Journal of energy storage最新文献_第2页

Energy management strategy and operation strategy of hybrid energy storage system to improve AGC performance of thermal power units 改善火电机组 AGC 性能的混合储能系统能源管理策略和运行策略

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114191

With the continuous increase of the renewable energy power generation penetration, the intermittency and fluctuation of renewable energy power generation make the traditional thermal power units (TPU) which play the main role of regulation need to undertake more frequent and more severe regulation tasks. In order to improve the automatic generation control (AGC) command response capability of TPU, an operation strategy of hybrid energy storage system (HESS) is proposed in this paper. While assisting TPU to complete the regulation tasks, it gives full play to the advantages of power-type and energy-type energy storage. Moreover, an energy management strategy of energy storage array (ESA) is proposed to improve the overall operation efficiency of ESA while making the state of charge (SOC) of all energy storage subunits consistent. Finally, the effectiveness of the proposed strategy is verified by simulation experiments. The results show that after using HESS to assist TPU operation, the comprehensive regulation performance index of TPU increased from 4.0198 to 7.8112, which significantly improved the operational flexibility of TPU. Meanwhile, the strategy proposed in this paper makes different types of energy storage systems in HESS operate in a relatively healthy SOC range, and the SOC of the flywheel energy storage system (FESS) reaches the limitation value decrease from 6 times to once, ensuring the overall charge and discharge capacity of HESS.

随着可再生能源发电渗透率的不断提高，可再生能源发电的间歇性和波动性使得扮演调节主角的传统火电机组（TPU）需要承担更频繁、更严峻的调节任务。为了提高火电机组的自动发电控制（AGC）指令响应能力，本文提出了一种混合储能系统（HESS）的运行策略。在辅助 TPU 完成调节任务的同时，充分发挥电力型储能和能量型储能的优势。此外，本文还提出了一种储能阵列（ESA）的能量管理策略，以提高 ESA 的整体运行效率，同时使所有储能子单元的电荷状态（SOC）保持一致。最后，通过仿真实验验证了所提策略的有效性。结果表明，使用 HESS 辅助 TPU 运行后，TPU 的综合调节性能指标从 4.0198 提高到 7.8112，显著提高了 TPU 的运行灵活性。同时，本文提出的策略使HESS中不同类型储能系统的SOC运行在相对健康的范围内，飞轮储能系统（FESS）的SOC达到限制值的次数由6次减少到1次，保证了HESS的整体充放电能力。

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引用次数: 0

Recyclable cellulose-based vitrimer electrolytes for lithium ion batteries 用于锂离子电池的可回收纤维素基三聚氰胺电解质

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114175

Cellulose as polymer electrolytes in lithium-ion batteries (LIBs) has a number of advantages such as low cost, readily available, abundant, environmentally friendly, and contains electron-donating groups within its structure. Beside, vitrimers are a novel class of polymer materials made of dynamic covalent networks that can undergo bond-exchange processes. Beyond cellulose's special qualities, cellulose-based vitrimer production is highly desired for enhancing electrolytes mechanical qualities, thermal stability, cyclability, and ionic conductivity. In this study, cellulose-based vitrimeric polymer electrolytes are prepared. At first, poly(glycidyl methacrylate-co-methyl acrylate) by different ratios of comonomers is prepared and then cellulose is cross-linked by prepared copolymers. Prepared vitrimers are recycled four steps through transesterification reaction and as-prepared and recycled crosslinked celluloses are used as gel polymer electrolytes (GPEs). The results showed the best ionic conductivity of as-prepared samples in order of 10⁻⁴ S/cm whereas ionic conductivity increased to order of 10⁻³ S/cm for recycled samples. Also, high lithium-ion transfer number of >0.8 was achieved for recycled samples. All as-prepared and recycled electrolytes had excellent electrochemical stability window (> 5 V). Also, improved specific capacity (>178 mA h g⁻¹ with capacity retention upper than 90 % after 200 cycles at 0.2C of LiCoO₂/GPEs/Gr) was attained.

