Universal method and device for electric heating regeneration of saturated activated carbon

Abstract

The invention discloses a general method and device for electric heating regeneration of saturated activated carbon, and the regeneration method is as follows: when the saturated activated carbon flows into a preheating cavity and is heated to a preheating temperature, the saturated activated carbon flows into a regeneration cavity, a vibration device is started, two electrode plates in the regeneration cavity are electrified, and under the condition of constant voltage, the saturated activated carbon flows into the regeneration cavity; and monitoring the temperature of the saturated activated carbon particle swarms in the regeneration cavity in real time by controlling the amplitude and frequency of the vibration equipment, and stopping adjusting the amplitude and frequency of the vibration equipment until the temperature reaches the preset regeneration temperature, so as to complete the regeneration of the saturated activated carbon. The problem that electric conduction is difficult due to large apparent resistance at the initial stage of saturated activated carbon electric heating regeneration is solved through preheating, carbon particles reach the regeneration temperature within the shortest time by continuously adjusting the amplitude and frequency of vibration equipment, overall temperature rise is more uniform, regeneration products generated in the regeneration process rapidly overflow, and the regeneration efficiency is improved. The heat and mass transfer process is promoted, so that the regeneration efficiency of saturated activated carbon is improved.

Description

Technical Field

[0001] The invention relates to the technical field of saturated activated carbon regeneration, and in particular to a general method and device for electrothermal regeneration of saturated activated carbon. Background Art

[0002] Saturated activated carbon electrothermal regeneration refers to the use of the conductivity of activated carbon and its own conductive current in the electric field to heat the saturated activated carbon particle group. This method uses direct heating and has the advantages of small regeneration equipment, low energy consumption, fast start and stop, and less exhaust gas.

[0003] However, the resistance value of saturated activated carbon particle group varies greatly due to the influence of activated carbon morphology, raw materials, quality, adsorbed substances and temperature. Under certain conditions, the resistance of saturated activated carbon particle group can range from a few ohms to several megohms. Since saturated activated carbon adsorbs a large amount of organic matter, the apparent resistance value of its particle group is often high, especially for coal-based columnar granular activated carbon or coconut shell activated carbon that have been used for many years. Obviously, the resistance value is too high, and under low voltage conditions, saturated activated carbon particle group is difficult to conduct electricity. Unless it is electrocuted with high voltage electricity of tens of thousands of volts, it is obviously difficult to regenerate it with high voltage electricity, both in terms of safety, industrial controllability and practicality. Therefore, how to quickly electrothermally regenerate saturated activated carbon with extremely different physical parameters is an issue of great research value. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention proposes a general method and device for electrothermal regeneration of activated carbons of different saturations.

[0005] The present invention provides a general method for electrothermal regeneration of saturated activated carbon, which is specifically as follows:

[0006] The saturated activated carbon is flowed into the preheating chamber for heating, and the temperature of the saturated activated carbon particle group in the preheating chamber is monitored in real time. When heated to the preheating temperature, the upper computer controls the discharge port of the preheating chamber to open, so that the saturated activated carbon flows into the regeneration chamber. At this time, the vibration equipment is started, and the two electrode plates in the regeneration chamber are energized. Under the condition of constant voltage, the amplitude and frequency of the vibration equipment are controlled by the PID controller, and the temperature of the saturated activated carbon particle group in the regeneration chamber is monitored in real time. The upper computer sends the real-time temperature of the saturated activated carbon particle group in the regeneration chamber to the PID controller until the saturated activated carbon particle group in the regeneration chamber is heated to the preset regeneration temperature. The PID controller stops adjusting the amplitude and frequency of the vibration equipment to complete the regeneration of the saturated activated carbon.

