Fault identification system and method for plasma reactor

Abstract

The invention relates to the technical field of plasma, and discloses a fault identification system and method for a plasma reactor. The fault identification system comprises: a voltage detection device configured to detect an initial discharge voltage of the plasma reactor in a preset detection environment when the plasma reactor is in a detection state, the detection state being a state in which the plasma reactor discharges in response to the initial discharge voltage; and the control device is configured to determine whether the plasma reactor breaks down or not according to the initial discharge voltage and a safety threshold interval. The method introduces the variable of the initial discharge voltage to identify the fault of the plasma reactor, is more accurate and reliable than manual judgment, reduces the period and cost of manual maintenance, and effectively guarantees the long-term stable operation of the plasma reactor.

Description

Technical Field

[0001] The present invention relates to the field of plasma technology, and in particular to a fault identification system and method for a plasma reactor. 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 a fault identification system and method for a plasma reactor, which introduces the variable of the starting discharge voltage to identify the fault of the plasma reactor. Compared with manual judgment, it is more accurate and reliable, 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 a fault identification system comprising: a voltage detection device, configured to detect the starting discharge voltage of the plasma reactor under a preset detection environment when the plasma reactor is in a detection state, wherein the detection state refers to a state in which the plasma reactor discharges in response to the starting discharge voltage; and a control device, configured to determine whether the plasma reactor has a fault based on the starting discharge voltage and a safety threshold interval.

[0007] Preferably, the control device is configured to determine whether the plasma reactor fails, including: comparing the starting discharge voltage with the safety threshold interval; and determining that the plasma reactor has a failure or a risk of failure when the starting discharge voltage is outside the safety threshold interval.

[0008] Preferably, the control device is configured to determine that the plasma reactor 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 plasma reactor has a fault and the dielectric layer of the electrode of the plasma reactor is damaged and the internal metal is completely exposed, and / or controlling the plasma reactor to stop running; 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 plasma reactor has a risk of fault and the dielectric surface of the electrode of the plasma reactor 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 the plasma reactor has a fault and a large amount of coking exists on the dielectric surface of the electrode of the plasma reactor, wherein the first preset value is a preset ratio of the minimum value of the safety threshold interval, and / or controlling the plasma reactor to stop running; or when the starting discharge voltage is within the safety threshold interval, determining that the plasma reactor is in a normal state.

[0009] Preferably, the voltage detection device is also configured to detect the starting discharge voltage reference value of the reference plasma reactor under the preset detection environment for multiple times to obtain multiple starting discharge voltage reference values, wherein the reference plasma reactor is an unused plasma reactor, and the control device is further configured to: sort the multiple starting discharge voltage reference values; remove data ranked in the front preset ranking and the back 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.

[0010] Preferably, the fault identification system further comprises: a gas switching device configured to pass a detection gas or a working gas into the plasma reactor to switch the plasma reactor to a detection state or a working state.

[0011] Preferably, the control device is further configured to control the gas switching device to switch the working gas to the detection gas at each preset period interval, so as to control the plasma reactor to enter a detection state.

[0012] Preferably, the control device is further configured to shorten the preset period when the starting discharge voltage is greater than or equal to a first preset value and less than a minimum value of the safety threshold interval.

[0013] Preferably, the fault identification system also includes a gas detector, and the control device is further configured to perform the following operations: when the plasma reactor is in a working state, control the gas detector to detect the working gas; and when the detection result of the gas detector indicates that the benzene content of the working gas exceeds a preset concentration for a preset number of hours per day within a consecutive preset number of days, determine that the probability that the plasma reactor has a coking risk exceeds a preset value, and control the gas switching device to make the plasma reactor enter a detection state, wherein the preset number of days is less than the preset period; and when it is determined that the plasma reactor is in a normal state or has a fault risk, shorten the preset period.

[0014] Preferably, the control device is also configured to perform the following operations while or after shortening the preset period: the plasma reactor is put into working state by controlling the gas switching device; when the detection result of the gas detector indicates that the benzene content of the working gas exceeds the preset concentration for the preset hours per day for the consecutive preset number of days, it is determined that the probability that the plasma reactor has a coking risk exceeds the preset value, and the plasma reactor is put into a detection state by controlling the gas switching device; and when it is determined that the plasma reactor is in a normal state or has a risk of failure, the preset period is continued to be shortened.

[0015] Preferably, the control device is also configured to restore the preset cycle after shortening the preset cycle if the plasma reactor is in a normal state as a result of multiple consecutive tests and the BTEX content of the working gas does not exceed the preset concentration for the preset hours per day within the consecutive preset number of days.

[0016] Preferably, the fault identification system further comprises: an alarm device, configured to issue an alarm prompt when the control device determines that a fault or a risk of fault occurs in the plasma reactor.

[0017] Through the above technical scheme, the present invention creatively introduces the variable of the starting discharge voltage to identify the fault of the plasma reactor, 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.

[0018] A second aspect of the present invention provides a fault identification method for a plasma reactor, the fault identification method comprising: when the plasma reactor is in a detection state, detecting a starting discharge voltage of the plasma reactor under a preset detection environment, wherein the detection state refers to a state in which the plasma reactor discharges in response to the starting discharge voltage; and determining whether a fault occurs in the plasma reactor based on the starting discharge voltage and a safety threshold interval.

[0019] For specific details and benefits of the fault identification method for a plasma reactor provided by an embodiment of the present invention, please refer to the above description of the fault identification system for a plasma reactor, which will not be repeated here.

[0020] 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 fault identification method for a plasma reactor.

