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为实现无泵循环高效降膜蒸发换热,提出了基于蒸汽举送效应的新型复合降膜蒸发器。通过建立数学模型,针对管径的改变研究其水力特性和换热性能。结果表明:输运段管径的增加不仅提高了输送流量和高度比H/L(泵送高度与为克服管道阻力所需的浸没深度之比),而且强化了蒸发段的传热传质性能,提高整个系统的性能;而换热段管径的改变主要影响系统的传热传质性能,对输送段水力特性不产生影响。
In order to realize high efficiency falling film evaporation heat transfer without pump circulation, a new type of composite falling film evaporator based on steam lifting effect was proposed. Through establishing the mathematical model, the hydraulic characteristics and the heat transfer performance are studied according to the change of the pipe diameter. The results show that the increase of pipe diameter not only increases the flow rate and height ratio H / L (the ratio of pumping height to immersion depth to overcome pipeline resistance), but also enhances the heat and mass transfer performance , Improve the performance of the entire system; and the change of the heat transfer section diameter mainly affects the heat and mass transfer performance of the system, does not have an impact on the hydraulic characteristics of the conveying section.