WO2024060290A1 - Blast furnace injection position determination method and terminal device, and storage medium - Google Patents

Abstract

The present invention relates to a blast furnace injection position determination method and terminal device, and a storage medium. The method comprises: adjusting a coke ratio or a coal ratio on the basis of whole-furnace material balance and heat balance; adjusting the injection volume or the oxygen enrichment rate of a hearth on the basis of a degree of direct reduction and stack efficiency; adding injection positions on the basis of the heat balance of a solid furnace charge zone; adjusting the injection volume or the oxygen enrichment rate of the hearth on the basis of the errors between a combustion temperature and blast kinetic energy and initial values; and inputting all the injection positions after adjustment and corresponding injection volumes. According to the present invention, by means of multi-objective optimization, fluctuation of the blast furnace condition caused by a new process is overcome, and the smooth operation and the stack efficiency of a blast furnace are ensured.

Description

A blast furnace injection position determination method, terminal equipment and storage medium Technical field

The invention relates to the field of blast furnace smelting, and in particular to a blast furnace injection position determination method, terminal equipment and storage medium.

Background technique

The rapid development of the steel industry has brought a series of challenges to the environment, resources and energy. Especially in terms of greenhouse gas emissions, emissions of CO ₂ and other related gases will account for more than 15% of total emissions in 2021. Therefore, reducing CO ₂ emissions from steel companies is very important for the future survival and development of steel companies. significance.

Although the blast furnace process accounts for 70-90% of the entire steel emissions, due to its advantages of mature process technology, large production capacity, and high efficiency, the blast furnace will still be the mainstream supporting the huge demand for steel materials for a considerable period of time in the future. Ironmaking equipment. Therefore, low-carbon blast furnace technology is a path that the steel industry needs to explore. At present, the more mainstream low-carbon blast furnace technologies include top gas circulation technology and hydrogen-rich gas injection. The main technical route is to inject highly reducing gas into the blast furnace shaft or hearth to improve the reducing atmosphere inside the blast furnace. , promote the development of indirect reduction, reduce the proportion of direct reduction, thereby reducing the consumption of coke or fixed carbon in blast furnace smelting, and realizing low-carbon smelting in blast furnaces. However, the temperature, composition and position of the injection gas cause fluctuations in the blast furnace conditions, thereby increasing the consumption of the blast furnace, which goes against the original intention of saving energy and reducing consumption.

Contents of the invention

In order to solve the above problems, the present invention proposes a blast furnace injection position determination method, terminal equipment and storage medium.

The specific plans are as follows:

A method for determining the injection position of a blast furnace, including 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 reduction gas is injected;

S2: Determine the initial degree of direct reduction, the composition and temperature of the injection reduction gas, as well as the initial injection volume and initial injection position;

S3: Injection of water-injection reduction gas based on injection volume and injection position;

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 smelting process parameters of the blast furnace calculated in step S4, calculate the first full furnace heat balance of the blast furnace, and adjust the coke ratio or coal ratio so that the heat error calculated through the first full furnace heat balance is within the set heat error Within the range, record the smelting process parameters at this time;

S6: Calculate the direct reduction degree based on the Riester curve and combined with the theoretical furnace efficiency. By adjusting the furnace injection volume or oxygen enrichment rate, the calculated direct reduction degree and the initial direct reduction degree are equal to each other while ensuring the furnace efficiency. The error is within the set direct reduction error range;

S7: Based on the smelting process parameters recorded in step S5, calculate the heat balance of the solid charge area, and determine whether the heat balance of the solid charge area reaches the heat balance allowable error. If it does, record the smelting process parameters at this time and enter S8; otherwise, in the blast furnace Increase the injection position and set the corresponding initial injection amount, then 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 differences between the calculated combustion temperature and blast kinetic energy and the theoretical combustion temperature and theoretical blast kinetic energy meet the parameter error range. If Yes, output all injection positions and corresponding injection volumes; otherwise, return to S3 after readjusting the furnace injection volume or oxygen enrichment rate.

