Melting furnace temperature dynamic control system and method

Abstract

The present invention discloses a dynamic control system and method for the temperature of a smelting furnace. The smelting furnace is heated by fuel combustion and includes a furnace, at least two regeneration beds and burners corresponding to the regeneration beds. The control system includes a furnace temperature sensor, a regeneration bed temperature sensor and a controller. The controller calculates the temperature of the furnace gas and the temperature of the regeneration bed obtained by the furnace temperature sensor and the regeneration bed temperature sensor to control the burner to switch the combustion, and when the burner is burning, controls the opening of the fuel valve corresponding to the burner, the speed of the combustion-supporting fan and the exhaust fan. The present invention controls the fuel combustion and the burner in the smelting furnace during the metal smelting process, so as to accurately control the combustion mode of the burner and make the furnace temperature control more accurate and balanced, thereby achieving the effect of reducing burnout and improving alloy quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of control systems for industrial equipment, and in particular to a system and method for dynamically controlling a smelting furnace using a computer and a programmable controller. The present invention is particularly suitable for a regenerative aluminum smelting furnace fueled by gas or oil. Background Art

[0002] Control systems are engineering devices or mechanisms that manage, direct, and regulate other variables in a dynamic manner to achieve a desired outcome. They are used in a wide range of applications, from simple home thermostats to complex industrial automation systems. For closed-loop control systems of industrial equipment, the controller's actions depend on feedback signals from the process.

[0003] As the "brain" of modern industrial production, industrial control systems are undergoing unprecedented intelligent transformation. With the continuous development of technologies such as the Internet of Things, big data, and artificial intelligence, traditional industrial control systems are moving towards intelligence, networking, and automation. This evolution process not only improves production efficiency and reduces operating costs, but also brings unprecedented innovation opportunities to industrial manufacturing. The emergence of intelligent industrial control systems makes factory production processes more transparent and controllable. Through real-time data collection and analysis, managers can accurately grasp the operating status of the production line and promptly discover and solve potential problems. At the same time, intelligent systems can also optimize production processes, improve equipment utilization and maintenance efficiency, thereby further enhancing the competitiveness of enterprises.

[0004] Figure 1 A schematic diagram showing a conventional aluminum melting torch furnace and its control method is shown. Figure 1 As shown, the aluminum alloy production process includes the smelting process of aluminum raw materials (such as aluminum ingots). The gas-fired regenerative smelting furnace includes a furnace, and a plurality of burners are arranged in the furnace. The burners are generally arranged in pairs, but multiple burners (such as three burners) may also be arranged in an unpaired manner. When the smelting furnace is heated, it is usually set so that one of the burners burns, the other burners are in the air intake state, and the regeneration bed is in the preheating state. In addition, the closed-loop control formed by PLC and various temperature and state sensors, as well as fuel, air, exhaust gas and other valves is used to monitor and control the furnace status, and is displayed through the terminal device.

[0005] Figure 2The parameter setting interface of a monitoring terminal of a control system of a traditional aluminum smelting furnace is shown. The interface is used to monitor the state of the smelting furnace and set the control parameters of the smelting furnace. The smelting furnace is a gas-fired regenerative smelting furnace with three burners (also called main guns), namely burner 1#, burner 2# and burner 3#. Each burner sprays air and fuel into the furnace when burning, and discharges exhaust gas when not burning. The interface can set the size of the combustion-supporting fan valve, fuel valve and smoke exhaust fan valve of each burner at "high fire setting" and "low fire setting", and can also set the burner re-combustion time. In addition. In order to control the furnace temperature, the interface can also set the furnace temperature, the temperature of each regeneration bed, the low fire temperature of the main gun (the temperature when the nozzle changes from high fire to low fire), the main gun temperature control floating, etc.

[0006] During the temperature control process, when the furnace temperature reaches the set temperature, the burner stops firing to maintain a constant temperature. When the furnace temperature is lower than the set control temperature, the burner automatically turns on the flame to heat up again. In order to avoid the frequent automatic start of the burner, there is a furnace temperature floating parameter item in the parameter interface (for example, set to 50 degrees).

