循环流化床反应器传热特性

The Heat Transfer Characteristics of Circulating Fluidized Bed Reactor

作为一种新型燃烧装置,循环流化床克服了以燃煤为主的工业锅炉的很多弊端,使燃烧效率提高、污染物减少。针对实验研究流化床相关的传热特性,费用昂贵,且受环境条件的影响严重的问题,运用FLUENT17.0软件作为数值模拟工具就可以解决。依据Tong Zhao等人的实验结果,运用了简化为循环流化床二维平面结构,模拟内部流动和燃烧过程,研究了床温与辐射传热对总传热系数的影响。并且经过理论计算,给出了三条热流密度值沿反应器高度方向的分布规律,为优化设计提供了参考。

As a new type of combustion device,circulating fluidized bed has overcame many disadvantages of coal fired industrial boilers.It has improved combustion efficiency and reduced pollutants.The heat transfer characteristics related to fluidized bed are expensive and are subject to environmental conditions.The FLUENT17.0 software is used as a platform for numerical simulation to solve.Numerical simulations are based on experiments by Tong Zhao et al.A simplified two-dimensional structure of circulating fluidized bed is applied to simulate the internal flow process and combustion process,and the heat transfer problem of fluidized bed is further studied.Based on the heat transfer model,the influence of the bed temperature and radiation heat transfer on the total heat transfer coefficient is researched.After theoretical calculation,the three distribution laws of heat flux density along the height direction of reactor are found,which provides reference for optimization reference.