Method for detecting air permeability of steel ladle air brick

Abstract

The invention discloses a method for detecting the air permeability of a steel ladle air brick. The method comprises the following steps: introducing combustible gas into an air inlet pipeline of the steel ladle air brick; acquiring a flame state generated on the surface of the steel ladle air brick; judging the air permeability of the steel ladle air brick according to the flame state; if the flame state is continuous and vigorous, judging that the air permeability of the steel ladle air brick is good; if the flame state is weak or discontinuous, judging that the air permeability of the steel ladle air brick is poor; and if the flame state is that no flame is generated, determining that the air holes of the steel ladle air brick are completely blocked and the air permeability is lost. The combustible gas is propane. Visual judgment of the air permeability of the steel ladle air brick is achieved by introducing combustible gas for combustion, the operation process is extremely simple, complex equipment and professional skills are not needed, and common personnel can quickly complete inspection; the judgment mode is visual and reliable, the air permeability is directly reflected through the flame state, the subjectivity and one-sidedness of traditional judgment depending on hearing or experience are overcome, and the detection accuracy is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of argon blowing for steel ladle, and particularly to a method for testing the gas permeability of a gas permeable brick of a steel ladle. BACKGROUND

[0002] In the steelmaking process, the bottom argon blowing technology for a steel ladle is one of the key links to ensure the quality of molten steel, and the gas permeability of the gas permeable brick of the steel ladle directly determines whether the argon can be uniformly and stably passed into the molten steel, thereby affecting the stirring effect, composition uniformity and inclusion removal efficiency of the molten steel. If the gas permeable brick of the steel ladle is blocked or has a reduced gas permeability, it will not only result in an unqualified molten steel treatment quality, but also may cause abnormal pressure in the steel ladle due to poor gas flow, thereby increasing the risk of production accidents such as molten steel spatter and equipment damage. Therefore, the accurate and efficient testing of the gas permeability of the gas permeable brick of the steel ladle is an important process indispensable in the steelmaking production process.

[0003] At present, the testing of the gas permeability of the gas permeable brick of the steel ladle in the industry mainly relies on two traditional technical solutions. The first solution is to blow the surface of the gas permeable brick of the steel ladle by a coal-oxygen gun, and after the surface impurities are cleaned, whether there is residual steel slag or molten steel on the surface of the gas permeable brick and around it is visually observed by the post personnel, so as to indirectly judge whether the gas permeable brick is blocked. However, this solution has obvious limitations: on the one hand, the blowing operation of the coal-oxygen gun needs to accurately control the position and blowing force of the gun head, which is difficult to operate, and the gas permeable brick surface is easily damaged during the blowing process; on the other hand, the visual judgment completely depends on the subjective experience of personnel, and in the poor lighting environment of the steelmaking workshop, it is difficult to accurately identify the traces of residual steel slag or gas hole blockage, and the judgment standards of different personnel also cause poor consistency of the test results and high misjudgment rate. The second traditional solution is to connect a fixed pressure nitrogen gas to the gas permeable brick of the steel ladle, and to confirm the gas permeability by listening to the volume of the nitrogen gas blown out of the gas permeable brick by the post personnel. Generally, the larger the volume, the better the gas permeability. However, this solution also has significant defects: firstly, the nitrogen gas inlet needs to strictly control the stable pressure, and if the pressure fluctuates, it will directly affect the accuracy of the volume judgment, increasing the complexity of the operation; secondly, there are many strong noise sources such as converter smelting and equipment operation in the steelmaking workshop, which seriously interfere with the identification of the volume of the nitrogen gas blown out, making it difficult for personnel to clearly capture the effective sound signals; thirdly, the judgment of the volume lacks objective quantitative standards and completely depends on the hearing sensitivity and operation experience of personnel, and for newly employed or inexperienced post personnel, misjudgment is likely to occur, and the actual gas permeability of the gas permeable brick cannot be reliably identified.