[0021] 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

[0022] 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 implementations, 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:

[0023] Figure 1 is a schematic diagram of the structure of a plasma reactor;

[0024] Figure 2 is a schematic structural diagram of a fault identification system for a plasma reactor provided by an embodiment of the present invention; and

[0025] Figure 3 It is a flow chart of a fault identification method for a plasma reactor provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] Embodiment 1

[0028] 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.

[0029] The output waveform of the working power supply includes a sine wave, a triangle wave, a square wave, a pulse wave, etc., preferably a sine wave.

[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 of which includes a first discharge electrode and a second discharge electrode. The material of the metal electrode inside the discharge electrode can be iron, copper, tungsten and other metals, preferably iron; the blocking medium on the surface can be composed of quartz, ceramics and nylon, etc., preferably quartz; the shape of the discharge electrode can be a tubular structure or a plate structure.

[0031] The purpose of the embodiment of the present invention is to detect a plasma reactor to identify whether a fault occurs in the plasma reactor.

[0032] In view of this, Figure 2 FIG. 1 is a schematic diagram of a fault identification system for a plasma reactor 4 provided by an embodiment of the present invention. Figure 2As shown, the fault identification system may include: a voltage detection device 6, configured to detect the starting discharge voltage of the plasma reactor 4 under a preset detection environment when the plasma reactor 4 is in a detection state, wherein the detection state refers to a state in which the plasma reactor 4 discharges in response to the starting discharge voltage; and a control device 7, configured to determine whether the plasma reactor 4 fails based on the starting discharge voltage and a safety threshold interval.

[0033] The voltage detection device 6 may be a voltage sensor, etc. The voltage detection device 6 is connected to the control device 7 and is connected in parallel with the working power supply 1 (not shown).

[0034] The control device 7 may be a single chip microcomputer, DSP, PLC, etc., but not limited to. The various devices in the fault identification system of the embodiment of the present invention may use the following communication methods, but not limited to: 485, 232, CIN or signal line communication. If signal line communication is used, the signal line should have the ability to shield high-frequency electromagnetic interference. The control device 7 may have the ability to feedback the system status and display the current status, which can be achieved by the upper computer display screen, indicator light, etc.

[0035] A certain discharge electrode pair of the plasma reactor 4 first starts to generate a discharge current under the action of a certain voltage, wherein the certain voltage is the starting discharge voltage of the plasma reactor 4. Specifically, when the voltage loaded on both ends of a certain discharge electrode pair of the plasma reactor 4 gradually increases to a certain critical value, the air gap between the discharge electrodes is first broken down to generate discharge, and the instantaneous voltage at the start of discharge is the starting discharge voltage between the certain discharge electrode pair (i.e., the starting discharge voltage of the plasma reactor).

[0036] Taking the plasma reactor 4 as an example, if the discharge electrode pairs of the plasma reactor 4 are in a normal state, the discharge current begins to be generated under the action of the starting discharge voltage (or detection voltage). If the discharge electrode pairs of the plasma reactor 4 fail or are at risk of failure, the starting discharge voltage of the discharge electrode pairs will change significantly compared to the starting discharge voltage of the plasma reactor before the failure. Therefore, the embodiment of the present invention uses the reference plasma reactor as a reference standard to identify the fault of the plasma reactor after use.

[0037] Specifically, taking the plasma reactor 4 as an example, the detection process of the starting discharge voltage is as follows: when the plasma reactor 4 is in the detection state, the gas introduced into the plasma reactor 4 is the detection gas (the detection gas can be air, nitrogen, various inert gases, etc.), and the working power supply is started. The working power supply gradually increases the detection voltage for the plasma reactor 4, and the voltage detection device 6 detects the change of the detection voltage applied by the working power supply 1 to the plasma reactor 4 in real time. When it is obtained that the plasma reactor 4 starts to discharge, the detection voltage applied by the working power supply 1 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.

[0038] 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 working power supply 1 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 .

[0039] In this embodiment, the fault identification system introduces a voltage detection device on the one hand, and identifies whether the plasma reactor has a fault by controlling the discharge state between the discharge electrode pairs in the plasma reactor, and on the other hand, uses the initial discharge voltage of the plasma reactor as a reference for identifying the fault. Compared with the prior art, the fault identification system of this embodiment is simple and practical in structure, does not require manual fault identification, and effectively improves the accuracy and timeliness of fault identification for the plasma reactor.

[0040] Embodiment 2

[0041] On the basis of the first embodiment, the fault identification system further includes: a gas switching device 5 configured to pass a detection gas or a working gas into the plasma reactor to switch the plasma reactor to a detection state or a working state.

[0042] For example, Figure 2As shown, the gas switching device 5 may include a working switch K1 and a working switch K2. In addition, the gas switching device 5 may be controlled by the control device 7 or manually to perform corresponding actions, and the current switching state will also be returned to the control device 7. For example, when the control device 7 controls the working switch K1 to be turned on and K2 to be turned off, the working gas (such as organic waste gas) introduced into the plasma reactor 4, at this time, the plasma reactor 4 is controlled to switch to the working state. If the plasma reactor 4 is to be subjected to fault identification and detection, the working switch K1 is controlled to be turned off and K2 is controlled to be turned on, and the detection gas introduced into the plasma reactor 4, at this time, the plasma reactor 4 is controlled to switch to the detection state.

[0043] In addition, the above-mentioned working switches include but are not limited to intermediate relays, circuit breakers, contactors, IGBTs, GTOs, MOSFETs and other devices with switching functions.

