Integrated method of ladle bottom blowing system ipv and application

Abstract

The application discloses a kind of IPV integrated method of ladle bottom blowing system and application, accurately fix seat brick on mounting plate, when knotting ladle bottom refractory material, it is ensured that material is filled to seat brick upper surface flush, after baking, clean seat brick hole, and air plug is tightened by air plug installation tool, after centering after trial installation, about 6mm thick fire clay is evenly applied on the outside of air plug, knock so that its bottom is against mounting plate, knock so that its bottom is against mounting plate, mica tube and protective cap are sleeved on air plug gas inlet pipe, fire clay is applied on the upper surface and periphery of gasket brick, put into seat brick pit, knock in place, upper pressing plate is sleeved along air plug gas inlet pipe, and graphite sealing gasket is placed in its pit, IPV mechanism bridge is placed in the groove of upper pressing plate, so that convex ring on IPV mechanism bridge is pressed graphite gasket, air plug gas inlet pipe is connected with gas source pipeline, purge and leak detection, install heat shield after confirming no error.

Description

Technical Field

[0001] This invention belongs to the field of continuous casting technology in iron and steel smelting, and specifically relates to an IPV integration method for a bottom blowing system of a steel ladle. Background Technology

[0002] Currently, in thin slab continuous casting and rolling production, bottom blowing of argon / nitrogen into the ladle is a key process for uniformizing the temperature and composition of molten steel and removing inclusions. The installation quality, operational standardization, and maintenance level of its core component, the vent plug, directly affect the success rate of blowing, ladle safety, and the lifespan of the vent plug. The following problems are commonly found in existing technologies:

[0003] Poor installation accuracy: The alignment of the vent plug, pad brick and seat brick relies on manual experience, which is prone to misalignment, resulting in poor sealing, gas leakage or uneven airflow.

[0004] Low sealing reliability: Traditional sealing methods (such as ordinary gaskets) are prone to failure at high temperatures, and the common practice of reuse leads to a high risk of gas leakage.

[0005] Hot replacement is difficult: Online hot replacement of the vent plug is dangerous, time-consuming, and the quality of hot replacement is difficult to guarantee, which affects the turnover of steel ladles and operational safety.

[0006] Disassembly is inefficient and dangerous: the vent plugs bonded with residual steel are difficult to remove, often requiring violent impact, which can easily damage the bottom of the pack and pose safety hazards.

[0007] While there are patents in the existing technology that involve the installation of vent plugs or bottom blowing processes, they mostly focus on single tools or local process improvements, and lack a complete, integrated, and standardized system solution that covers the entire process from refractory installation, mechanism alignment, process operation to offline maintenance.

[0008] In view of the above factors, an IPV integration method for a ladle bottom blowing system is provided. Precise installation and standardized operation reduce mechanical damage to the seat bricks and mounting plates, and systematic maintenance procedures can promptly detect and handle potential faults, extending the overall service life of the IPV mechanism. Summary of the Invention

[0009] The purpose of this invention is to provide an IPV integration method and application for a ladle bottom blowing system to solve the problems mentioned in the background art.

[0010] The objective of this invention is achieved through the following technical solution: an IPV integration method for a ladle bottom blowing system, specifically comprising the following steps:

[0011] S1, Cold Installation Stage

[0012] When fixing the base brick precisely onto the mounting plate and tying the bottom refractory material, ensure that the material is filled to the level of the upper surface of the base brick.

[0013] After baking, clean the holes in the base bricks and tighten the vent plugs using the vent plug installation tool. After trial installation and alignment, apply fire putty evenly to the outside of the vent plugs and tap them so that their bottoms press against the mounting plate.

[0014] Align the IPV mechanism bridge with the upper pressure plate on the intake pipe, slide the T-shaped fastening bolts inward, and tighten the nuts on both sides evenly with a wrench to a torque greater than 100 N·m, so that the IPV mechanism bridge presses against the graphite gasket.

[0015] S2, Online Use and Monitoring Phase

[0016] After each heat of steel is poured, the working surface of the vent plug is cleaned by oxygen burning. During the operation, high-pressure argon gas is first introduced, and then the residual steel residue is blown away with an oxygen lance. After the gas is burned through, the gas valve is immediately closed. After cleaning, the erosion depth of the vent plug is measured and recorded.

[0017] S3, Hot Replacement Stage

[0018] When the vent plug is corroded beyond the standard or becomes blocked and needs to be replaced by heat, the ladle is taken off the production line to a designated area, the fire mud layer is broken, and the vent plug is removed.

