Enhanced hydrogen production process from coal integrated with CO2 separation using dual chemical looping
Enhanced hydrogen production process from coal integrated with CO2 separation using dual chemical looping
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DOI：
10.1016/j.egypro.2011.01.058
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T. Nakagaki
中科院分区：
文献类型：
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作者：
T. Nakagaki
本文介绍了一种先进的CO2分离制氢系统，该系统以HyPr-RING为基础，通过双化学链强化。第一个化学循环是使用正硅酸锂（Li 4SiO 4）作为固体CO2吸附剂进行CO2分离，该固体CO2吸附剂可以在650 °C左右通过放热反应吸收CO2，并在800 °C左右再生。通过金属氧化物的氧化还原反应的另一化学循环被应用于气化反应器中的氧载体和热源以再生吸附剂。氧化铜（CuO）被碳还原是放热反应，有利于能量平衡，而氧化镍或赤铁矿被碳还原是吸热反应，因此CuO是一种合适的氧载体材料。将氧化铜和石墨以不同比例和不同筛孔尺寸的干燥混合物滴入在不同温度下预热的反应器中，用气体计和GC/TCD定量产物气体的各组分。即使在吸收CO2的温度附近，也证实了石墨的制氢，但在任何测试条件下，CuO和石墨的简单混合物主要通过完全氧化产生CO2。
An advanced hydrogen production system with CO2separation is introduced in this paper, which is based on HyPr-RING and enhanced by dual chemical looping. The first chemical looping is for CO2separation using lithium ortho-silicate (Li4SiO4) as a solid CO2sorbent which can absorb CO2around 650 °C with an exothermic reaction and regenerate around 800 °C. Another chemical looping by red-ox reaction of a metal oxide is applied to oxygen carrier in the gasification reactor and heat source to regenerate the sorbent. Copper oxide (CuO) is one of the suitable materials for oxygen carrier because reduction of CuO by carbon is exothermic reaction which benefits energy balance, while reduction of nickel oxide or hematite by carbon is endothermic reaction. Dry mixtures of copper oxide and graphite in various ratio and sieve mesh size were dropped into the reactor preheated at various temperatures and each component of product gas was quantified by gas meter and GC/TCD. Hydrogen production from graphite was confirmed even at around temperature of CO2absorption, but in any test conditions, a simple mixture of CuO and graphite mainly produced CO2by complete oxidation.