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<p>This study aims to maximize cold energy utilization during liquefied natural gas (LNG) regasification and enhance system energy efficiency. A two-stage organic Rankine cycle (ORC) system was simulated in Aspen HYSYS software, with synergistic optimization of the four-component working fluid (R50/R170/R290/R600a) composition and key operating parameters (evaporation/condensation pressures). Thermodynamic and economic performance of four schemes were compared: baseline case, two HYSYS-optimized cases and genetic algorithm (GA)-optimized case. The results show that heat exchangers dominated exergy destruction (baseline case: 75.62%, HYSYS-optimized (three-component) case: 56.88%, HYSYS-optimized (four-component) case: 55.10%, GA-optimized case: 62.88%), demonstrating that the working fluid optimization significantly improves heat transfer matching of heat exchangers. In the GA-optimized case, the net power generation of two-stage ORC system can reach 154.56&#xa0;kW, with an exergy efficiency of 37%. Additionally, the system exhibits good economic feasibility, with a levelized energy cost (<i>LEC</i>) of 0.08 $/kWh and a payback period (<i>PBP</i>) of 5.95&#xa0;years.</p>

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Simulation and Optimization Research of a Two-Stage Organic Rankine Cycle System Based on LNG Cold Energy Recovery

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Dan Jiao,
  • Zhang Zheng,
  • Ziqiang Lv

摘要

This study aims to maximize cold energy utilization during liquefied natural gas (LNG) regasification and enhance system energy efficiency. A two-stage organic Rankine cycle (ORC) system was simulated in Aspen HYSYS software, with synergistic optimization of the four-component working fluid (R50/R170/R290/R600a) composition and key operating parameters (evaporation/condensation pressures). Thermodynamic and economic performance of four schemes were compared: baseline case, two HYSYS-optimized cases and genetic algorithm (GA)-optimized case. The results show that heat exchangers dominated exergy destruction (baseline case: 75.62%, HYSYS-optimized (three-component) case: 56.88%, HYSYS-optimized (four-component) case: 55.10%, GA-optimized case: 62.88%), demonstrating that the working fluid optimization significantly improves heat transfer matching of heat exchangers. In the GA-optimized case, the net power generation of two-stage ORC system can reach 154.56 kW, with an exergy efficiency of 37%. Additionally, the system exhibits good economic feasibility, with a levelized energy cost (LEC) of 0.08 $/kWh and a payback period (PBP) of 5.95 years.