Schlumberger

METROL SEA-CELL Electrochlorinator

Prevents growth of living organisms through electrolysis of sea water


The METROL SEA-CELL electrochlorinator is an in situ generator of sodium hypochlorite from saline water, using an electrolytic process. Sodium hypochlorite is one of the most effective oxidizing biocides available.

The hypochlorite solution is stored in the disengagement tank under level control and passes to the dosing point, from where it is discharged to the seawater system by suitable multistage centrifugal dosing pumps. The complete package can be customized and skid-mounted to suit the installation location. 

The transformer/rectifier panel is supplied loose for mounting in an appropriate position in a local control room.

SEA-CELL electrochlorinator concept

The SEA-CELL electrochlorinator is a reliable, self-cleaning generator assembly. Its unique design concept of enclosing the anode-cathode bipolar plates within an integral housing provides a leakproof assembly.

Unlike other cell designs that use the cathode or anode as the containment device for the process fluid, the SEA-CELL electrochlorinator design ensures leak-free operation even in the event of an anode-cathode failure because the plates are mounted inside a substantial polypropylene container.

The use of this series flow design creates a self-cleaning unit that does not require acid cleaning. By using optimal fluid velocities, cell plates are kept free of deposits and efficient removal of hydrogen is achieved.

Hypochlorite generation process

The hypochlorite generation process is based on electrolysis of the sodium chloride in raw seawater as it flows between anodic and cathodic electrodes energized by direct current and successive chemical reactions that take place in the seawater between the products of electrolysis.

Passing direct current through an aqueous solution of sodium chloride causes the chloride ions to migrate to the anode and sodium ions to migrate to the cathode, leading to the generation of chlorine at the anode and hydrogen plus sodium hydroxide at the cathode.

Hydroxyl ions migrate from the cathode area and react with sodium ions and chlorine dissolved in the seawater near the anode to produce sodium hypochlorite.

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