pipeline penetrating out of the ladle air-permeable upper nozzle pocket brick with an air channel pipeline;
step 2: when the height of the molten steel in the steel ladle and the height of the steel ladle are equal to 1: 16-35, inert gas is blown into the molten steel through a blowing pipeline, so that a round convex area without a slag layer is formed on the liquid level of the molten steel, and slag falling of the steel ladle is inhibited; wherein the pressure of the blown gas is 0.13 to 0.19MPa, and the gas flow rate is 2 to 10Nm3/h；
And step 3: when the slag is discharged from the ladle, the water port of the ladle is closed, and the gas is stopped blowing in through the blowing pipeline.
The method for controlling the slag discharging of the ladle by adopting the ladle ventilating upper nozzle pocket brick comprises the following steps:
in the step 1, an air path pipeline is additionally arranged at the bottom of the ladle and is connected with an air blowing pipeline (5) penetrating through the side surface of the ladle air-permeable upper nozzle pocket brick.
In the step 2, the inert gas is argon.
In the step 2, the height of the molten steel in the steel ladle is 100-150 mm.
In step 2, the round convex area means: when the two-phase flow reaches the surface of the molten steel, gas and liquid are separated, the gas enters the atmosphere, and the molten steel which is driven to flow towards the liquid surface forms an area with a certain diameter on the liquid surface due to the action of inertia force, which is called a round convex area; the steel ladle slag discharging is effectively inhibited by forming the round convex area, and the residual steel amount of the molten steel is reduced.
Compared with the prior art, the ladle air-permeable upper nozzle pocket brick and the method for controlling the slag discharging of the ladle have the advantages that:
(1) the ladle ventilating upper nozzle pocket brick fully considers the use safety and the production economy of field large-scale production, designs a reasonable ventilating plug structure and a reasonable mounting position, effectively prevents molten steel from corroding the ventilating plug, and avoids accidents such as steel leakage and the like in the molten steel pouring process; the lower end cylinder of the air-permeable plug is integrally connected with the air chamber box and the air-permeable plug base, so that the air leakage of the device can be effectively prevented; based on the consideration of the production cost, the structure of symmetrically placing the air-permeable plugs is adopted under the condition of not influencing the air blowing effect; the lower end of the ventilation plug is connected with the air chamber box, and the air chamber box has the advantages of easy molding, falling prevention, gas side leakage prevention, uniform ventilation and the like; the number of the vent plugs is 2 or 4, so that the production cost of the ladle vent nozzle pocket brick can be reduced, and the large-scale field application is facilitated. Compared with the application of 10-16 ceramic rods in the ladle upper nozzle pocket brick in the comparative document 1 (Chinese patent document CN104028739A), the invention has better use safety and production economy, has more obvious effect of controlling ladle slag discharge, and is more suitable for large-scale industrial application on site; compared with the annular air brick in the application reference 2 (Chinese patent document CN104525929A), the invention has lower production cost and is more suitable for large-scale on-site production, popularization and application.
(2) According to the method for controlling the steel ladle slag discharging, the inert gas is blown in at the last stage of pouring, and the position and the diameter of the ventilation plug, the argon blowing pressure and the argon blowing flow are combined, so that a round convex area without a slag layer can be formed on the liquid level of molten steel, the steel ladle slag discharging caused by confluence vortex and drainage sink pit is effectively inhibited, the molten steel pouring allowance in the steel ladle is reduced, and the molten steel pouring allowance is reduced by more than 35% on a same scale.
Drawings
FIG. 1 is a sectional view of a ladle gas-permeable nozzle pocket brick according to embodiments 1 to 3 of the present invention;
FIG. 2 is a top view showing the structure of a permeable upper nozzle brick cup for a ladle in accordance with embodiments 2 and 3 of the present invention;
FIG. 3 is a schematic structural view of a blowing device consisting of four venting plugs in a ladle venting upper nozzle pocket brick according to embodiments 2 and 3 of the present invention; wherein, (a) the blowing device is in front view, (b) the blowing device is in top view;
FIG. 4 is a schematic structural view of a blowing device formed by two venting plugs in a ladle permeable upper nozzle pocket brick according to embodiment 1 of the present invention; (c) a front view of the blowing device, and (d) a top view of the blowing device.
In the figure, 1, a ladle upper nozzle pocket brick body; 2. a venting plug; 3. an air chamber box; 4. a venting plug base; 5. an air blowing pipeline; 6. a steel flowing hole; 7. a water feeding port mounting hole; 8. an upper truncated cone-shaped vent plug; 9. a lower cylindrical vent plug; 10. an upper frusto-conical channel; 11. a lower cylindrical passage.