[0007] Preferably, the preheating temperature is set to T P =T d -T a , Ta The value is between 100 and 200 °C, T d The settings are as follows: extract a saturated activated carbon sample, heat it in a preheating chamber, and monitor the temperature and apparent resistance of the saturated activated carbon particle group in the preheating chamber in real time. According to the data of the apparent resistance of the saturated activated carbon particle group in the preheating chamber changing with temperature, the relationship curve equation of the apparent resistance R and temperature T is obtained by fitting. According to the curve equation, the first-order derivative of the temperature is calculated, and the formula is taken. The temperature at that time is T d , where R0 is the initial apparent resistance of the saturated activated carbon particle group at room temperature.

[0008] More preferably, the preheating temperature is set to 350°C.

[0009] Preferably, the preset regeneration temperature is 850°C.

[0010] Preferably, the PID controller controls the amplitude and frequency of the vibration device until the saturated activated carbon particle group is heated to a preset regeneration temperature as follows:

[0011] ① The temperature sensor monitors whether the temperature of the saturated activated carbon particle group in the regeneration chamber reaches the preset regeneration temperature. The upper computer sends the real-time temperature of the saturated activated carbon particle group in the regeneration chamber to the PID controller. The regeneration process ends when the temperature of the saturated activated carbon particle group in the regeneration chamber reaches the preset regeneration temperature, otherwise, step ② is executed; step ② is as follows: the PID controller adjusts the amplitude of the vibration device, and stores the detected current flowing through the saturated activated carbon particle group in the regeneration chamber in the current variable I1, and compares I1 with the preset current initial value I0. If I1>I0, I1 is assigned to I0, and the amplitude of the vibration device is continuously adjusted until I1≤I0, and I0 is assigned to the current variable I2; then, the PID controller adjusts the frequency of the vibration device, and stores the detected current flowing through the saturated activated carbon particle group in the regeneration chamber in the current variable I3, and compares I3 with I2. If I3>I2, I3 is assigned to I2, and the frequency of the vibration device is continuously adjusted until I3≤I2, and I2 is assigned to I0; ③ Return to step ① for execution.

[0012] Preferably, in the PID controller, the main regulator compares the current initial value I0 with the current variable I1 and adjusts the amplitude, the main variable transmitter feeds back the current variable I1, the sub-regulator compares the current variable I2 with the current variable I3 and adjusts the frequency, and the sub-variable transmitter feeds back the current variable I3.

[0013] The present invention discloses a device for electrothermal regeneration of saturated activated carbon, comprising a preheating chamber, a regeneration chamber, a vibration device, an electric heating chamber and a heat preservation chamber. The preheating chamber is provided with a feed port and a discharge port; the preheating chamber is placed in the electric heating chamber, and a temperature sensor whose signal output end is connected to a host computer is provided inside the preheating chamber; two electrode plates facing each other are fixed inside the regeneration chamber, each electrode plate is provided with a wiring terminal, and a temperature sensor whose signal output end is connected to a host computer is also provided in the regeneration chamber; the regeneration chamber is placed in the heat preservation chamber and placed on the vibration device.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The present invention finds that during the heating process of the electrothermal regeneration of saturated activated carbon, its apparent resistance shows a downward trend that is first fast and then slow, and from a certain temperature, the decline becomes extremely slow, showing an extremely slow linear decline, and at about 300°C, the resistance value has been reduced to less than 2% of the original resistance. Therefore, before the saturated activated carbon is regenerated by electric arc, the present invention heats it to a preheating temperature of 200 to 400°C, which can not only remove the moisture and some small molecular organic matter in the saturated activated carbon, but also greatly reduce its apparent resistance, so as to solve the problem that the apparent resistance of the saturated activated carbon is large and difficult to conduct electricity in the initial stage of electrothermal regeneration. Among them, by performing a preheating experiment on the saturated activated carbon sample, the relationship curve equation of the apparent resistance changing with temperature is fitted, and the appropriate preheating temperature can be calculated.

