Electric heating furnace with explosion-proof function and explosion-proof method thereof

Abstract

The application relates to an electric heating furnace with an anti-explosion function and an anti-explosion method thereof, and relates to the field of electric heating furnaces. The electric heating furnace comprises an anti-explosion gas input module, a wiring chamber, a pressure control module, an anti-explosion gas circulation module and a furnace body. The wiring chamber comprises an external power line and a gas phase interface, and the furnace body comprises a shell and an electric heating element located in the shell. The electric heating element extends into the shell through a connecting hole on the wiring chamber. A gas hole is arranged on the side wall of the shell connected with the wiring chamber. The anti-explosion gas input module is used for inputting anti-explosion gas into the wiring chamber. The wiring chamber is used for transferring the anti-explosion gas into the furnace body. The anti-explosion gas enters the wiring chamber through the gas phase interface, enters the furnace body through the gas hole and enters the pressure control module. The pressure control module is used for adjusting the internal pressure of the electric heating furnace. The anti-explosion gas circulation module is used for sending the anti-explosion gas into the anti-explosion gas input module. The application has the effect of improving the anti-explosion performance of the electric heating furnace.

Description

Technical Field

[0001] This application relates to the field of electric heating furnaces, and in particular to an electric heating furnace with explosion-proof function and the explosion-proof method thereof. Background Technology

[0002] Heating furnaces are core equipment in the petrochemical industry and major energy-consuming devices in petrochemical plants. They provide heat or power to the operation of petrochemical plants using fuels such as natural gas and oil. The flue gas emitted contains a large amount of harmful components such as particulate matter, nitrogen oxides, sulfur oxides, and greenhouse gases such as carbon dioxide. Therefore, replacing traditional fossil fuels with electricity has become an important way for the petrochemical industry to develop towards green and low-carbon practices, and electric heating furnaces have become a key area for promotion as alternative equipment.

[0003] The relevant technology employs an explosion-proof junction box for explosion protection. An explosion-proof junction box is installed at the top of the electric heating furnace, and heating tubes are installed on the inner wall of the top of the furnace. The wires of the explosion-proof junction box are connected to the ends of the heating tubes. A temperature alarm is installed on the inner wall of the top of the electric heating furnace. When the temperature alarm reading is abnormal, the explosion-proof junction box will cut off the heating tubes to ensure the safety of the electric heating furnace.

[0004] The aforementioned technologies cannot effectively cover the components inside the electric heating furnace, resulting in a decrease in the safety factor of the explosion-proof junction box. Summary of the Invention

[0005] To improve the explosion-proof performance of electric heating furnaces, this application provides an electric heating furnace with explosion-proof function and its explosion-proof method.

[0006] In the first aspect, this application provides an electric heating furnace with explosion-proof function, which adopts the following technical solution: An explosion-proof electric heating furnace includes an explosion-proof gas input module, a wiring chamber, a pressure control module, an explosion-proof gas circulation module, and a furnace body. The wiring chamber includes an external power cord and a gas phase interface. The furnace body includes a shell and an electric heating element located inside the shell. The electric heating element extends into the shell through a connection hole on the wiring chamber. A vent is provided on the side wall of the shell that connects to the wiring chamber. The explosion-proof gas input module is used to introduce explosion-proof gas into the wiring chamber; The wiring chamber is used to transfer explosion-proof gas into the furnace body; wherein, the explosion-proof gas enters the wiring chamber through the gas phase interface, then enters the furnace body through the gas hole, and then enters the pressure control module; The pressure control module is used to regulate the internal pressure of the electric heating furnace; The explosion-proof gas circulation module is used to send the explosion-proof gas discharged from the pressure control module into the explosion-proof gas input module.

[0007] By adopting the above technical solution, a complete and closed explosion-proof gas protection and circulation loop is formed by setting up an explosion-proof gas input module, an electric heating furnace, a pressure control module, and an explosion-proof gas circulation module. The explosion-proof gas enters through the gas phase interface of the wiring compartment and enters the heating chamber through the vents on the side wall of the casing, effectively surrounding and isolating the electric heating element to prevent it from contacting the external hazardous environment and causing an explosion. Simultaneously, the circulation module can recover and reuse the discharged gas, improving the utilization efficiency of the explosion-proof gas and reducing operating costs.

[0008] Optionally, the explosion-proof gas input module includes a first oxygen detector, a thermometer, a first pressure gauge, a flow meter, a flow regulating valve, and a shut-off valve; The first oxygen detector is used to detect the oxygen content in the explosion-proof gas; the thermometer is used to measure the temperature of the explosion-proof gas; the first pressure gauge is used to measure the pressure of the explosion-proof gas; the flow meter is used to measure the flow rate of the explosion-proof gas; the flow regulating valve is used to regulate the flow rate of the explosion-proof gas entering the electric heating furnace; and the shut-off valve is used to control the on / off of the explosion-proof gas entering the electric heating furnace.

[0009] By adopting the above technical solution, and integrating a first oxygen detector, thermometer, first pressure gauge, flow meter, flow regulating valve, and shut-off valve into the explosion-proof gas input module, real-time monitoring and precise control of multiple parameters of the input explosion-proof gas are achieved. This ensures that the gas introduced into the electric heating furnace is always in a safe state with low oxygen, suitable flow rate, and appropriate temperature, guaranteeing the effectiveness of explosion protection from the source. The coordinated operation of all components allows for timely adjustment or shut-off of the gas supply in case of abnormal gas parameters, improving the active safety and reliability of the electric heating furnace input.

[0010] Optionally, the pressure control module includes a cooler, a second oxygen detector, a combustible gas detector, a second pressure gauge, a pressure regulating valve, and a pressure relief valve; The cooler is used to cool the explosion-proof gas discharged from the electric heating furnace; the second oxygen detector is used to detect the oxygen content in the explosion-proof gas; the combustible gas detector is used to detect the content of combustible gas in the explosion-proof gas; the second pressure gauge is used to measure the pressure of the explosion-proof gas; the pressure regulating valve is used to adjust the internal pressure of the electric heating furnace; and the pressure relief valve is used to reduce the internal pressure of the electric heating furnace.

[0011] By adopting the above technical solution, the pressure control module integrates a cooler, a second oxygen detector, a combustible gas detector, a second pressure gauge, a pressure regulating valve, and a pressure relief valve. This configuration can cool the circulating gas and continuously monitor its oxygen and combustible gas content, effectively monitoring the internal safety status of the electric heating furnace. Through the monitoring of the pressure gauge and the cooperation of the regulating valve and pressure relief valve, the internal pressure of the electric heating furnace can be automatically maintained to stabilize, and pressure can be quickly released when the gas composition is unqualified or overpressure is exceeded, preventing safety risks caused by pressure accumulation and the accumulation of dangerous gases.

