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Seagull Gunjang – CDS FGD

Hamon Korea successfully passed the performance test of the new G-II CDS system installed in the city of Gunsan, Republic of Korea. The contract was signed in March 2016 with Hanwha being the owner of the Co-generation power plant. 

First CDS FGD installation in Republic of Korea

The Project

This project was to build in Gunjang National Industrial Complex in the city of Gunsan in the western Republic of Korea a co-generation power plant consisting of one CFB boiler with acapacity of 450t/h of steam and one extracting condensing type turbine generator of 99 MW with the associated auxiliaries.

In order to satisfy the strict emission levels the FGD system needed to be designed to remove the SO2 and dust in all load conditions from the technical minimum load up to the BMCR.

The Challenges

Because Republic of Korea must import almost all the fossil fuels it needs, the efficiency of fossil fuel-fired power plants plays a major role in the country. At the same time, fuel gas emissions from the plant must fulfil the strict environment regulations in Republic of Korea.

The selection of the most efficient FGD system at lowest operation cost was the key for the selection of the CDS system against other technologies. Although the investment cost is slightly higher the significant lower operation cost will lead to enormous savings in the coming years.

Due to the advanced engineering co-operation between the HAMON entities, the contract was executed within 16 month after signing including erection and commissioning.

The Solutions

After the successful installation of the first CDS system in Korea by HAMON at Gunjang Energy’s unit 4 (250 MW) the CDS technology is well introduced in Korea and became the state-of-the art semi-dry FGD technology. Especially in combination with a CFB boiler, which includes a primary desulphurization in the boiler by adding limestone, the CDS system is able to operate as a polishing FGD technology utilizing the available CaO/dust from the boiler inside the FGD absorber.

Due to its unique operating principle the addition of necessary additive (lime) can be reduced below the stoichiometric ratio of 1! Therefore the CDS system is able to achieve lowest SO2 emission with less operation cost than other semi-dry technologies. Furthermore the downstream fabric filter which is an integral part of the CDS system, is able to achieve dust emissions well below 5 mg/Nm3.

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