Absorption characteristics of NH3/NASCN working pair in an adiabatic absorber with structured packing
Absorption characteristics of NH3/NASCN working pair in an adiabatic absorber with structured packing
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规整填料绝热吸收器中NH3/NASCN工质对的吸收特性
DOI：
10.1016/j.applthermaleng.2020.116325
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发表时间：
2020-11
影响因子：
6.4
通讯作者：
Cai Dehua
中科院分区：
文献类型：
--
作者：
Liang Xiao;He Guogeng;Zhou Sai;Hao Zian;Cai Dehua
规整填料绝热吸收器广泛应用于中小型吸收式制冷装置中。氨-硫氰酸钠工质对是一种很有潜力的小型吸收式制冷工质对。在不锈钢规整填料绝热吸收器中，对氨-硫氰酸钠工质对的吸收特性进行了实验研究。本文设计并建造了一个由4块不锈钢规整填料组成的绝热吸收器和一个实验装置，以评价其吸收特性。通过调节吸收器的工作条件，如溶液入口质量流量、吸收压力和溶液入口过冷度，得到了冷却水温度在27.3 ~ 33.5 °C范围内的各种实验状态点。对比了不同工况下表征吸收性能的参数。在本实验研究期间，雷诺数为339 ~ 611时，传质系数达到最大值4.67 × 10- 6 m/s。在1.7-27.1 °C范围内，溶液入口过冷度与吸收率呈线性关系，而吸收器热负荷在1.05-3.09 kW范围内与吸收率呈线性关系。吸收压力和溶液入口流动强度是吸收过程的促进因素。并对压力势、接近平衡因子等参数进行了分析。实验结果表明，溶液入口流动强度、蒸汽压与溶液分压之差（即芯吸收驱动力）是影响吸收过程性能的两个主要因素。通过合理调节吸收压力、溶液入口过冷度和冷却水温度等变量，可以增大压差，提高吸收性能。规整填料绝热吸收器也具有较高的吸收效率，适用于小型吸收式制冷系统。另外，通过本文的研究，得到了氨-硫氰酸钠工质对吸收技术的各项参数数据和关联式，为氨-硫氰酸钠工质对吸收技术的进一步研究和规整填料绝热吸收器的设计提供了参考。该研究为氨/盐吸收式制冷技术的研究和氨-硫氰酸钠工质对规整填料绝热吸收器的设计提供了重要参考。
Adiabatic absorbers with structured packing are widely used in small and medium scale absorption refrigeration units. Also, ammonia-sodium thiocyanate is a considerable potential working pair for small-scale absorption refrigeration system. The present study experimentally analyzes the absorption characteristics of ammonia-sodium thiocyanate working pair in an adiabatic absorber with stainless-steel structured packing. An adiabatic absorber filled with 4 blocks of stainless-steel structured packing as well as an experimental apparatus have been carefully designed and constructed to evaluate the absorption characteristics. Through the adjustments of working conditions of absorber such as solution inlet mass flowrate, absorption pressure and solution inlet subcooling, various experimental state points are obtained at cooling water temperatures ranging from 27.3 to 33.5 °C. Contrasts of parameters characterizing absorption performance have been made under these various working conditions. In the period of present experimental research, mass transfer coefficient reaches its maximum at 4.67 × 10-6m/s at Reynolds numbers ranging from 339 to 611. Subcooling degree of inlet solution at range of 1.7–27.1 °C is supposed to gain a linear relationship with absorption ratio while heat load with range of 1.05–3.09 kW of the absorber gains the reverse. Absorption pressure and solution inlet flowing intensity are considered to be the promotion factor for absorption process. Parameters such as pressure potential, approach to equilibrium factor have also been analyzed. According to all these experimental results, solution inlet flowing intensity, differences between vapor pressure and solution partial pressure (i.e. the core absorption driving force) are the two main factors which greatly influence the performance of absorption process. Variables such as absorption pressure, solution inlet subcooling and cooling water temperature can be rationally adjusted in order to increase the pressure difference, enhancing the absorption performance. The adiabatic absorber with structured packing also gains a relatively high-efficient absorption performance which is sufficient for the small-scale absorption refrigeration system. Otherwise, through this study, all the parameters’ data and correlations are concluded for further study of absorption technique with ammonia-sodium thiocyanate working pair, and provide references for the designing of the adiabatic absorber with structured packing. The presents study provides significant reference for advance of research of ammonia/salt absorption refrigeration technology as well as design of structured packing adiabatic absorber with ammonia-sodium thiocyanate working pair.
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