Transformation operation method for liquid oxygen air pipe of volatilization kiln

Abstract

The invention relates to the technical field of non-ferrous metallurgy production, and discloses a volatilization kiln liquid oxygen air duct transformation operation method which comprises the following steps: S1, collecting real-time temperature change data in a volatilization kiln through a temperature sensor arranged in a furnace body; s2, the control system generates a preheating scheme according to the temperature data, wherein the preheating scheme comprises the steps of selecting the position of an oxygen injection point and setting the liquid oxygen injection amount and the air speed of an air pipe; and S3, the control system is started, the liquid oxygen injection system and the air pipe system are controlled, and a multi-stage cooling scheme is generated according to the development trend of the preheating scheme. By optimizing the combustion process and accurately controlling the temperature in the kiln, the energy waste caused by ring formation at the kiln opening is reduced, the coal consumption and the liquid oxygen use amount are reduced, the real-time adjusting function of an automatic control system is combined, the overall energy utilization rate of the system is improved, the production cost is further reduced, and long-term stable operation of the volatilization kiln is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of nonferrous metallurgical production, in particular to a method for transforming a liquid oxygen duct of a volatilization kiln. Background Art

[0002] Zinc volatilization kiln is a commonly used equipment in the metallurgical industry, mainly used for the refining and processing of metallic zinc. In the operation process of traditional zinc volatilization kiln, the temperature control and combustion efficiency in the kiln directly affect the production efficiency and product quality. However, the existing technology still has many shortcomings in practical application, especially in the kiln mouth ringing problem and temperature control, which need to be improved urgently.

[0003] First of all, kiln mouth ringing is a common problem in the operation of zinc volatilization kiln, which is usually formed around the kiln mouth due to the high temperature in the kiln. This ringing will not only hinder the normal flow of materials, but also cause the temperature at the kiln mouth to be too high or too low, further affecting the combustion process in the kiln and the volatilization efficiency of zinc. Traditional treatment methods usually rely on increasing the fuel ratio (such as increasing the amount of coal combustion) to burn the kiln mouth area red and soften the ringing, and then clean it with manual tools. This method is not only labor-intensive, but also increases fuel consumption, leading to increased production costs. In addition, frequent manual cleaning operations are also prone to damage the equipment and affect its service life.

[0004] Secondly, in the prior art, the temperature control of the zinc volatilization kiln mainly relies on a single air duct air supply system, which is difficult to achieve uniform temperature control in the kiln under complex operating conditions. The temperature in different areas of the kiln is uneven, especially at the kiln head and kiln tail, which is prone to excessively high or low temperatures, resulting in incomplete or excessive combustion, which not only affects the combustion efficiency, but also may cause the kiln mouth ringing problem. This uneven temperature distribution will increase energy consumption and is not conducive to the efficient volatilization of zinc, ultimately leading to reduced production efficiency.

[0005] To this end, those skilled in the art provide a method for modifying a liquid oxygen duct of a volatilization kiln to solve the problems raised in the above background technology. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a method for modifying the liquid oxygen duct of a volatilization kiln, which solves the problems of kiln mouth ringing and uncontrollable temperature control and combustion efficiency in the prior art.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for modifying a liquid oxygen duct of a volatilization kiln, comprising the following steps:

[0008] S1. Collect real-time temperature change data in the volatilization kiln through the temperature sensor arranged in the furnace body;

[0009] S2. The control system generates a preheating scheme according to the temperature data, wherein the preheating scheme includes selecting the position of the oxygen injection point, setting the liquid oxygen injection amount and the wind speed of the air duct;

[0010] S3. Start the control system and operate the liquid oxygen injection system and the air duct system, and generate a multi-stage cooling plan according to the development trend of the preheating plan.

[0011] Preferably, the air duct system includes an air valve capable of adjusting wind speed and airflow direction, which is used to adjust the wind speed and airflow path in the air duct according to the preheating scheme and real-time data.

