How it works
sodium hypochlorite generator
The main reaction process of sodium hypochlorite generator electrolysis seawater can be expressed by the following equation:
NaCl+ H2O = NaClO + H2↑
Electrode reaction:
Anode: 2Cl–2e- → Cl2
Cathode: 2H2O + 2e- → H2 + OH-
Solution reaction: 2NaOH + Cl2 → NaCl + NaClO + H2O
The electrolysis process of the electrolytic seawater type sodium hypochlorite generator is an electrochemical reaction process, which uses seawater and electricity as raw materials to make sodium hypochlorite solution. Although the chemical principle is simple, there are many technical indicators that can affect the outcome of reaction. Therefore, the design of the electrolysis electrode of the sodium hypochlorite generator should consider various factors, according to the compact and reasonable structure, energy-saving operation, convenient operation and maintenance, high operational reliability, and long equipment life. And other characteristics to design and manufacture. The sodium hypochlorite solution is accurately dosed, safe to operate, easy to use and store, non-toxic to the environment, and there is no air leakage, and it can be dosed under any environmental working conditions.
System composition:
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Seawater booster pump set
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The seawater booster pump set provides the power source for the seawater filter and the back-end process to overcome the pressure drop. |
| Sea water filtration system |
Filter seawater to micron level to prevent large particles from entering the electrolytic cell group and affecting the electrolysis process.
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Electrolyzer group
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The electrolytic cell group is the core unit of the whole set of equipment. The electrolytic cell group adopts titanium-based ruthenium and iridium rare metal oxide coating. The seawater passes through the electrolytic cell group through direct current catalysis to convert seawater’s sodium chloride into sodium hypochlorite and hydrogen. |
| Rectifier transformer |
Usually a rectifier transformer in the form of a silicon controlled rectifier is used, the voltage is changed to the required voltage through the transformer, and then a thyristor is used for controlled rectification. The input AC power is converted into DC power and the positive and negative poles provide power source and output to the electrolytic cell.
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Storage and dehydrogenation tank
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The generated sodium hypochlorite solution and hydrogen enter the storage and dehydrogenation tank through the pipeline for temporary storage and dehydrogenation process. |
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Dehydrogenation fan unit
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The wind unit generally adopts the 1D+1S form, which blows a large amount of air into the storage and dehydrogenation storage tank to dilute the produced hydrogen and provides a power source to discharge the diluted hydrogen to a safe discharge point.
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Dosing pump set
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Use corrosion-resistant centrifugal pump to output to the dosing point.
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Pickling system
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The raw material is diluted with 31% hydrochloric acid and used for acid washing of the temporary storage power supply solution tank group to remove the scale of the electrolytic tank group.
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Control System
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The central control system of the complete set of equipment is used to control the automatic start and stop of the complete set of equipment and coordinated control with the outside.
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Power distribution system
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Allocate power sources for motors and related electrical drive equipment. |
| Optional accessories |
The default standard configuration of PPE electrolyzer 1. Mesh type electrolyzer (MESH) 2. Concentric circular tube electrolyzer (CTE) |
Application areas:
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Electricity
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Sea water lifts structures and kills marine life
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Circulating water treatment
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| Industry |
Petroleum and chemical circulating water treatment
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Technical Parameters
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Index
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Unit |
National standard(A) |
Standard |
| Power Efficiency |
% |
≥75 |
≥92
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DC power consumption
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kW.H / Kg.Cl2 |
≤4.5 |
≤3.4 |
| Chlorine evolution potential |
V (S.C.E) |
≤1.13 |
≤1.04
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Anode enhanced life test
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Hr. |
≥30 |
≥100 |
| Cathode service life |
Y |
≥20 |
Never damaged
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Pickling cycle
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D |
30 |
≥36 |
| Site layout size |
Consult local business personnel
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Flow Chart
Design standards
Basic reference design standards for coastal power stations:
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GBT 22839-2010
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Technical conditions of electrolytic seawater sodium hypochlorite generator |
| JB/T 2932-1999 |
Technical conditions of water treatment equipment
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GBT 50050-2017
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Design code for industrial circulating cooling water treatment |
| DL 5068-2014 |
Technical Regulations for Chemical Design of Thermal Power Plants
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DL 5054-1996
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Technical Regulations for the Design of Steam and Water Pipelines in Thermal Power Plants |
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GB 6450-86
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Dry-type power transformer
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| GB 3859-93 |
Semiconductor power transformer
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GB 3956-97
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Copper and aluminum conductive cores of wires and cables for power installations
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GBJ 87-1985
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Design code for noise control of industrial enterprises
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HG/T 20538-2016
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Plastic lining (PP, PE, PVC) steel pipes and pipe fittings
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