Chlor-O-Safe - Advanced

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Chlor-o-Safe Hypochlorite Generator - The fully integrated solution for disinfection

The Chlor-o-Safe system developed by ElectroCell is an advanced hypochlorite generator, based on high technology, and serves as a fully integrated solution for disinfection of all kinds of different polluted media i.e. at:

• Swimming Pools
• Municipal water plants
• Industrial plants
• Power plants
• Food industry
• Chemical manufacturers

Hypochlorite production

The hart of the Chlor-o-Safe system is the electrochemical cell. The unit is in principle built up by parallel electrode plates (anodes + cathodes). Between these plates a controlled amount of salt solution (approx 20 – 30 gram of NaCl), is injected.
The production of hypochlorite is basically done by reacting Cl₂ (chlorine gas) with sodium hydroxide (NaOH). This will react according to:

2 NaOH + Cl₂ → NaClO + NaCl + H2O

But the first step occur when applying DC current to the electrodes. This will electrolyze the salt solution according to:

2 Cl- → Cl₂ + 2 e- (anode)
2 H2O + 2 e- → 2 OH- + H2 (cathode)

The chlorine gas will further react in the alkaline water solution to sodium hypochlorite and enter the degassing vessel. The solution will approx contain:

NaClO ~ 8-9 gram Cl₂ / liter (NaOH ~ 0.0012 gram / liter, water and salt)

The integrated degassing vessel with air-flow ensures that the produced hydrogen is safely vented out of the system and the produced hypochlorite is fed from the bottom of the vessel directly to the dosing point “In-line” or to a “Buffer” tank.
The system operates with a constant current out-put from the rectifier and the current is depending on the required production capacity (cell size). The current and production of hypochlorite will automatically stop when the level in the degassing vessel reaches “max level” or actual alarms occur. In the same way a “low level” sensor will re-start the production.

Controls and Alarms

The hypochlorite generator is controlled by a PLC-unit and a “touch-button” display panel or an integrated “touch-screen” on the control cabinet where all necessary information can be shown.
The integrated control system includes control / monitoring of operation and safety functions, on the complete system:

• Sensor / alarm for leakage
• Temperature sensor in degassing vessel and surroundings
• Control of air-flow through degassing vessel (hydrogen safety)
• Production control by level sensors in degassing vessel (min / low / max)
• Flow control for soft water to cell
• Control of water softener unit (production stop when regenerating)
• Control of dosing rate at ejectors
• The control system will self-detect if it is running in frequency-modulated mode or by signals from local measuring device
• Various control functions can be added on demand (option)
• The system can be integrated with external chlorine measuring equipment (option)
• Outlet alarm signals for remote detection are available (option)
• Outlet signals can be integrated with CTS (option)

The cell voltage from the rectifier is controlled in a way that a deviation of +/- 0.5 – 1.5 volt (each voltage step) from the nominal setting will shut down the system.

At stand-by, a protective voltage (0.7 V per voltage step), across the cell will be applied to prevent damage to the anode coating.

The temperature on produced hypochlorite is controlled by a sensor installed in the discharge pipe of the cell. If temperature exceeds 52 degrees Celsius, the production will shut down.

Soft water supply to the unit is controlled by a flow sensor (min/max alarm) to ensure the right flow to the electrochemical cell. And the system will shut down if the flow is not kept within set limits.

The salt saturation tank has level valves for automatic start / stop of soft water supply for brine making.

All the above functions are controlled and monitoring on a “touch-button” display panel or an integrated “touch-screen” on the front of the control cabinet of the hypochlorite generator.

Dosing

The system can be build as a “Buffer” (storage) or an “In-line” solution where dosing is done by pumps or suction with ejectors.

Ejector dosing is preferable while the hypochlorite is kept under equalized pressure (or vacuum) with low risk of leakage and injury on operators.

The dosing is controlled by pressure difference over the ejectors at each dosing point. The amount of dosing is adjusted by control valves and the consumption of hypochlorite is set by frequency modulated pumps controlled by signals from “external” measuring equipment.

Both solutions (”Buffer” / ”In-line”) have the possibility to manage an ”unlimited” amount of independent dosing points.

“In-line” systems can be made in cabinets (up to 3 dosing points) or in separate rooms if required by local rules and regulations. The cabinet solution with integrated waste tray and ventilation is considered as an “independent room for dosing” and do not require other facilities.

Show diagram showing complete ”In-line” system (2 dosing points, swimming pools)

Acid dosing

As a compliment to the Chlor-o-Safe concept, a cabinet designed after the same principle can be supplied for control of pH-value by hydrochloric acid (HCl) or sulphuric acid (H₂SO₄) dosing.