Abstract: Real-time data from cells is recorded during operation of an electrolyzer. Synthetic data is generated based on historical data of the electrolyzer and the cells, the synthetic data comprising synthetic cell voltages and synthetic product output flow, synthetic anolyte pH, feed brine pH, or oxygen in chlorine gas concentration of the electrolyzer. Cell-specific k-factors or U0 are determined from the historical data. A slow contamination is detected when a difference between the synthetic product output flow, synthetic anolyte pH, feed brine pH, or oxygen in chlorine gas concentration and a real-time product output flow, anolyte pH, feed brine pH, or oxygen in chlorine gas concentration exceeds a first threshold. A fast contamination is detected when cell-specific k-factors or U0 exceed a second threshold and a trend of a difference between the synthetic cell voltages and real-time cell voltages or a derivative of the difference meets or exceeds a conditional logic rule.

Abstract: Methods, systems, and assemblies for detecting faults in an electrolyser having a plurality of electrolysis cells are described. The method comprises obtaining voltage measurements of the electrolysis cells during operation of the electrolyser, generating synthetic cell voltages for the electrolysis cells using a neural network architecture that takes into account normal cell degradation based on cell-specific parameters, comparing the voltage measurements to the synthetic cell voltages for corresponding ones of the electrolysis cells to obtain voltage differences, and detecting a fault in the electrolyser when at least one of the voltage differences reaches a threshold.

Abstract: There is described a method for determining single cell current efficiency in an electrolyser, the method comprising: measuring voltage of a plurality of single cells in the electrolyser; measuring electrolyser current feeding the single cells; detecting one of a shutdown period and a start-up period; and for each single cell: determining a time t taken for a voltage level to reach a predetermined occurrence in a voltage curve after a polarization current has been triggered; and calculating cell current efficiency as a function of the time t.

Abstract: There is described a method and a system for evaluating damage of a plurality of cells in an electrolyser. The method comprises acquiring a voltage for each one of the cells; comparing the voltage to at least two threshold voltage levels; classifying the cells as one of: severely damaged cells, non-severely damaged cells and undamaged cells, based on the comparison of the voltage with the at least two threshold voltage levels; and deactivating the cells classified as severely damaged cells from the electrolyser.

Abstract: There is described a method and a system for evaluating damage of a plurality of cells in an electrolyser. The method comprises acquiring a voltage for each one of the cells; comparing the voltage to at least two threshold voltage levels; classifying the cells as one of: severely damaged cells, non-severely damaged cells and undamaged cells, based on the comparison of the voltage with the at least two threshold voltage levels; and deactivating the cells classified as severely damaged cells from the electrolyser.

Abstract: The present invention concerns a method and system for monitoring electrolyzer performances and for diagnosing and predictive identification of faults and events that could affect the manufacturing processes that uses electrolyzers. The system has a plurality of acquisition and transmission units, each of the acquisition and transmission units measuring a plurality of variables related to a respective electrolyzer and for transmitting these variables; a database and data management unit for recording the variables transmitted by each of the acquisition and transmission units; a monitoring unit for monitoring the variables; and an intelligent data analysis and fault diagnosis unit for analyzing the variables and diagnosing events. All of the units are interconnected through a communication unit.

Abstract: The present invention concerns a method and apparatus for monitoring electrolyser performances and for diagnosing and predictive identification of faults and events that could affect the manufacturing processes that uses electrolysers. The system has a plurality of acquisition and transmission units, each of the acquisition and transmission units measuring a plurality of variables related to a respective electrolyser and for transmitting these variables; a database and data management unit for recording the variables transmitted by each of the acquisition and transmission units; a monitoring unit for monitoring the variables; and an intelligent data analysis and fault diagnosis unit for analysing the variables and diagnosing events. All of the units are interconnected through a communication unit.