TY - JOUR
TI - Influence of application of Hottel’s zonal model and six-flux model of thermal radiation on numerical simulations results of pulverized coal fired furnace
AU - Crnomarković Nenad Đ
AU - Sijerčić Miroslav
AU - Belošević Srđan V
AU - Tucaković Dragan R
AU - Živanović Titoslav
JN - Thermal Science
PY - 2012
VL - 16
IS - 1
SP - 271
EP - 282
PT - Article
AB - Difference of results of numerical simulation of pulverized coal fired  furnace when mathematical models contain various radiation models has been  described in paper. Two sets of numerical simulations of pulverized coal  fired furnace of 210 MWe power boiler have been performed. One numerical  simulation has contained Hottel’s zonal model, whereas the other numerical  simulation has contained six-flux model. Other details of numerical  simulations have been identical. The influence of radiation models has been  examined through comparison of selected variables (gas-phase temperature,  oxygen concentration, and absorbed radiative heat rate of surface zones of  rear and right furnace walls), selected global parameters of furnace  operation (total absorbed heat rate by all furnace walls and furnace exit  gas-phase temperature). Computation time has been compared as well. Spatially  distributed variables have been compared through maximal local differences  and mean differences. Maximal local difference of gas-phase temperature has  been 8.44%. Maximal local difference of absorbed radiative heat rate of the  surface zones has been almost 80.0%. Difference of global parameters of  furnace operation has been expressed in percents of value obtained by  mathematical model containing Hottel’s zonal model and has not been bigger  than 7.0%. Computation time for calculation of 1000 iterations has been  approximately the same. Comparison with other radiation models is necessary  for assessment of differences.