High-power direct-current power supply heating system for hydrogenation furnace

Abstract

The invention discloses a high-power direct-current power supply heating system for a hydrogenation furnace. Wherein the multiple groups of vertical graphite heaters are sequentially arranged in a furnace body of the hydrogenation furnace from bottom to top, so that the inner wall of the furnace body completely covers the graphite heaters; a sensor extending opening is formed in the range, covered by each group of vertical graphite heaters, of the side wall of the furnace body; a low-temperature temperature sensor and a medium-high-temperature temperature sensor in the temperature collection system are respectively mounted at the telescopic end of low-temperature telescopic equipment and the telescopic end of medium-high-temperature telescopic equipment which are mounted on the outer wall of the hydrogenation furnace body; the low-temperature telescopic device drives the low-temperature temperature sensor to extend into or be pulled out of the furnace body through the sensor extending-in opening, and the medium-high-temperature telescopic device drives the medium-high-temperature temperature sensor to extend into or be pulled out of the furnace body through the sensor extending-in opening. High-precision temperature feedback signals are collected through the low-temperature temperature sensor and the medium-high-temperature temperature sensor, and heating power is precisely regulated and controlled in combination with an incremental PID algorithm; and the product quality and the yield are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of configuration of electric heating elements in furnaces that are common to more than one furnace, and in particular relates to a high-power DC power supply heating system for a hydrogenation furnace. Background Art

[0002] The heating performance of hydrogenation furnaces plays a key role in product quality. Traditional hydrogenation furnace heaters generally use thyristors as power switching devices. Although this meets basic heating needs to a certain extent, its inherent defects are becoming increasingly prominent as the industry's requirements for production precision and efficiency continue to increase.

[0003] 1. Low temperature control accuracy: The temperature fluctuation range of traditional heaters usually exceeds ±5°C, which is a large error range for optical material production. The optical material production process is extremely sensitive to temperature. Temperature instability will affect purity and structure, thereby reducing product quality and increasing the defective rate.

[0004] 2. Slow response speed: The response speed of traditional heaters cannot keep up with the production process. When the production process requires rapid temperature adjustment, traditional heaters are slow to respond and cannot make timely adjustments, resulting in a disconnect between the heating process and the process, limiting equipment efficiency.

[0005] 3. Low energy efficiency: The thermal efficiency of traditional heaters is only between 65% and 75%, and a large amount of electricity is wasted on ineffective heat loss. This not only increases the company's energy consumption costs, but also goes against the current concept of energy conservation and environmental protection. Against the backdrop of rising energy prices, high energy consumption has become a major problem for companies in controlling production costs.

[0006] 4. Complex drive circuits and imperfect protection mechanisms: Thyristor drive circuits are complex and require the coordinated operation of multiple discrete components, which increases circuit complexity and failure rates. Furthermore, imperfect protection mechanisms prevent timely and effective equipment protection in the event of abnormal conditions such as overcurrent and overvoltage. This increases the risk of equipment damage, repair costs, and downtime, severely impacting production continuity and stability.

[0007] Therefore, there is an urgent need for a heater that can accurately monitor the temperature in the hydrogenation furnace. Summary of the Invention

[0008] In response to the problems existing in the background technology, the present invention provides a high-power DC power supply heating system for a hydrogenation furnace. The technical solution includes: multiple groups of vertical graphite heaters, and a temperature collection system, a low-temperature expansion device, and a medium- and high-temperature expansion device with the same number of vertical graphite heater groups. The multiple groups of vertical graphite heaters are arranged sequentially from bottom to top within the furnace body of the hydrogenation furnace, so that the inner wall of the furnace body is completely covered by the graphite heaters; each group of vertical graphite heaters has a sensor insertion port within the range of the furnace body side wall covered by the vertical graphite heaters, and the sensor insertion port is installed with the low-temperature expansion device and the medium- and high-temperature expansion device on the outer wall of the hydrogenation furnace body;

[0009] The temperature collection system includes: a start-stop control circuit, a PID algorithm controller, an IGBT DC power supply, a low-temperature temperature sensor and a medium-high temperature temperature sensor. The low-temperature temperature sensor and the medium-high temperature temperature sensor are installed at the retractable end of the low-temperature telescopic device and the retractable end of the medium-high temperature telescopic device respectively;

