Electrode fault recognition system, recognition method, and machine-readable storage medium

Abstract

The invention relates to the technical field of plasma, and discloses an electrode fault recognition system and method and a machine readable storage medium. The system comprises: an auxiliary electrode; the electrode displacement device is used for moving the auxiliary electrode to a preset position which is a preset distance away from the to-be-identified electrode, and the auxiliary electrode at the preset position and the to-be-identified electrode form a to-be-identified electrode pair; the voltage detection device is used for detecting the initial discharge voltage of the to-be-identified electrode pair in a preset detection environment when the to-be-identified electrode is in a detection state and the auxiliary electrode moves to a preset position, and the detection state is a state that the to-be-identified electrode discharges in response to the initial discharge voltage; and the control device is used for determining whether the to-be-identified electrode has a fault or not according to the initial discharge voltage and the safety threshold interval. According to the invention, fault detection of any electrode can be realized without dismounting the plasma reactor, the judgment result is more accurate and reliable, and the period and cost of manual maintenance are reduced.

Description

Technical Field

[0001] The present invention relates to the field of plasma technology, and in particular to an electrode fault identification system, an identification method and a machine-readable storage medium. Background Art

[0002] Low-temperature plasma is a plasma in a non-thermal equilibrium state, where the electron temperature is much higher than the temperature of ions or neutral particles, and the overall temperature is close to room temperature. Using low-temperature plasma to treat organic waste gas has the characteristics of high efficiency, low energy consumption, and a wide range of applications. This technology has become a hot topic in current research. Dielectric barrier discharge is widely used in the field of organic waste gas treatment because it can produce more uniform and stable plasma.

[0003] However, plasma electrode failures often occur during industrial applications. Since the components of the organic waste gas that needs to be treated are diverse and mostly organic compounds, plasma electrodes are prone to coking after long-term operation. Water vapor that may exist in the waste gas or the environment may cause condensed water droplets to form in the discharge area. The electrode itself may also crack or even break after long-term operation. These have an adverse effect on the long-term stable operation of the plasma treatment device. Moreover, in order to meet the explosion-proof requirements of petrochemical refining enterprises, the discharge disk is usually placed in an opaque explosion-proof box, so it is impossible to use observation to determine the state of the electrode.

[0004] The existing detection and control technology only limits the power supply input voltage and current. However, when the above fault occurs in the plasma electrode, especially when the fault just occurs, the existing technology cannot accurately determine the state of the discharge electrode, and cannot quickly and timely cut the faulty electrode module out of the system. If the plasma reactor continues to operate, it is easy to cause further damage to the plasma electrode, resulting in serious consequences such as burning of circuit components and shutdown of the entire system. Summary of the invention

[0005] The purpose of the present invention is to provide an electrode fault identification system, an identification method and a machine-readable storage medium, which can realize fault detection of any electrode without disassembling the plasma reactor, and introduce the variable of the starting discharge voltage to identify the electrode fault, which is more accurate and reliable than manual judgment, and reduces the cycle and cost of manual maintenance, thereby effectively ensuring the long-term stable operation of the plasma reactor.

[0006] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides an electrode fault identification system, which includes: an auxiliary electrode; an electrode displacement device, configured to move the auxiliary electrode to a preset position at a preset distance from an electrode to be identified in a target electrode pair in the plasma reactor, wherein the auxiliary electrode at the preset position and the electrode to be identified form an electrode pair to be identified; a voltage detection device, configured to detect a starting discharge voltage of the electrode pair to be identified under a preset detection environment when the electrode to be identified is in a detection state and the auxiliary electrode moves to the preset position, wherein the detection state refers to a state in which the electrode to be identified discharges in response to the starting discharge voltage; and a control device, configured to determine whether the electrode to be identified has a fault based on the starting discharge voltage and a safety threshold interval.

[0007] Preferably, the electrode displacement device includes: a sliding unit, including a slideway that passes through the inside and outside of the discharge area of ​​the target electrode pair, and the slideway is used to embed the auxiliary electrode; and a driving unit, used to drive the auxiliary electrode to move along the slideway so that the auxiliary electrode is parallel to the electrode to be identified when it moves to the preset position in the discharge area.

[0008] Preferably, the electrode displacement device further comprises: a fixing unit, configured to fix the auxiliary electrode outside the discharge area when the auxiliary electrode moves out of the discharge area along the slideway.

[0009] Preferably, the electrode displacement device includes: a sliding unit, including two parallel slides, wherein the plane where the two parallel slides are located is parallel to the plane where the target electrode pair is located and the spacing between the two planes is the preset distance, one of the two parallel slides is embedded in one end of the auxiliary electrode and the other is embedded in the other end of the auxiliary electrode; and a driving unit, used to drive the auxiliary electrode to move along the two parallel slides so that the auxiliary electrode is parallel to and opposite to the electrode to be identified when it moves to the preset position.

[0010] Preferably, the control device is configured to determine whether the electrode to be identified has a fault, including: comparing the starting discharge voltage with the safety threshold interval; and when the starting discharge voltage is outside the safety threshold interval, determining that the electrode to be identified has a fault or a risk of fault.

[0011] Preferably, the control device is configured to determine whether the electrode to be identified has a fault or a risk of fault, including: when the starting discharge voltage is greater than the maximum value of the safety threshold interval, determining that the dielectric layer of the electrode to be identified is damaged and the internal metal is completely exposed; when the starting discharge voltage is greater than or equal to a first preset value and less than the minimum value of the safety threshold interval, determining that the dielectric surface of the electrode to be identified has a risk of coking, liquid water adhesion, cracks or damage; when the starting discharge voltage is less than the first preset value, determining that a large amount of coking exists on the dielectric surface of the electrode to be identified, wherein the first preset value is a preset ratio of the minimum value of the safety threshold interval.

[0012] Preferably, the voltage detection device is also configured to detect the starting discharge voltage reference value of the reference electrode pair under the preset detection environment for multiple times to obtain multiple starting discharge voltage reference values, wherein the reference electrode pair is formed by the auxiliary electrode and the unused electrode to be identified with a spacing of the preset distance, and the control device is also configured to: sort the multiple starting discharge voltage reference values; remove the data ranked in the front preset ranking and the rear preset ranking from the multiple starting discharge voltage reference values ​​to obtain the remaining data; and use the minimum value and the maximum value of the remaining data as the minimum value and the maximum value of the safety threshold interval, respectively.

[0013] Preferably, the electrode fault identification system further comprises: a switching device configured to switch the working state and the detection state of the electrode to be identified, wherein the working state of the electrode to be identified is a state in which the electrode to be identified discharges in response to a preset working voltage.

[0014] Preferably, the switching device includes: a working switch, adapted to provide a working power supply setting of the preset working voltage, used to enable the electrode to be identified to start or exit the working state by controlling the power supply of the working power supply; and a detection switch, adapted to provide a detection power supply setting of the starting discharge voltage, used to enable the electrode to be identified to start or exit the detection state by controlling the power supply of the detection power supply.

[0015] Preferably, the electrode fault identification system further comprises: an alarm device, configured to issue an alarm prompt when the control device determines that the electrode to be identified has a fault or a risk of a fault.

[0016] Through the above technical scheme, the present invention creatively can realize fault detection of any electrode without disassembling the plasma reactor, and introduces the variable of starting discharge voltage to identify electrode faults, which is more accurate and reliable than manual judgment, and reduces the cycle and cost of manual maintenance, thereby effectively ensuring the long-term stable operation of the plasma reactor.

[0017] A second aspect of the present invention provides an electrode fault identification method, which is performed based on an auxiliary electrode, wherein the auxiliary electrode can be moved to a preset position at a preset distance from an electrode to be identified in a target electrode pair in a plasma reactor, and the auxiliary electrode at the preset position and the electrode to be identified form an electrode pair to be identified, and the electrode fault identification method includes: detecting a starting discharge voltage of the electrode pair to be identified under a preset detection environment when the electrode to be identified in the electrode pair to be identified is in a detection state and the auxiliary electrode is moved to the preset position, wherein the detection state refers to a state in which the electrode to be identified discharges in response to the starting discharge voltage; and determining whether the electrode to be identified has a fault based on the starting discharge voltage and a safety threshold interval.

[0018] For specific details and benefits of the electrode fault identification method provided by the embodiment of the present invention, please refer to the above description of the electrode fault identification system, which will not be repeated here.

[0019] A third aspect of the present invention provides a machine-readable storage medium having instructions stored thereon, the instructions being used to enable a machine to execute the above-mentioned electrode fault identification method.