[0012] Preferably, the oxygen injection points in S2 include but are not limited to setting a plurality of optional oxygen injection points on the air duct, and selectively opening or closing the oxygen injection points according to the preheating scheme.

[0013] Preferably, the cooling scheme in step S3 includes but is not limited to reducing the amount of liquid oxygen injected and adjusting the wind speed of the air duct.

[0014] A volatilization kiln liquid oxygen duct control system, used for a volatilization kiln liquid oxygen duct modification operation method, including a temperature sensor module, a liquid oxygen injection system, an air duct system, a central control system, an execution control module, a data acquisition and monitoring module, and a user operation interface module;

[0015] The user operation interface module is connected to the central control system and the data acquisition and monitoring module. The temperature sensor module transmits the temperature change data to the central control system for calculation through the data acquisition and monitoring module. After the central control system completes the calculation, it sends the control signal for the liquid oxygen injection system and the air duct system to the execution control module, and displays it through the user operation interface module.

[0016] Preferably, the liquid oxygen injection system includes a liquid oxygen storage tank, an oxygen injection pipeline, a multi-point oxygen injection device, and an oxygen flow control valve.

[0017] Preferably, the branch pipe system includes an air supply duct, a wind speed regulating device, and an air flow direction control device.

[0018] Preferably, the central control system includes an industrial computer, an adaptive fuzzy neural network temperature control algorithm, and a data interface.

[0019] Preferably, the calculation steps of the adaptive fuzzy neural network temperature control algorithm are:

[0020] Establish fuzzy rules: Based on fuzzy logic control rules, define temperature error e = T setpoint -T current and the fuzzy set of temperature change rate ΔT, including "high", "medium", and "low", so as to generate a control rule set according to the combination of e and ΔT;

[0021] Adaptive adjustment: Introduce an adaptive neural network model to adjust the membership function parameters of the fuzzy rules and define the adaptive weight w i , which is used to adjust the influence of each fuzzy rule on the final control output. The expression is as follows:

[0022]

[0023] Among them, α is the learning rate parameter, N is the number of fuzzy rules;

[0024] Control output: Combine fuzzy reasoning and adaptive weights to calculate oxygen injection volume ΔO2 and wind speed ΔV air Control increment:

[0025]

[0026] Update oxygen injection and wind speed:

[0027] O2=O2+ΔO2

[0028] V air =V air +ΔV air .

[0029] The present invention provides a method for modifying the liquid oxygen duct of a volatilization kiln. It has the following beneficial effects:

[0030] 1. The present invention not only reduces the energy waste caused by kiln ring formation, but also reduces the coal consumption and liquid oxygen usage by optimizing the combustion process and accurately controlling the temperature in the kiln. Combined with the real-time adjustment function of the automatic control system, the overall energy utilization rate of the system is improved, the production cost is further reduced, and the long-term stable operation of the volatilization kiln is guaranteed.

[0031] 2. The present invention can significantly reduce the formation of rings at the kiln mouth of the zinc volatilization kiln through precise temperature control and optimized oxygen distribution. Through the adaptive fuzzy neural network temperature control algorithm, the system can effectively adjust the oxygen injection amount and wind speed in the high-temperature area of ​​the kiln, so that the temperature of the kiln mouth is maintained within an appropriate range, reducing the frequency of ring formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of the steps of the operation method of the present invention;

[0033] Figure 2 It is a schematic diagram of the system framework of the present invention;

[0034] Figure 3 It is a schematic diagram of the framework of the liquid oxygen injection system of the present invention;

[0035] Figure 4It is a schematic diagram of the air duct system framework of the present invention;

[0036] Figure 5 It is a schematic diagram of the central control system framework of the present invention. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings 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.