[0010] The low-temperature expansion device drives the low-temperature temperature sensor to be inserted into or pulled out of the furnace body through the sensor insertion port, and the medium- and high-temperature expansion device drives the medium- and high-temperature temperature sensor to be inserted into or pulled out of the furnace body through the sensor insertion port; the low-temperature temperature sensor, the medium- and high-temperature temperature sensor, the driving device of the low-temperature expansion device and the driving device of the medium- and high-temperature expansion device are all connected to the PID algorithm controller, and the PID algorithm controller reads and calculates the temperature data and compares it with the target temperature data, and converts it into a control signal, which is connected to the corresponding vertical graphite heater through the connected IGBT DC power supply, and the start-stop control circuit is connected to the IGBT DC power supply.

[0011] The control formula of the incremental PID algorithm used in the PID algorithm controller is:

[0012] Δuk=Kp×(ek-ek1)+Ki×ek+Kd×(ek-2ek1+ek2)

[0013] Where Kp is the proportional coefficient, Ki is the integral coefficient, Kd is the differential coefficient, and ek is the k-th temperature deviation. The k-th temperature deviation value ek is obtained from the feedback of the low-temperature sensor or the medium- and high-temperature temperature sensor when it is inserted into the furnace body alone during use.

[0014] ek1 is the kth temperature deviation value of the dynamic feedback value of the medium and high temperature sensor during the process of entering or withdrawing from the furnace body;

[0015] ek2 is the kth temperature deviation value of the dynamic feedback value of the low-temperature temperature sensor during the process of entering or withdrawing from the furnace body;

[0016] Δuk is the control quantity increment calculated for the kth time, and the result calculated by Δuk is fed back to the PID algorithm controller; when the temperature deviation is large, the proportional coefficient Kp is increased to speed up the system response speed so that the temperature can quickly approach the set value; when the temperature approaches the target temperature, the integral coefficient Ki is increased to eliminate the steady-state error and make the temperature more stably maintained at the set value; the differential coefficient Kd is used to suppress temperature overshoot. By monitoring and adjusting the temperature change rate, the system can be more stable during the temperature change process, thereby improving the stability of the system.

[0017] During the heating process, when the theoretical upper limit temperature of the low-temperature temperature sensor is reached, the PID algorithm controller sends a signal to the low-temperature telescopic device to drive the low-temperature temperature sensor to be pulled out; when the theoretical lower limit temperature of the medium and high temperature temperature sensor is reached, the PID algorithm controller sends a signal to the medium and high temperature telescopic device to drive the medium and high temperature temperature sensor to be inserted; during the cooling process, when the theoretical upper limit temperature of the low-temperature temperature sensor is reached, the PID algorithm controller sends a signal to the low-temperature telescopic device to drive the low-temperature temperature sensor to be inserted; when the theoretical lower limit temperature of the medium and high temperature sensor is reached, the PID algorithm controller sends a signal to the medium and high temperature telescopic device to drive the medium and high temperature sensor to be pulled out.

[0018] The deposition area of ​​the furnace body is provided with a monitoring group, and a monitoring sensor opening is opened in the deposition area at the bottom of the hydrogenation furnace body. A low-temperature monitoring telescopic device and a medium-high temperature monitoring telescopic device are installed on the outer wall of the furnace body at the monitoring sensor opening. A low-temperature monitoring temperature sensor and a medium-high temperature monitoring temperature sensor are respectively installed on the telescopic end of the low-temperature monitoring telescopic device and the telescopic end of the medium-high temperature monitoring telescopic device, which are used to detect the target temperature of the key area; the low-temperature monitoring temperature sensor, the medium-high temperature monitoring temperature sensor, the driving device of the low-temperature monitoring telescopic device and the driving device of the medium-high temperature monitoring telescopic device are all connected to the PID algorithm monitoring controller, and the temperature values ​​fed back to the PID algorithm monitoring controller by the low-temperature monitoring temperature sensor and the medium-high temperature monitoring temperature sensor are used for safety monitoring of the system.

[0019] The single-group vertical graphite heater is composed of a ring of multiple circular graphite electrodes arranged in a vertical direction, and the multiple circular graphite electrodes are evenly fixed on the inner wall of the hydrogenation furnace body through brackets.

