CFD analysis of the effects of co-firing biomass with coal

Chaouki Ghenai, Isam Janajreh

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

Abstract

Computational Fluid Dynamics (CFD) analysis of the effects of co-firing biomass with coal is presented in this study. Coal/biomass co-firing is a complex problem that involves gas and particle phases, along with the effect of the turbulence on the chemical reactions. The CFD analysis includes the prediction of volatile evolution and char burnout from the co-pulverized coal/biomass particles along with the simulation of the combustion chemistry occurring in the gas phase. The mathematical models consist of models for turbulent flow (RNG k-ε model); gas phase combustion (two-mixture fractions/PDF model); particles dispersion by turbulent flow (stochastic tracking model); coal/biomass particles devolatilization (two competing rates Kobayashi model); heterogeneous char reaction (kinetics/diffusion-limited rate model); and radiation (P-1 radiation model). The coal used is a Canadian high sulfur bituminous coal. The coal was blended with 5-20% wheat straw (thermal basis) for co-firing. The effect of the percentage of biomass blended with coal on the flow field, gas and particle temperature distribution, particles trajectories and gas emissions (CO2 and NOx) are presented. One important result is the reduction of NOx and CO2 emissions when using co-combustion. This reduction depends on the proportion of biomass (wheat straw) blended with coal.

Original languageBritish English
Pages (from-to)1694-1701
Number of pages8
JournalEnergy Conversion and Management
Volume51
Issue number8
DOIs
StatePublished - Aug 2010

Keywords

  • Biomass
  • CFD
  • Co-combustion
  • Coal
  • Discrete phase modeling
  • Mixture fraction/PDF model

Fingerprint

Dive into the research topics of 'CFD analysis of the effects of co-firing biomass with coal'. Together they form a unique fingerprint.

Cite this