Control methods, devices and storage media for the vacuum chamber heating system of the RH refining furnace

Abstract

This invention provides a control method, device, and storage medium for a vacuum chamber heating system in an RH refining furnace. The method includes: when the vacuum chamber temperature is above a temperature threshold, receiving a selection of the heating mode and setting thresholds for first and second heating parameters; initiating the ignition procedure; opening the nitrogen and cooling water shut-off valves; controlling the top gun to descend to the ignition position; closing the purge shut-off valve; and opening the oxygen shut-off valve, oxygen flow regulating valve, gas shut-off valve, and gas flow regulating valve, and igniting the burner. The method also involves acquiring the first heating parameter value; extinguishing the flame when the first heating parameter value reaches the threshold; controlling the top gun to rise to the waiting position; acquiring the second heating parameter value; and igniting the flame when the second heating parameter value meets the conditions. This technical solution achieves automatic control of the RH refining furnace vacuum chamber heating system, improving the energy-saving and emission-reduction efficiency of the equipment, and ensuring production process safety by monitoring the operating status.

Description

Technical Field

[0001] This invention relates to the field of vacuum chamber heating in refining furnaces, and in particular to a control method, apparatus, and storage medium for a vacuum chamber heating system in an RH refining furnace. Background Technology

[0002] Steel production is a major carbon-emitting industry, and energy conservation and emission reduction face significant challenges under the dual requirements of carbon neutrality and production capacity. Currently, vacuum chamber heating requires micro-positive pressure control, and the insertion tube outlet needs to be enveloped by a flame, resulting in high fuel consumption. However, if a small flow rate of fuel is used for heating, the vacuum chamber cannot achieve effective positive pressure control, no flame emerges from the insertion tube, and a large temperature difference between the inside and outside of the tube wall, making it prone to crusting during normal production. Therefore, improving fuel efficiency in vacuum chamber heating while reducing the probability of production accidents is a problem that needs to be solved. Furthermore, manual management is common in the refining process, resulting in low efficiency. Summary of the Invention

[0003] This invention provides a control method, device, and storage medium for a vacuum chamber heating system in an RH refining furnace, to solve the problems of low fuel efficiency and excessive manpower in production management.

[0004] To achieve the above objectives, on the one hand, a control method for a vacuum chamber heating system of an RH refining furnace is provided. The heating system includes: a nitrogen pipeline, an oxygen pipeline, a gas pipeline, a cooling water inlet pipeline, a cooling water return pipeline, a top lance, a top lance lifting actuator, a burner, and a flame detector. The nitrogen pipeline is connected to the oxygen pipeline via a first shut-off valve, and the nitrogen pipeline is connected to the gas pipeline via a second shut-off valve. The oxygen pipeline is also equipped with an oxygen shut-off valve and an oxygen flow regulating valve. The gas pipeline is also equipped with a gas shut-off valve and a gas flow regulating valve. The cooling water inlet pipeline is equipped with a third shut-off valve. The control method includes:

[0005] S1, When the vacuum chamber reaches or exceeds a predetermined temperature threshold, in response to the selection of a heating mode, receive settings for a first heating parameter threshold and a second heating parameter threshold corresponding to the selected heating mode;

[0006] S2, in response to the start of heating ignition, the first shut-off valve and the second shut-off valve are opened, and nitrogen is purged simultaneously in the oxygen pipeline and the gas pipeline;

[0007] S3, Open the third shut-off valve to allow cooling water to flow in through the cooling water inlet pipe;

[0008] S4, control the top gun lifting actuator to lower the top gun, and when the top gun is lowered to the predetermined ignition position, close the first cut-off valve and the second cut-off valve, and open the oxygen cut-off valve and the oxygen flow regulating valve;

[0009] S5, When the oxygen flow rate reaches the predetermined oxygen flow rate value, open the gas shut-off valve and the gas flow rate regulating valve;

[0010] S6, when the gas flow rate reaches the predetermined gas flow rate value, the burner is ignited;

[0011] S7, when the flame detector detects a flame, it collects a first heating parameter value corresponding to the set first heating parameter threshold according to the selected heating mode, and when the first heating parameter value reaches the first heating parameter threshold, it closes the oxygen cut-off valve and the gas cut-off valve, opens the first cut-off valve and the second cut-off valve, and allows nitrogen to purge the oxygen pipeline and the gas pipeline.

