Abstract: Chemical looping air separation (CLAS), which used Mn2O3/Mn3O4 as oxygen carriers, was conducted as an alternative of the conventional air separation technology. Herein, a new technique which integrated biomass gasification system with CLAS for hydrogen production was presented. Aspen Plus software combined with Fortran programing was employed to study this new system. The effects of three vital variables, including steam-to-biomass mass ratio (S/B), oxygen-to-biomass mass ratio (O/B) and steam-to-Mn2O3 molar ratio (S/M), on system performances were analyzed. The results were showed below: the mole fraction of syngas was easily affected by S/B. In term of the hydrogen yield (YH2) and thermodynamic efficiencies, they were slightly affected by S/B. As for O/B, it had a great influence on the system performance indicators. Moreover, with the increase of S/M, the temperature of reduction reactor was dropped and the remain system performances indicators were insensitive to variation of S/M. Additionally, thermodynamic performances of the researched system were evaluated. The results showed that the values of S/B, O/B and S/M were 0.12, 0.25 and 0.1, respectively, the total energy efficiency was 74.18% and exergy efficiency was 65.64%. Compared with traditional biomass gasification process, the exergy efficiency of this novel system was improved 8.62%.

Key words: biomass gasification, chemical looping air separation, hydrogen production, Aspen Plus, thermodynamic analysis

摘要： 以Mn2O3/Mn3O4为氧载体，结合化学链制氧技术，建立了生物质氧气?水蒸气气化产氢工艺，并用Aspen Plus软件进行工艺模拟，研究了水蒸气/生物质质量比(S/B)、氧气/生物质质量比(O/B)和水蒸气/氧载体摩尔比(S/M)对系统性能指标(合成气组成、冷煤气效率、氢气收率、能量效率和?效率等)的影响. 结果表明，S/B对冷煤气效率、氢气收率、能量效率和?效率影响不明显，对合成气组成影响较大，O/B对系统性能指标均有较大影响，S/M只对还原反应器温度有较大影响；当S/B, O/B和S/M分别为0.12, 0.25和0.1时，系统总效率和?效率分别为74.18%和65.42%，与传统工艺相比，?效率提高了8.62%.

关键词: 生物质气化, 化学链制氧, 产氢, Aspen Plus, 热力学分析