An enhanced adsorption cycle operated by periodic reversal forced convection
An enhanced adsorption cycle operated by periodic reversal forced convection
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DOI：
10.1016/s1359-4311(99)00036-8
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发表时间：
2000-05
影响因子：
6.4
通讯作者：
Haiming Lai
中科院分区：
文献类型：
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作者：
Haiming Lai
本文提出了一种不同的循环结构。将固定床吸附器与强制非稳态周期性流动逆转操作应用于对流热波循环，从而产生所谓的周期性逆转强制对流循环，设想了性能的有趣改进。为了描述这种具有7种可能的流动逆转操作模式的循环过程行为，建立了沸石13x -水对的两相一维模型。讨论了热管效应、内外热再生等重要现象。数值模拟结果表明，在所有可能的回流运行模式中，只有CCAA模式（每个相持续时间切换流动方向）可以改善非回流运行的整体性能，而其他模式则不能。在目前的循环条件下，所提出的带换热器蓄热器的CCAA循环比不带回流操作的常规循环和现有的带惰性填充床蓄热器的对流热波循环的性能系数（COP）都有显著提高。计算结果还表明，在该系统内，COPh可达1.7以上，copc可达0.9以上，吸附剂比冷功率（SCP）可达125 W/kg。分析对这些结果给出了满意的解释。
A different cycle configuration is suggested in this work. Interesting improvement in performances is envisaged by applying the fixed bed adsorbers with the forced unsteady-state operation of periodic flow reversal to convective thermal wave cycle, which results in the so-called Periodic Reversal Forced Convective cycle. To describe process behavior for this kind of cycle with seven possible operating modes of flow reversal, a two-phase, one-dimensional model for the zeolite 13X-water pair is developed. Some important phenomena, such as the heat pipe effect, internal and external thermal regeneration etc., are discussed. The results of numerical simulations show that among all possible operating modes of flow reversal, only the mode of CCAA (switching the flow directions each phase duration) could improve the global performances of non-reversed flow operation, but others could not. Under the current conditions of cycle, the proposed CCAA cycle with heat exchanger regenerator could offer significant improvements in coefficient of performance (COP) over both the conventional cycle without flow reversal operation and existing convective thermal wave cycle with inert packed bed regenerator. The results of calculation also show that more than 1.7 of COPh, 0.9 of COPcand 125 W/kg adsorbent of specific cooling power (SCP) within this system could be possible. Analysis gives satisfactory explanation of these results.