| 摘要: |
| 机械蒸气再压缩(MVR)系统是一种高效的蒸发系统,本文通过模拟与实验的方法对MVR系统再生高浓度CaCl,溶液的性能进行研究,分析了蒸发压力、入口溶液质量浓度等输入参数对MVR系统再生性能的影响。研究结果表明:蒸发压力通过吸气密度影响再生速率,蒸发压力越大,再生速率越大,系统能耗越大;入口CaCl,溶液质量浓度为0.3,当蒸发压力从20kPa增至80kPa,MVR再生系统的SEC值从46.67kWh/m3增至79.51kWh/m3,系统COP从14.4降至8.2。入口溶液质量浓度通过 溶液沸点温升影响MVR系统再生性能,溶液质量浓度越高,沸点温升越大,压缩机功耗越大;蒸发压力为20kPa,当入口CaCl, 溶液质量浓度从0.25增至0.39时,系统SEC值从36.68kWh/m3增至75.76kWh/m3,系统COP从18.1降至9.1。从溶液质量 浓度、溶液等效含湿量以及蒸发压力3个维度分析,CaCl,溶液相比LiCl溶液和LiBr溶液在MVR系统中的再生性能最优。 |
| 关键词: 机械蒸气再压缩系统 溶液再生 CaCl溶液 数学模型 |
| DOI： |
| 投稿时间：2020-08-23 修订日期：2020-11-05
|
| 基金项目:国家重点研发计划(2018YFC0705202)资助项目。 |
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| Regeneration Performance of High Concentration Solution by Mechanical Vapor Recompression System |
| Zhang Qinling,Liu Xiaohua,Zhang Tao |
| (Department of Architectural Technology Science, Tsinghua University) |
| Abstract: |
| A mechanical vapor recompression (MVR) system is an efficient evaporation system. In this study, the performance of an MVR system in generating high concentration CaCl2 solutions was studied through simulation analysis and experiments. The influence of input parameters, including evaporation pressure and inlet dilute solution concentration, on the regeneration performance of the MVR system was studied. The regeneration rate is affected by evaporation pressure on which the suction density is depended. The higher the evaporation pressure, the higher the regeneration rate and energy consumption of the system. Under the condition that the concentration of the CaCl2 solution at the inlet was 0.3, the SEC value of MVR regeneration system increased from 46.67 to 79.51 kWh/m3, and the COP of the system decreased from 14.4 to 8.2 when the evaporation pressure increased from 20 to 80 kPa. The concentration of the inlet solution affects the regeneration performance of the MVR system by increasing the boiling point of the solution. The higher the concentration of the solution, the higher the boiling point, and the higher the power consumption of the compressor. Under the condition that the evaporation pressure was 20 kPa, the SEC value of the system increased from 36.68 to 75.76 kWh/m3, and the COP of the system decreased from 18.1 to 9.1 when the concentration of inlet CaCl2 solution increased from 0.25 to 0.39. In terms of solution concentration, equivalent moisture content, and evaporation pressure, the CaCl2 solution had the best regeneration performance in the MVR system compared with the LiCl and LiBr solutions. |
| Key words: mechanical vapor recompression system solution regeneration calcium chloride solution mathematical model |