[0020] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0022] Figure 1 is a schematic diagram of the structure of a plasma reactor;

[0023] Figure 2 is a structural schematic diagram of an electrode fault identification system provided by an embodiment of the present invention;

[0024] Figure 3 is a structural schematic diagram of an electrode fault identification system provided by an embodiment of the present invention;

[0025] Figure 4 is a structural schematic diagram of an electrode fault identification system provided by an embodiment of the present invention; and

[0026] Figure 5 It is a flow chart of an electrode fault identification process provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0028] Embodiment 1

[0029] Figure 1 This is a schematic diagram of the structure of a plasma reactor. Figure 1 As shown, the plasma reactor includes a working power supply 1 and a discharge electrode pair, wherein the two electrodes of the discharge electrode pair are respectively a first discharge electrode 2 and a second discharge electrode 3, and the working power supply 1 is respectively connected to the first discharge electrode 2 and the second discharge electrode 3. The first discharge electrode 2 and the second discharge electrode 3 each include a metal electrode 12 and a blocking medium 11. When the working power supply 1 applies a working voltage to the first discharge electrode 2 and the second discharge electrode 3, a discharge gas is generated in a discharge region between the metal electrodes 12 of the first discharge electrode 2 and the second discharge electrode 3, and the exhaust gas introduced into the discharge region is purified based on the blocking medium 11, thereby obtaining the treated purified tail gas.

[0030] Figure 1 is just one example of a plasma reactor. Figure 1 The plasma reactor in the embodiment of the present invention includes a group of discharge electrode pairs. The plasma reactor used in the embodiment of the present invention may also include multiple groups of discharge electrode pairs, each group of discharge electrode pairs includes a first discharge electrode and a second discharge electrode.

[0031] The purpose of the embodiment of the present invention is to detect the first discharge electrode or the second discharge electrode in any group of discharge electrode pairs in a plasma reactor to identify whether the first discharge electrode or the second discharge electrode has a fault.

[0032] In view of this, Figure 2 or Figure 3 FIG. 1 is a schematic diagram of the structure of an electrode fault identification system provided by an embodiment of the present invention. Figure 2 or Figure 3 As shown, the electrode fault identification system may include: an auxiliary electrode 4; an electrode displacement device 5; a voltage detection device 6 ( Figure 3 ); and control device 7 ( Figure 3 not shown).

[0033] The electrode displacement device 5 is configured to move the auxiliary electrode 4 to a preset position at a preset distance from the electrode to be identified in the target electrode pair in the plasma reactor, and the auxiliary electrode at the preset position forms an electrode pair to be identified with the electrode to be identified.

[0034] Wherein, the voltage detection device 6 is configured to detect the starting discharge voltage of the electrode pair to be identified when the electrode to be identified is in the detection state and the auxiliary electrode moves to the preset position, wherein the detection state refers to the state in which the electrode to be identified discharges in response to the starting discharge voltage.

[0035] The control device 7 is configured to determine whether the electrode to be identified fails according to the starting discharge voltage and a safety threshold range.

[0036] For example, this embodiment is to perform fault identification on any one of the two electrodes (the first discharge electrode 2 and the second discharge electrode 3) of the discharge electrode pair. Among them, the discharge electrode to be fault identified is the electrode to be identified. The auxiliary electrode 4 can be an electrode with the same structure and function as the two electrodes in the discharge electrode pair. The material of the auxiliary electrode 4 and the metal electrode inside the two discharge electrodes can be iron, copper, tungsten and other metals, among which iron is preferably used. The material of the blocking medium on the surface of the auxiliary electrode 4 can be quartz, ceramic, nylon and the like, among which quartz is preferably used. In addition, the shape of the auxiliary electrode 3 and the two discharge electrodes can be a tubular structure or a plate structure, and the two can adopt the same structure. The detection voltage can be provided by a preset detection power supply 8 (such as Figure 2 As shown) or working power supply 1 (as Figure 2 The detection power supply 8 is similar to the working power supply 1 of the plasma reactor, and the output power and volume of the detection power supply 8 are smaller than those of the working power supply 1. The detection power supply 8 may include an AC power supply, a pulse power supply, etc., wherein an AC power supply is preferably used.

[0037] The control device 7 can be, but not limited to, a single chip microcomputer, a DSP, a PLC, etc. The various devices in the electrode fault identification system of the embodiment of the present invention can use, but not limited to, the following communication methods: 485, 232, CAN. Among them, the signal line should have the ability to shield high-frequency electromagnetic interference. The control device 7 can have the ability to feedback the system status and display the current status, which can be achieved by means of a host computer display screen, an indicator light, etc.

[0038] Since the auxiliary electrode has the same structure and function as the two discharge electrodes, the auxiliary electrode can form an electrode pair to be identified with any discharge electrode, and the electrode pair to be identified begins to generate a discharge current under the action of a certain voltage, wherein the certain voltage is the starting discharge voltage. Taking the first discharge electrode 2 as an example, if the first discharge electrode 2 is in a normal state, the first discharge electrode 2 and the auxiliary electrode 4 begin to generate a discharge current under the action of the starting discharge voltage (or detection voltage). If the first discharge electrode 2 fails, the starting discharge voltage between it and the auxiliary electrode 4 will change significantly compared to the starting discharge voltage between it and the auxiliary electrode 4 before the failure. Therefore, the embodiment of the present invention uses the auxiliary electrode as a reference electrode to perform fault identification on the first discharge electrode or the second discharge electrode.

[0039] For example, the voltage detection device 6 can use a voltage sensor or the like to realize voltage detection. The voltage detection device 6 is connected to the control device 7 and is connected in parallel with a preset detection power supply 8. When the voltage loaded at both ends of the electrode to be identified and the auxiliary electrode gradually increases to a certain critical value, the air gap between the electrodes is broken down and discharge occurs. The instantaneous voltage at the beginning of the discharge is the starting discharge voltage between the auxiliary electrode and the electrode to be identified. Taking the electrode to be identified as the first discharge electrode 2 as an example, the detection process of the starting discharge voltage is: when the auxiliary electrode 4 is located in the discharge area and the first discharge electrode 2 is in the detection state, the detection power supply 8 is started. The detection power supply 8 gradually increases the detection voltage for the auxiliary electrode 4 and the first discharge electrode 2, and the voltage detection device 6 detects the change of the detection voltage applied by the detection power supply 8 to the auxiliary electrode 4 and the first discharge electrode 2 in real time. When it is obtained that the auxiliary electrode 4 and the first discharge electrode 2 start to discharge, the detection voltage applied by the detection power supply 8 detected by the voltage detection device 6 at this time is the starting discharge voltage. Further, the voltage detection device 6 sends the detected starting discharge voltage to the control device 7.

[0040] Alternatively, in order to obtain a more accurate starting discharge voltage, an average value can be obtained by multiple measurements. After obtaining the starting discharge voltage in the above manner, control the detection power supply 8 to reduce the voltage to 0, and then continue to increase the voltage to obtain another starting discharge voltage data in a similar manner to the above, repeat this step, obtain n starting discharge voltage data, sort by voltage, remove the first 1 / 10 and the last 1 / 10 data (round down), and take the average of the remaining data to obtain the starting discharge voltage measurement value U S .

[0041] In this embodiment, the electrode fault identification system introduces an auxiliary electrode on the one hand, and identifies whether the discharge electrode has a fault by controlling the discharge state between the auxiliary electrode and the discharge electrode, and on the other hand, uses the starting discharge voltage between the discharge electrode and the auxiliary electrode as a reference for identifying the fault. Compared with the prior art, the electrode fault system of this embodiment can detect the fault of the discharge electrode without affecting the operation of the plasma reactor, and there is no need to disassemble the plasma reactor. In addition, the fault identification system has a simple and practical structure, and does not require manual fault identification, which effectively improves the accuracy and timeliness of electrode fault identification.

[0042] Embodiment 2

[0043] With respect to the above-mentioned electrode fault identification system, the structure and function thereof are further introduced in detail below.

[0044] like Figure 4 As shown, the electrode displacement device 5 may include: a sliding unit 51, including a slideway running through the inside and outside of the discharge area of ​​the target electrode pair, and the slideway is used to embed the auxiliary electrode 4; and a driving unit 52, used to drive the auxiliary electrode 4 to move along the slideway, so that the auxiliary electrode 4 moves to the preset position in the discharge area and is parallel to the electrode to be identified.

[0045] When the auxiliary electrode 4 moves into the discharge region between the target electrode pair (for example, the first discharge electrode 2 and the second discharge electrode 3), the auxiliary electrode 4 can be in a parallel relative position with the first discharge electrode 2 and the second discharge electrode 3, respectively, and the distance between the auxiliary electrode 4 and the first discharge electrode 2 and the second discharge electrode 3 is the same. When the auxiliary electrode 4 moves into the discharge region, the auxiliary electrode and the electrode to be identified (for example, the first discharge electrode 2) can generate discharge under the action of the detection voltage.

[0046] Furthermore, the electrode displacement device 5 may further include: a fixing unit 53, which is used to fix the auxiliary electrode 4 outside the discharge area when the auxiliary electrode 4 moves out of the discharge area along the slideway.

