自然循环外加热式蒸发器二维数值模拟及其性能分析

Second-Dimensional Numerical Simulation Study on the Characteristics of Flow Field in Self Circulation Thin-Film Evaporator

自然循环外加热式蒸发器是低浓度固碱生产过程中的关键性设备。为了提高蒸发器性能,采用Fluent6.3软件对蒸发器流场内流体进行二维数值模拟,得出蒸发器内流体流动的速度场和温度场的分布情况,同时分析了二次蒸气出口尺寸对蒸发器性能的影响,结果对自然循环外加热式蒸发器工艺条件和结构的优化具有参考价值。

Self circulation thin-film evaporator is an important equipment in low concentration of soda production system, its performance is key to quality of soda. In order to improve evaporator＇s performance, Fluent6.3 package were used to simulate the 2-D two- phase flow in the self circulation thin-film evaporator and obtained the distribution of velocity field and temperature field in evaporator, and at the same time analyzed the added vapour outlet dimensions＂ influence on evaporator＇s performance. Simulation results will be helpful in optimizing process conditions and structure of the self- circulating thin-film evaporators in soda production system. [ Ch ,9 fig. 2 tab. 8 ref. ]