Quisqueya I – Wärtsilä's first Flexicycle™ plant

Sustainability assured 2011The Quisqueya I combined cycle plant, promoted also as the first Wärtsilä Flexicycle™ power plant, will be located in San Pedro de Macoris, Dominican Republic. The plant will be equipped with twelve Wärtsilä 18V50DF dual-fuel engines able to run on either natural gas or heavy fuel oil. The plant begins its electricity production in 2012.

All twelve engines are equipped with separate waste heat recovery steam generators. These ensure maximum production of superheated steam, which is used in a condensing steam turbine for secondary electricity production. The turbine has a water-cooled condenser with the water being cooled using cooling towers.

The output from steam turbines represents 7.6% of additional power, which is generated from the waste heat of the main engines. This directly improves the electrical efficiency of the power plant, while at the same time reducing CO2 emissions accordingly.

Wärtsilä engines already have very good internal efficiency. This, in combination with a properly designed combined cycle system, enables very high electrical efficiency for power production. Output from the Quisqueya I plant, including the steam turbine, will be tested and verified during the commissioning phase in 2013.

Wärtsilä will also deliver an identical power plant, Quisqueya II, which will be located at the same site. The two power plants will have a total output of 430 MW. They have separate owners, but both plants will be constructed on the same site as a single unit, that can be operated from one control room. When operational in 2013, the Quisqueya I and II power plant complex will be the biggest Wärtsilä engine driven power plant in the world.

The Wärtsilä Flexicycle™ advantages

The Wärtsilä Flexicycle™ solution combines the advantages of a flexible simple cycle plant with the superb efficiency of a combined cycle plant, in a unique way. Flexicycle™ power plants can be optimised for different outputs in the 100 to 500 MW range. The power plant solution is based on gas-fired combustion engines and a steam turbine combined cycle. Each engine is equipped with a waste heat recovery steam generator. The power plant has one common steam turbine and a condenser. The power plant cooling is typically arranged so that the combustion engines are cooled with closed-loop radiators and the steam cycle with cooling towers.

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