A method for determining the injection location in a blast furnace, terminal equipment, and storage medium.

Abstract

The present application relates to a blast furnace injection position determination method, terminal equipment and storage medium, the method comprises: adjusting coke ratio or coal ratio based on total furnace material balance and heat balance; adjusting blast furnace injection amount or oxygen enrichment rate based on direct reduction degree and shaft efficiency; increasing injection position based on solid charge zone heat balance; adjusting blast furnace injection amount or oxygen enrichment rate based on combustion temperature and error of blast dynamic energy and initial value; inputting all adjusted injection positions and corresponding injection amounts. The present application overcomes the fluctuation of blast furnace conditions caused by new process through multi-objective optimization, and ensures the smooth operation of blast furnace and shaft efficiency.

Description

Technical Field

[0001] This invention relates to the field of blast furnace smelting, and in particular to a method for determining the injection position in a blast furnace, a terminal device, and a storage medium. Background Technology

[0002] The rapid development of the steel industry has brought a series of challenges to the environment, resources, and energy. In particular, regarding greenhouse gas emissions, CO2 and related gases accounted for more than 15% of total emissions in 2021. Therefore, reducing CO2 emissions from steel companies is of great significance for their future survival and development.

[0003] Although blast furnace technology accounts for 70-90% of total steel emissions, its mature technology, large production capacity, and high efficiency mean that blast furnaces will remain the mainstream ironmaking equipment supporting the huge demand for steel materials for a considerable period of time. Therefore, low-carbon blast furnace technology is a path that the steel industry needs to explore. Currently, the more mainstream low-carbon blast furnace technologies include top gas recirculation and hydrogen-rich gas injection. The main technical approach involves injecting highly reducing gases into the blast furnace body or hearth to increase the reducing atmosphere inside the furnace, promote indirect reduction, reduce the proportion of direct reduction, and thus reduce the consumption of coke or fixed carbon in blast furnace smelting, achieving low-carbon smelting. However, the temperature, composition, and location of the injected gas cause fluctuations in the blast furnace conditions, leading to increased blast furnace consumption, which contradicts the original intention of energy conservation and emission reduction. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a method for determining the injection location in a blast furnace, a terminal device, and a storage medium.

[0005] The specific plan is as follows:

[0006] A method for determining the injection location in a blast furnace includes the following steps:

[0007] S1: Set the initial smelting process parameters of the blast furnace, and record the theoretical combustion temperature, theoretical blast kinetic energy and furnace efficiency of the blast furnace before the injection of reducing gas.

[0008] S2: Determine the initial direct reduction degree, the composition and temperature of the injected reducing gas, as well as the initial injection volume and initial injection location;

[0009] S3: Based on the injection volume and injection position, water is injected to reduce gas;

[0010] S4: Based on the material balance of the entire blast furnace, calculate the smelting process parameters of the blast furnace to ensure that the error of the material balance is within the set material error range;

[0011] S5: Based on the blast furnace smelting process parameters calculated in step S4, calculate the first type of overall blast furnace heat balance. By adjusting the coke ratio or coal ratio, ensure that the heat error obtained by the first type of overall blast furnace heat balance calculation is within the set heat error range, and record the smelting process parameters at this time.

[0012] S6: Based on the Lister curve and combined with the theoretical furnace efficiency, the direct reduction degree is calculated. By adjusting the furnace hearth injection rate or oxygen enrichment rate, the error between the calculated direct reduction degree and the initial direct reduction degree is kept within the set direct reduction degree error range while ensuring the furnace efficiency.

[0013] S7: Based on the smelting process parameters recorded in step S5, calculate the heat balance of the solid charge zone and determine whether the heat balance of the solid charge zone reaches the allowable error of heat balance. If it does, record the smelting process parameters at this time and proceed to S8; otherwise, add a blowing position at the blast furnace body and set the corresponding initial blowing amount, and return to S3.

[0014] S8: Based on the smelting process parameters recorded in step S7, calculate the corresponding combustion temperature and blast kinetic energy, and determine whether the difference between the calculated combustion temperature and blast kinetic energy and the theoretical combustion temperature and theoretical blast kinetic energy both meet the parameter error range. If so, output all injection positions and corresponding injection amounts; otherwise, after readjusting the furnace hearth injection amount or oxygen enrichment rate, return to S3.

[0015] Furthermore, the initial smelting process parameters of the blast furnace include the composition of pig iron, slag, dust, raw materials and fuels, blast parameters, and the quantity and composition of blast furnace output materials.

[0016] Furthermore, the initial injection position of the reducing gas is set at the furnace hearth tuyeres.