纤维素作为锂离子电池（LIB）的聚合物电解质具有成本低、易于获得、资源丰富、环保以及结构中含有电子捐献基团等诸多优点。此外，玻璃聚合物是一类由动态共价网络组成的新型聚合物材料，可以进行键交换过程。除了纤维素的特殊品质外，纤维素基玻璃聚合物的生产在提高电解质的机械品质、热稳定性、可循环性和离子导电性方面也有很高的需求。本研究制备了纤维素基三聚体聚合物电解质。首先用不同比例的共聚单体制备聚（甲基丙烯酸缩水甘油酯-丙烯酸甲酯），然后用制备的共聚物交联纤维素。通过酯交换反应将制备好的三聚体循环使用四个步骤，然后将制备好的纤维素和循环交联的纤维素用作凝胶聚合物电解质（GPE）。结果表明，原样制备的样品离子传导性最好，约为 10-4 S/cm，而回收样品的离子传导性则提高到 10-3 S/cm。此外，回收样品的锂离子转移数高达 0.8。所有制备的和回收的电解质都具有出色的电化学稳定性窗口（5 V）。此外，还提高了比容量（>178 mA h g-1，钴酸锂/GPEs/Gr 在 0.2C 下循环 200 次后容量保持率高于 90%）。

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引用次数: 0

Porous NiO/CuCo2O4 nanocrystalline heterojunction composites derived from polymetallic coordination polymers for advanced supercapacitor 用于先进超级电容器的多金属配位聚合物衍生多孔 NiO/CuCo2O4 纳米晶异质结复合材料

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114150

NiO is considered as a promising electrode material owing to its high theoretical capacitance. However, the inherent low conductivity and huge volume expansion during cycling limit its practical application. Constructing composites is considered as an effective way to improve charge transfer efficiency and enhance electrochemical performance. Therefore, many researchers are devoted to combining NiO with other materials to build composites to solve this problem. However, the preparation of composites with uniformly distributed heterojunctions in a simple way remains a major challenge. Herein, porous NiO/CuCo₂O₄ composites with uniformly distributed heterojunctions were fabricated via a facile and cost-effective method. Benefiting from the porous structure and the synergistic effect of NiO and CuCo₂O₄, the NiO/CuCo₂O₄–450 electrode exhibits outstanding specific capacitance of 962 F g⁻¹ at the current density of 1 A g⁻¹. Additionally, with porous NiO/CuCo₂O₄–450 composites as anode and active carbon (AC) as cathode, the asymmetric supercapacitor (ASC) provides an energy density of 25.17 Wh kg⁻¹ at a power density of 400 W kg⁻¹ and an excellent cycle life. This study provides a facile and favourable strategy for the preparation of composites with distinguished electrochemical properties.

由于理论电容较高，氧化镍被认为是一种前景广阔的电极材料。然而，其固有的低电导率和循环过程中巨大的体积膨胀限制了它的实际应用。构建复合材料被认为是提高电荷转移效率和增强电化学性能的有效方法。因此，许多研究人员致力于将氧化镍与其他材料结合起来制备复合材料，以解决这一问题。然而，如何以简单的方法制备具有均匀分布异质结的复合材料仍是一大挑战。本文通过一种简便、经济的方法制备了具有均匀分布异质结的多孔 NiO/CuCo2O4 复合材料。得益于多孔结构以及 NiO 和 CuCo2O4 的协同效应，NiO/CuCo2O4-450 电极在 1 A g-1 的电流密度下表现出了 962 F g-1 的出色比电容。此外，以多孔 NiO/CuCo2O4-450 复合材料为阳极、活性碳（AC）为阴极的非对称超级电容器（ASC）在功率密度为 400 W kg-1 时可提供 25.17 Wh kg-1 的能量密度和出色的循环寿命。这项研究为制备具有优异电化学性能的复合材料提供了一种简便而有利的策略。

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引用次数: 0

Effects of methyl orange on the H2/brine wettability of carbonate rocks: Implications for H2 geo-storage 甲基橙对碳酸盐岩的 H2/卤水润湿性的影响：对 H2 地质储存的影响

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114076

Nowadays, researchers have shown interest in hydrogen energy because it is regarded as a clean energy and a viable alternative to carbon-based fossil fuels. However, hydrogen has low volumetric energy density and must be stored in large volumes to fulfil global energy demands. Underground hydrogen storage in a geological structure is considered the best choice due to its safety and higher storage capacity than surface storage. In this study, the advancing