[0038] Embodiment 1:

[0039] Please see attached Figure 1 The embodiment of the present invention provides a method for modifying a liquid oxygen duct of a volatilization kiln, comprising the following steps:

[0040] S1. Collect real-time temperature change data in the volatilization kiln through the temperature sensor arranged in the furnace body;

[0041] Specifically, temperature sensors are arranged at different key positions of the volatilization kiln. The recommended number is 10-20. The specific number and position are determined according to the length, diameter and operation requirements of the kiln. These sensors can use high temperature and corrosion resistant platinum resistance thermometers (Pt100) or thermocouples (such as K-type thermocouples) to ensure that temperature data can be accurately and stably collected in high temperature environments. The temperature data collected by the temperature sensor is transmitted to the central control system in real time through the data acquisition and monitoring module. The sampling frequency is recommended to be set to 1-2 times per second to ensure the real-time and accuracy of the data.

[0042] S2. The control system generates a preheating scheme according to the temperature data, wherein the preheating scheme includes selecting the position of the oxygen injection point, setting the liquid oxygen injection amount and the wind speed of the air duct; the air duct system includes an air valve capable of adjusting the wind speed and airflow direction, which is used to adjust the wind speed and airflow path in the air duct according to the preheating scheme and real-time data; the oxygen injection point includes but is not limited to setting a plurality of optional oxygen injection points on the air duct, and selectively opening or closing the oxygen injection point according to the preheating scheme;

[0043] Specifically, after receiving the temperature data, the central control system generates a preheating plan based on the temperature distribution and change trend. The core content of the preheating plan includes:

[0044] Oxygen injection point location selection: 5-10 optional oxygen injection points are arranged on the air duct, and these oxygen injection points are evenly distributed along the length of the air duct, with a recommended interval of 1-2 meters. The control system selects 1-3 oxygen injection points for liquid oxygen injection according to the temperature distribution in the kiln and the preheating target. Unused oxygen injection points remain closed.

[0045] Liquid oxygen injection volume setting: According to the actual conditions of different preheating stages and kiln temperature, the liquid oxygen injection volume can be adjusted dynamically. The initial injection volume is recommended to be set to 0.5-1.0 cubic meters of liquid oxygen per hour, and the subsequent adjustment range is ±10-20% per hour according to temperature changes.

[0046] Wind speed and airflow path setting: The air duct system is equipped with an air valve that can adjust the wind speed and airflow direction. The initial wind speed is recommended to be set to 5-10 m / s, and dynamically adjusted according to the temperature feedback during the preheating process. The wind speed adjustment range is ±2 m / s. At the same time, the airflow direction can be changed by adjusting the opening of the air valve to optimize the distribution of airflow in the kiln and make the preheating more uniform.

[0047] S3. Start the control system and operate the liquid oxygen injection system and the air duct system, and generate a multi-stage cooling plan according to the development trend of the preheating plan. The cooling plan includes but is not limited to reducing the liquid oxygen injection amount and adjusting the air duct wind speed.

[0048] Specifically, after the preheating stage is completed, the control system will automatically generate a cooling plan. The cooling process is designed as multiple stages, and the specific operations of each stage are as follows:

[0049] The first stage (initial cooling): the liquid oxygen injection is reduced to 50-70% of the preheating period, and the wind speed is reduced to 3-5 m / s. This stage lasts for 30-60 minutes to gradually reduce the temperature in the kiln.

[0050] The second stage (intermediate cooling): further reduce the amount of liquid oxygen injected to 20-30% of the original amount, and reduce the wind speed to 2-3 m / s. This stage lasts for 60-120 minutes to ensure a steady drop in temperature.

[0051] The third stage (final cooling): completely stop the injection of liquid oxygen, keep the wind speed at 1-2 m / s, and use natural ventilation and a small amount of forced ventilation to slowly reduce the temperature in the kiln to the target temperature. The duration of this stage is determined according to the actual temperature drop, usually 120-180 minutes.

[0052] After each cooling stage, the system will determine whether to enter the next stage based on the data from the temperature sensor. The control system displays the cooling process and current temperature status through the user interface, and the operator can fine-tune the cooling plan according to actual needs.

[0053] Through precise temperature control and optimized oxygen distribution, the formation of rings at the kiln mouth of zinc volatilization kiln can be significantly reduced. Through the adaptive fuzzy neural network temperature control algorithm, the system can effectively adjust the oxygen injection amount and wind speed in the high temperature area of ​​the kiln, so that the temperature of the kiln mouth is kept within the appropriate range and the frequency of ring formation is reduced.

