Seawater FGD (SWFGD)

TSK "Seawater Flue Gas Desulfurization (SWFGD)" process provides many advantages for treatment of flue gas containing SO₂ from coal-fired power plants, in particular. Our Seawater FGD system has been used in Taiwan, China, Thailand, Mexico and Japan, and has been enjoying good reputation since its first plant was delivered in 1978. Presently, 20 Seawater FGD units are operating and 2 units are under construction. (For enlargement, please click here)

This Seawater FGD technology was originally introduced from Fujikasui Engineering Co., Ltd. (FKK) to provide the EPC services of Seawater FGD system.

TSK Seawater FGD offers big advantages over a conventional limestone FGD system.

[Features]

1. The spent seawater in Seawater FGD is discharged into the sea after recovery of pH, COD and DO.

*Increase of sulfate in the seawater returned to sea is within variations occuring naturally in seawater.

2. Special perforated plates (MORETANA^® plate) are installed in the absorber. The plates are specially designed for fast gas velocity with low pressure loss, realizing high treatment capacity, low initial and running cost.


3. No clogging


4. Stable operation, easy and low cost maintenance


5. Flexible load variation (Turndown ratio from 100% to 30%)

[Process Description]
The overall Seawater FGD system is extremely simple, composed of only a few pieces of equipment, leading to fewer mechanical problems, and ease in operation and maintenance.

The flue gas to be treated passes through the absorber. For the absorbent, the Seawater FGD system uses seawater, which is naturally rich in alkalinity. The Seawater FGD process is suitably applicable when a large amount of seawater is used in the power production line, etc.

The absorption of SO₂ takes place in the absorber where seawater and flue gas are brought in close contact in a countercurrent flow for effective scrubbing. Absorption of SO₂ in seawater creates bisulfate, reducing its pH by forming hydrogen ions. The following reaction explains the basic chemistry of SO₂ absorption in seawater: The effluent seawater from the absorber flows into a relay pit (or directly down stream), where effluent seawater mixes with residual fresh seawater from condenser outlet for recovering pH. Next, it flows to the seawater treatment system (SWTS) to complete the oxidation of absorbed SO₂ (as bisulfate and sulfite) into sulfate, and recovers pH and DO in seawater by aeration. The alkalinity in seawater such as carbonates and bicarbonates neutralizes hydrogen ions, which increases the pH of seawater. The following reaction is the basic chemistry representing the seawater treatment process: Sulfate completely dissolves in seawater, resulting in no waste product. Sulfate is a natural component in seawater, and typically, there is only a slight increase of sulfate in the discharged seawater. This increase is within the variations occurring naturally in seawater. For more information, the contacts are:

Address

: 2-17-15 Tsukuda, Chuo-ku, Tokyo 104-0051, Japan

Phone

: +81-3-5560-6535

Fax

: +81-3-3536-0573

e-mail

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