A blast furnace hearth grouting method, system, device, and medium

Abstract

The application discloses a blast furnace hearth grouting method, system, device and medium, and relates to the technical field of metallurgical engineering. The method comprises the following steps: in the case that a protective layer is arranged in the furnace shell of a blast furnace hearth, controlling the blast furnace to perform a blow-off shutdown operation, so that the protective layer is cooled and shrunk until the temperature of the protective layer is reduced to below a preset temperature threshold and the protective layer is in a shrunk state, and the protective layer is formed based on refractory material; controlling the blast furnace hearth to perform air supply production according to target air pressure and target air volume, so that the furnace shell is expanded under the action of the target air pressure, the protective layer maintains the shrunk state under the action of the target air volume, and a grouting space is formed between the furnace shell and the protective layer; and grouting is performed on the grouting space.

Description

Technical Field

[0001] This application relates to the field of metallurgical engineering technology, and in particular to a blast furnace hearth grouting method, system, equipment and medium. Background Technology

[0002] Currently, the blast furnace, as the core equipment in steel production, plays a crucial role in storing slag and iron in its hearth. The blast furnace hearth occupies a critical position in the entire ironmaking process, enduring harsh environments of high temperature and pressure, while also suffering from chemical corrosion and the constant erosion of molten iron. After years of service, due to repeated thermal stress and the gradual accumulation of harmful elements, the hearth is prone to localized erosion. This erosion can further trigger a series of serious problems, such as furnace shell red-hot and gas leaks, and may even pose significant safety hazards to the entire production process.

[0003] However, the combined effects of high temperature and high pressure in the blast furnace hearth region cause deformation and expansion of both the outer shell and the inner refractory material. Specifically, during blast furnace blasting, the high pressure inside the furnace causes the shell to elastically deform and expand; while during blast furnace production, the high temperature transferred from the slag and iron within the hearth causes the refractory material to deform and expand. This deformation and expansion not only affects the normal structure and performance of the hearth but also accelerates its erosion rate, making the already severe hearth condition even more complex and dangerous. Therefore, how to create more space between the furnace shell and the refractory material for grouting, ensuring a dense and compact filling, has become a crucial issue that the steel industry urgently needs to address. Summary of the Invention

[0004] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] In a first aspect, embodiments of this application provide a blast furnace hearth grouting method, the method comprising:

[0006] When a protective layer is provided inside the hearth of a blast furnace, the blast furnace is controlled to perform a shutdown operation to cool down and shrink the protective layer until the temperature of the protective layer drops below a preset temperature threshold and it is in a contracted state. The protective layer is formed based on refractory material.

[0007] The blast furnace hearth is controlled to supply air according to the target air pressure and the target air volume, so that the furnace shell expands under the action of the target air pressure and the protective layer maintains the contracted state under the action of the target air volume, forming a slurry filling space between the furnace shell and the protective layer;

[0008] Grouting is performed into the grouting space.

[0009] In one embodiment of the present invention, before grouting the filling space, the method further includes:

[0010] The first deformation of the protective layer after cooling and shrinkage and the second deformation of the furnace shell after expansion are obtained.

[0011] Based on the first deformation amount and the second deformation amount, the size of the grouting space is determined, and the corresponding target grout volume is matched according to the size of the grouting space;

[0012] The grouting of the filling space includes:

[0013] Grouting is performed into the grouting space according to the target grout volume.

[0014] In one embodiment of the present invention, obtaining the first deformation amount of the protective layer after cooling and shrinkage includes:

[0015] Obtain the temperature drop of the protective layer;

[0016] Based on the cooling rate and the coefficient of thermal expansion, the first deformation of the protective layer after cooling and shrinkage is calculated.

[0017] In one embodiment of the present invention, obtaining the second deformation amount of the furnace shell after expansion includes:

[0018] Once the protective layer has cooled and shrunk, the stress in the blast furnace shell is determined based on the target air pressure, the inner diameter of the blast furnace shell, the thickness of the blast furnace shell, the weld coefficient, and the thin-shell theoretical model.