[0047] For example, the sliding unit 51 can use a structure such as a slide rail to realize the movement of the auxiliary electrode. In order to realize the movement of the auxiliary electrode 4 between the inside and outside of the discharge area, a part of the sliding unit 51 needs to be placed in the discharge area, while the other part needs to be placed outside the discharge area, and the length of the two parts can be flexibly set according to the actual structural size of the auxiliary electrode 4. The driving unit 52 can use a motor or the like to realize the drive control of the auxiliary electrode, and the driving unit 52 is controlled by the system control device 7. The driving unit 52 can control the moving speed and moving direction of the auxiliary electrode 4 on the slideway of the sliding unit 51. Different fixing structures can be used between the fixing unit 53 and the auxiliary electrode 4. For example, a mutually adaptable connecting device can be set at the contact portion between the fixing unit 53 and the auxiliary electrode 4. When the auxiliary electrode 4 moves out of the discharge area, when the auxiliary electrode 4 is close to the fixing unit 53, the auxiliary electrode 4 and the fixing unit 53 can be connected to each other to realize the limited fixation of the auxiliary electrode 4.

[0048] Through the above-mentioned electrode displacement device, automatic control of the movement of the auxiliary electrode can be achieved to ensure that the auxiliary electrode is accurately moved into and out of the discharge area without manual intervention. In addition, the electrode displacement device in the embodiment of the present invention can also be provided with a displacement sensor to detect the movement position of the auxiliary electrode to further ensure the accuracy of the auxiliary electrode displacement.

[0049] In a preferred embodiment, the electrode fault identification system may further include: a switching device (not shown), configured to switch the working state and detection state of the electrode to be identified, wherein the working state of the electrode to be identified is a state in which the electrode to be identified discharges in response to a preset working voltage.

[0050] For example, referring to the above, Figure 1 As shown, when the working power supply 1 is started, it applies a working voltage to the first discharge electrode 2 and the second discharge electrode 3. At this time, the first discharge electrode 2 and the second discharge electrode 3 discharge at the preset working voltage, and the discharge state is the working state. Taking the first discharge electrode 2 as an example, when the first discharge electrode 2 needs to be fault-identified, the switching device can switch the first discharge electrode 2 and the second discharge electrode 3 from their working state to the detection state. Specifically, as Figure 2As shown, the first discharge electrode 2 is disconnected from the working power supply 1 and connected to the detection power supply 8, and the second discharge electrode 3 is disconnected from both the working power supply 1 and the detection power supply 8. When the fault of the first discharge electrode 2 is identified and the plasma reactor needs to continue to purify the exhaust gas, the switching device can disconnect the first discharge electrode 2 from the detection power supply 8 and connect it to the working power supply 1, so that the first discharge electrode 2 and the second discharge electrode 3 discharge to purify the exhaust gas, thereby completing the process of switching from the detection state to the working state.

[0051] The switching device includes: a working switch, adapted to provide a working power supply 1 of the preset working voltage, and used to start or exit the working state of the electrode to be identified by controlling the power supply of the working power supply; and a detection switch, adapted to provide a detection power supply (for example, Figure 2 The detection power supply 8 shown, or Figure 3 The working power supply 1) shown is set up to enable the electrode to be identified to start or exit the detection state by controlling the power supply of the detection power supply.

[0052] For example, Figure 4 As shown, the working switch includes a working switch K1 and a working switch K2. The detection switch includes a detection switch K u And detection switch K d When the detection switch K u And detection switch K d When the working switches K1 and K2 are turned on and the working switches K1 and K2 are turned off, the first discharge electrode 2 and the second discharge electrode 3 are in working state under the action of the working power supply 1. If a fault identification detection is to be performed on the first discharge electrode 2, the working switches K1 and K2 are turned on and the detection switch K1 is kept on. d Turn on the detection switch K u The first discharge electrode 2 is closed, and then the first discharge electrode 2 is connected to the detection power supply 8. At this time, the second discharge electrode 3 is disconnected from the working power supply 1 and the detection power supply 8, and the first discharge electrode 2 is in the detection state. Similarly, if the second discharge electrode 3 is to be fault-detected, the working switches K1 and K2 are opened, and the detection switch K is kept u Turn on the detection switch K d The first discharge electrode 2 is in a disconnected state from the working power supply 1 and the detection power supply 8, and the second discharge electrode 3 is in a detection state. In addition, the working switch and the detection switch include but are not limited to intermediate relays, circuit breakers, contactors, IGBTs, GTOs, MOSFETs and other devices with switch functions.

[0053] It should be noted that the above-mentioned configuration of the switching device is only a preferred configuration, and the switching device of the embodiment of the present invention is not limited thereto. Those skilled in the art can also flexibly configure the structure and connection structure of different switching devices according to actual needs to achieve switching between the working state and the detection state.

[0054] In this embodiment, by providing a switching device, the working state and the detection state of the discharge electrode can be switched flexibly in real time to achieve fault detection for any discharge electrode.

[0055] In a preferred embodiment, the electrode fault identification system further includes an alarm device (not shown) for issuing an alarm prompt when the control device 7 determines that the electrode to be identified has a fault or a risk of a fault.

[0056] For example, taking a sound alarm as an example, when the control device 7 determines that the electrode has a fault or a risk of a fault, an alarm sound is emitted to alert the on-site staff. A display alarm method can also be used. Taking a display screen as an example, when the control device 7 determines that the electrode has a fault or a risk of a fault, an alarm word is displayed to prompt the on-site staff to repair the electrode in time.

[0057] In the embodiment of the present invention, an alarm device is provided to promptly notify the staff to carry out maintenance when an electrode fails, thereby ensuring the safety of the operation of the plasma reactor.

[0058] Embodiment 3

[0059] With respect to the above-mentioned electrode fault identification system, the structure and function thereof are further introduced in detail below.

[0060] like Figure 3 As shown, the electrode displacement device 5 may include: a sliding unit 51, including two parallel slides, wherein the plane where the two parallel slides are located is parallel to the plane where the target electrode pair is located and the spacing between the two planes is the preset distance, one of the two parallel slides is embedded in one end of the auxiliary electrode 4 and the other is embedded in the other end of the auxiliary electrode 4; and a driving unit (not shown), used to drive the auxiliary electrode 4 to move along the two parallel slides, so that the auxiliary electrode 4 is parallel to and opposite to the electrode to be identified when it moves to the preset position.

[0061] Among them, when in the preset position, the vertical distance between the auxiliary electrode and the plane where the electrode to be identified is located is the detection gap (and the distance between the electrodes to be identified is the discharge gap, the detection gap and the discharge gap can be the same or different), and the detection gap length g is preferably 1mm-5mm. In other words, the preset distance can be the detection gap.

[0062] Furthermore, the electrode displacement device 5 may also include: a fixing unit 53, which is used to fix the auxiliary electrode 4 outside the area where the electrode in the plasma reactor is located when the auxiliary electrode 4 moves out of the area along the slideway.

[0063] When the auxiliary electrode 4 moves along the parallel track to a preset position directly opposite the electrode to be identified (eg, the first discharge electrode 2), the auxiliary electrode and the electrode to be identified (eg, the first discharge electrode 2) can generate discharge under the action of the detection voltage.

[0064] The driving unit can use a motor or the like to realize the driving control of the auxiliary electrode. The driving unit can control the moving speed and moving direction of the auxiliary electrode 4 on the slideway of the sliding unit 51. Different fixing structures can be used between the fixing unit 53 and the auxiliary electrode 4. For example, the contact part between the fixing unit 53 and the auxiliary electrode 4 can be provided with mutually adapted connecting devices. When the auxiliary electrode 4 moves out of the area where all electrodes are located, when the auxiliary electrode 4 is close to the fixing unit 53, the auxiliary electrode 4 and the fixing unit 53 can be connected to each other to realize the limited fixation of the auxiliary electrode 4.

[0065] Through the above-mentioned electrode displacement device, automatic control of the movement of the auxiliary electrode can be achieved to ensure that the auxiliary electrode is accurately moved into and out of the discharge area without manual intervention. In addition, the electrode displacement device in the embodiment of the present invention can also be provided with a displacement sensor to detect the movement position of the auxiliary electrode to further ensure the accuracy of the auxiliary electrode displacement.

[0066] In a preferred embodiment, the electrode fault identification system may further include: a switching device (not shown), configured to switch the working state and detection state of the electrode to be identified, wherein the working state of the electrode to be identified is a state in which the electrode to be identified discharges in response to a preset working voltage.

