Method and system for electrolyser single cell current efficiency

摘要

There is described a method for determining single cell current efficiency in an electrolyzer, the method comprising: measuring voltage of a plurality of single cells in the electrolyzer; measuring electrolyzer 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.

主权项

1. 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 using the electrolyser current as measured; once the shutdown or start-up period has been detected, for each single cell:
determining, from the voltage as measured, a time t taken for a voltage level to reach a predetermined occurrence in a voltage curve after a polarization current has been triggered during the shutdown or startup period; andcalculating cell current efficiency as a function of the time t, wherein:
at shutdown, cells that take longer to reach the predetermined occurrence are classified as more efficient than cells that take less time; andat startup, cells that take longer to reach the predetermined occurrence are classified as less efficient than cells that take less time; and operating the electrolyser while taking into account cell classification for current efficiency.