Detailed Description
Example 1
A ladle permeable upper nozzle pocket brick is shown in figures 1 and 4 and comprises a ladle upper nozzle pocket brick body (1), a permeable plug (2), a gas chamber box (3), a permeable plug base (4), a blowing pipeline (5), a steel flowing hole (6) and an upper nozzle mounting hole (7); the vent plug (2), the air chamber box (3), the vent plug base (4), the cast steel hole (6) and the upper nozzle mounting hole (7) are all arranged inside the ladle upper nozzle pocket brick body (1), and the main body of the air blowing pipeline (5) is arranged inside the ladle upper nozzle pocket brick body (1) and penetrates out of the side face of the ladle upper nozzle pocket brick body (1); the steel flow hole (6) is positioned above the upper nozzle mounting hole (7) and communicated with the upper nozzle mounting hole, and the steel flow hole (6) and the upper nozzle mounting hole (7) integrally penetrate through the ladle upper nozzle pocket brick body (1) from top to bottom; be provided with ventilative stopper (2) around flowing steel hole (6), air chamber box (3), ventilative stopper base (4) and gas blow pipe (5), ventilative stopper (2) and ventilative stopper base (4) airtight packaging are connected, be provided with air chamber box (3) between ventilative stopper (2) and ventilative stopper base (4), ventilative stopper (2) are located ventilative stopper base (4) top, the through-hole has been seted up to ventilative stopper base (4) bottom, sealing connection gas blow pipe (5) on the through-hole, gas blow pipe (5) are worn out from ladle upper nozzle brick body (1) side, the minimum point of gas blow pipe (5) is higher than the minimum point of flowing steel hole (6).
The number of the ventilation plugs (2) is 2, the number of the air chamber boxes (3) is 2, and the ventilation plugs (2) are symmetrically distributed at the diagonal positions of the nozzle brick.
The ladle air-permeable upper nozzle pocket brick is a cuboid with a square upper surface; the steel flowing hole (6) comprises an upper circular truncated cone-shaped channel (10) and a lower cylindrical channel (11), the longitudinal center line of the upper circular truncated cone-shaped channel (10) and the longitudinal center line of the lower cylindrical channel (11) are coaxially arranged, the diameter of the upper port of the upper circular truncated cone-shaped channel (10) is larger than that of the lower port of the upper circular truncated cone-shaped channel, and the diameter of the lower port of the upper circular truncated cone-shaped channel (10) is equal to that of the lower cylindrical channel (11); the upper nozzle mounting hole (7) is a truncated cone-shaped upper nozzle mounting hole, the diameter of the upper port of the truncated cone-shaped upper nozzle mounting hole is smaller than that of the lower port of the truncated cone-shaped upper nozzle mounting hole, the diameter of the upper port of the truncated cone-shaped upper nozzle mounting hole is larger than that of the cylindrical channel (11) at the lower part of the steel flowing hole (6), the longitudinal center line of the truncated cone-shaped upper nozzle mounting hole is coaxial with that of the cylindrical channel (11) at the lower part of the steel flowing hole (6), and the longitudinal center line of the truncated cone-shaped upper nozzle mounting hole is one of the center lines of the steel ladle air-permeable upper nozzle pocket bricks; the vent plugs (2) are uniformly arranged in the circumferential direction of the flow hole (6), each vent plug (2) comprises an upper-end frustum-shaped vent plug (8) and a lower-end cylindrical vent plug (9), the longitudinal center line of each upper-end frustum-shaped vent plug (8) and the longitudinal center line of each lower-end cylindrical vent plug (9) are coaxially arranged, the upper end surface of each upper-end frustum-shaped vent plug (8) and the upper surface of the upper ladle ventilating nozzle block are positioned on the same horizontal plane, and the diameter of the bottom surface of each upper-end frustum-shaped vent plug (8) is equal to that of the bottom surface of each lower-end cylindrical vent plug (9); the air chamber box (3) is a cylindrical air chamber box, and the diameter of the upper surface of the cylindrical air chamber box is equal to the diameter of the bottom surface of the lower cylindrical ventilation plug (9); the vent plug base (4) is a cylindrical vent plug base with a through hole, the diameter of the bottom surface of the cylindrical vent plug base (4) with the through hole is larger than that of the bottom surface of the cylindrical vent plug (9) at the lower end, the total height of the cylinder at the lower end of the vent plug (2) and the cylindrical air chamber box is smaller than that of the cylindrical vent plug base with the through hole, and the longitudinal center line of the cylindrical vent plug base with the through hole and the longitudinal center line of the cylindrical vent plug are coaxially arranged; the air blowing pipeline (5) communicated with the base of the air permeable plug is converged in one pipeline and then penetrates out of the side surface of the ladle upper nozzle pocket brick body (1); the shortest distance d2 between the circle of the upper end port of the 1/2 steel runner hole (6) and the angle of the upper end surface of the ladle gas permeable upper nozzle holder block is not less than the shortest distance d1 between the circle of the upper end surface of the gas plug (2) and the upper end port of the steel runner hole (6) is not more than the shortest distance d2 between the circle of the upper end port of the steel runner hole (6) and the angle of the upper end surface of the ladle gas permeable upper nozzle holder block (1/2d2 is not more than d1 and not more than 3/4d 2).