[0044] It should be noted that the above-mentioned configuration of the gas switching device is only a preferred configuration, and the gas 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 gas switching devices according to actual needs to achieve switching between the working state and the detection state.

[0045] In this embodiment, by providing a gas switching device, the working state and the detection state of the plasma reactor can be switched flexibly in real time, so as to effectively and conveniently realize fault detection of the plasma reactor.

[0046] In a preferred embodiment, the fault identification system further comprises an alarm device (not shown) for issuing an alarm prompt when the control device 7 determines that a fault or a risk of a fault occurs in the plasma reactor.

[0047] For example, taking a sound alarm as an example, when the control device 7 determines that the plasma reactor 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 plasma reactor has a fault or a risk of a fault, an alarm message is displayed to prompt the on-site staff to repair the fault in a timely manner.

[0048] In the embodiment of the present invention, an alarm device is provided to promptly notify the staff to carry out maintenance work when a fault occurs in the plasma reactor, thereby ensuring the operational safety of the plasma reactor.

[0049] Embodiment 3

[0050] With respect to the fault identification system of the first or second embodiment above, the structure and function thereof are further described in detail below.

[0051] As mentioned in the first embodiment, the present invention identifies the fault of the plasma reactor by taking the initial discharge voltage of the reference plasma reactor as a reference quantity. The following is a detailed description of the process of the control device identifying the fault based on the initial discharge voltage by using an example.

[0052] The control device is configured to determine whether the plasma reactor fails, including: comparing the starting discharge voltage with the safety threshold interval; and determining that the plasma reactor fails or is at risk of failure when the starting discharge voltage is outside the safety threshold interval.

[0053] Wherein, the voltage detection device is also configured to detect the starting discharge voltage reference value of the reference plasma reactor under the preset detection environment for multiple times to obtain multiple starting discharge voltage reference values, wherein the reference plasma reactor is the plasma reactor that has not been used, 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.

[0054] For example, before the plasma reactor is purified (i.e., before the plasma reactor is used, the plasma reactor is a reference plasma reactor), it is necessary to obtain the initial discharge voltage of the plasma reactor under normal conditions as a plasma reactor state determination parameter: i.e., the initial discharge voltage determination parameter U SH and U SL , U SH and U SL The specific process is as follows: the detection gas is introduced into the reference plasma reactor, the working power supply is controlled to increase the voltage, and the starting discharge voltage at the time when the discharge starts between the discharge electrode pair in the plasma reactor is obtained, and then the working power supply is controlled to reduce the voltage to 0, and the voltage is increased again to obtain another starting discharge voltage data in a similar manner, and this step is repeated to obtain n starting discharge voltage data, and the first 1 / 10 and the last 1 / 10 of the data are removed after sorting by voltage (rounded down), and the maximum value is assigned as U SH , the minimum value is U SL, thereby obtaining the plasma reactor state determination parameter (i.e., safety threshold interval). The determination of the plasma reactor state determination parameter (i.e., 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 discharge electrode pair of the plasma reactor), and the process of detecting the starting discharge voltage in each embodiment of the present invention is also performed under the same preset detection environment. If the environmental parameters change, it is necessary to re-acquire the plasma reactor state determination parameter (i.e., safety threshold interval).

[0055] Specifically, the control device is configured to determine that the plasma reactor 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 plasma reactor has a fault and the dielectric layer of the electrode of the plasma reactor is damaged and the internal metal is completely exposed, and / or controlling the plasma reactor to stop running; 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 plasma reactor has a risk of fault and the dielectric surface of the electrode of the plasma reactor 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 the plasma reactor has a fault and a large amount of coking exists on the dielectric surface of the electrode of the plasma reactor, wherein the first preset value is a preset ratio of the minimum value of the safety threshold interval, and / or controlling the plasma reactor to stop running; or when the starting discharge voltage is within the safety threshold interval, determining that the plasma reactor is in a normal state.

[0056] Below Figure 2 The fault identification system shown in FIG. 1 is used as an example to explain the fault identification process of the plasma reactor 4 by the fault identification system in detail. Figure 3 shown.

[0057] The control device 7 controls the working switch K1 to open and K2 to close, so as to allow the working gas to enter the plasma reactor 4. 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.

[0058] Step S1: The plasma reactor enters a detection state.

[0059] When the plasma reactor enters the detection state, the environment parameters and the detection gap length g are respectively set to be the same as the environment parameters and gap length for obtaining the electrode state determination parameters. When switching from the working state to the detection state, the working switch K1 is disconnected and K2 is closed to allow the working gas to flow into the plasma reactor. In the entire detection state, the working switch K2 is in the disconnected state, the working switch K1 is in the closed state, and the size of the detection gap remains unchanged.

[0060] Step S2: Obtain the starting discharge voltage measurement value Us.

[0061] 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 .

[0062] Step S3: Determine U S >U SH Is it true? If so, execute step S4; otherwise, execute step S5.

[0063] Step S4: There is a fault in the plasma reactor.

[0064] Step S5: Determine U S SH Is it established? If so, execute step S6; otherwise, execute step S8.

[0065] Step S6: Determine U S <0.8U SL Is it established? If so, execute step S4; otherwise, execute step S7.

[0066] Step S7: There is a risk of failure of the plasma reactor.

[0067] Step S8: The plasma reactor is normal.

