Thermodynamic analysis of chemical looping coupling process for coproducing syngas and hydrogen with in situ CO2 utilization
Thermodynamic analysis of chemical looping coupling process for coproducing syngas and hydrogen with in situ CO2 utilization
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DOI：
10.1016/j.enconman.2021.113845
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发表时间：
2021-03
影响因子：
10.4
通讯作者：
Qian Yang;M. Yan;Leiyu Zhang;X. Xue;Yanyan Zhu;Chundong Zhang;Binran Zhao;Xiaoxun Ma;Xiaodong Wang
中科院分区：
文献类型：
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作者：
Qian Yang;M. Yan;Leiyu Zhang;X. Xue;Yanyan Zhu;Chundong Zhang;Binran Zhao;Xiaoxun Ma;Xiaodong Wang
本研究提出了一种新型的化学链耦合系统，用于原位利用CO2联产合成气和氢气。它以甲烷为燃料，氧化铁为载氧体，集化学链燃烧、化学链重整、CO2-H2O共裂解、制氢和空气氧化于一体。在这个过程中，合成气和H2纯化，除了CO2捕获和存储不再是必要的。它不仅生产高纯度氢气和合成气，没有污染物和温室气体排放，而且实现了原料和氧载体的充分利用。采用白杨Plus对化学链耦合工艺进行了详细的热力学分析。从甲烷利用率、合成气和氢气的收率和纯度以及氧载体耦合等方面考察了各反应器的进料比、温度和压力等关键参数对工艺性能的影响。此外，还对具有换热网络的耦合系统进行了能量平衡分析。根据所建立的过程模型，得出燃烧、重整、共裂解、水蒸气和空气反应器的较佳进料比分别为4、1、0.4、1.1和1.5。上述五个反应器中的优选温度依次为900、900、850、500和500 °C，并且每个反应器中的优选压力为1个大气压。在此条件下，可以得到纯度为100%的氢气和纯度为99%和93%的合成气，且H2/CO比为2左右。该耦合系统的能量效率和火用效率分别达到90.54%和72.04%。
This study proposed a novel chemical looping coupling system for coproducing syngas and hydrogen with in situ CO2utilization. It integrates chemical looping combustion, chemical looping reforming, CO2-H2O co-splitting, hydrogen production and air oxidation using CH4as fuel and iron oxide as oxygen carrier. In this process, syngas and H2purification, in addition to CO2capture and storage are no longer necessary. It not only produces high-purity hydrogen and syngas without pollutants and greenhouse gas emissions, but realizes the sufficient utilization of feed and oxygen carriers. A detailed thermodynamic analysis of the proposed chemical looping coupling process was conducted by Aspen Plus. The effects of key parameters, such as feed ratio, temperature, and pressure in each reactor on the process performance were investigated in terms of the utilization of CH4, the yield and purity of syngas and hydrogen, and the oxygen carrier coupling. In addition, the energy balance was analyzed for the coupling system with heat exchanger network. Based on the established process model, we concluded that the preferable feed ratios in combustion, reforming, co-splitting, steam and air reactors were 4, 1, 0.4, 1.1 and 1.5, respectively. The preferable temperatures in the five reactors mentioned above were 900, 900, 850, 500 and 500 °C in sequence, and the preferable pressure was 1 atm in each reactor. Under these conditions, high-purity hydrogen (100%) and syngas (99% and 93% purity) with ideal H2/CO ratio (~2) could be obtained. The energy efficiency and exergy efficiency of this coupling system reached up to 90.54% and 72.04%, respectively.