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。
Abstract
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
Key words
thermodynamics /
power generation /
geothermal energy /
optimization /
double-stage organic flash cycle /
ejector
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 韩中合, 梅中恺, 李鹏. 中温有机朗肯循环多目标优化及工质筛选[J]. 太阳能学报, 2019, 40(10): 2739-2747.
HAN Z H, MEI Z K, LI P.Multi-objective optimization and working fluid selection of medium temperature organic rankine cycle[J]. Acta energiae solaris sinica, 2019, 40(10): 2739-2747.
[2] 李新国, 高冠怡, 吴晓松, 等. 结合闪蒸循环的有机朗肯循环以提升循环性能研究[J]. 太阳能学报, 2021, 42(12): 22-28.
LI X G, GAO G Y, WU X S, et al.Study of organic rankine cycle combined with flash cycle to improved cycle performance[J]. Acta energiae solaris sinica, 2021, 42(12): 22-28.
[3] LEE H Y, PARK S H, KIM K H.Comparative analysis of thermodynamic performance and optimization of organic flah cycle (OFC) and organic Rankine cycle (ORC)[J]. Applied thermal engineering, 2016, 100: 680-690.
[4] HO T, MAO S S, GREIF R.Comparison of the Organic flash cycle(OFC) to other advanced vapor cycles for intermediate and high temperature waste heat reclamation and solar thermal energy[J]. Energy, 2012, 42(1): 213-223.
[5] NEMATI A, NAMI H, YARI M.Assessment of different configurations of solar energy driven organic flash cycles (OFCs) via exergy and exergoeconomic methodologies[J]. Renewable energy, 2018, 115: 1231-1248.
[6] BACCIOLI A, ANTONELLI M.Organic flash cycles: off-design behavior and control strategies of two different cycle architectures for waste heat recovery applications[J]. Energy conversion and management, 2018, 157: 176-185.
[7] 相华江, 张凇源, 葛众, 等. 地热水驱动的喷射式有机闪蒸循环性能分析[J]. 化学工程, 2020, 48(10): 11-16, 39.
XIANG H J, ZHANG S Y, GE Z, et al.Performance analysis of organic flash cycle with ejector driven by geothermal water[J]. Chemical engineering, 2020, 48(10): 11-16, 39.
[8] MONDAL S, ALAM S, DE S.Performance assessment of a low grade waste heat driven organic flash cycle (OFC) with ejector[J]. Energy, 2018, 163: 849-862.
[9] LIU X, LI H S, BU X B, et al.Performance characteristics and working fluid selection for low-temperature binary-flashing cycle[J]. Applied thermal engineering, 2018, 141: 51-60.
[10] HO T, MAO S S, GREIF R.Increased power production through enhancements to the organic flash cycle (OFC)[J]. Energy, 2012, 45(1): 686-695.
[11] 黄桂冬, 张凇源, 葛众, 等. 基于内置换热器有机闪蒸循环的热性能研究[J]. 化工学报, 2020, 71(7): 3080-3090.
HUANG G D, ZHANG S Y, GE Z, et al.Thermal performance study of organic flash cycle based on internal heat exchanger[J]. CIESC journal, 2020, 71(7): 3080-3090.
[12] EBADOLLAH M, ROSTAMZADEH H, PEDRAM M Z, et al.Proposal and assessment of a new geothermal-based multigeneration system for cooling, heating, power, and hydrogen production, using LNG cold energy recovery[J]. Renewable energy, 2019, 135: 66-87.
[13] WANG S L, YANG H M, SHI Z Y, et al.Renewable hydrogen production from the organic fraction of municipal solid waste through a novel carbon-negative process concept[J]. Energy, 2022, 252: 124056.
[14] 李慧君, 蒋长辉, 范伟, 等. 变热源有机朗肯循环系统的综合性能分析[J]. 动力工程学报, 2022, 42(3): 286-292.
LI H J, JIANG C H, FAN W, et al.Comprehensive performance analysis of organic Rankine cycle system with variable heat source[J]. Journal of Chinese Society of Power Engineering, 2022, 42(3): 286-292.
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）
PDF(1915 KB)
