Low-carbon iron-making method for heating blast furnace by electromagnetic induction by utilizing conductivity of coke

Abstract

The invention provides an electromagnetic induction heating blast furnace low-carbon ironmaking method by utilizing the conductivity of coke, and belongs to the field of blast furnace ironmaking. According to the method, the coke in the blast furnace is directly heated by optimizing the conductivity of the coke and combining an electromagnetic induction heating system. In addition, graphite carbon bricks at the furnace hearth and the furnace bottom of the blast furnace also have electrical conductivity and can be subjected to electromagnetic induction heating, so that energy is provided for the blast furnace, and dependence on fossil fuel is reduced. Meanwhile, the method also considers the pretreatment of furnace charge, the cyclic utilization of furnace top gas, the integration of an intelligent control system and the use of a low-carbon reducing agent, so that the comprehensive optimization of the ironmaking process and the remarkable reduction of carbon emission are realized. Through the innovative method, a new solution is expected to be provided for green transformation of the iron and steel industry, and low carbon and low consumption in the ironmaking process are achieved.

Description

Technical Field

[0001] The invention relates to the field of low-carbon metallurgical ironmaking, and in particular to an electromagnetic induction heating process utilizing the electrical conductivity of coke. This method can be used to complete novel low-carbon direct reduction ironmaking. Background Art

[0002] Globally, the steel industry is one of the main sources of energy consumption and greenhouse gas emissions. According to statistics, carbon dioxide produced during steel production accounts for about 7% of the world's total emissions, of which the blast furnace ironmaking process is particularly critical. The traditional blast furnace ironmaking process relies on coke as a reducing agent and fuel. This process not only consumes a large amount of fossil energy, but also is accompanied by a large amount of carbon dioxide emissions. With the increasing global concern about climate change, reducing carbon emissions in the steel production process has become an urgent issue that needs to be addressed.

[0003] In order to reduce carbon emissions in the ironmaking process, the industry has taken a variety of measures, including improving energy efficiency, using electric furnaces instead of blast furnaces, and developing direct iron reduction technology. However, these methods often face problems such as high cost, high technical difficulty, or limited production capacity. Therefore, developing an ironmaking technology that can effectively reduce carbon emissions while maintaining economy and production capacity is crucial to the sustainable development of the steel industry.

[0004] In recent years, with the development of renewable energy technology and the reduction of costs, it has become possible to use green electricity (such as wind power, solar energy, etc.) to provide energy for industrial production. Electromagnetic induction heating technology, as an efficient and clean heating method, has been applied in many fields. A Chinese patent (patent application number: CN118581286A) discloses a molten iron production system and method for reducing CO2 emissions, which uses a molten iron production system that reduces CO2 emissions by combining a hydrogen-based vertical furnace and an electromagnetic induction smelting furnace. This technology achieves heating by generating eddy currents in the conductor, and has the advantages of fast heating speed, high thermal efficiency, and good controllability. The application of electromagnetic induction heating technology to blast furnace ironmaking is expected to achieve innovation in traditional ironmaking processes. Summary of the invention

[0005] In view of the above problems, the present invention provides a method for low-carbon ironmaking in a blast furnace using electromagnetic induction heating using the electrical conductivity of coke. This method solves the problem of excessively high carbon emission content in the ironmaking process in the prior art. The technical solution adopted by the present invention mainly includes:

[0006] A method for low-carbon ironmaking in a blast furnace using electromagnetic induction heating using the electrical conductivity of coke, characterized in that it comprises the following steps:

[0007] (1) preparing coke, wherein the coke has good electrical conductivity;

[0008] (2) installing an electromagnetic induction heating system inside the blast furnace, the system comprising an electromagnetic coil and a control unit for generating a high-frequency alternating magnetic field;

[0009] (3) Electromagnetic induction coils are installed on the furnace cylinder and furnace bottom to heat the furnace cylinder and furnace bottom using the conductivity of graphite carbon bricks;

[0010] (4) using the electromagnetic induction heating system to heat the coke to provide the heat energy required for blast furnace ironmaking;

[0011] (5) Using green electricity as the energy source of the electromagnetic induction heating system, wherein the green electricity is selected from wind energy and solar energy;

[0012] (6) The intelligent control system monitors the temperature, pressure and charge distribution inside the blast furnace in real time, and automatically adjusts the output power of the electromagnetic induction heating system based on the monitoring results;

[0013] (7) Through gas recovery and energy utilization, energy consumption in ironmaking can be saved, harmful gas emissions can be reduced, and low-carbon ironmaking can be achieved.