[0012] Secondly, this application provides an explosion-proof method for an electric heating furnace, employing the following technical solution: An explosion-proof method for an electric heating furnace, comprising: The parameters of the explosion-proof gas in the explosion-proof gas input module are monitored to obtain the first explosion-proof gas parameters, which include the input temperature, input pressure, input flow rate and oxygen content. The input flow rate is compensated and corrected based on the input temperature and the input pressure to obtain the actual flow rate; Based on the difference between the actual flow rate and the preset flow rate, adjust the opening of the flow regulating valve so that the difference is less than the preset difference threshold. The parameters of the explosion-proof gas in the pressure control module are monitored to obtain the second explosion-proof gas parameters, which include the output pressure and the output gas parameters, including the combustible gas content and the oxygen content. If the output pressure is greater than the preset pressure threshold, or the combustible gas content is greater than the first preset content, or the oxygen content is greater than the second preset content, then the pressure relief valve is opened and the emergency shut-off valve in the explosion-proof gas circulation module is closed. If the output pressure is not greater than the preset pressure threshold, the combustible gas content is not greater than the first preset content, and the oxygen content is not greater than the second preset content, then the explosion-proof gas circulation module is kept in the open state.

[0013] By adopting the above technical solution, the flow rate of the input gas is monitored and compensated in real time to ensure that the actual flow rate entering the equipment accurately meets the preset requirements, thus guaranteeing the basic protection effect. Simultaneously, the pressure, combustible gas content, and oxygen content of the circulating gas are continuously monitored, and clear linkage control logic is set. When any safety parameter exceeds the standard, it can automatically trigger pressure relief and cut off circulation; otherwise, it maintains circulation operation. This achieves multiple, automatic safety monitoring and rapid emergency response during the operation of the electric heating furnace, improving the overall proactiveness and intelligence level of explosion protection.

[0014] Optionally, the shut-off valve is opened and the pressure relief valve is opened; When the oxygen content of the external explosion-proof gas is less than the third preset content, explosion-proof gas is introduced into the electric heating furnace; wherein, the explosion-proof gas passes sequentially through the explosion-proof gas input module, the wiring chamber, the furnace body, the pressure control module and the explosion-proof gas circulation module; If the oxygen content is less than the fourth preset content, close the pressure relief valve.

[0015] By adopting the above technical solution, with the input valve open and the pressure relief valve in operation, the external gas is first confirmed to be qualified before the explosion-proof gas is introduced, and a specific oxygen content standard is set to close the pressure relief valve. This process ensures that during the start-up and gas filling phase, the existing air is first removed, and a qualified explosion-proof gas environment with extremely low oxygen content is gradually established, laying the foundation for the safe operation of the electric heating furnace and avoiding potential risks during the start-up phase.

[0016] Optionally, when introducing explosion-proof gas into the electric heating furnace, the exhaust channel between the furnace body and the pressure control module is closed; The internal pressure of the furnace body is obtained to determine the internal pressure of the equipment. The opening step includes opening the exhaust passage when the internal pressure of the device is greater than the first preset exhaust pressure. Perform a recording step, the recording step including recording the oxygen content to obtain an oxygen content set; Perform a shutdown step, the shutdown step including closing the exhaust passage when the internal pressure of the device is less than the second preset exhaust pressure, the second preset exhaust pressure being less than the first preset exhaust pressure; The value retrieval step includes retrieving the maximum value from the set of oxygen contents to obtain the maximum oxygen content. Repeat the opening step, the recording step, the closing step, and the value retrieval step until the maximum oxygen content is less than the fourth preset content.

[0017] By employing the above technical solution, dynamic flow conditions are created through intermittent opening / closing of the exhaust channel combined with internal pressure threshold control to efficiently replace gas in dead zones inside the equipment. Simultaneously, the oxygen content during each exhaust is recorded, and the maximum value is used as an indicator for iterative replacement. This method ensures that the oxygen content throughout the electric heating furnace is effectively reduced and ultimately reaches safety standards, improving the thoroughness and reliability of the replacement process.

[0018] Optionally, the exhaust channel can be divided into several subsets of exhaust channels based on the spatial projection of the electric heating element on the exhaust channel; According to the location distribution of the exhaust channel subset, the arrangement order of the exhaust channel subset is set, wherein the distance between adjacent exhaust channels in the real space is greater than a preset distance in the arrangement order; The exhaust channels are opened sequentially according to the stated arrangement.

[0019] By adopting the above technical solution, the channels are divided according to the spatial projection of the electric heating element and the opening sequence is set to ensure that adjacent exhaust channels in space do not open at the same time. This orderly and spaced opening method helps the explosion-proof gas to form a more uniform and stable flow field in the heating chamber, avoiding local airflow short circuits or disturbances caused by the simultaneous opening of multiple adjacent exhaust ports, thereby improving the uniformity of gas replacement and overall efficiency.

[0020] Optionally, after each repetition, a target oxygen content greater than a fifth preset content is determined from the set of oxygen contents; Determine the exhaust channel corresponding to the target oxygen content to obtain the target exhaust channel; Open the target exhaust passage and close all other exhaust passages except the target exhaust passage; Adjust the opening of the flow regulating valve according to the preset flow rate so that the flow rate entering the furnace body is the preset flow rate.

[0021] By employing the above technical solution, after each replacement cycle, the system can accurately locate target exhaust channels where the oxygen concentration still exceeds the safety threshold based on recorded oxygen content data. By opening only these specific channels and adjusting the input flow rate to a preset value, the airflow can be concentrated for targeted and intensified replacement of these high-oxygen areas. This significantly improves purging efficiency and reduces the consumption of explosion-proof gas.

[0022] Optionally, if the number of target exhaust channels is greater than a preset number, the current concentration of the target exhaust channels is calculated; If the current clustering degree is greater than the preset clustering degree, then the target exhaust channel is clustered to obtain a channel cluster; the largest channel cluster in the channel cluster is selected; and the exhaust channel in the largest channel cluster is taken as the target exhaust channel. If the current aggregation degree is not greater than the preset aggregation degree, then all exhaust channels are set as the target exhaust channels.

[0023] By employing the above technical solution, when there are a large number of target channels, their spatial clustering is calculated. If the clustering is too high, cluster analysis is performed, and only the channels within the largest cluster are selected as the final targets. This avoids the problem of airflow dispersion and reduced replacement effect caused by overly dispersed target channels. This strategy can intelligently and dynamically optimize airflow resource allocation based on the distribution of hyperoxygen regions, ensuring efficient and focused replacement operations even under complex conditions.

[0024] Optionally, retrieve current system parameters; Extract historical system parameters from historical operation records; Calculate the difference between the current system parameters and the historical system parameters to obtain the system parameter difference; If the difference in the system parameters is greater than a preset difference threshold, the current system parameters are adjusted with reference to the historical system parameters.

