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集成太阳能热化学过程的混合动力系统

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提出太阳能热驱动甲醇裂解反应制取合成气，联合高温固体氧化物燃料电池-均质压燃内燃机的清洁高效低碳热力系统。结果表明，在设计工况下，热化学效率63％，混合动力发电效率48。7％，太阳能净发电效率30。7％，系统的㶲效率为40。25％。不可逆损失分布由大到小依次为内燃机，燃料电池空气预热器，太阳能热化学过程，排烟损失，高温固体氧化物燃料电池，甲醇预热器和内燃机空气预热器。相较于传统混合动力系统，太阳能热化学过程转移了固体氧化物燃料电池的部分不可逆损失。太阳能辐照强度从300 W/m2增加至800 W/m2，热化学效率从52％升高至63％，太阳能净发电效率由25。3％增长至30。7％。燃料利用率从0。5增加至0。85时，内燃机功率输出占比不断减小至15。6％，混合动力单元的发电效率从45％增加至 50％。
Thermodynamics Analysis on Combined Thermochemical of Solar Energy and Hybrid power System
A novel integrated system has been proposed combining intermediate-temperature ther-mochemical solar energy conversion with a Hybrid Solid Oxide Fuel Cell-Internal Combustion Engine(SOFC-ICE)system.Methanol serves as an alternative fuel.It undergoes cracking to syngas within the solar collector operating at temperatures ranging from 250℃ to 300℃,subsequently supplying power plants for electricity generation.Mathematical models were developed for the 0-D simula-tion of the thermochemical reaction unit,solid oxide fuel cell unit,and homogeneous compression charge ignition engine unit.The design analysis revealed impressive efficiencies:the solar-to-chemical efficiency reached 72.9％,and the hybrid SOFC-ICE system demonstrated the power and exergy ef-ficiency of 48.7％and 40.25％,respectively.The overall solar-to-chemical-to-power efficiency was found to be 30.7％.Irreversibility within the components followed a descending order:the internal combustion engine,SOFC air preheater,solar-to-chemical process,exhaust loss,solid oxide fuel cell power generation,methanol preheater,and engine air preheater.Compared with the traditional hy-brid SOFC-ICE system,the thermochemical unit mitigates exergy losses associated with the external reformer.Furthermore,with increasing solar irradiance from 300 W·m-2 to 800 W·m-2,the solar-to-chemical efficiency rose from 52％to 63％,and the solar-to-chemical-to-power efficiency increased from 25.3％to 30.7％.As fuel utilization increased from 0.5 to 0.85,the engine power output ratio reduced to 15.6％,resulting in a notable enhancement of the power efficiency of hybrid system from 45％to 50％.

solid oxide fuel cell-homogeneous charge compression ignition enginethermochemical of solar energymethanolexergy analysisfuel utilization factor

李艺敏、韩东江、隋军

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中国科学院工程热物理研究所,北京 100190

中国科学院大学,北京 100049

东莞新能源研究院,东莞 523808

固体氧化物燃料电池-均质压燃内燃机 太阳能热化学 甲醇 㶲分析 燃料利用率

国家重点研发计划中科院青年促进会项目东莞新能源研究院重点部署项目

2021YFF050070120211412022-YJ-0001

2024

工程热物理学报
中国工程热物理学会 中国科学院工程热物理研究所

工程热物理学报

CSTPCD北大核心
影响因子：0.4
ISSN：0253-231X
年,卷(期)：2024.45(8)
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