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Hydrogen production through chemical looping and sorption-enhanced reforming of olive mill wastewater: Thermodynamic and energy efficiency analysis
Energy Conversion and Management ( IF 10.4 ) Pub Date : 2021-04-24 , DOI: 10.1016/j.enconman.2021.114146
Pedro Cerqueira , M.A. Soria , Luis M. Madeira

A thermodynamic study was performed aiming to compare the performance of different reactor configurations, namely traditional (TR), sorption-enhanced (SER), chemical looping (CLR) and chemical-looping sorption-enhanced reforming (SE-CLR) for the steam reforming of olive mill wastewater (OMW), a byproduct of olive oil production, to produce green hydrogen. This analysis was accompanied by an energy balance in order to maximize energy efficiency and achieve autothermal operating conditions. The parameters assessed in the thermodynamic study were temperature (250–900 °C) and steam-to-carbon molar ratio (0.15–3.0), but also, for the sorption-enhanced process, the ratio between the CO2 sorbent and the OMW (0–8.0), and for the chemical looping process the ratio between the oxygen carrier and the OMW (0–6.0). The SER showed higher hydrogen yield for the range of conditions tested than both the traditional and chemical looping reformers, with a hydrogen purity above 99%. By combining sorption-enhanced with chemical looping reforming, an H2 purity above 99% and a yield higher than that for chemical looping by itself were observed. For the CLR and SE-CLR configurations, a system in which the energy released is higher than the required was achieved by varying the amount of oxygen carrier, enabling operating under autothermal conditions. A pinch analysis was performed for the CLR and the SE-CLR to quantify the possible heat integration in a realistic system. It was found that CLR can be 71% self-sufficient, whilst SE-CLR can be 55% self-sufficient.



中文翻译:

通过化学循环和吸附强化重整制橄榄厂废水制氢:热力学和能效分析

进行了热力学研究,目的是比较用于蒸汽重整的不同反应器配置的性能,即传统(TR),吸附增强(SER),化学回路(CLR)和化学回路吸附增强重整(SE-CLR)橄榄油生产的副产品橄榄磨坊废水(OMW)产生绿色氢气。该分析伴随着能量平衡,以最大程度地提高能源效率并实现自热运行条件。在热力学研究中评估的参数是温度(250–900°C)和蒸汽与碳的摩尔比(0.15–3.0),但是对于吸附增强过程,CO 2之间的比率吸附剂和OMW(0–8.0),对于化学循环过程,氧气载体和OMW之间的比率(0–6.0)。SER显示,在所测试的条件范围内,比传统的和化学回路重整器都具有更高的氢产率,氢纯度高于99%。通过结合吸附增强和化学环重整,H 2观察到其纯度高于99%,且收率高于化学成环法本身的收率。对于CLR和SE-CLR配置,通过改变氧气载流子的数量来实现释放能量高于所需能量的系统,从而可以在自热条件下运行。对CLR和SE-CLR进行了夹点分析,以量化实际系统中可能的热量整合。发现CLR可以自给71%,而SE-CLR可以自给55%。

更新日期:2021-04-24
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