[0025] By adopting the above technical solution, the current operating parameters are compared with historical normal parameters. When the deviation exceeds the threshold, the current parameters can be automatically adjusted based on historical data. This helps the electric heating furnace adapt to the possible performance degradation of components or slow changes in operating conditions during long-term operation, enabling its operating state to actively approach the historical optimal state. This maintains the long-term, stable, high-performance explosion-proof effect of the electric heating furnace and provides a certain degree of fault warning and adaptive adjustment capability.

[0026] Thirdly, this application provides a smart terminal, which adopts the following technical solution: A smart terminal includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and execute the method described in any one of the above.

[0027] Fourthly, this application provides a computer storage medium capable of storing corresponding programs, which facilitates the improvement of the explosion-proof performance of electric heating furnaces, and adopts the following technical solution: A computer-readable storage medium storing a computer program that can be loaded by a processor and executed for any of the above-described explosion-proof methods for electric heating furnaces.

[0028] In summary, this application includes at least one of the following beneficial technical effects: 1. By incorporating an explosion-proof gas input module, a pressure control module, and an explosion-proof gas circulation module, a complete and closed explosion-proof gas protection and circulation loop is formed. The explosion-proof gas enters through the gas phase interface of the wiring compartment and then enters the heating chamber through vents in the side wall of the housing, effectively surrounding and isolating the electric heating element to prevent it from contacting the external hazardous environment and causing an explosion. Simultaneously, the circulation module can recover and reuse the discharged gas, improving the utilization efficiency of the explosion-proof gas and reducing operating costs. 2. By monitoring and compensating for the flow rate of the input gas in real time, the actual flow rate entering the equipment is ensured to accurately meet the preset requirements, guaranteeing the basic protection effect. Simultaneously, the pressure, combustible gas content, and oxygen content of the circulating gas are continuously monitored, and clear linkage control logic is set. When any safety parameter exceeds the standard, it can automatically trigger pressure relief and cut off circulation; otherwise, it maintains circulation operation. This achieves multiple, automatic safety monitoring and rapid emergency response during the operation of the electric heating furnace, improving the overall proactiveness and intelligence level of explosion protection. 3. With the input gas supply open and the pressure relief valve open, first confirm that the external gas is qualified before introducing explosion-proof gas into the electric heater, and set a specific oxygen content standard before closing the pressure relief valve. This process ensures that during the start-up and gas charging phase of the electric heater, the existing air is first purged, and a qualified explosion-proof gas environment with extremely low oxygen content is gradually established, laying the foundation for the safe operation of the electric heater and avoiding potential risks during the start-up phase. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an electric heating furnace with explosion-proof function disclosed in an embodiment of this application.

[0030] Figure 2 This is a schematic diagram of a furnace body disclosed in an embodiment of this application.

[0031] Figure 3 This is a schematic diagram of a wiring compartment in section AA, as disclosed in an embodiment of this application.

[0032] Figure 4 This is a schematic diagram of a wiring compartment in section BB disclosed in an embodiment of this application.

[0033] Figure 5 This is a schematic flowchart of an explosion-proof method for an electric heating furnace disclosed in an embodiment of this application.

[0034] Figure 6 This is a flowchart illustrating a pre-start method for an electric heating furnace disclosed in an embodiment of this application.

[0035] Figure 7 This is a flowchart illustrating a second pre-start method for an electric heating furnace disclosed in an embodiment of this application.

[0036] Figure 8 This is a flowchart illustrating a method for opening an exhaust channel as disclosed in an embodiment of this application.

[0037] Figure 9 This is a schematic flowchart of a gas replacement method for an electric heating furnace disclosed in an embodiment of this application.

[0038] Figure 10This is a flowchart illustrating a method for determining a target exhaust channel disclosed in an embodiment of this application.

[0039] Figure 11 This is a flowchart illustrating a method for adjusting system parameters disclosed in an embodiment of this application.

[0040] Explanation of reference numerals in the attached diagram: 1. Explosion-proof gas input module; 2. Wiring compartment; 3. Pressure control module; 4. Explosion-proof gas circulation module; 5. Furnace body; 11. First oxygen detector; 12. Thermometer; 13. First pressure gauge; 14. Flow meter; 15. Flow regulating valve; 16. Shut-off valve; 21. External power cord; 22. Gas phase interface; 23. Connection hole; 24. Gas port; 31. Second pressure gauge; 32. Pressure regulating valve; 33. Pressure relief valve; 34. Combustible gas detector; 35. Second oxygen detector; 36. Cooler; 41. Explosion-proof gas circulation equipment; 42. Emergency shut-off valve; 51. Electric heating element; 52. Furnace tube. Detailed Implementation

[0041] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 1 To be continued Figure 11 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0042] This application discloses an electric heating furnace with explosion-proof function. (Refer to...) Figure 1 The electric heating furnace includes an explosion-proof gas input module 1, a wiring chamber 2, a pressure control module 3, an explosion-proof gas circulation module 4, and a furnace body 5. It should be noted that... Figure 1 Only piping and equipment related to explosion-proof gases are shown; information regarding the heating medium used in the electric heating furnace is not included. Figure 1 As shown in the image.

[0043] The explosion-proof gas input module 1 is used to introduce explosion-proof gas into the wiring chamber 2. The explosion-proof gas input module 1 includes a first oxygen detector 11, a thermometer 12, a first pressure gauge 13, a flow meter 14, a flow regulating valve 15, and a shut-off valve 16. The first oxygen detector 11 is used to detect the oxygen content in the explosion-proof gas. The thermometer 12 is used to measure the temperature of the explosion-proof gas. The first pressure gauge 13 is used to measure the pressure of the explosion-proof gas. The flow meter 14 is used to measure the flow rate of the explosion-proof gas. The flow regulating valve 15 is used to regulate the flow rate of the explosion-proof gas entering the furnace body 5. The shut-off valve 16 is used to control the on / off of the explosion-proof gas entering the furnace body 5.

[0044] Optionally, the type of explosion-proof gas is not limited to one or more combinations of inert gases such as nitrogen, carbon dioxide, argon, and helium.

[0045] For example, after the explosion-proof gas enters the electric heating furnace, it is first detected by the first oxygen detector 11 to ensure that the oxygen content in the explosion-proof gas meets the safety requirements. Then, the explosion-proof gas passes through the thermometer 12, the first pressure gauge 13, and the flow meter 14 in sequence to measure its temperature, pressure, and flow rate. At the same time, the temperature and pressure measurement data are input into the flow meter 14 for temperature and pressure compensation correction to ensure the accuracy of the flow meter 14. After the flow rate is regulated by the flow regulating valve 15, it enters the wiring chamber 2 in the furnace body 5.