The side length of the square surface at the upper end of the long ladle air-permeable upper nozzle pocket brick is 425mm, and the height of the long ladle air-permeable upper nozzle pocket brick is 450 mm; the diameter D4 of the upper port of the upper truncated cone-shaped channel (10) of the steel flowing hole (6) is 200mm, the diameter D5 of the lower port of the upper truncated cone-shaped channel (10) is 80mm, the height L3 of the upper truncated cone-shaped channel (10) of the steel flowing hole (6) is 160mm, and the height L4 of the lower cylindrical channel (11) is 150 mm; in the upper nozzle mounting hole (7), the diameter D6 of the upper port of the truncated cone-shaped upper nozzle mounting hole is 180mm, the diameter D7 of the lower port of the truncated cone-shaped upper nozzle mounting hole is 200mm, and the height L5 of the truncated cone-shaped upper nozzle mounting hole is 150 mm; in the vent plug (2), the diameter D1 of the upper end surface of the upper-end truncated cone-shaped vent plug (8) is 30mm, the diameter D2 of the lower end surface of the upper-end truncated cone-shaped vent plug (8) is 40mm, the height L1 of the upper-end truncated cone-shaped vent plug (8) is 160mm, the inclination angle between the side surface of the upper-end truncated cone-shaped vent plug (8) and the horizontal plane is 87 degrees, and the height of the lower-end cylindrical vent plug (9) is 5 mm; the height of the air chamber box (3) is 5 mm; the diameter D3 of the bottom surface of cylindrical ventilative stopper base be 50mm, cylindrical ventilative stopper's height L2 is 15 mm.
The lower end cylindrical ventilation plug (9), the air chamber box (3) and the ventilation plug base (4) are integrally formed. The connection airtightness of the vent plug (2), the lower end air chamber box (3) and the vent plug base (4) is fully considered, and the purpose is to prevent air leakage.
The air chamber box (3) is cylindrical, the air chamber box (3) is connected below the ventilation plug (2) based on the consideration of the air tightness of the blowing equipment, and the air chamber box (3) has the advantages of easiness in forming, falling prevention, prevention of air side leakage, uniformity in ventilation and the like.
The structural section view of the ladle gas-permeable upper nozzle pocket brick of the embodiment is shown in figure 1; the schematic structural diagram of the blowing device formed by two vent plugs in the ladle vent nozzle pocket brick is shown in figure 4.
In this embodiment, a 60-ton ladle is used, and the height of the ladle is 2600 mm.
The method for controlling the slag discharging of the ladle by adopting the ladle ventilating upper nozzle pocket brick comprises the following specific steps:
step 1: a ladle air-permeable upper nozzle pocket brick is placed at a steel tapping hole at the bottom of the ladle, and an air channel pipeline is additionally arranged at the bottom of the ladle and is connected with an air blowing pipeline (5) penetrating through the side surface of the ladle air-permeable upper nozzle pocket brick;
step 2: when the height of the liquid level of the molten steel in the steel ladle is 100mm, argon is blown into the molten steel through a blowing pipeline, so that a round convex area without a slag layer is formed on the liquid level of the molten steel, and the slag falling of the steel ladle is inhibited; wherein the pressure of argon gas blown in is 0.13MPa, and the flow rate of argon gas is 2Nm3/h。
And step 3: when the slag is discharged from the ladle, the water port of the ladle is closed, and the argon gas is stopped blowing in through the blowing pipeline (5).
Example 2
A ladle permeable nozzle pocket block, which is shown in figures 1-3. The steel ladle upper nozzle pocket brick comprises a steel ladle upper nozzle pocket brick body (1), a ventilation plug (2), a gas chamber box (3), a ventilation plug base (4), a gas blowing pipeline (5), a steel flowing hole (6) and an upper nozzle mounting hole (7); the vent plug (2), the air chamber box (3), the vent plug base (4), the cast steel hole (6) and the upper nozzle mounting hole (7) are all arranged inside the ladle upper nozzle pocket brick body (1), and the main body of the air blowing pipeline (5) is arranged inside the ladle upper nozzle pocket brick body (1) and penetrates out of the side face of the ladle upper nozzle pocket brick body (1); the steel flow hole (6) is positioned above the upper nozzle mounting hole (7) and communicated with the upper nozzle mounting hole, and the steel flow hole (6) and the upper nozzle mounting hole (7) integrally penetrate through the ladle upper nozzle pocket brick body (1) from top to bottom; be provided with ventilative stopper (2) around flowing steel hole (6), air chamber box (3), ventilative stopper base (4) and gas blow pipe (5), ventilative stopper (2) and ventilative stopper base (4) airtight packaging are connected, be provided with air chamber box (3) between ventilative stopper (2) and ventilative stopper base (4), ventilative stopper (2) are located ventilative stopper base (4) top, the through-hole has been seted up to ventilative stopper base (4) bottom, sealing connection gas blow pipe (5) on the through-hole, gas blow pipe (5) are worn out from ladle upper nozzle brick body (1) side, the minimum point of gas blow pipe (5) is higher than the minimum point of flowing steel hole (6).