[0054] Due to the effectiveness of the present invention in controlling the ring formation of zinc volatilization kilns, the frequency and difficulty of manually beating the kiln mouth ring formation are greatly reduced. The multi-point oxygen injection device combined with precise temperature management reduces production stoppages and manual intervention caused by ring formation, significantly reduces the labor intensity of workers, and improves overall work efficiency.

[0055] Embodiment 2:

[0056] Please see attached Figure 2 , an embodiment of the present invention provides a volatilization kiln liquid oxygen duct control system, including a temperature sensor module, a liquid oxygen injection system, a duct system, a central control system, an execution control module, a data acquisition and monitoring module, and a user operation interface module;

[0057] The user operation interface module is connected to the central control system and the data acquisition and monitoring module. The temperature sensor module transmits the temperature change data to the central control system for calculation through the data acquisition and monitoring module. After the central control system completes the calculation, it sends the control signal for the liquid oxygen injection system and the air duct system to the execution control module, and displays it through the user operation interface module.

[0058] Specifically, the user interface module is connected to the central control system and the data acquisition and monitoring module through wired or wireless communication. The main function of this module is to provide the operator with a human-computer interaction interface, through which the operator can input relevant parameters, view real-time data, and monitor the operating status of the system. The user interface module adopts a touch screen design and is equipped with a graphical user interface (GUI), which includes temperature distribution diagrams, real-time data curves, system operation options, etc. The operator can start or stop the system, set the target temperature for preheating and cooling, and adjust control parameters such as liquid oxygen injection volume and wind speed through this module. In addition, the user interface can also display system alarm information and operation logs, so that the operator can take timely measures.

[0059] The temperature sensor module is arranged at several key positions of the volatilization kiln to monitor the temperature changes in the kiln in real time. The module consists of multiple high-precision temperature sensors, each of which outputs temperature data in the form of digital signals and transmits the collected temperature data to the data acquisition and monitoring module through a dedicated signal transmission line or wireless communication. After receiving the temperature data, the data acquisition and monitoring module performs preliminary processing on the data, such as data filtering, outlier removal, etc., to ensure the accuracy and stability of the data. The processed temperature data is transmitted to the central control system via a high-speed data bus or network. After receiving the data, the central control system calculates and analyzes the temperature data according to the preset control algorithm to generate corresponding control instructions.

[0060] After completing the calculation and analysis of the temperature data, the central control system generates a set of control instructions, including the adjustment of the liquid oxygen injection amount, the adjustment of the wind speed, the opening and closing of the oxygen injection point, etc. The system adopts a control algorithm based on adaptive fuzzy logic. The algorithm dynamically adjusts the operating parameters of the liquid oxygen injection system and the air duct system according to the current temperature change trend and the preset temperature target. The control instructions are sent to the execution control module through the output interface of the central control system. After receiving the instructions, the execution control module controls the opening and closing of the valve of the liquid oxygen injection system through the drive circuit, adjusts the injection amount of liquid oxygen, and controls the speed of the fan in the air duct system to adjust the wind speed. The execution control module can also selectively open and close specific oxygen injection points according to the instructions to achieve fine control of the temperature in the kiln.

[0061] While the execution control module transmits the control instructions to the liquid oxygen injection system and the air duct system, the central control system transmits the calculation results, the content of the control instructions and the current temperature status information to the user operation interface module. The user operation interface module displays real-time information such as the current temperature distribution, liquid oxygen injection volume, wind speed and the working status of each oxygen injection point through the interface. In addition, the interface also displays the execution status of the control instructions, including the time of command execution, the specific content of the operation, etc., for the operator's reference. The module also has a historical data query function, and the operator can retrieve previous operation records for analysis and summary to optimize subsequent operations.

[0062] Please see attached Figure 3 The liquid oxygen injection system includes a liquid oxygen storage tank, an oxygen injection pipeline, a multi-point oxygen injection device, and an oxygen flow control valve.

