基于输运床的内在碳捕集气化制氢反应器操作条件研究

Study on operation condition of an in-situ carbon capture gasification based on transport reactor

针对固定床或鼓泡流化床反应器的内在碳捕集气化过程中气固混合程度差的问题,本文将输运床作为内在碳捕集气化制氢反应器,建立了考虑流体动力学及反应动力学的反应器动力学模型,研究了水碳比、操作温度及操作压力对反应器运行可行性及性能的影响。结果表明,以输运床小试装置为基准,当反应器操作压力为900 kPa、反应器温度为800℃、进口水碳比为2时,反应器内碳转化率可达60%,出口气体产物(干气)中氢气的摩尔分数可达到82%。研究结果证实了基于输运床的内在碳捕集气化反应器的可行性及其在提高反应性能上的优势,指出了操作条件范围,可为内在碳捕集气化制氢技术的研究提供参考。

In order to solve the problem of low carbon conversion rate in the conventional in-situ carbon capture gasification process based on fixed bed or bubbling fluidized bed reactor,in this paper,a transport bed is applied as the reactor of the in-situ carbon capture gasification for hydrogen production.The dynamic model of the reactor combining hydrodynamic models and reaction kinetic models is built to investigate the operation feasibility and influence of key parameters,such as steam to carbon ratio,operation temperature and pressure,on reactor performance.The study concludes the operational conditions of the reactor when it has operational feasibility.Meanwhile,results show that,take a small test transport equipment as basis,the reactor is recommend to operate at pressure of 900 kPa,temperature of 800℃and steam to carbon ratio of 2.Under this condition,the H2 composition in the dry gas could reach 82%together with the carbon conversion of 60%.The results confirmed the feasibility of the transport bed as the in-situ carbon capture gasification reactor and its advantage in improving the in-situ carbon capture gasification performance,determined the ranges of reactor operation conditions,which provide a reference for the development of hydrogen production technology by in-situ carbon capture gasification.