[0020] The PID control signal output circuit of the PID algorithm controller includes an intelligent temperature controller, the start-stop control circuit includes a relay, a group of buttons and switches, and the temperature detection circuit includes a group of temperature measuring thermocouples; the output end of the IGBT DC power supply is connected to the electrode input end of the vertical graphite heater, the GND and S1 ends of the IGBT DC power supply are connected to the start-stop control circuit, and the C1 and C2 ends of the IGBT DC power supply are connected to the analog signal output end of the PID control signal output circuit.

[0021] The beneficial effects of the present invention are:

[0022] 1. High-precision temperature feedback signals are collected through low-temperature sensors (Pt100) and medium- and high-temperature sensors (WRe5-WRe26), and the heating power is precisely controlled using an incremental PID algorithm. The temperature controller used has high control accuracy and a stable output PID signal. The DC waveform output by the IGBT DC power supply is smooth and dense, with an oscillation frequency of over 10 kHz. This ensures balanced three-phase power supply in the complex environment of multiple sets of special-shaped heaters in the equipment, effectively controlling the temperature fluctuation range within ±1°C, significantly improving the accuracy of temperature control during the production process, thereby enhancing product quality and yield. Compared to the ±5°C temperature fluctuation range of traditional heaters, the high-precision temperature control of the present invention has obvious advantages and can meet the strict temperature stability requirements of optical material production.

[0023] 2. Maintaining optimal matching between the heating system and the load at all times improves energy transmission efficiency. Soft-start technology also avoids inrush current at startup, reducing energy loss. Experimental data shows that the thermal efficiency of this invention can reach 85%-92%, a 10%-15% improvement over the 65%-75% thermal efficiency of conventional heaters. This significantly reduces energy costs for businesses and aligns with the development trend of energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of an embodiment of a high-power DC power supply heating system for a hydrogenation furnace of the present invention.

[0025] Figure 2 This is a schematic diagram of the connection between the IGBT DC heating power supply and its peripheral devices in the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 The embodiment of the present invention shown includes: a hydrogenation furnace body, multiple groups of vertical graphite heaters, and a temperature collection system, a low-temperature expansion device, and a medium- and high-temperature expansion device with the same number of vertical graphite heater groups. The multiple groups of vertical graphite heaters are arranged in sequence from bottom to top in the hydrogenation furnace body, so that the inner wall of the furnace body is completely covered with graphite heaters; a sensor insertion port is opened within the range of the furnace body side wall covered by each group of vertical graphite heaters, and the sensor insertion port is installed with a low-temperature expansion device and a medium- and high-temperature expansion device on the outer wall of the hydrogenation furnace body.

[0028] The temperature collection system includes: a start-stop control circuit, a PID algorithm controller, an IGBT DC power supply, a low-temperature temperature sensor and a medium-high temperature temperature sensor. The low-temperature temperature sensor and the medium-high temperature temperature sensor are respectively installed at the retractable end of the low-temperature telescopic device and the retractable end of the medium-high temperature telescopic device.

[0029] The low-temperature expansion device drives the low-temperature temperature sensor to be inserted into or pulled out of the furnace body through the sensor insertion port, and the medium- and high-temperature expansion device drives the medium- and high-temperature temperature sensor to be inserted into or pulled out of the furnace body through the sensor insertion port; the low-temperature temperature sensor, the medium- and high-temperature temperature sensor, the driving device of the low-temperature expansion device and the driving device of the medium- and high-temperature expansion device are all connected to the PID algorithm controller, and the PID algorithm controller reads and calculates the temperature data and compares it with the target temperature data, and converts it into a control signal, which is connected to the corresponding vertical graphite heater through the connected IGBT DC power supply, and the start-stop control circuit is connected to the IGBT DC power supply.

[0030] In this embodiment, a monitoring group is further provided in the deposition area of ​​the furnace body, and a monitoring sensor opening is opened in the deposition area at the bottom of the hydrogenation furnace body, and a low-temperature monitoring telescopic device and a medium-high temperature monitoring telescopic device are installed on the outer wall of the furnace body at the monitoring sensor opening. A low-temperature monitoring temperature sensor and a medium-high temperature monitoring temperature sensor are respectively installed on the telescopic end of the low-temperature monitoring telescopic device and the telescopic end of the medium-high temperature monitoring telescopic device, which are used to detect the target temperature of the key area; the low-temperature monitoring temperature sensor, the medium-high temperature monitoring temperature sensor, the driving device of the low-temperature monitoring telescopic device and the driving device of the medium-high temperature monitoring telescopic device are all connected to the PID algorithm monitoring controller, and the temperature values ​​fed back to the PID algorithm monitoring controller by the low-temperature monitoring temperature sensor and the medium-high temperature monitoring temperature sensor are used for safety monitoring of the system and are not used for temperature control.

