Effect of regenerator on the direct steam generation solar power system characterized by prolonged thermal storage and stable power conversion

RENEWABLE ENERGY

卷:159

Article

Li, Pengcheng^1,3  Cao, Qing⁴  Li, Jing²  Wang, Yandong⁵  Pei, Gang⁶  Gao, Cai¹  Zhao, Hongling¹  Liu, Xunfen¹ 

[1] Hefei Univ Technol, Sch Automobile & Traff Engn, 193 Tunxi Rd, Hefei, Anhui, Peoples R China

[2] Univ Hull, Res Ctr Sustainable Energy Technol, Energy & Environm Inst, Kingston Upon Hull HU6 7RX, N Humberside, England

[3] Y&C ENGINE CO LTD, 2 Eqiao Rd, Sanshan, Wuhu, Peoples R China

[4] Hefei Univ Technol, Sch Mech Engn, 193 Tunxi Rd, Hefei, Anhui, Peoples R China

[5] Hefei Gen Machinery Res Inst, 888 Changjiang Rd, Hefei, Anhui, Peoples R China

[6] Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, 96 Jinzhai Rd, Hefei, Anhui, Peoples R China

关键词: Regenerator;    Direct steam generation;    Heat exchanger area;    Heat storage capacity;    Net profit;   

DOI  :  10.1016/j.renene.2020.06.037

来源: Elsevier

【 摘 要 】

The direct steam generation (DSG) solar power system using two stage accumulators and cascade steam-organic Rankine cycle (RC-ORC) has remarkably enlarged storage capacity. It can facilitate stable power generation and address the challenges of conventional DSG systems. Regenerator is generally an issue worthy of discussion in organic Rankine cycle (ORC) systems. However, its influence on the newly proposed DSG system has not been investigated yet and is expected to be appreciable. Introducing a regenerator affects not only the ORC efficiency, RC-ORC efficiency, heat exchanger area, but also heat storage capacity, discharge duration, discharge efficiency, aperture area of collectors and the net profit (DP). Detailed performance comparison between the DSG systems without/with regenerator is carried out in this paper. The results indicate that at a given power output, aperture area is reduced by the regenerator especially for MM, R365mfc and pentane due to the increment in ORC, RC-ORC and discharge efficiencies, as well as the decrement in heat input. Discharge duration is shortened by 0.01-1.78 h depending on ORC fluids. R365mfc exhibits the maximum Delta P (4.19 similar to 6.48 million USD), followed by MM and pentane. On the contrary, Delta P is negative for benzene (-5.61 similar to 4.31 million USD). (c) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free