A device for detecting and automatically adjusting the brightness of the atmosphere of a carbonization furnace

Abstract

The application discloses a device for detecting and automatically adjusting the brightness of the atmosphere of a carbonization furnace, which comprises a photosensitive resistor, a stabilized DC power supply, a digital voltmeter, a digital ammeter, a voltage dividing resistor, a light emitting diode, a switch and a valve adjusting device; the photosensitive resistor, the stabilized DC power supply, the digital ammeter, the voltage dividing resistor and the light emitting diode form a series loop, and the digital voltmeter is connected in parallel to the high-temperature photosensitive resistor; the photosensitive resistor is arranged at the furnace mouth, the light emitting diode is used for displaying the brightness of the atmosphere of the furnace, the digital ammeter is used for detecting the current value corresponding to the brightness of the atmosphere of the furnace and sending the detected current value to the valve adjusting device, the valve adjusting device converts the detected current value into a standard signal value, and controls the opening degree of the valve according to the signal values of the brightness of the atmosphere of the furnace in different states which are stored, so that the atmosphere state in the furnace reaches a standard state. The application can ensure the stability of the carbon fiber production process.

Description

Technical Field

[0001] This invention belongs to the field of carbon fiber production process control, and in particular, it is a device for detecting and automatically adjusting the brightness of the atmosphere in a carbonization furnace. Background Technology

[0002] In the carbon fiber production process, the carbonization step requires equipment such as oxidation furnaces, low-temperature furnaces, and high-temperature furnaces. The main reactions occurring during carbonization are thermal decomposition and thermal polycondensation, generating large amounts of waste gas and tar that must be discharged instantly; otherwise, they will severely pollute the carbon fiber. Therefore, in the process control of the carbonization step in carbon fiber production, it is crucial to monitor the furnace atmosphere to ensure timely and smooth waste removal. Traditionally, the furnace atmosphere is monitored by visually observing the brightness inside the furnace from the furnace opening (furnace head, furnace tail), making a qualitative judgment of the atmosphere. However, due to the untimely nature and individual differences of visual observation, the furnace atmosphere cannot be observed accurately and promptly. This can easily lead to deviations in furnace atmosphere control and waste gas emissions from process requirements. Excessive brightness inside the furnace results in poor waste removal, while excessive brightness leads to an overly large waste removal opening, posing a risk of oxygen ingress and directly affecting the stability of the finished carbon fiber product quality. Summary of the Invention

[0003] The purpose of this invention is to provide a device for detecting and automatically adjusting the brightness of the atmosphere in a carbonization furnace, so as to standardize the judgment criteria for the brightness of the atmosphere in low and high temperature furnaces. Based on this judgment, corresponding electrical signals are transmitted to automatically adjust the waste discharge system, thereby realizing the adjustment of the atmosphere state in low and high temperature furnaces during carbon fiber production, ensuring the performance and quality of finished carbon fiber and the stability of the carbon fiber production process.

[0004] The technical solution to achieve the purpose of this invention is as follows:

[0005] A device for detecting and automatically adjusting the brightness of the atmosphere in a carbonization furnace includes a photoresistor, a regulated DC power supply, a digital voltmeter, a digital ammeter, a voltage divider resistor, a light-emitting diode, a switch, and a valve regulating device.

[0006] The photoresistor, regulated DC power supply, digital ammeter, voltage divider resistor, light-emitting diode, and switch form a series circuit, and the digital voltmeter is connected in parallel with the high-temperature photoresistor.

[0007] The photoresistor is installed at the furnace opening, the light-emitting diode is used to display the furnace atmosphere brightness, the digital ammeter is used to detect the current value corresponding to the furnace atmosphere brightness, and sends the detected current value to the valve regulating device. The valve regulating device converts the detected current value into a standard signal value, and controls the valve opening according to the stored furnace atmosphere brightness signal values ​​under different states, so that the atmosphere state in the furnace reaches the standard state.

