A furnace temperature control system for a rare earth electrolysis furnace

Abstract

This invention discloses a furnace temperature control system for a rare earth electrolysis furnace, relating to the rare earth field. It solves the technical problem that existing rare earth electrolysis temperature control systems use a uniform temperature control mode and fail to provide differentiated control for the varying process requirements at different stages. The control system includes a monitoring module, a segmented temperature control module, and a controller. The monitoring module is located within the first chamber of the rare earth electrolysis furnace. The segmented temperature control module includes a water-cooling circuit and multiple heating rods, all of which are fixedly installed on the inner wall of the first chamber. A water tank is connected to the water-cooling circuit, and an electrically controlled water pump is installed on the water-cooling circuit. Both the monitoring module and the electrically controlled water pump are electrically connected to the controller. The real-time furnace temperature is acquired through the monitoring module, and the segmented temperature control strategy is triggered based on this real-time temperature to control the segmented temperature control module and adjust the furnace temperature. This invention reduces furnace temperature fluctuations through segmented, precise temperature control.

Description

Technical Field

[0001] This invention relates to the field of rare earths, and more specifically, to a furnace temperature control system for a rare earth electrolysis furnace. Background Technology

[0002] Currently, China's rare earth electrolysis technology has become one of the most important technologies in the global rare earth industry. Existing electrolysis furnaces include a stirrer, anode, and cathode. Traditional temperature control systems in current rare earth electrolysis processes adopt a uniform, "one-size-fits-all" temperature control mode, failing to differentiate control according to the process requirements of each stage. This results in several prominent problems: First, the preheating stage uses fixed low-to-medium power heating, leading to a slow heating rate, prolonging the overall operation cycle, and incurring significant heat loss in the first chamber during preheating, resulting in a high proportion of ineffective energy consumption. Second, the isothermal electrolysis stage simply maintains the temperature without considering parameters such as gas concentration in the electrolysis reaction, leading to large furnace temperature fluctuations. This not only affects the quality of the electrolytic products but also creates redundant heating power, resulting in high energy consumption. Third, the cooling stage uses a single cooling rate, which either cools too quickly, causing furnace lining cracking and product oxidation, or cools too slowly, affecting subsequent discharge efficiency, exhibiting significant temperature control lag. Therefore, it cannot meet the development needs of green metallurgy and efficient production. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a furnace temperature control system for rare earth electrolysis furnaces, which addresses the shortcomings of existing technologies by adopting a uniform temperature control mode and failing to provide differentiated control for the process requirements at each stage.

[0004] The present invention discloses a furnace temperature control system for a rare earth electrolysis furnace. The control system includes a monitoring module, a segmented temperature control module, and a controller. The monitoring module is disposed in the first cavity of the rare earth electrolysis furnace. The segmented temperature control module includes a water-cooling circuit and multiple heating rods. The water-cooling circuit is disposed on the inner wall of the second cavity of the rare earth electrolysis furnace. The multiple heating rods are fixedly installed on the inner wall of the first cavity. The water tank is connected to the water-cooling circuit. An electrically controlled water pump is provided on the water-cooling circuit. The monitoring module and the electrically controlled water pump are both electrically connected to the controller. The monitoring module acquires the real-time furnace temperature, and the segmented temperature control strategy is triggered based on the real-time furnace temperature to control the segmented temperature control module to adjust the furnace temperature.

[0005] As a further improvement, the segmented temperature control strategy involves acquiring the holding time and setting preheating conditions, constant-temperature electrolysis conditions, holding and slow cooling conditions, discharge cooling conditions, preheating requirements, constant-temperature electrolysis requirements, holding and slow cooling requirements, and discharge cooling requirements based on the real-time furnace temperature and holding time. When the preheating conditions meet the preheating requirements, the preheating measures are triggered; when the constant-temperature electrolysis conditions meet the constant-temperature electrolysis requirements, the constant-temperature electrolysis measures are triggered; when the holding and slow cooling conditions meet the holding and slow cooling requirements, the holding and slow cooling measures are triggered; and when the discharge cooling conditions meet the discharge cooling requirements, the discharge cooling measures are triggered.

