海洋温差发电混合工质二次热回收循环系统理论和实验研究  

Theoretical and Experimental Study on Secondary Heat Recovery Cycle System of Mixed Working Fluid for Ocean Thermal Energy Conversion

作　　者：陈凤云 彭景平 刘蕾 葛云征 王泉斌 刘伟民 CHEN Fengyun;PENG Jingping;LIU Lei;GE Yunzheng;WANG Quanbin;LIU Weimin(First Institute of Oceanography,MNR,Qingdao 266061,China)

机构地区：[1]自然资源部第一海洋研究所,山东青岛266061

出　　处：《海洋科学进展》2024年第1期185-195,共11页Advances in Marine Science

基　　金：山东省自然科学基金项目(ZR201910310263);国家自然科学基金项目(41976204)。

摘　　要：因海洋温差发电系统中可利用的温差较小,发电效率相对较低,寻求海洋温差发电系统高效热力循环方式一直是该领域的重要研究内容。本文构建了非共沸混合工质的海洋温差发电热力循环,增加了稀溶液支路的二次热回收装置,并进行理论分析与数值计算,得到了循环效率与工质浓度、透平进口压力和抽气系数等参数之间的关系。结果表明:通过增加稀溶液支路的二次热回收装置,循环效率最高可达5.25%。研建了10 kW二次热回收海洋温差发电系统,得到了平稳运行工况下的系统性能,发电系统效率最高达3.8%,同时得到了蒸发器和冷凝器在该换热条件下的换热系数,为工程应用提供基础数据和技术支撑。Due to the small temperature difference available in the ocean thermal energy conversion(OTEC)system and the low power generation efficiency,searching for high-efficiency thermal cycle has always been an important research aspact in this field.This study constructed a thermodynamic cycle of OTEC with non-azeotropic mixed working fluid,added the secondary heat recovery of the dilute solution branch,performed theoretical analysis and numerical calculation.The relationship between cycle efficiency and parameters such as working fluid concentration,turbine inlet pressure and extraction factor was obtained.The results showed that the cycle thermal efficiency can reach up to 5.25%.A 10 kW secondary heat recovery OTEC system was built,and the system performance under stable operation conditions was obtained.The efficiency of the power generation system is up to 3.8%,and the heat transfer coefficients of the evaporator and condenser under this heat transfer condition were obtained,which provides basic data and technical support for its engineering application.

关 键 词：海洋温差发电 热力循环 循环效率 工质浓度 抽气系数 

分 类 号：TK11[动力工程及工程热物理—热能工程]