[0067] For example, referring to the above, Figure 1 As shown, when the working power supply 1 is started, it applies a working voltage to the first discharge electrode 2 and the second discharge electrode 3. At this time, the first discharge electrode 2 and the second discharge electrode 3 discharge at the preset working voltage, and the discharge state is the working state. Taking the first discharge electrode 2 as an example, when the first discharge electrode 2 needs to be fault-identified, the switching device can switch the first discharge electrode 2 and the second discharge electrode 3 from their working state to the detection state. Specifically, as Figure 3As shown, the first discharge electrode 2 is connected to the positive electrode of the working power supply 1, and the auxiliary electrode 4 is grounded. When the fault of the first discharge electrode 2 is identified, and the plasma reactor needs to continue to purify the exhaust gas, the switching device can cut off the first discharge electrode 2 from the positive electrode of the working power supply 1, ground the first discharge electrode 2, and connect the second discharge electrode 3 to the positive electrode of the working power supply 1, so that the first discharge electrode 2 and the second discharge electrode 3 are discharged to purify the exhaust gas, thereby completing the process of switching from the detection state to the working state.

[0068] The switching device includes: a working switch, adapted to provide a working power supply 1 of the preset working voltage, and used to start or exit the working state of the electrode to be identified by controlling the power supply of the working power supply; and a detection switch, adapted to provide a detection power supply (for example, Figure 2 The detection power supply 8 shown, or Figure 3 The working power supply 1) shown is set up to enable the electrode to be identified to start or exit the detection state by controlling the power supply of the detection power supply.

[0069] For example, Figure 3 As shown, the working switch includes a working switch K1 and a working switch K2. The detection switch includes a detection switch K u When the detection switch K u When the working switches K1 and K2 are turned on and the working switches K1 and K2 are turned off, the first discharge electrode 2 and the second discharge electrode 3 are in working state under the action of the working power supply 1. If a fault identification detection is to be performed on the first discharge electrode 2, the working switches K1 and K2 are turned on and the detection switch K1 is turned off. u , and then the first discharge electrode 2 is connected to the working power supply 1, at this time the second discharge electrode 3 is disconnected from the working power supply 1, and the first discharge electrode 2 is in a detection state. Similarly, if the second discharge electrode 3 is to be fault-detected, the working switches K1 and K2 are turned on, and the working switch K1 is turned off, and then the second discharge electrode 3 is connected to the working power supply 1, at this time the first discharge electrode 2 is disconnected from the working power supply 1, and the second discharge electrode 3 is in a detection state. In addition, the above-mentioned working switches and detection switches include but are not limited to intermediate relays, circuit breakers, contactors, IGBTs, GTOs, MOSFETs and other devices with switching functions.

[0070] It should be noted that the configuration of the switching device described above is only a preferred configuration, and the switching device of the embodiment of the present invention is not limited thereto. For example, the working switch and the detection switch in the second embodiment described above and an additional detection power supply may be used. Those skilled in the art may also flexibly configure the structures and connection structures of different switching devices according to actual needs to achieve switching between the working state and the detection state.

[0071] In this embodiment, by providing a switching device, the working state and the detection state of the discharge electrode can be switched flexibly in real time to achieve fault detection for any discharge electrode.

[0072] In a preferred embodiment, the electrode fault identification system further includes an alarm device (not shown) for issuing an alarm prompt when the control device determines that the electrode to be identified has a fault or a risk of a fault.

[0073] For example, taking the sound alarm as an example, when the control device determines that the electrode has a fault or a risk of a fault, an alarm sound is emitted to alert the on-site staff. A display alarm method can also be used. Taking the display screen as an example, when the control device determines that the electrode has a fault or a risk of a fault, an alarm message is displayed to prompt the on-site staff to repair the electrode in a timely manner.

[0074] In the embodiment of the present invention, an alarm device is provided to promptly notify the staff to carry out maintenance when an electrode fails, thereby ensuring the safety of the operation of the plasma reactor.

[0075] In addition, for each embodiment of the present invention (such as embodiment 2 or embodiment 3), in order not to affect the discharge between the auxiliary electrode and the two discharge electrodes and the identification result of the electrode fault, the electrode displacement device 5 and the auxiliary electrode 4 need to be insulated. When the plasma reactor is in a normal working state, the auxiliary electrode is close to the fixed table (i.e., the initial position, which is at a position far away from the plasma reactor at this time, wherein the far away position refers to a position that has no effect on the normal working discharge of the plasma reactor, preferably 5-10cm); when the plasma reactor is in a detection state, the auxiliary electrode moves to each electrode to be identified in turn, and this process always keeps parallel to the electrode to be identified, that is, the size of the detection gap remains unchanged. The slide rail is in a non-discharge area and does not affect the discharge process of the auxiliary electrode and the electrode to be identified.

[0076] Embodiment 4

[0077] As mentioned in the first embodiment, the present invention identifies electrode faults by using the initial discharge voltage between the auxiliary electrode and the electrode to be identified as a reference. The following is a detailed description of the process of the control device identifying electrode faults based on the initial discharge voltage by using an example.

[0078] The control device is configured to determine whether the electrode to be identified has a fault, including: comparing the starting discharge voltage with the safety threshold interval; and determining that the electrode to be identified has a fault or a risk of fault when the starting discharge voltage is outside the safety threshold interval.

[0079] Wherein, the voltage detection device is further configured to detect the starting discharge voltage reference value of the reference electrode pair under the preset detection environment for multiple times to obtain multiple starting discharge voltage reference values. Wherein, the reference electrode pair is formed by the auxiliary electrode and the unused electrode to be identified with a spacing of the preset distance. Accordingly, the control device is further configured to: sort the multiple starting discharge voltage reference values; remove the data ranked in the top preset ranking and the bottom preset ranking from the multiple starting discharge voltage reference values ​​to obtain the remaining data; and use the minimum value and the maximum value of the remaining data as the minimum value and the maximum value of the safety threshold interval respectively.

[0080] For example, before the plasma reactor is purified, it is necessary to obtain the initial discharge voltage of the electrode under normal conditions as the electrode state determination parameter: that is, the determination parameter U of the initial discharge voltage SH and U SL , U SH and U SL are the maximum and minimum values ​​of the safety threshold interval respectively. The specific process is: the auxiliary electrode moves parallel to the slide rail of the electrode displacement device, stops at the opposite side of the electrode to be identified, controls the working power supply to increase the voltage, obtains the starting discharge voltage at the time when the discharge starts between the electrode to be identified and the auxiliary electrode, then controls the working power supply to reduce the voltage to 0, continues to increase the voltage in a similar way to obtain another starting discharge voltage data, repeats this step, obtains n starting discharge voltage data, sorts by voltage, removes the first 1 / 10 and the last 1 / 10 data (rounds down), and assigns the maximum value U SH , the minimum value is U SL , thereby obtaining the electrode state determination parameter (i.e., the safety threshold interval). The determination of the electrode state determination parameter (i.e., the safety threshold interval) needs to be performed under a preset detection environment (such as the gas type, gas humidity, and gas flow rate of the electrode), and the process of detecting the starting discharge voltage in the aforementioned embodiments is also performed under the same preset detection environment. If the environmental parameters change, the electrode state determination parameter (i.e., the safety threshold interval) needs to be re-obtained.

[0081] Specifically, the control device is configured to determine whether the electrode to be identified has a fault or a risk of fault, including: when the starting discharge voltage is greater than the maximum value of the safety threshold interval, it is determined that the dielectric layer of the electrode to be identified is damaged and the internal metal is completely exposed; when the starting discharge voltage is greater than or equal to the first preset value and less than the minimum value of the safety threshold interval, it is determined that the dielectric surface of the electrode to be identified has a risk of coking, liquid water adhesion, cracks or damage; when the starting discharge voltage is less than the first preset value, it is determined that a large amount of coking exists on the dielectric surface of the electrode to be identified. Wherein, the first preset value is a preset ratio of the minimum value of the safety threshold interval.

[0082] Below Figure 3 The electrode fault identification system shown in FIG. 1 is used as an example to illustrate the fault identification process of the first discharge electrode 2 and the second discharge electrode 3 in the target electrode pair in the electrode fault identification system. Figure 5 shown.

[0083] When the plasma reactor is in normal working state, the working switches K1 and K2 are in closed state, and the detection switch K u In the disconnected state, the working power source drives each electrode to work normally. At this time, the voltage applied to each electrode is alternately positive and negative, and plasma is generated in the discharge gap between adjacent electrodes. The auxiliary electrode is in the initial position at this time and does not interfere with the normal operation of each electrode.

[0084] Step S1: The plasma reactor enters a detection state.

[0085] When the plasma reactor enters the detection state, the environment parameters and detection gap length g are set to be the same as the environment parameters and gap length for obtaining the electrode state judgment parameters. When switching from the normal working state to the detection state, first disconnect the working switches K1 and K2, and then close the detection switch K u And working switch K1. In the whole detection state, working switch K2 is in the disconnected state, and detection switch K u And the working switch K1 is in the closed state, and the size of the detection gap remains unchanged.

[0086] Step S2: The auxiliary electrode is moved to the position opposite to the first electrode to be identified.

[0087] When the detection starts, the auxiliary electrode moves parallel to the slide rail of the electrode displacement device and stops right opposite to the first electrode to be identified (for example, electrode 3).

