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the operation of the stack were eliminated. Figure 23-4 compares the original schematic of the 20kWh battery with a schematic of the battery in its present state. • • • • • 9 The major hardware deletions hydrate store Cl2 gas injection pump H^/Cl^ reactor glass wool filter in-line spectrophotometer sonic flow meter The electrolyte plumbing external to the stack was also simplified. The battery stack was turned 180° in the hood, thus allowing easier servicing of the electro lytepumpandpiping. Chlorinegaswasprovidedduringdischargefromgascylin ders directly connected to the high pressure side of the electrolyte pump. Finally, the cover to the stack case was replaced due to a fracture in the steel frame. Recommendations Three new pieces of hardware have been purchased for the 20kWh battery, and should be installed during Phase II. The first is a set of titanium-clad copper bus bars, which will allow for external electrical connections of the two banks. This will allow measurement of current distribution between the banks. Furthermore, the bus bars are designed to extend through the sides of the battery case instead of the top. This will reduce the difficulties associated with removing the top in order to observe the cells. The second new piece of hardware is a titanium-coil heat exchanger. It will act both as a heat exchanger and as a medium to enhance chlorine gas absorption during discharge. Thisheatexchangerwillbesituatedinthemainelectrolyteplumbing from the pump, as it will be replacing the titanium mesh absorber. Finally, a ceramic filter also will be placed in the main electrolyte plumbing. This filter will not introduce contaminants to the system, and the cartridge could easily be removed when filtering is not needed. 23-8PDF Image | Development of the Zinc-Chlorine Battery for Utility
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