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One advantage of the DM is the almost total utilization of water processed by the main electrolysis system, including that normally lost through humidification of the product 02 and H,. By operating the electrolytic dehumidifier upstream of any system pressure regulators, trace heating of lines and regulators, which are electrical power consumers, is eliminated. Also, the electrolytic method eliminates condenser/separators required by all other low pressure water electrol- ysis systems where expansion alone of product gases does not achieve the minimum allowable partial water vapor pressure. Design Specifications The detailed design specifications to which the DM was designed are listed in Table 8. The DM was sized to dehumidify the product gases of a one-man, capacity O generating system allowing it to readily interface with the one-man capacity SFWEM. The amount of water carried in the product gases of the SFWEM is a function of its operating pressure. The lower the pressure, the greater the amount of water and, therefore, th2 greater the capacity required for the DM. A minimum pressure level of 345 kN/m (50 psia) was selected and used to size the one-man capacity DM. The capacity of the SFWEM is expressed in 02 production per unit time. The amount of water carried by both product gases is therefore best calculated and expressed as a function of 02 production rate and the specific humidity of the exhaust 02 gas only. The resulting formula shows that the total amount of water carried out by the SFWEM as humidity is equal to three times the 02 production rate times the specific humidity of the product 02. Based on these calculations, the number of cells required for the DM is readily calculated and expressed as the function of 02 operating pressure for a given electrolyte charge concentration and operating temperature. Table 9 shows 02 operating pressure, specific humidity of t e product 02, and the number of cells required for the DM at both 50 and 30 A/ft . Three cells were selected for the DM to allow operation at 02 pressures down to 50 psia with the SFWEM at a design capacity of 0.907 kg/d (2.0 lb/day) of 0O At the design pressure of 1724 kN/m2 (250 psia) the DM is capable of dehumiAifying the product gases from a four- to five-man 02 generating system. Process Description The major process occurring within the DM is the electrochemical decomposition of water. This process occurs within the electrode-cell matrix-electrode composite. The oxidation reaction in an acid system is 2H20=02+4H +4e The reduction reaction is 2H +2e =H2 67 (9) (10) IcZ Sstcms, Mc.PDF Image | WATER ELECTROLYSIS MODULE
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