[0012] S8, control the top gun lifting actuator to move, so that the top gun rises and reaches the predetermined waiting position, collect the second heating parameter value corresponding to the set second heating parameter threshold, and when the second heating parameter value meets the preset condition compared with the second heating parameter threshold, execute heating ignition.

[0013] Furthermore, in this control method, the heating mode includes a temperature mode and a time mode; the first heating parameter corresponding to the time mode is the combustion time, and the second heating parameter is the flameout time; the first heating parameter corresponding to the temperature mode is the flameout temperature, and the second heating parameter is the ignition temperature.

[0014] Furthermore, in this control method, when the selected heating mode is time mode, step S7 specifically involves: when the flame detector detects a flame, starting the combustion timer; when the combustion timer reaches the set combustion time, closing the oxygen cut-off valve and the gas cut-off valve, and opening the first cut-off valve and the second cut-off valve to purge the oxygen pipeline and the gas pipeline with nitrogen; step S8 specifically involves: controlling the top gun lifting motor to move, causing the top gun to rise; when it reaches the predetermined waiting position, starting the flameout timer; when the flameout timer reaches the set flameout time, performing heating ignition.

[0015] Furthermore, in this control method, when the selected heating mode is the temperature mode, step S7 specifically involves: when the flame detector detects a flame, the temperature of the vacuum chamber is collected; when the temperature of the vacuum chamber reaches the set extinguishing temperature, the oxygen shut-off valve and the gas shut-off valve are closed, and the first shut-off valve and the second shut-off valve are opened to extinguish the burner and purge the oxygen pipeline and the gas pipeline with nitrogen; step S8 specifically involves: controlling the top gun lifting motor to move, causing the top gun to rise, and when it reaches the predetermined waiting position, the temperature of the vacuum chamber is collected; when the temperature of the vacuum chamber is lower than the set ignition temperature, heating ignition is performed.

[0016] Furthermore, in this control method, the heating system also includes a thermocouple disposed within the vacuum chamber for collecting the temperature of the vacuum chamber.

[0017] Furthermore, in this control method, the heating system also includes a fault mode, and the control method includes:

[0018] During the control process, if one or more of the oxygen shut-off valve, the gas shut-off valve, and the third shut-off valve trigger a fault alarm, the heating system enters a fault mode. In the fault mode, the oxygen shut-off valve and the gas shut-off valve are closed, the burner is extinguished, and the first shut-off valve and the second shut-off valve are opened to purge the oxygen pipeline and the gas pipeline with nitrogen. When the selected heating mode is a time mode, the system also resets the combustion timer and the extinguishing timer to zero.

[0019] When the selected heating mode is temperature mode, if the oxygen shut-off valve and the gas shut-off valve are already open and the thermocouple malfunctions during the control process, the heating system enters fault mode. In the fault mode, the oxygen shut-off valve and the gas shut-off valve are closed, the burner is extinguished, and the first shut-off valve and the second shut-off valve are opened to purge the oxygen pipeline and the gas pipeline with nitrogen.

[0020] Furthermore, in this control method, in step S7, if the flame detector does not detect a flame or a fault alarm occurs, the heating system enters the fault mode. In the fault mode, the oxygen shut-off valve and the gas shut-off valve are closed, the burner is extinguished, and the first shut-off valve and the second shut-off valve are opened to purge the oxygen pipeline and the gas pipeline with nitrogen.

[0021] Furthermore, the control method further includes, before step S1, a step of diagnosing the top gun and the top gun lifting control mechanism;

[0022] Step S1 is executed only after the diagnosis is passed.

[0023] On the other hand, a control device for a vacuum chamber heating system of an RH refining furnace is provided, including a memory and a processor, wherein the memory stores at least one program, which is executed by the processor to implement the control method for the vacuum chamber heating system of the RH refining furnace as described above.

[0024] In another aspect, a computer-readable storage medium is provided, the storage medium storing a computer program that, when executed by a processor, implements the steps of the method described above.

[0025] The beneficial effects of the technology provided by this invention are:

[0026] The control scheme for the vacuum chamber heating system of the RH refining furnace in this embodiment of the invention enables automatic heat preservation control. Based on the actual characteristics of the RH refining furnace vacuum chamber, it selects an appropriate heating mode, such as a time mode or a temperature mode, to control the ignition and extinguishing of the top lance. This achieves intelligent regulation of fuel usage, ensures the heat preservation efficiency of the vacuum chamber, and effectively reduces gas consumption. Furthermore, the control scheme of this embodiment can automatically complete the ignition of the top lance at the bottom, the extinguishing of the top lance at the top, and fault diagnosis of the top lance heating system. Moreover, it can display the process status on the human-machine interface, reducing the labor intensity of workers, lowering the probability of production accidents, and improving production efficiency. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating the control method of the RH refining furnace vacuum chamber heating system according to an embodiment of the present invention.

