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Lie Systems. INC. electrical energy + H20 = H2 + 1/2 02 + heat (3) Schematically, these reactions are shown in Figure 1. The water to be elec trolyzed is supplied statically via water vapor diffusion to the cathode side of the cell The additional water components (x + y)(H 20) indicated in the figure are not included in the electrochemical reaction. They represent the water required for humidification of the cathode and anode gases at the electrodes The amount of humidification (x and y) is determined by the pressure, temperature and local concentration of the aqueous electrolyte. Since water is also generated at the anode but must be consumed at the cathode, concentration gradients exist between the two electrodes The magnitude of these gradients is a function of the current density and of the characteristics and configuration of the electrodes and cell matrix. For calculations of humidification requirements, the equivalent concentration of the electrolyte at the respective cell electrode must be used. This value differs from the initial charge concentration and from the anode to the cathode side. Dehydrator Module The reactions occurring at the anode and cathode of the dehydrator cell with an acid electrolyte are- Anode Cathode H20=1/202+2H+ +2e- (4) (5) 02 + heat (6 Schematically, these reactions are shown in Figure 2. The water to be electrolyzed is supplied as water vapor contained in both the incoming H2 and 02 gas streams. This vapor is absorbed in the acid electrolyte due to the latterts lower vapor pressure (as a result of water consumption), and electrolyzed. The result is additional dry product gases. Electrolyte concentration gradients must again be considered when analyzing and designing DM hardware and performance. Oxygen Generation Subsystem Concept Description A conceptional schematic of the OGS using the SFWE concept is shown in Figure 3. The OGS consists of three main parts the combined SFWE and dehydrator modules, awaterfeedtankandaproductgaspressurecontroller(s). OxygenandH2 are generated in the electrolysis module from water supplied by the water feed tank and dried in the DM. The pressure controller (1)maintains the absolute 2H+ + 2e- = H2 resulting in the overall net reaction of electrical energy + H20 = H2 + 1/2 6PDF Image | STATIC FEED WATER ELECTROLYSIS PROCESS
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