循环流化床蒸发器中的压降与颗粒分布的研究

Pressure Drop and Particles Distribution in the Vapor-Liquid-Solid Multi-Pipe Circulating Fluidized Bed Evaporator

为研究汽-液-固三相多管循环流化床蒸发器中的压降和颗粒分布特性,设计并构建了汽-液-固多管循环流化床蒸发系统。利用压力传感器、CCD图像采集和数据处理系统,研究了液体循环流量、热通量、颗粒加入量等参数对于加热管束中压降和颗粒分布的影响。结果表明:随着液体循环流量和颗粒加入量的增加,颗粒分布的不均匀度明显降低,管束压降变大;随着热通量的增大,颗粒分布的不均匀度降低,管束压降呈现波动状态,但管束压降值始终小于加热功率为0时的值。

A transparent multi-tube vapor-liquid-solid circulating fluidized bed evaporator was designed and built to research the pressure drop and distribution of solid particles in the heating pipe bundle.The effects of circulating flow rate,heat flux and amount of additive particle on pressure drop and distribution of solid particles in the heating pipe bundle were investigated using the pressure sensors and CCD image gathering and processing system.The results show that as the circulating flow rate and additive particle amount increase,the nonhomogeneity of particle distribution decreases and the pipe bundle pressure drop increases;while the heat flux increases,the nonhomogeneity of particle distribution decreases and the pipe bundle pressure drop fluctuates,but the pipe bundle pressure drop value is always less than the value gathered when the heating power is zero.