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SUMMARY A program was successfully completed that resulted in the development of a Static Feed Water Electrolysis Module (SFWEM). During a 94-day endurance test the SFWEM demonstrated feed water cavity degassing was no longer needed. The module was designed to generate 0.907 kg/d (2.021b/day) of oxygen (02) at an operating pressure and temperature of 1724 kN/m (250 psia) and 352K (175F), respectively. The module used an alkaline electrolyte (potassium hydroxide (KOH)) supported in a customized porous asbestos matrix. Feed water was statically added to the module using a pressure referenced accumulator. Water feed to the electrolysis site in each cell was added by water vapor diffusing through the hydrogen (H2) cavity and into the electrolyte within the porous electrode. Waste heat generated by the electrochemical reactions was removed by circulati g water t rough a coolant cavity in each cell. The cell active area was 92.9 cm (0.1 ft ). The "cell density" of the module was reflected by three cells per 2.54 cm (1 in). The SFWEM consisted of six cells plus two endplates to support the cells. Control and monitor instrumentation for the SFWEM was designed, fabricated, and used to operate the SFWEM as a self-contained subsystem with automatic start, stop, and monitoring features for ease of operation and protection of equipment and personnel. The test system was capable of pressure control from 103 to 2758 kN/m (15 to 400 psia), temperature control from 397 to 377K (75 to 220F), and current control from 0 to 50 amps (0 to 538 mA/cm (500 ASF)) at voltages from 0 to 20 volts. Design and fabrication techniques were arrived at after completing four studies. The designs of the SFWEM and its test system were based on a literature survey of water electrolysis modules' and systems' problems. The problems identified and eliminated were (1) the need for feed cavity degassing, (2) the need for condenser/separators, (3) lack of instrumentation for protection, (4) lack of positive module temperature control, (5) lack of automatic one-button start/stop control, and (6) circulation of bulk electrolyte. The second study examined the maintainability aspects of water electrolysis modules. An insitu submodule maintenance approach was selected and the SFWEM designed to be compatible with this approach. The third study evaluated the applicable heat removal techniques. An internal liquid-cooled method was selected because it offered the lowest equivalent weight. The fourth study evaluated injection molding and machining as fabrication techniques for polysulfone cell parts. The selection criteria used were cost and performance. Injection molding was selected because it offered advantages in both areas. A static feed water electrolysis test program was successfully completed. This program consisted of (1) test system checkout tests, (2) single cell Design Verification Tests (DVTs), (3) module DVT and parametric tests, (4) module endurance test, and (5) single cell advanced electrode and matrix evaluation tests. A single cell using SFWEM components was successfully tested for design verifi- cation of the SFWEM. These tests included (1) current densities from 0 to 1076 1 £i/e systems, Anc.PDF Image | WATER ELECTROLYSIS MODULE
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