[0068] Through the above steps S3-S8, the starting discharge voltage measurement value U S and the decision parameter U SH and U SL Compare to determine the status of this plasma reactor:

[0069] When U S >U SH ​When the plasma reactor is faulty, the dielectric layer of the discharge electrode pair is damaged, and the metal inside the electrode is completely exposed. The plasma reactor is marked as a faulty plasma reactor; and the plasma reactor is stopped by the control device 7, and a fault signal is fed back.

[0070] When 0.8U SL ≤U S SL When the plasma reactor is judged to have a risk of failure, coking, liquid water, cracks or damage may exist on the medium surface of the discharge electrode pair, and the plasma reactor is marked as a high-risk plasma reactor; and the detection frequency is increased by the control device 7 (that is, the time to the next detection is shortened), and a high-risk signal is fed back.

[0071] When U S <0.8U SL When the system determines that there is a fault in the plasma reactor, there is a large amount of coking on the medium surface of the discharge electrode pair, etc., and marks the plasma reactor as a faulty plasma reactor; and controls the plasma reactor to stop running through the control device 7, and feeds back a fault signal.

[0072] When U SL ≤U S ≤U SH , the system considers the plasma reactor to be normal.

[0073] Finally, the status information of the plasma reactor is output by the control device to the upper computer display screen or indicator light. After the plasma reactor is free of faults, the detection state can be restored to the working state manually or by the control device. When switching from the detection state to the working state, the working switch K1 is turned on and the working switch K2 is turned off.

[0074] Embodiment 4

[0075] On the basis of the above embodiment, a preset period can also be set by the control device, and the control device controls the gas switching device to switch the plasma reactor to the detection state at intervals of the preset period to achieve regular fault detection. In this way, the plasma reactor state can be better monitored to avoid further expansion of the fault.

[0076] The control device is further configured to control the gas switching device to switch the working gas to the detection gas at each preset period interval, so as to control the plasma reactor to enter a detection state.

[0077] ​That is, when the system starts, an automatic detection cycle T (i.e., a preset cycle) is set in the control device 7, thereby controlling the gas switching device 5 to pass the detection gas into the plasma reactor every time T to perform an automatic detection on the plasma reactor.

[0078] The control device is further configured to shorten the preset period when the starting discharge voltage is greater than or equal to a first preset value and less than a minimum value of the safety threshold interval.

[0079] In addition to the above-mentioned regular inspections, the plasma reactor faults can also be promptly inspected according to the working status of the plasma reactor. For example, if the benzene content of the organic waste gas to be treated exceeds 200 ppm for 8 hours per day for 3 consecutive days, the plasma reactor has a high risk of coking and immediately enters the inspection state.

[0080] The fault identification system further includes a gas detector 8. Accordingly, the control device 7 is further configured to perform the following operations: when the plasma reactor is in a working state, control the gas detector to detect the working gas; and when the detection result of the gas detector indicates that the benzene content of the working gas exceeds the preset concentration for a cumulative preset number of hours per day within a continuous preset number of days, determine that the probability of the plasma reactor having a coking risk exceeds a preset value, and control the gas switching device to make the plasma reactor enter a detection state, wherein the preset number of days is less than the preset period; and when it is determined that the plasma reactor is in a normal state or has a risk of failure, shorten the preset period.

[0081] The preset period may be T (e.g., 10 days), and the preset number of days may be 3 days. Of course, the preset number of days and the preset period may be reasonably set according to actual conditions.

[0082] The gas detector 8 may be a gas sensor for detecting in real time the type and concentration of the organic waste gas to be input into the plasma reactor.

[0083] Specifically, if the plasma reactor 4 is in working state, the control device 7 controls the gas detector 8 to detect the working gas in real time; if the detection result shows that the to-be-treated organic waste gas has a benzene content of more than 200ppm for 8 hours per day for 3 consecutive days, it means that the plasma reactor 4 has a high risk of coking, and the plasma reactor 4 is immediately put into the detection state by controlling the gas switching device 5. The operation status of the plasma reactor 4 is identified through the above fault identification process. If the identification result shows that the plasma reactor is in a normal state (or there is a risk of failure but it has returned to a normal state), the preset period is shortened to 0.3-0.9T (for example, 6 days).

[0084] Furthermore, the control device is also configured to perform the following operations while or after shortening the preset period: the plasma reactor is put into a working state by controlling the gas switching device; when the detection result of the gas detector indicates that the benzene content of the working gas exceeds the preset concentration for the preset hours per day for the consecutive preset number of days, determine that the probability that the plasma reactor has a coking risk exceeds the preset value, and put the plasma reactor into a detection state by controlling the gas switching device; and when it is determined that the plasma reactor is in a normal state or has a risk of failure, continue to shorten the preset period.

[0085] Alternatively, the control device is further configured to perform the following operations after shortening the preset period: when multiple consecutive detection results indicate that the plasma reactor is in a normal state and the BTEX content of the working gas accumulated for the preset hours per day for the consecutive preset number of days does not exceed the preset concentration, restore the preset period.

[0086] Specifically, at the same time or after the preset period (T) is shortened to 2 days, the gas switching device 5 is controlled by the control device 7 to switch the plasma reactor 4 from the detection state to the working state. The control device 7 controls the gas detector 8 to detect the working gas in real time; and, according to the detection result, the following two operations are performed.

[0087] If the test results show that the benzene content of the organic waste gas to be treated exceeds 200ppm for 8 hours per day for 3 consecutive days, it means that the risk of coking of the plasma reactor 4 is still high, and the plasma reactor 4 is immediately put into the detection state by controlling the gas switching device 5. The operation status of the plasma reactor 4 is identified through the above fault identification process. If the identification result shows that the plasma reactor is in a normal state (or there is a risk of failure but it has returned to a normal state), the preset period is further shortened to 0.1-0.3T (for example, 2 days).