[0031] In this embodiment, a single vertical graphite heater is composed of a ring of multiple circular graphite electrodes arranged in a vertical direction. The multiple circular graphite electrodes are evenly fixed to the inner wall of the hydrogenation furnace body through brackets, thereby uniformly heating the furnace body.

[0032] In this embodiment, there are five groups of vertical graphite heaters, the low-temperature temperature sensor and the low-temperature monitoring temperature sensor both use Pt100, and the medium- and high-temperature temperature sensors and the medium- and high-temperature monitoring temperature sensors both use WRe5-WRe26.

[0033] In this embodiment, the driving device of the low-temperature telescopic device, the driving device of the medium- and high-temperature telescopic device, the driving device of the low-temperature monitoring telescopic device, and the driving device of the medium- and high-temperature monitoring telescopic device are all cylinders, so the telescopic movement is controlled by controlling the opening and closing of the cylinder valves; therefore, the mechanical action of alternating extension and pulling out is completed by the cylinder, and the specific time when the action is triggered is determined by whether the furnace body temperature has reached the theoretical upper limit temperature of the Pt100 temperature sensor and the theoretical lower limit temperature of the WRe5-WRe26 temperature sensor.

[0034] In this embodiment, each sensor inlet is located at a middle height relative to the temperature zone in which it is located.

[0035] During the heating process, when the theoretical upper limit temperature of the low-temperature temperature sensor is reached, the PID algorithm controller sends a signal to the low-temperature telescopic device to drive the low-temperature temperature sensor to be pulled out; when the theoretical lower limit temperature of the medium and high temperature temperature sensor is reached, the PID algorithm controller sends a signal to the medium and high temperature telescopic device to drive the medium and high temperature temperature sensor to be inserted; during the cooling process, when the theoretical upper limit temperature of the low-temperature temperature sensor is reached, the PID algorithm controller sends a signal to the low-temperature telescopic device to drive the low-temperature temperature sensor to be inserted; when the theoretical lower limit temperature of the medium and high temperature sensor is reached, the PID algorithm controller sends a signal to the medium and high temperature telescopic device to drive the medium and high temperature sensor to be pulled out.

[0036] In this embodiment, the theoretical upper limit temperature of the low-temperature temperature sensor and the theoretical lower limit temperature of the medium- and high-temperature temperature sensor overlap to a certain extent. Therefore, there is a time period in which the low-temperature temperature sensor and the medium- and high-temperature temperature sensor are simultaneously extended, so that the temperatures obtained include: the temperature obtained by the low-temperature temperature sensor, the temperature obtained by the medium- and high-temperature temperature sensor, and the temperature obtained by the two sensors together; the PID algorithm controller sends a control signal to the vertical graphite heater in the corresponding area through the IGBT DC power supply according to the calculated control quantity increment to adjust the amount of heating.

[0037] The control formula of the incremental PID algorithm used in the PID algorithm controller is:

[0038] Δuk=Kp×(ek-ek1)+Ki×ek+Kd×(ek-2ek1+ek2)

[0039] Wherein, Kp is the proportional coefficient, Ki is the integral coefficient, Kd is the differential coefficient, and ek is the k-th temperature deviation. The k-th temperature deviation value ek is obtained during use from the feedback when the low-temperature sensor or the medium- and high-temperature temperature sensors are individually inserted into the furnace body, and the weighted value feedback when both temperature sensors are simultaneously inserted into the furnace body.

[0040] During use, ek1 takes the kth temperature deviation value of the dynamic feedback value when the medium and high temperature sensor (WRe5-WRe26 sensor) enters or is pulled out of the furnace body. The feedback value after the medium and high temperature sensor (WRe5-WRe26 sensor) is completely pulled out of the furnace body or fully inserted into the furnace body is not read;

[0041] The value of ek2 is based on the same principle as ek1. It only takes the kth temperature deviation value of the dynamic feedback value when the low-temperature temperature sensor (Pt100 sensor) enters or withdraws from the furnace body. It does not read the feedback value after the low-temperature temperature sensor (Pt100 sensor) is completely withdrawn from the furnace body or fully inserted into the furnace body.

