Investigation of hydrogen production using chemical looping reforming
Investigation of hydrogen production using chemical looping reforming
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DOI：
10.1016/j.egypro.2014.12.069
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Mohammed N. Khan;T. Shamim
中科院分区：
文献类型：
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作者：
Mohammed N. Khan;T. Shamim
化学循环重整(CLR)是一种较新的制氢方法，用于将固体燃料、液体燃料或气态燃料转化为能源。该方法具有固有的CO2捕集、最小的NOx排放和产氢等诸多优点。在这个过程中，燃料和氧化剂之间没有直接接触。这种方法利用氧载体中的氧，氧载体可以是用于燃烧或通过还原水制造氢气的金属氧化物。这个想法是通过使用三个独立的反应堆将燃烧过程分为三个单独的子过程：空气反应器，其中氧气载体被空气氧化；燃料反应器，天然气被氧化以产生二氧化碳和H2O流；以及蒸汽反应器，蒸汽被还原以产生氢气。在本研究中，利用Aspen Plus建立了以氧化铁为氧载体的热力学模型，利用质量守恒和能量守恒对CLR系统的所有组件进行了计算。利用所建立的模型考察了各种操作参数如空气、燃料、蒸汽和氧气载体(OC)的质量流量对氢气产量和关键反应器温度的影响。结果表明，蒸汽流量和氧化物流量的增加会降低氢气的生成量，而燃料流量的增加会增加氢气的生成量。
Chemical looping reforming (CLR) is a relatively new method to produce hydrogen and is used to convert solid, liquid or gaseous fuels to energy. There are various advantages of this method such as inherent CO2capture, minimal NOx emissions and the hydrogen production. In this process, there is no direct contact between the fuel and oxidizer. This method utilizes oxygen from the oxygen carrier which may be a metal oxide for combustion or for making hydrogen by reducing water. The idea is to split the combustion process into three separate sub-processes by employing three separate reactors: air reactor where the oxygen carrier is oxidized by air, fuel reactor where natural gas is oxidized to produce a stream of CO2and H2O and steam reactor where the steam is reduced to produce hydrogen. In this study, a thermodynamic model with iron oxides as oxygen carrier has been developed using Aspen Plus by employing conservation of mass and energy for all the components of the CLR system. The developed model was employed to investigate the effect of various operating parameters such as mass flow rates of air, fuel, steam and oxygen carrier (OC) on hydrogen production and key reactor temperatures. The results show that increase in steam and oxide flow rates decreases the H2production whereas the increase in fuel flow rate increases the H2production.