The number of the ventilation plugs (2) is 4, the number of the air chamber boxes (3) is 4, and the ventilation plugs (2) are symmetrically distributed at four corners of the nozzle brick cup.
The ladle air-permeable upper nozzle pocket brick is a cuboid with a square upper surface; the steel flowing hole (6) comprises an upper circular truncated cone-shaped channel (10) and a lower cylindrical channel (11), the longitudinal center line of the upper circular truncated cone-shaped channel (10) and the longitudinal center line of the lower cylindrical channel (11) are coaxially arranged, the diameter of the upper port of the upper circular truncated cone-shaped channel (10) is larger than that of the lower port of the upper circular truncated cone-shaped channel, and the diameter of the lower port of the upper circular truncated cone-shaped channel (10) is equal to that of the lower cylindrical channel (11); the upper nozzle mounting hole (7) is a truncated cone-shaped upper nozzle mounting hole, the diameter of the upper port of the truncated cone-shaped upper nozzle mounting hole is smaller than that of the lower port of the truncated cone-shaped upper nozzle mounting hole, the diameter of the upper port of the truncated cone-shaped upper nozzle mounting hole is larger than that of the cylindrical channel (11) at the lower part of the steel flowing hole (6), the longitudinal center line of the truncated cone-shaped upper nozzle mounting hole is coaxial with that of the cylindrical channel (11) at the lower part of the steel flowing hole (6), and the longitudinal center line of the truncated cone-shaped upper nozzle mounting hole is one of the center lines of the steel ladle air-permeable upper nozzle pocket bricks; the vent plugs (2) are uniformly arranged in the circumferential direction of the flow hole (6), each vent plug (2) comprises an upper-end frustum-shaped vent plug (8) and a lower-end cylindrical vent plug (9), the longitudinal center line of each upper-end frustum-shaped vent plug (8) and the longitudinal center line of each lower-end cylindrical vent plug (9) are coaxially arranged, the upper end surface of each upper-end frustum-shaped vent plug (8) and the upper surface of the upper ladle ventilating nozzle block are positioned on the same horizontal plane, and the diameter of the bottom surface of each upper-end frustum-shaped vent plug (8) is equal to that of the bottom surface of each lower-end cylindrical vent plug (9); the air chamber box (3) is a cylindrical air chamber box, and the diameter of the upper surface of the cylindrical air chamber box is equal to the diameter of the bottom surface of the lower cylindrical ventilation plug (9); the vent plug base (4) is a cylindrical vent plug base with a through hole, the diameter of the bottom surface of the cylindrical vent plug base (4) with the through hole is larger than that of the bottom surface of the cylindrical vent plug (9) at the lower end, the total height of the cylinder at the lower end of the vent plug (2) and the cylindrical air chamber box is smaller than that of the cylindrical vent plug base with the through hole, and the longitudinal center line of the cylindrical vent plug base with the through hole and the longitudinal center line of the cylindrical vent plug are coaxially arranged; the air blowing pipeline (5) communicated with the base of the air permeable plug is converged in one pipeline and then penetrates out of the side surface of the ladle upper nozzle pocket brick body (1); the shortest distance d2 between the circle of the upper end port of the 1/2 steel runner hole (6) and the angle of the upper end surface of the ladle gas permeable upper nozzle holder block is not less than the shortest distance d1 between the circle of the upper end surface of the gas plug (2) and the upper end port of the steel runner hole (6) is not more than the shortest distance d2 between the circle of the upper end port of the steel runner hole (6) and the angle of the upper end surface of the ladle gas permeable upper nozzle holder block (1/2d2 is not more than d1 and not more than 3/4d 2).
The side length of the square surface at the upper end of the long ladle air-permeable upper nozzle pocket brick is 450mm, and the height of the long ladle air-permeable upper nozzle pocket brick is 490 mm; the diameter D4 of the upper port of the upper truncated cone-shaped channel (10) of the steel flowing hole (6) is 200mm, the diameter D5 of the lower port of the upper truncated cone-shaped channel (10) is 80mm, the height L3 of the upper truncated cone-shaped channel (10) of the steel flowing hole (6) is 160mm, and the height L4 of the lower cylindrical channel (11) is 150 mm; in the upper nozzle mounting hole (7), the diameter D6 of the upper port of the truncated cone-shaped upper nozzle mounting hole is 190mm, the diameter D7 of the lower port of the truncated cone-shaped upper nozzle mounting hole is 210mm, and the height L5 of the truncated cone-shaped upper nozzle mounting hole is 180 mm; in the vent plug (2), the diameter D1 of the upper end surface of the upper-end truncated cone-shaped vent plug (8) is 35mm, the diameter D2 of the lower end surface of the upper-end truncated cone-shaped vent plug (8) is 50mm, the height L1 of the upper-end truncated cone-shaped vent plug (8) is 180mm, the inclination angle between the side surface of the upper-end truncated cone-shaped vent plug (8) and the horizontal plane is 88 degrees, and the height of the lower-end cylindrical vent plug (9) is 5 mm; the height of the air chamber box (3) is 5 mm; the diameter D3 of the bottom surface of cylindrical ventilative stopper base be 55mm, the height L2 of cylindrical ventilative stopper be 25 mm.
