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Effect of Matrices The cell matrix used in the SFWEM consists of reconstituted asbestos. This type of matrix yields good performance, however, its operating temperature must remain below 355K (180F) for long-term operation because KOH reacts with the asbestos fiber material. This restriction on temperature prevents the decrease in power possible by operating at elevated temperatures. A more KOH-resistant matrix material is desirable. Two matrix materials were tested in the single cell. Figure 30 shows the cell terminal voltage obtained as a function of current density. Composition C is made from a material considered to be resistant to KOH at temperatures up to 445K (340F). The figure shows that Composition C produces a lower terminal voltage throughout the operating range reaching a 58 mV difference at 215 mA/cm2 (200 ASF). While Composition C exhibits high temperature properties and slightly better performance than the baseline matrix, its bubble pressure, when supported by the porous Ni plaq e electrodes, is less than the baseline matrix although capable of a 68.9 kN/m (10 psi) differential. DEHUMIDIFIER MODULE Dehumidification of product gases from water electrolysis systems is necessary when the exhaust gases have a dew point greater than the maximum allowable dew point level within the cabin or greater than the dry bulb temperature of the media through which the plumbing passes. Normally, this level is 287K (57F) which is equivalent to a water vapor partial pressure of 1.6 kN/m2 (12 mm Hg). Various methods are available to remove water vapor from the product gases. Four practical approaches are: 1. Utilization of condenser/separators. 2. Operation of the electrolysis system at a sufficiently high pressure level to insure that after expansion of the product gases the partial wate vapor pressure will be less than the maximum allowable of 1.6 kN/m (12 mm Hg). 3. The addition of an electrochemical Dehumidifier Module (DM) in the product gas lines. 4. A combination of two or more of the above. The DM concept uses water vapor electrolysis to remove the water vapor carried with the product gases. The 02 and H2 from the main electrolysis module are passed respectively through the anode and cathode cavities of the water vapor electrolysis cells of the DM. The affinity for moisture of the DM's electrolyte causes the water vapor to be transferred into the cell where, as a result of an imposed current, the water is electrolyzed to form additional 02 and H2. 65 Zie Systes, Inc.PDF Image | WATER ELECTROLYSIS MODULE
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