[0019] The strain of the blast furnace is obtained based on the ratio of the furnace shell stress to the elastic modulus of the furnace shell.

[0020] The second deformation of the furnace shell is obtained based on the product of the strain and the inner diameter of the furnace shell.

[0021] In one embodiment of the present invention, after the protective layer has cooled and shrunk, the stress of the blast furnace shell is determined based on the target wind pressure, the inner diameter of the blast furnace shell, the thickness of the blast furnace shell, the weld coefficient, and the thin-shell theoretical model. This determination is obtained by the following formula:

[0022]

[0023] Where σ is the furnace shell stress, P is the target air pressure, and D i δ is the inner diameter of the furnace shell. n The thickness of the furnace shell is φ, and the weld coefficient is φ.

[0024] In one embodiment of the present invention, determining the size of the grouting space based on the first deformation amount and the second deformation amount includes:

[0025] The first deformation amount is used to compensate for the second deformation amount to determine the size of the slurry filling space between the protective layer and the furnace shell.

[0026] In one embodiment of the present invention, the target wind pressure is greater than or equal to 0.45 MPa.

[0027] Secondly, this application proposes a blast furnace hearth grouting system, the system comprising: a first control module, a second control module, and a grouting execution module;

[0028] The first control module is configured to: when a protective layer is provided inside the furnace shell of the blast furnace hearth, control the blast furnace to perform a shutdown operation to cool and shrink the protective layer until the temperature of the protective layer drops below a preset temperature threshold and it is in a contracted state. The protective layer is formed based on refractory material.

[0029] The second control module is configured to: control the blast furnace hearth to produce air according to the target air pressure and the target air volume, so that the furnace shell expands under the action of the target air pressure, and the protective layer maintains the contracted state under the action of the target air volume, forming a slurry filling space between the furnace shell and the protective layer;

[0030] The grouting execution module is configured to grout the grouting space.

[0031] Thirdly, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program stored in the memory to implement the steps of a blast furnace hearth grouting method as described in any of the first aspects above.

[0032] Fourthly, this application also proposes a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of a blast furnace hearth grouting method according to any one of the first aspects.

[0033] In summary, the blast furnace hearth grouting method of this application, when a protective layer is provided inside the blast furnace shell, controls the blast furnace to perform a shutdown operation to cool and shrink the protective layer until its temperature drops below a preset temperature threshold and it is in a contracted state. The blast furnace hearth is then controlled to produce air according to target air pressure and target air volume, causing the furnace shell to expand under the target air pressure and the protective layer to maintain its contracted state under the target air volume. This creates a grouting space between the furnace shell and the protective layer, actively creating a controllable grouting space. This results in a denser filling, improved structural strength, and extended blast furnace service life. It also reduces localized furnace shell temperature, decreases the risk of burn-through, and improves operational safety. Furthermore, it allows for maintenance repairs without shutting down production, reducing downtime, avoiding material waste, lowering production costs, and ensuring stable blast furnace operation and enterprise profitability.

[0034] The blast furnace hearth grouting method proposed in this application, along with other advantages, objectives, and features of this application, will be partly apparent from the following description and partly understood by those skilled in the art through study and practice of this application. Attached Figure Description

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0036] Figure 1 This is a schematic flowchart of a blast furnace hearth grouting method provided in an embodiment of this application;

[0037] Figure 2 A schematic diagram of a blast furnace hearth grouting system provided in this application embodiment;

[0038] Figure 3 This is a schematic diagram of an electronic device for grouting a blast furnace hearth, provided as an embodiment of this application. Detailed Implementation

[0039] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0040] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0041] Please see Figure 1 This is a schematic diagram of a blast furnace hearth grouting method provided in an embodiment of this application, which may specifically include:

[0042] S110. When a protective layer is provided inside the furnace shell of the blast furnace hearth, the blast furnace is controlled to perform a shutdown operation to cool down and shrink the protective layer until the temperature of the protective layer drops below a preset temperature threshold and it is in a contracted state. The protective layer is formed based on refractory material.