[0063] Specifically, first of all, liquid oxygen storage tanks are used to safely store and supply liquid oxygen. Liquid oxygen storage tanks are usually made of double-layer stainless steel and filled with high-efficiency insulation materials to maintain the low temperature of liquid oxygen (usually below -183°C) to avoid loss caused by evaporation of liquid oxygen. The capacity of the storage tank is usually determined according to production needs. It is recommended to select a storage tank of 10 cubic meters to 50 cubic meters to ensure that the system can still stably supply liquid oxygen when running at high load. In addition, the storage tank is equipped with a safety valve, a pressure monitor and a liquid level sensor to ensure that the storage pressure and liquid level of liquid oxygen remain within a safe range to prevent system failures due to overpressure or insufficient liquid oxygen.

[0064] Secondly, the oxygen injection pipeline connects the liquid oxygen storage tank and the multi-point oxygen injection device, and is responsible for transporting liquid oxygen from the storage tank to the designated oxygen injection point. The oxygen injection pipeline is made of low-temperature resistant materials, usually stainless steel or copper, and the inner wall is specially treated to prevent frost or ice blockage in the pipeline. The pipeline layout design needs to consider the maintenance of the temperature of liquid oxygen during transportation. The outside of the pipeline is usually covered with an insulation layer to reduce the impact of external heat on the liquid oxygen in the pipe. The pressure in the pipeline is controlled by the liquid oxygen pump. The liquid oxygen pump adjusts the delivery pressure to ensure that the liquid oxygen can reach each oxygen injection point smoothly and maintain a stable flow rate during the oxygen injection process.

[0065] The multi-point oxygen injection device is an important part of the oxygen injection system. Its function is to accurately inject liquid oxygen into different positions in the kiln to achieve fine temperature control. The multi-point oxygen injection device is usually composed of multiple independently controlled nozzles or nozzles, which are evenly distributed along the air duct or kiln wall and can be opened or closed according to the instructions of the central control system. Each nozzle is equipped with an independent control valve to ensure that liquid oxygen can be accurately injected into the predetermined position, thereby optimizing local temperature regulation. The design of the oxygen injection device must ensure the adjustability of the injection angle and flow rate to adapt to different production stages and temperature requirements. Through the flexible control of the multi-point oxygen injection device, the best oxygen distribution can be formed in the kiln, the combustion efficiency and temperature uniformity can be improved, and the overall production quality and efficiency can be improved.

[0066] The oxygen flow control valve is a key component to ensure the stable operation of the liquid oxygen injection system. It is responsible for accurately controlling the injection volume of liquid oxygen. The flow control valve is installed at the end of each oxygen injection pipeline and is directly connected to the multi-point oxygen injection device. It can automatically adjust the opening according to the instructions of the central control system to control the amount of liquid oxygen passing through. The control valve is usually driven electrically or pneumatically, with high precision and fast response capabilities, and can quickly adjust the flow rate according to the real-time data feedback from the temperature sensor. By accurately controlling the liquid oxygen flow rate, the temperature can be quickly adjusted and maintained stably, avoiding the problem of excessive temperature due to excessive injection or insufficient temperature due to insufficient injection, thereby ensuring the stable operation of the volatilization kiln and the consistency of product quality.

[0067] In general, the liquid oxygen injection system achieves efficient use of liquid oxygen in the volatilization kiln through safe storage in liquid oxygen storage tanks, effective transportation in oxygen injection pipelines, precise injection by multi-point oxygen injection devices, and precise adjustment of oxygen flow control valves.

[0068] Please see attached Figure 4 The air duct system includes an air supply duct, a wind speed regulating device, and an air flow direction control device.