[0004] In summary, existing testing technologies generally suffer from problems such as high operational difficulty, high reliance on experience, subjective and one-sided judgment, and low testing accuracy. These technologies are insufficient to meet the needs of steelmaking production for rapid and accurate testing of the permeability of ladle permeable bricks. There is an urgent need for a technical solution that can overcome these limitations and achieve intuitive, simple, efficient, and accurate testing to ensure the safety of steelmaking production and the stability of molten steel quality. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a method for testing the air permeability of steel ladle permeable bricks, aiming to solve the problems of high operational difficulty, high dependence on experience, subjective and one-sided judgment, and low accuracy of existing testing techniques.

[0006] The technical solution adopted by this invention to solve its technical problem is: a method for testing the air permeability of steel ladle permeable bricks, comprising the following steps: introducing combustible gas into the air inlet pipe of the steel ladle permeable brick; obtaining the flame state generated on the surface of the steel ladle permeable brick; and judging the air permeability of the steel ladle permeable brick based on the flame state. By directly reflecting the air permeability through the flame state, the subjectivity and one-sidedness of traditional methods relying on auditory or experience-based judgment are overcome, greatly improving the accuracy of the test.

[0007] As a further improvement of the present invention: the method of judging the air permeability of the ladle permeable brick based on the flame state includes: if the flame state is continuous and vigorous, the air permeability of the ladle permeable brick is judged to be good; if the flame state is weak or intermittent, the air permeability of the ladle permeable brick is judged to be poor; if the flame state does not produce a flame, the pores of the ladle permeable brick are judged to be completely blocked, and the air permeability is lost. By transforming the judgment criteria for air permeability into three easily identifiable flame states, it is clearly stated that continuous and vigorous flame, weak or intermittent flame, and no flame correspond to good, poor, and lost air permeability, respectively. This avoids the subjective differences of traditional visual inspection of steel slag and sound identification, and greatly reduces the difficulty and subjective arbitrariness of judgment.

[0008] As a further improvement of the present invention: the combustible gas is propane. Compared with other combustible gases, propane is safer, burns more stably in the high-temperature environment of steelmaking workshops, and is less prone to explosions and other dangers.

[0009] As a further improvement of the present invention: when the combustible gas is introduced into the inlet pipe of the permeable brick in the ladle, the inlet pressure of the combustible gas is 0.2 to 0.4 MPa. This pressure range can ensure that the combustible gas passes stably through the inlet pipe and vent of the permeable brick, avoiding both excessively low pressure leading to poor gas flow and weak flame that is difficult to observe, and excessively high pressure causing excessively fast gas flow and violent combustion of the flame, thus preventing safety risks.

[0010] As a further improvement of the present invention: the main pipeline of the combustible gas is connected to the inlet pipeline of the permeable brick in the ladle via a flexible hose. The connection between the main pipeline of the combustible gas and the inlet pipeline of the permeable brick in the ladle is highly flexible, as the hose can flexibly adapt to positional deviations between the two pipelines, eliminating the need for strict alignment of rigid pipes and reducing the difficulty of on-site connection operations. This is particularly suitable for scenarios where the position of the ladle in a steelmaking workshop may require minor adjustments.

[0011] As a further improvement of the present invention: the hose is a high-pressure resistant metal hose. By selecting a high-pressure resistant metal hose to connect the main combustible gas pipeline and the gas inlet pipeline of the steel ladle permeable brick, it can withstand the propane inlet pressure of 0.2-0.4 MPa, avoiding hose damage and leakage due to pressure, and ensuring the safety of gas transportation; the metal material is resistant to the high temperature and dust environment of the steelmaking workshop, has strong material stability, is not easy to corrode or age, extends the service life of the hose, and reduces the frequency of replacement; it retains the adaptability of the hose connection position, which is convenient for on-site operation, and is more robust than ordinary hoses, reducing the risk of damage caused by accidental collisions, etc., and takes into account both flexibility and reliability to ensure the continuous stability of the gas transportation path.