(θ_{a})

and receding

(θ_{r})

contact angles of the stearic acid–aged calcite before and after the treatment with different concentrations (10–100 mg/L) of methyl orange (MO) were measured at reservoir conditions (pressure range: 1–15 MPa, temperatures of 25 °C and 50 °C, and constant salinity of 0.3 M). Moreover, atomic force microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy were used to characterize the effects of MO on stearic acid–aged calcite. The findings demonstrated that stearic acid–aged calcite exhibited hydrophobic condition (H₂-wet); however, the wettability of the stearic acid–aged calcite was restored to the original hydrophilic condition (water-wet) upon treatment with optimum MO concentration (100 mg/L). The surface roughness of pure calcite increased from 5.4 nm to 137 nm when modified with stearic acid due to the adsorption of organic acid molecules on the surface. However, the surface roughness further decreased from 137 to 49 nm when treated with MO, showing that MO treatment increased the rock water's wetting tendency. This research highlights the importance of the MO injection into an underground reservoir that could provide a better solution to subside the negative effects of discharging MO into the environment and maximise the storage capacity of H₂.

如今，研究人员对氢能产生了浓厚的兴趣，因为氢能被认为是一种清洁能源，是碳基化石燃料的可行替代品。然而，氢的体积能量密度较低，必须大量储存才能满足全球能源需求。与地面存储相比，地质结构中的地下氢存储因其安全性和更高的存储容量而被认为是最佳选择。本研究在储氢条件下（压力范围：1-15 兆帕；温度范围：25℃；压力范围：1-15 兆帕；温度范围：25℃）测量了硬脂酸老化方解石在使用不同浓度（10-100 毫克/升）的甲基橙（MO）处理前后的前进θa 和后退θr 接触角：1-15 兆帕，温度分别为 25 °C 和 50 °C，盐度恒定为 0.3 M）。此外，还使用原子力显微镜、扫描电子显微镜和能量色散 X 射线光谱来表征 MO 对硬脂酸老化方解石的影响。研究结果表明，硬脂酸老化方解石表现出疏水状态（H2-湿）；但在使用最佳浓度（100 毫克/升）的 MO 处理后，硬脂酸老化方解石的润湿性恢复到原来的亲水状态（水-湿）。用硬脂酸改性后，由于表面吸附了有机酸分子，纯方解石的表面粗糙度从 5.4 nm 增加到 137 nm。然而，经 MO 处理后，表面粗糙度进一步从 137 nm 降至 49 nm，这表明 MO 处理增加了岩石水的润湿倾向。这项研究强调了向地下水库注入 MO 的重要性，它可以提供一种更好的解决方案，缓解向环境排放 MO 所带来的负面影响，并最大限度地提高 H2 的储存能力。

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引用次数: 0

A highly water-soluble phenoxazine quaternary ammonium compound catholyte for pH-neutral aqueous organic redox flow batteries 用于 pH 值中性水溶液有机氧化还原液流电池的高水溶性吩嗪季铵化合物阴离子溶液

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114162

The pH-neutral aqueous redox flow battery (ARFB) is one of the most attractive flow batteries due to its non-corrosiveness, low-cost, and wider electrochemical stability window compared to those with acidic or alkaline electrolytes. However, there are few families of organic redox-active molecules available as catholyte materials for pH-neutral ARFBs. Herein, through incorporation of quaternary ammonium moiety into the redox-active phenoxazine nucleus, an organic catholyte material, N, N, N-trimethyl-2-(10H-phenoxazin-10-yl) ethan-1-aminium chloride (NEt-POZ) is achieved for pH-neutral ARFBs. The NEt-POZ has a high redox potential of 0.79 V versus SHE and rapid redox kinetics (0.23 cm s⁻¹) as well as high water-solubility (∼2.6 M in H₂O). Paired with a methyl viologen (MV) anolyte in the pH-neutral aqueous electrolyte, a viologen-phenoxazine ARFB full cell is assembled, which shows an open circuit voltage of ∼1.23 V. However, the results of long-term cycling experiments indicate low Coulomb efficiency and rapid declining capacity of the NEt-POZ catholyte. The mechanism analysis unveils that the unstable doubly oxidized tri-cations (NEt-POZ³⁺) formed via the disproportionation of radical di-cations (NEt-POZ²⁺) in solution readily react with chloride anions to form poly-chlorinated derivatives, which precipitate from the catholyte due to their poor water solubility, leading to a rapid decrease in capacity. When there is no chloride present in the electrolyte solution, highly reactive NEt-POZ³⁺ cations can interact with other counter-anions (such as sulfate and carbonate ions) and even water to form complex adducts.

