A Model for Agglomeration in Bio-fuel Fired Fluidized Bed  

作　　者：Shiyuan Li Linlin Shang Haipeng Teng Qinggang Lu 

机构地区：[1]Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Journal of Thermal Science》2010年第5期451-458,共8页热科学学报（英文版）

基　　金：the support of National Natural Science Foundation of China (Project Code:50706055)

摘　　要：A mathematical model has been developed to describe the agglomeration process in bio-fuel fired fluidized bed combustor. Based on the balance mechanism of the adhesive force caused by liquid bonding between two parti- cles and the breaking force induced by bubbles in the fiuidized bed, the model considers modified Urbain model and chemical equilibrium calculations using FactSage modeling. This model prediction accounts for the evolve- ment of the adhesive and breaking forces, and clearly demonstrates that the different composition of ash, the in- creasing liquid phase matter and the fiuidization velocity cause defluidization in fluidized bed. In this model, it is the first time to hypothesize that the bonding stress between two particles is proportional to mass fraction of liq- uid phase and inversely proportional to the diameter of particles and viscosity of liquid phase. The defluidization time calculated by this model shows good agreement with that from the experimental data.

关 键 词：BIO-FUEL Fluidized bed AGGLOMERATION DEFLUIDIZATION Force balance 

分 类 号：TQ517[化学工程] TK229.66[动力工程及工程热物理—动力机械及工程]