蓄热氧化炉运行过程中蜂窝陶瓷的换热分布特性研究

A Study on the Heat Transfer Distribution Characteristics of Honeycomb Ceramics during the Operation of Regenerative Thermal Oxidiser

以单块蜂窝陶瓷蓄热体为研究对象,建立简化模型,对高温烟气和低温空气周期性交替流入单块蓄热体的换热过程进行数值模拟,分析结构参数对蓄热体内传热的影响规律。研究发现:蓄热体的换热能力随着圆角半径的增加而减小;蓄热体的温度效率和热回收率随着孔壁厚度的增加而增加,质量传热系数随着壁厚的增加而减小;蓄热体的换热比表面积随着格孔边长的增加而减小,蓄热体温度效率和热回收率也随着格孔边长的增加而减小。

A simplified model was established to simulate the heat transfer process of high temperature flue gas and low temperature air flowing into a single honeycomb ceramic regenerator alternately,and the influence of structural parameters on heat transfer in the regenerator was analysed.It is found that the heat transfer capacity of the regenerator declines along with the increase of fillet radius,and its temperature efficiency and heat recovery rise along with the increase in thickness of hole wall whilst the mass transfer coefficient of heat decreasing.Its specific surface area of heat transfer reduces along with prolonging the length of cell side,and so do its temperature efficiency and heat recovery.