pH 值中性的水氧化还原液流电池（ARFB）与酸性或碱性电解质的液流电池相比，具有无腐蚀性、低成本和更宽的电化学稳定性窗口等优点，是最具吸引力的液流电池之一。然而，很少有有机氧化还原活性分子系列可用作 pH 值中性 ARFB 的阴极溶质材料。在这里，通过在具有氧化还原活性的吩噁嗪核中加入季铵分子，一种有机溶液材料--N, N, N-三甲基-2-（10H-吩噁嗪-10-基）乙烷-1-氯化铵（NEt-POZ）被用于 pH 值中性的 ARFB。NEt-POZ 对 SHE 的氧化还原电位高达 0.79 V，氧化还原动力学速度快（0.23 cm s-1），水溶性高（在 H2O 中为 2.6 M）。然而，长期循环实验结果表明，NEt-POZ 电解质的库仑效率较低，容量迅速下降。机理分析表明，在溶液中通过自由基二阳离子（NEt-POZ2+）歧化形成的不稳定双氧化三阳离子（NEt-POZ3+）很容易与氯阴离子发生反应，形成多氯衍生物，这些衍生物由于水溶性差而从阴极溶液中析出，导致容量迅速下降。当电解质溶液中不存在氯离子时，高活性 NEt-POZ3+ 阳离子可与其他反离子（如硫酸根离子和碳酸根离子）甚至水发生作用，形成复杂的加合物。

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引用次数: 0

Optimizing strategies for high Li+ transference number in solid state electrolytes for lithium batteries: A review 锂电池固态电解质中高锂离子转移率的优化策略：综述

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114210

Lithium-ion batteries (LIBs) have revolutionized in the field of energy storage. However, commercial LIBs contain highly volatile flammable and organic electrolytes, which makes LIBs posing significant safety hazard. Solid polymer electrolytes have the potential to address these safety problems and are expected to become the next generation of high safety all-solid LIBs electrolyte materials. Nonetheless, the strong solvation effect between lithium ions (Li⁺) and solvent molecules in common electrolytes limits the mobility of Li⁺ ions. As a result, anions dominate charge conduction in electrolytes, and in most cases, the Li⁺ transference number (t_Li⁺) is between 0.2 and 0.4. A low t_Li⁺ exacerbates concentration polarization during the charging and discharging process, especially at high rates. This not only increases the overpotential but also intensifies side reactions, leading to uneven deposition of lithium (Li) and the growth of lithium dendrites when lithium metal is used as anode. This review briefly discussed the lithium-ion conduction mechanism of solid polymer electrolytes and the research progress in improving the comprehensive electrochemical performance of solid polymer electrolytes. With this in mind, we classify and summarize approaches of enhancing t_Li⁺ from three perspectives: lithium salts, modification of polymers, and addition of fillers to polymer electrolytes. We believe this review will provide a systematic understanding and summary of t_Li⁺ and point out some feasible strategies to enhance battery performance by enhancing t_Li⁺.

锂离子电池（LIB）在能源存储领域带来了革命性的变化。然而，商用锂离子电池含有高挥发性易燃有机电解质，这使得锂离子电池存在重大安全隐患。固体聚合物电解质具有解决这些安全问题的潜力，有望成为下一代高安全性的全固态锂离子电池电解质材料。然而，普通电解质中锂离子（Li+）与溶剂分子之间的强溶解效应限制了 Li+ 离子的流动性。因此，电解质中的电荷传导以阴离子为主，在大多数情况下，Li+转移数（tLi+）介于 0.2 和 0.4 之间。低 tLi+ 会加剧充放电过程中的浓度极化，尤其是在高速充放电时。这不仅会增加过电位，还会加剧副反应，导致锂（Li）沉积不均匀，并在使用锂金属作为阳极时产生锂枝晶。本综述简要讨论了固体聚合物电解质的锂离子传导机理以及在提高固体聚合物电解质综合电化学性能方面的研究进展。有鉴于此，我们从锂盐、聚合物改性和聚合物电解质添加填料三个角度对提高 tLi+ 的方法进行了分类和总结。我们相信，这篇综述将使我们对 tLi+ 有一个系统的了解和总结，并指出一些通过增强 tLi+ 来提高电池性能的可行策略。

