摘要
基于欧拉双流体流模型和Gidaspow曳力模型,模拟计算得到1000MW超临界循环流化床锅炉环形炉膛气固流场。模拟采用周期性旋转对称边界条件耦合法对锅炉模型进行简化。计算结果表明：固相密度沿炉膛轴向呈近＂S＂型分布;密相区转角处存在颗粒堆积,稀相区固相截面浓度分布较为均匀,在接近炉顶时固相则更多地集中在炉膛出口附近;悬吊屏区固相浓度要略高于炉膛内部,近分离器入口的悬吊屏两侧面有较大的固相浓度差,局部最大浓度偏差可达该位置截面平均浓度的50%;同侧三分离器入口固相质量流率存在差异,中间位置固相颗粒质量流率低于两边,瞬时最大相对偏差可达7.0%-9.5%。
Numerical simulation of the gas-solid flow of a 1000MW supercritical circulating fluidized bed（CFB） octagonal furnace based on the two-phase model and Gidaspow drag model was carried out. The simulation was simplified by using rotationally symmetric periodic boundary conditions coupling method. The results indicate the following points： The axial solid concentration profile along the furnace height shows an approximate type S curve; Solid particles highly accumulate in the corner of dense phase zone while they distribute uniformly in the dilute phase zone; Solid concentration among suspended panels is slightly higher than that in the furnace; Lager solid differential concentration is found between two sides of suspended panel when it is close to furnace exit, which could be 50% of the section average value; Solid flow distribution of three cyclones is non-uniform, which in the center is smaller than that of the other two in the same side of the furnace. The maximum instantaneous deviation could be 7.0%-9.5%.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第10期2480-2486,共7页
Proceedings of the CSEE
基金
中国科学院战略先导科技专项项目(XDA07030100-6-3)~~
