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Ziff Systcns. 7nc. 10. Insufficient attention to minimize intra-cell electrical resistance (IR) losses resulted in high power requirements per pound of 02 generated. 11. Circulation of bulk liquid electrolyte increased the frequency and probability of electrolyte leakage causing safety and maintenance problems. Static Feed Water Electrolysis Module Problems Based on the literature survey and on the Contractor's background experience, the following problems were identified as being unique to static feed water electrolysis modules and subsystems. 1. 2. 3. 4. 5. 6. The need for degassing of the feed water or the cell feed water cavities contributed to system complexity and maintenance procedures unique to the static feed approach. The addition of a loop to circulate the liquid contained in the feed water cavities for either temperature control or feed water compartment degassingcontributedtomoduleandsubsystemproblems. Theseproblems resulted from using one single manifold common to both the water feed and the electrolyte circulation inlet port. As a result, electrolyte concentration shifts and concentration buildup in feed cavities occurred. Also, the presence of the metallic recirculation loop plumbing in contact with the KOH caused stray electrolysis i.e., an increase in gas levels in the feed cavities. Liquid purging ports and manifolds in the modules were improperly sized resulting in high pressure differentials through the feed water cavities during flushing. This upset the module pressure differentials and resulted in eleco~te maldistributions and H2 gas to feed water cavity breakthrough. Retention of the water feed matrix between perforated plastic support sheets introduced an extremely high diffusion resistance to KOH and water to and from the evaporation site in the feed matrix. The resulting high electrolyte concentration Wgys caused cell dryout and limited high current density operation. Structural blockage and reduction of the cross-sectional area for water vapor diffusion from the feed matrix to the electrolysis site resulted in high cell matrix electrolyte concentration accompanied by large decreases( n8 lectrolyte volume with eventual cell dryout and gas crossovers. Water feed manifolds common to all cells in a module were located at the bottom of the module which caused uneven electrolyte concentration shifts in the feed compartments during water feed. These shifts were caused by the difference in electrolyte and feed water densities. 12PDF Image | WATER ELECTROLYSIS MODULE
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