[0019] S4, Offline Maintenance Phase

[0020] Remove the IPV mechanism and send it to the maintenance room. Disassemble the IPV mechanism according to the procedure, check whether the mounting plate is deformed, clean the valve body and valve liner, replace the filter screen and all gaskets, reassemble the valve cover and bridge body, and tighten them with hex bolts.

[0021] Furthermore, in step S1, a layer of fire putty approximately 6 mm thick is evenly applied to the outside of the vent plug, and the bottom is tapped to press against the mounting plate.

[0022] Furthermore, in step S1, the seat brick is fixed on the mounting plate, the vent plug is tightened by the vent plug installation tool, and after trial installation and alignment, fire clay of about 6mm thickness is evenly applied to the outside of the vent plug.

[0023] Install a mica tube and a protective cap on the vent plug inlet pipe, apply fire clay to the upper surface and outer perimeter of the pad brick, place it in the seat brick recess, tap it into place, insert the upper pressure plate along the vent plug inlet pipe, and place a graphite sealing gasket in its recess.

[0024] Further, in S1, the IPV mechanism bridge is aligned with the groove of the upper pressure plate, the T-shaped fastening bolt is slid inward, and the nuts on both sides are tightened evenly with a wrench to a torque greater than 100 N·m, so that the convex ring on the IPV mechanism bridge presses against the graphite gasket. The vent plug air inlet pipe is connected to the air source pipeline, purged and leak checked, and after confirming that there are no problems, the heat shield is installed.

[0025] Furthermore, argon gas at 1.2-2 MPa is introduced into S2.

[0026] Furthermore, in step S3, after cleaning the working surface according to the procedure, the heat shield, hose, IPV mechanism and upper pressure plate are disassembled, and the pad brick pulling tool is screwed into the bottom threaded hole of the pad brick to remove it;

[0027] The specific operation is as follows: Use a hydraulic pulling tool to screw the pulling head into the bottom thread of the vent plug, install the clamp plate to hold the mounting plate, connect the hydraulic cylinder to apply pressure until the fire clay layer is broken, and safely remove the vent plug.

[0028] Furthermore, in the hot patching operation of S3, under the condition that the ladle temperature is >600℃, the eroded area between the vent plug and the seat brick is quickly filled with a well-mixed water-added hot patching material within 3 hours to ensure a dense filling.

[0029] An application of an IPV integration method for a ladle bottom blowing system is presented, which is applied to the installation, operation, and hot replacement of vent plugs. This enables precise, rapid, and safe installation and replacement of vent plugs, ensuring zero leakage during the blowing process and establishing a standardized equipment maintenance procedure.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] This invention realizes a complete set of standardized operating procedures and processes, from cold installation and online use (oxygen blowing cleaning, erosion measurement) to hot replacement (hydraulic pull-out removal, hot patching for rapid repair).

[0032] This invention improves the safety and efficiency of the heat exchange process and hydraulic pulling tools, making online replacement of the vent plug safer and faster, with a target completion time of 3 hours, reducing unplanned ladle downtime.

[0033] The installation process of this invention reduces mechanical damage to the seat bricks and mounting plates, enables timely detection and handling of potential faults, and extends the overall service life of the IPV mechanism.

[0034] This invention transforms operations that rely on personal experience into standardized and reproducible technical procedures, reducing operational difficulty and ensuring process stability and product quality consistency.

[0035] This invention reduces costs, minimizes damage to refractory materials and mechanisms caused by leaks and misoperations, and lowers spare parts consumption and maintenance costs. Attached Figure Description

[0036] Figure 1 This is a plan view of the PV mechanism bridge and mounting plate of the present invention;

[0037] Figure 2 This is a schematic diagram of the IPV mechanism bridge of the present invention;

[0038] Figure 3 This is a schematic diagram of the mounting plate of the present invention;

[0039] Figure 4 This is a schematic diagram of the mounting plate and the upper pressure plate of the present invention. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Specific Implementation Example 1

[0044] An IPV integration method for a ladle bottom blowing system specifically includes the following steps:

[0045] S1, Cold Installation Stage

[0046] Precisely fix the base brick onto the mounting plate. When tying the bottom refractory material, ensure that the material is filled to the level of the upper surface of the base brick. After baking, clean the holes in the base brick and tighten the vent plug using the vent plug installation tool. After trial installation and alignment, evenly apply about 6mm thick fire putty to the outside of the vent plug and tap it so that its bottom is against the mounting plate. Install the mica tube and protective cap on the vent plug inlet pipe. Apply fire putty to the upper surface and outer perimeter of the base brick, place it into the base brick recess, and tap it into place. Slide the upper pressure plate along the vent plug inlet pipe and place a graphite sealing gasket in its recess. The graphite gasket is pressed tightly by the inner protrusion of the IPV mechanism bridge to form a reliable seal and force that a new gasket must be replaced every time a new vent plug is installed to prevent leakage caused by reuse of the gasket.