[0007] However, the above control system can only set two predetermined combustion modes, such as "high fire setting" and "low fire setting" ("high fire setting" means that the furnace needs to heat up quickly and melt solid materials for the purpose, and this flame can be adjusted to a fierce high-temperature flame to achieve the purpose of rapid heating, increasing the speed of melting solid materials and rapid bottom penetration; "low fire setting" is mainly used for keeping the aluminum liquid in the furnace warm and waiting for incoming materials, and using a small flame to slowly heat up and keep warm during the alloy adjustment process). Therefore, the existing technology cannot perform more precise temperature control on the furnace and hearth of the smelting furnace, resulting in increased metal oxidation and burning, or a decrease in alloy quality due to absorption of excessive gas and other reasons. Summary of the invention

[0008] 1. Technical issues to be resolved

[0009] The present invention aims to solve the problem that the existing gas-fired regenerative smelting furnace cannot realize accurate furnace temperature control, resulting in increased oxidation and burning of molten metal, or reduced alloy quality due to absorption of excessive gas.

[0010] (II) Technical solution

[0011] In order to solve the above technical problems, the present invention proposes a dynamic control system for the temperature of a smelting furnace on one hand. The smelting furnace is heated by fuel combustion, and includes a furnace, at least two regeneration beds and burners corresponding to the regeneration beds. The control system includes: a furnace temperature sensor for detecting the temperature of the furnace gas; a regeneration bed temperature sensor for detecting the temperature of the regeneration bed; fuel pipes, combustion-supporting air pipes and exhaust pipes corresponding to each burner, and a fuel valve for controlling the flow of the fuel pipe, a combustion-supporting fan for providing combustion-supporting air and an exhaust fan for exhausting gas; a controller for controlling the burners to switch combustion, so that when the temperature difference between the regeneration bed corresponding to the currently burning burner and the regeneration bed with the lowest temperature is greater than a predetermined value, the burner corresponding to the regeneration bed with the lowest temperature is switched to burn, and other burners do not burn; and, when the burner is burning, the opening of the fuel valve corresponding to the burner and the speed of the combustion-supporting fan and the exhaust fan are controlled.

[0012] According to a preferred embodiment of the present invention, the controller includes a burner switching module, which is used to control the burner to perform combustion switching, so that when the temperature difference between the regeneration bed corresponding to the currently burning burner and the regeneration bed with the lowest temperature is greater than a predetermined value, the burner corresponding to the regeneration bed with the lowest temperature is switched to burn, and other burners do not burn.

[0013] According to a preferred embodiment of the present invention, when the burner switching module controls the burner to perform combustion switching, if the temperature difference between the regeneration bed corresponding to the currently burning burner and the regeneration bed with the lowest temperature is greater than a predetermined value and the time interval from the last switching is greater than a predetermined value, the burner corresponding to the regeneration bed with the lowest temperature is switched to burn, and other burners do not burn.

[0014] According to a preferred embodiment of the present invention, the controller includes a fuel valve opening calculation module, a combustion fan speed calculation module and an exhaust fan speed calculation module, which are respectively used to calculate the opening of the fuel valve, the speed of the combustion fan and the exhaust fan corresponding to the currently burning burner according to the temperatures obtained by the furnace temperature sensor and the regeneration bed temperature sensor.

[0015] According to a preferred embodiment of the present invention, the controller includes a storage module, the storage module stores a standard table, the standard table records the optimal fuel flow rate, combustion air flow rate and exhaust flow rate corresponding to the current furnace temperature and the target furnace temperature;

[0016] The fuel valve opening calculation module, the combustion-supporting fan speed calculation module and the exhaust fan speed calculation module read the standard table respectively, and calculate the optimal fuel valve opening, combustion-supporting fan and exhaust fan speeds corresponding to the currently burning burner according to the standard table.

[0017] According to a preferred embodiment of the present invention, the standard table includes an efficiency standard table and an energy-saving standard table, which are calibrated based on the best smelting efficiency and the best energy-saving as standards respectively.

[0018] According to a preferred embodiment of the present invention, the control system includes a user control module, which is used to receive user input so as to control the standard table based on which the fuel valve opening calculation module, the combustion fan speed calculation module and the exhaust fan speed calculation module are based, so as to decide whether to perform furnace temperature control in efficiency priority mode or energy saving priority mode.

