基于吸收式换热技术的多段立式吸收-蒸发器的实验研究与应用

发布时间：2018-07-05 16:59

  本文选题：集中供热 + 吸收式换热　； 参考：《科学通报》2015年31期

【摘要】：吸收式换热器是吸收式热泵应用于集中供热的关键核心部件.采用多段吸收式热泵机构可以有效提升机组性能:一次网回水温度一定时可大幅降低总传热面积,更重要的是在机组面积不变情况下显著降低一次网回水温度,实现单段机组无法实现的参数.本文在此技术基础上,设计并制作了三段大温差立式降膜吸收-蒸发器单元,并进行了多组工况的实验,测试其性能.该实验单元可以实现水侧大温差,形成三级蒸发压力梯度,与传统单段吸收机相比,实现了梯级换热,换热过程更加匹配;建立一维吸收器传热传质模型,分析并解释了实验中吸收器出现的冷却水出口温度高于溶液温度的现象.实验单元直接应用于实际供热工程中,在不同供暖工况下取得了良好的效果,一次网回水温度可以低至30℃以下.
[Abstract]:Absorption heat exchanger is the key component of absorption heat pump used in central heating. The multi-stage absorption heat pump mechanism can effectively improve the performance of the unit: the total heat transfer area can be greatly reduced when the backwater temperature of the primary net is fixed, and more importantly, the backwater temperature of the primary net can be significantly reduced when the unit area is constant. The parameters that can not be realized by single stage unit are realized. Based on this technique, a three-stage vertical falling film absorption-evaporator unit with large temperature difference is designed and fabricated. The experimental unit can realize the large temperature difference on the water side and form the three-stage evaporation pressure gradient. Compared with the traditional single-stage absorber, the cascade heat transfer is realized, and the heat and mass transfer model of the one-dimensional absorber is established. The phenomenon that the outlet temperature of cooling water in the absorber is higher than the solution temperature is analyzed and explained. The experimental unit is directly applied to the actual heating engineering, and good results have been obtained under different heating conditions. The backwater temperature of the primary grid can be as low as 30 鈩，

本文编号：2101001