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引用次数: 0

CoMoO4 nano-architecture-based supercapacitors: Tunable properties, performance optimization, and prospective applications 基于 CoMoO4 纳米结构的超级电容器：可调特性、性能优化和应用前景

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114063

Supercapacitors (SCs) are emerging as promising energy storage technology, thanks to their high-power density, rapid charging/discharging capabilities, and extended cycle life. The quest for enhanced performance, particularly in terms of energy density, has driven extensive exploration into innovative electrode materials to bolster performance. This study focuses on recent advancements in CoMoO₄ (CMO) with engineered architectures serving as electrodes for high-performance SCs. A distinct advantage lies in the ability of Co and Mo ions to exist in a range of oxidation states, promising increased energy density, enhanced cycling stability, and prolonged discharge time for SCs. These advancements encompass α, β, and hydrated (H)-CMO with adjusted electronic structures and adopting unique morphologies. Despite the longstanding study of CMO architectures, their inherent low conductivity and volume fluctuations during operation hinder further SC applications. To overcome these challenges, the integration of various materials has been explored. Concurrently, incorporating conductive materials (polymers, metal elements, amorphous carbon, graphene, carbon nanotubes, etc.) and introducing metals, heteroatoms, and defects into the electrode matrix (oxygen vacancies, heterojunctions) have proven effective in enhancing electrochemical performance. This review aims to provide recommendations for optimizing the performance of CMO-based SC electrode materials by manipulating the conductivity and reactivity of CMO. As a guiding principle, optimizing crystallite size, morphology, and synthesis and deposition strategies is crucial for the sustainable development of CMO-based nano-architecture designs for thick and flexible electrodes in prospective practical electronic storage devices.

超级电容器（SC）凭借其高功率密度、快速充电/放电能力和更长的循环寿命，正在成为一种前景广阔的储能技术。为了提高性能，特别是能量密度，人们对创新电极材料进行了广泛的探索。本研究重点关注 CoMoO4（CMO）的最新进展，其工程结构可用作高性能 SC 的电极。其显著优势在于钴和钼离子能够以各种氧化态存在，从而有望提高能量密度、增强循环稳定性并延长 SC 的放电时间。这些进步包括调整电子结构和采用独特形态的 α、β 和水合 (H) -CMO。尽管对 CMO 结构的研究由来已久，但其固有的低电导率和运行过程中的体积波动阻碍了 SC 的进一步应用。为了克服这些挑战，人们探索了各种材料的集成。同时，在电极基体中加入导电材料（聚合物、金属元素、无定形碳、石墨烯、碳纳米管等）以及引入金属、杂原子和缺陷（氧空位、异质结）已被证明能有效提高电化学性能。本综述旨在通过操纵 CMO 的导电性和反应性，为优化基于 CMO 的 SC 电极材料的性能提供建议。作为一项指导原则，优化晶粒尺寸、形态以及合成和沉积策略对于基于 CMO 的纳米结构设计的可持续发展至关重要，这些设计可用于未来实用的电子存储设备中的厚电极和柔性电极。

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引用次数: 0

Zr-doped Li4Ti5O12 particles coated with reduced graphene oxide nanolayer as anode for high-rate lithium-ion batteries 掺杂 Zr 的 Li4Ti5O12 粒子涂有还原氧化石墨烯纳米层，可用作高倍率锂离子电池的负极

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114165

Lithium titanate (Li₄Ti₅O₁₂/LTO) has been widely recognized for its superior stability and long cycle life as a negative electrode material for lithium-ion batteries. However, its limited specific capacity and poor rate performance have hindered broader applications. This study introduces an innovative approach to address these limitations by preparing Zr-doped Li₄Ti₅O₁₂ coated with reduced graphene oxide (rGO) (LTO-0.1Zr@rGO) using a wet chemical method combined with freeze-drying technology. The incorporation of Zr ions into the LTO lattice resulted in an increase in the lattice parameter and the unit cell volume. This increase facilitated the transmission of lithium ions and enhanced the material's conductivity. Furthermore, the rGO coating was found to significantly enhance the rate performance and cycle stability of the material. The LTO-0.1Zr@rGO composite demonstrated a high rate capacity ranging from 396.5 to 263.6 mAh g⁻¹ at current densities varying from 0.2 to 5.0 A g⁻¹, with a stable capacity of 310.2 mAh g⁻¹ maintained after 1000 cycles at a current density of 1.0 A g⁻¹. These results indicate the potential of LTO-0.1Zr@rGO as a promising anode material for high-rate and stable lithium-ion batteries.

