Furnace baking method for new intermediate frequency furnace

Abstract

The invention relates to the technical field of ferrous metallurgy, and discloses a furnace baking method for a new intermediate frequency furnace, which comprises the following steps: a, adding 1-2 tons of high-carbon ferro-chrome or ferro-nickel into the bottom of the new intermediate frequency furnace, and paving a layer of refractory material with the thickness of 50-100mm on the high-carbon ferro-chrome or ferro-nickel; b, an infrared heater is used for preheating the intermediate frequency furnace, the infrared heater has an adjustable radiation wavelength range, and the temperature rising speed is controlled to be 3-3.5 DEG C / min; c, when the furnace temperature reaches 800-900 DEG C, liquid molten steel preheated to 1400-1550 DEG C is injected into the furnace, and an electromagnetic induction heating system of the intermediate frequency furnace is started at the same time; according to the method, 1-2 tons of high-carbon ferro-chrome or ferro-nickel is added to the furnace bottom, the refractory material is laid on the high-carbon ferro-chrome or ferro-nickel, and the refractory material is preheated before being laid, so that the initial stability of the refractory material is effectively improved, the furnace bottom is protected from high-temperature erosion, and the service life of the furnace is prolonged. And the radiation wavelength range of the infrared heater can better penetrate through the furnace wall, so that the heating efficiency is improved, and the preheating time is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for baking a new medium frequency furnace. Background Art

[0002] Medium frequency furnace is a kind of equipment widely used in the steel and metallurgical industry for smelting various metal materials. Before the first use of a new furnace, it needs to be baked to ensure that the lining material is fully sintered and to improve the service life and working performance of the furnace. The traditional baking method usually includes the following steps: adding a certain amount of filling material to the bottom of the furnace, then preheating, then adding liquid metal and gradually increasing the power, and finally heat preservation. However, these traditional methods have the following problems: Traditional furnace baking methods often ignore the protective effect of refractory materials, which makes the furnace bottom susceptible to high temperature erosion and affects the service life of the furnace. Traditional preheating methods usually use ordinary electric heaters, which have low heating efficiency and take a long time.

[0003] Traditional temperature and pressure monitoring methods are relatively simple and cannot achieve precise control, which may lead to uneven temperature distribution in the furnace, affecting the quality of molten steel and the safe operation of the furnace. The traditional way of increasing power is usually to directly increase the power to the maximum value, which is easy to cause damage to the furnace structure and affect the stability and safety of the furnace. Summary of the invention

[0004] The purpose of the present invention is to provide a method for baking a new medium frequency furnace to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A method for baking a new medium frequency furnace comprises the following steps: The steps include: a. Add 1-2 tons of high carbon ferrochrome or ferronickel to the bottom of the new medium frequency furnace, and lay a layer of 50-100mm thick refractory material on it; b. Preheat the medium frequency furnace using an infrared heater, wherein the infrared heater has an adjustable radiation wavelength range and the heating rate is controlled at 3-3.5°C / min; c. When the furnace temperature reaches 800-900°C, the liquid steel preheated to 1400-1550°C is injected into the furnace, and the electromagnetic induction heating system of the medium frequency furnace is started at the same time. The temperature of the liquid steel is monitored in real time by an online temperature measuring instrument to ensure that its temperature is maintained between 1400-1550°C; Add an appropriate amount of deoxidizer to the liquid molten steel to remove oxygen from the molten steel and improve the quality of the molten steel; d. After the molten steel is poured, gradually increase the power of the medium frequency furnace to the maximum, with each increase not exceeding 10% of the total power until the maximum power is reached; The pressure sensor installed on the top of the furnace monitors the pressure change in the furnace to ensure the stability of the pressure in the furnace. The accuracy of the pressure sensor is ±0.1kPa and the sampling frequency is once per minute; e. After the temperature stabilizes at 1650-1700°C, an intermittent heating mode is used to keep the temperature for 1 hour. The intermittent heating mode is to heat for 5 minutes every 10 minutes and pause for 5 minutes to promote the full sintering of the furnace lining material; f. Finally, perform the operation of shaking the furnace to tap steel.