[0006] Furthermore, the method for setting the preheating conditions and preheating requirements is as follows: obtain the real-time room temperature, compare the real-time furnace temperature with the real-time room temperature and the electrolysis critical temperature respectively, and the preheating conditions include whether the real-time furnace temperature is greater than the real-time room temperature and whether the real-time furnace temperature is less than the electrolysis critical temperature. The preheating temperature requirement is that the real-time furnace temperature is greater than the real-time room temperature but less than the critical electrolysis temperature.

[0007] Furthermore, the preheating and temperature-raising measures are as follows: A first heating temperature range, a second heating temperature range, and a third heating temperature range are set. The real-time furnace temperature is compared with the first heating temperature range, the second heating temperature range, and the third heating temperature range, respectively. When the real-time furnace temperature is within the first heating temperature range, the power of the heating rod is set to a preset first heating power; when the real-time furnace temperature is within the second heating temperature range, the power of the heating rod is set to a preset second heating power; and when the real-time furnace temperature is within the third heating temperature range, the power of the heating rod is set to a preset third heating power.

[0008] Furthermore, the method for setting the constant temperature electrolysis conditions and requirements is as follows: according to the rare earth category, a holding time threshold is calibrated, a first target furnace temperature range is set, the holding time is compared with the holding time threshold, and the real-time furnace temperature is compared with the first target furnace temperature range. The constant temperature electrolysis conditions include whether the real-time furnace temperature is within the first target furnace temperature range and whether the holding time is less than the holding time threshold. The isothermal electrolysis requires that the real-time furnace temperature be within the first target furnace temperature range and the holding time be less than the holding time threshold.

[0009] Furthermore, the constant-temperature electrolysis measure is as follows: The monitoring module acquires the CO2 concentration during the electrolysis process, sets a CO2 concentration threshold, and calculates the CO2 concentration difference by subtracting the CO2 concentration from the CO2 concentration threshold. A target furnace temperature and a target furnace temperature difference threshold are set, and the target furnace temperature difference is calculated by subtracting the real-time furnace temperature from the target furnace temperature. The target furnace temperature difference is compared with the target furnace temperature difference threshold. If the target furnace temperature difference is greater than the target furnace temperature difference threshold, the target furnace temperature difference is then subtracted from the target furnace temperature difference threshold to obtain the target temperature difference value. A fourth heating power is calculated based on the target temperature difference value and the CO2 concentration difference, and the power of the heating rod is set to the fourth heating power. The expression for calculating the fourth heating power is: ； in, P 4 represents the fourth heating power. P 0 represents the initial power of the heater. k t The temperature-power proportionality coefficient, ΔT is the target temperature difference, and T is the power-temperature ratio coefficient. 目标 For the target furnace temperature, k CO2 The carbon dioxide concentration-power proportionality coefficient, C CO2 For CO2 concentration difference, C CO2阈值 This represents the CO2 concentration threshold.

[0010] Furthermore, the method for setting the aforementioned heat preservation and slow cooling conditions and requirements is as follows: Set a second target furnace temperature range and a first target holding time range, compare the real-time furnace temperature with the second target furnace temperature range, compare the holding time with the first target holding time range, and the holding and slow cooling conditions include whether the real-time furnace temperature is within the second target furnace temperature range and whether the holding time is within the second target holding time range. The heat preservation and slow cooling requirements are that the real-time furnace temperature is within the second target furnace temperature range and the heat preservation time is within the first target heat preservation time range.

[0011] Furthermore, the aforementioned heat preservation and slow cooling measures are as follows: A first cooling temperature range and a second cooling temperature range are set. When the real-time furnace temperature is in the first cooling temperature range, the power of the heating rod is set to a preset fifth heating power; when the real-time furnace temperature is in the second cooling temperature range, the power of the heating rod is set to a preset sixth heating power.

