电气化LNG蒸汽重整制氢系统集成与优化

Integration and optimization of electrified LNG steam reforming hydrogen production system

全球对清洁氢能需求与日俱增,甲烷蒸汽重整工艺因排放高而无法满足未来社会对清洁氢能的需求,可再生能源电解水技术高成本、低效率限制了其发展。针对上述问题,将可再生电能加热引入甲烷蒸汽重整工艺,同时高效集成碳捕集工艺与LNG冷能回收系统,提出电气化LNG蒸汽重整制氢系统。建立电气化LNG蒸汽重整制氢系统模型并进行热力学性能分析,分析重整反应温度、反应水碳比等关键参数对系统效率、电效率的影响。研究表明:新型制氢系统的效率、电效率分别高达83.2%、89.5%,电效率相比主流电解水制氢效率提升至少12.31%。新型制氢系统可实现高效、清洁的氢能供应,为实现可再生电能制氢提供新思路与新方法。

The global demand for clean hydrogen energy is constantly increasing.However,the methane steam reforming process cannot satisfy the future social demand for clean hydrogen energy due to its high emission,while the development of water electrolysis technology via renewable energy is limited due to the high cost and the low efficiency.In response to the above issues,an electrified LNG steam reforming hydrogen production system was proposed by introducing the renewable electric heating into the methane steam reforming process,which efficiently integrates the carbon capture technology and the LNG cold energy recovery system.Meanwhile,a model of the electrified LNG steam reforming hydrogen production system was established,and its thermodynamic performance was analyzed.On this basis,investigation was conducted on the influence of the reforming temperature,water-to-carbon ratio and other key parameters on the exergy efficiency and electrical efficiency of the system.The research shows that the exergy efficiency and electrical efficiency of the novel hydrogen production system are as high as 83.2%and 89.5%respectively,and the electrical efficiency is 12.3%higher than the mainstream water electrolysis hydrogen production system.Generally,the novel hydrogen production system could achieve an efficient and clean hydrogen energy supply,providing a new idea and solution to achieve hydrogen production by renewable electricity.