Why does an excessively low slot pressure difference cause voltage instability? ?

Simply put, the voltage in an ion membrane cell consists of the same components as those in a diaphragm cell, including the electrolyte voltage drop and the membrane voltage drop. Since the anode solution and cathode solution are the main components contributing to the electrolyte voltage drop, the membrane voltage is primarily due to the sulfonic acid layer on the anode side, while the voltage drop caused by the carboxylic acid layer on the cathode side can be ignored. Under normal operating conditions, the ion membrane adheres tightly to the surface of the anode mesh, which means that the hydraulic drop across the anode is minimal. When the operating pressure difference between the anode chamber and the cathode chamber decreases, it causes the membrane to vibrate, leading to the membrane oscillating away from the anode mesh and thus resulting in a significant voltage drop across the anode solution. Of course, this voltage drop also fluctuates along with the vibrations of the membrane. Although the voltage drop in each individual cell is not very large, when dozens or even hundreds of such cells are considered together, the total voltage drop becomes considerable. This is also the reason for the unstable slot voltage as observed on the surface.