[0006] Preferably, the refractory material used in step a is preferably a magnesia refractory material, which has excellent high temperature resistance and can effectively protect the furnace bottom from high temperature erosion.

[0007] Preferably, the infrared heater used in step b has a radiation wavelength range of 2-4 μm, which can better penetrate the furnace wall and improve heating efficiency.

[0008] Preferably, the online thermometer used in step c has the characteristics of high precision and fast response, with a temperature measurement error of less than ±1°C and a response time of less than 1 second.

[0009] Preferably, the gradual increase in power in step d adopts a gradient increase method, with each increase not exceeding 10% of the total power until the maximum power is reached, so as to avoid damage to the furnace structure due to sudden increase in power.

[0010] Preferably, the intermittent heating mode in step e effectively reduces energy consumption while ensuring the consistency of the temperature in the furnace, which helps to improve the service life and performance of the furnace lining material.

[0011] Preferably, during the entire baking process, the temperature and time parameters of each stage are automatically adjusted by a computer control system to ensure accurate control of the process. The computer control system has fault diagnosis and alarm functions to take timely measures under abnormal circumstances.

[0012] Preferably, the deoxidizer is aluminum or ferrosilicon, and the added amount is 0.1%-0.5% of the weight of the molten steel. The deoxidizer can not only remove oxygen in the molten steel, but also improve the fluidity and casting performance of the molten steel, thereby improving the quality of the final product.

[0013] Preferably, the pressure sensor used in step d is installed at the center of the furnace top to accurately monitor the pressure changes in the furnace. The data of the pressure sensor is sent to the control room in real time via wireless transmission to facilitate remote monitoring.

[0014] Preferably, the refractory material layer laid in step a is preheated before laying, with the preheating temperature being 200-300° C. and the preheating time being 1-2 hours, so as to improve the initial stability of the refractory material.

[0015] The present invention has at least the following beneficial effects: (1) This scheme adds 1-2 tons of high-carbon ferrochrome or ferronickel to the bottom of the furnace and lays a 50-100mm thick layer of refractory material on it, especially magnesium refractory material. The refractory material is preheated before laying, the preheating temperature is 200-300℃, and the preheating time is 1-2 hours, which effectively improves the initial stability of the refractory material, protects the furnace bottom from high temperature erosion, and extends the service life of the furnace. An infrared heater with a radiation wavelength range of 2-4μm is used for preheating, and the heating rate is controlled at 3-3.5℃ / min. The radiation wavelength range of the infrared heater can better penetrate the furnace wall, improve heating efficiency, and shorten the preheating time.

[0016] (2) This solution uses a high-precision online thermometer to monitor the temperature of liquid steel in real time. The temperature measurement error is less than ±1°C and the response time is less than 1 second, ensuring that the temperature of the molten steel is maintained between 1400-1550°C, thereby improving the quality of the molten steel.

[0017] (3) This scheme uses a gradient increase method to gradually increase the power, with each increase not exceeding 10% of the total power until the maximum power is reached. This power increase method avoids damage to the furnace structure caused by a sudden increase in power, and ensures the stability and safety of the furnace.

[0018] (4) After the temperature stabilizes at 1650-1700℃, this scheme adopts intermittent heating mode to keep warm for 1 hour. The intermittent heating mode is to heat for 5 minutes every 10 minutes and pause for 5 minutes. This heating mode effectively reduces energy consumption, while ensuring the consistency of the temperature in the furnace and promoting the full sintering of the furnace lining material.

[0019] (5) This solution uses a high-precision pressure sensor to monitor the pressure changes in the furnace to ensure the stability of the pressure in the furnace. The pressure sensor has an accuracy of ±0.1kPa and a sampling frequency of once per minute. It monitors the pressure changes in the furnace in real time to ensure the safe operation of the furnace. DETAILED DESCRIPTION

[0020] The following will combine the contents in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1 The present invention provides a technical solution: a method for baking a new medium frequency furnace, comprising the following contents: Validation of the effect of using magnesium refractory materials and a standard infrared heater wavelength range.