[0017] Furthermore, 900-1000℃ is used as the boundary between the solid furnace charge zone and the high-temperature zone.

[0018] Furthermore, the heat error range is less than 5 × 10⁻⁶. -4 The direct reproduction error range is less than 10. -3 The parameter error range is less than 2%.

[0019] A blast furnace injection position determination terminal device includes a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the method described above in the embodiments of the present invention.

[0020] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method described above in the embodiments of the present invention.

[0021] The present invention adopts the above technical solution and provides a technical solution that can determine the optimal combination of positions of the reducing medium injected into the blast furnace and the appropriate injection amount at each position. Taking into account the overall energy and quality balance of the blast furnace, regional heat balance, blast depth, theoretical combustion temperature and furnace efficiency, the invention optimizes multiple objectives to overcome the fluctuations in blast furnace conditions caused by the new process and ensure the smooth operation of the blast furnace and the efficiency of the furnace body. Attached Figure Description

[0022] Figure 1 The diagram shown is a flowchart of Embodiment 1 of the present invention. Detailed Implementation

[0023] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention.

[0024] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0025] Example 1:

[0026] This invention provides a method for determining the injection position in a blast furnace, such as... Figure 1 As shown, the method includes the following steps:

[0027] S1: Set the initial smelting process parameters of the blast furnace, and record the theoretical combustion temperature, theoretical blast kinetic energy and theoretical furnace efficiency of the blast furnace before the injection of reducing gas.

[0028] The initial blast furnace smelting process parameters are the daily smelting process parameters before the injection of reducing gas into the blast furnace. They are calculated using material balance and heat balance combined with daily production data. In this embodiment, the initial blast furnace smelting process parameters include pig iron composition, slag composition, composition and content of furnace dust, raw material and fuel composition, blast parameters, and the quantity and composition of blast furnace output materials.

[0029] Theoretical combustion temperature, theoretical blast kinetic energy, and theoretical furnace efficiency are used as targets for later optimization.

[0030] S2: Determine the initial direct reduction degree, the composition and temperature of the injected reducing gas, as well as the initial injection volume and the set injection position.

[0031] In this embodiment, the initial injection position of the reducing gas is set at the furnace tuyeres.

[0032] S3: Based on the injection volume and injection position, water is injected to reduce the gas.

[0033] Initially, since the injection point is at the furnace tuyeres, the injection of reducing gas with the composition and temperature determined in step S2 is performed only at the furnace tuyeres. Then, injection points are added sequentially along the furnace body.

[0034] S4: Based on the material balance of the entire blast furnace, calculate the smelting process parameters of the blast furnace to ensure that the error of the material balance is within the set material error range.

[0035] S5: Based on the blast furnace smelting process parameters calculated in step S4, calculate the first type of overall blast furnace heat balance. By adjusting the coke ratio or coal ratio, ensure that the heat error obtained from the first type of overall blast furnace heat balance calculation is within the set heat error range, and record the smelting process parameters at this time.

[0036] In this embodiment, the heat error range is set to be less than 5 × 10⁻⁶. -4 .

[0037] S6: Based on the Lister curve and combined with the theoretical furnace efficiency, the direct reduction degree is calculated. By adjusting the furnace hearth injection rate or oxygen enrichment rate, the error between the calculated direct reduction degree and the initial direct reduction degree is kept within the set direct reduction degree error range while ensuring the furnace efficiency.

[0038] In this embodiment, the direct reproduction error range is set to be less than 10. -3 .

[0039] S7: Based on the smelting process parameters recorded in step S5, calculate the heat balance of the solid charge zone and determine whether the heat balance of the solid charge zone has reached the allowable error of heat balance. If it has, record the smelting process parameters at this time and proceed to S8; otherwise, add a blowing position at the blast furnace body and set the corresponding initial blowing amount, and return to S3.

[0040] In this embodiment, 900-1000℃ is used as the boundary between the solid charge zone and the high-temperature zone.

[0041] S8: Based on the smelting process parameters recorded in step S7, calculate the corresponding combustion temperature and blast kinetic energy, and determine whether the difference between the calculated combustion temperature and blast kinetic energy and the theoretical combustion temperature and theoretical blast kinetic energy both meet the parameter error range. If so, output all injection positions and corresponding injection amounts; otherwise, after readjusting the furnace hearth injection amount or oxygen enrichment rate, return to S3.

[0042] In this embodiment, the parameter error range is set to be less than 2%.