The lower end cylindrical ventilation plug (9), the air chamber box (3) and the ventilation plug base (4) are integrally formed. The connection airtightness of the vent plug (2), the lower end air chamber box (3) and the vent plug base (4) is fully considered, and the purpose is to prevent air leakage.
The air chamber box (3) is cylindrical, the air chamber box (3) is connected below the ventilation plug (2) based on the consideration of the air tightness of the blowing equipment, and the air chamber box (3) has the advantages of easiness in forming, falling prevention, prevention of air side leakage, uniformity in ventilation and the like.
The structural section view of the ladle gas-permeable upper nozzle pocket brick of the embodiment is shown in figure 1; the structural plan view of the ladle air-permeable upper nozzle pocket brick is shown in figure 2; the schematic structural diagram of the blowing device consisting of four venting plugs in the ladle venting nozzle pocket brick is shown in figure 3.
In the embodiment, a 120-ton steel ladle is adopted, and the height of the steel ladle is 3500 mm.
The method for controlling the slag discharging of the ladle by adopting the ladle ventilating upper nozzle pocket brick comprises the following specific steps:
step 1: a ladle air-permeable upper nozzle pocket brick is placed at a steel tapping hole at the bottom of the ladle, and an air channel pipeline is additionally arranged at the bottom of the ladle and is connected with an air blowing pipeline (5) penetrating through the side surface of the ladle air-permeable upper nozzle pocket brick;
step 2: when the height of the liquid level of the molten steel in the steel ladle is 130mm, argon is blown into the molten steel through a blowing pipeline, so that a round convex area without a slag layer is formed on the liquid level of the molten steel, and the slag falling of the steel ladle is inhibited; wherein the pressure of the argon gas blown in is 0.15MPa, and the flow rate of the argon gas is5Nm3/h。
And step 3: when the slag is discharged from the ladle, the water port of the ladle is closed, and the argon gas is stopped blowing in through the blowing pipeline (5).
The ladle permeable upper nozzle pocket brick and the method for controlling ladle slagging, which are disclosed by the embodiment 2 of the invention, are applied to 120-ton ladles on a sheet billet (CSP) production line of a certain steel mill in China, the service life of the ladle permeable upper nozzle pocket brick disclosed by the embodiment 2 of the invention is 35-50 furnaces, and the service life of the ladle permeable upper nozzle pocket brick meets the requirements of field production (the requirements of field production are 30-40 furnaces). Under the same process conditions, the method for controlling the steel ladle slagging in the embodiment 2 of the invention can reduce the casting allowance of the molten steel by more than 35 percent compared with the original process. The results of the comparison are shown in Table 1 below.
TABLE 1
| Item | Average steel allowance (kg/furnace) |
| Example 2 | 330 |
| Original process | 550 |
Example 3
A ladle permeable upper nozzle pocket brick is shown in figures 1-3 and comprises a ladle upper nozzle pocket brick body (1), a permeable plug (2), a gas chamber box (3), a permeable plug base (4), a blowing pipeline (5), a steel flowing hole (6) and an upper nozzle mounting hole (7); the vent plug (2), the air chamber box (3), the vent plug base (4), the cast steel hole (6) and the upper nozzle mounting hole (7) are all arranged inside the ladle upper nozzle pocket brick body (1), and the main body of the air blowing pipeline (5) is arranged inside the ladle upper nozzle pocket brick body (1) and penetrates out of the side face of the ladle upper nozzle pocket brick body (1); the steel flow hole (6) is positioned above the upper nozzle mounting hole (7) and communicated with the upper nozzle mounting hole, and the steel flow hole (6) and the upper nozzle mounting hole (7) integrally penetrate through the ladle upper nozzle pocket brick body (1) from top to bottom; be provided with ventilative stopper (2) around flowing steel hole (6), air chamber box (3), ventilative stopper base (4) and gas blow pipe (5), ventilative stopper (2) and ventilative stopper base (4) airtight packaging are connected, be provided with air chamber box (3) between ventilative stopper (2) and ventilative stopper base (4), ventilative stopper (2) are located ventilative stopper base (4) top, the through-hole has been seted up to ventilative stopper base (4) bottom, sealing connection gas blow pipe (5) on the through-hole, gas blow pipe (5) are worn out from ladle upper nozzle brick body (1) side, the minimum point of gas blow pipe (5) is higher than the minimum point of flowing steel hole (6).
The number of the ventilation plugs (2) is 4, the number of the air chamber boxes (3) is 4, and the ventilation plugs (2) are symmetrically distributed at four corners of the nozzle brick cup.