[0022] step: Refractory material preparation and laying: Add 1.5 tons of high carbon ferrochrome into the bottom of the new medium frequency furnace.

[0023] A 75mm thick layer of magnesium refractory material is laid, and the refractory material is preheated at 250℃ for 1.5 hours before laying.

[0024] Preheating treatment: The medium frequency furnace is preheated using an infrared heater with a radiation wavelength of 3 μm.

[0025] The heating rate was controlled at 3.2°C / min until the furnace temperature reached 850°C.

[0026] Addition and heating of liquid steel: Liquid steel preheated to 1500°C is poured into the furnace.

[0027] Start the electromagnetic induction heating system of the medium frequency furnace to ensure that the temperature of the liquid steel is monitored in real time by an online temperature meter and maintained at 1500°C.

[0028] 0.3% aluminum is added to the liquid molten steel as a deoxidizer to remove oxygen from the molten steel and improve the quality of the molten steel.

[0029] Power adjustment and pressure monitoring: After the molten steel is poured, the power of the medium frequency furnace is gradually increased to the maximum by increasing the total power by 10% each time.

[0030] The pressure change in the furnace is monitored by a pressure sensor installed at the center of the furnace top to ensure pressure stability. The pressure sensor has an accuracy of ±0.1kPa and a sampling frequency of once per minute.

[0031] Intermittent heating: After the temperature stabilized at 1675°C, an intermittent heating mode of heating for 5 minutes and pausing for 5 minutes every 10 minutes was adopted to keep the temperature for 1 hour.

[0032] Steel tapping operation: After the insulation is completed, the shaking furnace and steel tapping operation are carried out.

[0033] result: The furnace lining material is fully sintered without any cracking.

[0034] The molten steel has excellent quality and good fluidity, and no inclusions or pores are detected.

[0035] The pressure in the furnace is stable and no abnormal fluctuations occur.

[0036] Example 2 Evaluate the effects of different deoxidizer types on molten steel quality and furnace lining materials.

[0037] step: Refractory material preparation and laying: Add 1.5 tons of high carbon ferrochrome into the bottom of the new medium frequency furnace.

[0038] A 75mm thick layer of magnesium refractory material is laid, and the refractory material is preheated at 250℃ for 1.5 hours before laying.

[0039] Preheating treatment: The medium frequency furnace is preheated using an infrared heater with a radiation wavelength of 3 μm.

[0040] The heating rate was controlled at 3.2°C / min until the furnace temperature reached 850°C.

[0041] Addition and heating of liquid steel: Liquid steel preheated to 1500°C is poured into the furnace.

[0042] Start the electromagnetic induction heating system of the medium frequency furnace to ensure that the temperature of the liquid steel is monitored in real time by an online temperature meter and maintained at 1500°C.

[0043] 0.4% ferrosilicon is added to the liquid molten steel as a deoxidizer to remove oxygen from the molten steel and improve its quality.

[0044] Power adjustment and pressure monitoring: After the molten steel is poured, the power of the medium frequency furnace is gradually increased to the maximum by increasing the total power by 10% each time.

[0045] The pressure change in the furnace is monitored by a pressure sensor installed at the center of the furnace top to ensure pressure stability. The pressure sensor has an accuracy of ±0.1kPa and a sampling frequency of once per minute.

[0046] Intermittent heating: After the temperature stabilized at 1675°C, an intermittent heating mode of heating for 5 minutes and pausing for 5 minutes every 10 minutes was adopted to keep the temperature for 1 hour.

[0047] Steel tapping operation: After the insulation is completed, the shaking furnace and steel tapping operation are carried out.

[0048] result: Using ferrosilicon as a deoxidizer can also achieve good molten steel quality and furnace lining material condition.

[0049] The fluidity of molten steel is slightly improved, and the casting performance is better.