[0088] Step S3: Obtain the starting discharge voltage measurement value Us.

[0089] Control the working power supply to increase the voltage to obtain the starting discharge voltage, then control the working power supply to reduce the voltage to 0, and continue to increase the voltage to obtain another starting discharge voltage data, repeat this step to obtain n starting discharge voltage data. After sorting by voltage, remove the first 1 / 10 and the last 1 / 10 of the data (round down), and take the average of the remaining data to obtain the starting discharge voltage measurement value U S .

[0090] Step S4: Determine U S >U SH Is it established? If so, execute step S5; otherwise, execute step S6.

[0091] Step S5: The current electrode has a fault.

[0092] Step S6: Determine U S SH Is it established? If so, execute step S7; otherwise, execute step S9.

[0093] Step S7: Determine U S <0.8U SL Is it established? If so, execute step S5; otherwise, execute step S8.

[0094] Step S8: There is a risk of failure of the current electrode.

[0095] Step S9: The current electrode is normal.

[0096] Through the above steps S4-S9, the starting discharge voltage measurement value U S and the decision parameter U SH and U SL Compare to determine the state of this electrode (for example, electrode 3):

[0097] When U S >U SH When the current electrode (for example, electrode 3) is judged to be faulty, the dielectric layer is damaged, and the metal inside the electrode is completely exposed, and the electrode is marked as a faulty electrode;

[0098] When 0.8U SL ≤U S SL When the current electrode is judged to have a fault risk, there may be coking, liquid water attached, cracks or damage on the medium surface, and the electrode is marked as a high-risk electrode;

[0099] When U S <0.8U SL When the system determines that the current electrode is faulty and there is a lot of coking on the medium surface, the electrode is marked as a faulty electrode. ​​

[0100] When U SL ≤U S ≤U SH , the system considers that the current electrode is normal.

[0101] Step S10: Determine whether all electrodes have completed detection. If so, execute step S12; otherwise, execute step S11.

[0102] Step S11: The auxiliary electrode moves to the position opposite to the next electrode to be identified.

[0103] Step S12: Output all electrode status information.

[0104] After obtaining the first electrode status information, the electrode displacement device drives the auxiliary electrode to translate to the opposite side of the second electrode to be identified, and repeats the above process until all the electrode status information to be identified is obtained. Finally, all the electrode status information to be identified is output by the control device to the upper computer display screen or indicator light.

[0105] After the detection is completed, the auxiliary electrode returns to its initial position. After all electrodes to be identified are free of faults, the detection state can be restored to the normal working state manually or by the control device. When switching from the detection state to the normal working state, first disconnect the detection switch K u and the working switch K1, and then close the working switches K1 and K2.

[0106] In addition, the electrode fault identification method in the above-mentioned embodiments can be extended to a plasma reactor including any of the following forms of electrodes, such as plate-plate electrodes, wire-plate electrodes, row-tube electrodes, coaxial cylindrical electrodes, etc.

[0107] When dielectric barrier discharge is used in the process of waste gas treatment, coking, water immersion, breakage, etc. often occur. When these electrode faults occur, relying solely on the overvoltage and overcurrent protection on the main circuit cannot accurately identify the electrode fault. In view of this defect, the electrode fault identification system provided by the present invention can achieve the following beneficial effects: 1. Through the joint control of the auxiliary electrode displacement device, the detection switch and the working switch, the plasma electrode working state and the detection state can be quickly switched; 2. Introducing an auxiliary electrode that does not participate in the degradation discharge for diagnosis can avoid the misjudgment caused by the discharge electrode diagnosis, which can greatly improve the accuracy of diagnosis and achieve effective distinction and reliable judgment of faults; 3. It overcomes the disadvantages of traditional periodic shutdown detection, realizes targeted cleaning or replacement of electrodes, inhibits the expansion of electrode faults, and improves the safety and reliability of the system.

[0108] Each embodiment of the present invention provides a plasma electrode detection system with accurate fault judgment, and proposes a judgment method that can effectively identify the type and degree of fault. The detection system has a simple structure and is highly compatible with the plasma reactor. It can quickly switch between the working state and the detection state. It does not require time-consuming and laborious disassembly and assembly of the reactor, and can conveniently detect any electrode, reducing the cycle and cost of manual maintenance. This method improves the accuracy of fault identification by comparing the changes in the starting discharge voltage of the detection electrode and the electrode to be tested during the discharge process. According to the range of change of the difference, the fault type and degree of the electrode can be accurately determined, avoiding the unreliability of human judgment and ensuring the long-term stable operation of the device.

[0109] The electrode fault identification system or method provided by the above-mentioned embodiments of the present invention can be used in the fields of plasma organic waste gas treatment, material surface modification, metal etching, sewage treatment, etc., especially in industries such as petrochemicals and municipal sewage that emit organic waste gas with complex components and large treatment volume. The electrode fault identification system or method is simple and reliable, and can improve the existing plasma industrial processing equipment. Without disassembling the reactor, it can conveniently and accurately identify the plasma electrode fault effectively, avoiding the unreliability of human judgment and the time-consuming and labor-intensive manual maintenance, greatly reducing the maintenance cost of the device, and effectively ensuring the operating stability of the device. Therefore, it has a high engineering application value.

[0110] In summary, the present invention creatively can realize fault detection of any electrode without disassembling the plasma reactor, and introduces the variable of starting discharge voltage to identify electrode faults, which is more accurate and reliable than manual judgment, and reduces the cycle and cost of manual maintenance, thereby effectively ensuring the long-term stable operation of the plasma reactor.

[0111] Embodiment 5

[0112] An embodiment of the present invention provides an electrode fault identification method, which is performed based on an auxiliary electrode, wherein the auxiliary electrode can be moved to a preset position at a preset distance from an electrode to be identified in a target electrode pair in a plasma reactor, and the auxiliary electrode at the preset position and the electrode to be identified form an electrode pair to be identified, and the electrode fault identification method includes: detecting a starting discharge voltage of the electrode pair to be identified under a preset detection environment when the electrode to be identified in the electrode pair to be identified is in a detection state and the auxiliary electrode is moved to the preset position, wherein the detection state refers to a state in which the electrode to be identified discharges in response to the starting discharge voltage; and determining whether the electrode to be identified has a fault based on the starting discharge voltage and a safety threshold interval.

[0113] For specific details and benefits of the electrode fault identification method provided by the embodiment of the present invention, please refer to the above description of the electrode fault identification system, which will not be repeated here.

[0114] Embodiment 6

[0115] This embodiment provides an electrode fault identification system, which comprises an auxiliary electrode 4, an electrode displacement device 5, a detection switch K u , working switches K1, K2 and control devices. The system diagram is as follows Figure 3 shown.

[0116] Among them, the auxiliary electrode 4 has the same structure as the electrode to be identified. The metal inside the electrode can be composed of metals such as iron, copper, tungsten, etc., the blocking medium on the surface can be composed of quartz, ceramics and nylon, etc., and the electrode shape can be a tubular structure or a plate structure. The metal electrode material is preferably iron, and the blocking medium is preferably quartz. The electrode to be identified is the discharge electrode for normal plasma operation, which is used to realize the normal function of the plasma reactor. The auxiliary electrode will only move from the initial position under the detection state. When the system is in normal working state, the working switches K1 and K2 are in a closed state, and the detection switch K u In the disconnected state, the auxiliary electrode 4 is at an initial position far from the discharge electrode (preferably 5-10 cm away) and is connected to the ground potential of the working power supply. When the system is in the detection state, the working switches K1 and K2 are disconnected, and the detection switch K u When closed, the electrode displacement device 5 drives the auxiliary electrode 4 to move to perform electrode detection.

[0117] Among them, the electrode displacement device 5 can make the auxiliary electrode 4 move parallel to the plane where the electrode to be identified is located, wherein the vertical distance between the auxiliary electrode 4 and the plane where the electrode to be identified is located is the detection gap g, and the detection gap length g is preferably 1mm-5mm; the distance between the electrodes to be identified is the discharge gap, and the length can be 0.5-8mm, preferably 1mm-5mm. The auxiliary electrode 4 is embedded in the slide rail and moves in the slide rail. The entire electrode displacement device 5 is insulated from the auxiliary electrode 4; the auxiliary electrode 4 is grounded, and the movement of the auxiliary electrode 4 is driven by a motor and controlled by a control device. When the plasma reactor is in normal working state, the auxiliary electrode 4 is close to the fixed table, that is, the initial position; when in the detection state, the auxiliary electrode 4 moves to each electrode to be identified in turn, and this process always remains parallel to the electrode to be identified, that is, the size of the detection gap remains unchanged. The slide rail is in the non-discharge area and does not affect the discharge process of the auxiliary electrode and the discharge electrode.

