TY - JOUR
TI - Computational fluid dynamics modeling of biomass co-firing in a 300 MW pulverized coal furnace
AU - Sun Jinyu
AU - Zhao Xiaojun
AU - Xue Dongfa
JN - Thermal Science
PY - 2022
VL - 26
IS - 5
SP - 4179
EP - 4191
PT - Article
AB - Biomass energy is one of the most accessible and readily available  carbon-neutral energy options as a RES. It is regarded as a viable  alternative fuel for coal combustion, particularly for biomass co-firing  with pulverized coal, with numerous applications. The CFD can provide  reasonably accurate solutions to complex thermo-chemical-fluid interactions,  which is useful for understanding the design or retrofit of boilers and can  save time, money, and effort. In this study, a CFD simulation of a 300 MW  pulverized coal boiler with biomass co-firing was performed to investigate  the impact of biomass co-firing with coal, considering the biomass co-firing  ratio, mixing effect, and feeding temperature. The results show that the  flow field in the furnace does not change significantly under different  bio-mass blending ratio. Biomass co-firing can reduce peak temperatures in  the furnace and make the temperature distribution more uniform. The  concentration of unburned carbon in the furnace decreases as the biomass  blending ratio increases. Furthermore, biomass blending has a significant  impact on nitrogen oxide reduction, with NOx emissions reduced by 20% and  28%, respectively, when the biomass blending ratio is 15% and 30%. The  change of parameters inside the furnace caused by the reduction of biomass  powder feeding temperature about 80 K is not significant. On the other hand,  co-firing biomass with coal, reduces the risk of biomass spontaneous  combustion while maintaining the furnace combustion stability and boiler  combustion efficiency. The optimum ratio of biomass co-firing ration is  deduced in this study is up to 20%.