Sodium Hypochlorite Generator
The attachment and growth of marine organisms in seawater pipelines and cooling equipment will cause the flow of seawater to be blocked, the heat exchange efficiency to drop, and the formation of biological corrosion. The electrolytic seawater sodium hypochlorite generator is applied to the seawater system of the coastal power station, which can effectively prevent the attachment and growth of marine organisms.
Product Introduction
A Sodium Hypochlorite Generator (also known as a NaClO electrolysis generator) is an efficient and environmentally friendly system designed to produce sodium hypochlorite solution on-site.
It operates by electrolyzing a salt (NaCl) solution to generate sodium hypochlorite, which is widely used as a disinfectant in:
Water treatment
Food processing
Healthcare
Industrial sanitation
Compared with traditional chlorine gas or liquid bleach, this system is:
Safer to handle and store
Environmentally friendly
Lower risk in operation
More stable in output
Working Principle
Electrochemical Reactions
Anode reaction:
Cathode reaction:
Chemical reactions in solution:
Overall reaction:
Process Characteristics
The equilibrium between Cl₂, ClO⁻, and HClO depends on:
pH value
Temperature
In seawater conditions:
~80% NaClO
~20% HClO
pH: 8.0–8.5
At ~15°C:
Long-term operation leads to:
Calcium (Ca²⁺) and magnesium (Mg²⁺) scaling on the cathode
Requires periodic acid cleaning (pickling)
Main Components of Electrolyzer
1. Electrolyzer Cover
Material: Transparent acrylic (plexiglass)
Function: Visual monitoring of electrolysis process
2. Electrolyzer Shell
Material: PVC
Features:
Strong corrosion resistance
Leak-proof design
Stable structure
3. Anode
Type: DSA (Dimensionally Stable Anode)
Material: Titanium substrate with MMO coating
Features:
Turbulence
Active surface area
Chlorine generation efficiency
Excellent electrochemical performance (0–45°C)
Long service life
Mesh structure increases:
Electrode spacing: ~2.5 mm (using PVDF spacers)
4. Cathode
Standard: Titanium
Optional: Hastelloy alloy
Advantages of Hastelloy:
Better corrosion resistance
Lower hydrogen evolution potential (~0.45V lower)
Reduced scaling and hydrogen embrittlement
5. Sealing System
Conductive sealing: Fluororubber O-rings
Shell sealing: Silicone rubber O-rings
6. Structural Metal Parts
Internal: Titanium
External: Stainless steel 316
Installation: Torque-controlled fastening
7. Electrical Conductivity System
Titanium-clad copper conductor:
Titanium (inside cell)
Copper (outside cell)
Ensures:
High conductivity
Corrosion resistance
Key Advantages
On-site generation (no chemical storage)
High safety compared to chlorine gas
Low operating cost
Stable disinfectant concentration
Reduced environmental impact
Easy operation and maintenance
Operational Considerations
Temperature Effect
Below 18°C:
Reduce operating current
Below 10°C:
Stop operation
Reason:
Increased seawater viscosity → reduced electrolysis efficiency
Risk of electrode fouling
Scaling Control
Ca²⁺ and Mg²⁺ deposits form over time
Regular acid cleaning required
Salinity
No strict upper limit
Higher salinity → higher efficiency
Typical Applications
Seawater electrochlorination
Drinking water disinfection
Industrial circulating water systems
Cooling water systems
Wastewater treatment
Marine antifouling systems
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