Further, the initial smelting process parameters of the blast furnace include pig iron composition, slag composition, furnace dust composition and content, raw fuel composition, blast parameters, and the amount and composition of blast furnace output materials.

Further, the initial injection position of the reducing gas is set to the tuyere of the furnace hearth.

Furthermore, 900-1000°C is used as the dividing line between the solid charge area and the high temperature area.

Further, the caloric error range is less than 5×10 ^-4 , the direct reduction degree error range is less than 10 ^-3 , and the parameter error range is less than 2%.

A blast furnace injection position determination terminal device, including a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the embodiment of the present invention is implemented. The steps of the above method.

A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the method described above in the embodiment of the present invention are implemented.

The present invention adopts the above technical scheme and provides a technical scheme that can determine the optimal position combination of the reducing medium injection in the blast furnace and the appropriate injection amount at each position. It comprehensively considers the energy and quality balance of the entire blast furnace, the regional heat balance, the blast depth, the theoretical combustion temperature and the furnace body efficiency. Through multi-objective optimization, it overcomes the fluctuations in the blast furnace condition caused by the new process and ensures the smooth operation of the blast furnace and the furnace body efficiency.

Description of drawings

FIG. 1 is a flow chart showing a first embodiment of the present invention.

Detailed ways

To further explain various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, and are mainly used to illustrate the embodiments, and can be used to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these contents, those of ordinary skill in the art will be able to understand other possible implementations and advantages of the present invention.

The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

Example 1:

An embodiment of the present invention provides a method for determining a blast furnace injection position, as shown in FIG1 , the method comprising 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 theoretical furnace efficiency of the blast furnace before the reduction gas is injected.

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

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

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

In this embodiment, the initial injection position for injecting the reducing gas is set to the tuyere of the furnace hearth.

S3: Injection of water-injection reducing gas based on injection amount and injection position.

Initially, since the injection position is the tuyere of the furnace hearth, the injection is only carried out at the tuyere of the furnace hearth with the composition and temperature of the injection reduction gas determined in step S2, and then the injection positions are sequentially added to the furnace body.

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

S5: Based on the smelting process parameters of the blast furnace calculated in step S4, calculate the first full furnace heat balance of the blast furnace, and adjust the coke ratio or coal ratio so that the heat error calculated through the first full furnace heat balance is within the set heat error Within the range, record the smelting process parameters at this time.

In this embodiment, the heat error range is set to less than 5×10 ^-4 .

S6: Calculate the direct reduction degree based on the Riester curve and combined with the theoretical furnace efficiency. By adjusting the furnace injection volume or oxygen enrichment rate, the calculated direct reduction degree and the initial direct reduction degree are equal to each other while ensuring the furnace efficiency. The error is within the set direct reduction error range.

In this embodiment, the direct reduction degree error range is set to less than 10 ^-3 .

S7: Based on the smelting process parameters recorded in step S5, calculate the heat balance of the solid charge area, and determine whether the heat balance of the solid charge area reaches the heat balance allowable error. If it does, record the smelting process parameters at this time and enter S8; otherwise, in the blast furnace Go to the increased injection position, set the corresponding initial injection amount, and return to S3.

In this embodiment, 900-1000°C is used as the dividing line between the solid charge zone and the high temperature zone.

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

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

Through the above steps, this embodiment can obtain the position and corresponding amount of reducing gas that needs to be injected into the blast furnace, as well as the coke ratio, coal ratio, air consumption per ton of iron, oxygen enrichment rate, theoretical combustion temperature, and per ton of iron of the blast furnace. A series of blast furnace smelting process parameters such as gas production volume and gas utilization rate. In this way, the changes in the technical and economic indicators of the blast furnace can be obtained under different reducing gas injection conditions.

Example 2:

The invention also provides a blast furnace injection position determination terminal device, which includes a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, The steps in the above method embodiment of Embodiment 1 of the present invention.

