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CN-121992422-A - Device and method for monitoring electric leakage and discharge of electrolytic tank

CN121992422ACN 121992422 ACN121992422 ACN 121992422ACN-121992422-A

Abstract

The invention relates to a device and a monitoring method for monitoring electric leakage and discharge of an electrolytic cell, wherein the device comprises a power grid power supply unit, a contactor, a hydrogen production power supply, a proton exchange membrane electrolytic cell body, at least one pickup, a controller, an alarm unit, a valve control unit and a signal conditioner, wherein the power grid power supply unit is connected with the hydrogen production power supply through the contactor, the proton exchange membrane electrolytic cell body is respectively connected with the hydrogen production power supply and the valve control unit, the pickup is arranged around the proton exchange membrane electrolytic cell body and is used for collecting sound signals in the running process of the proton exchange membrane electrolytic cell body, the pickup is connected with the signal conditioner, and the controller is respectively connected with the signal conditioner, the alarm unit, the valve control unit and the contactor, so that the timely monitoring and low leakage detection rate can be realized, and the running safety can be improved.

Inventors

  • ZHOU DONGDONG

Assignees

  • 江苏中车氢芯动力科技有限公司

Dates

Publication Date
20260508
Application Date
20260320

Claims (10)

  1. 1. The device for monitoring the electric leakage and discharge of the electrolytic cell is characterized by comprising a power grid power supply unit, a contactor, a hydrogen production power supply, a proton exchange membrane electrolytic cell body, at least one pickup, a controller, an alarm unit, a valve control unit and a signal conditioner, wherein the power grid power supply unit is connected with the hydrogen production power supply through the contactor, the proton exchange membrane electrolytic cell body is respectively connected with the hydrogen production power supply and the valve control unit, the pickup is arranged around the proton exchange membrane electrolytic cell body and is used for collecting sound signals in the running process of the proton exchange membrane electrolytic cell body, the pickup is connected with the signal conditioner, and the controller is respectively connected with the signal conditioner, the alarm unit, the valve control unit and the contactor.
  2. 2. The apparatus for monitoring the leakage discharge of an electrolytic cell according to claim 1, wherein the controller is a PLC controller.
  3. 3. The device for monitoring the electric leakage and discharge of the electrolytic tank according to claim 2, wherein the PLC is internally provided with a sound characteristic analysis algorithm.
  4. 4. A device for monitoring the leakage discharge of an electrolytic cell according to claim 1, wherein the grid power supply unit provides 380V alternating current.
  5. 5. An apparatus for monitoring an electric leakage discharge of an electrolytic cell according to claim 1 wherein the valve control unit comprises a hydrogen outlet solenoid valve, an oxygen outlet solenoid valve and a water supply line electric valve.
  6. 6. A device for monitoring the leakage discharge of an electrolytic cell according to claim 1, wherein the number of the sound pickup is two, one sound pickup is arranged at the upper side surface position of the body of the proton exchange membrane electrolytic cell, and the other sound pickup is arranged at the lower side surface position of the body of the proton exchange membrane electrolytic cell.
  7. 7. The apparatus for monitoring the leakage discharge of an electrolytic cell according to claim 1, wherein the pickup is an explosion-proof pickup.
  8. 8. The apparatus for monitoring the leakage discharge of an electrolytic cell according to claim 1, wherein the signal conditioner comprises an amplifier and a filter.
  9. 9. A monitoring method for monitoring the leakage discharge of an electrolytic cell by using the device of any one of claims 1 to 8, comprising the steps of: A. collecting sound signals, namely collecting the sound signals in the running process of the proton exchange membrane electrolytic cell body through sound pickups arranged around the proton exchange membrane electrolytic cell body, and converting the sound signals into analog electric signals; B. The signal is conditioned, then the pickup transmits the analog electric signal to the signal conditioner, Amplifying weak sound signals through an amplifier of a signal conditioner, reserving a high-frequency band of 1 kHz-15 kHz through a filter of the signal conditioner, and filtering low-frequency pump sound interference; C. The analog quantity input of the controller is realized by connecting the analog electric signal conditioned by the signal conditioner with an analog quantity input unit of the controller; D. The controller extracts parameters, namely a sound pressure level RMS value, a high-frequency band energy duty ratio and a rising edge slope of sound pulses; E. Judging whether leakage discharge exists, when any one of the three parameters of the sound pressure level RMS value, the high-frequency band energy duty ratio and the rising edge slope of the sound pulse exceeds a preset threshold value and continuously exceeds a set time, the controller can judge that an early leakage discharge fault occurs, immediately synchronously triggering the alarm unit and an emergency stop instruction, disconnecting the contactor to cut off power supply, driving the valve control unit to be rapidly closed to block material circulation, and continuously monitoring if all the three parameters do not exceed the preset threshold value.
  10. 10. A monitoring method for monitoring an electric leakage discharge of an electrolytic cell according to claim 9, wherein in step E, the preset threshold of the sound pressure level RMS value is 85dB, the preset threshold of the high-frequency band energy ratio is 30%, and the preset threshold of the rising edge slope is 50dB/ms.

