Tlakové fluidní spalování -PFBC

Evolution of the coal-fired power plant

Schematic of circulating PFBC system.

Oběh s tlakovým fluidním spalováním

.Circulating Fluidized Bed Cycle boilers

•Several hundred large CFBC boilers worldwide

•Jacksonville 300 MWe CFBC –coal, etc.- largest units

•Provence, France 250MWe lignite (high Ca)

•Two 250 MWe CFBC boilers in Korea (Anthracite)

Bubbling PFBC

• Standard type is a bubbling PFBC in a pressure vessel–

• Operating pressure (1 to 1,5 MPa)

• Coal fired with dolomite addition

• Operating temperature (800- 900ºC)

• •Heat transfer controlled by in-bed heat exchangers (load following by changing bed height)

• Deep beds (3-4 m )

PFBC Operational Units

• Cottbus, Germany (71 MWe)

• Vartan, Sweden (Two units, total 135 MWe)

• Karita, Japan (360 MWe)

• New Plants? Possibly a large plant in China

Sulphur Capture

•In atmospheric FBC

CaCO3= CaO + CO2

Produces a porous particle (50%), which gradually fills up with CaSO4, limiting overall conversion to about 30-40%

•In pressurized FBC

CaCO3+ ½ O2+ SO2= CaSO4+ CO2

P200 Stockholm

.Teplárna

Escatron • .

Advanced Pressurized Fluidized-Bed Cycle A-PFBC

Advanced Pressurized Fluidized Bed Combustion

Technology (A-PFBC)

A-PFBC

The development of coal utilization high efficiency powergeneration technology is an urgent issue from the viewpoints of reduction in greenhouse gases and of resource saving.

Technology A-PFBC is a further advanced technology of PFBC (pressurized fluidized bed combustion).

That is, the development aimed to increase the temperature at inlet of gas turbine, (from about 850oC to about 1,350o C), and to recover high temperature steam. To attain higher efficiency of power generation (about 46% of net efficiency; about 40% for the current coal fired power plants) by the combination of PFBC with the fluidized bed gasification technology.

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