[0008] The significant advantages of this invention compared to existing technologies are:

[0009] This invention transforms the abstract concept of brightness into intuitive digital readings, which are then transmitted via electrical signals to achieve automatic adjustment. This invention standardizes the criteria for judging the brightness of the atmosphere inside low- and high-temperature furnaces. Based on this judgment, corresponding electrical signals are transmitted to automatically adjust the waste discharge system, thereby achieving the adjustment of the atmosphere state inside low- and high-temperature furnaces during carbon fiber production, ensuring the performance and quality of finished carbon fiber and the stability of the carbon fiber production process. Attached Figure Description

[0010] Figure 1 This is a circuit diagram of the detection section in a device used to detect and automatically adjust the brightness of the atmosphere in a carbonization furnace.

[0011] Figure 2 This is an installation diagram of the detection section in a device used to detect and automatically adjust the brightness of the atmosphere in a carbonization furnace.

[0012] Figure 3 This is a schematic diagram of the regulating section in a device used to detect and automatically adjust the brightness of the atmosphere in a carbonization furnace. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0014] Combination Figure 1 This embodiment describes a device for detecting and automatically adjusting the brightness of the atmosphere in a carbonization furnace, comprising a high-temperature resistant photoresistor VSR, a regulated DC power supply E, a digital voltmeter V, a digital ammeter A, a voltage divider resistor R, a light-emitting diode K, a switch S, and a valve regulating device. To measure the intensity of the atmosphere brightness inside low- and high-temperature furnaces, a detection system needs to be designed that senses the brightness and displays the corresponding values ​​to determine the atmosphere conditions inside the furnace.

[0015] The high-temperature photoresistor VSR, the regulated DC power supply E, the digital ammeter A, the voltage divider resistor R, the light-emitting diode K, and the switch S form a series circuit, and the digital voltmeter V is connected in parallel with the high-temperature photoresistor VSR. The valve regulating device includes a current transmitter and a controller;

[0016] Combination Figure 2 The high-temperature resistant photoresistor VSR is placed at the furnace opening. In specific implementation, the device is fixed at the gas seal position on the side of the furnace opening, so that the position of the voltmeter and ammeter is maintained at a height of 1.5m above the ground, so as to facilitate observation of the meter readings; the high-temperature resistant photoresistor is connected to the high-temperature resistant shielded wire L, which extends 30cm to 40cm into the furnace chamber from the furnace opening, and the photoresistor VSR and the shielded wire are fixed with a hard metal strip, taking care to avoid the wire bundle;

[0017] Before the first measurement, first check whether the circuit system is operating normally; turn on the regulated DC power supply E, adjust the voltage of power supply E to 3.0V or below, then turn on switch S, check whether the circuit is connected correctly, whether the instrument and photoresistor VSR are displaying or emitting light normally, and whether switch S is normal. After confirming that everything is normal, turn off switch S and prepare to start the measurement.

[0018] Adjust the regulated DC power supply E to stabilize the voltage at 3.0V. Record the ammeter A reading of the regulated DC power supply E. Turn on the switch S and wait for the current to be connected for about 10 seconds. After the readings of the voltmeter V and ammeter A stabilize, observe the brightness of the LED KVSR. The brightness of the LED K is used as an auxiliary verification. At this time, display the corresponding current value and compare it with the current of the furnace atmosphere brightness within the standard range to quantitatively determine the atmosphere condition inside the furnace at this moment.

[0019] Because the brightness of the atmosphere inside the low-temperature furnace varies, the resistance of the photoresistor changes with the brightness of the atmosphere, which in turn changes the current in the circuit. The light-emitting diode (LED) KVSR produces different levels of brightness, and as the brightness of the LED KVSR changes, the corresponding value displayed by ammeter A changes. The atmosphere corresponding to the current is shown in Table 1.

[0020] The ammeter A is connected to a current transmitter, which is connected to a controller (MCU). The current transmitter converts the 0-0.5A current detected by ammeter A into a 4-20mA standard signal and sends it to the controller. The controller stores signal values ​​of furnace atmosphere brightness under different conditions, including a range of 5 levels, which are 4≤I according to different furnace atmospheres. mA <7.2, 7.2≤I mA <8.8, 8.8≤I mA <10.4, 10.4≤I mA <13.6, 13.6≤I mA <20, according to the actual standard signal value falling into the corresponding range, control the valve opening, and adjust the opening by 30% larger, 20% larger, 10% larger, no adjustment required, and 10% smaller than the existing opening.