[0012] As a further improvement of the present invention: the hose is equipped with a pipeline valve for controlling the on / off of combustible gas, and the pipeline valve is installed at one end of the hose near the main combustible gas pipeline. The pipeline valve at the end of the hose near the main combustible gas pipeline controls the gas flow, allowing personnel to operate the valve directly near the gas source. This facilitates convenient gas control without needing to be near the high-temperature area of ​​the ladle, reducing operational safety risks and eliminating the hassle of remote gas control. Secondly, the pipeline valve's proximity to the main pipeline allows for rapid gas cut-off, ensuring high safety. In case of emergencies such as hose leakage, gas delivery can be terminated promptly, reducing the risk of escalation. The direct and efficient operation of the pipeline valve before and after inspection avoids gas waste and ensures controllable gas introduction timing for each inspection, guaranteeing accurate testing. Combined with pressure control, this stabilizes the flame state and improves the reliability of permeability assessment.

[0013] As a further improvement of the present invention: the pipeline valve is a ball valve. A ball valve is selected for the pipeline valve located near the main combustible gas pipeline via a flexible hose. The ball valve adopts a rotary opening and closing structure, requiring only a 90° rotation to complete the on / off operation. This makes it convenient and efficient, faster than traditional valves, allowing personnel to quickly control the flow and cut off of combustible gases (such as propane), meeting the needs of efficient inspection in steelmaking production. Furthermore, the ball valve's valve core and seat fit tightly, providing excellent sealing and effectively preventing propane leakage, thus avoiding safety hazards caused by gas leaks and ensuring the safety of the inspection process.

[0014] As a further improvement of the present invention: the hose is connected to the air inlet pipe of the ladle permeable brick via a quick connector. The quick connector enables rapid connection between the hose and the air inlet pipe, resulting in high connection efficiency and eliminating the need for complex threading operations, significantly reducing connection time for operators. Furthermore, it lowers the skill requirements for operators, allowing even less experienced staff to easily complete the connection, simplifying operation and reducing operational errors.

[0015] As a further improvement of the present invention, the quick connector is made of stainless steel. By using stainless steel, the quick connector is made of materials that are resistant to high temperatures, dust, and potential corrosive substances in the workshop, making it less prone to rusting or aging. This ensures long-term structural stability, extends the service life of the quick connector, and reduces the frequency of replacement. Secondly, it guarantees a tight seal; the excellent hardness and stability of stainless steel allow the male and female connectors to fit together tightly during mating, preventing flammable gas leakage and ensuring safe gas delivery.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention has the advantages of simple operation, low reliance on experience, high inspection efficiency, high safety, and high judgment accuracy. It only requires introducing combustible gas and observing the flame, eliminating the need for complex equipment operation, thus reducing the difficulty of operation. The flame state directly reflects the permeability performance, making the judgment intuitive and requiring no reliance on the experience of the personnel. Both new and experienced employees can make accurate judgments, resulting in low reliance on experience. It eliminates the tedious steps of traditional purging and listening, quickly completing the inspection and achieving high inspection efficiency. By using propane as the combustible gas, it offers high safety and reduces usage risks. It avoids the subjective bias of traditional visual inspection and listening, reducing misjudgments, achieving high judgment accuracy, and effectively preventing production accidents caused by blockage of the permeable bricks.

[0018] 2. This invention transforms the criteria for judging air permeability into three easily identifiable flame states. A continuous and vigorous flame, a weak or intermittent flame, and no flame correspond to good, poor, and lost air permeability, respectively. This avoids the subjective differences inherent in traditional methods of visually inspecting steel slag and listening to sounds, greatly reducing the difficulty and arbitrariness of judgment. No extensive experience is required for personnel; both new and experienced employees can quickly grasp the judgment logic, making it easy to understand and operate. The clear correspondence between flame states and air permeability significantly improves judgment accuracy, effectively identifies blockages in permeable bricks, reduces production accidents caused by misjudgments, significantly improves production safety and maintenance efficiency, and ensures safe steelmaking production.