[0014] Furthermore, the optimization of the conductivity of the coke is achieved by at least one of the following methods: (1) selecting a coke raw material with high conductivity; (2) increasing the conductivity of the coke by chemical treatment; (3) changing the structure of the coke by physical treatment to improve its conductivity.

[0015] Furthermore, the control unit of the electromagnetic induction heating system can automatically adjust the current and frequency of the electromagnetic coil according to a preset heating curve.

[0016] Furthermore, the intelligent control system includes temperature sensors, pressure sensors and charge distribution sensors, as well as a central processor for processing sensor data and making control decisions.

[0017] Furthermore, the method of the present invention also includes the following steps: (1) the coal gas generated at the furnace top is treated by a purification system and then partially recycled back into the blast furnace to improve energy efficiency and reduce carbon emissions; (2) the proportion and charging method of the charge are optimized to improve the heat conduction efficiency and reduction efficiency of the charge.

[0018] Furthermore, the design of the electromagnetic induction heating system takes into account the high temperature and high pressure environment inside the blast furnace, and has the characteristics of high temperature resistance, high pressure resistance and corrosion resistance.

[0019] Furthermore, the method also includes an energy recovery system for recovering and reusing the heat generated during the blast furnace ironmaking process.

[0020] Furthermore, the method also includes a waste gas treatment system for treating and reducing harmful gas emissions generated during the blast furnace ironmaking process.

[0021] Furthermore, the method also includes a data recording and analysis system for recording key parameters in the ironmaking process and analyzing the data to optimize the ironmaking process.

[0022] Features of the present invention include

[0023] (1) An electromagnetic induction heating system is used, which includes an electromagnetic coil and a control unit. The electromagnetic coil is installed inside the blast furnace and is used to generate a high-frequency alternating magnetic field. The control unit is responsible for adjusting the current and frequency of the electromagnetic coil to generate the required alternating magnetic field. The system can utilize the conductive properties of coke to directly heat the coke through the electromagnetic induction effect, thereby providing the blast furnace with the heat energy required for ironmaking;

[0024] (2) In order to improve the efficiency of electromagnetic induction heating, the present invention optimizes the electrical conductivity of coke. This can be achieved by selecting coke raw materials with high electrical conductivity, increasing the electrical conductivity of coke through chemical treatment, or changing the structure of coke through physical treatment.

[0025] (3) Use green electricity such as wind and solar energy to drive the electromagnetic induction heating system, reduce dependence on fossil fuels, and reduce the carbon footprint of the ironmaking process. The intelligent power management module integrated in the system can adjust the intensity of electromagnetic heating according to the real-time power supply situation to ensure efficient and sustainable energy utilization. At the same time, excess green electricity is stored through energy storage devices to cope with unstable power supply conditions, thereby achieving continuous and stable operation of the ironmaking process.

[0026] (4) A recycling scheme for top gas is proposed. The high-temperature gas generated is purified and then re-injected into the blast furnace as a reducing agent or heating agent, further reducing energy consumption and carbon emissions. This process ensures full utilization of gas through precise ratio and flow control, effectively improving the energy efficiency of the system.

[0027] (5) The energy recovery system is used to recover and utilize the waste heat generated during the blast furnace ironmaking process. The waste heat is used to preheat the feed and circulating gas, increase the reaction temperature, and reduce the energy demand for electromagnetic induction heating. This energy recovery solution can effectively reduce the overall energy consumption of the system, making the ironmaking process more energy-efficient.

[0028] (6) To further reduce environmental impact, the present invention is equipped with a waste gas treatment system to treat harmful gases generated during the ironmaking process. The system uses multi-stage filtration and catalytic decomposition technology to effectively remove pollutants such as CO2, SOx and NOx, meets environmental protection standards, and promotes the green transformation of steel production.