The ladle air-permeable upper nozzle pocket brick is a cuboid with a square upper surface; the steel flowing hole (6) comprises an upper circular truncated cone-shaped channel (10) and a lower cylindrical channel (11), the longitudinal center line of the upper circular truncated cone-shaped channel (10) and the longitudinal center line of the lower cylindrical channel (11) are coaxially arranged, the diameter of the upper port of the upper circular truncated cone-shaped channel (10) is larger than that of the lower port of the upper circular truncated cone-shaped channel, and the diameter of the lower port of the upper circular truncated cone-shaped channel (10) is equal to that of the lower cylindrical channel (11); the upper nozzle mounting hole (7) is a truncated cone-shaped upper nozzle mounting hole, the diameter of the upper port of the truncated cone-shaped upper nozzle mounting hole is smaller than that of the lower port of the truncated cone-shaped upper nozzle mounting hole, the diameter of the upper port of the truncated cone-shaped upper nozzle mounting hole is larger than that of the cylindrical channel (11) at the lower part of the steel flowing hole (6), the longitudinal center line of the truncated cone-shaped upper nozzle mounting hole is coaxial with that of the cylindrical channel (11) at the lower part of the steel flowing hole (6), and the longitudinal center line of the truncated cone-shaped upper nozzle mounting hole is one of the center lines of the steel ladle air-permeable upper nozzle pocket bricks; the vent plugs (2) are uniformly arranged in the circumferential direction of the flow hole (6), each vent plug (2) comprises an upper-end frustum-shaped vent plug (8) and a lower-end cylindrical vent plug (9), the longitudinal center line of each upper-end frustum-shaped vent plug (8) and the longitudinal center line of each lower-end cylindrical vent plug (9) are coaxially arranged, the upper end surface of each upper-end frustum-shaped vent plug (8) and the upper surface of the upper ladle ventilating nozzle block are positioned on the same horizontal plane, and the diameter of the bottom surface of each upper-end frustum-shaped vent plug (8) is equal to that of the bottom surface of each lower-end cylindrical vent plug (9); the air chamber box (3) is a cylindrical air chamber box, and the diameter of the upper surface of the cylindrical air chamber box is equal to the diameter of the bottom surface of the lower cylindrical ventilation plug (9); the vent plug base (4) is a cylindrical vent plug bottom provided with a through hole, the diameter of the bottom surface of the cylindrical vent plug base (4) provided with the through hole is larger than that of the bottom surface of the cylindrical vent plug (9) at the lower end, the total height of the cylinder at the lower end of the vent plug (2) and the cylindrical air chamber box is smaller than that of the cylindrical vent plug base provided with the through hole, and the longitudinal center line of the cylindrical vent plug base provided with the through hole and the longitudinal center line of the cylindrical vent plug are coaxially arranged; the air blowing pipeline (5) communicated with the base of the air permeable plug is converged in one pipeline and then penetrates out of the side surface of the ladle upper nozzle pocket brick body (1); the shortest distance d2 between the circle of the upper end port of the 1/2 steel runner hole (6) and the angle of the upper end surface of the ladle gas permeable upper nozzle holder block is not less than the shortest distance d1 between the circle of the upper end surface of the gas plug (2) and the upper end port of the steel runner hole (6) is not more than the shortest distance d2 between the circle of the upper end port of the steel runner hole (6) and the angle of the upper end surface of the ladle gas permeable upper nozzle holder block (1/2d2 is not more than d1 and not more than 3/4d 2).
The side length of the square surface at the upper end of the long ladle air-permeable upper nozzle pocket brick is 475mm, and the height of the long ladle air-permeable upper nozzle pocket brick is 520 mm; the diameter D4 of the upper port of the upper truncated cone-shaped channel (10) of the steel flowing hole (6) is 220mm, the diameter D5 of the lower port of the upper truncated cone-shaped channel (10) is 100mm, the height L3 of the upper truncated cone-shaped channel (10) of the steel flowing hole (6) is 200mm, and the height L4 of the lower cylindrical channel (11) is 160 mm; in the upper nozzle mounting hole (7), the diameter D6 of the upper port of the truncated cone-shaped upper nozzle mounting hole is 190mm, the diameter D7 of the lower port of the truncated cone-shaped upper nozzle mounting hole is 220mm, and the height L5 of the truncated cone-shaped upper nozzle mounting hole is 160 mm; in the vent plug (2), the diameter D1 of the upper end surface of the upper-end truncated cone-shaped vent plug (8) is 50mm, the diameter D2 of the lower end surface of the upper-end truncated cone-shaped vent plug (8) is 60mm, the height L1 of the upper-end truncated cone-shaped vent plug (8) is 200mm, the inclination angle between the side surface of the upper-end truncated cone-shaped vent plug (8) and the horizontal plane is 87 degrees, and the height of the lower-end cylindrical vent plug (9) is 10 mm; the height of the air chamber box (3) is 10 mm; the diameter D3 of the bottom surface of the cylindrical vent plug base is 70mm, and the height L2 of the cylindrical vent plug is 30 mm.
The lower end cylindrical ventilation plug (9), the air chamber box (3) and the ventilation plug base (4) are integrally formed. The connection airtightness of the vent plug (2), the lower end air chamber box (3) and the vent plug base (4) is fully considered, and the purpose is to prevent air leakage.