[0088] After shortening the preset period (including shortening or continuing to shorten the preset period), if three consecutive detection results indicate that the plasma reactor is in a normal state and the BTEX content of the working gas accumulated for the preset hours per day for three consecutive days drops below the preset concentration of 200 ppm, the preset period T is restored.

[0089] In addition, the fault identification methods in the above 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.

[0090] Each embodiment of the present invention provides a detection system for a plasma reactor 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 can conveniently perform detection without the time-consuming and laborious disassembly and assembly of the reactor, thereby reducing the cycle and cost of manual maintenance. The method improves the accuracy of fault identification by comparing the changes in the starting discharge voltage of the plasma reactor and the reference plasma reactor during the discharge process. According to the range of the difference, the fault type and degree of the plasma reactor can be accurately determined, avoiding the unreliability of manual judgment and ensuring the long-term stable operation of the device.

[0091] The 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 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 reactor 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.

[0092] In summary, the present invention creatively introduces the variable of starting discharge voltage to identify faults of plasma reactors, 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.

[0093] Embodiment 5

[0094] An embodiment of the present invention provides a fault identification method for a plasma reactor, the fault identification method comprising: when the plasma reactor is in a detection state, detecting a starting discharge voltage of the plasma reactor under a preset detection environment, wherein the detection state refers to a state in which the plasma reactor discharges in response to the starting discharge voltage; and determining whether a fault occurs in the plasma reactor based on the starting discharge voltage and a safety threshold interval.

[0095] For specific details and benefits of the fault identification method for a plasma reactor provided by an embodiment of the present invention, please refer to the above description of the fault identification system for a plasma reactor, which will not be repeated here.

[0096] Embodiment 6

[0097] This embodiment provides a fault identification system for a plasma reactor, which is composed of a plasma reactor 4, a gas detector 8, a gas switching device 5, a voltage detection device 6 and a control device 7. Figure 2 Wherein, the plasma reactor includes a plurality of tube-type electrodes and a working power supply, such as Figure 1 shown.

[0098] The discharge electrode adopts a tube-row structure, and the discharge gap of the electrode tube is 4mm. The size of the discharge disk is 50cm*30cm, including 21 electrodes in a row. The high-voltage electrode and the ground electrode are 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. The plasma working power supply adopts a sinusoidal AC power supply with an output power of 0-3kW and an output voltage of 0-30kV. The detection gas is air, and the gas volume is 300m 3 / h. Before the device leaves the factory, the initial discharge voltage of the plasma reactor under normal conditions is obtained as the plasma reactor state judgment parameter, that is, the judgment parameter U of the initial discharge voltage SH and U SL The specific process is as follows: when the system is in the detection state, the detection gas is introduced into the plasma reactor, the working power supply is controlled to increase the voltage, and the starting discharge voltage is obtained; then, the working power supply is controlled to reduce the voltage to 0, and the voltage is increased again to obtain another starting discharge voltage data, and this step is repeated to obtain n starting discharge voltage data, and the first 1 / 10 and the last 1 / 10 of the data are removed (rounded down) after sorting by voltage, and the maximum value is assigned as U SH , the minimum value is U SL , thus obtaining the plasma reactor state judgment parameter U SH =26.8kV, U SL =25.2kV.

[0099] When the system is in working state, the gas input into the plasma reactor is organic waste gas, and the working power source drives the plasma reactor to generate plasma to purify the organic waste gas.

[0100] When the system enters the detection state, the gas switching device switches the input gas of the plasma reactor from organic waste gas to detection gas, ensuring that the type and gas speed of the currently introduced detection gas are the same as the detection gas introduced when obtaining the starting discharge voltage judgment parameters.

[0101] At the beginning of the test, the working power supply is controlled to increase the voltage to obtain the starting discharge voltage; then, the working power supply 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 n starting discharge voltage data, and the first 1 / 10 and the last 1 / 10 data are removed (rounded down) after sorting by voltage, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0102] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL Compare to determine the status of the plasma reactor.

[0103] When U S >U SH When the system detects that there is a fault in the plasma reactor, the dielectric layer of the plasma electrode is damaged, the metal inside the electrode is completely exposed, etc., the system controls the plasma reactor to stop running and feeds back a fault signal.

[0104] When 0.8U SL ≤U S SL When the system determines that there is a risk of failure in the plasma reactor, there may be coking, liquid water attached, cracks or damage on the surface of the plasma electrode medium, etc., the detection frequency is increased (i.e., the time to the next detection is shortened) and a high-risk signal is fed back.

[0105] When U S <0.8U SL When the system determines that there is a fault in the plasma reactor and there may be a large amount of coking on the surface of the plasma electrode medium, the system controls the plasma reactor to stop running and feeds back a fault signal.

[0106] When U SL ≤U S ≤U SH , the system considers the plasma reactor electrodes to be normal.

[0107] Finally, the plasma reactor status information is output by the control device to the upper computer display screen or indicator light, etc.

[0108] After the detection is completed, if there is no fault in the system, the control device will control the detection state to return to the working state. At this time, the working power will be started and the gas input into the reactor will be switched to organic waste gas for normal operation.

[0109] In this embodiment, the following automatic detection method is also proposed.

[0110] ​When the system is started, an automatic detection cycle T is set (ie, an automatic detection is performed every time T). During operation, the gas detector detects the type and concentration of the organic waste gas input into the plasma reactor in real time.