[0046] The wiring chamber 2 is used to transfer explosion-proof gas into the furnace body 5. The explosion-proof gas enters the wiring chamber 2 through the gas phase interface 22, then enters the furnace body 5 through the vent 24, and finally enters the pressure control module 3. The wiring chamber 2 includes an external power cord 21 and a gas phase interface 22. The furnace body 5 includes a shell and an electric heating element 51 located inside the shell. The electric heating element 51 extends into the shell through a connection hole 23 on the wiring chamber 2. Vent vents 24 are provided on the side wall of the shell that connects to the wiring chamber 2.

[0047] For example, the wiring chamber 2 is the cavity where the external power cord 21 connects to the furnace body 5. The heating element is not limited to one or more combinations of resistance wire, resistance strip, inductor coil, or heating rod. It is connected to the furnace body 5 through one or more gas phase interfaces 22 to achieve the input and uniform distribution of explosion-proof gas. The gas phase interfaces 22 can be located on the front or side. The other side of the wiring chamber 2 is connected to the furnace body 5. On this side, the heating element inside the furnace body 5 extends into the furnace body 5 through the connection hole 23 of the wiring chamber 2. A gap of 1mm to 50mm is left between the heating element and the outer edge of the connection hole 23, and this gap can be filled with insulating materials such as ceramic, mica, or corundum. Simultaneously, several vents 24 are opened on this side, through which explosion-proof gas enters the furnace body 5 from the wiring chamber 2. The specific shape of the wiring chamber 2 (which can be square, round, or elliptical, etc.) needs to be adapted according to the outer shell of the furnace body 5 and the wiring scheme of the electric heating element 51. Due to the flow of explosion-proof gas in wiring compartment 2, the overall temperature is lower, thus reducing the requirements for sealing materials at the power inlet. On the side connected to furnace body 5, since explosion-proof gas needs to enter from this side, no seal is required between electrical components and connection hole 23; only insulation design is needed. Please refer to... Figure 2 Furnace tubes 52 can also be installed inside the furnace body 5.

[0048] The pressure control module 3 is used to regulate the internal pressure of the electric heating furnace. The pressure control module 3 includes a cooler 36, a second oxygen detector 35, a combustible gas detector 34, a second pressure gauge 31, a pressure regulating valve 32, and a pressure relief valve 33. The cooler 36 is used to cool the explosion-proof gas discharged from the furnace body 5. The second oxygen detector 35 is used to detect the oxygen content in the explosion-proof gas. The combustible gas detector 34 is used to detect the content of combustible gas in the explosion-proof gas. The second pressure gauge 31 is used to measure the pressure of the explosion-proof gas. The pressure regulating valve 32 is used to adjust the internal pressure of the electric heating furnace. The pressure relief valve 33 is used to reduce the internal pressure of the electric heating furnace.

[0049] For example, the pressure control module 3 can maintain positive pressure in spaces such as the wiring chamber 2 and the interior of the furnace body 5 where sparks may occur or where there are high-temperature surfaces, preventing the entry of oxygen-containing gases and ensuring the safe operation of the electric heating furnace. After the explosion-proof gas exiting the furnace body 5 enters the pressure control module 3, it first enters the cooler 36 for cooling; the cooling method is not limited to air cooling or liquid cooling. Then, after being detected by the combustible gas detector 34 and the second oxygen detector 35, the explosion-proof gas enters the pressure control mechanism composed of the second pressure gauge 31 and the pressure regulating valve 32 for control, ensuring that the entire electric heating furnace is under positive pressure. After exiting the pressure control module 3, the explosion-proof gas enters the explosion-proof gas circulation module 4.

[0050] The explosion-proof gas circulation module 4 is used to send the explosion-proof gas discharged from the electric heating furnace into the explosion-proof gas input module 1.

[0051] For example, the explosion-proof gas circulation module 4 is equipped with an explosion-proof gas circulation device 41 (which may be a fan or a compressor), an emergency shut-off valve 42, and corresponding pipelines. Its main function is to provide kinetic energy for the circulation of explosion-proof gas. After the explosion-proof gas exits the pressure control module 3, it enters the explosion-proof gas circulation module 4. After the pressure is increased by the explosion-proof gas circulation device 41, it returns to the explosion-proof gas input module 1, thus realizing the circulation of explosion-proof gas.

[0052] In a specific implementation case, the furnace body 5 adopts tubular heating, the explosion-proof gas is nitrogen, the process medium is heated in the heating tube, and the heat is provided by the resistance wire to achieve an internal working temperature of 500℃, a working pressure of 10Pa, and an internal volume of 200m³.

[0053] Before opening furnace body 5, the explosion-proof function of this electric heating furnace should be activated first. For example... Figure 1As shown, firstly, the shut-off valve 16 is opened, and explosion-proof gas (oxygen content below 0.1%, pressure 0.3 MPa, room temperature) that has passed the oxygen detector test is introduced from outside. If the first oxygen detector 11 detects an oxygen content exceeding 0.1%, the shut-off valve 16 is closed. The qualified nitrogen gas first purifies the explosion-proof gas input module 1, wiring chamber 2, pressure control module 3, explosion-proof gas circulation module 4, and the internal space of the furnace body 5 until the oxygen detector tests qualified. Then, the emergency shut-off valve 42 is closed, and the explosion-proof gas circulation module 4 is started to achieve internal nitrogen circulation. Only then can the furnace body 5 be started.

[0054] After nitrogen enters the explosion-proof gas input module 1, it passes through thermometer 12, first pressure gauge 13, and flow meter 14 in sequence to measure its temperature, pressure, and flow rate. At the same time, the temperature and pressure measurement data are input into flow meter 14 for temperature and pressure compensation correction to ensure the accuracy of the flow meter 14. Then, the flow rate is adjusted to 10 m³ / h by flow regulating valve 15, and enters wiring chamber 2 after passing through shut-off valve 16.

[0055] like Figure 3 As shown, inside the wiring compartment 2, the external power supply line 21 is connected to the heating element, and nitrogen gas is supplied through six evenly distributed gas phase interfaces 22 (see...). Figure 4 The flow of nitrogen gas into the wiring chamber 2 effectively reduces its temperature, simplifying the sealing process at the power inlet. On the other side of the wiring chamber 2, which connects to the furnace body 5, there are 54 2mm vent holes 24 and 2 connection holes 23. Nitrogen gas enters the furnace body 5 through the gaps between the vent holes 24 and the connection holes 23. Since the wiring chamber 2 and the furnace body 5 are internally connected, no sealing is required between the electrical components and the furnace body 5; only insulation is necessary. The electric heating element 51 extends into the furnace body 5 through the connection holes 23, maintaining a 3mm gap between the heating element and the connection holes 23. Ceramic components are provided for support and insulation. The electric heating element 51 is located on both sides of the furnace tube 52, providing heat to the furnace tube 52 and the medium inside.