[0043] For example, the blast furnace is first shut down, allowing the refractory protective layer inside the hearth to cool and shrink naturally until the temperature drops below a preset threshold and it reaches a contracted state. Specifically, during a blast furnace shutdown, the refractory material temperature drops from a high temperature to below the preset threshold, such as from 700℃ to 500℃. Due to thermal expansion and contraction, the diameter shrinks by 4.55mm. This diameter shrinkage is calculated based on a 100℃ temperature drop and the thermal expansion coefficient of the refractory material. By precisely controlling the cooling process, a predictable shrinkage of the refractory material is achieved, creating initial space for subsequent grouting.

[0044] S120. Control the blast furnace hearth to deliver air according to the target air pressure and target air volume, so that the furnace shell expands under the action of the target air pressure and the protective layer maintains the contracted state under the action of the target air volume, forming a slurry filling space between the furnace shell and the protective layer.

[0045] For example, the blast furnace is restarted, and the hearth is blasted according to the target air pressure and air volume, employing a special operating mode of high air pressure and low air volume. The high air pressure causes the furnace shell to expand outward, while the low air volume slows down the heating and expansion of the refractory material, thus creating a sufficiently large gap between the furnace shell and the protective layer, i.e., the slurry filling space. Utilizing the characteristic that "the rate of deformation under pressure is much higher than the rate of deformation under temperature," a superimposed space is created between the shrinkage of the refractory material and the expansion of the furnace shell, solving the problem of insufficient space in traditional methods.

[0046] S130. Grouting is performed into the grouting space.

[0047] For example, under the optimal grouting space conditions created above, grouting material is injected into the gap between the furnace shell and the protective layer. The refractory grouting material is injected into the grouting space, which compensates for the volatilization of volatiles and consolidation shrinkage of the grouting material, ensuring a final dense filling. This achieves void-free filling, effectively sealing gas passages, repairing eroded areas, and restoring the structural integrity of the furnace body.

[0048] In summary, the blast furnace hearth grouting method proposed in this application, when a protective layer is provided inside the blast furnace hearth shell, controls the blast furnace to perform a shutdown operation, causing the protective layer to cool and shrink until its temperature drops below a preset temperature threshold and it is in a contracted state. The blast furnace hearth is then controlled to produce air according to target air pressure and target air volume, causing the furnace shell to expand under the target air pressure and the protective layer to maintain its contracted state under the target air volume. This creates a grouting space between the furnace shell and the protective layer, actively creating a controllable grouting space. This results in a denser filling, improved structural strength, and extended blast furnace service life. It also reduces localized furnace shell temperature, decreases the risk of burn-through, and improves operational safety. Furthermore, it allows for maintenance repairs without shutting down production, reducing downtime, avoiding material waste, lowering production costs, and ensuring stable blast furnace operation and enterprise profitability.

[0049] In some examples, prior to grouting the filling space, the method further includes:

[0050] The first deformation of the protective layer after cooling and shrinkage and the second deformation of the furnace shell after expansion are obtained.

[0051] Based on the first deformation amount and the second deformation amount, the size of the grouting space is determined, and the corresponding target grout volume is matched according to the size of the grouting space;

[0052] The grouting of the filling space includes:

[0053] Grouting is performed into the grouting space according to the target grout volume.

[0054] For example, the blast furnace is shut down, allowing the protective layer inside the hearth (based on refractory material) to cool naturally. The refractory material temperature is monitored until it falls below a preset temperature threshold, typically 500-600℃. Once the temperature stabilizes, the shrinkage of the refractory material due to cooling is calculated—the first deformation. After the shrinkage stabilizes, the blast furnace is restarted with a target air pressure and volume. The target air volume is maintained below 60% of normal production. High air pressure causes elastic expansion of the furnace shell, while low air volume slows down the heating of the refractory material, preventing it from re-expanding.

[0055] Based on the first and second deformation values, sufficient grouting space is created, and the corresponding target grout volume is matched according to the size of the grouting space. When the grouting space reaches its maximum value, grouting is usually started into the grouting space according to the target grout volume within 30-60 minutes after air supply. By replacing empirical judgment with quantitative calculation, it is ensured that the grouting space is accurately matched to the material properties, avoiding material waste caused by insufficient space leading to incomplete filling or excessive space.

