• Pristine Water

Brine Electrochlorinators - Continuous Production Electrochlorinator

Equipment used in Continuous Production Electrochlorinators

Brine Preparation Tank

The Brine preparation Tank is either made of HDPE of FRP in small capacity systems and RCC or FRP in large capacity systems. These tanks are provided with Agitators, multi-grade filter media, float valve, drain valve, etc. These pumps are required if inlet seawater is not provided at a pressure of at least 2 kg/cm3. These pumps are normally made up of Duplex Stainless Steel. Working and stand by pumps are provided with Inlet and Outlet valves, Check valves, and required instruments.

Salt Feeders

The Salt Feeders are provided to carry salt to the Brine Tank. The design and type of the feeder will be customized to the type of salt used. Salt comes in small 50 kg bags, or in 1-ton jumbo bags or loosely supplied in a dumper truck. The Feeder can be Electric Screw conveyer, Pneumatic Conveyor, or EOT Crane.

Hypochlorite Generators

The main equipment of the system is the Sodium Hypochlorite Generator, otherwise known as the Electrolyzer. The generators will be used to produce the hypochlorite solution and will be installed indoors. These can be of Horizontal type or Vertical type depending on the space available, capacity, and configuration. Most of the time two or three Electrolyzer cells are connected together to achieve the desired capacity. The hydraulic connections are either parallel or in series.

Transformer/Rectifiers

The transformer rectifier controlled power supply will be self-cooling. These can either be Air-cooled or Seawater cooled or Oil cooled and fitted with rectifiers of either Thyristors or Diodes. The output of the hypochlorite from each generator is directly proportional to the D. C. output of the power supply. The Transformer/Rectifiers are provided with control panels for local and/or remote control and monitoring.

Acid Cleaning Unit

The acid Cleaning system is provided with an Acid tank that will hold diluted Hydrochloric Acid. HCl dosing pump will pump the diluted acid through the Electrolyzer to remove the deposit of Calcium and Magnesium salts. The tank is designed to hold enough acid for one complete operation.

Hypochlorite Degassing cum Storage Tanks

The hypochlorite solution flows to the sodium hypochlorite degassing cum storage tank. The tanks are made of fiberglass. The storage capacity shall be sufficient to cover the shock dosing requirements. The necessary level switches are provided, for high-level alarm, level switch for switching on/off the hypochlorite generator, low-level switch which will, in case of being triggered, interrupt the continuous hypochlorite injection and will stop the shock dosing pumps.

Two sets of (100%) fresh air blowers are installed next to the tank to blow air into the tank to blow out the entrapped Hydrogen. The auto switchover of the Blower occurs in the event of the operating blower tripping. Open Top Tanks do not need Blowers.

Dosing System for Continuous Chlorination and Shock Chlorination

Normally two continuous dosing pumps are provided, for continuous flow of hypochlorite solution to the dosing point. Most of the time a set of Shock Dosing pumps are provided to meet the demand of biofouling control. While the continuous pumps dose hypo solution at a lower rate, the shock dosing pumps dose a higher rate of the solution but for a shorter time.

Instrumentation and Control

Pressure Gauges, Pressure Switches, Flow Meter, Temperature Controller, Level Switches, Level Controllers, Hydrogen Detectors, etc., are provided in the system to monitor the operation of the chlorine production. The output from all the instruments are connected to a Control Panel to properly control and monitor the operation. These Control Panels are either Relay based or PLC based. PLC based system has an interface with the plant DCS through SCADA.

Piping and Valves

Normally PVC or CPVC pipes are used in Sodium Hypochlorite Generation Systems, with PVC or CPVC Valves and fittings. These items are not only resistant to corrosion but easy to fabricate and erect.