[0016] 2. The present invention studies the arc discharge effect of moving saturated activated carbon particles in an electric field and finds that the apparent resistance of a saturated activated carbon particle group during movement is less than its static resistance, and the specific value of the apparent resistance during movement varies greatly with the movement characteristics of the saturated activated carbon particles. Therefore, in the process of arc regeneration of saturated activated carbon particles through two electrode plates, the present invention controls the movement of the saturated activated carbon particle group through a vibration device, adjusts its movement state, and causes collision and friction between the saturated activated carbon particles, thereby avoiding the problem of long-term local arc short circuits, making the heating process of the saturated activated carbon particle group more stable, and more effectively destroying or removing organic matter and oxygen-containing functional groups on the surface of the saturated activated carbon, further reducing its apparent resistance.

[0017] 3. Under the condition of constant voltage, the present invention adjusts the amplitude and frequency of the vibration equipment through the PID controller at various temperatures in the regeneration process of saturated activated carbon particles, so that the current value flowing through the saturated activated carbon particles reaches the maximum at the corresponding temperature, and the input power reaches the maximum, so that the saturated activated carbon is quickly heated up. As the temperature rises, the amplitude and frequency of the vibration equipment are continuously adjusted through the PID controller, so that the carbon particles reach the regeneration temperature in the shortest time. Not only is the overall temperature rise more uniform, but the regeneration products generated in the regeneration process can also overflow quickly, which promotes the heat and mass transfer process, thereby improving the regeneration efficiency of the saturated activated carbon.

[0018] 4. The regeneration method of the present invention has high versatility, especially for high-resistance saturated activated carbon that is difficult to regenerate by electrothermal regeneration.

[0019] 5. The regeneration method of the present invention not only improves the production efficiency of saturated activated carbon regeneration, but also can fully tap the potential of the power supply, so that the current can reach the maximum possible under the condition of constant voltage, thereby increasing the heating rate of saturated activated carbon, shortening the heating time, improving production efficiency, and having obvious energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a simplified structural diagram of a device for electrothermal regeneration of saturated activated carbon according to the present invention;

[0021] Figure 2 This is a flow chart of the regeneration of saturated activated carbon according to the present invention;

[0022] Figure 3 It is a comparison chart of the trend of current change with vibration amplitude during regeneration of high resistance saturated activated carbon and low resistance saturated activated carbon;

[0023] Figure 4 It is a comparison chart of the trend of current changing with vibration frequency during regeneration of high resistance saturated activated carbon and low resistance saturated activated carbon;

[0024] Figure 5 It is a control flow chart of the PID controller in the present invention;

[0025] Figure 6 It is the structural block diagram of the PID controller in the present invention;

[0026] Figure 7 The following is a comparison of the resistance curves of high-resistance saturated activated carbon and low-resistance saturated activated carbon versus temperature;

[0027] Figure 8 The curve comparison diagram of the resistance of high-resistance saturated activated carbon and low-resistance saturated activated carbon at 27°C with the amplitude and frequency respectively;

[0028] Fig. 9 The curve comparison of the resistance of high-resistance saturated activated carbon and low-resistance saturated activated carbon at 400°C with the amplitude and frequency respectively;

[0029] Fig.10 The curve comparison of the resistance of high-resistance saturated activated carbon and low-resistance saturated activated carbon at 800°C with the amplitude and frequency respectively;

[0030] Fig.11 This is a curve comparison of the temperature change over time of low resistance saturated activated carbon under different conditions with or without vibration;

[0031] Fig.12 This is a comparison chart of the temperature change over time of high resistance saturated activated carbon under different conditions with and without vibration.

