A mid/low-temperature solar-driven integrated membrane reactor for the dehydrogenation of propane - A thermodynamic assessment
A mid/low-temperature solar-driven integrated membrane reactor for the dehydrogenation of propane - A thermodynamic assessment
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用于丙烷脱氢的中低温太阳能驱动集成膜反应器 — 热力学评估
DOI：
10.1016/j.applthermaleng.2021.116952
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发表时间：
2021-04-29
影响因子：
6.4
通讯作者：
Li, Wenjia
中科院分区：
文献类型：
--
作者：
He, Rongjie;Wang, Yipu;Li, Wenjia
太阳能热化学转化是一种有效的太阳能储能方法，丙烷脱氢是目前流行的丙烯和氢气生成技术，但反应所需的高温限制了其效率和利用率。本研究提出了一种太阳能驱动丙烷脱氢透氢膜反应器系统，在温和的温度范围内高效生成纯氢和丙烯，减少了热损失，提高了转化率，从而将低品位的太阳能热能转化为高品位的化学能。采用数值模拟的方法，分析了该体系在不同温度（250 ~ 500℃）和H-2渗透压力(10（-5)~ 10(-2)bar）下的热力学、动力学和环境性能。在400℃，10(-5)bar条件下，C3H8转化率、C3H6选择性和C3H6产率分别达到99.2%、99.1%和98.3%。计算出该系统的第一定律热力学效率、太阳能-燃料效率和火用效率分别为93.1%、33.6%和73.4%（400℃，10(-4)bar）。年节约标准煤和减少二氧化碳的比率为279.8公斤/立方米。年)和685.5 kg/(m(2)。（400摄氏度，10（-5）巴）。本研究验证了太阳能集热器与膜反应器集成用于C3H8脱氢高效太阳能存储的可行性，为进一步的实验研究提供了指导。
Solar thermochemical conversion is an effective method for solar energy storage, and propane dehydrogenation is one popular technology to generate propylene and hydrogen, while the high temperature required in the reaction limits its efficiency and utilization. In this research, a solar-driven hydrogen permeation membrane reactor system for propane dehydrogenation is proposed for efficiently generating pure hydrogen and propylene in a mild temperature range, which can decrease the heat loss and increase the conversion rate, thereby converting low-grade solar thermal energy into high-grade chemical energy. Using the method of numerical simulation, the thermodynamic, kinetic, and environmental performances of the system are analyzed at different temperatures (250-500 degrees C) and H-2 permeate pressures (10(-5)-10(-2) bar). The C3H8 conversion rate, C3H6 selectivity, and C3H6 yield can achieve 99.2%, 99.1%, and 98.3% at 400 degrees C, 10(-5) bar with the assistance of hydrogen separation. The first-law thermodynamic efficiency, solar-to-fuel efficiency, and exergy efficiency of the system are calculated to be 93.1%, 33.6%, and 73.4% (400 degrees C, 10(-4) bar), respectively. The annual standard coal savings and carbon dioxide reduction rates are calculated to be 279.8 kg/(m(2).year) and 685.5 kg/(m(2).year) (400 degrees C, 10(-5) bar). This study demonstrates the feasibility of a solar collector integrated with a membrane reactor for efficient solar energy storage via C3H8 dehydrogenation and provides guidance for further experimental research.