This study proposed a novel chemical looping coupling system for coproducing syngas and hydrogen with in situ CO₂ utilization. It integrates chemical looping combustion, chemical looping reforming, CO₂-H₂O co-splitting, hydrogen production and air oxidation using CH₄ as fuel and iron oxide as oxygen carrier. In this process, syngas and H₂ purification, in addition to CO₂ capture 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.

这项研究提出了一种新颖的化学环偶联系统，用于在原位利用CO ₂联产合成气和氢气。它以CH ₄为燃料，氧化铁为氧气载体，集化学循环燃烧，化学循环重整，CO ₂ -H ₂ O共分解，制氢和空气氧化于一体。在此过程中，除了CO ₂之外，还需要合成气和H ₂净化不再需要捕获和存储。它不仅产生高纯度的氢气和合成气，而且没有污染物和温室气体排放，而且实现了饲料和氧气载体的充分利用。Aspen Plus对拟议的化学环偶联过程进行了详细的热力学分析。根据CH ₄的利用，研究了关键参数（如进料比，温度和每个反应器中的压力）对工艺性能的影响。，合成气和氢气的产率和纯度，以及氧载体的耦合。此外，还分析了带有热交换器网络的耦合系统的能量平衡。根据建立的过程模型，我们得出结论，燃烧，重整，共裂，蒸汽和空气反应器中的最佳进料比分别为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℃，并且每个反应器中的优选压力为1atm。在这些条件下，可以获得具有理想H ₂ / CO比（〜2）的高纯度氢气（100％）和合成气（纯度分别为99％和93％）。该耦合系统的能效和火用效率分别达到90.54％和72.04％。