Thyristor And IGBT Rectifier For Electrolysis Of Sea Water For The Production Of Sodium Hypochlorite

Thyristor Rectifier for electrolysis of sea water for the production of sodium hypochlorite Electrolysis Process The processes involved in electrochlorination are actually rather simple. The main idea involved is the electrolysis of water to produce a chlorinated solution. This happens when...

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Thyristor Rectifier for electrolysis of sea water for the production of sodium hypochlorite

Electrolysis Process

The processes involved in electrochlorination are actually rather simple. The main idea involved is the electrolysis of water to produce a chlorinated solution. This happens when saltwater is inserted into electrolyzer cells. The first step is removing the solid excess from the saltwater. Next, as the saltwater runs it is streamed through a channel of decreasing thickness. One side of the channel is a cathode, the other is an anode. As the water flows through the anode/cathode channel, a low voltage DC current's applied. When this happens, the electrolysis is triggered and sodium hypochlorite is instantly produced as well as hydrogen gas (H2). The hydrogen rich sodium hypochlorite then travels to a tank that removes the hydrogen gas. The dehydrogenization mechanism varies from device to device but the process is generally the same. After hydrogen has been removed from the solution, it is stored in a tank as the finished product. No chemicals other than ordinary salt, or sodium chloride (NaCl), are used throughout the entirety of the process. Although the actual chemical processes involved are complex, they can be simply represented by the following equation:

                                         NaCl + H2O + ENERGY → NaOCl + H2

In words this reads: energy is added to sodium chloride (table salt) in water, resulting in sodium hypochlorite and hydrogen gas.


On occasion, companies will want to use seawater for this process due to its extreme low obtaining cost. The seawater used is usually brackish water or brine (i.e. a solution with >0.5% salinity). In these cases, random chemicals may be introduced into the system. These random chemicals pose no threat to the system however, due to the simplicity of the process. The low voltage DC current that is applied will do only what it is intended to do, i.e. electrochlorination. The excess random chemicals are left untouched and can be easily discarded.


The product of this process, sodium hypochlorite, contains 0.7% to 1% chlorine. Anything below the concentration of 1% chlorine is considered a non-hazardous chemical although still a very effective disinfectant. In addition, the sodium hypochlorite produced is in the pH range of 6-7.5. This means that the chemical is relatively neutral in regards to acidity or baseness. Also, at that pH range, the sodium hypochlorite is extremely stable and the electrochlorination extremely effective.

Rectifier in Electrolysis Process

DC Rectifier plays very important role in the electrolysis process, it provides reliable and stable DC current which make the process happens. 

production of sodium hypochlorite

Rectifier Solutions for production of sodium hypochlorite

Based on customer requirement and needed power of the electrolysis process, Green Power could provide IGBT Rectifier and Thyristor Rectifier solutions to provide the optimized performance and highest performance price ratio. 

IGBT rectifier for electrolysis Rectifier for electrolysis of sea water for production of sodium hypochlorite

         IGBT Rectifier for Electrolysis                   Thyristor Rectifier for Electrolysis

IGBT Rectifier Main Parameters


IGBT  High Frequency Switch Mode Rectifier


IGBT high frequency rectifier, Modular structure

Working duty                 

100% 24 hours continuous running 

Input voltage                         

380/415V/480V AC ±10% 3 phase 4 line, 50-60Hz

Rated output voltage

DC 6V-300V

Rated output current

DC 100A-30000A

Output range


Control Accuracy


Power factor



typical 90% at rated output

Current ripple

≤10% to ≤1% of rated output 

current at constant current mode, low ripple in whole range

Control mode

constant current/constant voltage


Air cooling or water cooling

Protection class

IP32 for Air cooling,IP44 for Water cooling

Insulation grade



Touch Panel on control box

Remote control interface

Standard RS485, Profibus, Profinet, 0-10V/4-20mA available

Alarm type

Audible and visual alarm


Output overcurrent protection 

Over heat protection

IGBT Driving protection


Digital DSP control(USA TI DSP Chip)

History date record function

Waveform function

History protection record function


Anticorrosion treatment

Ambient temp

Max. 40℃, derated operation up to 50℃


≤2000m altitude. De-rated operation if higher

Thyristor Rectifier Main Parameters


Thyristor  Rectifier

Input voltage                         

AC 3 phase 220V/380V/415V/480V ±10%, 50Hz/60Hz, Or KV high voltage

Rated output voltage

Custom design, up to 1000V

Rated output current

Custom design, up to 100kA

Output DC current range

DC 0-100%

Transformer cooling method

Dry type or oil cooling

Insulation grade 

B, A

Transformer installation place

Indoor, inside or outside of power supply cabinet

Transformer Silicon steel sheets 

adopt top quality cold rolled grain oriented silicon steel sheet with 

high permeability and low loss

Tap changer


Circuit configuration

3 phase bridge or double star

Output pulse

6 pulse or 12 pulse

Efficiency including transformer 

and power supply

Higher than 90% 

Power factor

Higher than 0.9 at rated output

Constant current accuracy

Within +/- 0.5%

Constant voltage accuracy

Within +/- 0.5%

Control mode

Constant current, constant voltage 

Current Ripple


Harmonics TDHi

Custom design

Thyristor rectifier cooling method

Water cooled or forced air cooling


Color touch panel

Remote control interface

RS485, Profibus, Profinet


Grounding detection and grounding fault alarm

Thyristor RC snubber

Fast action fuses and etc.

Over heat

Output over voltage

Output over current and etc.


Green Power Company Advantages


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Wechat: 65044167

Looking for thyristor and igbt rectifier for electrolysis of sea water for the production of sodium hypochlorite? Green Power Technology is one of the professional manufacturers and suppliers. We have been dedicated to this field for over 20 years and already exported products to India, USA, Germany, etc. Equipped with a productive factory, we warmly welcome you to buy our high quality products made in China at competitive price or try our customized service.