[0111] When the gas detector detects that the benzene content in the organic waste gas to be treated exceeds 200ppm for a total of 8 hours a day for 3 consecutive days, the plasma reactor has a high risk of coking and immediately enters the detection state. After the detection, if it is in a faulty state, the reactor will be cut out of the system and wait for manual maintenance; if the plasma reactor is in a normal state or a high-risk state, the automatic detection cycle will be shortened to 0.3-0.9T (≥3 days); after the cycle is shortened, if the benzene content is still too high for a long time (the benzene content exceeds 200ppm for a total of 8 hours a day for 3 consecutive days), the automatic detection cycle will be further shortened to 0.1-0.3T (≥1 day). If the test results are normal for three consecutive times and the benzene content in the waste gas to be treated drops to the set critical value, the automatic detection cycle will be restored to T.

[0112] Embodiment 7 (Example involving complete exposure of metal inside the electrode)

[0113] According to the fault identification system in the sixth embodiment, this embodiment provides a fault identification method for a plasma reactor, which is described in detail as follows.

[0114] In the embodiment of the present invention, the exhaust gas contains propylene with a concentration of 200-350 ppm and a gas volume of 800 m 3 / h. In the process of propylene degradation, the coking on the electrode tube surface is not obvious.

[0115] At the beginning of the test, the test gas is introduced into the plasma reactor, and the working power supply is controlled to increase the voltage to obtain the starting discharge voltage; then, the working power supply 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, and the first and last data are removed after sorting by voltage size, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0116] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL By comparing the plasma reactor status, U S =28.0kV>U SH =26.8kV, the system determines that there is a fault in the plasma reactor, the dielectric layer of the plasma electrode is damaged, the metal inside the electrode is completely exposed, etc., and controls the plasma reactor to stop running, and feeds back the fault signal to the upper computer display.

[0117] After replacing the faulty electrode, retest was performed. After the test, the plasma reactor electrode was normal, and the plasma reactor U SL S =25.8kV SH The control device controls the detection state to be restored to the working state, starts the working power supply and switches the gas input into the reactor to organic waste gas, and operates normally.

[0118] Embodiment 8 (Example involving liquid water attached to the electrode surface)

[0119] According to the fault identification system in the sixth embodiment, this embodiment provides a fault identification method for a plasma reactor, which is described in detail as follows.

[0120] In the embodiment of the present invention, the exhaust gas contains formaldehyde with a concentration of 400-550 ppm and a gas volume of 280 m 3 / h. During the degradation process, coking on the electrode tube surface is not obvious.

[0121] At the beginning of the test, the test gas is introduced into the plasma reactor, and the working power supply is controlled to increase the voltage to obtain the starting discharge voltage; then, the working power supply 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, and the first and last data are removed after sorting by voltage size, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0122] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL By comparison, the plasma reactor status was determined and 0.8U SL =20.16kV S =23.2kV SL =25.2kV, the system determines that there is a risk of failure in the plasma reactor, and there may be coking, liquid water attached, cracks or damage on the surface of the plasma electrode medium. The automatic detection cycle is reduced from 20 days to 10 days, and a high-risk signal is fed back.

[0123] After the detection is completed, the control device controls the detection state to be restored to the working state, starts the working power supply and switches the gas input into the reactor to organic waste gas for normal operation.

[0124] ​​​​After 10 days of continuous operation, the system enters the detection state again. At the beginning of the detection, the detection gas is introduced into the plasma reactor, the working power supply is controlled to increase the voltage, and the starting discharge voltage is obtained; then, the working power supply 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, and the first and last data are removed after sorting by voltage size, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0125] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL By comparing the plasma reactor status, the plasma reactor U SL S =26.0kV SH The plasma reactor electrode is normal. The control device controls the detection state to return to the working state, starts the working power supply and switches the gas input into the reactor to organic waste gas, and works normally.

[0126] Embodiment 9 (Example involving electrode coking)

[0127] According to the fault identification system in the sixth embodiment, this embodiment provides a fault identification method for a plasma reactor, which is described in detail as follows.

[0128] In the embodiment of the present invention, the exhaust gas contains xylene, with a concentration of 300-450 ppm and a gas volume of 250 m 3 / h. The gas detector detected that the benzene content of the organic waste gas to be treated exceeded 200ppm for a total of 8 hours per day for 3 consecutive days. The risk of coking in the plasma reactor was high, and the detection state was immediately entered.

[0129] At the beginning of the test, the test gas is introduced into the plasma reactor, and the working power supply is controlled to increase the voltage to obtain the starting discharge voltage; then, the working power supply 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, and the first and last data are removed after sorting by voltage size, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0130] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL By comparison, the plasma reactor status was determined and 0.8U S =20.16kV L S ​​​=23.2kV SL =25.2kV, the system determines that there is a risk of failure in the plasma reactor, and there may be coking, liquid water attached, cracks or damage on the surface of the plasma electrode medium. The automatic detection cycle is reduced from 20 days to 10 days, and a high-risk signal is fed back.

[0131] After the detection is completed, the control device controls the detection state to be restored to the working state, starts the working power supply and switches the gas input into the reactor to organic waste gas for normal operation.

[0132] During the shutdown and maintenance, the staff found that there was coke attached to the surface of the plasma reactor electrode. After cleaning, they retested it. After the test, the plasma reactor electrode was normal. The plasma reactor U SL S =26.2kV SH The control device controls the detection state to be restored to the working state, starts the working power supply and switches the gas input into the reactor to organic waste gas, and operates normally.