[0021] The controller sends commands to the exhaust valve to control the valve opening and achieve valve control. The detection system re-detects and readjusts the system atmosphere until the measured current is at the standard state and the atmosphere in the furnace reaches the standard state, thereby achieving automatic adjustment of the furnace atmosphere.

[0022] Table 1

[0023] Serial Number Current A Photoresistor resistance value (Ω) Diode K luminescence Furnace atmosphere brightness 1 0.00≤I＜0.10 30 to infinity Not lit It was very dark. 2 0.10≤I＜0.15 20～30 dark dark 3 0.15≤I＜0.20 15～20 darker dimly lit 4 0.20≤I＜0.30 9～15 Bright On (Standard state) 5 0.30≤I＜0.50 6～9 Very bright Very bright

[0024] Table 2

[0025]

[0026]

Claims

1. A device for detecting and automatically adjusting the brightness of the atmosphere in a carbonization furnace, characterized in that, Including photoresistors, regulated DC power supplies, digital voltmeters, digital ammeters, voltage divider resistors, light-emitting diodes, switches, and valve regulating devices; The photoresistor, regulated DC power supply, digital ammeter, voltage divider resistor, light-emitting diode, and switch form a series circuit, and the digital voltmeter is connected in parallel with the high-temperature photoresistor. The photoresistor is positioned at the furnace opening, extending 30cm to 40cm into the furnace chamber, and connected to a shielded wire, which is then fixed by a metal strip. The light-emitting diode is used to display the brightness of the furnace atmosphere, and the digital ammeter is used to detect the current value corresponding to the furnace atmosphere brightness and send the detected current value to the valve regulating device. The valve regulating device converts the detected current value into a standard signal value and controls the valve opening based on the stored signal values ​​of the furnace atmosphere brightness under different states, so that the atmosphere state inside the furnace reaches the standard state. The valve regulating device includes a current transmitter and a controller; The digital ammeter is connected to the controller via a current transmitter. The current transmitter converts the detected current value into a standard signal value and sends it to the controller. The controller stores signal values ​​of furnace atmosphere brightness under different conditions and compares the standard signal value converted by the current transmitter with the signal values ​​of furnace atmosphere brightness under different conditions stored in the controller. Based on the range in which the standard signal value falls, the valve opening is controlled. The current transmitter converts the current detected by the digital ammeter into a 4-20mA standard signal, and the controller stores the signal values ​​of the furnace atmosphere brightness under different conditions, including 5 ranges: 4≤I mA <7.2, 7.2≤I mA <8.8, 8.8≤I mA <10.4, 10.4≤I mA <13.6, 13.6≤I mA <20, the corresponding valve opening adjustments are as follows: adjust by 30% based on the existing opening, increase by 30% based on the existing opening, increase by 20% based on the existing opening, increase by 10% based on the existing opening, no adjustment is needed, decrease by 10% based on the existing opening.

2. The apparatus for detecting and automatically adjusting the brightness of the atmosphere in a carbonization furnace according to claim 1, characterized in that, The detection method is as follows: First, check if the circuit system is operating normally: turn on the regulated DC power supply, adjust the DC power supply voltage, then turn on the switch and check if the circuit is connected correctly, if the ammeter and voltmeter are displaying normally, if the photoresistor is emitting light normally, and if the switch is working properly. After confirming that everything is normal, turn off the switch and prepare to start the measurement. Adjust the regulated DC power supply, record the ammeter reading of the regulated DC power supply, turn on the switch, and after the voltmeter and ammeter readings stabilize, observe the brightness of the LED. The brightness of the LED is used as an auxiliary verification. At this time, display the corresponding current value and compare it with the current of the furnace atmosphere brightness within the standard range to quantitatively determine the atmosphere condition inside the furnace at this moment. The current detected by the ammeter is converted into a standard signal by the current transmitter and sent to the controller to control the opening degree of the valve according to the different atmospheres in the furnace.

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