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作 者:周文博 殷姜维 张丹[1] 杨越 于佳豪 赵冰超[2] ZHOU Wenbo;YIN Jiangwei;ZHANG Dan;YANG Yue;YU Jiahao;ZHAO Bingchao(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;College of Energy and Power Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450045,Henan,China)
机构地区:[1]西安交通大学能源与动力工程学院,陕西西安710049 [2]华北水利水电大学能源与动力工程学院,河南郑州450045
出 处:《化工学报》2024年第S01期85-94,共10页CIESC Journal
基 金:国家自然科学基金项目(51976162)。
摘 要:为利用太阳能实现含盐废水的高效、低成本的深度脱盐,设计搭建了热辐射加热单液滴实验系统,以NaCl水溶液为工质,针对热辐射加热下单液滴蒸发过程开展了实验研究。采用波长为1450、1930 nm的激光器为热辐射源,功率密度为(1.4~2.1)×10^(5)W·m^(-2);液滴初始质量分数为0.13~0.26、初始体积为1.0~5.0μl。结果表明:(1)NaCl水溶液液滴蒸发过程可分为升温、析晶、热胀和降温四个阶段,其中析晶和热胀段是液滴蒸发的主要阶段;(2)提高外部辐射功率或采用大吸收系数波段可同时缩短升温、析晶及热胀段时长,提高表面平均蒸发速率;(3)提高液滴初始质量分数或初始体积可同时提高析晶温度、热胀段最高温度及表面平均蒸发速率,析晶段时长随初始质量分数的增大而缩短,但与液滴初始体积无关;(4)本文研究范围内NaCl水溶液液滴表面平均蒸发速率介于(0.7~7.4)×10^(-8)kg·s^(-1)之间,液滴温度依然是影响表面平均蒸发速率的主要因素。根据实验结果给出了热辐射加热下NaCl水溶液液滴表面平均蒸发速率的实验关联式,其计算值与实验值的主体误差在±20%之内。本文的研究结果可为热辐射驱动下含盐废水深度脱盐系统的设计和运行提供参考。In order to achieve efficient and low-cost desalination of saline wastewater using solar energy,this study designed and constructed a single droplet experimental system with thermal radiation heating.NaCl water solution was used as the working fluid and experimental research on the evaporation process of single droplets under thermal radiation heating was conducted.A laser with wavelengths of 1450 and 1930 nm was used as the thermal radiation source,with a power density between 1.4×10^(5)and 2.1×10^(5)W·m^(-2),the initial mass fraction of the droplets ranged from 0.13 to 0.26 and the initial volume ranged from 1.0 to 5.0μl.The results indicate:(1)The evaporation process of NaCl water solution droplets can be divided into four stages:heating,crystallization,thermal expansion,and cooling stage,with crystallization and thermal expansion being the main stages of droplet evaporation.(2)Increasing external radiation power or using high absorption coefficient bands can simultaneously shorten the duration of the heating,crystallization,and thermal expansion stages;increase the average surface evaporation rate.(3)Increasing the initial mass fraction or initial volume of the droplets can simultaneously increase the crystallization temperature,the maximum temperature during the thermal expansion stage and the average surface evaporation rate;the duration of the crystallization stage decreases with an increase in the initial mass fraction,but it is independent of the initial volume of the droplets.(4)Within the scope of this study,the average surface evaporation rate of NaCl water solution droplets ranged from 0.7×10^(-8)to 7.4×10^(-8)kg∙s^(-1)and the droplet temperature remains the main factor affecting the surface evaporation rate.Based on the experimental results,an experimental correlation formula for the average surface evaporation rate of NaCl water solution droplets under thermal radiation heating was provided,with the main error between calculated and experimental values within±20%.The results of this study
分 类 号:TK124[动力工程及工程热物理—工程热物理]
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