基于光伏光热耦合驱动的海水淡化系统性能分析
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摘要
利用太阳能进行海水淡化可以节约能源、缓解水资源的短缺,设计了一种光伏光热耦合驱动的海水淡化系统,利用海水冷却光伏系统以提高其光电转化效率,通过光热系统提高海水温度以增加淡水产量。研究了光伏光热耦合驱动的海水淡化系统的性能,分析了扩容蒸发压力和太阳辐照强度等关键因素对淡水产量及发电量的影响,得到了海水淡化系统的运行特性及主要热经济性指标。结果表明:设计工况时,系统电功率为510. 33 W/m2,比相同参数的纯光伏系统提高了408. 87 W/m2;淡水产量为7. 3 kg/h,相比于常规多级闪蒸系统(Multiplestage Flashing System,FSF)系统有一定的提升。变工况时,随着辐照强度从200 W/m2增大到1 200 W/m2,电功率从118. 49 W/m2升高到588. 12 W/m2;淡水产量则从9. 17 kg/h降低到6. 81 kg/h。随着海水入口温度从10℃升高到30℃,电功率从484. 57 W/m2降低到436. 72 W/m2,淡水产量则从7. 3 kg/h降低到6. 5 kg/h。结果表明,该系统在任何辐照条件下均有较高的综合收益。
Seawater desalination by solar energy can save energy and alleviate water resources shortage. A seawater desalination system co-driven by photoelectricity & optothermal was designed which uses seawater cooling photoelectric system to improve the photoelectric conversion efficiency and raise the water temperatures by solar-thermal systems in order to increase fresh water production.The performance of the seawater desalination system driven by PV/T was studied,and the effects of flash vaporization pressure and solar radiation intensity on fresh water production and power generation were analyzed. The operating characteristics and main thermal economy indexes of seawater desalination system were obtained. The results indicate that: under design conditions,the electric power is 510.33 W/m2,408.87 W/m2 high than pure PV systems of the same parameter;the fresh water production is 7. 3 kg/h,which is higher than the conventional MSF system. Undervariable operating conditions,with irradiation intensity increasing from 200 W/m2 to 1 200 W/m2,the electrical power increases from 118.49 W/m2 to 588.12 W/m2; while the fresh water production drops down from 9.17 kg/h to 6.81 kg/h. Increased along with the seawater inlet temperature from10 ℃ to 30 ℃,the electric power reduces from 484. 57 W/m2 to 436. 72 W/m2,and the fresh water production reduces from 7.3 kg/h to 6.5 kg/h. The proposed system has higher benefits under any radiation conditions.
Seawater desalination by solar energy can save energy and alleviate water resources shortage. A seawater desalination system co-driven by photoelectricity & optothermal was designed which uses seawater cooling photoelectric system to improve the photoelectric conversion efficiency and raise the water temperatures by solar-thermal systems in order to increase fresh water production.The performance of the seawater desalination system driven by PV/T was studied,and the effects of flash vaporization pressure and solar radiation intensity on fresh water production and power generation were analyzed. The operating characteristics and main thermal economy indexes of seawater desalination system were obtained. The results indicate that: under design conditions,the electric power is 510.33 W/m2,408.87 W/m2 high than pure PV systems of the same parameter;the fresh water production is 7. 3 kg/h,which is higher than the conventional MSF system. Undervariable operating conditions,with irradiation intensity increasing from 200 W/m2 to 1 200 W/m2,the electrical power increases from 118.49 W/m2 to 588.12 W/m2; while the fresh water production drops down from 9.17 kg/h to 6.81 kg/h. Increased along with the seawater inlet temperature from10 ℃ to 30 ℃,the electric power reduces from 484. 57 W/m2 to 436. 72 W/m2,and the fresh water production reduces from 7.3 kg/h to 6.5 kg/h. The proposed system has higher benefits under any radiation conditions.
引文
[1]杨志鹏,刘芳,杨晖.太阳能在海水淡化中的应用[J].太阳能,2017(5):51-54.
[2]张学镭,卜跃刚,刘强,等.太阳能海水淡化的新技术发展现状[J].电力科学与工程,2017,33(12):1-8.
[3]颜苏莉,孙婧豪.我国光伏产业的发展现状、存在问题及解决之道[J].华北电力大学学报(社会科学版),2016,43(1):9-12.
[4]汪晨辉.光伏光热系统中聚光技术的优化分析和实验研究[D].北京:华北电力大学,2016.
[5]肖红升,刘振华,王登锋.多级回热式小型太阳能海水淡化系统的性能优化研究[J].太阳能学报,2016,37(11):2916-2921.
[6]闫晓彤,袁合涛,杨可,等.一种光热/光伏耦合式小型太阳能海水淡化装置的研制[J].水处理技术,2016(10):76-79.
[7]李强,任建波,吕宏卿,等.蓄热式倾斜芯型太阳能蒸馏系统实验研究[J].现代化工,2016(6):141-144.
[8]田兴旺,王晗,孙红欣,等.高效光伏驱动海水淡化装置设计研究[J].绿色科技,2018(2):127-128.
[9]周雷文,桂福坤,朱爱意,等.海岛小型太阳能海水淡化装置及产水量影响研究[J].节能技术,2016,34(3):270-274.
[2]张学镭,卜跃刚,刘强,等.太阳能海水淡化的新技术发展现状[J].电力科学与工程,2017,33(12):1-8.
[3]颜苏莉,孙婧豪.我国光伏产业的发展现状、存在问题及解决之道[J].华北电力大学学报(社会科学版),2016,43(1):9-12.
[4]汪晨辉.光伏光热系统中聚光技术的优化分析和实验研究[D].北京:华北电力大学,2016.
[5]肖红升,刘振华,王登锋.多级回热式小型太阳能海水淡化系统的性能优化研究[J].太阳能学报,2016,37(11):2916-2921.
[6]闫晓彤,袁合涛,杨可,等.一种光热/光伏耦合式小型太阳能海水淡化装置的研制[J].水处理技术,2016(10):76-79.
[7]李强,任建波,吕宏卿,等.蓄热式倾斜芯型太阳能蒸馏系统实验研究[J].现代化工,2016(6):141-144.
[8]田兴旺,王晗,孙红欣,等.高效光伏驱动海水淡化装置设计研究[J].绿色科技,2018(2):127-128.
[9]周雷文,桂福坤,朱爱意,等.海岛小型太阳能海水淡化装置及产水量影响研究[J].节能技术,2016,34(3):270-274.