[0056] In some examples, obtaining the first deformation of the protective layer after cooling and shrinkage includes:

[0057] Obtain the temperature drop of the protective layer;

[0058] Based on the cooling rate and the coefficient of thermal expansion, the first deformation of the protective layer after cooling and shrinkage is calculated.

[0059] For example, high-temperature resistant thermocouples, such as K-type thermocouples, are arranged in different areas of the protective layer of the blast furnace hearth to monitor temperature changes in real time. During blast furnace shutdown, the temperature of the protective layer is slowly reduced through natural cooling to avoid cracking of the material due to rapid cooling. The initial temperature before cooling and the final temperature after cooling stabilization are continuously recorded to calculate the cooling range of the protective layer. Based on the cooling range and the coefficient of thermal expansion of the protective layer, the first deformation of the protective layer after cooling contraction is calculated. The first deformation is obtained by the following formula:

[0060] ΔL=α·L0·ΔT(1);

[0061] Wherein, ΔL is the first deformation, α is the coefficient of thermal expansion, L0 is the initial outer diameter of the refractory material, and ΔT is the temperature drop. The accurately calculated first deformation is the basis for subsequent grouting space design, directly affecting the amount of grouting material used and the filling effect. This application uses scientific quantitative methods to achieve the required accuracy in calculating the shrinkage of refractory materials for engineering applications, providing reliable data support for blast furnace hearth repair.

[0062] In some examples, obtaining the second deformation amount after the furnace shell expands includes:

[0063] Once the protective layer has cooled and shrunk, the stress in the blast furnace shell is determined based on the target air pressure, the inner diameter of the blast furnace shell, the thickness of the blast furnace shell, the weld coefficient, and the thin-shell theoretical model.

[0064] The strain of the blast furnace is obtained based on the ratio of the furnace shell stress to the elastic modulus of the furnace shell.

[0065] The second deformation of the furnace shell is obtained based on the product of the strain and the inner diameter of the furnace shell.

[0066] For example, based on the target wind pressure, the inner diameter of the blast furnace shell, the thickness of the blast furnace shell, the weld coefficient, and the thin-shell theoretical model, the stress of the blast furnace shell is determined. The stress is divided by the elastic modulus of the blast furnace shell to obtain the strain. The strain is multiplied by the inner diameter of the shell to obtain the second deformation of the shell. Specifically, for a blast furnace with an inner diameter of 13560 mm, a thickness of 65 mm, a wind pressure of 0.45 MPa, and a weld coefficient of 0.85, the calculated stress σ = 0.45 × 13560 / (2 × 65 × 0.85) = 54.6 MPa, and the strain = 54.6 MPa / 206 GPa = 2.65 × 10⁻⁶ GPa. -4 The second deformation amount = 2.65 × 10 -4 ×13560mm=3.26mm. The furnace shell deformation is accurately calculated using materials mechanics theory, avoiding errors caused by estimations based solely on experience, and ensuring that the accuracy of the expansion calculation meets engineering application requirements.

[0067] In some examples, after the protective layer has cooled and shrunk, the blast furnace shell stress is determined based on the target wind pressure, the inner diameter of the blast furnace shell, the thickness of the blast furnace shell, the weld coefficient, and the thin-shell theoretical model. This is obtained using the following formula:

[0068]

[0069] Where σ is the furnace shell stress, P is the target air pressure, and D i δ is the inner diameter of the furnace shell. n The thickness of the furnace shell is φ, and the weld coefficient is φ.

[0070] For example, by substituting the target air pressure, the inner diameter of the blast furnace shell, the thickness of the blast furnace shell, and the weld coefficient into equation (2), the stress of the blast furnace shell is obtained. Specifically: σ = 0.45MPa × 13560mm / (2 × 65mm × 0.85) = 54.6MPa. This stress of the blast furnace shell is used for subsequent calculations of strain and deformation. A standardized calculation method is provided to ensure the consistency of the calculation of the shell stress under different operating conditions, and to provide a theoretical basis for engineering applications.