[0028] Figure 2 A schematic diagram of the structure of the RH refining furnace vacuum chamber heating system controlled by the control method of this embodiment of the invention;

[0029] Figure 3 This is a schematic diagram of the control flow when using temperature mode in the control method of this embodiment of the invention;

[0030] Figure 4 This is a flowchart illustrating the control method of the present invention when a time-based mode is used.

[0031] Figure 5 This is a schematic diagram of the diagnostic process of the top gun device in the control method of this invention embodiment;

[0032] Figure 6 This is a schematic diagram of the automatic ignition process of the top gun in the control method of this invention embodiment;

[0033] Figure 7 This is a schematic diagram of the automatic flameout process of the top gun in the control method of this invention embodiment;

[0034] Figure 8 This is a schematic diagram of the control device for the vacuum chamber heating system of the RH refining furnace according to an embodiment of the present invention;

[0035] in, Figure 2 The annotations in the accompanying drawings are explained as follows:

[0036] 1-Oxygen pipeline pressure transmitter; 2-Gas pipeline pressure transmitter; 3-Cooling water inlet thermometer; 4-Cooling water return thermometer; 5-Argon pipeline integrated flow meter; 6-Nitrogen pipeline integrated flow meter; 7-Oxygen flow meter; 8-Oxygen branch flow meter; 9-Gas flow meter; 10-Cooling water inlet flow meter; 11-Cooling water return flow meter; 12-Oxygen flow regulating valve; 13-Oxygen branch flow regulating valve; 14-Gas flow regulating valve; 15-Argon pipeline to oxygen pipeline shut-off valve; 16-Nitrogen pipeline to gas pipeline shut-off valve; 17-Nitrogen pipeline to oxygen pipeline shut-off valve; 18-Oxygen shut-off valve; 19-Oxygen branch shut-off valve; 20-Gas shut-off valve; 21-Cooling water inlet shut-off valve; 22-Flame detector; 23-Top gun lifting motor; 24-Top gun position detection device; 25-Multi-functional burner; 26-Vacuum chamber thermocouple. Detailed Implementation

[0037] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar devices.

[0038] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0039] Example 1:

[0040] Figure 1 This is a flowchart illustrating the control method for the vacuum chamber heating system of an RH refining furnace according to an embodiment of the present invention. The heating system includes: a nitrogen pipeline, an oxygen pipeline, a gas pipeline, a cooling water inlet pipeline, a cooling water return pipeline, a top lance, a top lance lifting motor, a vacuum chamber thermocouple, a burner, and a flame detector. The nitrogen pipeline is connected to the oxygen pipeline via a first shut-off valve, and to the gas pipeline via a second shut-off valve. The oxygen pipeline is also equipped with an oxygen shut-off valve and an oxygen flow regulating valve, and the gas pipeline is also equipped with a gas shut-off valve and a gas flow regulating valve. A third shut-off valve is installed on the cooling water inlet pipeline. The specific implementation of the heating system can be found in [reference needed]. Figure 2As shown. Exemplarily, the control method of this embodiment includes the following steps performed by a controller such as a programmable logic controller (PLC):

[0041] S1, when the vacuum chamber reaches or exceeds a predetermined temperature threshold, in response to the selection of a heating mode, receive settings for a first heating parameter threshold and a second heating parameter threshold corresponding to the selected heating mode; for example, the temperature threshold is 650°C;

[0042] S2, in response to the start of heating ignition, opens the first and second shut-off valves, and simultaneously purges nitrogen into the oxygen and gas pipelines;

[0043] S3, open the third shut-off valve to allow cooling water to flow in through the cooling water inlet pipe;

[0044] S4 controls the top gun lifting motor to descend, and when the top gun descends to the predetermined ignition position, closes the first and second shut-off valves and opens the oxygen shut-off valve and oxygen flow regulating valve.