[0029] (7) The system also integrates a data recording and analysis module to record key data such as temperature, pressure, current, and gas composition during the ironmaking process. Through real-time analysis of these data and accumulation of historical data, support can be provided for process optimization and equipment maintenance, thereby continuously improving the efficiency and reliability of the ironmaking process.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The invention uses an electromagnetic induction heating system to directly heat the coke through its electrical conductivity, significantly reducing carbon emissions during the ironmaking process and helping to achieve a more environmentally friendly, low-carbon ironmaking process. The current and frequency of the electromagnetic heating system can be adjusted to adapt to different coke and ore characteristics, and it has strong process adaptability. This flexibility enables the system to meet the needs of different ironmaking production conditions, with wide applicability and market potential. The efficient electromagnetic induction heating system can directly generate heat in the coke, greatly reducing heat transmission losses. At the same time, the use of green electricity and the integration of energy recovery systems further improve overall energy efficiency, making the ironmaking process more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a technical flow chart of the present invention. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementations.

[0034] (1) Select coke with excellent electrical conductivity or improve the electrical conductivity of coke through chemical or physical treatment. Feed ore and coke into the blast furnace through the feeding system for smelting;

[0035] (2) Use green electricity such as wind energy and solar energy to drive the electromagnetic induction heating system, adjust the current and frequency to generate a high-frequency alternating magnetic field, use the electromagnetic induction effect, directly heat the coke through the electrical conductivity of the coke, and use the graphite carbon bricks in the furnace hearth and furnace bottom for heating, thereby providing the required heat energy for the blast furnace;

[0036] (3) Monitor temperature, pressure and other parameters in real time through sensors, and automatically adjust the power output of the electromagnetic heating system;

[0037] (4) Purify blast furnace top gas through gas recovery and recycling system, collect carbon dioxide and harmful gases through multi-stage filtration and electrolytic catalytic technology, ensure compliance with environmental protection standards, and re-inject part of the gas into the blast furnace through the injection system, thereby improving energy efficiency and reducing emissions;

[0038] (5) Record and analyze key data in the ironmaking process through the data recording and analysis system to optimize the process and support equipment maintenance;

[0039] (6) The molten iron produced in the blast furnace is transported to the next process via torpedo tank cars to complete the remaining steelmaking process.

Claims

1. A method for low-carbon ironmaking in a blast furnace using electromagnetic induction heating using the electrical conductivity of coke, characterized in that: The following steps are involved: (1) preparing coke, wherein the coke has good electrical conductivity; (2) installing an electromagnetic induction heating system inside the blast furnace, the system comprising an electromagnetic coil and a control unit for generating a high-frequency alternating magnetic field; (3) using the electromagnetic induction heating system to heat the coke to provide the heat energy required for blast furnace ironmaking; (4) Using green electricity as the energy source of the electromagnetic induction heating system, wherein the green electricity is selected from wind energy and solar energy; (5) The intelligent control system monitors the temperature, pressure and charge distribution inside the blast furnace in real time, and automatically adjusts the output power of the electromagnetic induction heating system based on the monitoring results; (6) Through gas recovery and energy utilization, energy consumption in ironmaking can be saved, harmful gas emissions can be reduced, and low-carbon ironmaking can be achieved.

2. The method according to claim 1, characterized in that The optimization of the conductivity of the coke is achieved by at least one of the following methods: (1) selecting a coke raw material with high conductivity; (2) increasing the conductivity of the coke by chemical treatment; (3) changing the structure of the coke by physical treatment to improve its conductivity.

3. The method according to claim 1, characterized in that The control unit of the electromagnetic induction heating system can automatically adjust the current and frequency of the electromagnetic coil according to a preset heating curve.

4. The method according to claim 1, characterized in that: The intelligent control system includes temperature sensors, pressure sensors and charge distribution sensors, as well as a central processor for processing sensor data and making control decisions.

5. The method according to claim 1, characterized in that The following steps are also included: (1) The coal gas generated at the top of the furnace is treated by a purification system and partially recycled back into the blast furnace to improve energy efficiency and reduce carbon emissions; (2) The proportion and loading method of the charge are optimized to improve the heat conduction efficiency and reduction efficiency of the charge.

6. The method according to claim 1, characterized in that The design of the electromagnetic induction heating system takes into account the high temperature and high pressure environment inside the blast furnace, and has the characteristics of high temperature resistance, high pressure resistance and corrosion resistance.

7. The method according to claim 1, characterized in that The method also includes an energy recovery system for recovering and reusing heat generated during the blast furnace ironmaking process.

8. The method according to claim 1, characterized in that: The method also includes a waste gas treatment system for treating and reducing harmful gas emissions generated during the blast furnace ironmaking process.

9. The method according to claim 1, characterized in that: The method also includes a data recording and analysis system for recording key parameters in the ironmaking process and analyzing the data to optimize the ironmaking process.

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