化学链高温空分制氧性能评价

Performance evaluation of chemical looping air separation/oxygen production at high temperatures

采用Aspen Plus软件对高温空分制氧流程进行模拟研究并做出评价.基于热力学平衡原理,对不同金属氧化物载体(Mn3O4-Mn2O3和CoO-Co3O4)、不同反应温度下的平衡氧分压进行计算,得到了Mn3O4-Mn2O3和CoO-Co3O4体系氧平衡分压与温度的关系;在计算平衡氧分压的基础上,确定了制氧所需的空气量与水量/CO2量;构建了制氧流程,并进行了模拟计算.结果表明,在2种载氧体Mn3O4-Mn2O3和CoO-Co3O4中,载氧体Mn3O4-Mn2O3制氧性能较好;化学链高温空分制取纯氧能耗为0.353 kW.h/kg,与传统制氧能耗经验数据0.246 kW.h/kg相比并不具有明显的优势;化学链高温空分制取O2和CO2混合气体能耗为0.151 kW.h/kg(氧气体积分数为14.3%),与传统制氧能耗经验数据0.246 kW.h/kg相比,具有节能潜力.

With the Aspen Plus software,simulations and evaluations of chemical looping air separation（CLAS） process w ere performed.Based on chemical reaction equilibrium principle,equilibrium partial pressures of oxygen under different conditions for the redox of CoO-Co3O4 and Mn3O4Mn2O3 w ere calculated.The relations betw een equilibrium partial pressures of oxygen and operation temperatures w ere obtained.According to the equilibrium partial pressures of oxygen,the required air flow and steam/CO2 flow for the production of oxygen w ere determined.Finally,energy consumptions of oxygen production w ere calculated.The results show that compared w ith CoO-Co3O4,Mn3O4-Mn2O3 oxide system it is more effective.The energy consumption of CLAS by steam is about 0.353 kW·h/kg of oxygen produced w hile in conventional cryogenic air-separation system it is about 0.246 kW·h/kg.The energy consumption of CLAS by CO2 is about 0.151 kW·h/kg（φ（O2） =14.3%）.Therefore the performance of CLAS by CO2 takes advantages of energy-saving.