Development of the Zinc-Chlorine Battery for Utility

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Development of the Zinc-Chlorine Battery for Utility ( development-zinc-chlorine-battery-utility )

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Table 36-3 OUTLET CHLORINE CONCENTRATIONS FROM A 1.5 ATM, 1% CO. INLET Temperature at Outlet Total Pressure Cl2 Partial Pressure Partial Pressure C02 Mol Fraction C02 Moles Cl2 removed/cycle Coolant Heat Load 6°C “ 1.5 ATM 0.65 ATM 0.85 ATM 0.57 14.8 Mole 51.8 Watts 0.0236 MOLES C02/HR (Diffusional Mixing not Considered) 2 8°C - 1.5 ATM 0.81 ATM 0.69 ATM 0.46 16.6 Mole 51.2 watts Hydrate formation, due to the partial pressure limitation, is applicable to an initial stage of the device to concentrate inerts using available coolant in an auxiliary former. Thermal diffusion, due to large area and parasitic power requirements, could only be used as a final stage in a device with pre-concentrated stream of inerts and chlorine serving as the feed. Because of its low molecular weight, un­ reacted H2 present in the system at a concentration of 0.5% to 1.5% will interfere to some extent with the separation of the two heavier gases, CC>2 and Cl2. The extent of this interference was not investigated in this study, due to the unavaila­ bility of relatively simple analytical methods for the three gases. The electrowinning cell represents a method which is applicable over the entire concentration range and therefore could serve as a basis for a "single method device". Estimated parasitic powere are reasonable, being less than 130 watts in the most conservative assumptions. The technology is known with experimental demonstration of feasibility already completed. The limitation of the method is the relatively large electrode areas projected from the current densities used in present battery tech­ nology. With experimental work, however, it is considered probable that current density can be substantially increased. 36-14

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