[0047] Align the IPV mechanism bridge with the groove on the upper pressure plate, slide the T-shaped fastening bolts inward, and tighten the nuts on both sides evenly with a wrench to a torque greater than 100 N·m, so that the convex ring on the IPV mechanism bridge presses against the graphite gasket. Connect the vent plug air inlet pipe to the air source pipeline, purge and check for leaks, and install the heat shield after confirming that there are no problems.

[0048] S2, Online Use and Monitoring Phase

[0049] After each heat of steel is poured, the working surface of the vent plug is cleaned by oxygen burning. During the operation, high-pressure argon gas of 1.2-2 MPa is first introduced, and then the residual steel residue is blown away with an oxygen lance. After the gas is burned through, the gas valve is immediately closed. After cleaning, the erosion depth of the vent plug is measured and recorded.

[0050] S3, Hot Replacement Stage

[0051] When the vent plug is corroded beyond the standard or becomes blocked and needs to be replaced by heat, the ladle is taken off the production line to a designated area, the fire mud layer is broken, and the vent plug is removed.

[0052] When the vent plug is corroded beyond the standard or becomes blocked and requires heat replacement, after the ladle is taken off the line to the designated area, the working surface is purged and cleaned according to the procedure. Then, the heat shield, hose, IPV mechanism and upper pressure plate are disassembled. The pad brick pulling tool is screwed into the threaded hole at the bottom of the pad brick and removed.

[0053] The specific operating method is as follows: use a hydraulic pulling tool, screw the pulling head into the bottom thread of the vent plug, install the clamp plate to hold the mounting plate, connect the hydraulic cylinder to apply pressure until the fire clay layer is broken, and safely remove the vent plug.

[0054] Hot patching operation: Under the condition that the ladle temperature is >600℃ (red ladle), within 3 hours, use the mixed water-added hot patching material to quickly fill the eroded area between the vent plug and the seat brick to ensure that the filling is dense.

[0055] S4, Offline Maintenance Phase

[0056] Remove the IPV mechanism and send it to the maintenance room. Disassemble the IPV mechanism according to the procedure, check whether the mounting plate is deformed, clean the valve body and valve liner, replace the filter screen and all gaskets, reassemble the valve cover and bridge body, and tighten them with hex bolts.

[0057] In the above embodiments, such as Figure 1-4As shown, mounting plate 1 is a circular structure. Mounting plate 1 is free from deformation. A stepped hole 3 for mounting the upper pressure plate 2 is provided at the center of mounting plate 1. The assembled valve body and valve liner 4 (both valve body and valve liner have bolt holes evenly distributed around their circumference) are placed into the IPV mechanism bridge. The filter screen is placed inside the valve cover. The valve cover 5 (with bolt holes evenly distributed around its circumference, a mounting groove on the upper part of the valve cover for placing the filter screen, a hollow lower part with a central hole at its center, and bolt connection holes evenly distributed on its circumference) is then placed... The IPV structure bridge is fixed with hexagonal bolts. The assembled IPV structure bridge is centered and installed on the mounting plate 1. T-shaped fastening bolt slots 6 are opened on both sides of the mounting plate 1. T-shaped fastening bolts 7 are placed into the T-shaped fastening bolt slots 6 and locked. The bridge arm 8 of the IPV structure bridge has a reverse open slot 9 fixed at the end position to cooperate with the T-shaped fastening bolt. A clip is installed in the T-shaped fastening bolt slot 6. The clip is adapted to the T-shaped fastening bolt slot 6. The heat shield is fastened on the IPV structure bridge (fixed by pin). Specific Implementation Example 2

