A Combined System of Fuel Washing Involving Both Centrifuges and Electrostatic Separators: A Hybrid
In the gas turbine business, heavy fuels have traditionally been treated by plants using either centrifuges or electrostatic precipitators as water/fuel separators. These systems individually have certain disadvantages when applied to treating difficult heavy fuels, which can be overcome by combining the two systems whereby in the first-stage centrifuges are used followed by electrostatic precipitators in the second and subsequent stages of the treatment. The first part of the paper will deal with the Hybrid system itself, outlining its advantages, to be followed by a second part which will provide a description of the world’s first Hybrid plant which will have been built for Qatar. This plant has two stages, the first with seven centrifuges and the second with an electrostatic precipitator. Extraction of the salt in the oil to the wash water is brought about in both stages by a multi-stage rotary paddle type extractor which will also be described.