Electrochlorination System
Introduction
Electrochlorination system is well known as the best method to prevent accumulations of marine life in the seawater intake line of the various plants, because no dangerous liquid or gaseous chlorine is required.
Since 1965, as a world-leading manufacturer, We, Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd. (hereinafter called as “MHIEC“) have delivered more than 150 plants of electrochlorination system called as MGPS all over the world.
“MGPS“ means Mitsubishi Marine Growth Preventing System.
- MGPS for LNG Terminal
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- Location: Japan
- Chlorine capacity: 37 kg/h
(=37 kg/h/cell x 1cell x 1unit)
- MGPS for LNG Terminal
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- Location: South East Asia
- Chlorine capacity: 100 kg/h
(=50 kg/h/cell x 2cells x 1unit)
- MGPS for Power Plant
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- Location: Japan
- Chlorine capacity: 410 kg/h
(=51.25 kg/h/cell x 2cell x 4units)
Applications
Our MGPS can be applied to the various plants listed below.
- Power plant
- Desalination plant
- Chemical plant
- LNG / LPG terminal
- Nuclear power plant
- Refinery
- Fertilizer plant
- Iron and steel manufacturing plant
- Offshore platform
- FPSO (Floating Production, Storage and Offloading system)
- Other industrial plant using seawater
Technologies
- Principle of System
- Bi-polar Cell
- Once-Through System
- MITSUBISHI Recycle System
- Advantages of MITSUBISHI Recycle System
Principle of System
Seawater normally contains chlorine ion (Cl-) at a concentration of from 15,000 to 20,000ppm. By electrolysis of seawater, the following reactions occur:
At anode: 2Cl- →Cl2 + 2e
At cathode: 2H2O + 2e →2OH- + H2
2Na+ + 2OH- →2NaOH
Free chlorine (Cl2) generated at the anode reacts with caustic soda (NaOH) generated at the cathode and forms sodium hypochlorite solution (NaClO).
Cl2 + 2NaOH → NaClO + NaCl + H2O
Injection of sodium hypochlorite solution is very effective to avoid accumulation of marine life like shellfish and seaweed etc.
Bi-polar Cell
Bi-polar cell unit was developed in 1982 and are now our standard design.
The electrode plate in the Bi-polar cell unit has two parts. The lower half part of plate coated with platinum metals working as anode and the upper half part with titanium surface (no coating) working as cathode. The electrodes are positioned every other plate by only half plate.
Comparing with Mono-polar cell (former type cell), this Bi-polar cell can achieve;
- Less Installation Space
- Easier Maintenance (because all electrode plates are assembled and can be replaced one time)
- Higher Efficiency
Once-Through System
Once-Through System is most popular system in the world.
We have supplied Once-Through System since 1962.
MITSUBISHI Recycle System
MITSUBISHI Recycle System is our particular technologies which was developed in 1982.
As shown in the typical system flow of MITSUBISHI Recycle System, sodium hypochlorite solution produced in the Bi-polar cell unit is transported to the cell unit again with seawater, while some portion of it is discharged into the seawater inlet channel.
Advantages of MITSUBISHI Recycle System
MITSUBISHI Recycle System is scale adhesion free system because its Seeds Effect.
Therefore, comparing to Once-Through System, MITSUBISHI Recycle system can reduce a frequency of acid cleaning work dramatically from once per month (12 times per year) into once per year (1time per year).
As the result MITSUBISHI Recycle System can achieve
- Stable operation without scale adhesion problem
- Easier maintenance and lower maintenance cost with less acid cleaning frequency
- Minimum environmental load with less acid waste
Delivery Records
Since 1965, as a world leading manufacturer of Electrochlorination system, we have delivered more than 150 plants of MGPS all over the world, especially for Asia, Middle East and Latin America.
Our MGPS have been installed in various plants , and have fulfilled an important roll for stable and continuous plant operation.
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