Theoretical analysis and comparison on supercritical CO2 based combined cycles for waste heat recovery of engine
2020
Pan, Mingzhang | Zhu, Yan | Bian, Xingyan | Liang, Youcai | Lu, Fulu | Ban, Zhibo
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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