[0032] Figure 1 Middle: 1 feeding port, 2 preheating chamber, 3 regeneration chamber, 4 vibration equipment, 5 electric heating bin, 6 discharge port, 7 wiring terminal, 8 insulation chamber, 9 bin door. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] The present invention studies the arc discharge effect of moving saturated activated carbon particles in an electric field and finds that the apparent resistance of a saturated activated carbon particle group during movement is less than its static resistance, and the specific value of the apparent resistance during movement varies greatly with the movement characteristics of the saturated activated carbon particles. The apparent resistance of a saturated activated carbon particle group is composed of the surface contact resistance of the saturated activated carbon and the bulk resistance of the saturated activated carbon particles. In the initial stage of heating of the saturated activated carbon electrothermal regeneration, the surface contact resistance accounts for the main component of the apparent resistance of the saturated activated carbon particle group. The surface contact resistance of saturated activated carbon is greatly affected by the adsorbed substances near the surface of the saturated activated carbon and the oxygen-containing functional groups adsorbed on the surface of the saturated activated carbon.

[0035] It can be seen from this that if saturated activated carbon with extremely different physical parameters is rapidly regenerated by electrothermal method, there are three problems: (1) the problem of its initial large apparent resistance must be solved; (2) its apparent resistance must be reduced as much as possible by adjusting the motion state of its particle group; (3) as the temperature of saturated activated carbon rises, its resistance characteristics change greatly, and the power supply equipment needs to be able to adjust according to its apparent resistance at that time so that the resistance reaches the minimum value and the purpose of rapid heating is achieved.

[0036] The present invention found that during the temperature rise process of saturated activated carbon electrothermal regeneration, as the surface and internal substances overflow or decompose, its apparent resistance shows a decreasing trend first fast and then slow. Figure 7. Figure 7 Two saturated activated carbons with different resistance values ​​are used as examples. The high-resistance saturated activated carbon is a 10-year-old coal-based columnar granular activated carbon, and the low-resistance activated carbon is a 2-year-old coconut shell activated carbon. It can be seen that starting from about 450°C, the decline becomes extremely slow, showing an extremely slow linear decline, and there is a region where the absolute value of the first-order derivative is small, or even tends to 0. Before that, at about 300°C, the resistance value dropped to less than 2% of the original resistance. The present invention has found that the temperature and resistance characteristics of saturated activated carbons of other types and different fields of use all have such a very similar trend of change. Almost all of them start at about 450°C, the decline becomes extremely slow, showing an extremely slow linear decline, and there is a region where the first-order derivative is small and approximately unchanged. It can be seen that before the saturated activated carbon is regenerated by arc, it can be heated to a certain temperature to greatly reduce its apparent resistance, thereby solving the first problem.

[0037] Furthermore, the present invention solves the second problem by controlling the movement of the saturated activated carbon particle group through a vibration device with adjustable amplitude and frequency.

[0038] The present invention has found that after the saturated activated carbon particle group is moved by the vibration device, under the condition of constant voltage, the apparent resistance of the saturated activated carbon particle group has a trend of first decreasing and then increasing with the increase of the amplitude, and has a minimum value. When the voltage is constant, the current is at the maximum value. Figure 3 As the vibration frequency increases, the apparent resistance of the saturated activated carbon particle group will drop to a certain value and remain unchanged. At this time, the current will maintain a maximum value as the frequency increases. Figure 4 .

[0039] Therefore, under the condition of constant voltage (the specific voltage value is determined by the specific power supply), at a certain temperature, the amplitude and frequency of the vibration equipment can be adjusted by the PID controller so that its current value reaches the maximum, and the input power reaches the maximum, so that the saturated activated carbon heats up quickly. As the temperature rises, the amplitude and frequency of the vibration equipment are continuously adjusted by the PID controller so that the carbon particles reach the regeneration temperature in the shortest time, thereby improving production efficiency. This is to solve the third problem.