[0133] Example 10 (involving an example in which the electrode surface has cracks)

[0134] According to the fault identification system in the sixth embodiment, this embodiment provides a fault identification method for a plasma reactor, which is described in detail as follows.

[0135] In the embodiment of the present invention, the exhaust gas contains formaldehyde with a concentration of 400-550 ppm and a gas volume of 280 m 3 / h. During the degradation process, coking on the electrode tube surface is not obvious.

[0136] At the beginning of the test, the test gas is introduced into the plasma reactor, and the working power supply is controlled to increase the voltage to obtain the starting discharge voltage; then, the working power supply 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, and the first and last data are removed after sorting by voltage size, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0137] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL By comparison, the plasma reactor status was determined and 0.8U SL =20.16kV S =23.2kV SL ​​​​​=25.2kV, the system determines that there is a risk of failure in the plasma reactor, and there may be coking, liquid water attached, cracks or damage on the surface of the plasma electrode medium. The automatic detection cycle is reduced from 20 days to 10 days, and a high-risk signal is fed back.

[0138] After the detection is completed, the control device controls the detection state to be restored to the working state, starts the working power supply and switches the gas input into the reactor to organic waste gas for normal operation.

[0139] After 10 days of continuous operation, the system enters the detection state again. At the beginning of the detection, the detection gas is introduced into the plasma reactor, the working power supply is controlled to increase the voltage, and the starting discharge voltage is obtained; then, the working power supply 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, and the first and last data are removed after sorting by voltage size, 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 By comparison, the plasma reactor status was determined and 0.8U SL =20.16kV S =22.2kV SL =25.2kV, the system determines that there is a risk of failure in the plasma reactor, and there may be coking, liquid water attached, cracks or damage on the surface of the plasma electrode medium. The automatic detection cycle is reduced from 10 days to 5 days, and a high-risk signal is fed back.

[0141] After the detection is completed, the control device controls the detection state to be restored to the working state, starts the working power supply and switches the gas input into the reactor to organic waste gas for normal operation.

[0142] The system was in alarm state for a long time. After inspection, the staff found that the 2nd, 3rd and 4th electrodes of the plasma reactor had cracks and damage. The faulty electrodes were replaced and retested. After the test, the plasma reactor electrodes were normal. The plasma reactor U SL S =26.5kV SH The control device controls the detection state to be restored to the working state, starts the working power supply and switches the gas input into the reactor to organic waste gas, and operates normally.

[0143] Example 11 (Example of automatic detection of large amount of coking on electrodes)

[0144] ​​​​According to the fault identification system in the sixth embodiment, this embodiment provides a fault identification method for a plasma reactor, which is described in detail as follows.

[0145] In the embodiment of the present invention, the component of the waste gas is toluene, the concentration is 420-720ppm, and the average gas volume is 440m 3 / h. The gas detector detected that the benzene content of the organic waste gas to be treated exceeded 200ppm for a total of 8 hours per day for 3 consecutive days. The risk of coking in the plasma reactor was high, and the detection state was immediately entered.

[0146] At the beginning of the test, the test gas is introduced into the plasma reactor, and the working power supply is controlled to increase the voltage to obtain the starting discharge voltage; then, the working power supply 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, and the first and last data are removed after sorting by voltage size, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0147] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL By comparing the plasma reactor status, the plasma reactor U SL S =25.3kV SH , the plasma reactor electrode is normal, the control device controls the detection state to return to the working state, starts the working power supply and switches the gas input to the reactor to organic waste gas, and works normally. Since the risk of coking in the plasma reactor is high at this time, the automatic detection cycle is shortened from 20 days to 10 days.

[0148] After continuing to operate for 3 days, the gas detector detected that the benzene content in the organic waste gas to be treated exceeded 200 ppm for a total of 8 hours a day for 3 consecutive days. The plasma reactor had a high risk of coking and immediately entered the detection state.

[0149] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL By comparison, the plasma reactor status was determined and 0.8U SL =20.16kV S =21.7kV SL =25.2kV, the system determines that there is a risk of failure in the plasma reactor, and there may be coking, liquid water attached, cracks or damage on the surface of the plasma electrode medium. The automatic detection cycle is reduced from 10 days to 5 days, and a high-risk signal is fed back. ​​​​

[0150] After the detection is completed, the control device controls the detection state to be restored to the working state, starts the working power supply and switches the gas input into the reactor to organic waste gas for normal operation.

[0151] After continuing to operate for 3 days, the gas detector detected that the benzene content in the organic waste gas to be treated exceeded 200 ppm for a total of 8 hours a day for 3 consecutive days. The plasma reactor had a high risk of coking, so it immediately entered the detection state and the automatic detection cycle was shortened to 2 days.

[0152] At the beginning of the test, the test gas is introduced into the plasma reactor, and the working power supply is controlled to increase the voltage to obtain the starting discharge voltage; then, the working power supply 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, and the first and last data are removed after sorting by voltage size, and the remaining data are averaged to obtain the starting discharge voltage measurement value U S .

[0153] The starting discharge voltage measurement value U S and the decision parameter U SH and U SL By comparing the plasma reactor status, U S =19.7kV<0.8U SL =20.16kV, the system determines that there is a fault in the plasma reactor and there may be a large amount of coking on the surface of the plasma electrode medium. The system controls the plasma reactor to stop running and feeds back a fault signal.