[0071] In some examples, determining the size of the grouting space based on the first deformation and the second deformation includes:

[0072] The first deformation amount is used to compensate for the second deformation amount to determine the size of the slurry filling space between the protective layer and the furnace shell.

[0073] For example, the first deformation amount is added to the second deformation amount to obtain the grouting space between the protective layer and the furnace shell. It is clarified that the grouting space is the superimposed space obtained by compensating the second deformation amount (furnace shell expansion) with the first deformation amount (refractory material shrinkage). A direct correspondence between the deformation amount and the actual grouting space is established, ensuring clear spatial calculation logic and reliable results.

[0074] In some examples, the target wind pressure is greater than or equal to 0.45 MPa.

[0075] For example, the target air pressure during the air supply operation must be greater than or equal to 0.45 MPa. This application uses an air pressure of 0.45 MPa to ensure an effective expansion of 3.26 mm in the furnace shell, which, together with the shrinkage of the refractory material, forms sufficient grouting space. By setting a lower limit for the air pressure, the expansion of the furnace shell is ensured not to fall below the critical value, ensuring that the grouting space meets the shrinkage compensation requirements of the grouting material.

[0076] The present invention will be described in detail below with reference to the embodiments, but these should not be construed as limiting the scope of protection of the present invention.

[0077] Example:

[0078] A blast furnace has a refractory material outer diameter of 13000mm, a furnace shell inner diameter of 13560mm, a furnace shell thickness of 65mm, and a blower pressure of 0.45MPa. A grouting gap thickness of 15mm is required. During blast furnace shutdown, the refractory material in the hearth cools and shrinks (100℃ temperature drop), resulting in a calculated diameter shrinkage of 4.55mm. Then, blast furnace production resumes with high air pressure and low air volume. High air pressure increases the elastic deformation and expansion of the furnace shell. Using thin-shell theory and Hooke's law, the furnace shell diameter expansion is calculated to be 3.26mm. The combined shrinkage of the refractory material and the expansion of the furnace shell increase the grouting space by 7.81mm, which can accommodate the 34.24% volume shrinkage during the volatilization and consolidation of the grout. This ensures a dense filling, achieving the goals of sealing gas passages, repairing eroded areas, and maintaining the heat transfer system.

[0079] like Figure 2 As shown, this application proposes a blast furnace hearth grouting system, which includes: a first control module 21, a second control module 22, and a grouting execution module 23;

[0080] The first control module 21 is configured to: when a protective layer is provided inside the furnace shell of the blast furnace hearth, control the blast furnace to perform a shutdown operation so that the protective layer cools down and shrinks until the temperature of the protective layer drops below a preset temperature threshold and is in a contracted state, wherein the protective layer is formed based on refractory material;

[0081] The second control module 22 is configured to: control the blast furnace hearth to produce air according to the target air pressure and the target air volume, so that the furnace shell expands under the action of the target air pressure, and the protective layer maintains the contracted state under the action of the target air volume, forming a slurry filling space between the furnace shell and the protective layer;

[0082] The grouting execution module 23 is configured to grout the grouting space.

[0083] The effects of applying the aforementioned method in the above system can be found in the description of the aforementioned method embodiments, and will not be repeated here.

[0084] like Figure 3 As shown, this application embodiment also provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor. When the processor 320 executes the computer program 311, it implements the steps of any of the above-described methods for blast furnace hearth grouting.

[0085] Since the electronic device described in this embodiment is the device used to implement a blast furnace hearth grouting device in the embodiments of this application, those skilled in the art can understand the specific implementation method and various variations of the electronic device in this embodiment based on the method described in the embodiments of this application. Therefore, how the electronic device implements the method in the embodiments of this application will not be described in detail here. Any device used by those skilled in the art to implement the method in the embodiments of this application is within the scope of protection of this application.

[0086] In practical implementation, when the computer program 311 is executed by the processor, it can achieve the following: Figure 1 Any of the corresponding implementation methods in the embodiments.

[0087] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0088] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-readable program code.