[0118] The working power supply 1 is used to drive plasma discharge between the electrodes to be identified when the plasma reactor is in a normal working state; and is used to drive plasma discharge between the auxiliary electrode and the electrode to be identified when the plasma reactor is in a detection state. The output waveform of the working power supply 1 includes an AC power supply, a pulse power supply, etc., preferably an AC power supply.

[0119] The functions of the detection switch and the working switch are: when the working switch is turned on and the detection switch is closed, the electrode to be identified can be quickly switched from the working state to the detection state; when the working switch is closed and the detection switch is turned on, the electrode to be identified can be quickly switched from the detection state to the working state. The detection switch and the working switch include but are not limited to intermediate relays, circuit breakers, contactors, IGBTs, GTOs, MOSFETs and other devices with switching functions.

[0120] Among them, the functions of the control device are: 1. Control the start and stop of the working power supply and the on and off of the detection switch and the working switch, so that the system switches between the working state and the detection state. The switching time from the normal working state to the detection state can be manually controlled, or it can be automatically switched by presetting the regular detection time, or it can be coupled with other judgment logic of the system; 2. Control the electrode displacement device to make the auxiliary electrode move to the preset position in turn, and detect the state of each electrode to be identified; 3. According to the variation range of the starting discharge voltage of each electrode to be identified measured under the detection state, output the operation status of the discharge electrode and give an alarm or fault signal. The chip of the data collection and control device can be used but not limited to single-chip microcomputer, DSP, PLC, etc. The components in the electrode fault identification system can use but not limited to the following communication methods 485, 232, CAN, and the signal line should have the ability to shield high-frequency electromagnetic interference. The control device has the ability to feedback the system status and display the current status, which can be realized by the upper computer display screen, indicator light, etc.

[0121] Embodiment 7

[0122] According to the electrode fault identification system in the sixth embodiment, this embodiment provides an electrode fault identification method, which is described in detail as follows.

[0123] The plasma reactor adopts a row-tube structure, and the discharge gap and measurement gap of the electrode tube are both 3.6mm. The size of the discharge disk is 50cm*30cm, including 21 electrodes in a row, with high-voltage electrodes and ground electrodes staggered. The length and diameter of each electrode are 36cm and 1cm respectively. The electrode tube is made of quartz, and the conductor inside the electrode tube is an iron rod. Before the plasma sub-reactor leaves the factory, the starting discharge voltage of the electrode under normal conditions is obtained as the electrode state judgment parameter, that is, the judgment parameter U of the starting discharge voltage SH and U SLThe specific process is as follows: the auxiliary electrode 4 moves parallel to the slide rail of the electrode displacement device 5 and stops opposite to the electrode to be identified which is normal; the working power supply 1 is controlled to increase the voltage to obtain the starting discharge voltage, and then the working power supply 1 is controlled to reduce the voltage to 0, and then the voltage is increased to obtain another starting discharge voltage data, and this step is repeated to obtain 10 starting discharge voltage data; after sorting by voltage, the first and last data are removed, and the maximum value is assigned as U SH , the minimum value is U SL , thus obtaining the electrode state judgment parameter U SH =26kV, U SL =24.8kV.

[0124] When the plasma reactor is in normal working state, the working switches K1 and K2 are in closed state, and the detection switch K u In the disconnected state, the working power supply 1 drives the electrodes to be identified to work normally. At this time, the voltage applied to each electrode to be identified is alternately positive and negative, and plasma is generated in the discharge gap between adjacent electrodes. The auxiliary electrode 4 is in the initial position at this time and does not interfere with the normal operation of the electrodes to be identified;

[0125] When the plasma reactor enters the detection state, the environmental parameters and detection gap length g are set to be the same as the environmental parameters and detection gap length g used to obtain the electrode state judgment parameters. When switching from the normal working state to the detection state, first disconnect the working switches K1 and K2, and then close the detection switch K u And working switch K1. In the whole detection state, working switch K2 is in the disconnected state, and detection switch K u And the working switch K1 is in the closed state, and the size of the detection gap remains unchanged.

[0126] At the beginning of the detection, the auxiliary electrode 4 moves parallel to the slide rail of the electrode displacement device 5 and stops opposite to the first electrode to be identified; the working power supply 1 is controlled to increase the voltage to obtain the starting discharge voltage, and then the working power supply is controlled to reduce the voltage to 0, and then the voltage is increased to obtain another starting discharge voltage data, and this step is repeated to obtain n starting discharge voltage data; after sorting by voltage size, the first 1 / 10 and the last 1 / 10 of the data are removed (rounded down), and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0127] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL Compare to determine the state of this electrode:

[0128] When U S >U SHWhen the system determines that the current electrode is faulty, the dielectric layer is damaged, and the metal inside the electrode is completely exposed, the electrode is marked as a faulty electrode;

[0129] When 0.8U SL ≤U S SL When the system determines that the current electrode has a risk of failure, there may be coking, liquid water attached to the surface of the medium, cracks or damage, etc., and the electrode is marked as a high-risk electrode;

[0130] When U S <0.8U SL When the system determines that the current electrode is faulty and there is a lot of coking on the medium surface, the electrode is marked as a faulty electrode.

[0131] When U SL ≤U S ≤U SH , the system considers the current electrode to be normal.

[0132] After obtaining the state information of the first electrode, the electrode displacement device 5 drives the auxiliary electrode 4 to translate to the opposite side of the second electrode to be identified, and repeats the above process until the state information of all electrodes to be identified is obtained. Finally, the state information of all electrodes to be identified is output by the control device to the upper computer display screen or indicator light.

[0133] After the detection is completed, the auxiliary electrode 4 returns to its initial position. After all electrodes to be identified are free of faults, the detection state can be restored to the normal working state manually or by the control device. When switching from the detection state to the normal working state, first disconnect the detection switch K u and the working switch K1, and then close the working switches K1 and K2.

[0134] Embodiment 8 (Example involving complete exposure of metal inside the electrode)

[0135] According to the electrode fault identification system in the sixth embodiment, this embodiment provides an electrode fault identification method, which is described in detail as follows.

[0136] In the embodiment of the present invention, the exhaust gas contains propylene with a concentration of 300-380 ppm and a gas volume of 400 m 3 / h. In the process of propylene degradation, the coking on the electrode tube surface is not obvious.

[0137] When the plasma reactor is in normal working state, the working switches K1 and K2 are in closed state, and the detection switch K u ​In the disconnected state, the working power supply 1 drives the electrodes to be identified to work normally. At this time, the voltage applied to each electrode to be identified is alternately positive and negative, and plasma is generated in the discharge gap between adjacent electrodes. The auxiliary electrode 4 is in the initial position at this time and does not interfere with the normal operation of the electrodes to be identified.

[0138] When the plasma reactor is controlled to switch from the normal working state to the detection state, the environmental parameters and the detection gap g are set to be the same as the environmental parameters and the detection gap for obtaining the electrode state judgment parameters, and the working switches K1 and K2 are first opened, and then the detection switch K is closed. u And working switch K1. In the whole detection state, working switch K2 is in the disconnected state, and detection switch K u And the working switch K1 is in the closed state.

[0139] At the beginning of the detection, the auxiliary electrode 4 moves parallel to the slide rail of the electrode displacement device 5 and stops opposite to the first electrode to be identified. The working power supply 1 is controlled to increase the voltage to obtain the starting discharge voltage. Then the working power supply 1 is controlled to reduce the voltage to 0, and the voltage is increased again to obtain another starting discharge voltage data. This step is repeated to obtain 10 starting discharge voltage data. After sorting by voltage, the first and last data are removed, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0140] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL After obtaining the first electrode status information, the electrode displacement device 5 drives the auxiliary electrode 4 to translate to the opposite side of the second electrode to be identified, and repeats the above process until all the electrode status information to be identified is obtained. S =27kV>U SH =26kV, the system determines that the current electrode is faulty, the dielectric layer is damaged, and the metal inside the electrode is completely exposed, and marks this electrode as a faulty electrode.

[0141] After the detection is completed, the auxiliary electrode 4 is restored to the initial position, and the faulty electrode is replaced and the detection is repeated. S Meet U SL ≤U S ≤U SH , first disconnect the detection switch K u and the working switch K1, and then close the working switches K1 and K2 to restore the detection state to the normal working state.

[0142] Embodiment 9 (Example involving electrode coking)

[0143] According to the electrode fault identification system in the sixth embodiment, this embodiment provides an electrode fault identification method, which is described in detail as follows.

[0144] In the embodiment of the present invention, the exhaust gas contains toluene, with a concentration of 240-380 ppm and a gas volume of 300 m 3 / h. During the degradation of toluene, coke gradually accumulates on the surface of the electrode tube.

[0145] When the plasma reactor is in normal working state, the working switches K1 and K2 are in closed state, and the detection switch K u In the disconnected state, the working power source drives each electrode to work normally. At this time, the voltage applied to each electrode is alternately positive and negative, and plasma is generated in the discharge gap between adjacent electrodes. The auxiliary electrode is in the initial position at this time and does not interfere with the normal operation of each electrode.