[0154] After inspection, the staff found that there was charred material attached to the surface of the plasma reactor electrode. After cleaning, the test was repeated. After the test, the plasma reactor electrode was normal. The plasma reactor U SL S =26.6kV SH The control device controls the detection state to be restored to the working state, starts the working power supply and switches the gas input into the reactor to organic waste gas, and operates normally.

[0155] The above-mentioned embodiments can conveniently and effectively detect the status of a plasma reactor, and can be applied to existing plasma reactors without the need for additional components and time-consuming and laborious disassembly and assembly of the reactor, thereby reducing the cycle and cost of manual maintenance.

[0156] Embodiment 12

[0157] 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 fault identification method for a plasma reactor. ​​

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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. A fault identification system for a plasma reactor, characterized in that: The fault identification system comprises: a voltage detection device configured to detect a starting discharge voltage of the plasma reactor under a preset detection environment when the plasma reactor is in a detection state, wherein the detection state refers to a state in which the plasma reactor discharges in response to the starting discharge voltage; and The control device is configured to determine whether the plasma reactor fails according to the starting discharge voltage and a safety threshold interval.

2. The fault identification system according to claim 1, characterized in that: The control device is configured to determine whether the plasma reactor fails, including: Comparing the starting discharge voltage with the safety threshold interval; and When the starting discharge voltage is outside the safety threshold range, it is determined that the plasma reactor is faulty or at risk of faulty.

3. The fault identification system according to claim 2, characterized in that: The control device is configured to determine that the plasma reactor has a fault or a risk of a fault, including: When the starting discharge voltage is greater than the maximum value of the safety threshold interval, it is determined that the plasma reactor is faulty and the dielectric layer of the electrode of the plasma reactor is damaged and the internal metal is completely exposed, and / or the plasma reactor is controlled to stop operating; When the starting discharge voltage is greater than or equal to a first preset value and less than a minimum value of the safety threshold interval, it is determined that the plasma reactor has a risk of failure and the medium surface of the electrode of the plasma reactor 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 the plasma reactor is faulty and a large amount of coking exists on the medium surface of the electrode of the plasma reactor, wherein the first preset value is a preset ratio of the minimum value of the safety threshold interval, and / or controlling the plasma reactor to stop operating; or When the starting discharge voltage is within the safety threshold range, it is determined that the plasma reactor is in a normal state.

4. The fault identification system according to claim 2, characterized in that: The voltage detection device is further configured to detect the starting discharge voltage reference value of the reference plasma reactor under the preset detection environment for multiple times to obtain multiple starting discharge voltage reference values, wherein the reference plasma reactor is the plasma reactor that has not been used, and The control device is also configured to: sorting the plurality of starting discharge voltage reference values; Remove the data of the top preset ranking and the bottom preset ranking from the plurality of starting discharge voltage reference values ​​to obtain the remaining data; as well as 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.

5. The fault identification system according to claim 1, characterized in that: The fault identification system further comprises: The gas switching device is configured to pass the detection gas or the working gas into the plasma reactor to switch the plasma reactor to a detection state or a working state.

6. The fault identification system according to claim 5, characterized in that: The control device is further configured to control the gas switching device to switch the working gas to the detection gas at each preset period interval, so as to control the plasma reactor to enter a detection state.

7. The fault identification system according to claim 6, characterized in that: The control device is further configured to shorten the preset period when the starting discharge voltage is greater than or equal to a first preset value and less than a minimum value of the safety threshold interval.

8. The fault identification system according to claim 6, characterized in that: The fault identification system further comprises a gas detector, The control device is also configured to perform the following operations: When the plasma reactor is in working state, controlling the gas detector to detect the working gas; and When the detection result of the gas detector shows that the benzene content of the working gas exceeds the preset concentration for the preset hours every day within the consecutive preset number of days, it is determined that the probability that the plasma reactor has a coking risk exceeds the preset value, and the plasma reactor enters the detection state by controlling the gas switching device, wherein the preset number of days is less than the preset period; as well as When it is determined that the plasma reactor is in a normal state or has a risk of failure, the preset period is shortened.

9. The fault identification system according to claim 8, characterized in that: The control device is further configured to perform the following operations simultaneously with or after shortening the preset period: The plasma reactor is put into working state by controlling the gas switching device; When the detection result of the gas detector shows that the accumulated benzene content of the working gas exceeds the preset concentration for the preset hours every day for the consecutive preset number of days, it is determined that the probability that the plasma reactor has a coking risk exceeds the preset value, and the plasma reactor enters a detection state by controlling the gas switching device; as well as When it is determined that the plasma reactor is in a normal state or has a risk of failure, the preset period continues to be shortened.

10. The fault identification system according to claim 8 or 9, characterized in that: The control device is also configured to restore the preset period after shortening the preset period if the plasma reactor is in a normal state as a result of multiple consecutive tests and the BTEX content of the working gas does not exceed the preset concentration for the preset hours per day within the consecutive preset number of days.

11. The fault identification system according to claim 1, characterized in that: The fault identification system further comprises: An alarm device is used to issue an alarm prompt when the control device determines that the plasma reactor has a fault or a risk of a fault.

12. A fault identification method for a plasma reactor, characterized in that: The fault identification method comprises: When the plasma reactor is in a detection state, detecting a starting discharge voltage of the plasma reactor under a preset detection environment, wherein the detection state refers to a state in which the plasma reactor discharges in response to the starting discharge voltage; and Whether a fault occurs in the plasma reactor is determined according to the starting discharge voltage and a safety threshold interval.

13. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions for causing a machine to execute the fault identification method for a plasma reactor as claimed in claim 12.

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