采用欧拉-欧拉双流体模型，用基于全局反应的涡耗散概念方法描述循环流化床内挥发份均相燃烧反应,用Fluent软件结合UDF（用户自定义函数）热态模拟得到炉内流动和燃烧状况，模拟得到的沿炉高气温分布和出口烟气组分与实验值吻合，验证了模型的准确性，并且采用EDC-G方法优于采用ED-FR方法。在此基础上，分析了炉内颗粒速度和浓度分布，得出炉内主要气体分布。得到沿炉高反应速率分布曲线，C和O2反应速率高于C和CO反应速率，密相区CO与O2反应速率高于CH4与O2，稀相区CH4与O2反应速率高于CO和O2反应速率。

The eddy dissipation concept（EDC）model based on global reaction mechanisms is embedded with Eulerian-Eulerian two-fluid approach to simulate the homogeneous reaction in the volatile gases in the circulated fluid boiler.Fluent software is used for the thermal simulation of the boiler and the results of temperature distribution along height and gas mass friction of outlet are in agreement with the experimental data,verifying the accuracy of the model and the superiority of the eddy dissipation concept with global reactions (EDC-G) model over the eddy dissipation or finite rate (ED-FR) model.Based on this model,the particle velocity and concentration distribution in the boiler are analyzed,and the main gases distribution in the boiler is obtained.The distribution curve of reaction rates along the height of boiler indicates that the reaction rate of C and O2 is higher than that of C and CO.The reaction rate of CO and O2 is higher than that of CH4 and O2 in the dense phase region and lower than that of CH4 and O2 in the dilute phase region.

TK224.1