The air chamber box (3) is cylindrical, the air chamber box (3) is connected below the ventilation plug (2) based on the consideration of the air tightness of the blowing equipment, and the air chamber box (3) has the advantages of easiness in forming, falling prevention, prevention of air side leakage, uniformity in ventilation and the like.
The structural section view of the ladle gas-permeable upper nozzle pocket brick of the embodiment is shown in figure 1; the structural plan view of the ladle air-permeable upper nozzle pocket brick is shown in figure 2; the schematic structural diagram of the blowing device consisting of four venting plugs in the ladle venting nozzle pocket brick is shown in figure 3.
In this embodiment, a ladle of 180 tons is used, and the height of the ladle is 4100 mm.
The method for controlling the slag discharging of the ladle by adopting the ladle ventilating upper nozzle pocket brick comprises the following specific steps:
step 1: a ladle air-permeable upper nozzle pocket brick is placed at a steel tapping hole at the bottom of the ladle, and an air channel pipeline is additionally arranged at the bottom of the ladle and is connected with an air blowing pipeline (5) penetrating through the side surface of the ladle air-permeable upper nozzle pocket brick;
step 2: when the height of the liquid level of the molten steel in the steel ladle is 150mm, argon is blown into the molten steel through a blowing pipeline, so that a round convex area without a slag layer is formed on the liquid level of the molten steel, and the slag falling of the steel ladle is inhibited; wherein the pressure of argon gas blown in is 0.19MPa, and the flow rate of argon gas is 10Nm3/h。
And step 3: when the slag is discharged from the ladle, the water port of the ladle is closed, and the argon gas is stopped blowing in through the blowing pipeline (5).
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A ladle permeable upper nozzle pocket brick is characterized by comprising a ladle upper nozzle pocket brick body, a permeable plug, an air chamber box, a permeable plug base, an air blowing pipeline, a steel flowing hole and an upper nozzle mounting hole; the vent plug, the air chamber box, the vent plug base, the air blowing pipeline, the steel flowing hole and the water feeding port mounting hole are all arranged inside the ladle water feeding port brick cup body; the runner hole is positioned above the upper nozzle mounting hole and communicated with the upper nozzle mounting hole, and the whole runner hole and the upper nozzle mounting hole penetrate through the ladle upper nozzle brick cup body from top to bottom; the steel ladle upper nozzle brick cup comprises a steel ladle upper nozzle brick cup body, a vent plug base and a gas blowing pipeline, wherein the vent plug, a gas chamber box, the vent plug base and the gas blowing pipeline are arranged around a steel flowing hole;
the number of the vent plugs is a plurality; the number of the air chamber boxes is a plurality; the number of the base of the venting plug is a plurality; the number of the vent plugs is equal to the number of the air chamber boxes and equal to the number of the vent plug bases;
the ladle air-permeable upper nozzle pocket brick is a cuboid with a square upper surface; the steel flowing hole comprises an upper truncated cone-shaped channel and a lower cylindrical channel, the longitudinal center line of the upper truncated cone-shaped channel and the longitudinal center line of the lower cylindrical channel are coaxially arranged, the diameter of an upper port of the upper truncated cone-shaped channel is larger than that of a lower port of the upper truncated cone-shaped channel, and the diameter of the lower port of the upper truncated cone-shaped channel is equal to that of the lower cylindrical channel; the upper nozzle mounting hole is a truncated cone-shaped upper nozzle mounting hole, the diameter of an upper port of the truncated cone-shaped upper nozzle mounting hole is smaller than that of a lower port of the truncated cone-shaped upper nozzle mounting hole, the diameter of the upper port of the truncated cone-shaped upper nozzle mounting hole is larger than that of the lower cylindrical channel, the longitudinal center line of the truncated cone-shaped upper nozzle mounting hole and the longitudinal center line of the lower cylindrical channel are coaxially arranged, and the longitudinal center line of the truncated cone-shaped upper nozzle mounting hole is one of the center lines of the air-permeable upper nozzle pocket brick of the ladle; the vent plugs are uniformly arranged in the circumferential direction of the flow steel hole, each vent plug comprises an upper-end truncated-cone-shaped vent plug and a lower-end cylindrical vent plug, the longitudinal center line of the upper-end truncated-cone-shaped vent plug and the longitudinal center line of the lower-end cylindrical vent plug are coaxially arranged, the upper end face of the upper-end truncated-cone-shaped vent plug and the upper surface of the ladle upper ventilating nozzle block are positioned on the same horizontal plane, and the diameter of the bottom face of the upper-end truncated-cone-shaped vent plug is equal to that of the bottom face of the lower-end; the air chamber box is a cylindrical air chamber box, and the diameter of the upper surface of the cylindrical air chamber box is equal to the diameter of the bottom surface of the cylindrical ventilation plug at the lower end; the vent plug base is a cylindrical vent plug base with a through hole, the diameter of the bottom surface of the cylindrical vent plug base with the through hole is larger than that of the bottom surface of the cylindrical vent plug at the lower end, the total height of the cylindrical vent plug at the lower end and the cylindrical air chamber box is smaller than that of the cylindrical vent plug base with the through hole, and the longitudinal center line of the cylindrical vent plug base with the through hole and the longitudinal center line of the cylindrical vent plug at the lower end are coaxially arranged; the air blowing pipeline communicated with the base of the air permeable plug is converged in one pipeline and then penetrates out of the side surface of the ladle upper nozzle pocket brick body; the shortest distance between the circle of the upper end opening of the 1/2 runner hole and the angle of the upper end surface of the ladle air-permeable upper nozzle pocket brick is not more than the shortest distance between the center of the upper end surface of the air-permeable plug and the upper end opening of the runner hole is not more than 3/4 of the shortest distance between the circle of the upper end opening of the runner hole and the angle of the upper end surface of the ladle air-permeable upper nozzle pocket brick.