[0056] The nitrogen gas exiting the furnace body 5 has a temperature of 500℃. After entering the pressure control module 3, it first enters the cooler 36 to cool down to room temperature, and then enters the combustible gas detector 34 and the second oxygen detector 35 for detection. Then, the control mechanism composed of the second pressure gauge 31 and the pressure regulating valve 32 controls the pressure to ensure that the pressure inside the heating furnace is controlled at 10Pa.

[0057] After exiting the nitrogen pressure control module 3, the nitrogen enters the explosion-proof gas circulation module 4. The explosion-proof gas circulation device 41 pressurizes the nitrogen to 0.3 MPa, after which it returns to the explosion-proof gas input module 1, thus completing the nitrogen circulation process.

[0058] If the pressure inside the electric heating furnace exceeds the control value of 10Pa, or if the combustible gas detector 34 detects combustible gas and the second oxygen detector 35 detects that the oxygen content exceeds the limit, then the emergency shut-off valve 42 will close, the emergency relief valve will open, and the explosion-proof gas circulation module 4 will stop working, the explosion-proof gas circulation module 4 will stop working, the shut-off valve 16 will open, and nitrogen will be input from the outside.

[0059] Figure 5 This application discloses an explosion-proof method for an electric heating furnace, comprising: Step S501: Monitor the parameters of the explosion-proof gas in the explosion-proof gas input module to obtain the first explosion-proof gas parameters, which include the input temperature, input pressure, input flow rate and oxygen content.

[0060] The input temperature refers to the temperature of the explosion-proof gas entering the explosion-proof gas input module. For example, the input temperature can be measured by a temperature sensor installed on the pipe wall.

[0061] Input pressure refers to the static pressure of the explosion-proof gas within the pipeline. Input flow rate refers to the volume of explosion-proof gas flowing into the explosion-proof gas input module per unit time.

[0062] Step S502: Based on the input temperature and input pressure, compensate and correct the input flow rate to obtain the actual flow rate.

[0063] Temperature and pressure compensation correction is a technique in flow metering that involves converting the volumetric flow rate measured by the flow meter under operating conditions to the actual flow rate under standard conditions (e.g., 25℃, 101.325 kPa) based on the actual temperature and pressure of the fluid, thereby eliminating measurement errors caused by changes in fluid density. The actual flow rate refers to the value obtained after temperature and pressure compensation correction, reflecting the true flow rate under standard conditions.

[0064] The algorithm used for compensation and correction can be set by technicians according to actual needs, and this application embodiment will not elaborate on it in detail.

[0065] Step S503: Adjust the opening of the flow regulating valve according to the difference between the actual flow rate and the preset flow rate, so that the difference is less than the preset difference threshold.

[0066] The preset flow rate is a target flow rate value set in advance based on process parameters such as the volume, power, and explosion-proof requirements of the electric heating furnace.

[0067] For example, suppose the preset flow rate required for the operation of the electric heating furnace is 10.0 m³ / h, and the preset difference threshold is ±0.2 m³ / h. The calculated actual flow rate is 10.5 m³ / h, which differs from the preset value by +0.5 m³ / h, exceeding the 0.2 m³ / h threshold. A command to reduce the flow rate is then issued to the flow regulating valve. For example, using a PID algorithm, the valve opening is reduced from 60% to 55%. After adjustment, monitoring is repeated until the actual flow rate stabilizes within the range of 10.0 ± 0.2 m³ / h.

[0068] Step S504: Monitor the parameters of the explosion-proof gas in the pressure control module to obtain the second explosion-proof gas parameters. The second explosion-proof gas parameters include the output pressure and the output gas parameters, which include the combustible gas content and the oxygen content.

[0069] Output pressure refers to the pressure of the explosion-proof gas at the inlet of the pressure control module. Combustible gas content refers to the concentration of combustible gas (e.g., hydrocarbons) within the explosion-proof gas at the inlet of the pressure control module. Oxygen content refers to the concentration of oxygen within the explosion-proof gas at the inlet of the pressure control module.

[0070] Step S505: If the output pressure is greater than the preset pressure threshold, or the combustible gas content is greater than the first preset content, or the oxygen content is greater than the second preset content, then open the pressure relief valve and close the emergency shut-off valve in the explosion-proof gas circulation module.

[0071] The preset pressure threshold refers to the highest permissible pressure limit set to ensure the electric heating furnace is under a slight positive pressure and to prevent outside air from seeping in. The first preset content refers to the safe upper limit of the concentration of combustible gas in the explosion-proof gas. The second preset content refers to the safe upper limit of the concentration of oxygen in the explosion-proof gas.

[0072] When the output pressure exceeds the preset pressure threshold, it indicates that the internal pressure of the entire electric heating furnace is too high. Continuing to operate may damage the entire electric heating furnace. It is necessary to open the pressure relief valve and close the shut-off valve in the explosion-proof gas circulation module to quickly discharge the explosion-proof gas in the electric heating furnace.

[0073] When the content of combustible gas exceeds the first preset content, it indicates that there is a leak of combustible gas inside the electric heating furnace, which needs to be shut off in time to prevent the combustible gas leak from causing greater danger.

[0074] When the oxygen content exceeds the second preset level, it needs to be shut off in time to prevent the excessively oxygenated gas from circulating in the high-temperature area.

[0075] Step S506: If the output pressure is not greater than the preset pressure threshold, the combustible gas content is not greater than the first preset content, and the oxygen content is not greater than the second preset content, then keep the explosion-proof gas circulation module in the open state.

[0076] By adopting the above technical solution, the flow rate of the input gas is monitored and compensated in real time to ensure that the actual flow rate entering the equipment accurately meets the preset requirements, thus guaranteeing the basic protection effect. Simultaneously, the pressure, combustible gas content, and oxygen content of the circulating gas are continuously monitored, and clear linkage control logic is set. When any safety parameter exceeds the standard, it can automatically trigger pressure relief and cut off circulation; otherwise, it maintains circulation operation. This achieves multiple, automatic safety monitoring and rapid emergency response during the operation of the electric heating furnace, improving the overall proactiveness and intelligence level of explosion protection.

[0077] In the following embodiments, before turning on the electric heating furnace, it is necessary to ensure that there is no oxygen or combustible gas remaining in it. Figure 6 This application discloses a pre-start method for an electric heating furnace, which includes: Step S601: Open the shut-off valve and open the pressure relief valve.

[0078] It should be noted that this embodiment needs to be executed before the electric heating furnace is turned on, so as to pre-explode the combustible gas and oxygen in the entire electric heating furnace.

