不同给煤方式下循环流化床锅炉燃烧特性的数值模拟研究

Numerical Simulation Analysis of Combustion Characteristics of Circulating Fluidized Bed Boiler in Different Coal-feed Way

为了分析不同给煤方式对循环流化床锅炉燃烧特性的影响,论文基于fluent软件,搭建了循环流化床炉膛模型,对炉膛内的燃烧特性以及燃烧成分进行模拟计算和分析。利用GAMBIT软件对130 t/h的循环流化床锅炉炉膛进行网格划分,分别对前墙给煤和前后墙给煤条件下的锅炉燃烧过程进行模拟和数值分析。结果表明,前墙给煤方式下,炉膛燃烧温度过渡平滑,分布较为均匀,炉内燃烧充分且较为稳定。中小型锅炉应多采用前墙给煤。

In order to analysis the influence of different coal feeding ways in circulating fluidized bed boiler combustion characteristics, based on the fluent software, a model of circulating fluidized bed furnace was set up. The furnace combustion characteristics and combustion component is Simulated calculation and analysised. GAMBIT software is used to mesh the 130 t/h circulating fluidized bed boiler furnace, doing simulation and numerical analysis on the boiler combustion process under the condition of feeding coal on the front wall and the opposed wall, respectively. The results show that when feeding coals on the front wall, the furnace temperature transits smooth and distribution is relatively uniform, combustion in the furnace is more adequate and stable. Small and medium boiler should adopt more front wall cool - feeding.