What are the reasons for a high alkali concentration at the electrolyte outlet?
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This post was last edited by sunjl1981 on 2013-1-6 22:19. What are the reasons for a high alkali concentration at the electrolyte outlet? # hcbbs
It mainly depends on the flow rate and concentration of the alkaline solution in the circulation; if the concentration of the alkaline solution at the outlet of the electrolyzer is too high, more water can be added. Control it so that it doesn’t get too high.
The poster’s question: The concentration of the catholyte is monitored online by the concentration transmitter DT—274. Deionized water is added to the catholyte to control its concentration. The current used in electrolysis determines the output of caustic soda, and the flow rate of deionized water added is directly related to the electrolysis current. The product of the total electrolysis current and 0.148 serves as the set value for regulating the deionized water flow rate; thus, a proportional adjustment is achieved between the total electrolysis current and the deionized water flow rate. Additionally, online concentration control of the catholyte serves as the main loop, while deionized water flow rate control functions as the secondary loop, forming a cascade control system. During the startup of electrolysis, the ratio control loop is activated, while during stable operation the cascade control loop can be used; the control method is selected by the operator based on the actual operating conditions of the electrolyzer. Well, the possible reasons for this problem are: (1) Instrument failure: the pure water control valves in the tank, IIZA-230, DT-274, etc
The reasons for a high electrolyte concentration include low water level, high current density, too thick a membrane, and high saltwater concentration.