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Application of the Numerical Techniques for Modelling Fluidization Process Within Industrial Scale Boilers.

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Numerical simulations of industrial circulating fluidized bed (CFB) boilers compare air and oxy-fuel combustion. The study validates models against experimental data, showing comparable temperature and pressure trends for both combustion types.

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Area of Science:

  • Energy Engineering
  • Chemical Engineering
  • Combustion Science

Background:

  • Industrial circulating fluidized bed (CFB) boilers are crucial for power generation.
  • Understanding combustion processes under air and oxy-fuel conditions is vital for efficiency and emissions reduction.
  • Accurate numerical modeling is essential for optimizing CFB boiler performance.

Purpose of the Study:

  • To present numerical simulations of large-scale industrial CFB boilers under air- and oxy-fuel combustion.
  • To validate a 3D numerical model using experimental data from a 2D rig and industrial boilers.
  • To investigate the impact of radiative heat transfer and a novel radiative properties model for oxy-fuel combustion.

Main Methods:

  • Utilized a 3D numerical model for dense particulate transport and combustion simulation in industrial CFB boilers.
  • Employed a hybrid Euler-Lagrange approach to model the fluidization process.
  • Incorporated a novel model for retrieving radiative properties of gases under oxy-fuel combustion.
  • Validated the model by comparing simulated temperature and pressure profiles with experimental data from air-fuel operation.

Main Results:

  • The numerical model successfully simulated dense particulate transport and combustion simultaneously.
  • Radiative heat transfer was investigated, and its impact on temperature profiles was analyzed.
  • The model showed comparable trends in temperature and pressure profiles for both air and oxy-fuel combustion when compared to measured data.
  • Model stability and sensitivity to oxidizer composition changes were evaluated.

Conclusions:

  • The developed 3D numerical model is capable of simulating industrial CFB boilers under both air and oxy-fuel combustion conditions.
  • The model provides valuable insights into the behavior of CFB boilers during combustion transitions.
  • The study confirms the applicability of the hybrid Euler-Lagrange approach and the novel radiative properties model for oxy-fuel combustion simulations.