[0045] S5, When the oxygen flow rate reaches the predetermined oxygen flow rate value, open the gas shut-off valve and the gas flow regulating valve;

[0046] S6, when the gas flow rate reaches the predetermined gas flow rate value, the burner is ignited;

[0047] S7, when the flame detector detects a flame, the first heating parameter value corresponding to the set first heating parameter threshold is collected according to the selected heating mode, and when the first heating parameter value reaches the first heating parameter threshold, the oxygen cut-off valve and the gas cut-off valve are closed, and the first cut-off valve and the second cut-off valve are opened to purge the oxygen pipeline and the gas pipeline with nitrogen.

[0048] S8 controls the top gun lifting motor to move, causing the top gun to rise. When it reaches the predetermined waiting position, it collects the second heating parameter value corresponding to the set second heating parameter threshold. When the second heating parameter value meets the preset condition compared with the second heating parameter threshold, it executes heating ignition.

[0049] Specifically, the heating modes include a temperature mode and a time mode; the first heating parameter corresponding to the time mode is the combustion time, and the second heating parameter is the flameout time; the first heating parameter corresponding to the temperature mode is the flameout temperature, and the second heating parameter is the ignition temperature.

[0050] Specifically, refer to Figure 2 The diagram shows a schematic of the structure of the RH refining furnace vacuum chamber heating system controlled by the control method of an embodiment of the present invention.

[0051] like Figure 2The heating system of this embodiment includes: an argon pipeline, a nitrogen pipeline, an oxygen pipeline, a gas pipeline, a cooling water inlet pipeline, a cooling water return pipeline, a top gun, and a top gun lifting actuator. It also includes: an integrated argon pipeline flow meter 5 and an argon pipeline-to-oxygen pipeline shut-off valve 15 installed on the argon pipeline; an integrated nitrogen pipeline flow meter 6, a nitrogen pipeline-to-gas pipeline shut-off valve 16, and a nitrogen pipeline-to-oxygen pipeline shut-off valve 17 installed on the nitrogen pipeline; an oxygen pipeline pressure transmitter 1, an oxygen flow meter 7, an oxygen flow regulating valve 12, and an oxygen shut-off valve 18 installed on the oxygen pipeline; and a dedicated low-flow branch, including an oxygen branch flow meter 8. Oxygen branch flow regulating valve 13 and oxygen branch shut-off valve 19; gas pipeline pressure transmitter 2, gas flow meter 9, gas flow regulating valve 14 and gas shut-off valve 20 installed on the gas pipeline; cooling water inlet thermometer 3, cooling water inlet flow meter 10 and cooling water inlet shut-off valve 21 installed on the cooling water inlet pipeline; cooling water return thermometer 4 and cooling water return flow meter 11 installed on the cooling water return pipeline; flame detector 22 installed on the top of the top gun; multi-functional burner 25 installed on the bottom of the top gun; top gun lifting motor 23 and top gun position detection device 24 installed on the top gun lifting actuator; vacuum chamber thermocouple 26 installed in the vacuum chamber.

[0052] Figure 2 The oxygen pipeline has two paths for controlling oxygen flow and shut-off. For example, the path considered the main path includes oxygen flow meter 7, oxygen flow regulating valve 12, and oxygen shut-off valve 18; the path considered a branch path includes oxygen branch flow meter 8, oxygen branch flow regulating valve 13, and oxygen branch shut-off valve 19. The oxygen flow rate of the main path can be higher than that of the branch path. Only the main path or the branch path can be used. The main path is selected during normal operation. Depending on actual needs, when a small flow of oxygen is required, only the branch path of the oxygen pipeline can be used for small-flow oxygen delivery. When using the branch path, the oxygen branch shut-off valve and oxygen branch flow regulating valve are controlled in the same way as the oxygen shut-off valve and oxygen flow regulating valve of the main path, as described above.

[0053] In practice, a human-machine interface can be set up to allow users to select the heating mode and set the heating parameter threshold corresponding to the heating mode; and start the heating ignition process.

