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in these lines are used to balance the flowmeters. Valves in the discharge electrolyte lines from the modules are provided so that a disabled module canbeisolatedfromthecirculationloop. Duringnormaloperation,these discharge valves are fully open. Downstream of the discharge valves, the electrolyte is manifolded together and enters the electrolyte reservoir to be returned to the pump. Water feed for the electrolysis process is supplied by direct injection of liquid water into the reservoir. A flow control valve provides the proper feed rate and a solenoid valve is actuated when feed is required. 2.2.3 OxygenandHydrogenDelivery Hydrogen and oxygen are delivered from the electrolysis modules at approximately10.35 kN/m2 (1.5 psig). 2.2.4 NitrogenPurge Nitrogen purge is provided to maintain gas-liquid differential pressure during startup and interim shutdown. When this function is actuated, either manually or automatically during safety shutdown, inlet and outlet solenoid valves in the hydrogen and oxygen discharge lines open, allowing nitrogen to flow through the oxygen and hydrogen chambers of the electrolysis modules. A micrometer valve is used to adjust the nitrogen flow rate. 2.3 AUTOMATIC CONTROLS The Electrolytic Oxygen Generator is designed to function in an auto- maticmodeduringnormaloperation. Startupandshutdowncanbeaccomplished either manually or automatically. The individual control functions are des- cribed in the following paragraphs. 2.3.1 AutomaticStartupandShutdown The automatic startup feature performs the following functions in a sequentialmanner. Itturnsontheelectrolytepump,resetsthesystem,enables all automaticsafetyshutdownfunctions,commandsthehigh,low,andautomatic current modes to the modules, and enables the automatic water feed system. The automatic startup is controlled by the use of an electronic digital counter. 5PDF Image | WATER ELECTROLYSIS SYSTEM REFURBISHMENT
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