[0040] Embodiment 1:

[0041] See Figure 1, a device for electrothermal regeneration of saturated activated carbon, comprising a preheating chamber 2, a regeneration chamber 3, a vibration device 4, an electric heating chamber 5 and a heat preservation chamber 8. The preheating chamber 2 is provided with a feed port 1 and a discharge port 6, and the saturated activated carbon flows into the preheating chamber 2 through the feed port 1; the preheating chamber is placed in an electric heating bin 5, and a temperature sensor is provided inside the preheating chamber to detect the temperature of the saturated activated carbon inside the chamber, wherein the temperature sensor transmits data to the host computer in real time; when the temperature of the saturated activated carbon is detected to reach 350°C, the host computer controls the discharge port 6 to open, so that the saturated activated carbon flows into the regeneration chamber 3; two electrode plates facing each other are fixed inside the regeneration chamber, and each electrode plate is provided with a wiring terminal 7 for connecting an external voltage to energize the saturated activated carbon, and a temperature sensor is also provided in the regeneration chamber 3 to transmit data to the host computer; the regeneration chamber is placed in an insulation chamber 8 and is placed on a vibration device 4, and when the vibration device starts working, the saturated activated carbon particle group in the regeneration chamber will move; the insulation chamber 8 is provided with a silo door 9.

[0042] Embodiment 2:

[0043] A general method for electrothermal regeneration of saturated activated carbon is as follows:

[0044] Open the feed port 1 to allow the saturated activated carbon to flow into the preheating chamber 2, then close the feed port 1, power on the electric heating chamber 5 to start heating, and use a stopwatch to record the time from this point on, and use a temperature sensor to monitor the temperature of the saturated activated carbon particle group in the preheating chamber in real time. When the saturated activated carbon particle group in the preheating chamber is heated to 350°C, the host computer controls the discharge port 6 to open, allowing the saturated activated carbon to flow into the regeneration chamber 3. At this time, start the vibration device 4, and power the electrode plate (made of graphite) through the terminal. When the voltage is constant, see Figure 5 and Figure 6 The amplitude and frequency of the vibration equipment are controlled by the PID controller, and the temperature sensor is used to monitor the temperature of the saturated activated carbon particle group in the regeneration chamber in real time. The upper computer sends the real-time temperature of the saturated activated carbon particle group in the regeneration chamber to the PID controller until the saturated activated carbon particle group in the regeneration chamber is heated to 850°C. The PID controller stops adjusting the amplitude and frequency of the vibration equipment and completes the regeneration of the saturated activated carbon.

[0045] Among them, low-resistance saturated activated carbon and high-resistance saturated activated carbon were regenerated according to the method steps.

[0046] See Figure 5 , the PID controller controls the amplitude and frequency of the vibration equipment until the saturated activated carbon particle group is heated to 850°C. The process is as follows:

[0047] ① The temperature sensor monitors whether the temperature of the saturated activated carbon particle group in the regeneration chamber reaches 850°C. The host computer sends the real-time temperature of the saturated activated carbon particle group in the regeneration chamber to the PID controller. The process ends when the temperature of the saturated activated carbon particle group in the regeneration chamber reaches 850°C, otherwise, step ② is executed; step ② is as follows: the PID controller adjusts the amplitude of the vibration device, and stores the detected current flowing through the saturated activated carbon particle group in the regeneration chamber (detected by connecting the wiring terminals of the two electrode plates to the main variable transmitter. In addition, in order to observe the apparent resistance data of the saturated activated carbon particle group, the wiring terminals of the two electrode plates are connected to a resistance detector and the detection data is sent to the host computer) in the current variable I1, and I 1 is compared with the preset initial current value I0. If I1>I0, I1 is assigned to I0, and the amplitude of the vibration device is continuously adjusted until I1≤I0, and I0 is assigned to the current variable I2; then, the PID controller adjusts the frequency of the vibration device, and stores the detected current flowing through the saturated activated carbon particle group in the regeneration chamber (detected by connecting the terminals of the two electrode plates to the secondary variable transmitter) in the current variable I3, and I3 is compared with I2. If I3>I2, I3 is assigned to I2, and the frequency of the vibration device is continuously adjusted until I3≤I2, and I2 is assigned to I0 (it can also be assigned to the current variable I4 first, and then I4 is assigned to I0); ③ Return to step ① to execute.