[0019] On the other hand, the present invention proposes a method for dynamically controlling the furnace temperature of a smelting furnace. The smelting furnace is heated by fuel combustion and includes a furnace, at least two regeneration beds and burners corresponding to the regeneration beds. The control method includes: detecting the temperature of the furnace gas and the temperature of the regeneration bed; calculating according to the temperature of the furnace gas and the temperature of the regeneration bed to control the burner to switch combustion, so that when the temperature difference between the regeneration bed corresponding to the currently burning burner and the regeneration bed with the lowest temperature is greater than a predetermined value, the burner corresponding to the regeneration bed with the lowest temperature is switched to burn, and other burners do not burn; when the burner is burning, controlling the opening of the fuel valve corresponding to the burner, and the speed of the combustion-supporting fan and the exhaust fan.

[0020] According to a preferred embodiment of the present invention, the method also includes: establishing and storing a standard table, wherein the standard table records the optimal fuel flow, combustion air flow and exhaust flow corresponding to the current furnace temperature and the target furnace temperature; reading the standard table, and calculating the opening of the optimal fuel valve, the rotation speed of the combustion air fan and the exhaust air fan corresponding to the currently burning burner according to the standard table.

[0021] According to a preferred embodiment of the present invention, the standard table includes an efficiency standard table and an energy-saving standard table, which are calibrated based on the best smelting efficiency and the best energy-saving as standards respectively.

[0022] According to a preferred embodiment of the present invention, the method further comprises: receiving user input to determine whether the standard table is an efficiency standard table or an energy-saving standard table to decide whether to perform furnace temperature control in an efficiency priority mode or an energy-saving priority mode.

[0023] (III) Beneficial effects

[0024] The present invention can accurately control the combustion mode of the burner so as to make the furnace temperature control more accurate and balanced, thereby achieving the effect of reducing burning loss and improving alloy quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a conventional aluminum melting torch furnace and its control method.

[0026] Figure 2 The figure shows a parameter setting interface of a monitoring terminal of a control system of a conventional aluminum smelting furnace, which is used to monitor the state of the smelting furnace and set the control parameters of the smelting furnace.

[0027] Figure 3 It is a structural schematic diagram of the dynamic control system of the furnace temperature of a smelting furnace of the present invention.

[0028] Figure 4 It is a schematic diagram of an embodiment of a display interface of a monitoring terminal of a smelting furnace temperature dynamic control system of the present invention.

[0029] Figure 5 It is a schematic diagram of input and output signal terminals of an embodiment of a controller of a smelting furnace temperature dynamic control system of the present invention.

[0030] Figure 6 It is a functional module schematic diagram of a controller of a smelting furnace temperature dynamic control system of the present invention.

[0031] Figure 7 It is a flow chart of the method for dynamically controlling the temperature of a smelting furnace of the present invention. DETAILED DESCRIPTION

[0032] In order to solve the above technical problems, the present invention proposes a dynamic control system for the temperature of a smelting furnace. The smelting furnace of the present invention generally refers to a flame furnace, that is, the smelting furnace is heated by burning fuel. The present invention is not limited to the type of fuel used, and oil, gas, coal gas, etc. are all possible. In addition, although the present invention is not limited to the type of smelting furnace, the present invention is more preferably a more energy-saving regenerative smelting furnace.

[0033] Although the present invention is described with reference to a specific embodiment of an aluminum smelting furnace, the present invention can also be applied to smelting furnaces of other non-ferrous metals or other types of smelting furnaces having similar combustion control.

[0034] The present invention is not limited to the type of smelting furnace, so the structure of the smelting furnace to which it is applicable may be different, but it should at least include a furnace for containing molten metal and serving as a combustion chamber, and at least two regeneration beds and burners corresponding to the regeneration beds. As mentioned above, the burners usually appear in pairs, but other numbers are also possible. The present invention is not limited to the number of burners, but excludes the case where there is only one burner.

[0035] In the smelting process, the present invention is described by taking one of the burners as an example for combustion. However, the present invention can actually be extended to the case where multiple burners are burning. As long as there are other burners that are not burning but used for exhaust, the present invention can also be applied in principle, although the present invention is not inclined to this.

[0036] The smelting furnace of the present invention comprises a fuel pipe, a combustion-supporting air pipe and an exhaust pipe corresponding to each burner, a fuel valve for controlling the flow of the fuel pipe, a combustion-supporting fan for providing combustion-supporting air and an exhaust fan for exhausting. The combustion-supporting fan for providing combustion-supporting air and the exhaust fan for exhausting can be shared by multiple burners, or different burners can be equipped with independent combustion-supporting fans and exhaust fans. The present invention is not limited to the number and connection method of the combustion-supporting fans and exhaust fans.