[0050] The pressure in the furnace is stable and no abnormal fluctuations occur.

[0051] Example 3 The influence of different preheating temperatures on the stability of refractory materials was investigated.

[0052] step: Refractory material preparation and laying: Add 1 ton of nickel iron to the bottom of the new medium frequency furnace.

[0053] A 100mm thick layer of magnesium refractory material is laid, and the refractory material is preheated at 300℃ for 2 hours before laying.

[0054] Preheating treatment: The medium frequency furnace is preheated using an infrared heater with a radiation wavelength of 3 μm.

[0055] The heating rate was controlled at 3.2°C / min until the furnace temperature reached 850°C.

[0056] Addition and heating of liquid steel: Liquid steel preheated to 1500°C is poured into the furnace.

[0057] Start the electromagnetic induction heating system of the medium frequency furnace to ensure that the temperature of the liquid steel is monitored in real time by an online temperature meter and maintained at 1500°C.

[0058] 0.3% aluminum is added to the liquid molten steel as a deoxidizer to remove oxygen from the molten steel and improve the quality of the molten steel.

[0059] Power adjustment and pressure monitoring: After the molten steel is poured, the power of the medium frequency furnace is gradually increased to the maximum by increasing the total power by 10% each time.

[0060] The pressure change in the furnace is monitored by a pressure sensor installed at the center of the furnace top to ensure pressure stability. The pressure sensor has an accuracy of ±0.1kPa and a sampling frequency of once per minute.

[0061] Intermittent heating: After the temperature stabilized at 1675°C, an intermittent heating mode of heating for 5 minutes and pausing for 5 minutes every 10 minutes was adopted to keep the temperature for 1 hour.

[0062] Steel tapping operation: After the insulation is completed, the shaking furnace and steel tapping operation are carried out.

[0063] result: The higher preheating temperature improves the initial stability of the refractory material and the sintering effect of the furnace lining material is more significant.

[0064] The molten steel has excellent quality and good fluidity, and no inclusions or pores are detected.

[0065] The pressure in the furnace is stable and no abnormal fluctuations occur.

[0066] Example 4 Test the influence of different heating rates on the sintering effect of furnace lining materials.

[0067] step: Refractory material preparation and laying: Add 1.5 tons of high carbon ferrochrome into the bottom of the new medium frequency furnace.

[0068] A 75mm thick layer of magnesium refractory material is laid, and the refractory material is preheated at 250℃ for 1.5 hours before laying.

[0069] Preheating treatment: The medium frequency furnace is preheated using an infrared heater with a radiation wavelength of 2.5 μm.

[0070] The heating rate was controlled at 3.5°C / min until the furnace temperature reached 850°C.

[0071] Addition and heating of liquid steel: Liquid steel preheated to 1500°C is poured into the furnace.

[0072] Start the electromagnetic induction heating system of the medium frequency furnace to ensure that the temperature of the liquid steel is monitored in real time by an online temperature meter and maintained at 1500°C.

[0073] 0.3% aluminum is added to the liquid molten steel as a deoxidizer to remove oxygen from the molten steel and improve the quality of the molten steel.

[0074] Power adjustment and pressure monitoring: After the molten steel is poured, the power of the medium frequency furnace is gradually increased to the maximum by increasing the total power by 10% each time.

[0075] The pressure change in the furnace is monitored by a pressure sensor installed at the center of the furnace top to ensure pressure stability. The pressure sensor has an accuracy of ±0.1kPa and a sampling frequency of once per minute.

[0076] Intermittent heating: After the temperature stabilized at 1675°C, an intermittent heating mode of heating for 5 minutes and pausing for 5 minutes every 10 minutes was adopted to keep the temperature for 1 hour.

[0077] Steel tapping operation: After the insulation is completed, the shaking furnace and steel tapping operation are carried out.

[0078] result: The slightly higher heating rate did not affect the sintering effect of the furnace lining material, and the furnace lining material did not crack.

[0079] The molten steel has excellent quality and good fluidity, and no inclusions or pores are detected.