[0146] When the plasma reactor is controlled to switch from the normal working state to the detection state, the environmental parameters and the detection gap g are set to be the same as the environmental parameters and the detection gap for obtaining the electrode state judgment parameters, and the working switches K1 and K2 are first opened, and then the detection switch K is closed. u And working switch K1. In the whole detection state, working switch K2 is in the disconnected state, and detection switch K u And the working switch K1 is in the closed state.

[0147] At the beginning of the detection, the auxiliary electrode 4 moves parallel to the slide rail of the electrode displacement device 5 and stops opposite to the first electrode to be identified. The working power supply 1 is controlled to increase the voltage to obtain the starting discharge voltage. Then the working power supply 1 is controlled to reduce the voltage to 0, and the voltage is increased again to obtain another starting discharge voltage data. This step is repeated to obtain 10 starting discharge voltage data. After sorting by voltage, the first and last data are removed, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0148] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL After obtaining the first electrode status information, the electrode displacement device 5 drives the auxiliary electrode 4 to translate to the opposite side of the second electrode to be identified, and repeats the above process until all the electrode status information to be identified is obtained. Finally, it is measured that the 2nd to 5th root canal, the 8th root canal, and the 15th to 20th root canal have 0.8U SL ≤U S SL At this time, the system determines that there may be coking, liquid water attached, cracks or damage on the surface of the current electrode medium, and marks these electrodes as high-risk electrodes;​

[0149] It is determined that all electrodes to be identified do not have faults at this time, that is, all electrodes to be identified U S Meet 0.8U SL ≤U S ≤U SH After the test is completed, the auxiliary electrode returns to its initial position. First disconnect the test switch K u and the working switch K1, and then close the working switches K1 and K2 to restore the detection state to the normal working state.

[0150] Example 10 (Example involving liquid water attached to the electrode surface)

[0151] According to the electrode fault identification system in the sixth embodiment, this embodiment provides an electrode fault identification method, which is described in detail as follows.

[0152] In the embodiment of the present invention, the exhaust gas contains formaldehyde with a concentration of 170-200 ppm and a gas volume of 320 m 3 / h. During the degradation process, coking on the electrode tube surface is not obvious.

[0153] When the plasma reactor is in normal working state, the working switches K1 and K2 are in closed state, and the detection switch K u In the disconnected state, the working power supply 1 drives the electrodes to be identified to work normally. At this time, the voltage applied to each electrode to be identified is alternately positive and negative, and plasma is generated in the discharge gap between adjacent electrodes. The auxiliary electrode 4 is in the initial position at this time and does not interfere with the normal operation of the electrodes to be identified.

[0154] When the plasma reactor is controlled to switch from the normal working state to the detection state, the environmental parameters and the detection gap g are set to be the same as the environmental parameters and the detection gap for obtaining the electrode state judgment parameters, and the working switches K1 and K2 are first opened, and then the detection switch K is closed. u And working switch K1. In the whole detection state, working switch K2 is in the disconnected state, and detection switch K u And the working switch K1 is in the closed state.

[0155] At the beginning of the detection, the auxiliary electrode 4 moves parallel to the slide rail of the electrode displacement device 5 and stops opposite to the first electrode to be identified. The working power supply 1 is controlled to increase the voltage to obtain the starting discharge voltage. Then the working power supply 1 is controlled to reduce the voltage to 0, and the voltage is increased again to obtain another starting discharge voltage data. This step is repeated to obtain 10 starting discharge voltage data. After sorting by voltage, the first and last data are removed, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0156] The starting discharge voltage measurement value US and the decision parameter U SH and U SL After obtaining the first electrode status information, the electrode displacement device 5 drives the auxiliary electrode 4 to translate to the opposite side of the second electrode to be identified, and repeats the above process until all the electrode status information to be identified is obtained. Finally, it is measured that there are 0.8U in the 1st to 5th root canals. SL ≤U S SL At this time, the system determines that there may be coking, liquid water attached, cracks or damage on the surface of the current electrode medium, and marks these electrodes as high-risk electrodes.

[0157] It is determined that all electrodes to be identified do not have faults at this time, that is, all electrodes to be identified U S Meet 0.8U SL ≤U S ≤U SH After the test is completed, the auxiliary electrode returns to its initial position. First disconnect the test switch K u and the working switch K1, and then close the working switches K1 and K2 to restore the detection state to the normal working state.

[0158] After 10 days of continuous operation, the system enters the detection state again. When the control and plasma reactor are switched from the normal working state to the detection state, the environmental parameters and detection gap g are set to be the same as those for obtaining the electrode state judgment parameters, and the working switches K1 and K2 are first disconnected, and then the detection switch K is closed. u And working switch K1. In the whole detection state, working switch K2 is in the disconnected state, and detection switch K u And the working switch K1 is in the closed state.

[0159] At the beginning of the detection, the auxiliary electrode 4 moves parallel to the slide rail of the electrode displacement device 5 and stops opposite to the first electrode to be identified. The working power supply 1 is controlled to increase the voltage to obtain the starting discharge voltage. Then the working power supply 1 is controlled to reduce the voltage to 0, and the voltage is increased again to obtain another starting discharge voltage data. This step is repeated to obtain 10 starting discharge voltage data. After sorting by voltage, the first and last data are removed, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0160] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL ​After obtaining the state information of the first electrode, the electrode displacement device 5 drives the auxiliary electrode 4 to translate to the opposite side of the second electrode to be identified, and repeats the above process until the state information of all electrodes to be identified is obtained. SL ≤U S ≤U SH , the system now judges that the electrode is in good condition.

[0161] After the detection is completed, the auxiliary electrode 4 returns to its initial position, and the detection switch K is disconnected first. u and the working switch K1, and then close the working switches K1 and K2 to restore the detection state to the normal working state.

[0162] Example 11 (Example involving cracks on the electrode surface)

[0163] According to the electrode fault identification system in the sixth embodiment, this embodiment provides an electrode fault identification method, which is described in detail as follows.

[0164] In the embodiment of the present invention, the exhaust gas contains ethylene with a concentration of 380-440 ppm and a gas volume of 400 m 3 / h. In the process of ethylene degradation, the coking on the electrode tube surface is not obvious.

[0165] When the plasma reactor is in normal working state, the working switches K1 and K2 are in closed state, and the detection switch K u In the disconnected state, the working power source drives each electrode to work normally. At this time, the voltage applied to each electrode is alternately positive and negative, and plasma is generated in the discharge gap between adjacent electrodes. The auxiliary electrode is in the initial position at this time and does not interfere with the normal operation of each electrode.

[0166] When the plasma reactor is controlled to switch from the normal working state to the detection state, the environmental parameters and the detection gap g are set to be the same as the environmental parameters and the detection gap for obtaining the electrode state judgment parameters, and the working switches K1 and K2 are first opened, and then the detection switch K is closed. u And working switch K1. In the whole detection state, working switch K2 is in the disconnected state, and detection switch K u And the working switch K1 is in the closed state.

[0167] At the beginning of the detection, the auxiliary electrode 4 moves parallel to the slide rail of the electrode displacement device 5 and stops opposite to the first electrode to be identified. The working power supply 1 is controlled to increase the voltage to obtain the starting discharge voltage. Then the working power supply 1 is controlled to reduce the voltage to 0, and the voltage is increased again to obtain another starting discharge voltage data. This step is repeated to obtain 10 starting discharge voltage data. After sorting by voltage, the first and last data are removed, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0168] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL After obtaining the first electrode status information, the electrode displacement device 5 drives the auxiliary electrode 4 to translate to the opposite side of the second electrode to be identified, and repeats the above process until all the electrode status information to be identified is obtained. Finally, it is measured that the second and ninth tubes have 0.8U SL ≤U S SL At this time, the system determines that there may be coking, liquid water attached, cracks or damage on the surface of the current electrode medium, and marks these electrodes as high-risk electrodes.

[0169] After the test is completed, the auxiliary electrode 4 is restored to its initial position, and the high-risk electrode is replaced and tested again. S Meet U SL ≤U S ≤U SH , first disconnect the detection switch K u and the working switch K1, and then close the working switches K1 and K2 to restore the detection state to the normal working state.

[0170] Example 12 (Example involving large amount of coking of electrodes)

[0171] According to the electrode fault identification system in the sixth embodiment, this embodiment provides an electrode fault identification method, which is described in detail as follows.

[0172] In the embodiment of the present invention, the exhaust gas component is toluene, the concentration is 300-680ppm, and the gas volume is 300m 3 / h. During the degradation of toluene, coke gradually accumulates on the surface of the electrode tube.

[0173] When the plasma reactor is in normal working state, the working switches K1 and K2 are in closed state, and the detection switch K u ​In the disconnected state, the working power source drives each electrode to work normally. At this time, the voltage applied to each electrode is alternately positive and negative, and plasma is generated in the discharge gap between adjacent electrodes. The auxiliary electrode is in the initial position at this time and does not interfere with the normal operation of each electrode.