[0054] Now combine Figure 2This invention describes a control method for a heating system according to an embodiment of the invention. In this example, when the vacuum chamber temperature of the RH refining furnace reaches or exceeds 650°C, and the heating mode is selected as time-based, the combustion time and extinguishing time are set via a human-machine interface. After starting the heating and ignition process, the two shut-off valves connecting the nitrogen pipeline to the oxygen pipeline and the gas pipeline are opened, simultaneously purging the oxygen pipeline and the gas pipeline. The cooling water inlet shut-off valve is opened, the top gun lifting actuator is activated, the top gun descends, and after reaching the ignition position, the two shut-off valves connecting the nitrogen pipeline to the oxygen pipeline and the gas pipeline are closed. The oxygen shut-off valve opens, the oxygen flow regulating valve opens to adjust the oxygen flow to the set flow rate, the gas shut-off valve opens, the gas flow regulating valve opens to adjust the gas flow to the set flow rate, the burner is ignited, and after the flame detector detects the flame, the combustion timer starts timing. After the timing time exceeds the set combustion time, the oxygen shut-off valve and the gas shut-off valve close, the burner extinguishes, the combustion timer is reset to zero, the two shut-off valves connecting the nitrogen pipeline to the oxygen pipeline and the gas pipeline are opened, simultaneously purging the oxygen pipeline and the gas pipeline. The top gun lifting actuator is activated, the top gun rises, and after reaching the waiting position, the extinguishing timer starts timing. If the timeout exceeds the set shutdown time, the heating and ignition process will be automatically executed, and the shutdown timer will be reset to zero.

[0055] In another embodiment of the invention, when the heating mode is selected as temperature mode, the extinguishing temperature and ignition temperature are set via the human-machine interface. After the heating and ignition process is started, the two shut-off valves connecting the nitrogen pipeline to the oxygen pipeline and the gas pipeline are opened, and the oxygen pipeline and gas pipeline are purged simultaneously. The cooling water inlet shut-off valve is opened, the top gun lifting actuator is activated, the top gun descends, and after reaching the ignition position, the two shut-off valves connecting the nitrogen pipeline to the oxygen pipeline and the gas pipeline are closed. The oxygen shut-off valve opens, the oxygen flow regulating valve opens to adjust the oxygen flow to the set flow rate; the gas shut-off valve opens, the gas flow regulating valve opens to adjust the gas flow to the set flow rate, the burner is ignited, and after the flame detector detects the flame, the temperature of the vacuum chamber thermocouple is collected. When the vacuum chamber temperature is higher than the set extinguishing temperature, the valves of the oxygen pipeline and the gas pipeline are closed, the burner is extinguished, the two shut-off valves connecting the nitrogen pipeline to the oxygen pipeline and the gas pipeline are opened, the oxygen pipeline and gas pipeline are purged simultaneously, the top gun lifting actuator is activated, the top gun rises, and after reaching the waiting position, the temperature of the vacuum chamber thermocouple is collected. If the vacuum chamber temperature is lower than the set ignition temperature, the heating and ignition process is automatically executed.

[0056] Example 2:

[0057] Figure 3 This is a flowchart illustrating the control method according to another embodiment of the present invention, where the heating mode is a time-based mode. For example... Figure 3In this example, in addition to the basic control flow described above, it also includes sub-flows for top gun device diagnosis, automatic top gun ignition, and automatic top gun shutdown. These sub-flows will be described in detail later. Furthermore, it includes a step to determine whether the time mode is being executed; if so, it returns to the top gun device diagnosis step; otherwise, it ends the time mode. Using the diagnostic flow, subsequent steps only proceed after the device passes the diagnosis and is determined to be normal, thus avoiding potential dangers.

[0058] Figure 4 This is a flowchart illustrating the control method according to another embodiment of the present invention, where the heating mode is a temperature mode. For example... Figure 4 In this example, in addition to the basic control flow described above, it also includes sub-flows for top gun device diagnosis, automatic top gun ignition, and automatic top gun shutdown. These sub-flows will be described in detail later. Furthermore, it includes a step to determine whether the temperature mode is being executed; if so, it returns to the top gun device diagnosis step; otherwise, it terminates the temperature mode. Using the diagnostic flow, subsequent steps only proceed after the device passes the diagnosis and is determined to be normal.

[0059] The above method enables automatic control of the heating system. In other implementations of the invention, argon can be used instead of nitrogen, depending on the quality requirements of the molten steel being produced.

[0060] In another embodiment of the control method of the present invention, the step of putting the heating system into a fault mode is further included, specifically including:

[0061] When the selected heating mode is time mode, if one or more of the oxygen shut-off valve, gas shut-off valve, and third shut-off valve malfunction during the control process, the heating system enters fault mode. In fault mode, the oxygen shut-off valve and gas shut-off valve are closed, the burner is extinguished, the first shut-off valve and the second shut-off valve are opened, nitrogen is used to purge the oxygen and gas pipelines, and the combustion timer and extinguishing timer are reset to zero. Furthermore, the automatic control program for vacuum chamber heating is exited, manual mode is switched, and the human-machine interface alarms, waiting for manual intervention to troubleshoot the fault.