[0080] The pressure in the furnace is stable and no abnormal fluctuations occur.

[0081] Comparative Example 1 Purpose: To compare the situation without refractory preheating.

[0082] step: Refractory material preparation and laying: Add 1.5 tons of high carbon ferrochrome into the bottom of the new medium frequency furnace.

[0083] A 75 mm thick layer of magnesia refractory material is laid without preheating.

[0084] Preheating treatment: The medium frequency furnace is preheated using an infrared heater with a radiation wavelength of 3 μm.

[0085] The heating rate was controlled at 3.2°C / min until the furnace temperature reached 850°C.

[0086] Addition and heating of liquid steel: Liquid steel preheated to 1500°C is poured into the furnace.

[0087] Start the electromagnetic induction heating system of the medium frequency furnace to ensure that the temperature of the liquid steel is monitored in real time by an online temperature meter and maintained at 1500°C.

[0088] 0.3% aluminum is added to the liquid molten steel as a deoxidizer to remove oxygen from the molten steel and improve the quality of the molten steel.

[0089] Power adjustment and pressure monitoring: After the molten steel is poured, the power of the medium frequency furnace is gradually increased to the maximum by increasing the total power by 10% each time.

[0090] The pressure change in the furnace is monitored by a pressure sensor installed at the center of the furnace top to ensure pressure stability. The pressure sensor has an accuracy of ±0.1kPa and a sampling frequency of once per minute.

[0091] Intermittent heating: After the temperature stabilized at 1675°C, an intermittent heating mode of heating for 5 minutes and pausing for 5 minutes every 10 minutes was adopted to keep the temperature for 1 hour.

[0092] Steel tapping operation: After the insulation is completed, the shaking furnace and steel tapping operation are carried out.

[0093] result: The unpreheated refractory material will crack locally at high temperature, affecting the overall performance of the furnace lining material.

[0094] The quality of molten steel is affected, and a small amount of inclusions and pores appear.

[0095] The pressure in the furnace fluctuates slightly during certain periods.

[0096] Comparative Example 2 Check the oven effect in non-intermittent heating mode.

[0097] step: Refractory material preparation and laying: Add 1.5 tons of high carbon ferrochrome into the bottom of the new medium frequency furnace.

[0098] A 75mm thick layer of magnesium refractory material is laid, and the refractory material is preheated at 250℃ for 1.5 hours before laying.

[0099] Preheating treatment: The medium frequency furnace is preheated using an infrared heater with a radiation wavelength of 3 μm.

[0100] The heating rate was controlled at 3.2°C / min until the furnace temperature reached 850°C.

[0101] Addition and heating of liquid steel: Liquid steel preheated to 1500°C is poured into the furnace.

[0102] Start the electromagnetic induction heating system of the medium frequency furnace to ensure that the temperature of the liquid steel is monitored in real time by an online temperature meter and maintained at 1500°C.

[0103] 0.3% aluminum is added to the liquid molten steel as a deoxidizer to remove oxygen from the molten steel and improve the quality of the molten steel.

[0104] Power adjustment and pressure monitoring: After the molten steel is poured, the power of the medium frequency furnace is gradually increased to the maximum by increasing the total power by 10% each time.

[0105] The pressure change in the furnace is monitored by a pressure sensor installed at the center of the furnace top to ensure pressure stability. The pressure sensor has an accuracy of ±0.1kPa and a sampling frequency of once per minute.

[0106] Intermittent heating: After the temperature stabilized at 1675°C, heating was continued for 1 hour without using intermittent heating mode.

[0107] Steel tapping operation: After heating is completed, the furnace shaking and steel tapping operation is performed.

[0108] result: The furnace lining material failed to be fully sintered, resulting in uneven sintering in some areas.

[0109] The energy consumption is high, and compared with the embodiment, the energy consumption is increased by about 10%.

[0110] The uneven temperature distribution in the furnace causes a slight decrease in the quality of the molten steel and the appearance of a small amount of inclusions and pores.

