Modelling and Simulation

Our expertise covers the development, validation and application of innovative simulation tools for developing and optimising new technologies for the energetic utilisation of a broad spectrum of biomass fuels.
We have many years of experience in CFD modelling and in the implementation of reaction kinetics and thermodynamic simulations. These modelling techniques form the basis for the step-wise and continuous development of advanced, multidimensional models, following the vision of developing the
virtual biomass conversion plant.
Model development in subarea modelling and simulation is driven by industry demand and currently deals with the following topics:

  • Thermal conversion of solid biomass
  • Ash-related problems
  • Gas phase reactions and emissions
  • Tailor-made software development

In addition to developing models, BIOENERGY 2020+ has many years of experience in applying the models to support technology developments and plant optimisation. Such work was carried out in close cooperation with the other areas in the centre and the company partners in order to ensure
a targeted performance of the simulations and the efficient and applicable implementation of their results.

SUBAREA 4.3 performance specifications

• Simulation of thermal conversion of solid biomass (combustion, gasification, pyrolysis, torrefaction)

Simulation of grate furnaces with detailed 3D CFD packed bed model; modelling the principal processes in the fuel bed, simulation of pulverised burners, optimisation of the geometry of biomass-fired boilers and furnaces, sensitivity analyses of the relevant influencing parameters on biomass combustion on the grate

• Analysis of ash-related problems

Investigation of the emissions of coarse fly ash particles (silicate and salt particles) and fine particles; simulation of deposit formation (condensation of ash-forming vapours, and fine and coarse particulate deposits); investigation of high-temperature corrosion in biomass-fired boilers

• Gas phase reactions and emissions

Simulation of gas emissions (e.g. CO and NOx) in biomass combustion systems; hybrid model for gas phase combustion (for laminar to highly turbulent flows with detailed reaction mechanisms), streak formation model for considering the effect of gas streaks raised from the fuel bed on mixing and the reaction rate; CFD models for the formation and destruction of PAH and soot; optimisation of injection system for secondary air and recirculated flue gas

• Automation of CFD simulations

Development of a tool for automatic execution of CFD-based parameter studies for optimising biomass furnaces (minimisation of volume of combustion chamber, reduction of excess air and the recirculation ratio (efficiency, operating costs), reduction of CO and NOx emissions, as well as temperature and flue gas velocity peaks)

• Tailor-made software development and training

Development of tailor-made software based on OpenFOAM and ANSYS FLUENT, as well as training at different levels