[0048] The structure of PID controller is shown in Figure 6 The main regulator is used to compare the initial current value I0 (i.e. the adjustment amount X1 in the PID controller) with the current variable I1 (i.e. the adjustment amount Y1 in the PID controller) and adjust the amplitude. The main variable transmitter is used to feed back the current variable I1. The sub-regulator is used to compare the current variable I2 (i.e. the adjustment amount X2 in the PID controller) with the current variable I3 (i.e. the adjustment amount Y2 in the PID controller) and adjust the frequency. The sub-variable transmitter is used to feed back the current variable I3.

[0049] Comparative Example:

[0050] A general method for electrothermal regeneration of saturated activated carbon is as follows:

[0051] Open the feed port 1 to allow the saturated activated carbon to flow into the preheating chamber 2, then close the feed port 1, power on the electric heating chamber 5 to start heating, and use a stopwatch to record the time from this point on, and use a temperature sensor to monitor the temperature of the saturated activated carbon particle group in the preheating chamber in real time. When the saturated activated carbon particle group in the preheating chamber is heated to 350°C, the upper computer controls the discharge port 6 to open, allowing the saturated activated carbon to flow into the regeneration chamber 3. At this time, do not start the vibration device 4, power on the electrode plate through the terminal, and use the temperature sensor to monitor the temperature of the saturated activated carbon particle group in the regeneration chamber in real time until the saturated activated carbon particle group in the regeneration chamber is heated to 850°C.

[0052] Among them, low-resistance saturated activated carbon and high-resistance saturated activated carbon were regenerated according to the method steps.

[0053] This comparative example is set up to explore the relationship between the regeneration temperature of the low-resistance saturated activated carbon and the high-resistance saturated activated carbon and time when the vibration device 4 is used and when the vibration device 4 is not used, and the regeneration temperature is also set to 850°C.

[0054] The temperature of low resistance saturated activated carbon changes with time under different conditions of vibration or no vibration of the vibration device 4. Fig.11 The temperature of high resistance saturated activated carbon changes with time under different conditions of vibration or no vibration of the vibration device 4. Fig.12 It can be seen that the low-resistance saturated activated carbon greatly shortens the time to reach the regeneration temperature of 850°C under vibration. When the high-resistance saturated activated carbon is tested without vibration according to the comparative example, the change in its regeneration temperature is a slow decrease. This verifies that the high-resistance saturated activated carbon cannot be regenerated successfully without the use of vibration equipment, but with the addition of vibration, the high-resistance saturated activated carbon can reach a regeneration temperature of 850°C.

[0055] In order to further verify the effectiveness of the present invention in reducing the resistance of saturated activated carbon particle groups by the vibration of the vibration device 4 and the real-time change of amplitude and frequency, three temperature points of 27°C, 400°C and 800°C were set to carry out vibration heating regeneration of saturated activated carbon, and the relationship between the resistance and amplitude and frequency of the saturated activated carbon was explored respectively.

[0056] ① Regeneration of saturated activated carbon by vibration heating at room temperature 27°C: Open the feed port 1 and the discharge port 6 to allow the saturated activated carbon particle group to flow into the regeneration chamber 3, start the vibration device 4 and energize the electrode plate through the terminal. Under the condition of constant voltage, adjust the amplitude or frequency of the vibration device 4 through the PID controller, record the corresponding saturated activated carbon particle group characterization resistance under different amplitudes and frequencies, and obtain the curve diagram of the resistance of the saturated activated carbon particle group at 27°C as a function of amplitude and frequency, as shown in FIG. Figure 8 Among them, low-resistance saturated activated carbon and high-resistance saturated activated carbon were regenerated according to the steps.