[0111] The pressure in the furnace fluctuates slightly during certain periods.

[0112] In summary: Example 1 uses 75mm thick magnesia refractory materials and performs preheating treatment before laying, which improves the initial stability of the refractory materials and effectively protects the furnace bottom from high temperature erosion. An infrared heater with a radiation wavelength of 2-4μm is used, and the heating rate is controlled at 3.2℃ / min, which can better penetrate the furnace wall and improve the heating efficiency. The temperature of the liquid molten steel is monitored in real time by a high-precision online thermometer to ensure that the temperature remains at 1500℃, thereby ensuring the quality of the molten steel. The power is gradually increased, not exceeding 10% of the total power each time, to avoid sudden increase in power and damage to the furnace structure. An intermittent heating mode of heating for 5 minutes and pausing for 5 minutes every 10 minutes is adopted, which effectively reduces energy consumption, ensures the consistency of the temperature in the furnace, and promotes the full sintering of the furnace lining material. The pressure changes in the furnace are monitored by a high-precision pressure sensor to ensure that the pressure in the furnace is stable. The entire furnace baking process is automatically adjusted by a computer control system to ensure accurate control of the process, and has fault diagnosis and alarm functions.

[0113] Example 2 uses 80mm thick magnesia refractory materials and performs preheating treatment before laying, which improves the initial stability of the refractory materials and effectively protects the furnace bottom from high temperature erosion. An infrared heater with a radiation wavelength of 2-4μm is used, and the heating rate is controlled at 3.4℃ / min, which can better penetrate the furnace wall and improve the heating efficiency. The temperature of the liquid molten steel is monitored in real time by a high-precision online thermometer to ensure that the temperature is maintained at 1550℃, thereby ensuring the quality of the molten steel. The power is gradually increased, not exceeding 10% of the total power each time, to avoid sudden increase in power and damage to the furnace structure. An intermittent heating mode of heating for 6 minutes and pausing for 4 minutes every 10 minutes is adopted to effectively reduce energy consumption, while ensuring the consistency of the temperature in the furnace and promoting the full sintering of the lining material. The pressure changes in the furnace are monitored by a high-precision pressure sensor to ensure that the pressure in the furnace is stable. The entire furnace baking process is automatically adjusted by a computer control system to ensure accurate control of the process, and has fault diagnosis and alarm functions.

[0114] Example 3 uses 100mm thick magnesia refractory materials and performs preheating treatment before laying, which improves the initial stability of the refractory materials and effectively protects the furnace bottom from high temperature erosion. An infrared heater with a radiation wavelength of 2-4μm is used, and the heating rate is controlled at 3.1℃ / min, which can better penetrate the furnace wall and improve the heating efficiency. The temperature of the liquid molten steel is monitored in real time by a high-precision online thermometer to ensure that the temperature is maintained at 1450℃, thereby ensuring the quality of the molten steel. The power is gradually increased, not exceeding 10% of the total power each time, to avoid damage to the furnace structure caused by sudden increase in power. An intermittent heating mode of heating for 4 minutes and pausing for 6 minutes every 10 minutes is adopted, which effectively reduces energy consumption, ensures the consistency of the temperature in the furnace, and promotes the full sintering of the furnace lining material. The pressure changes in the furnace are monitored by a high-precision pressure sensor to ensure that the pressure in the furnace is stable. The entire furnace baking process is automatically adjusted by a computer control system to ensure accurate control of the process, and has fault diagnosis and alarm functions.

[0115] Comparative Example 1 has a higher heating rate (4.5°C / min), which shortens the preheating time and is suitable for occasions where rapid heating is required. No refractory material needs to be laid, which simplifies the preparation work and reduces the operation steps.

[0116] Comparative Example 2 uses 30 mm thick refractory materials, which reduces the cost of refractory materials and is suitable for situations with limited budgets. The intermittent heating mode of heating for 7 minutes and pausing for 3 minutes every 10 minutes has a longer heat preservation time, which helps to improve the sintering effect of the furnace lining material.

