循环流化床锅炉内稀相区颗粒流动特性的数值研究  

Simulation of Particles Flow Behavior in Dilute Phase Region of a Circulating Fluidized Bed Boiler

作　　者：金有海[1] 姬广勤[1] 谭慧敏[1] 王建军[1] 李东芳[1] 

机构地区：[1]中国石油大学(华东)机电工程学院,山东东营257061

出　　处：《过程工程学报》2009年第S2期146-151,共6页The Chinese Journal of Process Engineering

摘　　要：结合水煤浆流化-悬浮燃烧过程的特点,通过运用欧拉双流体模型,对循环流化床锅炉内气固两相流场进行了数值模拟.结果表明,稀相区内存在固体颗粒浓度中心区域低、近壁区域高的环核结构,固体颗粒在横截面上存在由核心区向环形区的内循环运动;稀相区床层压降与颗粒浓度近似呈线性关系.作为脱硫剂的石灰石宜选用平均粒径为100~160μm的颗粒,可以强化脱硫效果;作为床料的石英砂宜选用平均粒径大于245μm的颗粒,可以降低其在稀相区的浓度,减少对炉膛壁的磨损.According to the characteristics of fluidized suspension combustion of coal water mixture in a circulating fluidized bed boiler,a multifluid Eulerian model incorporating the kinetic theory for solid particles was applied in order to simulate the particles flow behavior in the CFBB.The results showed that the flow pattern in the dilute phase section of a CFB consists of a core-annular flow regime in which the solid density near the wall region was higher than that at the center of the riser.The solid velocity was high at the center of the riser and solid down-flow at the wall regions,the particles moved from the center to the annular zone in the same section.There existed nearly linear relationship between solid density and pressure drop.It can improve the effect of desulfurization by choosing limestone with mean size of 100~160 μm,while choosing sand with mean size bigger than 245 μm can decrease the abrasion.

关 键 词：能源与动力工程 水煤浆 循环流化床 稀相区 颗粒流动特性 数值模拟 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]