Electro Chemical Production Rectifiers and Power Converters for Chlor Alkali
1. Process Introduction of chlor-alkali electrolysis
Sodium hydroxide (NaOH), also known as caustic soda is a widely used chemical produced by electrolysis of an aqueous NaCl salt solution (brine). The resulting product is caustic soda lye or liquor, a NaOH solution in demineralised water.
As an industrial commodity, caustic soda holds a pivotal position in the manufacture of a wide range of industrial and consumer products.
Thanks to its strong alkaline nature, caustic soda has an outstanding ability to dissolve or extract, making it the product of choice for applications in the pulp and paper industry, for alumina extraction from bauxite ore and for use in demanding cleaning applications, such as breweries, bakeries and other food processing environments.
In water treatment, it is a powerful means for pH adjustment, neutralizing water streams and contributing to reducing corrosion.
In sodium-based chemistry, it serves as a reactive agent in the production process, delivering sodium to the final product in various ways and for many different purposes. Caustic soda is for example used in the production of silicas, silicates and metasilicates, phosphates, fibres, bleach, detergents and soaps as well as in food processing (for example of sugar) and in the refining of vegetable and mineral oils.
The caustic soda is gotten through the electrochemical reaction according to the formula
causes Cl- ions to be oxidized to chlorine at the anode, while water is reduced to hydrogen and OH- ions at the cathode. To bring this about, specially prepared pure brine is fed into the anode compartment. A cation-selective membrane separates the cathode compartment from the anode compartment. Only hydrated sodium ions can pass through the membrane. With the aid of the electric field, chloride ions are blocked out very well. As a result, the OH- ions combine with Na+ ions in the cathode compartment to form pure caustic soda.
2. Rectifiers and Power Converters Role in Caustic Soda Production
Rectifier system provides continuous DC power for Ion-exchange membrane electrolyzer, the rectifier plays important role for reliable, stable and efficient running. Efficiency, reliability, easy-to-operation, protection behavior are related performance.
3. Green Power Experience in Rectifier and Power Converters in Caustic Soda Production
Green Power is dated back to 1960, from the earliest rectifier manufacturer in China.
Have provided hundreds of high power Rectifiers for Chlor Alkali industry.
Have own PhD and master degree technical team, 100% self owned technology, DSP digital controller
Products exported to more than 40 countries, rich foreign country engineering experience, English communication without any problem
Strict quality control processs, strictly follow ISO 9001 quality management
Efficient and professional after sale service
4. Rectifiers and Power Converters for Chlor Alkali Block Diagram
The Rectifiers and Power Converters system normally includes high voltage switchgear, rectifier transformers, Rectifier, control panel, heat exchanger, high current DC current measurement sensor, polarization rectifier, DC disconnector, connection copper busbars, computer monitoring unit. Harmonic filter and power factor compensation facility is optional.
5. Rectifiers and Power Converters Reference Project Picture
6. Main Technical Parameters of Rectifier for Caustic Soda
Input voltage | AC 3 phase kV level, 50Hz/60Hz |
Rated output DC voltage | up to DC 800V |
Rated output DC current | up to DC 20kA |
Design Standard | IEC-60146 Semiconductors converters IEC-60076 Power transformers IEC-61378 Converters transformers |
Power factor at input @rated load | Not less than 0.9 through on load tap changer without power factor improving capacitor banks, above 0.97 after compensation |
Efficiency @ rated load | ≥98%(typically) |
Stability of output current at set point | Within ±0.5% |
Type of control | Digital control |
Ingress protection class of rectifier panel | IP54 |
Ambient temperature for design purpose | Max. 50℃ |
Rectifier pulse | Thyristor based 12 or 24 pulse |
Type and mode of control | Constant current |
Duties/overload | 150% for 1 minutes, 110% for 5 minutes, 100% long term |
Rectifier thyristor cooling | Forced water cooled(cooling water is deionized water) |
Transformer cooling method | OFWF or OFAF of ONAN based on output power |
Transformer installation place | Indoor or Outdoor |
HMI | Color touch panel Siemens brand |
Remote control interface | 4-20mA signal and dry contacts/Modbus/Profibus/ Profinet |
Thyristor N+1 redundancy | Yes |
Heat exchanger | Deionized water/raw water exchange, with redudancy |
Protections | Grounding detection and grounding fault alarm Thyristor RC snubber Fast action fuses Over heat Output over voltage Output over current Water pressure Water temperature Others required by purchaser |
7. Company Introduction Video
Contact us:
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alice@bjgreenpower.com
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