[0037] In addition, the smelting furnace of the present invention also has an ignition mechanism and a corresponding ignition control system, as well as a safety alarm sensor device, etc., but they are not closely related to the innovative points of the present invention, so they are not described in detail here.

[0038] It should be emphasized that the control system of the present invention at least includes a furnace temperature sensor, a regeneration bed temperature sensor and a controller. The furnace temperature sensor is used to detect the temperature of the furnace gas, and the regeneration bed temperature sensor is used to detect the temperature of the regeneration bed. The controller of the present invention calculates the temperature of the furnace gas and the temperature of the regeneration bed obtained by the furnace temperature sensor and the regeneration bed temperature sensor. On the one hand, it controls the burner to switch the combustion, and on the other hand, when the burner is burning, it controls the opening of the fuel valve corresponding to the burner, the speed of the combustion-supporting fan and the exhaust fan.

[0039] The traditional control system switches the burner combustion in a timed manner. Figure 2 As shown, the burner switching time can be set in the operation interface. However, this timed switching may cause uneven temperatures of each regeneration bed. For this reason, the present invention proposes, as a preferred embodiment, that when the temperature difference between the temperature of the regeneration bed corresponding to the currently burning burner and the temperature of the regeneration bed with the lowest temperature is greater than a predetermined value, the burner corresponding to the regeneration bed with the lowest temperature is switched to burn, and other burners are not burned. In this way, it can be ensured that the temperature deviation of the regeneration beds corresponding to each burner is not too large. In order to avoid the possibility of too frequent switching of the burner, the present invention preferably sets the predetermined value of the temperature difference not to be too large, and provides a method for users to make a setting based on experience. Alternatively, as another preferred embodiment, the time interval for burner switching can be limited to be greater than a predetermined time interval, such as 15s.

[0040] According to the present invention, in order to perform accurate combustion control, the present invention stores a standard table in the controller, and records the optimal fuel flow, combustion air flow and exhaust flow corresponding to the current furnace temperature and the target furnace temperature in the standard table, so that the fuel valve opening calculation module, the combustion fan speed calculation module and the exhaust fan speed calculation module read the standard table respectively, and calculate the opening of the optimal fuel valve, the speed of the combustion fan and the exhaust fan corresponding to the burner currently burning according to the standard table. The standard table can be determined on the basis of summarizing historical data, or it can be obtained by the manufacturer through calibration experiments before leaving the factory. Due to the existence of the standard table, the controller can quickly obtain the optimal fuel flow, combustion air flow and exhaust flow that should be controlled at present and perform corresponding control.

[0041] As a more preferred embodiment, the standard table includes an efficiency standard table and an energy-saving standard table, which are calibrated according to the best smelting efficiency and the best energy-saving standard, respectively. Depending on the products produced by smelting, there may be different requirements for different batches of products. Some may need to be produced at the highest efficiency, while others may be for the needs of energy conservation and emission reduction. For this reason, the present invention can store multiple standard tables that meet different needs in the memory, and the user can select them according to the needs of the actual situation. That is to say. The control system preferably also includes a user control module, which is used to receive user input to control the standard table based on the fuel valve opening calculation module, the combustion fan speed calculation module and the exhaust fan speed calculation module to determine whether to control the furnace temperature in the efficiency priority mode or the energy-saving priority mode.

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0043] Figure 3 FIG. 1 is a schematic diagram of the structure of the dynamic control system of the smelting furnace temperature of the present invention. Figure 3 As shown, a controller 2 is electrically connected to the smelting furnace 1, which can exchange signals with the electrical components in the smelting furnace 1. On the one hand, it receives the temperature signal from the smelting furnace, and on the other hand, it transmits the combustion control signal and the burner switching signal to the smelting furnace. Here, the temperature signal includes the temperature signal of the furnace gas and the temperature signal of the regeneration bed, which are detected by the furnace temperature sensor and the regeneration bed temperature sensor respectively.

[0044] The smelting furnace is heated by fuel combustion, and includes a furnace, at least two regeneration beds and burners corresponding to the regeneration beds, each burner is equipped with a fuel pipe and a combustion-supporting air duct, and the smelting furnace itself is equipped with an exhaust pipe. The fuel pipe is equipped with a fuel valve for controlling the flow of the fuel pipe, the combustion-supporting air duct is connected to a combustion-supporting fan for providing air, and the exhaust pipe is connected to an exhaust fan for exhausting air.