[0069] Specifically, first of all, the air supply duct is the core part of the duct system, which is used to transport air from the outside to various oxygen injection points and combustion areas of the volatilization kiln. The air supply duct is usually made of high temperature resistant and corrosion resistant materials, such as galvanized steel pipes, stainless steel pipes or high temperature resistant alloy steel pipes, to ensure long-term stable operation in high temperature and dusty environments. The inner diameter and wall thickness of the pipe are designed according to the air flow requirements and the length of the pipe. The common pipe diameter is between 300 mm and 800 mm, and the specific specifications are adjusted according to the size of the kiln and the process requirements. The outside of the air supply duct is usually covered with an insulation layer to reduce heat loss and maintain the stability of the air flow temperature in the pipe. In addition, the pipeline system is also equipped with a pressure monitoring device and a pressure regulating valve to ensure the stability of the air pressure in the pipe and prevent air flow instability or backflow caused by air pressure fluctuations.

[0070] Secondly, the wind speed regulating device is installed at the key nodes of the air supply duct. Its main function is to adjust the air flow rate in the duct according to the instructions of the central control system. The wind speed regulating device usually adopts the form of electric damper or variable frequency fan, and controls the air flow rate in the air supply duct by adjusting the fan speed or damper opening. The initial wind speed is recommended to be set within the range of 5 to 15 m / s, and the actual wind speed adjustment is dynamically adjusted according to real-time temperature feedback. The wind speed regulating device can accurately control the speed of the air flow, ensure the stability of the air supply in the kiln, and prevent the temperature from rising suddenly due to excessive airflow, or inadequate combustion due to excessively slow airflow. This device can also automatically adjust the wind speed according to different production stages (such as preheating, steady burning, and cooling) to meet the different requirements for airflow in each stage, thereby achieving more accurate temperature control.

[0071] The airflow direction control device is another key component of the air duct system. It is mainly used to adjust the distribution direction of the airflow in the kiln to ensure that the airflow can effectively cover all combustion areas. The airflow direction control device usually takes the form of an adjustable guide plate or a rotary damper, which is installed at the branch pipe of the air supply duct or the entrance of the oxygen injection point. By controlling the angle of the guide plate or the direction of the rotary damper, the airflow can be directed to different areas in the kiln to optimize the airflow path in the kiln. For different production processes or combustion requirements, the airflow direction control device can adjust the angle and position of the airflow entering the kiln to avoid uneven airflow distribution or local overheating. In addition, the device can also be linked with the temperature sensor and the wind speed adjustment device to automatically adjust the airflow direction according to the real-time temperature and wind speed data to achieve the best combustion and temperature control effect.

[0072] Please see attached Figure 5 The central control system includes an industrial computer, an adaptive fuzzy neural network temperature control algorithm, and a data interface. The calculation steps of the adaptive fuzzy neural network temperature control algorithm are:

[0073] Establish fuzzy rules: Based on fuzzy logic control rules, define temperature error e = T setpoint -T current and the fuzzy set of temperature change rate ΔT, including "high", "medium", and "low", so as to generate a control rule set according to the combination of e and ΔT;

[0074] Adaptive adjustment: Introduce an adaptive neural network model to adjust the membership function parameters of the fuzzy rules and define the adaptive weight w i , which is used to adjust the influence of each fuzzy rule on the final control output. The expression is as follows:

[0075]

[0076] Among them, α is the learning rate parameter, N is the number of fuzzy rules;

[0077] Control output: Combine fuzzy reasoning and adaptive weights to calculate oxygen injection volume ΔO2 and wind speed ΔV air Control increment:

[0078]

[0079] Update oxygen injection and wind speed:

[0080] O2=O2+ΔO2

[0081] V air =V air +ΔV air .

[0082] Specifically, the industrial computer is the hardware foundation of the central control system, responsible for processing data from the temperature sensor module, executing the control algorithm and issuing control instructions. The computer uses a high-performance industrial-grade CPU with multi-tasking capabilities, and can maintain stable operation in complex operating environments. It integrates an adaptive fuzzy neural network temperature control algorithm and is connected to each module in the system through a high-speed data interface to ensure fast transmission and processing of real-time data.