[0174] When the plasma reactor is controlled to switch from the normal working state to the detection state, the environmental parameters and the detection gap g are set to be the same as the environmental parameters and the detection gap for obtaining the electrode state judgment parameters, and the working switches K1 and K2 are first opened, and then the detection switch K is closed. u And working switch K1. In the whole detection state, working switch K2 is in the disconnected state, and detection switch K u And the working switch K1 is in the closed state.

[0175] At the beginning of the detection, the auxiliary electrode 4 moves parallel to the slide rail of the electrode displacement device 5 and stops opposite to the first electrode to be identified. The working power supply 1 is controlled to increase the voltage to obtain the starting discharge voltage. Then the working power supply 1 is controlled to reduce the voltage to 0, and the voltage is increased again to obtain another starting discharge voltage data. This step is repeated to obtain 10 starting discharge voltage data. After sorting by voltage, the first and last data are removed, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0176] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL After obtaining the first electrode status information, the electrode displacement device 5 drives the auxiliary electrode 4 to translate to the opposite side of the second electrode to be identified, and repeats the above process until all the electrode status information to be identified is obtained. Finally, it is measured that the 2nd to 5th root canal and the 10th to 16th root canal have 0.8U SL ≤U S SL At this time, the system determines that there may be coking, liquid water, cracks or damage on the surface of the current electrode medium, and marks these electrodes as high-risk electrodes. After the detection is completed, the auxiliary electrode 4 returns to its initial position. First disconnect the detection switch K u and the working switch K1, and then close the working switches K1 and K2 to restore the detection state to the normal working state.

[0177] After 30 days of continuous operation, the system enters the detection state again. When the control and plasma reactor are switched from the normal working state to the detection state, the environmental parameters and detection gap g are set to be the same as those for obtaining the electrode state judgment parameters, and the working switches K1 and K2 are first disconnected, and then the detection switch K is closed. u ​And working switch K1. In the whole detection state, working switch K2 is in the disconnected state, and detection switch K u And the working switch K1 is in the closed state.

[0178] At the beginning of the detection, the auxiliary electrode 4 moves parallel to the slide rail of the electrode displacement device 5 and stops opposite to the first electrode to be identified. The working power supply 1 is controlled to increase the voltage to obtain the starting discharge voltage. Then the working power supply 1 is controlled to reduce the voltage to 0, and the voltage is increased again to obtain another starting discharge voltage data. This step is repeated to obtain 10 starting discharge voltage data. After sorting by voltage, the first and last data are removed, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0179] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL After obtaining the first electrode status information, the electrode displacement device 5 drives the auxiliary electrode 4 to translate to the opposite side of the second electrode to be identified, and repeats the above process until all the electrode status information to be identified is obtained. Finally, it is measured that the 2nd to 20th root canals all have U S <0.8U SL At this time, the system determines that the electrode is faulty and there may be a lot of coking on the surface of the medium, and marks these electrodes as faulty electrodes;

[0180] After the detection is completed, the auxiliary electrode 4 is restored to the initial position, and the electrodes to be identified are cleaned as a whole and then re-detected. S Meet U SL ≤U S ≤U SH , first disconnect the detection switch K u and the working switch K1, and then close the working switches K1 and K2 to restore the detection state to the normal working state.

[0181] Embodiment 13

[0182] An embodiment of the present invention provides a machine-readable storage medium, on which instructions are stored, and the instructions are used to enable a machine to execute the above-mentioned electrode fault identification method.

[0183] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0184] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0185] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0186] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An electrode fault identification system, characterized in that: The electrode fault identification system comprises: Auxiliary electrode; An electrode displacement device is configured to move the auxiliary electrode to a preset position at a preset distance from an electrode to be identified in a target electrode pair in the plasma reactor, wherein the auxiliary electrode at the preset position and the electrode to be identified form an electrode pair to be identified; a voltage detection device configured to detect a starting discharge voltage of the electrode pair to be identified under a preset detection environment when the electrode to be identified is in a detection state and the auxiliary electrode moves to the preset position, wherein the detection state refers to a state in which the electrode to be identified discharges in response to the starting discharge voltage; and The control device is configured to determine whether the electrode to be identified has a fault according to the starting discharge voltage and a safety threshold range.

2. The electrode fault identification system according to claim 1, characterized in that: The electrode displacement device comprises: a sliding unit, comprising a slideway penetrating inside and outside of a discharge region of the target electrode pair, and the slideway is used to embed the auxiliary electrode; and The driving unit is used to drive the auxiliary electrode to move along the slideway so that the auxiliary electrode is parallel to and opposite to the electrode to be identified when it moves to the preset position in the discharge area.

3. The electrode fault identification system according to claim 2, characterized in that: The electrode displacement device also includes: A fixing unit is used to fix the auxiliary electrode outside the discharge area when the auxiliary electrode moves out of the discharge area along the slideway.

4. The electrode fault identification system according to claim 1, characterized in that: The electrode displacement device comprises: A sliding unit, comprising two parallel slideways, wherein the planes where the two parallel slideways are located are parallel to the plane where the target electrode pair is located and the distance between the two planes is the preset distance, one of the two parallel slideways is embedded in one end of the auxiliary electrode and the other is embedded in the other end of the auxiliary electrode; and The driving unit is used to drive the auxiliary electrode to move along the two parallel slideways, so that the auxiliary electrode is parallel to and opposite to the electrode to be identified when it moves to the preset position.

5. The electrode fault identification system according to claim 1, characterized in that: The control device is configured to determine whether the electrode to be identified fails, including: Comparing the starting discharge voltage with the safety threshold interval; and When the initial discharge voltage is outside the safety threshold range, it is determined that the electrode to be identified has a fault or a risk of a fault.

6. The electrode fault identification system according to claim 5, characterized in that: The control device is configured to determine that the electrode to be identified has a fault or a risk of fault, including: When the initial discharge voltage is greater than the maximum value of the safety threshold range, it is determined that the dielectric layer of the electrode to be identified is damaged and the internal metal is completely exposed; When the starting discharge voltage is greater than or equal to the first preset value and less than the minimum value of the safety threshold interval, it is determined that there is a risk of coking, liquid water adhering, cracks or damage on the medium surface of the electrode to be identified; When the starting discharge voltage is less than the first preset value, it is determined that a large amount of coking exists on the medium surface of the electrode to be identified, wherein the first preset value is a preset ratio of the minimum value of the safety threshold interval.

7. The electrode fault identification system according to claim 5, characterized in that: The voltage detection device is further configured to detect the starting discharge voltage reference value of the reference electrode pair under the preset detection environment for multiple times to obtain multiple starting discharge voltage reference values, wherein the reference electrode pair is formed by the auxiliary electrode and the unused electrode to be identified with a spacing of the preset distance, and The control device is also configured to: sorting the plurality of starting discharge voltage reference values; Removing data ranked in a top preset ranking and a bottom preset ranking from the plurality of start discharge voltage reference values ​​to obtain remaining data; and The minimum value and the maximum value in the remaining data are respectively used as the minimum value and the maximum value of the safety threshold interval.

8. The electrode fault identification system according to claim 1, characterized in that: The electrode fault identification system also includes: The switching device is configured to switch the working state and the detection state of the electrode to be identified, wherein the working state of the electrode to be identified is a state in which the electrode to be identified discharges in response to a preset working voltage.

9. The electrode fault identification system according to claim 8, characterized in that: The switching device comprises: A working switch, adapted to provide a working power supply setting of the preset working voltage, for enabling the electrode to be identified to start or exit the working state by controlling the power supply of the working power supply; and The detection switch is adapted to provide a detection power supply setting of the starting discharge voltage, and is used to enable the electrode to be identified to start or exit the detection state by controlling the power supply of the detection power supply.

10. The electrode fault identification system according to claim 1, characterized in that: The electrode fault identification system also includes: An alarm device is used to issue an alarm prompt when the control device determines that the electrode to be identified has a fault or a risk of a fault.

11. A method for identifying electrode faults, characterized in that: The electrode fault identification method is performed based on an auxiliary electrode, wherein the auxiliary electrode can be moved to a preset position at a preset distance from an electrode to be identified in a target electrode pair in a plasma reactor, and the auxiliary electrode at the preset position and the electrode to be identified form an electrode pair to be identified, and the electrode fault identification method includes: Detecting a starting discharge voltage of the electrode pair to be identified under a preset detection environment when the electrode to be identified in the electrode pair to be identified is in a detection state and the auxiliary electrode moves to the preset position, wherein the detection state refers to a state in which the electrode to be identified discharges in response to the starting discharge voltage; and Whether the electrode to be identified fails is determined according to the starting discharge voltage and the safety threshold range.

12. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions, which are used to enable the machine to execute the electrode fault identification method described in claim 11.

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