带有有机朗肯循环（ORC）系统的集成太阳能联合循环的热力学研究。

Thermodynamic Investigation of an Integrated Solar Combined Cycle with an ORC System.

作者信息

Wang Shucheng, Fu Zhongguang

机构信息

School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China.

Section of Thermal Energy, Department of Mechanical Engineering, Technical University of Denmark, Building 403, Nils Koppels Allé, 2800 Kgs. Lyngby, Denmark.

出版信息

Entropy (Basel). 2019 Apr 22;21(4):428. doi: 10.3390/e21040428.

DOI:10.3390/e21040428

PMID:33267142

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7514917/

Abstract

An integrated solar combined cycle (ISCC) with a low temperature waste heat recovery system is proposed in this paper. The combined system consists of a conventional natural gas combined cycle, organic Rankine cycle and solar fields. The performance of an organic Rankine cycle subsystem as well as the overall proposed ISCC system are analyzed using organic working fluids. Besides, parameters including the pump discharge pressure, exhaust gas temperature, thermal and exergy efficiencies, unit cost of exergy for product and annual CO-savings were considered. Results indicate that Rc318 contributes the highest exhaust gas temperature of 71.2℃, while R113 showed the lowest exhaust gas temperature of 65.89 at 800 W/m, in the proposed ISCC system. The overall plant thermal efficiency increases rapidly with solar radiation, while the exergy efficiency appears to have a downward trend. R227ea had both the largest thermal efficiency of 58.33% and exergy efficiency of 48.09% at 800W/m. In addition, for the organic Rankine cycle, the exergy destructions of the evaporator, turbine and condenser decreased with increasing solar radiation. The evaporator contributed the largest exergy destruction followed by the turbine, condenser and pump. Besides, according to the economic analysis, R227ea had the lowest production cost of 19.3 $/GJ.

摘要

本文提出了一种带有低温余热回收系统的集成太阳能联合循环（ISCC）。该联合系统由常规天然气联合循环、有机朗肯循环和太阳能场组成。使用有机工质对有机朗肯循环子系统以及整体的ISCC系统性能进行了分析。此外，还考虑了包括泵排出压力、废气温度、热效率和㶲效率、产品的㶲单位成本以及每年的CO减排量等参数。结果表明，在所提出的ISCC系统中，Rc318在800W/m²时废气温度最高，为71.2℃，而R113废气温度最低，为65.89℃。整体电厂热效率随太阳辐射迅速增加，而㶲效率则呈下降趋势。在800W/m²时，R227ea的热效率最高，为58.33%，㶲效率为48.09%。此外，对于有机朗肯循环，蒸发器、涡轮机和冷凝器的㶲损失随太阳辐射增加而减少。蒸发器的㶲损失最大，其次是涡轮机、冷凝器和泵。此外，根据经济分析，R227ea的生产成本最低，为19.3美元/GJ。