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Zile Systcms, jc. (TC3 and TC4), and dew point sampling ports. The 02 pressure is controlled by a backpressure regulator (BP2) and the H pressure is controlled by a dome-loaded backpressure regulator (BPI) referenced by the 0 steam pressure. The gas flow rates are measured downstream of the regulators y soap bubble flowmeters. To prevent excessive dehydration of the DM it must be operated with a constant voltage/constant current automatic crossover power supply. The current will remain constant at the set value (between 3 and 5A) until the DM voltage reaches the set value (between 6 and 6.6 volts, i.e., 2 to 2.2 volts per cell). The current will then drop to keep the voltage at the set value. This method of operation assures that all water removed from the gases by the electrolyte is electrolyzed. Figure 33 is a photograph of the GSA with the DM in place. All the lines carrying moist gases were covered with insulation to prevent condensa- tion, but have been left out of the photograph for clarity.2 All 0 lines and components in the system were cleaned for 2069 to 3448 kN/m (300 o 500 psia) O service. The test stand is complete with its own dew point sensors, humidifiers with heaters, separate H2 and 02 pressure test gauges, and thermocouple temperature sensors. DEHUMIDIFIER MODULE TESTING Following fabrication of the DM and its test system the DM was charged with 51% w/w H2SO4 and installed in its test system. Preliminary performance evaluation tests were then performed. Figure 34 shows a voltage current characteristic for the DM cells obtained during its initial operation. The DM was operated for a total of 72 hours, including 10 hours of integrated operation with the SFWEM. Figure 35 shows the DM average cell voltage during this testing. At one point early in the testing, measurements were made of DM O0 inlet flow, 02 outlet flow, and current. Based on these measurements the module was producing 98% of the theoretical 0 flow. Dew point measurements of inlet and outlet gases have also shown that tie DM was functioning as planned. During the shakedown tests, a measurement showed that the inlet dew point of 295K (72F) was being reduced to 283K (50F). These tests have been limited in duration. More extensive parametric endurance and integrated testing is needed. CONCLUSIONS AND RECOMMENDATIONS The following conclusions are a result of this development program: 1. The advanced SFWEM can be operated without water2feed cavity degassing. This2was demonstrated for 440 hours at 129 mA/c (120 ASF) and 1724 2. 3. kN/m2 (250 psia) and for 488 hours at 161 mA/cm (150 ASF) and 807 ..kN/m (117 psia) during the endurance test. The advanced SFWEM can be operated for 94 days as was shown by the successful endurance test performed. Control and monitor instrumentation can be designed for the SFWEM to provide fail-safe automatic unattended operation as was demonstrated by the instrumentation designed and used for SFWEM testing. 74PDF Image | WATER ELECTROLYSIS MODULE
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