[0045] The combustion control signal generated by the controller is a signal calculated based on the furnace gas temperature and the regeneration bed temperature obtained by the furnace temperature sensor and the regeneration bed temperature sensor, and is used to control the opening of the fuel valve corresponding to the burner, the speed of the combustion-supporting fan and the exhaust fan. The burner switching signal generated by the controller is a signal to switch to which burner for combustion, which is calculated based on the temperature of the regeneration bed. When one of the burners is burning, the other burners are not burning and exhaust is performed.

[0046] See also Figure 3 The controller is also connected to a monitoring terminal 3, and the controller transmits the received temperature signal to the monitoring terminal 3 for display.

[0047] Figure 4 A schematic diagram showing an embodiment of a display interface of a monitoring terminal of a smelting furnace temperature dynamic control system of the present invention. Figure 4 As shown, Figure 2 The parameter setting interface of the monitoring terminal of the prior art shown is different. There is no option for setting combustion parameters in the display interface. Instead, there is a selection of combustion modes, namely "efficiency", "energy saving" and "custom". They represent the production mode with the highest smelting efficiency, the production mode of energy saving and emission reduction, and the customized production mode.

[0048] Unlike the traditional control system that displays the set value and current value of the fuel valve opening, the rotation speed of the combustion-supporting fan and the exhaust fan, the monitoring terminal of the present invention also displays the real-time dynamic value of the fuel valve opening, the rotation speed of the combustion-supporting fan and the exhaust fan. In other words, the fuel valve opening, the rotation speed of the combustion-supporting fan and the exhaust fan of the present invention are dynamically changed, instead of only being able to work under two settings of high fire and low fire like the traditional technology.

[0049] In addition, the display interface of the monitoring terminal of the present invention also displays the dynamic change values ​​of the furnace temperature and the temperature of each regeneration bed, so that the user can monitor the temperature change in the furnace in real time. This embodiment shows the situation of a smelting furnace with three burners.

[0050] Figure 5 Schematic diagram of input and output signal terminals of an embodiment of the controller of the smelting furnace temperature dynamic control system of the present invention. The controller of the present invention can be implemented by various processors with data processing functions, not limited to PLC, MCU, etc. Figure 5As shown, the input end of the controller includes at least four terminals, namely, furnace temperature, 1# bed temperature, 2# bed temperature and 3# bed temperature, which represent the gas temperature in the furnace and the temperature of the three regeneration beds respectively. The output of the controller includes 8 signals, namely, 1# burner fuel valve opening, 1# burner combustion-supporting fan speed, 2# burner fuel valve opening, 2# burner combustion-supporting fan speed, 3# burner fuel valve opening, 3# burner combustion-supporting fan speed, exhaust fan speed and burner switching. It can be seen that although the controller obtains the same value when calculating the fuel valve opening, it is also divided into multiple outputs to facilitate the subsequent signal processing process not to be too complicated. Similarly, the situation of the combustion-supporting fan speed is the same. Since the exhaust fan is shared, only one signal is required.

[0051] Figure 6 Schematic diagram of the functional modules of the controller of the smelting furnace temperature dynamic control system of the present invention. Figure 6 As shown, the controller of this embodiment includes a burner switching module, a calculation module, a storage module and a user input module, wherein the calculation module includes a fuel valve opening calculation module, a combustion fan speed calculation module, an exhaust fan speed calculation module, a storage module and a user input module.

[0052] As mentioned above, the burner switching module is used to calculate according to the temperature obtained by the furnace temperature sensor and the regeneration bed temperature sensor to control the burner to switch combustion. One way is that when the temperature difference between the temperature of the regeneration bed corresponding to the currently burning burner and the temperature of the regeneration bed with the lowest temperature is greater than a predetermined value, the burner corresponding to the regeneration bed with the lowest temperature is switched to burn, and other burners do not burn. Alternatively, if the temperature difference between the temperature of the regeneration bed corresponding to the currently burning burner and the temperature of the regeneration bed with the lowest temperature is greater than a predetermined value and the time interval from the last switch is greater than a predetermined value, the burner corresponding to the regeneration bed with the lowest temperature is switched to burn, and other burners do not burn.

