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Zi/c Systcms Jtnc. elimination or minimization of any metallic parts within the liquid loop or within the feed cavities was essential. The rate of stray electrolysis was a function of the voltage differential between two metallic surfaces contacted by a common electrolyte media. The distance between these metallic parts and the electrolyte media resistivity also affected the amount of gases liberated for a given voltage difference. The greater the distance for a given voltage, the smaller the chance of gas liberation. To minimize the electrical driving potentials the module must not be electrically grounded but must be allowed to "float." The absence of a metallic recirculation loop and the presence of only water in the water feed supply line (unmixed with KOH due to density gradients) also minimizes stray electrolysis. The SFWEM was designed accordingly. Dissolved Gases The water fed to the SFWEM tends to be saturated with air or N2 at its supply or storage pressure and temperature. These dissolved gases are potential sources for gas accumulation in the water feed compartment. To eliminate this source of gassing required investigation of the parameters that affect gas solubility. Solubility of gases in water is a function of absolute pressure, temperature, and type of gas involved. Solubility of gases in aqueous solutions of electro- lytes is governed by these same parameters, but in addition is also affected by the presence of the electrolyte. In general, solubility of gases decreases with increase in temperature, electrolyte concentration, and absolute pressure level. For the typical SFWEM operating conditions, the solubility of air in the feed compartment liquid is only 1/15 that of the incoming feed water. This decrease results due to a factor of ten reduction caused by the 35% KOH concentration and a factor of 1.5 reduction caused by the temperature increase from 297 to 352K (75 to 175F). Since an aqueous solution of electrolyte is used in the feed cavities of a SFWEM and since elevated temperatures are desired for optimum performance, operating pressure remains the only small parameter that can be adjusted to preclude gas dissolution within the feed compartments. For the SFWEM design the total operating pressure must be raised by a ratio equivalent to the ratio in loss of solubility due to the combined effects of temperature and the electrolyte concentration. Since solubility is decreased by a factor of 15, operating pressure must be increased by the same factor above the feed water source pres ure. This means a minimum projected operating pressure for the SFWEM of 1551 kN/m (225 psia). Module Sizing The size of an electrolysis module is basically determined by 02 generation requirements. Once this number has been established trades between number of cells, current flowing, current density and active electrode area and dimension 16PDF Image | WATER ELECTROLYSIS MODULE
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