液化天然气冷能和核工业余热利用的联合动力循环

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中图分类号：TE09 文献标志码：A DOI：10.3969/j.issn.1003-9015.2025.04.012

文章编号：1003-9015（2025）04-0692-08

Abstract： In order to investigate thecold energyof liquefied natural gas（LNG）andnuclear industrial waste heat effcient utilization，two-stage tandem cycle system （TTC）and two-stage parallel cycle system （TPC） were established.Efects of condensation temperature and LNG vaporization pressre on system performance were analyzed.Six working fluids were selected as candidates，with theobjective function of maximizing net power output，genetic algorithm was utilized to optimize the system parameters.Theresults show thatthere exists afirst-stage and second-stage condensation temperature making the performance of the TTC and TPC system optimal. The optimal working fluids for TTC and TPC systems are C2H6+C2H4F2 and C2H4F2+i-C4H10 ，respectively. In optimal conditions，the TTC system demonstrates higher net output power，thermal efciencyand exergy efficiency，while the TPC system required heat exchange area has significantly increased，which may have an impact on system economy.

Key words： LNG cold energy power generation；nuclear industry waste heat； genetic algorithm optimization; Organic Rankine Cycle

1前言

在全球能源转型与环保背景下，液化天然气（LNG）冷能与核工业余热具有巨大的回收利用潜力，LNG汽化过程中会释放大量冷能（约为 830kJ⋅kg-1 ）[1-2]，核工业余热主要来源于核反应堆的冷却系统、辅助设备以及放射性废物处理过程，具有供应稳定性高、受自然条件约束少等特点[3-5]。（剩余10916字）