Description

Device and method for monitoring electric leakage and discharge of electrolytic tank Technical Field The invention relates to the technical field of electrolytic tanks, in particular to a device and a method for monitoring electric leakage and discharge of an electrolytic tank. Background In the water electrolysis hydrogen production process, a Proton Exchange Membrane (PEM) electrolytic cell has become one of the mainstream technologies for preparing green hydrogen because of the advantages of high current density, high response speed, high hydrogen purity and the like. However, PEM electrolyzers experience a small gap discharge (commonly known as a "snap" discharge) of the membrane electrode Kong Chuyi under long-term operation or abnormal conditions (such as membrane electrode breakage, impurity blockage, gas permeation, or pressure fluctuations), which is a typical manifestation of electrolyzer leakage and is also a precursor to electrolyzer explosion or severe failure. At present, the safety state of the electrolytic tank is generally monitored by adopting the following technical means in industry, namely 1. Single-cell voltage monitoring is carried out, namely, when the voltage is obviously reduced (for example, 10% -20% lower than a normal value) by detecting the voltage value of each electrolytic cell, the membrane electrode is judged to be possibly damaged or leaked. The method has the limitation that the initial stage of discharge can only affect local micro areas, the whole voltage of a single cell is not obviously changed, and early warning can not be realized. 2. Temperature monitoring by detecting partial overheating of the electrolyzer by a temperature sensor (extra heat is generated by the discharge), this method being limited in that temperature changes require heat accumulation, with a response that lags behind the discharge. 3. Pressure monitoring, namely monitoring the sudden change of the pressure of a hydrogen/oxygen outlet (such as pressure fluctuation caused by leakage), wherein hysteresis exists in the method as well, and the discharge phenomenon cannot be directly related. Therefore, we want to develop a device and a method for monitoring the leakage discharge of the electrolytic cell to solve the technical problems of lag monitoring response and high leakage detection rate in the prior art. Disclosure of Invention In order to solve the problems, the invention aims to provide a device and a method for detecting the electric leakage and discharge of an electrolytic tank, wherein the device and the method have the advantages of timely monitoring response and low omission factor. The technical scheme includes that the device for monitoring the electric leakage and discharge of the electrolytic cell comprises a power grid power supply unit, a contactor, a hydrogen production power supply, a proton exchange membrane electrolytic cell body, at least one pickup, a controller, an alarm unit, a valve control unit and a signal conditioner, wherein the power grid power supply unit is connected with the hydrogen production power supply through the contactor, the proton exchange membrane electrolytic cell body is respectively connected with the hydrogen production power supply and the valve control unit, the pickup is arranged around the proton exchange membrane electrolytic cell body and used for collecting sound signals in the operation process of the proton exchange membrane electrolytic cell body, the pickup is connected with the signal conditioner, and the controller is respectively connected with the signal conditioner, the alarm unit, the valve control unit and the contactor. Preferably, the device for monitoring the electric leakage discharge of the electrolytic tank is further characterized in that the controller is a PLC controller. Preferably, the device for monitoring the electric leakage and discharge of the electrolytic tank is further arranged in a mode that the PLC is internally provided with a sound characteristic analysis algorithm. Preferably, the device for monitoring the electric leakage discharge of the electrolytic tank is further characterized in that the power grid power supply unit supplies 380V alternating current. Preferably, the device for monitoring the electric leakage discharge of the electrolytic cell in the invention is further arranged that the valve control unit comprises a hydrogen outlet electromagnetic valve, an oxygen outlet electromagnetic valve and a water supply pipeline electric valve. Preferably, the device for monitoring the electric leakage and discharge of the electrolytic cell is further provided with two sound collectors, wherein one sound collector is arranged at the upper side surface position of the proton exchange membrane electrolytic cell body, and the other sound collector is arranged at the lower side surface position of the proton exchange membrane electrolytic cell body. Preferably, the device for monitoring the electric leakage discha