地热源双级喷射有机闪蒸循环热力分析及优化  

THERMODYNAMIC ANALYSIS AND OPTIMIZATION OF GEOTHERMAL SOURCE DOUBLE-STAGE ORGANIC FLASH CYCLE WITH EJECTOR

作　　者：杨新乐[1] 王雨实 卜淑娟 李惟慷[1] 戴文智[1] 苏畅[1] Yang Xinle;Wang Yushi;Bu Shujuan;Li Weikang;Dai Wenzhi;Su Chang(School of Mechanical Engineering,Liaoning Technical University,Fuxin 123032,China)

机构地区：[1]辽宁工程技术大学机械工程学院,阜新123032

出　　处：《太阳能学报》2023年第9期503-509,共7页Acta Energiae Solaris Sinica

基　　金：辽宁省兴辽英才计划(XLYC1807150);辽宁省教育厅科研项目(LJKZ0367,LJ2020JCL035);辽宁省自然科学基金面上项目(2022-MS-398)。

摘　　要：为有效利用有机闪蒸循环(OFC)闪蒸后的饱和液态工质,提高中低温热源的回收效率,构建地热水驱动的双级喷射有机闪蒸循环(DEOFC)系统,探究关键参数对系统的影响,并对系统进行多目标优化。结果表明:DEOFC闪蒸压力和高压膨胀机出口压力最优时,热源温度升高,系统净输出功、热效率、效率增大;当温度升至工质的特征温度时,趋势发生变化。多目标优化时,R601a表现出最佳性能。与单级喷射有机闪蒸循环(SEOFC)相比,DEOFC净输出功和效率均存在较大优势。In order to effectively utilize the saturated liquid working fluid after flash evaporation of organic flash cycle(OFC)and improve the recovery efficiency of medium and low temperature heat sources,a double-stage organic flash cycle system with ejector(DEOFC)driven by geothermal water is established,the influence of key parameters on the system is explored,and the system is optimized with multiple objectives.The results show that when the flash pressure and the outlet pressure of the high-pressure expander of DEOFC are optimal,with the increase of heat source temperature,the net output work,thermal efficiency and exergy efficiency of the system show the trend of increase,which change when the temperature rises to the characteristic temperature of the working medium.When performing multi-objective optimization,R601a shows the best performance.Compared with the single-stage organic flash cycle with ejector(SEOFC)system,DEOFC has great advantages in net output work and exergy efficiency.

关 键 词：热力学 发电 地热能 优化 双级有机闪蒸循环 喷射器 

分 类 号：TK115[动力工程及工程热物理—热能工程]