[0019] 3. The combustible gas used in this invention is propane. Compared to other combustible gases, propane is safer and burns more stably in the high-temperature environment of the steelmaking workshop, making it less prone to explosions and other dangers. Secondly, propane is flammable and its ignition point is lower than the high temperature inside the ladle, allowing it to pass smoothly through the pores of the permeable bricks and ignite immediately after entering the ladle, ensuring that personnel can judge the permeability performance by observing the flame. At the same time, propane is easily and stably transported through components such as hoses and ball valves, and its gas properties are stable, making it less likely to affect the combustion effect due to changes in composition during transportation, thus ensuring a smooth inspection process and accurate judgment. Attached Figure Description

[0020] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0022] Please see Figure 1 A method for testing the air permeability of steel ladle permeable bricks includes the following steps:

[0023] Combustible gas is introduced into the air inlet pipe of the steel ladle permeable brick;

[0024] Obtain the flame state generated on the surface of the permeable brick in the ladle;

[0025] The permeability of steel ladle permeable bricks can be determined based on the flame condition.

[0026] By introducing the combustion of combustible gas, the permeability performance of steel ladle permeable bricks can be visually judged. The operation process is extremely simple, requiring no complex equipment or professional skills, and ordinary personnel can quickly complete the inspection. The judgment method is intuitive and reliable, directly reflecting the permeability performance through the flame state, overcoming the subjectivity and one-sidedness of traditional judgments based on hearing or experience, and greatly improving the accuracy of the test.

[0027] In some embodiments, determining the air permeability of the ladle permeable brick based on the flame state includes:

[0028] If the flame is continuous and vigorous, it is determined that the air permeability of the steel ladle permeable brick is good.

[0029] If the flame is weak or intermittent, the air permeability of the steel ladle permeable brick is considered to be poor.

[0030] If no flame is produced, it is determined that the pores of the steel ladle permeable brick are completely blocked, and the permeability is lost.

[0031] By transforming the criteria for judging permeability into three easily identifiable flame states—continuous and vigorous flame, weak or intermittent flame, and no flame—corresponding to good, poor, and lost permeability, respectively, this method avoids the subjective differences inherent in traditional methods of visually inspecting steel slag and listening to sounds, significantly reducing the difficulty and arbitrariness of judgment. No extensive experience is required for staff; both new and experienced employees can quickly grasp the judgment logic, making it easy to understand and operate. The clear correlation between flame states and permeability significantly improves judgment accuracy, effectively identifies blockages in permeable bricks, reduces production accidents caused by misjudgments, and significantly enhances production safety and maintenance efficiency, ensuring safe steelmaking production.

[0032] In some embodiments, the combustible gas is propane.

[0033] Compared to other flammable gases, propane is safer and burns more stably in the high-temperature environment of steelmaking workshops, making it less prone to explosions and other dangers. Secondly, propane is flammable and its flash point (approximately 450°C) is lower than the high temperature inside the ladle, allowing it to easily pass through the pores of the permeable bricks and ignite immediately upon entering the ladle, ensuring that personnel can judge the permeability performance by observing the flame. At the same time, propane is easily and stably transported through components such as hoses and ball valves, and its gas properties are stable, making it less likely for compositional changes during transportation to affect the combustion effect, thus ensuring a smooth inspection process and accurate judgment.

[0034] In some embodiments, when the combustible gas is introduced into the air inlet pipe of the steel ladle permeable brick, the inlet pressure of the combustible gas is 0.2 to 0.4 MPa.

[0035] By setting the inlet pressure of combustible gas to 0.2–0.4 MPa, this pressure range ensures that combustible gas (such as propane) can stably pass through the inlet pipe and pores of the permeable brick. This avoids both excessively low pressure leading to poor gas flow and weak, difficult-to-observe flames, and excessively high pressure causing safety risks such as excessively fast gas flow and violent combustion. Secondly, the stable inlet pressure makes the differences in flame state produced by permeable bricks with different permeability performance clearer, making it easier for personnel to accurately judge the permeability performance based on the flame condition, reducing misjudgments caused by pressure fluctuations, ensuring the accuracy of judgment, and further improving the reliability of inspection.

