What causes a sudden increase in the cell voltage of a zero-gap electrolyzer?
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What causes a sudden increase in the cell voltage of a zero-gap electrolyzer? On May 25th, the system was shut down; both polarization and pressure difference were within normal ranges. Only one membrane was tested for leaks, and it was replaced promptly. When the system was restarted on May 26th, the voltage in tank A increased by 10V inexplicably, while the voltage in tank B remained the same as before shutdown.
Is there a problem with the voltage monitoring system? Are there any fluctuations in the process parameters? Generally, the voltage shouldn’t increase by that much
If the vehicle is parked properly and polarization, cycling, etc. are carried out correctly, it generally will not cause damage to the coating; and even if damage does occur, it will not be evident unless it reaches a critical level. By comparing the A and B tanks, the issue with the quality of the brine can also be ruled out; however, it is recommended to analyze the quality and concentration of the brine further, as well as check whether valve 41 in each tank is functioning properly. Is the temperature difference between the two tanks significant? Regarding voltage detection, I wonder if the original poster has used a voltmeter to make actual measurements and make comparisons.
There are many reasons for the abnormal increase in voltage after the electrolysis system is started. First, determine whether the voltage rises across the entire system or only in certain parts; it’s best to shut down the system and open the electrolyzer for inspection
The data you’ve provided is too limited. From what you’ve sent, it seems that you’re mainly suspecting the coating; you need to check whether all the parameters at the inlet and outlet of your electrolyzer are normal, rule out any issues with the membrane, and also consider the cell temperature. Measure the voltage on-site to rule out problems with the instruments. Only after all these possibilities have been ruled out can you consider the coating as a potential issue.
If the cell voltage is too high, check the cell temperature. If the cell temperature is also high, and it turns out that the alkali concentration is too high as well along with a high proportion of brine entering the cells, then it is recommended to check whether there is any deviation in the DC sensor
You have provided too little data. 1. Measure the cell voltage in practice. 2. Compare the cell temperature. 3. Concentrations at the anode and cathode. 4. Flow rates at the anode and cathode. 5. Analysis parameters of the brine fed into the cell. 6. Electrode coating, etc. 7. Is the voltage output by the rectifier accurate?