[0079] Step S602: When the oxygen content of the external explosion-proof gas is less than the third preset content, explosion-proof gas is introduced into the electric heating furnace, wherein the explosion-proof gas passes through the explosion-proof gas input module, the wiring chamber, the furnace body, the pressure control module and the explosion-proof gas circulation module in sequence.

[0080] External explosion-proof gas refers to explosion-proof gas from an external gas source of the electric heating furnace. For example, external explosion-proof gas can come from nitrogen generators, gas storage tanks, pipelines, etc.

[0081] The third preset content refers to the safety threshold set for the oxygen content in the external explosion-proof gas. Only when the oxygen content of the gas source is below this threshold is it permitted to be introduced into the electric heating furnace to prevent the introduction of substandard high-oxygen gas.

[0082] Step S603: When the oxygen content is less than the fourth preset content, close the pressure relief valve.

[0083] The fourth preset content is a safe operating threshold set for the oxygen content in the internal explosion-proof gas. The electric furnace is considered to have been sufficiently purged and reached a safe state only when the oxygen content in the explosion-proof gas is consistently below this threshold. The fourth preset content is typically lower than the third preset content to ensure the overall explosion-proof performance of the electric furnace.

[0084] By adopting the above technical solution, with the input valve open and the pressure relief valve in operation, the external gas is first confirmed to be qualified before the explosion-proof gas is introduced into the electric heating furnace. A specific oxygen content standard is set to close the pressure relief valve. This process ensures that during the start-up and gas-charging phase of the electric heating furnace, the existing air is first eliminated, and a qualified explosion-proof gas environment with extremely low oxygen content is gradually established. This lays the foundation for the safe operation of the electric heating furnace subsequently and avoids potential risks during the start-up phase.

[0085] Figure 7 This application discloses a second method for pre-starting an electric heating furnace, which includes: Step S701: When introducing explosion-proof gas into the electric heating furnace, close the exhaust passage between the electric heating furnace and the pressure control module.

[0086] The exhaust channel refers to the gas outflow passage between the heating chamber and the pressure control module of the electric heating furnace.

[0087] Step S702: Obtain the pressure inside the furnace body to get the internal pressure of the equipment.

[0088] The internal pressure of the equipment refers to the real-time gas pressure inside the heating chamber of the electric heating furnace. The internal pressure of the equipment can be measured by a pressure sensor installed on the furnace body.

[0089] Step S703: Execute the opening step, which includes opening the exhaust channel when the internal pressure of the device is greater than the first preset exhaust pressure.

[0090] The first preset exhaust pressure is the upper limit of the pressure set to trigger the exhaust action. When the internal pressure of the equipment reaches this value, it indicates that sufficient gas has been filled in, and the exhaust can be started to form flow and perform displacement.

[0091] Step S704: Perform the recording step, which includes recording the oxygen content and obtaining a set of oxygen contents.

[0092] The oxygen content set specifically refers to the oxygen concentration value measured in real time by a second oxygen detector located downstream of the exhaust channel or at the inlet of the pressure control module during the period when the exhaust channel is open and gas flow is occurring. This value reflects the quality of the exhaust gas, that is, the oxygen level of the local gas displaced within the furnace.

[0093] Step S705: Perform the shutdown step, which includes closing the exhaust channel when the internal pressure of the device is less than the second preset exhaust pressure, and the second preset exhaust pressure is less than the first preset exhaust pressure.

[0094] The second preset exhaust pressure is the lower limit of the pressure set to stop exhaust and start the next round of pressure increase. When the internal pressure of the equipment drops to this value due to exhaust, the exhaust passage is closed. This value must be less than the first preset exhaust pressure to form a pressure range (hysteresis range) and prevent frequent valve operation.

[0095] Step S706: Perform the value retrieval step, which includes retrieving the maximum value from the oxygen content set to obtain the maximum oxygen content.

[0096] The maximum oxygen content refers to the highest oxygen content reading taken from the set of oxygen content records from one pressurization-exhaust cycle. This value represents the portion of the gas that was displaced in that cycle with the highest oxygen concentration, reflecting the limit of improvement that this round of displacement can achieve in the worst areas of the furnace (i.e., the most difficult areas to displace and the dead zones where oxygen residue may be the most).

[0097] Step S707: Repeat the start-up step, record step, stop-down step and value retrieval step until the maximum oxygen content is less than the fourth preset content.

[0098] The fourth preset content refers to the target value that needs to be achieved throughout the entire replacement process. When the maximum oxygen content calculated in a certain cycle is lower than this value, it is determined that the oxygen level in the entire furnace space has fully met the standard.

[0099] By employing the above technical solution, dynamic flow conditions are created through intermittent opening / closing of the exhaust channel combined with internal pressure threshold control to efficiently replace gas in dead zones inside the equipment. Simultaneously, the oxygen content during each exhaust is recorded, and the maximum value is used as an indicator for iterative replacement. This method ensures that the oxygen content throughout the electric heating furnace is effectively reduced and ultimately reaches safety standards, improving the thoroughness and reliability of the replacement process.

[0100] Figure 8 This application discloses a method for opening an exhaust passage, which includes: Step S801: Based on the spatial projection of the electric heating element on the exhaust channel, the exhaust channel is divided into several exhaust channel subsets.

[0101] Spatial projection refers to projecting an electric heating element in three-dimensional space onto a two-dimensional plane containing the exhaust channel along a direction from the wiring chamber to the center of the heating chamber. This projection area reflects the range of influence of the heating element on the exhaust port plane.

[0102] For example, exhaust channels located within the same projection are grouped into the same subset of exhaust channels.

[0103] Step S802: Set the arrangement order of the exhaust channel subsets according to their location distribution, wherein the distance between adjacent exhaust channels in the real space is greater than a preset distance.

[0104] For example, suppose the exhaust channel subset includes A, B, C, and D. If the order is A, B, C, D, calculation shows that the center distance between subsets A and B is only 20cm (less than the preset distance of 50cm), which does not meet the requirements. Therefore, the subsets are rearranged to generate a compliant order, such as A, C, B, D. Verification: The center distance between A and C is 80cm > 50cm; the center distance between C and B is 60cm > 50cm; the center distance between B and D is 75cm > 50cm. This order satisfies the principle that adjacent subsets have a large spatial distance.

[0105] Step S803: Open the exhaust channels in sequence according to the arrangement order.

[0106] By adopting the above technical solution, the channels are divided according to the spatial projection of the electric heating element and the opening sequence is set to ensure that adjacent exhaust channels in space do not open at the same time. This orderly and spaced opening method helps the explosion-proof gas to form a more uniform and stable flow field in the heating chamber, avoiding local airflow short circuits or disturbances caused by the simultaneous opening of multiple adjacent exhaust ports, thereby improving the uniformity of gas replacement and overall efficiency.