[0012] Furthermore, the method for setting the discharge cooling conditions and discharge cooling requirements is as follows: Set a third target furnace temperature range and a second target holding time range, compare the target furnace temperature with the third target furnace temperature range, compare the holding time with the second target holding time range, and the discharge cooling conditions include whether the real-time furnace temperature is within the third target furnace temperature range and whether the holding time is within the second target holding time range. The discharge cooling requirement is that the real-time furnace temperature is within the third target furnace temperature range and the holding time is within the second target holding time range.

[0013] Furthermore, the discharge cooling measure is as follows: Stop the operation of the heating rod and set the power of the electrically controlled water pump to the rated power; when the real-time furnace temperature equals the preset target discharge temperature, turn off the electrically controlled water pump.

[0014] Beneficial effects The advantages of this invention are: 1. The present invention uses high-power gradient heating in the preheating stage, which improves the heating rate and effectively shortens the preheating time; and uses efficient gradient cooling in the cooling stage to avoid cooling lag, shorten the overall operation cycle, and improve the continuity of the production line and the scale of production.

[0015] 2. This invention reduces furnace temperature fluctuations through segmented precise temperature control, effectively controls furnace temperature fluctuations during the constant temperature stage, effectively improves the purity of rare earth metals and current efficiency, reduces problems such as product oxidation and agglomeration, and improves product quality stability; at the same time, it alleviates thermal stress on the furnace lining, extends the service life of the electrolytic furnace, and reduces equipment maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the furnace temperature control system for the rare earth electrolytic furnace of the present invention; Figure 2 This is a flowchart of the furnace temperature control method for the rare earth electrolysis furnace of the present invention.

[0017] The components are: 1-monitoring module, 2-first chamber, 3-water cooling circuit, 4-heating rod, 5-mixer, 6-feed pipe, 7-water tank, 8-exhaust pipe, 9-anode, 10-cathode, 11-one-way valve, 12-electrically controlled water pump, and 13-second chamber. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention. See Figures 1-2 The present invention provides a furnace temperature control system for a rare earth electrolysis furnace, such as... Figure 1As shown, the control system includes a monitoring module 1, a segmented temperature control module, and a controller. The monitoring module is installed in the first cavity 2 of the rare earth electrolysis furnace, and both the segmented temperature control module and the monitoring module 1 are electrically connected to the controller.

[0019] Monitoring module 1 includes a gas concentration sensor and a temperature sensor. The gas concentration sensor is used to obtain the CO2 concentration in the first chamber 2, and the temperature sensor is used to obtain the real-time furnace temperature. Monitoring module 1 also includes a housing, which is fixedly installed on the inner wall above the first chamber 2. The housing is made of high-temperature and high-pressure resistant materials. The gas concentration sensor is a Songbai 4NCO2 carbon dioxide sensor, and the temperature sensor is a Fluke 5624 precision high-temperature platinum resistance thermometer.

[0020] The segmented temperature control module includes a water-cooled circuit 3 and multiple heating rods 4. The water-cooled circuit 3 is installed on the inner wall of the second cavity 13 of the rare earth electrolysis furnace. The multiple heating rods 4 are all fixedly installed on the inner wall of the first cavity 2. The water tank 7 is connected to the water-cooled circuit 3. An electrically controlled water pump 12 is provided on the water-cooled circuit 3. The heating rods 4 and the electrically controlled water pump 12 are all electrically connected to the controller.

[0021] like Figure 2 As shown, the real-time furnace temperature is obtained through monitoring module 1, and the segmented temperature control strategy is triggered based on the real-time furnace temperature to control the segmented temperature control module to adjust the furnace temperature.