[0042] Δuk is the control quantity increment calculated for the kth time. The result calculated by Δuk is fed back to the PID algorithm controller, allowing the controller to output a 4-20mA linear current signal to control the voltage output conduction angle of the IGBT DC power supply; when the temperature deviation is large, the proportional coefficient Kp is increased to speed up the response speed of the system so that the temperature can quickly approach the set value; when the temperature approaches the target temperature, the integral coefficient Ki is increased to eliminate the steady-state error and make the temperature more stably maintained at the set value; the differential coefficient Kd is used to suppress temperature overshoot, and by monitoring and adjusting the temperature change rate, the system is more stable during the temperature change process, thereby improving the stability of the system; when the low-temperature temperature sensor and the medium- and high-temperature temperature sensor are in the furnace body at the same time, the temperature controller will take the weighted coefficient of the two feedback values ​​and assign it to ek. The weighted assignment process here is consistent with the basic function of the temperature controller.

[0043] In this embodiment, the PID control signal output circuit of the PID algorithm controller includes an intelligent temperature controller, the start-stop control circuit includes a relay, a set of buttons and switches, and the temperature detection circuit includes a set of temperature measuring thermocouples. Figure 2 As shown, the IGBT DC power supply in the present invention is 35kW, and the intelligent temperature controller in the PID control signal output circuit provides the IGBT DC power supply with a voltage output setting 4-20mA analog control signal (connected to the C1 and C2 terminals of the IGBT DC power supply), so that the IGBT DC power supply outputs a controllable, variable and stable DC voltage, where 4mA is fully closed and 20mA is fully open; the output terminal of the IGBT DC power supply is connected to the electrode input terminal of the vertical graphite heater, the GND and S1 terminals of the IGBT DC power supply are connected to the start-stop control circuit, and the C1 and C2 terminals of the IGBT DC power supply are connected to the analog signal output terminal of the PID control signal output circuit.

[0044] The working process of the present invention is:

[0045] The IGBT DC power supply receives the analog control signal transmitted by the temperature controller, so that it outputs a linear variable DC voltage to the corresponding vertical graphite heater to achieve heating of the vertical graphite heater.

[0046] The temperature controller reads the on-site temperature through thermocouples (low-temperature sensor and medium-high-temperature sensor), and adjusts the output size of the analog control signal in real time based on the on-site feedback temperature, thereby achieving precise control of the IGBT DC power supply heating voltage output and forming a closed-loop automatic temperature control structure.

Claims

1. A high-power DC power supply heating system for a hydrogenation furnace, characterized in that: include: Multiple groups of vertical graphite heaters, and the same number of temperature collection systems, low-temperature expansion devices, and medium- and high-temperature expansion devices as the vertical graphite heater groups, wherein the multiple groups of vertical graphite heaters are sequentially arranged in the furnace body of the hydrogenation furnace from bottom to top, so that the inner wall of the furnace body is completely covered by the graphite heaters; a sensor insertion port is opened within the range of the furnace body side wall covered by each group of vertical graphite heaters, and the low-temperature expansion device and medium- and high-temperature expansion device are installed on the outer wall of the hydrogenation furnace body at the sensor insertion port; The temperature collection system includes: a start-stop control circuit, a PID algorithm controller, an IGBT DC power supply, a low-temperature temperature sensor and a medium-high temperature temperature sensor. The low-temperature temperature sensor and the medium-high temperature temperature sensor are installed at the retractable end of the low-temperature telescopic device and the retractable end of the medium-high temperature telescopic device respectively; The low-temperature expansion device drives the low-temperature temperature sensor to be inserted into or pulled out of the furnace body through the sensor insertion port, and the medium- and high-temperature expansion device drives the medium- and high-temperature temperature sensor to be inserted into or pulled out of the furnace body through the sensor insertion port; the low-temperature temperature sensor, the medium- and high-temperature temperature sensor, the driving device of the low-temperature expansion device and the driving device of the medium- and high-temperature expansion device are all connected to the PID algorithm controller, and the PID algorithm controller reads and calculates the temperature data and compares it with the target temperature data, and converts it into a control signal, which is connected to the corresponding vertical graphite heater through the connected IGBT DC power supply, and the start-stop control circuit is connected to the IGBT DC power supply.

