摘要
建立了基于欧拉-离散单元方法的流化床燃烧数学模型并用该模型对流化床锅炉热烟气点火过程进行了数值模拟,模拟结果成功描述出了该过程的主要特征。研究表明流化床锅炉启动过程分为三个阶段:热气体对床料的纯加热阶段、煤颗粒燃烧后的床温快速上升阶段和床温变化平稳的正常运行阶段。文中模拟结果与实测及岑可法等采用整体模型的模拟结果一致,但在对过程细节的描述上要优于总体模型。
Mathematical model for fluidized bed combustion was established based on Euler-Discrete Element Method (DEM). Hot gas ignition process of a FBC boiler was numerically simulated By means of this model, and the main characteristics during this process were acquired. Simulated bed temperature change curve shows this process consists of three stages: pure heating up stage of hot gas to coal particles, rapid increasing stage of bed temperature after coal particles begin to combust and normal operation stage characterized by slow temperature change. These results are in agreement with test and comprehensive model simulation results, however, DEM is better than comprehensive model in acquiring the detail information.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第3期120-124,共5页
Proceedings of the CSEE
基金
国家自然科学基金项目(50276062)。~~
关键词
流化床锅炉
离散颗粒
床料
床温
点火
流化床燃烧
烟气
并用
模拟
煤颗粒
Thermal power engineering
Fluidized bed combustion
Hot gas ignition
Discrete Element Method
Simulation