[0043] Through the above steps, this embodiment can obtain the location and corresponding amount of reducing gas required for injection into the blast furnace, as well as a series of blast furnace smelting process parameters under these conditions, such as coke ratio, coal ratio, air consumption per ton of iron, oxygen enrichment rate, theoretical combustion temperature, gas production per ton of iron, and gas utilization rate. Thus, it is possible to obtain the changes in the technical and economic indicators of the blast furnace under different reducing gas injection conditions.

[0044] Example 2:

[0045] The present invention also provides a blast furnace injection position determination terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the above-described method embodiment of Embodiment 1 of the present invention.

[0046] Furthermore, as an executable solution, the blast furnace injection position determination terminal device can be a computing device such as a desktop computer, laptop, handheld computer, or cloud server. The blast furnace injection position determination terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will understand that the above-described composition of the blast furnace injection position determination terminal device is merely an example and does not constitute a limitation on the blast furnace injection position determination terminal device. It may include more or fewer components than described above, or combine certain components, or different components. For example, the blast furnace injection position determination terminal device may also include input / output devices, network access devices, buses, etc., and this embodiment of the invention does not limit this.

[0047] Furthermore, as an executable solution, the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor. This processor is the control center of the blast furnace injection position determination terminal equipment, connecting all parts of the blast furnace injection position determination terminal equipment via various interfaces and lines.

[0048] The memory can be used to store the computer programs and / or modules. The processor, by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory, realizes various functions of the blast furnace injection position determination terminal device. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory and may also include non-volatile memory, such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0049] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the method described in the embodiments of the present invention.

[0050] If the module / unit integrated into the blast furnace injection position determination terminal equipment 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, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), and a software distribution medium, etc.

[0051] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A method for determining the injection position in a blast furnace, characterized in that, Includes the following steps: S1: Set the initial smelting process parameters of the blast furnace, and record the theoretical combustion temperature, theoretical blast kinetic energy and furnace efficiency of the blast furnace before the injection of reducing gas. S2: Determine the initial direct reduction degree, the composition and temperature of the injected reducing gas, as well as the initial injection volume and initial injection location; S3: Based on the injection volume and injection position, water is injected to reduce gas; S4: Based on the material balance of the entire blast furnace, calculate the smelting process parameters of the blast furnace to ensure that the error of the material balance is within the set material error range; S5: Based on the blast furnace smelting process parameters calculated in step S4, calculate the first type of overall blast furnace heat balance. By adjusting the coke ratio or coal ratio, ensure that the heat error obtained by the first type of overall blast furnace heat balance calculation is within the set heat error range, and record the smelting process parameters at this time. S6: Based on the Lister curve and combined with the theoretical furnace efficiency, the direct reduction degree is calculated. By adjusting the furnace hearth injection rate or oxygen enrichment rate, the error between the calculated direct reduction degree and the initial direct reduction degree is kept within the set direct reduction degree error range while ensuring the furnace efficiency. S7: Based on the smelting process parameters recorded in step S5, calculate the heat balance of the solid charge zone and determine whether the heat balance of the solid charge zone reaches the allowable error of heat balance. If it does, record the smelting process parameters at this time and proceed to S8. Otherwise, add a blower position at the blast furnace body, set the corresponding initial blower volume, and return to S3; S8: Based on the smelting process parameters recorded in step S7, calculate the corresponding combustion temperature and blast kinetic energy, and determine whether the difference between the calculated combustion temperature and blast kinetic energy and the theoretical combustion temperature and theoretical blast kinetic energy both meet the parameter error range. If so, output all injection positions and corresponding injection amounts; otherwise, after readjusting the furnace hearth injection amount or oxygen enrichment rate, return to S3.

2. The method for determining the injection position in a blast furnace according to claim 1, characterized in that: The initial smelting process parameters of a blast furnace include the composition of pig iron, slag, dust, raw materials and fuels, blast parameters, and the quantity and composition of blast furnace output materials.

3. The method for determining the injection position in a blast furnace according to claim 1, characterized in that: The initial injection point for the reducing gas is set at the furnace hearth tuyeres.

4. The method for determining the injection position in a blast furnace according to claim 1, characterized in that: 900-1000℃ is used as the boundary between the solid furnace charge zone and the high temperature zone.

5. The method for determining the injection position in a blast furnace according to claim 1, characterized in that: The heat error range is less than 5×10 -4 The direct reproduction error range is less than 10. -3 The parameter error range is less than 2%.

6. A terminal device for determining the injection position in a blast furnace, characterized in that: It includes a processor, a memory, and a computer program stored in the memory and running on the processor, wherein the processor executes the computer program to implement the steps of the method as described in any one of claims 1 to 5.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 5.

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