[0089] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0090] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0091] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0092] This application also provides a computer program product, which includes computer software instructions that, when executed on a processing device, cause the processing device to execute the LDPC decoding method of a solid-state drive controller.

[0093] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0094] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0095] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0096] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0097] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0098] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0099] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0100] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0101] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A method for grouting a blast furnace hearth, characterized in that, The method includes: When a protective layer is provided inside the hearth of a blast furnace, the blast furnace is controlled to perform a shutdown operation to cool down and shrink the protective layer until the temperature of the protective layer drops below a preset temperature threshold and it is in a contracted state. The protective layer is formed based on refractory material. The blast furnace hearth is controlled to supply air according to the target air pressure and the target air volume, so that the furnace shell expands under the action of the target air pressure and the protective layer maintains the contracted state under the action of the target air volume, forming a slurry filling space between the furnace shell and the protective layer; Grouting is performed into the grouting space.

2. The blast furnace hearth grouting method according to claim 1, characterized in that, Before grouting the filling space, the method further includes: The first deformation of the protective layer after cooling and shrinkage and the second deformation of the furnace shell after expansion are obtained. Based on the first deformation amount and the second deformation amount, the size of the grouting space is determined, and the corresponding target grout volume is matched according to the size of the grouting space; The grouting of the filling space includes: Grouting is performed into the grouting space according to the target grout volume.

3. The blast furnace hearth grouting method according to claim 2, characterized in that, The step of obtaining the first deformation of the protective layer after cooling and shrinkage includes: Obtain the temperature drop of the protective layer; Based on the cooling rate and the coefficient of thermal expansion, the first deformation of the protective layer after cooling and shrinkage is calculated.

4. The blast furnace hearth grouting method according to claim 2, characterized in that, The step of obtaining the second deformation amount after the furnace shell expands includes: Once the protective layer has cooled and shrunk, the stress in the blast furnace shell is determined based on the target air pressure, the inner diameter of the blast furnace shell, the thickness of the blast furnace shell, the weld coefficient, and the thin-shell theoretical model. The strain of the blast furnace is obtained based on the ratio of the furnace shell stress to the elastic modulus of the furnace shell. The second deformation of the furnace shell is obtained based on the product of the strain and the inner diameter of the furnace shell.

5. The blast furnace hearth grouting method according to claim 4, characterized in that, Once the protective layer has cooled and shrunk, the blast furnace shell stress is determined based on the target air pressure, the blast furnace shell inner diameter, the blast furnace shell thickness, the weld coefficient, and the thin-shell theoretical model. This stress is obtained using the following formula: Where σ is the furnace shell stress, P is the target air pressure, and D i δ is the inner diameter of the furnace shell. n The thickness of the furnace shell is φ, and the weld coefficient is φ.

6. The blast furnace hearth grouting method according to claim 2, characterized in that, Determining the size of the grouting space based on the first deformation and the second deformation includes: The first deformation amount is used to compensate for the second deformation amount to determine the size of the slurry filling space between the protective layer and the furnace shell.

7. The blast furnace hearth grouting method according to claim 1, characterized in that, The target wind pressure is greater than or equal to 0.45 MPa.

8. A blast furnace hearth grouting system, characterized in that, The system includes: a first control module, a second control module, and a grouting execution module; The first control module is configured to: when a protective layer is provided inside the furnace shell of the blast furnace hearth, control the blast furnace to perform a shutdown operation to cool and shrink the protective layer until the temperature of the protective layer drops below a preset temperature threshold and it is in a contracted state. The protective layer is formed based on refractory material. The second control module is configured to: control the blast furnace hearth to produce air according to the target air pressure and the target air volume, so that the furnace shell expands under the action of the target air pressure, and the protective layer maintains the contracted state under the action of the target air volume, forming a slurry filling space between the furnace shell and the protective layer; The grouting execution module is configured to grout the grouting space.

9. An electronic device, comprising: The memory and processor are characterized in that the processor is used to execute a computer program stored in the memory to implement the steps of a blast furnace hearth grouting method as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of a blast furnace hearth grouting method as described in any one of claims 1-7.

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