Valorization of phosphogypsum as a thermal energy storage material for low temperature applications
Valorization of phosphogypsum as a thermal energy storage material for low temperature applications
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DOI：
10.1016/j.jclepro.2022.130839
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发表时间：
2022-02-18
影响因子：
11.1
通讯作者：
Gaidajis, G.
中科院分区：
文献类型：
--
作者：
Anagnostopoulos, Argyrios;Navarro, M.;Gaidajis, G.
磷石膏（PG）是化肥工业的工业副产品，通常被处置在海洋、水坝或堤坝中，其由于放射性重金属含量升高而呈现显著的环境危害。其中只有15%被回收利用，为此，提出了一个新的循环经济案例。PG与商业级石蜡组合以制造复合相变材料（CPCM）。在96次循环（25至100 ℃）后没有观察到潜热和熔点的变化，表明良好的热稳定性。最大潜热为75 J/g（石蜡含量为60%），而最佳平均比热容为1.54 J/gK。导热系数高达0.46 W/mK，比纯石蜡高75%。最大储能密度为237 MJ/m3，仅比纯石蜡低14%。在ANSYS中还研究了基于PG的CPCM的实验室规模TES布局。评估传热流体（在这种情况下为空气）的流速的影响。当流量为5.5和22 L/min时，充放电效率分别达到88.1%和66.2%。
Phoshpogypsum (PG) is an industrial byproduct of the fertilizer industry typically disposed in the sea, dams or dykes, which presents a significant environmental hazard due to elevated content in radioactive heavy metals. Only 15% of it is recycled, and to this end, a novel circular economy case is proposed. The PG is combined with a commercial-grade paraffin to fabricate composite phase change materials (CPCMs). No variation in latent heat and melting point are observed after 96 cycles (25 to 100 degrees C) denoting good thermal stability. Maximum latent heat is 75 J/g (60% paraffin content), while the optimal average specific heat capacity is 1.54 J/gK for the same paraffin content. The thermal conductivity is found to be up to 0.46 W/mK; 75% higher than pure paraffin. The maximum energy storage density is 237 MJ/m 3; only 14% lower than the pure paraffin. A lab scale TES layout of the PG based CPCMs is also investigated in ANSYS. The effect of the flow rate of the heat transfer fluid, in this case air, is evaluated. A maximum charge and discharge efficiency of 88.1% and 66.2% respectively, is achieved for flow rates of 5.5 and 22 L/min correspondingly.