逆流形式下废液与空气热湿传递驱动力的解耦分析及实验验证

为了深入研究逆流形式下废液与非饱和空气热湿传递过程中传热驱动力与传质驱动力之间的关系,建立了逆流形式下废水和非饱和空气的热质交换耦合模型,利用数学方法对该模型的热湿传递驱动力进行解耦分析。将利用根据文献中逆流除湿/再生搭建的实验装置和本文搭建的废液再生实验装置得到的实验数据进行比较、验证。结果发现:相互耦合的温度差驱动力Δt和含湿量差驱动力Δω可以由相互独立的焓差驱动力Δh和相对湿度差驱动力Δφ表示,这两个相互独立的驱动力可以用来独立表征废液和非饱和空气的传热传质过程;相关文献中的和该装置中的实验结果与解耦分析的数值模拟结果一致:非饱和空气出口的所有参数在相互独立的驱动力所界定的范围内变化。

Decoupling analysis and experimental verification of the driving force for heat and moisture transfer between waste liquid and air in a countercurrent form

In order to study the relationship of driving forces for heat and mass transfer in the countercurrent waste liquid and unsaturated air process, a coupling model of this process was established, and the decoupling analysis of the driving forces for heat and moisture transfer in the model was carried out by mathematical method. The validation of the experimental data obtained from the countercurrent dehumidification/regeneration experimental set and the waste liquid regeneration experimental device built in this study is performed. The results find that the coupled driving force of temperature difference and moisture difference can be replaced by enthalpy difference driving force and relative humidity difference driving force, respectively, which can be used to independently characterize the heat and mass transfer process between waste liquid and unsaturated air. The experimental results from the literatures and the experimental device built in this study agree well with the numerical simulation results by the decoupling analysis. All parameters of the unsaturated air at the outlet vary within the range defined by the independent driving force.