[0117] By comparison, it can be seen that the method in the embodiment shows significant advantages in refractory protection, heating efficiency, temperature and pressure control, power increase method and automatic control, effectively improves furnace efficiency, prolongs furnace service life, and ensures the quality of molten steel. Although the comparative example has the advantages of simplifying operation and reducing costs in some aspects, it has deficiencies in refractory protection, temperature uniformity and sintering effect of furnace lining materials.

[0118] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0119] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for baking a new medium frequency furnace, characterized in that: The steps include: a. Add 1-2 tons of high carbon ferrochrome or ferronickel to the bottom of the new medium frequency furnace, and lay a layer of 50-100mm thick refractory material on it; b. Preheat the medium frequency furnace using an infrared heater, wherein the infrared heater has an adjustable radiation wavelength range and the heating rate is controlled at 3-3.5°C / min; c. When the furnace temperature reaches 800-900°C, the liquid steel preheated to 1400-1550°C is injected into the furnace, and the electromagnetic induction heating system of the medium frequency furnace is started at the same time. The temperature of the liquid steel is monitored in real time by an online temperature measuring instrument to ensure that its temperature is maintained between 1400-1550°C; Adding an appropriate amount of deoxidizer to the liquid steel to remove oxygen from the steel; d. After the molten steel is poured, gradually increase the power of the medium frequency furnace to the maximum, with each increase not exceeding 10% of the total power until the maximum power is reached; The pressure sensor installed on the top of the furnace monitors the pressure change in the furnace to ensure the stability of the pressure in the furnace. The accuracy of the pressure sensor is ±0.1kPa and the sampling frequency is once per minute; e. After the temperature stabilizes at 1650-1700°C, an intermittent heating mode is used to keep the temperature for 1 hour. The intermittent heating mode is to heat for 5 minutes every 10 minutes and pause for 5 minutes to promote the full sintering of the furnace lining material; f. Finally, perform the operation of shaking the furnace to tap steel.

2. The method for baking a new medium frequency furnace according to claim 1, characterized in that: The refractory material used in step a is preferably a magnesia refractory material.

3. The method for baking a new medium frequency furnace according to claim 1, characterized in that: The infrared heater used in step b has a radiation wavelength in the range of 2-4 μm.

4. The method for baking a new medium frequency furnace according to claim 1, characterized in that: The online thermometer used in step c has a temperature measurement error of less than ±1°C and a response time of less than 1 second.

5. The method for baking a new medium frequency furnace according to claim 1, characterized in that: The gradual increase of power in step d adopts a gradient increase method, and each increase does not exceed 10% of the total power until the maximum power is reached.

6. The method for baking a new medium frequency furnace according to claim 1, characterized in that: The intermittent heating mode in step e effectively reduces energy consumption while ensuring the consistency of the temperature in the furnace, which helps to improve the service life and performance of the furnace lining material.

7. The method for baking a new medium frequency furnace according to claim 1, characterized in that: During the entire baking process, the temperature and time parameters of each stage are automatically adjusted by a computer control system to ensure accurate control of the process. The computer control system has fault diagnosis and alarm functions, and timely measures can be taken under abnormal circumstances.

8. The method for baking a new medium frequency furnace according to claim 1, characterized in that: The deoxidizer is aluminum or ferrosilicon, and the added amount is 0.1%-0.5% of the weight of the molten steel, and the deoxidizer is used to remove oxygen in the molten steel.

9. The method for baking a new medium frequency furnace according to claim 1, characterized in that: The pressure sensor used in step d is installed at the center of the furnace top to accurately monitor the pressure changes in the furnace. The data of the pressure sensor is sent to the control room in real time via wireless transmission to facilitate remote monitoring.

10. The method for baking a new medium frequency furnace according to claim 1, characterized in that: The refractory material layer laid in step a is preheated before laying, with the preheating temperature being 200-300° C. and the preheating time being 1-2 hours, in order to improve the initial stability of the refractory material.