2. The ladle permeable nozzle pocket block according to claim 1, wherein the number of the gas permeable plugs is 2 or 4; the number of the air chamber boxes is 2 or 4; the number of the vent plug bases is 2 or 4, and the number of the vent plugs is equal to the number of the air chamber boxes and equal to the number of the vent plug bases.
3. The ladle permeable nozzle pocket block according to claim 2, wherein the number of the gas permeable plugs is 2, and the gas permeable plugs are symmetrically distributed at the opposite corners of the ladle permeable nozzle pocket block; or the number of the vent plugs is 4, and the vent plugs are symmetrically distributed at four corners of the ladle vent upper nozzle pocket brick.
4. The ladle permeable nozzle pocket block according to claim 1, wherein the rectangular parallelepiped ladle permeable nozzle pocket block has a side length of a square surface at an upper end thereof: height of the ladle air-permeable upper nozzle pocket brick: the diameter of the upper port of the upper circular truncated cone-shaped channel of the steel flowing hole is as follows: the diameter of the lower port of the upper circular truncated cone-shaped channel of the steel flowing hole is as follows: height of the upper truncated cone-shaped channel of the steel flowing hole: height of lower cylindrical passage of runner hole: the diameter of the upper port of the circular truncated cone-shaped upper nozzle mounting hole is as follows: diameter of lower port of circular truncated cone shaped upper nozzle mounting hole: height of the circular truncated cone shaped upper nozzle mounting hole: diameter of the upper end face of the upper end circular truncated cone-shaped air-permeable plug: diameter of lower end face of end circular truncated cone-shaped air plug: height of the truncated cone-shaped vent plug: height of lower cylindrical vent plug: height of cylindrical air cell box: diameter of bottom surface of the cylindrical venting plug base: the height of the cylindrical ventilation plug is (425-475): (450-530): (200-220): (70-100): (160-200): (140-180): (180-200): (200-220): (150-200): (30-50): (40-60): (150-200): (5-10): (5-15): (50-70): (10-40); the inclination angle between the side surface of the upper end truncated cone-shaped air plug of the air plug and the horizontal plane is 80-89 degrees.
5. The ladle permeable nozzle pocket block according to claim 1, wherein the lower cylindrical vent plug, the plenum box and the vent plug base are integrally formed.
6. The method for controlling the slag discharging of the ladle by adopting the ladle ventilating upper nozzle pocket brick is characterized by comprising the following specific steps:
step 1: placing a ladle air-permeable upper nozzle pocket brick around a steel tapping hole at the bottom of a ladle, and communicating an air blowing pipeline penetrating out of the ladle air-permeable upper nozzle pocket brick with an air channel pipeline;
step 2: when the height of the molten steel in the ladle is: the height of the ladle is 1: (16-35) blowing inert gas into the molten steel through a blowing pipeline to form a round convex area without a slag layer on the liquid level of the molten steel so as to inhibit slag falling of a steel ladle; wherein the pressure of the blown gas is 0.13 to 0.19MPa, and the gas flow rate is 2 to 10Nm3/h；
And step 3: when the slag is discharged from the ladle, the water port of the ladle is closed, and the gas is stopped blowing in through the blowing pipeline.
7. The method for controlling the slag discharging of the ladle by using the ladle permeable upper nozzle pocket brick as claimed in claim 6, wherein in the step 1, the gas path pipeline is arranged at the bottom of the ladle and connected with a gas blowing pipeline penetrating through the side surface of the ladle permeable upper nozzle pocket brick.
8. The method for controlling ladle slag tapping using the ladle permeable upper nozzle pocket brick as set forth in claim 6, wherein the inert gas in step 2 is argon gas.
9. The method for controlling the slag discharging of the ladle by using the ladle ventilating upper nozzle pocket brick as claimed in claim 6, wherein in the step 2, the height of the molten steel in the ladle is 100-150 mm.
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| CN109759575B (en) * | 2019-02-20 | 2023-08-25 | 山东钢铁股份有限公司 | Annular gas curtain wall for steel ladle and argon blowing metallurgical method thereof |
| 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 |
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| CN208146911U (en) * | 2018-04-09 | 2018-11-27 | 东北大学 | A kind of ladle ventilating filling pipe end brick cup |
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