A. Ahlstrom Corporation

Foster Wheeler Energia Oy

Teuvo Pulkkinen

Timo Hyppanen

Juhani M Isaksson

Timo Eriksson

Steven J Provol

The present invention relates to a combined cycle power plant comprising a air compressor providing pressurized air at pressure greater than 2 bar; a gas turbine means for driving the gas compressor means; a pressure vessel, circular in cross-section, connected to said air compressor and being capable of withstanding pressures greater than 2 bar; a pressurized circulating fluidized bed reactor enclosed by the pressure vessel, the circulating fluidized bed reactor having a reactor chamber, including substantially planar steam generation tube walls having a bottom section; means for leading hot combustion gases away from said reactor; one or more non-circular centrifugal separator(s) disposed within said pressure vessel being adapted to the reactor chamber and internal pressure vessel geometry for receiving and purifying hot combustion gases, having a gas outlet leading from said separator out of said pressure vessel; said centrifugal separator comprising a vertical vortex chamber having distinctly planar steam generation tube walls defining an interior gas space; and a bubbling fluidized bed heat exchanger chamber having distinctly planar steam generation tube walls defining an interior of said chamber, said chamber being connected to the bottom section of said reactor chamber; a heat recovery unit adapted to the gas turbine means for recovering heat from gas discharged therefrom; a steam generation cycle having a steam turbine, steam generation surfaces including said steam generation walls, and steam superheating surfaces.

Combined cycle power plant with circulating fluidized bed reactor

A pressurized fluidized bed reactor is provided utilizing a centrifugal separator having a gas space that is distinctly non-circular, preferably having a circularity of greater than or equal to 1.15. Most desirably the cyclone has a quadrate (e.g. square) cross-section, and is disposed inside of the pressure vessel along with the reactor chamber containing the fluidized bed. A number of ceramic candle or honeycomb filters may be provided connected to the gas outlet from the cyclone separator, within the pressure vessel, to filter the gas. This construction provides a minimized diameter of the pressure vessel because the reactor chamber with square cyclones is more compact than if conventional circular cross-section cyclones are employed. Also a second pressure vessel is not needed for the candle or honeycomb filters since there is sufficient room within the pressure vessel to accommodate them.

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Karhula, Finland

Teuvo Pulkkinen