[0059] An application of an IPV integration method for a ladle bottom blowing system is presented, which is applied to the installation, operation, and hot replacement of vent plugs. This enables precise, rapid, and safe installation and replacement of vent plugs, ensuring zero leakage during the blowing process and establishing a standardized equipment maintenance procedure.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for integrating IPV (Integrated Product Value) into a ladle bottom blowing system, characterized in that, Specifically, the following steps are included: S1, Cold Installation Stage When fixing the base brick precisely onto the mounting plate and tying the bottom refractory material, ensure that the material is filled to the level of the upper surface of the base brick. After baking, clean the holes in the base bricks and tighten the vent plugs using the vent plug installation tool. After trial installation and alignment, apply fire putty evenly to the outside of the vent plugs and tap them so that their bottoms press against the mounting plate. Align the IPV mechanism bridge with the upper pressure plate on the intake pipe, slide the T-shaped fastening bolts inward, and tighten the nuts on both sides evenly with a wrench to a torque greater than 100 N·m, so that the IPV mechanism bridge presses against the graphite gasket. S2, Online Use and Monitoring Phase After each heat of steel is poured, the working surface of the vent plug is cleaned by oxygen burning. During the operation, high-pressure argon gas is first introduced, and then the residual steel residue is blown away with an oxygen lance. After the gas is burned through, the gas valve is immediately closed. After cleaning, the erosion depth of the vent plug is measured and recorded. S3, Hot Replacement Stage When the vent plug is corroded beyond the standard or becomes blocked and needs to be replaced by heat, the ladle is taken off the production line to a designated area, the fire mud layer is broken, and the vent plug is removed. S4, Offline Maintenance Phase Remove the IPV mechanism and send it to the maintenance room. Disassemble the IPV mechanism according to the procedure, check whether the mounting plate is deformed, clean the valve body and valve liner, replace the filter screen and all gaskets, reassemble the valve cover and bridge body, and tighten them with hex bolts.

2. The IPV integration method for a ladle bottom blowing system according to claim 1, characterized in that, In step S1, a 6mm thick layer of fire clay is evenly applied to the outside of the vent plug, and then tapped so that its bottom is pressed against the mounting plate.

3. The IPV integration method for a ladle bottom blowing system according to claim 2, characterized in that, In step S1, the seat brick is fixed on the mounting plate, the vent plug is tightened by the vent plug installation tool, and after trial installation and alignment, fire clay of about 6mm thickness is evenly applied to the outside of the vent plug. Install a mica tube and a protective cap on the vent plug inlet pipe, apply fire clay to the upper surface and outer perimeter of the pad brick, place it in the seat brick recess, tap it into place, insert the upper pressure plate along the vent plug inlet pipe, and place a graphite sealing gasket in its recess.

4. The IPV integration method for a ladle bottom blowing system according to claim 3, characterized in that, In S1, the IPV mechanism bridge is aligned with the groove of the upper pressure plate, the T-shaped fastening bolt is slid inward, and the nuts on both sides are tightened evenly with a wrench to a torque greater than 100 N·m, so that the convex ring on the IPV mechanism bridge presses against the graphite gasket. The vent plug air inlet pipe is connected to the air source pipeline, purged and leak checked, and the heat shield is installed after confirming that there are no problems.

5. The IPV integration method for a ladle bottom blowing system according to claim 4, characterized in that, Argon gas at 1.2-2 MPa is introduced into S2.

6. The IPV integration method for a ladle bottom blowing system according to claim 5, characterized in that, After cleaning the working surface according to the procedure in S3, disassemble the heat shield, hose, IPV mechanism and upper pressure plate, and use the pad brick pulling tool to screw into the bottom threaded hole of the pad brick to remove it. The specific operation is as follows: Use a hydraulic pulling tool to screw the pulling head into the bottom thread of the vent plug, install the clamp plate to hold the mounting plate, connect the hydraulic cylinder to apply pressure until the fire clay layer is broken, and safely remove the vent plug.

7. The IPV integration method for a ladle bottom blowing system according to claim 6, characterized in that, In the S3 hot patching operation, under the condition that the ladle temperature is >600℃, the eroded area between the vent plug and the seat brick is quickly filled with a well-mixed water-added hot patching material within 3 hours to ensure a dense filling.

8. An application of the IPV integration method for a ladle bottom blowing system according to claim 7, characterized in that, The IPV integration method of the ladle bottom blowing system is applied to the installation, operation, and hot replacement of the vent plug, so as to achieve accurate, fast, and safe installation and replacement of the vent plug, ensure zero leakage during the blowing process, and establish a standardized equipment maintenance process.

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