[0022] The segmented temperature control strategy involves acquiring the holding time and setting preheating conditions, constant-temperature electrolysis conditions, holding and slow cooling conditions, discharge cooling conditions, preheating requirements, constant-temperature electrolysis requirements, holding and slow cooling requirements, and discharge cooling requirements based on the real-time furnace temperature and holding time. When the preheating conditions meet the preheating requirements, the preheating measures are triggered; when the constant-temperature electrolysis conditions meet the constant-temperature electrolysis requirements, the constant-temperature electrolysis measures are triggered; when the holding and slow cooling conditions meet the holding and slow cooling requirements, the holding and slow cooling measures are triggered; and when the discharge cooling conditions meet the discharge cooling requirements, the discharge cooling measures are triggered.

[0023] The method for setting preheating conditions and requirements is as follows: obtain the real-time room temperature, and compare the real-time furnace temperature with both the real-time room temperature and the electrolysis critical temperature. Preheating conditions include whether the real-time furnace temperature is greater than the real-time room temperature and whether it is less than the electrolysis critical temperature. Preheating requirements stipulate that the real-time furnace temperature is greater than the real-time room temperature and less than the electrolysis critical temperature. The electrolysis critical temperature is 1000-1100℃ for fluoride systems and 850-950℃ for chloride systems.

[0024] The preheating and temperature rise measures employ a high-power gradient heating strategy.

[0025] The system sets three heating temperature ranges: a first, a second, and a third. The real-time furnace temperature is compared to each of these ranges. When the real-time furnace temperature falls within the first heating temperature range, the power of heating rod 4 is set to a preset first heating power to rapidly increase the furnace temperature. When the real-time furnace temperature falls within the second heating temperature range, the power of heating rod 4 is set to a preset second heating power to reduce heat loss from the furnace body. When the real-time furnace temperature falls within the third heating temperature range, the power of the heating rod is set to a preset third heating power to smoothly transition to the constant temperature stage and prevent sudden temperature increases that could damage the furnace lining.

[0026] The heating temperature range is as follows: the first heating temperature range is from room temperature to 500℃, and the first heating power is 80% of the rated power of heating rod 4; the second heating temperature range is from 500℃ to 100℃ before the critical temperature, and the second heating power is 60% of the rated power of heating rod 4; the third heating temperature range is from 100℃ before the critical temperature to the preset target furnace temperature, and the second heating power is 40% of the rated power of heating rod 4. High-power gradient heating is used in the preheating stage, which effectively increases the heating rate and shortens the preheating time.

[0027] The method for setting the isothermal electrolysis conditions and requirements is as follows: Based on the rare earth category, a holding time threshold is calibrated; a first target furnace temperature range is set; the holding time is compared with the holding time threshold; and the real-time furnace temperature is compared with the first target furnace temperature range. The isothermal electrolysis conditions include whether the real-time furnace temperature is within the first target furnace temperature range and whether the holding time is less than the holding time threshold. The first target furnace temperature range is within ±5℃ of the electrolysis critical temperature. The holding time threshold is 12 hours.

[0028] The requirements for isothermal electrolysis are that the real-time furnace temperature is within the first target furnace temperature range and the holding time is less than the holding time threshold. The core objective is to ensure the stability of the electrolysis reaction and improve product purity and current efficiency.

[0029] The constant temperature electrolysis method is as follows: The monitoring module acquires the CO2 concentration during the electrolysis process, sets a CO2 concentration threshold, and calculates the CO2 concentration difference by subtracting the CO2 concentration from the CO2 concentration threshold. It also sets a target furnace temperature and a target furnace temperature difference threshold, calculates the target furnace temperature difference by subtracting the real-time furnace temperature from the target furnace temperature, compares the target furnace temperature difference with the target furnace temperature difference threshold, and calculates the target temperature difference value by subtracting the target furnace temperature difference from the target furnace temperature difference threshold again when the target furnace temperature difference is greater than the target furnace temperature difference threshold. Finally, it calculates the fourth heating power based on the target temperature difference value and the CO2 concentration difference, and sets the power of heating rod 4 to the fourth heating power. The expression for calculating the fourth heating power is: ; in, P4 represents the fourth heating power. P 0 represents the initial power of the heater. k t The temperature-power proportionality coefficient, ΔT is the target temperature difference, and T is the power-temperature ratio coefficient. 目标 For the target furnace temperature, k CO2 The carbon dioxide concentration-power proportionality coefficient, C CO2 For CO2 concentration difference, C CO2阈值 The CO2 concentration threshold is used. In this embodiment, the carbon dioxide concentration-power ratio is 0.01. The temperature-power ratio is 0.05.

