Integrated chemisorption cycles for ultra-low grade heat recovery and thermo-electric energy storage and exploitation
Integrated chemisorption cycles for ultra-low grade heat recovery and thermo-electric energy storage and exploitation
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DOI：
10.1016/j.apenergy.2015.11.052
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发表时间：
2016-02
期刊：
影响因子：
11.2
通讯作者：
Huashan Bao;Zhiwei Ma;A. Roskilly
中科院分区：
文献类型：
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作者：
Huashan Bao;Zhiwei Ma;A. Roskilly
本文研究了超低品位热驱动的集成化学吸附技术，实现电能和热能的同时储存。采用低温和高温盐的再吸收循环，以及氯化锰（MnCl 2）、氯化钙（CaCl 2）和溴化钠（NaBr）之间的耦合，在30 °C和100 °C之间的热源温度下，在所提出的集成系统中进行评估和比较。在充能过程中，引入工作流体压缩，将机械能或电能转化为化学能，以便在利用低温热能的同时，在吸附过程中将其储存。在能量释放过程中，可以通过来自低温盐反应器的解吸的高压工作蒸汽的膨胀来产生机械功率，还存在可以从冷膨胀排气中提取的冷却能量的副产品潜力。高温盐堆除可提供发电和潜在冷能外，还可通过放热吸附过程提供升级热量。从能量效率、（火用）效率和能量密度等方面讨论了这种集成循环的性能。在超低品位热量的帮助下，已经发现当热源温度分别高于50 °C和60 °C时，使用CaCl 2-NaBr和MnCl 2-CaCl 2对可以实现所提出的系统的100%的往返电力存储效率。此外，使用这两种吸附剂对，热的温度分别升高15-33 °C和22-68 °C是可能的。
The integrated chemisorption technology driven by ultra-low grade heat for simultaneous electrical power and thermal energy storage has been investigated in this work. A resorption cycle employing low and high temperature salts, with the coupling between manganese chloride (MnCl2), calcium chloride (CaCl2) and sodium bromide (NaBr), was evaluated and compared in the proposed integrated system for a heat source temperature of between 30 °C and 100 °C. During the energy charging process, working fluid compression was introduced to convert mechanical power or electricity into chemical energy so that it could be stored during the adsorption process at the same time as utilising low temperature heat energy. During the energy discharging process, mechanical power could be generated via the expansion of the desorbed high pressure working vapour from the low temperature salt reactor, there is also a by-product potential of the cooling energy which can be extracted from the cold expansion exhaust. In addition to the power generation and the potential cold energy, upgraded heat could also be provided by the exothermic adsorption process in the high temperature salt reactor. The performance of this integrated cycle in terms of energy and exergy efficiency and energy density have been discussed. With the help of ultra-low grade heat, a 100% round-trip electricity storage efficiency of the proposed system has been found to be achievable using CaCl2–NaBr and MnCl2–CaCl2pairs when the heat source temperature was higher than 50 °C and 60 °C, respectively. Also a temperature lift of the heat by 15–33 °C and 22–68 °C respectively was possible using these two adsorbent pairs.