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Section 2 SYSTEM DESCRIPTION 2.1 INTRODUCTION TheNASA-LMSCElectrolyticOxygenGeneratorasconfiguredforthe 182- Day Test at McDonnell Douglas is described in this section. The unit is designed to be operated in a completely automatic mode, including startup, shutdown, and safetyshutdownwithlimitedfaultdiagnosis. Ninety-threechannelsofsystem data are provided at the unit interface. Oxygen production rate is variable from 0 to 4.55 kg/day (10 lb/day). The outside dimensions of the system closure are 0.61 m (24 in.) across the front panel, 0.56 m (22 in.) high, and 0.79 m (31 in.) deep. 2.2 LECTROMECHANICAL COMPONENTS A schematic of the Electrolytic Oxygen Generator system is shown in Figure1. Theconceptsemployedinthesystemdesignincludetheuseofdual- matrix, liquid center electrolysis cells with a circulating 30% potassium hydroxide electrolyte. 2.2.1 ElectrolysisModules The generating unit consists of four electrolysis modules, each containing 16 cells connected hydraulically in parallel and divided electrically into two 8-cellbanks. Cellswithinan8-cellelectricalbankareconnectedinseries. Peripheralmanifoldingwithinthemoduleprovidesseparatepathsforelectrolyte circulation,oxygenandhydrogendischarge,andnitrogenpurge. Differential pressure control is used to maintain gas-liquid phase separation across absorbent matrices contiguous to the electrodes. 2.2.2 ElectrolyteCirculation Electrolyte is pumped through a circulation loop using one of two in-line magnetic-coupledcentrifugal pumps; the second pump is an in-line spare. The electrolyte leaving the pump passes through the tube side of a shell-and-tube heat exchanger. Coolant supplied to the shell side removes waste heat generated in the electrolysis modules. The electrolyte flow is split at a set of flow- meters into four paths leading to the electrolysis modules. Flow control valves 3PDF Image | WATER ELECTROLYSIS SYSTEM REFURBISHMENT
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