[0030] When the furnace temperature is too high (exceeding the target value by 3°C), the heating power is appropriately reduced, and the exhaust volume is finely adjusted to accelerate the discharge of high-temperature gas. When the furnace temperature is too low (below the target value by 3°C), the heating power is increased, and the exhaust volume is reduced to retain the heat released by the reaction inside the furnace, so as to achieve precise and stable furnace temperature, with fluctuations controlled within ±5°C of the electrolysis critical temperature.

[0031] The method for setting the conditions and requirements for heat preservation and slow cooling is as follows: A second target furnace temperature range and a first target holding time range are set. The real-time furnace temperature is compared with the second target furnace temperature range, and the holding time is compared with the first target holding time range. The holding and slow cooling conditions include whether the real-time furnace temperature is within the second target furnace temperature range and whether the holding time is within the second target holding time range. In this embodiment, the second target furnace temperature range is 800-850℃, and the first target holding time range is 2-4h.

[0032] The requirements for heat preservation and slow cooling are that the real-time furnace temperature is within the second target furnace temperature range and the heat preservation time is within the first target heat preservation time range. The core objective is to alleviate the thermal stress of the furnace lining, prevent furnace body cracking, and reduce product oxidation.

[0033] The heat preservation and slow cooling measures are as follows: A first cooling temperature range and a second cooling temperature range are set. When the real-time furnace temperature is within the first cooling temperature range, the power of the heating rod is set to a preset fifth heating power; when the real-time furnace temperature is within the second cooling temperature range, the power of the heating rod is set to a preset sixth heating power. In this embodiment, the first cooling temperature range is 850-825℃, and the second cooling temperature range is 825℃-800℃. The fifth heating power is 20% of the rated power of the heating rod 4, and the sixth heating power is 5% of the rated power of the heating rod 4.

[0034] The method for setting discharge cooling conditions and discharge cooling requirements is as follows: A third target furnace temperature range and a second target holding time range are set. The target furnace temperature is compared with the third target furnace temperature range, and the holding time is compared with the second target holding time range. The discharge cooling conditions include whether the real-time furnace temperature is within the third target furnace temperature range and whether the holding time is within the second target holding time range. In this embodiment, the third target furnace temperature range is 400-500℃, and the second target holding time range is 1 hour.

[0035] The discharge cooling requirement is that the real-time furnace temperature is within the third target furnace temperature range and the holding time is within the second target holding time range. The core objective is to quickly reach the discharge conditions and improve operational continuity.

[0036] The discharge cooling measure employs a rapid and efficient cooling strategy. The heating rod 4 is stopped, and the power of the electrically controlled water pump 12 is set to its rated power. A target discharge temperature is set, and the real-time furnace temperature is compared with the target discharge temperature. When the real-time furnace temperature equals the target discharge temperature, the electrically controlled water pump 12 is shut off. An automatic discharge prompt is issued to prevent over- or under-cooling and improve discharge efficiency.

[0037] Segmented precise temperature control reduces furnace temperature fluctuations. Effective control of furnace temperature fluctuations during the constant temperature phase improves rare earth metal purity and current efficiency, reduces product oxidation and agglomeration, and enhances product quality stability. Simultaneously, it alleviates thermal stress on the furnace lining, extends its service life, and reduces equipment maintenance costs. It boasts strong adaptability and a wide range of applications: it can be directly applied to new production lines of various rare earth electrolysis furnaces (fluoride systems, chloride systems), and can also be used for energy-saving retrofits of existing production lines without large-scale equipment replacement. Adaptable to the production needs of different rare earth categories, it is highly versatile and has broad application prospects.

