CAJ | 학술논문

基于涡耗散概念燃烧模型思想，考虑小涡上的化学反应建立亚格子反应模型。分析了流化床内煤颗粒的流动与燃烧过程。模拟了出口处气体组分，采用亚格子反应模型的模拟结果更接近实验值。对于挥发分均相反应，给出了亚格子反应速率与总反应速率随颗粒浓度的分布特性，亚格子反应速率与总反应速率分布趋势基本一致，随着浓度的增加也有上升的趋势。亚格子反应速率占总反应速率的22%左右。对于碳燃烧异相反应，给出了采用亚格子反应模型与未采用亚格子反应模型模拟的反应速率随浓度的分布特性，考虑亚格子反应模型与未考虑亚格子反应模型的模拟结果趋势一致，随着浓度的增加反而有所降低，未考虑亚格子反应模型模拟的反应速率大约为采用亚格子反应模型模拟的80%。
기우와모산개념연소모형사상，고필소와상적화학반응건립아격자반응모형。분석료류화상내매과립적류동여연소과정。모의료출구처기체조분，채용아격자반응모형적모의결과경접근실험치。대우휘발분균상반응，급출료아격자반응속솔여총반응속솔수과립농도적분포특성，아격자반응속솔여총반응속솔분포추세기본일치，수착농도적증가야유상승적추세。아격자반응속솔점총반응속솔적22%좌우。대우탄연소이상반응，급출료채용아격자반응모형여미채용아격자반응모형모의적반응속솔수농도적분포특성，고필아격자반응모형여미고필아격자반응모형적모의결과추세일치，수착농도적증가반이유소강저，미고필아격자반응모형모의적반응속솔대약위채용아격자반응모형모의적80%。
Based on the eddy dissipation concept (EDC) reaction model, the sub-grid reaction model was presented within small eddy and applied to simulate the flow and combustion behavior of coal particles in fluidized bed combustor. By comparing simulation results with sub-grid reaction model, the simulated gas components at the outlet agreed well with experiment data. For volatile homogeneous reactions, the distributions of the sub-grid and total reaction rates as a function of solid concentration were given. The distributions of sub-grid reaction rates have a similar trend with those of total reaction rates. With the increase of particle concentration, volatile homogeneous reaction rates increase. The sub-grid reaction rates are about 22%of the total reaction rates. The carbon heterogeneous reactions with and without sub-grid reaction model as a function of concentration were also given, which have a similar trend. With the decrease of particle concentration, carbon heterogeneous reaction rates increase. The results without the sub-grid reaction model are about 80%of those with the sub-grid reaction model.