High-temperature carbonate/MgO composite materials as thermal storage media for double-walled solar reformer tubes
High-temperature carbonate/MgO composite materials as thermal storage media for double-walled solar reformer tubes
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DOI：
10.1016/j.solener.2008.05.011
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发表时间：
2008-12
期刊：
影响因子：
6.7
通讯作者：
N. Gokon;D. Nakano;Shin-ichi Inuta;T. Kodama
中科院分区：
文献类型：
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作者：
N. Gokon;D. Nakano;Shin-ichi Inuta;T. Kodama
利用实验室规模的双壁反应管，在管式重整装置中考察了熔融碱式碳酸盐/氧化镁陶瓷复合材料作为储热介质。双壁转化器管的概念被提出为太阳能管式重整器，涉及在催化器管内和太阳能吸收器壁外部之间的环形区域填充熔盐/陶瓷复合材料。试验了Na2CO3、K2CO3、Li2CO3与氧化镁的复合材料作为储热介质。在双壁反应堆管冷却模式下，对复合材料的重整性能进行了测试。在原料气为CH4/CO2=1：3、温度为1atm时的实验结果表明，加入80wt%Na2CO3/20wt%MgO复合材料后，催化剂床层冷却时间比未加复合材料时延长了5~19min。此外，Li_2CO_3/Mg_3和Na_2CO_3/Mg_2O_3复合材料表现出了较好的性能：在5,000-12,500h−-1的空速范围内，冷却时间延长了10min以上。将该反应器管应用于太阳能管式重整器中，有望实现太阳重整过程在云通过期间的脉动日照下的稳定运行。
The composite materials of molten alkali-carbonate/MgO-ceramics are examined as thermal storage media in a tubular reformer using a double-walled reactor tube of a laboratory scale. The concept of a double-walled reformer tube is proposed as a solar tubular reformer and involves packing a molten salt/ceramic composite material in the annular region between the internal catalyst tube and the exterior solar absorber wall. The composite materials of Na2CO3, K2CO3, and Li2CO3with magnesia are tested as thermal storage media. The reforming performances of the composite materials are tested in the cooling mode of the double-walled reactor tube. The experimental result obtained under feed gas mixture of CH4/CO2=1:3 at 1atm shows that the use of 80wt%Na2CO3/20wt%MgO composite material successfully delayed the cooling time of the catalyst bed by 5–19min in comparison to the case without a composite material. In addition, the Li2CO3/MgO and Na2CO3/MgO composite materials relatively revealed good performances: they prolonged the cooling time by over 10min in the gas hourly space velocity (GHSV) range of 5000–12,500h−1. The application of the reactor tubes to solar tubular reformers is expected to realize stable operation of the solar reforming process under fluctuating insolation during cloud passage.