[0053] The fuel valve opening calculation module, combustion-supporting air fan speed calculation module and exhaust fan speed calculation module as calculation modules are used to calculate the opening of the fuel valve, the speed of the combustion-supporting air fan and the exhaust fan corresponding to the currently burning burner according to the temperatures obtained by the furnace temperature sensor and the regeneration bed temperature sensor. The storage module stores a standard table, which records the optimal fuel flow, combustion-supporting air flow and exhaust flow corresponding to the current furnace temperature and the target furnace temperature. Therefore, the fuel valve opening calculation module, the combustion-supporting air fan speed calculation module and the exhaust fan speed calculation module read the standard table respectively, and calculate the optimal fuel valve opening, the speed of the combustion-supporting air fan and the exhaust fan corresponding to the currently burning burner according to the standard table.

[0054] The user control module is used to receive user input so as to control the standard table based on which the fuel valve opening calculation module, the combustion fan speed calculation module and the exhaust fan speed calculation module are based. The standard table may include an efficiency standard table, an energy-saving standard table or a custom standard table, which is calibrated according to the best smelting efficiency and the best energy-saving standards to determine whether to perform furnace temperature control in efficiency priority mode or energy-saving priority mode, or to perform furnace temperature control according to custom standards.

[0055] The signal values ​​obtained by the calculation module can be summarized and sent through different ports to control the combustion modes of the three burners respectively.

[0056] Figure 7 The flowchart of the method for dynamically controlling the temperature of a smelting furnace of the present invention is shown. Corresponding to the dynamic control system for the temperature of a smelting furnace of the present invention, the control method includes:

[0057] S1. Detecting the temperature of the furnace gas and the temperature of the regeneration bed.

[0058] The smelting furnace is heated by fuel combustion and comprises a furnace, at least two regeneration beds and burners corresponding to the regeneration beds.

[0059] S2. Calculate according to the temperature of the furnace gas and the temperature of the regeneration bed to control the burner to perform combustion switching.

[0060] This step preferably switches to the burner corresponding to the regeneration bed with the lowest temperature for combustion when the temperature difference between the temperature of the regeneration bed corresponding to the currently burning burner and the temperature of the regeneration bed with the lowest temperature is greater than a predetermined value, and the other burners do not burn.

[0061] S3. When the burner is burning, the opening of the fuel valve corresponding to the burner, and the rotation speeds of the combustion-supporting fan and the exhaust fan are controlled.

[0062] This step preferably involves establishing and storing a standard table, which records the optimal fuel flow, combustion air flow and exhaust flow corresponding to the current furnace temperature and the target furnace temperature. Thus, the standard table can be read and the optimal fuel valve opening, combustion air fan and exhaust fan speed corresponding to the currently burning burner can be calculated based on the standard table.

[0063] As a preferred embodiment, the standard table includes an efficiency standard table and an energy-saving standard table, which are calibrated according to the best smelting efficiency and the best energy-saving standards, respectively. Therefore, the method of the present invention can receive user input to determine whether the standard table based on the fuel valve opening calculation module, the combustion fan speed calculation module and the exhaust fan speed calculation module is an efficiency standard table or an energy-saving standard table, so as to decide whether to perform furnace temperature control in efficiency priority mode or energy-saving priority mode.

[0064] The control method of the present invention can also accept a user-defined standard table, so that the user can dynamically control the furnace temperature in a customized manner.

[0065] It should be noted that the above steps S2 and S3 do not need to be executed in a fixed order, and can be executed one after the other or simultaneously.

[0066] It can be seen from the above embodiments that the present invention solves the problem that the existing gas-fired regenerative smelting furnace cannot achieve accurate control of the furnace temperature, resulting in increased oxidation and burning of the molten metal, or the quality of the alloy is reduced due to reasons such as absorption of excessive gas, and can accurately control the combustion mode of the burner to make the furnace temperature control more accurate and balanced, thereby achieving the effect of reducing burning and improving alloy quality.