[0036] In some embodiments, the main pipeline of the combustible gas is connected to the inlet pipeline of the steel ladle permeable brick via a flexible hose.

[0037] The main combustible gas pipeline is connected to the gas inlet pipeline of the steel ladle permeable brick using a flexible hose. This connection offers high flexibility, as the hose can adapt to positional deviations between the two pipelines without requiring strict alignment with rigid pipes. This reduces the difficulty of on-site connection operations, making it particularly suitable for scenarios where the position of the steel ladle in a steelmaking workshop may require minor adjustments. Secondly, the hose's soft texture facilitates operation and disassembly, allowing personnel to quickly complete the connection and subsequent disassembly and storage after inspection, eliminating the cumbersome steps of rigid pipe connections. The hose can also buffer stress caused by minor vibrations or positional changes, reducing damage to the pipeline and avoiding the interface wear that is prone to occur with rigid pipe connections, thus ensuring the sealing and stability of the gas transmission path.

[0038] In some embodiments, the hose is a high-pressure resistant metal hose.

[0039] By selecting high-pressure resistant metal hoses to connect the main combustible gas pipeline and the gas inlet pipeline of the steel ladle permeable brick, it can withstand the propane inlet pressure of 0.2-0.4MPa, avoiding hose damage and leakage due to pressure, and ensuring the safety of gas transportation. The metal material is resistant to the high temperature and dust environment of the steelmaking workshop, has strong material stability, is not easy to corrode or age, extends the service life of the hose, and reduces the frequency of replacement. It retains the adaptability of the hose connection position, which is convenient for on-site operation, and is more robust than ordinary hoses, reducing the risk of damage caused by accidental collisions, etc. It balances flexibility and reliability, and ensures the continuous stability of the gas transportation path.

[0040] In some embodiments, the hose is provided with a pipe valve for controlling the on / off of combustible gas, the pipe valve being installed at one end of the hose near the main pipe of the combustible gas.

[0041] A valve is installed at the end of the hose closest to the main combustible gas pipeline to control gas flow. Personnel can operate the valve directly near the gas source, making gas control convenient and eliminating the need to approach the high-temperature area of ​​the ladle, reducing operational safety risks and avoiding the hassle of remote gas control. Secondly, the valve's proximity to the main pipeline allows for rapid gas cut-off, ensuring high safety. In case of hose leaks or other emergencies, gas delivery can be stopped promptly, minimizing the risk of further escalation. The valve operation before and after inspection is direct and efficient, avoiding gas waste and ensuring controllable gas introduction timing for each inspection, guaranteeing accurate testing. Combined with pressure control, this stabilizes the flame and improves the reliability of permeability assessment.

[0042] In some embodiments, the pipeline valve is a ball valve.

[0043] Ball valves are selected for the pipe valves located near the main combustible gas pipeline via the flexible hose. These ball valves employ a rotary opening and closing structure, requiring only a 90° rotation to open or close the valve. This convenient and efficient operation, faster than traditional valves, allows personnel to quickly control the flow and cut off of combustible gases (such as propane), meeting the high-efficiency inspection needs of steelmaking production. Furthermore, the tight fit between the valve core and seat ensures excellent sealing, effectively preventing propane leakage and avoiding safety hazards caused by gas leaks, thus guaranteeing a safe inspection process.

[0044] In some embodiments, the hose is connected to the air inlet pipe of the steel ladle permeable brick via a quick connector.

[0045] The hose connects to the air inlet pipe of the steel ladle permeable brick via a quick connector. The quick connector enables rapid connection between the hose and the air inlet pipe of the steel ladle permeable brick, resulting in high connection efficiency and eliminating the need for complex threading operations, significantly reducing the connection time for operators. Secondly, it reduces the skill requirements for operators, allowing even less experienced employees to easily complete the connection, making operation convenient and reducing operational errors. At the same time, after inspection, the hose can be quickly separated from the air inlet pipe, facilitating hose storage and subsequent reuse.

