多级回热式小型太阳能海水淡化系统的性能优化研究

OPTIMIZATION STUDY OF A SMALL-SIZE SOLAR SEA-WATER DESALINATION SYSTEM WITH MULTI-EFFECT EVAPORATING AND HEAT RECOVERY

以由4个集热/回热单元组成的小型集约化多级回热式太阳能海水淡化为研究对象(集热采光面积为2.31m^2),研究该系统在高压和常压状态运行工况下的淡水制水量和太阳能利用率。通过实际的运行实验数据比较天气情况、季节变化、最高集热温度、运行蒸汽压力设定等系统运行参数对系统整体的制水量、系统总效率集热和回热性能的影响。实验结果显示,该装置单位集热面积的制水量最高可达2.14 kg/(h·m^2),制水性能系数最高为2.5,总效率最高为1.35,系统各项性能较为优越。

A novel small-sized integrated solar desalination system with multi-stage evaporation/heat recovery processes is designed and tested in this study. The system consists of four linked collecting units and the heat collecting area is about 2.31 m2. The experiments are carried out under different operating conditions for investigating the system performance including freshwater yield and solar energy utilization Through the present experiments, the effect of the operating pressures, operating pressure adjusting methods, weather conditions, season conditions, maximum collecting temperature on freshwater yield, system total efficiency and heat recovery performance are investigated and discussed in detail. The experimental results showed that the freshwater yield of unit collecting area can reach 2.138 kg/（h m2） , the highest value of performance ratio of freshwater-making is about 2.5 and the collecting and heat recovery composite efficiency can reach about 1.35, which indicates outstanding freshwater-making performance.