DFG SFB Transregio 129: Oxyflame

  Coal fire WSA Development of Models and Methods to describe Solid Fuel Combustion in an Oxy Fuel Atmosphere

The safe energy and electrical power supply in future affords a mixture of regenerative, nuclear and additional fossil fuels like coal, oil and natural gas. Although the reduction of climate gases is of top priority worldwide, conventional power plant technology based on air-blown combustion of fossil fuels causes emissions of climate gases. This conflict of aims can be solved by Carbon Capture and Storage (CCS)-technologies. Oxy-fuel combustion is one of the most promising CCS-Technologies to separate CO2. In this process, fuel is burned with a mixture of oxygen and recirculated flue gas instead of air. This leads to a CO2 rich flue gas and enables an efficient CO2 separation.

The replacement of the air contained nitrogen by CO2 und H2O leads to an entirely different combustion process. This may result in instabilities and local dilutions of the flame. Therefore a clear understanding and the correct description of this combustion behavior affords physical and chemical models for this special atmosphere.

This will result in the following technical expertise, basic data and models developed within this collaborative research center:

  • Reliable models based on fundamental knowledge of involved processes and their dependence on parameters and boundary conditions starting from micro scale to scale-interacting phenomena,
  • Basic data to predict the heat transfer from the flame to the furnace walls and components within a furnace containing an oxy-fuel atmosphere,
  • A validated and reliable knowledge base to develop and design burners and furnace chambers of power plants for oxy-fuel combustion.

In the collaborative research center Oxyflame scientist from RWTH Aachen, Ruhr University Bochum, and Technical University of Darmstadt develop chemical and physical models to fundamentally describe combustion and heat transfer in oxy-fuel combustion processes. These models are based on basic data and technical expertise from experimental investigations within this research center.

The models will provide a knowledge base for engineering tools to enable predictive engineering of burners and boilers especially for solid fuel combustion in an oxy-fuel atmosphere. This reduces the period for power plant development by achieving bigger scale-up steps and a reduced number of experimental investigations.

 
 

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