[0062] or,

[0063] When the selected heating mode is temperature mode, if one or more of the oxygen shut-off valve, gas shut-off valve, and third shut-off valve malfunction during the control process, the heating system enters fault mode. In fault mode, the oxygen shut-off valve and gas shut-off valve are closed, the burner is extinguished, and the first and second shut-off valves are opened to purge the oxygen and gas pipelines with nitrogen. Furthermore, the automatic control program for vacuum chamber heating is exited, manual mode is switched to, and the human-machine interface alarms, awaiting manual intervention to troubleshoot the fault.

[0064] or,

[0065] When the selected heating mode is temperature mode, if the oxygen shut-off valve and gas shut-off valve are already open and the thermocouple malfunctions, the heating system enters fault mode during the control process. In fault mode, the oxygen shut-off valve and gas shut-off valve are closed, the burner is extinguished, and the first and second shut-off valves are opened to purge the oxygen and gas pipelines with nitrogen. Furthermore, the automatic control program for vacuum chamber heating is exited, manual mode is switched to, and the human-machine interface alarms, waiting for manual intervention to troubleshoot the fault.

[0066] or,

[0067] In step S7, if the flame detector does not detect a flame or a fault alarm occurs, the heating system enters a fault mode. In the fault mode, the oxygen shut-off valve and the gas shut-off valve are closed, the burner is extinguished, and the first shut-off valve and the second shut-off valve are opened to purge the oxygen pipeline and the gas pipeline with nitrogen. Furthermore, the automatic control program for vacuum chamber heating is exited, and manual mode is switched to, and the human-machine interface alarms, waiting for manual intervention to troubleshoot the fault.

[0068] like Figure 5 This is a schematic flowchart illustrating the diagnostic process for a top-gun device in the control method of this invention. The top-gun device includes a top gun and a top gun lifting actuator. Figure 5 The diagnostic process for top gun devices includes the following steps:

[0069] The action time, limit switch signal, and valve action control signal of the nitrogen pipeline to oxygen pipeline shut-off valve 17 and nitrogen pipeline to gas pipeline shut-off valve 16 are detected. If the results are normal, proceed to the next step; otherwise, the diagnostic result is set to abnormal and the top gun equipment diagnostic steps are exited.

[0070] Compare the preset values ​​of the PID parameters of the oxygen flow meter 7 and the gas flow meter 9 with the actual values. If the result is normal, proceed to the next step; otherwise, set the diagnostic result to abnormal and exit the top gun equipment diagnostic step.

[0071] Test the action time, limit switch signal and valve action control signal of oxygen shut-off valve 18 and gas shut-off valve 20. If the results are normal, proceed to the next step; otherwise, set the diagnostic result to abnormal and exit the top gun equipment diagnostic step.

[0072] If the cooling water inlet flow meter 10 is detected and the inlet flow rate is greater than or equal to the preset minimum flow rate, proceed to the next step; otherwise, the diagnostic result is set to abnormal and the top gun equipment diagnostic step is exited.

[0073] If the difference between the inlet flow rate and the return flow rate of the cooling water return flow meter 11 is less than the preset maximum flow rate difference, proceed to the next step; otherwise, the diagnostic result is set to abnormal and the top gun equipment diagnostic step is exited.

[0074] If the temperature difference between the cooling water inlet thermometer 3 and the cooling water return thermometer 4 is less than the preset maximum temperature difference, proceed to the next step; otherwise, the diagnostic result is set to abnormal, and the top gun equipment diagnostic step is exited.

[0075] If the electrical equipment of the top gun is found to be fault-free, the diagnostic result is set to normal, and the top gun equipment diagnostic step is exited; otherwise, the diagnostic result is set to abnormal, and the top gun equipment diagnostic step is exited.

[0076] Figure 6 This is a schematic diagram of the automatic ignition process of the top gun in the control method of this invention. Figure 6 As shown, the automatic ignition of the top gun includes the following steps:

[0077] The nitrogen pipeline connecting to the gas pipeline shut-off valve 16 and the nitrogen pipeline connecting to the oxygen pipeline shut-off valve 17 are opened to purge the oxygen pipeline and the gas pipeline. At the same time, the top gun lifting motor 23 controls the top gun to descend.

[0078] The position detection device 24 monitors the position of the top gun in real time. After reaching the ignition position, the top gun lifting motor 23 stops operating.