2. The high-power DC power supply heating system for a hydrogenation furnace according to claim 1, characterized in that: The control formula of the incremental PID algorithm used in the PID algorithm controller is: Δuk=Kp×(ek-ek1)+Ki×ek+Kd×(ek-2ek1+ek2) Where Kp is the proportional coefficient, Ki is the integral coefficient, Kd is the differential coefficient, and ek is the k-th temperature deviation. The k-th temperature deviation value ek is obtained from the feedback of the low-temperature sensor or the medium- and high-temperature temperature sensor when it is inserted into the furnace body alone during use. ek1 is the kth temperature deviation value of the dynamic feedback value of the medium and high temperature sensor during the process of entering or withdrawing from the furnace body; ek2 is the kth temperature deviation value of the dynamic feedback value of the low-temperature temperature sensor during the process of entering or withdrawing from the furnace body; Δuk is the control quantity increment calculated for the kth time, and the result calculated by Δuk is fed back to the PID algorithm controller; when the temperature deviation is large, the proportional coefficient Kp is increased to speed up the system response speed so that the temperature can quickly approach the set value; when the temperature approaches the target temperature, the integral coefficient Ki is increased to eliminate the steady-state error and make the temperature more stably maintained at the set value; the differential coefficient Kd is used to suppress temperature overshoot. By monitoring and adjusting the temperature change rate, the system can be more stable during the temperature change process, thereby improving the stability of the system.

3. The high-power DC power supply heating system for a hydrogenation furnace according to claim 2, characterized in that: During the heating process, when the theoretical upper limit temperature of the low-temperature temperature sensor is reached, the PID algorithm controller sends a signal to the low-temperature telescopic device to drive the low-temperature temperature sensor to be pulled out; when the theoretical lower limit temperature of the medium and high temperature temperature sensor is reached, the PID algorithm controller sends a signal to the medium and high temperature telescopic device to drive the medium and high temperature temperature sensor to be inserted; during the cooling process, when the theoretical upper limit temperature of the low-temperature temperature sensor is reached, the PID algorithm controller sends a signal to the low-temperature telescopic device to drive the low-temperature temperature sensor to be inserted; when the theoretical lower limit temperature of the medium and high temperature sensor is reached, the PID algorithm controller sends a signal to the medium and high temperature telescopic device to drive the medium and high temperature sensor to be pulled out.

4. The high-power DC power supply heating system for a hydrogenation furnace according to claim 1, characterized in that: The deposition area of ​​the furnace body is provided with a monitoring group, and a monitoring sensor opening is opened in the deposition area at the bottom of the hydrogenation furnace body. A low-temperature monitoring telescopic device and a medium-high temperature monitoring telescopic device are installed on the outer wall of the furnace body at the monitoring sensor opening. A low-temperature monitoring temperature sensor and a medium-high temperature monitoring temperature sensor are respectively installed on the telescopic end of the low-temperature monitoring telescopic device and the telescopic end of the medium-high temperature monitoring telescopic device, which are used to detect the target temperature of the key area; the low-temperature monitoring temperature sensor, the medium-high temperature monitoring temperature sensor, the driving device of the low-temperature monitoring telescopic device and the driving device of the medium-high temperature monitoring telescopic device are all connected to the PID algorithm monitoring controller, and the temperature values ​​fed back to the PID algorithm monitoring controller by the low-temperature monitoring temperature sensor and the medium-high temperature monitoring temperature sensor are used for safety monitoring of the system.

5. The high-power DC power supply heating system for a hydrogenation furnace according to any one of claims 1 to 4, characterized in that: The single-group vertical graphite heater is composed of a ring of multiple circular graphite electrodes arranged in a vertical direction, and the multiple circular graphite electrodes are evenly fixed on the inner wall of the hydrogenation furnace body through brackets.

6. The high-power DC power supply heating system for a hydrogenation furnace according to any one of claims 1 to 3, characterized in that: The PID control signal output circuit of the PID algorithm controller includes an intelligent temperature controller, the start-stop control circuit includes a relay, a group of buttons and switches, and the temperature detection circuit includes a group of temperature measuring thermocouples; the output end of the IGBT DC power supply is connected to the electrode input end of the vertical graphite heater, the GND and S1 ends of the IGBT DC power supply are connected to the start-stop control circuit, and the C1 and C2 ends of the IGBT DC power supply are connected to the analog signal output end of the PID control signal output circuit.

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