[0057] ② Regeneration of saturated activated carbon by vibration heating at 400°C: open the feed port 1 to allow the saturated activated carbon particle group to flow into the preheating chamber 2, then close the feed port 1, power on the electric heating chamber 5 to start heating, and use the temperature sensor to monitor the temperature of the saturated activated carbon particle group in the preheating chamber in real time. When the saturated activated carbon particle group in the preheating chamber is heated to 350°C, the upper computer controls the discharge port 6 to open, allowing the saturated activated carbon particle group to flow into the regeneration chamber 3. At this time, the vibration device 4 is started, and the electrode plate is energized through the terminal. Under the condition of constant voltage, the amplitude or frequency of the vibration device 4 is adjusted by the PID controller, and the temperature of the saturated activated carbon particle group in the regeneration chamber is monitored in real time by the temperature sensor. The host computer sends the real-time temperature of the saturated activated carbon particle group in the regeneration chamber to the PID controller. When the real-time temperature of the saturated activated carbon particle group in the regeneration chamber reaches 400°C, the amplitude or frequency of the vibration device 4 is readjusted, and the corresponding saturated activated carbon particle group characterization resistance is recorded under different amplitudes and frequencies, and a curve diagram of the resistance of the saturated activated carbon particle group at 400°C as a function of amplitude and frequency is obtained, as shown in FIG. Fig. 9 Among them, low-resistance saturated activated carbon and high-resistance saturated activated carbon were regenerated according to the steps.

[0058] ③ Regeneration of saturated activated carbon by vibration heating at 800°C: open the feed port 1 to allow the saturated activated carbon particle group to flow into the preheating chamber 2, then close the feed port 1, power on the electric heating chamber 5 to start heating, and use the temperature sensor to monitor the temperature of the saturated activated carbon particle group in the preheating chamber in real time. When the saturated activated carbon particle group in the preheating chamber is heated to 350°C, the upper computer controls the discharge port 6 to open, allowing the saturated activated carbon particle group to flow into the regeneration chamber 3. At this time, the vibration device 4 is started, and the electrode plate is energized through the terminal. Under the condition of constant voltage, the amplitude or frequency of the vibration device 4 is adjusted by the PID controller, and the temperature of the saturated activated carbon particle group in the regeneration chamber is monitored in real time by the temperature sensor. The host computer sends the real-time temperature of the saturated activated carbon particle group in the regeneration chamber to the PID controller. When the real-time temperature of the saturated activated carbon particle group in the regeneration chamber reaches 800°C, the amplitude or frequency of the vibration device 4 is readjusted, and the corresponding saturated activated carbon particle group characterization resistance is recorded under different amplitudes and frequencies, and a curve diagram of the resistance of the saturated activated carbon particle group at 800°C as a function of amplitude and frequency is obtained, as shown in FIG. Fig.10 Among them, low-resistance saturated activated carbon and high-resistance saturated activated carbon were regenerated according to the steps.

[0059] From the above experiments on vibration heating regeneration of saturated activated carbon at three temperature points of 27°C, 400°C and 800°C, it can be analyzed that there is an optimal amplitude and an optimal frequency in the process of regeneration of the saturated activated carbon particle group by the vibration equipment at different temperatures, and through the PID controller, under the condition of constant voltage, the amplitude and frequency are always controlled to be near the optimal amplitude and the optimal frequency at different temperatures, and the optimal resistance value of the saturated activated carbon particle group at different temperatures can be obtained, so that the saturated activated carbon can be quickly heated and regenerated at different temperatures, and finally the required saturated activated carbon regeneration temperature can be efficiently reached.

Claims

1. A general method for electrothermal regeneration of saturated activated carbon, characterized in that: The saturated activated carbon is flowed into the preheating chamber for heating, and the temperature of the saturated activated carbon particle group in the preheating chamber is monitored in real time. When heated to the preheating temperature, the upper computer controls the discharge port of the preheating chamber to open, so that the saturated activated carbon flows into the regeneration chamber. At this time, the vibration equipment is started, and the two electrode plates in the regeneration chamber are energized. Under the condition of constant voltage, the amplitude and frequency of the vibration equipment are controlled by the PID controller, and the temperature of the saturated activated carbon particle group in the regeneration chamber is monitored in real time. The upper computer sends the real-time temperature of the saturated activated carbon particle group in the regeneration chamber to the PID controller until the saturated activated carbon particle group in the regeneration chamber is heated to the preset regeneration temperature. The PID controller stops adjusting the amplitude and frequency of the vibration equipment to complete the regeneration of the saturated activated carbon.