[0079] The nitrogen pipeline connection gas pipeline shut-off valve 16 and the nitrogen pipeline connection oxygen pipeline shut-off valve 17 are closed;

[0080] Oxygen shut-off valve 18 and gas shut-off valve 20 are opened;

[0081] Oxygen flow regulating valve 12 and gas flow regulating valve 14 are opened.

[0082] Figure 7 This is a schematic diagram illustrating the automatic shut-off process of the top gun in the control method of this invention. Figure 7 As shown, the automatic shut-off of the top gun includes the following steps:

[0083] Oxygen shut-off valve 18 and gas shut-off valve 20 are closed;

[0084] Oxygen flow regulating valve 12 and gas flow regulating valve 14 are closed;

[0085] The top gun lifting motor 23 controls the top gun to rise to the waiting position;

[0086] The nitrogen pipeline connecting to the gas pipeline shut-off valve 16 and the nitrogen pipeline connecting to the oxygen pipeline shut-off valve 17 are opened to purge the oxygen pipeline and the gas pipeline.

[0087] The present invention also provides a control device for a vacuum chamber heating system of an RH refining furnace, such as... Figure 8As shown, the device includes a processor 801, a memory 802, a bus 803, and a computer program stored in the memory 802 and executable on the processor 801. The processor 801 includes one or more processing cores. The memory 802 is connected to the processor 801 via the bus 803 and is used to store program instructions. When the processor executes the computer program, it implements the steps in the method embodiment described in Embodiment 1 of the present invention. Exemplarily, the above-described control device can be implemented as a programmable logic controller (PLC).

[0088] Furthermore, as an executable solution, the control device can be a computer unit, which can be an industrial programmable logic controller, desktop computer, laptop, handheld computer, cloud server, or other computing device. The computer unit may include, but is not limited to, a processor and memory. Those skilled in the art will understand that the above-described structure of the computer unit is merely an example and does not constitute a limitation on the computer unit. It may include more or fewer components, or combine certain components, or use different components. For example, the computer unit may also include input / output devices, network access devices, buses, etc., and this embodiment of the invention does not limit this.

[0089] Furthermore, as an executable solution, the processor can be a Central Processing Unit (CPU), or other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc. The processor is the control center of the computer unit, connecting various parts of the entire computer unit via various interfaces and lines. The memory can be used to store the computer programs and / or modules. The processor implements various functions of the computer unit by running or executing the computer programs and / or modules stored in the memory, and by calling data stored in the memory. The memory can mainly include a program storage area and a data storage area. The program storage area can store the operating system and at least one application program required for a function; the data storage area can store data created according to the use of the program, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0090] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the method described in the embodiments of the present invention.

[0091] If the modules / units integrated in the computer unit are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction.

[0092] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A control method for a vacuum chamber heating system of an RH refining furnace, the heating system comprising: The system comprises a nitrogen pipeline, an oxygen pipeline, a gas pipeline, a cooling water inlet pipeline, a cooling water return pipeline, a top gun, a top gun lifting actuator, a burner, and a flame detector. The flame detector is located at the top of the top gun, the burner is located at the bottom of the top gun, and the top gun is positioned above a vacuum chamber. The top gun lifting actuator is equipped with a top gun lifting motor and a top gun position detection device. The nitrogen pipeline is connected to the oxygen pipeline via a first shut-off valve, and the nitrogen pipeline is connected to the gas pipeline via a second shut-off valve. The oxygen pipeline is also equipped with an oxygen shut-off valve and an oxygen flow regulating valve. The gas pipeline is also equipped with a gas shut-off valve and a gas flow regulating valve. The cooling water inlet pipeline is equipped with a third shut-off valve. The control method includes: S1, When the vacuum chamber reaches or exceeds a predetermined temperature threshold, in response to the selection of a heating mode, receive the setting of a first heating parameter threshold and a second heating parameter threshold corresponding to the selected heating mode; S2, in response to the start of heating ignition, the first shut-off valve and the second shut-off valve are opened, and nitrogen is purged simultaneously in the oxygen pipeline and the gas pipeline; S3, Open the third shut-off valve to allow cooling water to flow in through the cooling water inlet pipe; S4, control the top gun lifting actuator to lower the top gun, and when the top gun is lowered to the predetermined ignition position, close the first cut-off valve and the second cut-off valve, and open the oxygen cut-off valve and the oxygen flow regulating valve; S5, When the oxygen flow rate reaches the predetermined oxygen flow rate value, open the gas shut-off valve and the gas flow rate regulating valve; S6, when the gas flow rate reaches the predetermined gas flow rate value, the burner is ignited; S7, when the flame detector detects a flame, it collects a first heating parameter value corresponding to the set first heating parameter threshold according to the selected heating mode, and when the first heating parameter value reaches the first heating parameter threshold, it closes the oxygen cut-off valve and the gas cut-off valve, opens the first cut-off valve and the second cut-off valve, and allows nitrogen to purge the oxygen pipeline and the gas pipeline. S8, control the top gun lifting actuator to move, so that the top gun rises and reaches the predetermined waiting position, collect the second heating parameter value corresponding to the set second heating parameter threshold, and when the second heating parameter value meets the preset condition compared with the second heating parameter threshold, execute heating ignition; The heating mode includes a temperature mode and a time mode; the first heating parameter corresponding to the time mode is the combustion time, and the second heating parameter is the flameout time; the first heating parameter corresponding to the temperature mode is the flameout temperature, and the second heating parameter is the ignition temperature. Before step S1, the procedure further includes a step of diagnosing the top gun and the top gun lifting actuator; step S1 is executed only after the diagnosis is passed.

