Seawater Electrochlorination

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  5. Seawater Electrochlorination

ULSeawater™ systems are, as the name implies, applicable only in coastal areas and offshores. These systems are applied to control biological activity in all forms of circulating cooling systems where seawater is the cooling media such as power stations, refinery complexes, fertilizer plants, desalination plants, etc. Many of these applications are remote hence difficult to utilize most of the disinfection methods, making seawater electrochlorination system very cost-effective.

ULSeawater™ utilizes seawater feed with high flow rates to help control cathode fouling from the naturally occurring magnesium and calcium in seawater. As a result, the product concentration of sodium hypochlorite is low (max. 2500 ppm) and operating current efficiency is high, as the power consumption for ULSeawater™ electrolyzers is <4.4 kWh/kgCl2.  Due to the seawater providing a “free” source of salt, these systems contain smaller equipment of less variety than brine electrolysis systems.

Seawater Electrochlorination

The equipment for a seawater system is shown below, and generally operates in the manner described:

  • Inlet seawater strainers: Essential for removing particulate material from the seawater feed stream
  • Seawater booster pumps: Provide seawater at the appropriate pressure and flow to the electrolyzer system
  • Electrolyzer cell or cells: Electrolyzes the seawater feed to sodium hypochlorite
  • DC power rectifier: Provides the direct current for electrolysis
  • Storage/degassing tank: For removing by-product hydrogen and product storage to meet shock dosing requirements
  • Hydrogen dilution blowers: Provided to dilute the by-product hydrogen produced during the electrolysis process. These blowers may be applied to either tank or cyclone hydrogen removal systems
  • Dosing pumps: Provide the needed disinfection dose to distant or high-pressure applications. Direct current variation controls the dose rate rather than control of the pump flow
  • Cell cleaning system: Used to remove the calcareous material deposited on the cathode