[0046] In some embodiments, the quick connector is made of stainless steel.

[0047] The quick couplings are made of stainless steel, which is resistant to high temperatures, dust, and potential corrosive substances in the workshop. It is not prone to rust or aging, maintaining structural stability over a long period, extending the service life of the quick couplings, and reducing replacement frequency. Secondly, it ensures a tight seal; the excellent hardness and stability of stainless steel allow the male and female connectors to fit together tightly during connection, preventing leakage of flammable gases (such as propane) and ensuring safe gas delivery. Simultaneously, stainless steel is impact-resistant, wear-resistant, and has high structural reliability, able to withstand the operational forces during hose connection and disassembly, reducing the risk of connector damage and ensuring a stable connection during each inspection. This provides a stable guarantee for observing flame conditions and judging gas permeability.

[0048] The main functions of this invention are:

[0049] This invention achieves visualized assessment of the permeability of permeable bricks in steel ladles by introducing combustible gas combustion. It transforms the traditional abstract judgment relying on hearing and experience into intuitive flame observation, significantly reducing operational difficulty and the skill threshold for personnel. The method employs clear and graded judgment criteria, quickly and accurately distinguishing between good permeability, slight blockage, and complete blockage, effectively preventing misjudgments and omissions, and ensuring high reliability. Furthermore, the use of gases such as propane balances effectiveness and safety. The entire method is simple, low-cost, requires no complex equipment, and can be efficiently integrated into existing processes, significantly improving the safety and production efficiency of steel ladle operations and fundamentally preventing production accidents caused by permeable brick blockage.

[0050] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this invention and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units can be integrated into a single processing unit, or each unit can exist physically separately, or two or more units can be integrated into a single unit.

[0051] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0052] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for testing the air permeability of steel ladle permeable bricks, characterized in that: Includes the following steps: Combustible gas is introduced into the air inlet pipe of the steel ladle permeable brick; Obtain the flame state generated on the surface of the permeable brick in the ladle; The permeability of steel ladle permeable bricks can be determined based on the flame condition.

2. The method for testing the air permeability of steel ladle permeable bricks according to claim 1, characterized in that: The method of determining the air permeability of steel ladle permeable bricks based on flame state includes: If the flame is continuous and vigorous, it is determined that the air permeability of the steel ladle permeable brick is good. If the flame is weak or intermittent, the air permeability of the steel ladle permeable brick is considered to be poor. If no flame is produced, it is determined that the pores of the steel ladle permeable brick are completely blocked, and the permeability is lost.

3. A method for testing the air permeability of a steel ladle permeable brick according to claim 1 or 2, characterized in that: The combustible gas is propane.

4. The method for testing the air permeability of steel ladle permeable bricks according to claim 1, characterized in that: The main pipeline of the combustible gas is connected to the air inlet pipeline of the steel ladle permeable brick via a flexible hose.

5. The method for testing the air permeability of steel ladle permeable bricks according to claim 4, characterized in that: The hose is a high-pressure resistant metal hose.

6. The method for testing the air permeability of steel ladle permeable bricks according to claim 4, characterized in that: The hose is equipped with a pipe valve for controlling the flow of combustible gas, and the pipe valve is installed at one end of the hose near the main pipe of combustible gas.

7. The method for testing the air permeability of steel ladle permeable bricks according to claim 6, characterized in that: The pipeline valve is a ball valve.

8. The method for testing the air permeability of steel ladle permeable bricks according to claim 4, characterized in that: The hose is connected to the air inlet pipe of the steel ladle permeable brick via a quick connector.

9. The method for testing the air permeability of steel ladle permeable bricks according to claim 8, characterized in that: The quick connector is made of stainless steel.

10. The method for testing the air permeability of steel ladle permeable bricks according to claim 1, characterized in that: When the combustible gas is introduced into the air inlet pipe of the steel ladle permeable brick, the inlet pressure of the combustible gas is 0.2 to 0.4 MPa.

Images