2. The control method according to claim 1, characterized in that, When the selected heating mode is time mode, step S7 specifically involves: when the flame detector detects a flame, starting the combustion timer; when the combustion timer reaches the set combustion time, closing the oxygen cut-off valve and the gas cut-off valve, and opening the first cut-off valve and the second cut-off valve to purge the oxygen pipeline and the gas pipeline with nitrogen; step S8 specifically involves: controlling the top gun lifting actuator to move, causing the top gun to rise; when it reaches the predetermined waiting position, starting the flameout timer; when the flameout timer reaches the set flameout time, performing heating ignition.

3. The control method according to claim 1, characterized in that, When the selected heating mode is temperature mode, step S7 specifically involves: when the flame detector detects a flame, the temperature of the vacuum chamber is collected; when the temperature of the vacuum chamber reaches the set extinguishing temperature, the oxygen shut-off valve and the gas shut-off valve are closed, and the first shut-off valve and the second shut-off valve are opened to extinguish the burner and purge the oxygen pipeline and the gas pipeline with nitrogen; step S8 specifically involves: controlling the top gun lifting actuator to move, so that the top gun rises and reaches the predetermined waiting position, the temperature of the vacuum chamber is collected; when the temperature of the vacuum chamber is lower than the set ignition temperature, heating ignition is performed.

4. The control method according to claim 1, characterized in that, The heating system also includes a thermocouple disposed within the vacuum chamber for collecting the temperature of the vacuum chamber.

5. The control method according to claim 2, characterized in that, The heating system also includes a fault mode, and the control method includes: During the control process, if one or more of the oxygen shut-off valve, the gas shut-off valve, and the third shut-off valve trigger a fault alarm, the heating system enters a fault mode. In the fault mode, the oxygen shut-off valve and the gas shut-off valve are closed, the burner is extinguished, and the first shut-off valve and the second shut-off valve are opened to purge the oxygen pipeline and the gas pipeline with nitrogen. When the selected heating mode is a time mode, the combustion timer and the flameout timer are also reset to zero. When the selected heating mode is temperature mode, if the oxygen shut-off valve and the gas shut-off valve are already open and the thermocouple malfunctions during the control process, the heating system enters fault mode; in the fault mode, the oxygen shut-off valve and the gas shut-off valve are closed, the burner is extinguished, and the first shut-off valve and the second shut-off valve are opened to purge the oxygen pipeline and the gas pipeline with nitrogen.

6. The control method according to claim 1, characterized in that, The heating system also includes a fault mode, and the control method includes: In step S7, if the flame detector does not detect a flame or a fault alarm occurs, the heating system enters the fault mode. In the fault mode, the oxygen shut-off valve and the gas shut-off valve are closed, the burner is extinguished, and the first shut-off valve and the second shut-off valve are opened to purge the oxygen pipeline and the gas pipeline with nitrogen.

7. A control device for a vacuum chamber heating system of an RH refining furnace, characterized in that, The system includes a memory and a processor, the memory storing at least one program, which is executed by the processor to implement the control method for the RH refining furnace vacuum chamber heating system as described in any one of claims 1 to 6.

8. A computer-readable storage medium, characterized in that, The storage medium stores at least one program segment, which is executed by a processor to implement the control method for the RH refining furnace vacuum chamber heating system as described in any one of claims 1 to 6.

Images