Electro-Chlorination Plant
Electro-chlorination plant aims to prevent the deposition of marine organism such as barnacle, sea mussel and other shellfishes in the cooling water system, by directly electrolyzing seawater, without using any chemicals.
DAIKI ATAKA has constructed more than 220 of our electro-chlorination
plants (DAIKI HYCHLORATOR) in all over the world for power plants, LNG
plants, desalination plants and various other plants along coastal industrial
zone.
Principal of seawater electrolysis
HYCHLORATOR is an equipment designed to produce hypoclorite through the direct electrolysis of seawater. In general, the seawater is regard as a 3% brine of approximate PH 8.
Therefore, the seawater is direct electrolyzed in the following reaction：
【Anode reaction】
2Cl - → Cl2+2e-
【Cathode reaction】
2Na+ + 2H2O + 2e- → 2NaOH + H2
【Reaction in electrolysis cell】
2NaOH + Cl2 → NaCl + NaClO + H2O
【Total reaction】
NaCl + H2O + 2F → NaClO + H2↑
Direct Injection system
Tank system
Circulation system
Components and features of Hychlorator System
1) Seawater supply unit
The seawater sent by a circulating pump, at first, gets the solids in it removed by a strainer, and is sent to an electrolyzer.
2) Electrolyzer and DC power supply
The seawater is directly electrolyzed in the electrolyzer, to produce sodium hypochlorite and hydrogen gas.
3) Dehydrogenating unit
The seawater gets the hydrogen in it removed by a dehydrogen drum for release into open air, and the remaining seawater containing sodium hypochlorite is injected into any intended place such as an intake.
Since the generation of sodium hypochlorite is proportional to the DC current supplied to the electrolyzer, it can be speedily, safety and accurately controlled by adjusting the DC current.
Type of Electrolytic cell
Model of Mono-polar type
| Model | 6L | 10L | 10WL | 15L | 15WL |
|---|---|---|---|---|---|
| Max. Capacity (kg/h) |
0.5 | 1.5 | 3 | 3.5 | 7 |
| Seawater flowrate （m3/h） |
10 | 24 | 55 | ||
| AC KVA （kVA） |
4 | 13 | 25 | 30 | 59 |
| Power consumption※1 DCkW/h |
＞4.0 | ＞4.0 | ＞4.0 | ＞4.0 | ＞4.0 |
※1 All values based on seawater temparure of 25 °C 18,000ppm chloride
Model of Bi-polar type
| Model | 15BL | 25BL | 35BL | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Tiers quantity | 6 | 8 | 10 | 6 | 8 | 10 | 6 | 8 | 10 |
| Max. Capacity (kg/h) |
10 | 13 | 16 | 28 | 37 | 46 | 54 | 72 | 90 |
| Seawater flowrate (m3/h) |
24 | 75 | 150 | ||||||
| AC KVA (kVA) |
80 | 97 | 107 | 215 | 277 | 338 | 420 | 541 | 661 |
| Power consumption ※1(DCkW/h) | ＞4.0 | ＞4.0 | ＞4.0 | ||||||
※1 All values based on seawater temparure of 25 °C 18,000ppm chloride
Chlorine generation capacity of the unit depend on the cell's Model No. and numbers.
For example
15BL6-4 (6 tiers/cell, 4 cells in the unit) can generate 10X4=40kg/h ,
25BL8-4 (8 tiers/cell, 4 cells in the unit) can generate 37X4=148kg/h
Sep, 2008
Sep, 2008