[0083] The data interface connects the central control system with other system modules, including the temperature sensor module, execution control module, user interface module, etc. Through the high-speed data interface, the central control system can obtain temperature data in real time, execute the control algorithm, and quickly transmit the calculation results to the execution control module. The design of the interface ensures low latency and high reliability of data transmission, so that the entire system can respond quickly to temperature changes and achieve precise temperature control.

[0084] Overall, the central control system can achieve precise regulation of the temperature inside the volatilization kiln through the collaborative work of industrial computers, adaptive fuzzy neural network temperature control algorithms and data interfaces, ensuring the stability of system operation and the efficiency of the production process.

[0085] 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 modifying the liquid oxygen duct of a volatilization kiln, characterized in that: The following steps are involved: S1. Collect real-time temperature change data in the volatilization kiln through the temperature sensor arranged in the furnace body; S2. The control system generates a preheating scheme according to the temperature data, wherein the preheating scheme includes selecting the position of the oxygen injection point, setting the liquid oxygen injection amount and the wind speed of the air duct; S3. Start the control system and operate the liquid oxygen injection system and the air duct system, and generate a multi-stage cooling plan according to the development trend of the preheating plan.

2. The method for modifying the liquid oxygen duct of a volatilization kiln according to claim 1 is characterized in that: The air duct system includes an air valve capable of adjusting air speed and air flow direction, which is used to adjust the air speed and air flow path in the air duct according to the preheating plan and real-time data.

3. The method for modifying the liquid oxygen duct of a volatilization kiln according to claim 1, characterized in that: The oxygen injection points in S2 include but are not limited to setting a plurality of optional oxygen injection points on the air duct, and selectively opening or closing the oxygen injection points according to the preheating scheme.

4. The method for modifying the liquid oxygen duct of a volatilization kiln according to claim 1 is characterized in that: The cooling scheme in step S3 includes but is not limited to reducing the amount of liquid oxygen injected and adjusting the wind speed of the air duct.

5. A volatilization kiln liquid oxygen duct control system, used in a volatilization kiln liquid oxygen duct modification operation method according to any one of claims 1 to 4, characterized in that: It includes temperature sensor module, liquid oxygen injection system, air duct system, central control system, execution control module, data acquisition and monitoring module, and user operation interface module; The user operation interface module is connected to the central control system and the data acquisition and monitoring module. The temperature sensor module transmits the temperature change data to the central control system for calculation through the data acquisition and monitoring module. After the central control system completes the calculation, it sends the control signal for the liquid oxygen injection system and the air duct system to the execution control module, and displays it through the user operation interface module.

6. A volatilization kiln liquid oxygen duct control system according to claim 5, characterized in that: The liquid oxygen injection system comprises a liquid oxygen storage tank, an oxygen injection pipeline, a multi-point oxygen injection device, and an oxygen flow control valve.

7. A volatilization kiln liquid oxygen duct control system according to claim 5, characterized in that: The air duct system includes an air supply duct, a wind speed regulating device, and an air flow direction controlling device.

8. A volatilization kiln liquid oxygen duct control system according to claim 5, characterized in that: The central control system includes an industrial computer, an adaptive fuzzy neural network temperature control algorithm, and a data interface.

9. A volatilization kiln liquid oxygen duct control system according to claim 8, characterized in that: The calculation steps of the adaptive fuzzy neural network temperature control algorithm are: Establish fuzzy rules: Based on fuzzy logic control rules, define temperature error e = T setpoint -T current and the fuzzy set of temperature change rate ΔT, including "high", "medium", and "low", so as to generate a control rule set according to the combination of e and ΔT; Adaptive adjustment: Introduce an adaptive neural network model to adjust the membership function parameters of the fuzzy rules and define the adaptive weight w i , which is used to adjust the influence of each fuzzy rule on the final control output. The expression is as follows: Among them, α is the learning rate parameter, N is the number of fuzzy rules; Control output: Combine fuzzy reasoning and adaptive weights to calculate oxygen injection volume ΔO2 and wind speed ΔV air Control increment: Update oxygen injection and wind speed: O2=O2+ΔO2 V air =V air +ΔV air 。

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