2. A general method for electrothermal regeneration of saturated activated carbon according to claim 1, characterized in that: Set the preheat temperature to T P =T d -T a , T a The value is between 100 and 200 °C, T d The settings are as follows: extract a saturated activated carbon sample, heat it in a preheating chamber, and monitor the temperature and apparent resistance of the saturated activated carbon particle group in the preheating chamber in real time. According to the data of the apparent resistance of the saturated activated carbon particle group in the preheating chamber changing with temperature, the relationship curve equation of the apparent resistance R and temperature T is obtained by fitting. According to the curve equation, the first-order derivative of the temperature is calculated, and the formula is taken. The temperature at that time is T d , where R0 is the initial apparent resistance of the saturated activated carbon particle group at room temperature.

3. A general method for electrothermal regeneration of saturated activated carbon according to claim 2, characterized in that: The preheat temperature was set to 350°C.

4. A general method for electrothermal regeneration of saturated activated carbon according to claim 1, characterized in that: The preset regeneration temperature is 850°C.

5. A general method for electrothermal regeneration of saturated activated carbon according to any one of claims 1 to 4, characterized in that: The PID controller controls the amplitude and frequency of the vibration equipment until the saturated activated carbon particle group is heated to the preset regeneration temperature as follows: ① The temperature sensor monitors whether the temperature of the saturated activated carbon particle group in the regeneration chamber reaches the preset regeneration temperature. The upper computer sends the real-time temperature of the saturated activated carbon particle group in the regeneration chamber to the PID controller. The regeneration process ends when the temperature of the saturated activated carbon particle group in the regeneration chamber reaches the preset regeneration temperature, otherwise, step ② is executed; step ② is as follows: the PID controller adjusts the amplitude of the vibration device, and stores the detected current flowing through the saturated activated carbon particle group in the regeneration chamber in the current variable I1, and compares I1 with the preset current initial value I0. If I1>I0, I1 is assigned to I0, and the amplitude of the vibration device is continuously adjusted until I1≤I0, and I0 is assigned to the current variable I2; then, the PID controller adjusts the frequency of the vibration device, and stores the detected current flowing through the saturated activated carbon particle group in the regeneration chamber in the current variable I3, and compares I3 with I2. If I3>I2, I3 is assigned to I2, and the frequency of the vibration device is continuously adjusted until I3≤I2, and I2 is assigned to I0; ③ Return to step ① for execution.

6. A general method for electrothermal regeneration of saturated activated carbon according to claim 5, characterized in that: In the PID controller, the main regulator compares the current initial value I0 with the current variable I1 and adjusts the amplitude, the main variable transmitter feeds back the current variable I1, the sub-regulator compares the current variable I2 with the current variable I3 and adjusts the frequency, and the sub-variable transmitter feeds back the current variable I3.

7. A device for electrothermal regeneration of saturated activated carbon, comprising a regeneration chamber, characterized in that: It also includes a preheating cavity, a vibration device, an electric heating bin and a heat preservation cavity; the preheating cavity is provided with a feed port and a discharge port; the preheating cavity is placed in the electric heating bin, and a temperature sensor whose signal output end is connected to a host computer is provided inside the preheating cavity; two electrode plates facing each other are fixedly provided inside the regeneration cavity, each electrode plate is provided with a wiring terminal, and a temperature sensor whose signal output end is connected to a host computer is also provided in the regeneration cavity; the regeneration cavity is placed in the heat preservation cavity and placed on the vibration device.

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