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Development of High Efficiency CFB Technology to Provide Flexible Air/Oxy Operation
for Power Plant with CCS

FLEXI BURN CFB project aims to develop and demonstrate a power plant concept based on the Circulating Fluidized Bed (CFB) technology combined with Carbon Capture and Storage (CCS). The plant will be based on the super critical once through (SC OTU) technology and oxygen-firing with carbon capture, hence, providing high efficiency, operational flexibility and potential for an almost 100% reduction in CO2. The fuel flexibility of the CFB technology enables the utilization of indigenous fossil fuels with simultaneous co-firing of biomass. Thus, the technology provides potential for addressing the needs for climate change mitigation, security of supply and reduction of dependence on imported coals.


This project combines the CFB’s intrinsic advantages (fuel flexibility and low emissions) with oxygen-firing for carbon capture and storage (CCS). In oxygen-firing systems the fuel is burned in a mixture of pure O2 and recirculated flue gas instead of air. The absence of air nitrogen produces a flue gas stream with a high concentration of CO2, making it much easier to separate the CO2. CFB technology appears to be ideally suited to oxygen-firing combustion. The overall result of this project will be a power plant design based on the air/oxy flexible CFB concept, ready for demonstration of high efficiency large utility scale power plant with CCS burning a large variety of indigenous and imported coals from lignite to anthracite as well as cofiring biomass. Demonstration tests with different coals at a first of its kind 30 MWth air-oxygen-flexible CFB pilot facility and validation tests at the world’s first and largest supercritical once through CFB (460 MWe Lagisza in Poland) are essential elements in the project to ensure the efficient, reliable and safe design of the commercial scale air/oxy flexible CFB power plant.


The primary novelty of the proposed technology is in the full utilisation of all of the new CFB design and process advancements when merging a CFB boiler with a supercritical once through steam cycle and air separation unit together with CO2 capture unit for CCS. This encourages utilities to take the new technology, which has the built-in capability for CCS, into use and to decommission old, inefficient and highly polluting capacity with lower efficiency and worse emission performance. In air-firing, the higher efficiency has a direct impact on CO2 emissions due to the reduced consumption of fuel. In addition, by substituting 20% of the coal input with renewable fuels CO2 emissions can further be reduced by 15-20%. Furthermore, the air/oxy flexible CFB concept is capable of CCS whenever the CO2 storage is available. At a power plant with full CCS capability, the air/oxy flexible CFB concept serves as a risk mitigation tool that enables power generation during temporary outages of the CO2 transport and storage facilities. Such features are expected to facilitate investment decisions for highly capital-intensive CCS power plant projects.

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Additional information
Antti Tourunen
+358 20 722 2718
Events and
important dates
February 6, 2013

Workshop in Ponferrada, Spain

Introduction of FLEXI BURN CFB project with its achievements and final results.


Presentations of Workshop >>

See also
Project brochure NEW!

CFB800 brochure

Project poster NEW!

Workshop in Brussels 2011

FLEXI BURN CFB | EU FP7 | 2009 - 2012