Further, as an executable solution, the blast furnace injection position determination terminal device may be a computing device such as a desktop computer, notebook, PDA, cloud server, etc. 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 can understand that the above-mentioned composition structure of the blast furnace injection position determination terminal equipment is only an example of the blast furnace injection position determination terminal equipment, and does not constitute a limitation of the blast furnace injection position determination terminal equipment, and may include more than the above. or fewer components, or a combination of certain components, or different components. For example, the blast furnace injection position determination terminal device may also include input and output devices, network access devices, buses, etc. This is not the case in the embodiment of the present invention. limited.

Further, as an executable solution, the so-called processor can be a central processing unit (Central Processing Unit, CPU), or other general-purpose processor, digital signal processor (Digital Signal Processor, DSP), application-specific integrated circuit ( Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general processor can be a microprocessor or the processor can be any conventional processor. The processor is the control center of the blast furnace injection position determination terminal equipment and uses various interfaces and lines to connect the entire blast furnace injection position. Blow positions determine various parts of the terminal equipment.

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

The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above method in the embodiment of the present invention are implemented.

If the integrated module/unit of the blast furnace injection position determination terminal equipment is implemented in the form of 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 present invention can implement all or part of the processes in the methods of the above embodiments, and can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can be stored in a computer-readable storage medium. When the program is executed by the processor, the steps of each of the above method embodiments can be implemented. Wherein, the computer program includes computer program code, which may be in the form of source code, object code, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording media, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory) , random access memory (RAM, Random Access Memory) and software distribution media, etc.

Although the invention has been specifically shown and described in conjunction with preferred embodiments, it will be apparent to those skilled in the art that the invention can be modified in form and detail without departing from the spirit and scope of the invention as defined by the appended claims. Various changes are made within the scope of the present invention.

Claims (7)

A method for determining the injection position of a blast furnace, which is characterized by including 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 injecting the reducing gas; S2: determining the initial direct reduction degree, the composition and temperature of the injected reducing gas, as well as the initial injection amount and the initial injection position; S3: Injection of water-injection reduction gas based on injection volume and injection position; S4: Based on the material balance of the entire blast furnace, calculate the smelting process parameters of the blast furnace to ensure that the material balance error is within the set material error range; S5: Based on the smelting process parameters of the blast furnace calculated in step S4, calculate the first full furnace heat balance of the blast furnace, and adjust the coke ratio or coal ratio so that the heat error calculated through the first full furnace heat balance is within the set heat error Within the range, record the smelting process parameters at this time; S6: Calculate the direct reduction degree based on the Riester curve and combined with the theoretical furnace efficiency. By adjusting the furnace injection volume or oxygen enrichment rate, the calculated direct reduction degree and the initial direct reduction degree are equal to each other while ensuring the furnace efficiency. The error is within the set direct reduction error range; S7: Based on the smelting process parameters recorded in step S5, calculate the heat balance of the solid charge area, and determine whether the heat balance of the solid charge area reaches the heat balance allowable error. If it does, record the smelting process parameters at this time and enter S8; otherwise, in the blast furnace Increase the injection position and set the corresponding initial injection amount, then 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 differences between the calculated combustion temperature and blast kinetic energy and the theoretical combustion temperature and theoretical blast kinetic energy meet the parameter error range. If If yes, output all injection positions and corresponding injection amounts; otherwise, after readjusting the furnace injection amount or oxygen enrichment rate, return to S3. The blast furnace injection position determination method according to claim 1, characterized in that: the blast furnace initial smelting process parameters include pig iron composition, slag composition, furnace dust composition and content, raw fuel composition, blast parameters, blast furnace output material Amounts and ingredients. The blast furnace injection position determination method according to claim 1, characterized in that: the initial injection position for injecting the reducing gas is set at the tuyere of the furnace hearth. The blast furnace injection position determination method according to claim 1, characterized in that: 900-1000°C is used as the dividing line between the solid charge area and the high temperature area. The blast furnace injection position determination method according to claim 1, characterized in that: the heat error range is less than 5×10 ^-4 , the direct reduction degree error range is less than 10 ^-3 , and the parameter error range is less than 2%. A blast furnace injection position determination terminal device, characterized by: including a processor, a memory, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the following is implemented: The steps of the method according to any one of claims 1 to 5. A computer-readable storage medium stores a computer program, which is characterized in that when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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