[0107] Figure 9 This application discloses a gas replacement method for an electric heating furnace, comprising: Step S901: After each round of repetition, determine the target oxygen content in the oxygen content set that is greater than the fifth preset content.

[0108] The fifth preset content is a set oxygen concentration screening threshold, typically between the initial concentration and the fourth preset content. It is used to filter out readings from the set of oxygen concentrations that are still significantly high and require close monitoring.

[0109] Step S902: Determine the exhaust channel corresponding to the target oxygen content to obtain the target exhaust channel.

[0110] The target exhaust channel refers to the exhaust channel that opens when the target oxygen content is detected.

[0111] Step S903: Open the target exhaust passage and close all other exhaust passages except the target exhaust passage.

[0112] In this step, only the designated target exhaust passage is opened, while all other exhaust passages remain closed. This will concentrate the majority of the intake airflow flowing out from these specific outlets.

[0113] Step S904: Adjust the opening of the flow regulating valve according to the preset flow rate so that the flow rate entering the furnace body is the preset flow rate.

[0114] The preset flow rate refers to the explosion-proof gas input flow rate specifically set for the current targeted purging mode. When only a few exhaust channels are open, the flow resistance of the electric heating furnace increases, and maintaining the original total air intake flow rate may cause the furnace pressure to rise too quickly. Therefore, this preset flow rate is usually smaller than the flow rate setting when all channels are open. Its specific value can be calculated based on the total flow area of ​​the target exhaust channels, the required airflow velocity, etc., or set empirically.

[0115] By employing the above technical solution, after each replacement cycle, the system can accurately locate target exhaust channels where the oxygen concentration still exceeds the safety threshold based on recorded oxygen content data. By opening only these specific channels and adjusting the input flow rate to a preset value, the airflow can be concentrated for targeted and intensified replacement of these high-oxygen areas. This significantly improves purging efficiency and reduces the consumption of explosion-proof gas.

[0116] Figure 10 This application discloses a method for determining a target exhaust channel, the method comprising: Step S1001: If the number of target exhaust channels is greater than the preset number, calculate the current concentration of the target exhaust channels.

[0117] The current clustering degree is used to assess the degree of concentration or dispersion of the target exhaust channels in the furnace space. It can be calculated based on the spatial standard deviation and mean nearest neighbor distance of all target channel coordinates.

[0118] Step S1002: If the current clustering degree is greater than the preset clustering degree, then cluster the target exhaust channels to obtain channel clusters.

[0119] For example, after performing cluster analysis on the spatial coordinates of the target exhaust channels, several channel groups are obtained. Channels within each cluster are spatially close to each other, while channels between different clusters are far apart. The clustering process can be based on Euclidean distance-based K-means clustering or DBSCAN density clustering algorithms.

[0120] Step S1003: Take the largest channel cluster in the channel clusters.

[0121] Step S1004: Select the exhaust channels within the largest channel cluster as the target exhaust channels.

[0122] After performing cluster analysis, the cluster containing the most channels is selected from the resulting multiple channel clusters. This strategy assumes that the largest cluster represents the most spatially significant and extensive hyperoxygen region, and should be prioritized for resource processing.

[0123] Step S1005: If the current aggregation degree is not greater than the preset aggregation degree, then set all exhaust channels as target exhaust channels.

[0124] By employing the above technical solution, when there are a large number of target channels, their spatial clustering is calculated. If the clustering is too high, cluster analysis is performed, and only the channels within the largest cluster are selected as the final targets. This avoids the problem of airflow dispersion and reduced replacement effect caused by overly dispersed target channels. This strategy can intelligently and dynamically optimize airflow resource allocation based on the distribution of hyperoxygen regions, ensuring efficient and focused replacement operations even under complex conditions.

[0125] Figure 11 This application discloses a method for adjusting system parameters, which includes: Step S1101: Obtain the current system parameters.

[0126] Current system parameters refer to the set of physical quantities of the electric heating furnace during the current operating cycle. For example, current system parameters include, but are not limited to, the stable input flow rate of explosion-proof gas, the average input pressure, the average input temperature, the average internal pressure of the heating chamber, the temperature distribution uniformity index, the stable temperature, the operating current, and the average valve opening.

[0127] Step S1102: Extract historical system parameters from historical operation records.

[0128] Historical operation records refer to historical operation datasets stored in the system database or cloud. Optionally, the source should be data recorded by the electric heating furnace's control system during an operating period after it has passed factory commissioning or after the last repair and has been confirmed to be in optimal operating condition.

[0129] The types of historical system parameters are the same as those of the current system parameters, so they will not be repeated here.

[0130] Step S1103: Calculate the difference between the current system parameters and the historical system parameters to obtain the system parameter difference.

[0131] System parameter difference refers to the difference between the current system parameters and the historical system parameters. It can represent the deviation of the entire electric heating furnace during the current operating cycle.

[0132] Step S1104: If the difference in system parameters is greater than the preset difference threshold, the current system parameters are adjusted with reference to the historical system parameters.

[0133] Preset difference threshold: The allowable deviation limit set for each system parameter. This threshold is determined based on the importance of the parameter and its normal drift range. Adjustment is triggered when the absolute value of the deviation of any parameter exceeds its corresponding threshold. For example, the threshold for critical parameters such as furnace pressure is set to ±10%, and the threshold for minor parameters such as input temperature is set to ±15%.

[0134] By adopting the above technical solution, the current operating parameters are compared with historical normal parameters. When the deviation exceeds the threshold, the current parameters can be automatically adjusted based on historical data. This helps the electric heating furnace adapt to the possible performance degradation of components or slow changes in operating conditions during long-term operation, enabling its operating state to actively approach the historical optimal state. This maintains the long-term, stable, high-performance explosion-proof effect of the electric heating furnace and provides a certain degree of fault warning and adaptive adjustment capability.

[0135] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0136] This application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed as an explosion-proof method for an electric heating furnace.

[0137] Computer storage media include, for example, USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media that can store program code.

[0138] Based on the same inventive concept, embodiments of this application provide a smart terminal, including a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed for an explosion-proof method of an electric heating furnace.