[0038] High level of intelligence reduces operating costs: Intelligent linkage control throughout the entire process reduces manual intervention and the labor intensity of operators; comprehensive abnormality early warning and data storage functions facilitate staff to troubleshoot faults, optimize processes, and improve the stability and management efficiency of production line operation.

[0039] The first chamber 2 is equipped with a feed pipe 6 and an exhaust pipe 8. The exhaust pipe 8 is connected to an external waste gas treatment device. Both the feed pipe 6 and the exhaust pipe 8 are equipped with one-way valves 11 on the pipes connecting to the rare earth electrolysis furnace to prevent waste gas from flowing back during electrolysis.

[0040] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A furnace temperature control system for a rare earth electrolysis furnace, characterized in that, The control system includes a monitoring module (1), a segmented temperature control module, and a controller. The monitoring module (1) is located in the first cavity (2) of the rare earth electrolysis furnace. The segmented temperature control module includes a water-cooling circuit (3) and multiple heating rods (4). The multiple heating rods (4) are fixedly installed on the inner wall of the first cavity (2). The water-cooling circuit (3) is located on the inner wall of the second cavity (13) of the rare earth electrolysis furnace. The water tank (7) is connected to the water-cooling circuit (3). An electrically controlled water pump (12) is provided on the water-cooling circuit (3). The monitoring module (1) and the electrically controlled water pump (12) are both electrically connected to the controller. The real-time furnace temperature is obtained through the monitoring module (1), and the segmented temperature control strategy is triggered according to the real-time furnace temperature to control the segmented temperature control module to adjust the furnace temperature.

2. The furnace temperature control system for a rare earth electrolytic furnace according to claim 1, characterized in that, The segmented temperature control strategy involves acquiring the holding time and setting preheating conditions, constant-temperature electrolysis conditions, holding and slow cooling conditions, discharge cooling conditions, preheating requirements, constant-temperature electrolysis requirements, holding and slow cooling requirements, and discharge cooling requirements based on the real-time furnace temperature and holding time. When the preheating conditions meet the preheating requirements, preheating measures are triggered; when the constant-temperature electrolysis conditions meet the constant-temperature electrolysis requirements, constant-temperature electrolysis measures are triggered; when the holding and slow cooling conditions meet the holding and slow cooling requirements, holding and slow cooling measures are triggered; and when the discharge cooling conditions meet the discharge cooling requirements, discharge cooling measures are triggered.

3. The furnace temperature control system for a rare earth electrolytic furnace according to claim 2, characterized in that, The method for setting the preheating and heating conditions and preheating requirements is as follows: obtain the real-time room temperature, compare the real-time furnace temperature with the real-time room temperature and the electrolysis critical temperature respectively, and the preheating and heating conditions include whether the real-time furnace temperature is greater than the real-time room temperature and whether the real-time furnace temperature is less than the electrolysis critical temperature. The preheating temperature requirement is that the real-time furnace temperature is greater than the real-time room temperature but less than the critical electrolysis temperature.

4. The furnace temperature control system for a rare earth electrolytic furnace according to claim 3, characterized in that, The preheating and temperature rise measures are as follows: Set a first heating temperature range, a second heating temperature range, and a third heating temperature range. Compare the real-time furnace temperature with the first heating temperature range, the second heating temperature range, and the third heating temperature range, respectively. When the real-time furnace temperature is in the first heating temperature range, set the power of the heating rod (4) to a preset first heating power. When the real-time furnace temperature is in the second heating temperature range, set the power of the heating rod (4) to a preset second heating power. When the real-time furnace temperature is in the third heating temperature range, set the power of the heating rod to a preset third heating power.

