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WEFTEC®.06 shut down system operations to prevent serious damage to the equipment or hazard to the personnel. Water and brine flow meters are essential to confirm a generally accepted water to brine ratio of 10:1. Flow alarms are required to be certain that the cell temperature does not exceed 140oF (60oC) or cell damage will occur. Generally, two operating set points and two alarm points are used for tank level instruments. The operating set points maintain the tank level by operating the system via the control scheme. The low-level alarm set point will stop the pumps and alarm while maintaining generator operation. A high-level alarm setting will alarm and stop generator operation. Residual analysis or ORP analysis is often applied to control dosing pumps or, in the case of seawater systems, DC rectifier operating current. Analog signals are used through a PID controller to assure stable operation of the pump or rectifier. Historically, residual analysis has been the control method of choice, however, as instrumentation becomes more sophisticated ORP is becoming more accepted. The use of chloramines for residual maintenance in water systems requires the comparison of free to combined chlorine concentrations. DC Power Rectifiers - Three major types of rectifier units used in electrocatalytic sodium hypochlorite generation are described in this section. Figure 5 is a photograph of a tap switch voltage control rectifier - These units have no accurate current control mechanism. Rectifier control is provided from transformer primary tap points using a multipoint click switch regulator. The regulator varies the input voltage to the transformer resulting in a secondary voltage variation. For this reason, the rectifier current varies as the solution temperature or salt content changes the cell resistance. For units of this type it is very important that the system has a closely maintained feed water temperature and salinity level. Copyright ©2006 Water Environment Foundation. All Rights Reserved 6341PDF Image | On-Site Sodium Hypochlorite Generation
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