[0139] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0140] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. An electric heating furnace with explosion-proof function, characterized in that, The furnace includes an explosion-proof gas input module (1), a wiring chamber (2), a pressure control module (3), an explosion-proof gas circulation module (4), and a furnace body (5). The wiring chamber (2) includes an external power cord (21) and a gas phase interface (22). The furnace body (5) includes a shell and an electric heating element (51) located inside the shell. The electric heating element (51) extends into the shell through a connection hole (23) on the wiring chamber (2). A vent (24) is provided on the side wall of the shell that connects to the wiring chamber (2). The explosion-proof gas input module (1) includes a first oxygen detector (11), a flow regulating valve (15) and a shut-off valve (16). The explosion-proof gas input module (1) is used to introduce explosion-proof gas into the wiring chamber (2). The wiring chamber (2) is used to transfer explosion-proof gas to the furnace body (5); wherein, the explosion-proof gas enters the wiring chamber (2) through the gas phase interface (22), then enters the furnace body (5) through the gas hole (24), and then enters the pressure control module (3). The pressure control module (3) includes a cooler (36), a second oxygen detector (35), a combustible gas detector (34), a pressure regulating valve (32), and a pressure relief valve (33). The pressure control module (3) is used to regulate the internal pressure of the electric heating furnace. The explosion-proof gas circulation module (4) includes an explosion-proof gas circulation device (41) and an emergency shut-off valve (42). The explosion-proof gas circulation module (4) is used to send the explosion-proof gas discharged from the pressure control module (3) into the explosion-proof gas input module (1).

2. The electric heating furnace with explosion-proof function according to claim 1, characterized in that, The explosion-proof gas input module (1) also includes a thermometer (12), a first pressure gauge (13), and a flow meter (14). The first oxygen detector (11) is used to detect the oxygen content in the explosion-proof gas; the thermometer (12) is used to measure the temperature of the explosion-proof gas; the first pressure gauge (13) is used to measure the pressure of the explosion-proof gas; the flow meter (14) is used to measure the flow rate of the explosion-proof gas; the flow regulating valve (15) is used to regulate the flow rate of the explosion-proof gas entering the furnace body (5); and the shut-off valve (16) is used to control the on / off of the explosion-proof gas entering the furnace body (5).

3. The electric heating furnace with explosion-proof function according to claim 1, characterized in that, The pressure control module (3) also includes a second pressure gauge (31); The cooler (36) is used to cool the explosion-proof gas discharged from the furnace body (5); the second oxygen detector (35) is used to detect the oxygen content in the explosion-proof gas; the combustible gas detector (34) is used to detect the content of combustible gas in the explosion-proof gas; the second pressure gauge (31) is used to measure the pressure of the explosion-proof gas; the pressure regulating valve (32) is used to adjust the internal pressure of the electric heating furnace; and the pressure relief valve (33) is used to reduce the internal pressure of the electric heating furnace.

4. An explosion-proof method for an electric heating furnace, characterized in that, The method is performed by an electric heating furnace with explosion-proof function as described in claim 1, comprising: Monitor the parameters of the explosion-proof gas in the explosion-proof gas input module (1) to obtain the first explosion-proof gas parameters, which include the input temperature, input pressure, input flow rate and oxygen content; The input flow rate is compensated and corrected based on the input temperature and the input pressure to obtain the actual flow rate; Based on the difference between the actual flow rate and the preset flow rate, adjust the opening of the flow regulating valve (15) so that the difference is less than the preset difference threshold. Monitor the parameters of the explosion-proof gas in the pressure control module (3) to obtain the second explosion-proof gas parameters. The second explosion-proof gas parameters include the output pressure and the output gas parameters, which include the combustible gas content and the oxygen content. If the output pressure is greater than the preset pressure threshold, or the combustible gas content is greater than the first preset content, or the oxygen content is greater than the second preset content, then the pressure relief valve (33) is opened and the emergency shut-off valve (42) in the explosion-proof gas circulation module (4) is closed. If the output pressure is not greater than the preset pressure threshold, the combustible gas content is not greater than the first preset content, and the oxygen content is not greater than the second preset content, then the explosion-proof gas circulation module (4) is kept in the open state.

5. The explosion-proof method for the electric heating furnace according to claim 4, characterized in that, The method further includes: Open the shut-off valve (16) and open the pressure relief valve (33); When the oxygen content of the external explosion-proof gas is less than the third preset content, explosion-proof gas is introduced into the electric heating furnace; wherein, the explosion-proof gas passes through the explosion-proof gas input module (1), the wiring chamber (2), the furnace body (5), the pressure control module (3) and the explosion-proof gas circulation module (4) in sequence. If the oxygen content is less than the fourth preset content, close the pressure relief valve (33).

6. The explosion-proof method for an electric heating furnace according to claim 5, characterized in that, The method further includes: When introducing explosion-proof gas into the electric heating furnace, close the exhaust channel between the furnace body (5) and the pressure control module (3); Obtain the pressure inside the furnace body (5) to obtain the internal pressure of the equipment; The opening step includes opening the exhaust passage when the internal pressure of the device is greater than the first preset exhaust pressure. Perform a recording step, the recording step including recording the oxygen content to obtain an oxygen content set; Perform a shutdown step, the shutdown step including closing the exhaust passage when the internal pressure of the device is less than the second preset exhaust pressure, the second preset exhaust pressure being less than the first preset exhaust pressure; The value retrieval step includes retrieving the maximum value from the set of oxygen contents to obtain the maximum oxygen content. Repeat the opening step, the recording step, the closing step, and the value retrieval step until the maximum oxygen content is less than the fourth preset content.

7. The explosion-proof method for an electric heating furnace according to claim 6, characterized in that, Opening the exhaust passage includes: Based on the spatial projection of the electric heating element (51) on the exhaust channel, the exhaust channel is divided into several subsets of exhaust channels; According to the location distribution of the exhaust channel subset, the arrangement order of the exhaust channel subset is set, wherein the distance between adjacent exhaust channels in the real space is greater than a preset distance in the arrangement order; The exhaust channels are opened sequentially according to the stated arrangement.

8. The explosion-proof method for an electric heating furnace according to claim 6, characterized in that, The method further includes: After each repetition, a target oxygen content greater than a fifth preset content is determined from the set of oxygen contents; Determine the exhaust channel corresponding to the target oxygen content to obtain the target exhaust channel; Open the target exhaust passage and close all other exhaust passages except the target exhaust passage; Adjust the opening of the flow regulating valve (15) according to the preset flow rate so that the flow rate entering the furnace body (5) is the preset flow rate.

9. The explosion-proof method for an electric heating furnace according to claim 8, characterized in that, The method further includes: If the number of target exhaust channels is greater than a preset number, calculate the current concentration of the target exhaust channels; If the current clustering degree is greater than the preset clustering degree, then the target exhaust channel is clustered to obtain a channel cluster; the largest channel cluster in the channel cluster is selected; and the exhaust channel in the largest channel cluster is taken as the target exhaust channel. If the current aggregation degree is not greater than the preset aggregation degree, then all exhaust channels are set as the target exhaust channels.

10. The explosion-proof method for an electric heating furnace according to claim 4, characterized in that, The method further includes: Get current system parameters; Extract historical system parameters from historical operation records; Calculate the difference between the current system parameters and the historical system parameters to obtain the system parameter difference; If the difference in the system parameters is greater than a preset difference threshold, the current system parameters are adjusted with reference to the historical system parameters.

Images