5. The furnace temperature control system for a rare earth electrolytic furnace according to claim 2, characterized in that, The method for setting the constant temperature electrolysis conditions and requirements is as follows: calibrate the holding time threshold according to the rare earth category, set a first target furnace temperature range, compare the holding time with the holding time threshold, and compare the real-time furnace temperature with the first target furnace temperature range. The constant temperature electrolysis conditions include whether the real-time furnace temperature is within the first target furnace temperature range and whether the holding time is less than the holding time threshold. The isothermal electrolysis requires that the real-time furnace temperature be within the first target furnace temperature range and the holding time be less than the holding time threshold.

6. The furnace temperature control system for a rare earth electrolytic furnace according to claim 5, characterized in that, The constant temperature electrolysis measure is as follows: The CO2 concentration during the electrolysis process is obtained through the monitoring module, a CO2 concentration threshold is set, and the difference between the CO2 concentration and the CO2 concentration threshold is obtained. Set the target furnace temperature and the target furnace temperature difference threshold, and obtain the target furnace temperature difference by subtracting the real-time furnace temperature from the target furnace temperature. Compare the target furnace temperature difference with the target furnace temperature difference threshold. When the target furnace temperature difference is greater than the target furnace temperature difference threshold, subtract the target furnace temperature difference from the target furnace temperature difference threshold to obtain the target temperature difference value. Calculate the fourth heating power based on the target temperature difference value and the CO2 concentration difference, and set the power of the heating rod (4) to the fourth heating power. The expression for calculating the fourth heating power is: ； in, P 4 represents the fourth heating power. P 0 represents the initial power of the heater. k t The temperature-power proportionality coefficient, ΔT is the target temperature difference, and T is the power-temperature ratio coefficient. 目标 For the target furnace temperature, k CO2 The carbon dioxide concentration-power proportionality coefficient, C CO2 For CO2 concentration difference, C CO2阈值 This represents the CO2 concentration threshold.

7. The furnace temperature control system for a rare earth electrolytic furnace according to claim 2, characterized in that, The method for setting the aforementioned heat preservation and slow cooling conditions and requirements is as follows: Set a second target furnace temperature range and a first target holding time range, compare the real-time furnace temperature with the second target furnace temperature range, compare the holding time with the first target holding time range, and the holding and slow cooling conditions include whether the real-time furnace temperature is within the second target furnace temperature range and whether the holding time is within the second target holding time range. The heat preservation and slow cooling requirements are that the real-time furnace temperature is within the second target furnace temperature range and the heat preservation time is within the first target heat preservation time range.

8. The furnace temperature control system for a rare earth electrolytic furnace according to claim 7, characterized in that, The heat preservation and slow cooling measures are as follows: A first cooling temperature range and a second cooling temperature range are set. When the real-time furnace temperature is in the first cooling temperature range, the power of the heating rod (4) is set to a preset fifth heating power. When the real-time furnace temperature is in the second cooling temperature range, the power of the heating rod (4) is set to a preset sixth heating power.

9. The furnace temperature control system for a rare earth electrolytic furnace according to claim 2, characterized in that, The method for setting the discharge cooling conditions and discharge cooling requirements is as follows: Set a third target furnace temperature range and a second target holding time range, compare the target furnace temperature with the third target furnace temperature range, compare the holding time with the second target holding time range, and the discharge cooling conditions include whether the real-time furnace temperature is within the third target furnace temperature range and whether the holding time is within the second target holding time range. The discharge cooling requirement is that the real-time furnace temperature is within the third target furnace temperature range and the holding time is within the second target holding time range.

10. The furnace temperature control system for a rare earth electrolytic furnace according to claim 9, characterized in that, The material discharge cooling measure is as follows: Stop the operation of the heating rod (4), set the power of the electric water pump (12) to the rated power of the electric water pump (12); set the target discharge temperature, compare the real-time furnace temperature with the target discharge temperature, and when the real-time furnace temperature is equal to the target discharge temperature, turn off the electric water pump (12).

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