[0067] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A smelting furnace temperature dynamic control system, wherein the smelting furnace is heated by fuel combustion, comprises a furnace, at least two regeneration beds and burners corresponding to the regeneration beds, characterized in that: The control system comprises: A furnace temperature sensor, used to detect the temperature of the furnace gas; A regeneration bed temperature sensor is used to detect the temperature of the regeneration bed; Fuel pipes, combustion-supporting air pipes and exhaust pipes corresponding to each burner, as well as fuel valves for controlling the flow of the fuel pipes, combustion-supporting fans for providing combustion-supporting air and exhaust fans for exhausting air; The controller is used to control the burner to switch the combustion, so that when the temperature difference between the regeneration bed corresponding to the currently burning burner and the regeneration bed with the lowest temperature is greater than a predetermined value, the burner corresponding to the regeneration bed with the lowest temperature is switched to burn, and other burners do not burn; and when the burner is burning, the opening of the fuel valve corresponding to the burner, the speed of the combustion-supporting fan and the exhaust fan are controlled.

2. The smelting furnace temperature dynamic control system according to claim 1, characterized in that: The controller includes a burner switching module, which is used to control the burner to perform combustion switching, so that when the temperature difference between the regeneration bed corresponding to the currently burning burner and the regeneration bed with the lowest temperature is greater than a predetermined value, the burner corresponding to the regeneration bed with the lowest temperature is switched to burn, and other burners do not burn.

3. The smelting furnace temperature dynamic control system according to claim 2, characterized in that: When the burner switching module controls the burner to switch combustion, if the temperature difference between the regeneration bed corresponding to the currently burning burner and the regeneration bed with the lowest temperature is greater than a predetermined value and the time interval from the last switching is greater than a predetermined value, the burner corresponding to the regeneration bed with the lowest temperature is switched to burn, and other burners are not burned.

4. The smelting furnace temperature dynamic control system according to claim 1, characterized in that: The controller includes a fuel valve opening calculation module, a combustion-supporting fan speed calculation module and an exhaust fan speed calculation module, which are respectively used to calculate the opening of the fuel valve, the speed of the combustion-supporting fan and the exhaust fan corresponding to the currently burning burner according to the temperatures obtained by the furnace temperature sensor and the regeneration bed temperature sensor.

5. The smelting furnace temperature dynamic control system according to claim 4, characterized in that: The controller includes a storage module, which stores a standard table, which records the optimal fuel flow rate, combustion air flow rate and exhaust flow rate corresponding to the current furnace temperature and the target furnace temperature; The fuel valve opening calculation module, the combustion-supporting fan speed calculation module and the exhaust fan speed calculation module read the standard table respectively, and calculate the optimal fuel valve opening, combustion-supporting fan and exhaust fan speeds corresponding to the currently burning burner according to the standard table.

6. The smelting furnace temperature dynamic control system according to claim 5, characterized in that: The standard table includes an efficiency standard table and an energy-saving standard table, which are calibrated based on the best smelting efficiency and the best energy-saving as standards respectively.

7. The smelting furnace temperature dynamic control system according to claim 5, characterized in that: The control system includes a user control module, which is used to receive user input so as to control the standard table based on which the fuel valve opening calculation module, the combustion fan speed calculation module and the exhaust fan speed calculation module are based, so as to decide whether to perform furnace temperature control in efficiency priority mode or energy saving priority mode.

8. A method for dynamically controlling the temperature of a smelting furnace, wherein the smelting furnace is heated by fuel combustion and comprises a furnace, at least two regeneration beds and burners corresponding to the regeneration beds, characterized in that: The control method comprises: detecting the temperature of the furnace gas and the temperature of the regeneration bed; Calculating according to the temperature of the furnace gas and the temperature of the regeneration bed to control the burner to switch combustion, so that when the temperature difference between the regeneration bed corresponding to the currently burning burner and the regeneration bed with the lowest temperature is greater than a predetermined value, the burner corresponding to the regeneration bed with the lowest temperature is switched to burn, and other burners do not burn; When the burner is burning, the opening of the fuel valve corresponding to the burner, and the rotation speeds of the combustion-supporting fan and the exhaust fan are controlled.

9. The method for dynamically controlling the temperature of a smelting furnace according to claim 8, characterized in that: Also includes: Establishing and storing a standard table, wherein the standard table records the optimal fuel flow rate, combustion air flow rate, and exhaust flow rate corresponding to the current furnace temperature and the target furnace temperature; The standard table is read, and the opening of the optimal fuel valve, the rotation speed of the combustion-supporting fan and the exhaust fan corresponding to the burner currently burning are calculated according to the standard table.

10. The method for dynamically controlling the temperature of a smelting furnace according to claim 9, characterized in that: The standard table includes an efficiency standard table and an energy-saving standard table, which are calibrated based on the best smelting efficiency and the best energy-saving as standards respectively.

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