Theoretical analysis and comparison on supercritical CO2 based combined cycles for waste heat recovery of engine

被引：71
|
作者：
Pan, Mingzhang [1 ]
Zhu, Yan [1 ]
Bian, Xingyan [1 ]
Liang, Youcai [2 ]
Lu, Fulu [1 ]
Ban, Zhibo [3 ]
机构：
[1] Guangxi Univ, Sch Mech Engn, Guangxi Key Lab Mfg Syst & Adv Mfg Technol, Nanning 530004, Peoples R China
[2] South China Univ Technol, Sch Elect Power Engn, Guangzhou 510640, Peoples R China
[3] Guangxi Yuchai Machinery CO Ltd, Res & Engn Inst, Adv Technol Ctr, Yulin, Peoples R China
来源：
ENERGY CONVERSION AND MANAGEMENT | 2020年 / 219卷
关键词：
Waste heat recovery; Organic Rankine cycle; Supercritical CO2 Brayton cycle; Dual-fuel engine; DIOXIDE BRAYTON CYCLE; PERFORMANCE ANALYSIS; WORKING FLUID; POWER CYCLES; S-CO2; CYCLE; OPTIMIZATION; EXERGY; ORC; TEMPERATURE; COMBUSTION;
D O I：
10.1016/j.enconman.2020.113049
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Supercritical carbon dioxide cascade waste heat recovery has proven to be a promising alternative for energy conversion applications. In this paper, four different CO2 Brayton-based dual-loop cycles are integrated to the dual-fuel engine respectively to recover the engine waste heat, including regenerative supercritical CO2 Brayton cycle/organic Rankine cycle (RSCBC/ORC), regenerative supercritical CO2 Brayton cycle/supercritical CO2 Brayton cycle (RSCBC/SCBC), supercritical CO2 recompression Brayton cycle/organic Rankine cycle (SCRBC/ORC), and supercritical CO2 recompression Brayton cycle/supercritical CO2 Brayton cycle (SCRBC/SCBC). Comprehensive parametric analysis and comparison were carried out. When the engine was operated at 1100 rpm and cycle fuel injection quantity of 14.1 mg, the SCRBC/ORC combined system presents the best performance when cyclohexane is used as the working fluid for the ORC, followed by the RSCBC/ORC, RSCBC/SCBC, and SCRBC/SCBC. The energy efficiency of the whole system is increased by 7.03% with the SCRBC/ORC, compared with the condition that engine without waste heat recovery.
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页数：19
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