基于LNG冷能及燃料电池余热的KCS-DORC系统优化

陈旭阳; 杨帆; 李鹏飞; 海笑; 高月; 姜文全

doi:10.19912/j.0254-0096.tynxb.2024-1143

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太阳能学报 ›› 2025, Vol. 46 ›› Issue (12) : 152-160. DOI: 10.19912/j.0254-0096.tynxb.2024-1143

基于LNG冷能及燃料电池余热的KCS-DORC系统优化

陈旭阳¹, 杨帆², 李鹏飞², 海笑², 高月², 姜文全¹

作者信息 +

OPTIMIZATION OF KCS-DORC SYSTEM BASED ON LNG COLD ENERGY AND FUEL CELL WASTE HEAT

Chen Xuyang¹, Yang Fan², Li Pengfei², Hai Xiao², Gao Yue², Jiang Wenquan¹

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文章历史 +

摘要

面向天然气燃料电池余热与液化天然气冷能的高效利用,设计整合氨水循环和双级有机朗肯的联合循环方案。通过数值模拟的计算方法,分析乙烷及其混合工质的热经济性能,同时分析汽轮机4入口压力p₁₈、R1270质量流量q_m,11和汽轮机1入口温度t₂₆对系统的影响并对系统进行优化。结果表明：在高温级有机朗肯循环中,工况2的整体性能优于工况1,在乙烷与R600质量分数为0.2、0.8时净输出功最大。增加p₁₈、q_m,11和t₂₆均有利于提升系统净输出功和热效率,增加p₁₈有利于提升系统的㶲效率,但不利于系统的经济性。Matlab优化结果为3731.72 kW、41.95%和2.751×10^-2美元/kWh。系统折旧回收期为4.94 a,冷库制冷系数为0.233。

Abstract

Aiming at the problems of waste heat recovery in solid fuel cells using natural gas as fuel and the utilization of cold energy in liquefied natural gas, a combined power cycle of ammonia-water power cycle and two-stage organic Rankine was proposed. The thermo-economic performance of hexane and its mixture was analyzed by the calculation method of numerical simulation. The effects of TUR4 inlet pressure p₁₈, R1270 mass flow rate q_m,11 and TUR1 inlet temperature t₂₆ on system was also analyzed, followed by system optimization. The results show that the overall performance of Case 2 is superior to Case 1 in the high-temperature grade organic Rankine cycle, and the net output power is maximum at hexane/R600 mass fraction of （0.2/0.8）. Increasing p₁₈, q_m,11 and t₂₆ enhances net power output and thermal efficiency, while elevating p₁₈ improves exergy efficiency but compromises economic performance. Matlab optimization results are 3731.72 kW, 41.95% and 2.751×10^-2 $/kWh. The system depreciation payback period and cold storage cooling factor are 4.94 years and 0.233 respectively.

导出引用

陈旭阳, 杨帆, 李鹏飞, 海笑, 高月, 姜文全. 基于LNG冷能及燃料电池余热的KCS-DORC系统优化[J]. 太阳能学报. 2025, 46(12): 152-160 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1143

Chen Xuyang, Yang Fan, Li Pengfei, Hai Xiao, Gao Yue, Jiang Wenquan. OPTIMIZATION OF KCS-DORC SYSTEM BASED ON LNG COLD ENERGY AND FUEL CELL WASTE HEAT[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 152-160 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1143

中图分类号： TK123

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