钛酸锂（Li4Ti5O12/LTO）作为锂离子电池的负极材料，以其卓越的稳定性和较长的循环寿命而得到广泛认可。然而，其有限的比容量和较差的速率性能阻碍了其更广泛的应用。本研究采用湿化学方法结合冷冻干燥技术制备了掺杂 Zr 的 Li4Ti5O12，并在其表面涂覆了还原型氧化石墨烯（rGO）（LTO-0.1Zr@rGO），从而引入了一种创新方法来解决这些局限性。在 LTO 晶格中加入 Zr 离子后，晶格参数和单胞体积都有所增加。这种增加促进了锂离子的传输并提高了材料的导电性。此外，研究还发现 rGO 涂层能显著提高材料的速率性能和循环稳定性。LTO-0.1Zr@rGO 复合材料在 0.2 至 5.0 A g-1 的电流密度下显示出 396.5 至 263.6 mAh g-1 的高倍率容量，在 1.0 A g-1 的电流密度下循环 1000 次后仍能保持 310.2 mAh g-1 的稳定容量。这些结果表明，LTO-0.1Zr@rGO 有潜力成为高倍率、稳定的锂离子电池负极材料。

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引用次数: 0

Experimental study on the melting characteristics modulation of cubic ice cubes with different trace air contents under natural convection condition 自然对流条件下不同微量空气含量立方冰块熔化特性调制的实验研究

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114186

Ice as a typical phase change material has the advantages of low cost, high latent heat and environmental friendliness, and the ice melting process under natural convective conditions is a fundamental study that has received wide attention. For the cubic ice cubes having different air contents, their melting characteristics becomes more complicated. The melting model of cubic ice under natural convection conditions was developed, which can accurately predict the time of the entire melting process. To validate the accuracy of the model, a series of melting experiments on cubic ice cubes are conducted and analyzed, with mass and air contents varied from 20 g to 50 g, and from 0 to 3.9 %, with a model error of less than ±20 %. Based on the maximum melt rate and the change in shape to a pyramid of cubic ice, the melting process can be divided into the initial melting, frustum-shaped, and pyramid-shaped stages. Varying the air content of the ice regulated the total melting time and the time proportion of the initial melting stage and the frustum-shaped stage of the ice. The proportion of time in the pyramid-shaped stage decreased from 64.3 % to 51.5 % for bubble ice with an air content of 3.9 % compared to clear ice. The proportion of time in the pyramid-shaped stage during the ice melting process is not significantly related to the air content and mass, and remains at approximately 27 %. Results of this study are meaningful for regulating the melting process and optimizing phase change energy storage technologies.

冰作为一种典型的相变材料，具有成本低、潜热高和环境友好等优点，自然对流条件下的冰熔化过程是一项基础研究，受到广泛关注。对于空气含量不同的立方体冰块，其熔化特性变得更加复杂。本文建立了自然对流条件下立方冰的熔化模型，该模型可以准确预测整个熔化过程的时间。为了验证模型的准确性，进行了一系列立方体冰块的熔化实验和分析，质量和空气含量从 20 克到 50 克，从 0% 到 3.9% 不等，模型误差小于 ±20%。根据最大熔化率和立方体冰块向金字塔形状的变化，可将熔化过程分为初始熔化阶段、圆锥体阶段和金字塔阶段。改变冰中的空气含量可以调节总的融化时间以及冰的初始融化阶段和锥形阶段的时间比例。与透明冰相比，空气含量为 3.9% 的气泡冰在金字塔形阶段的时间比例从 64.3% 降至 51.5%。在冰融化过程中，处于金字塔形阶段的时间比例与空气含量和质量的关系不大，大约保持在 27%。这项研究的结果对于调节融化过程和优化相变储能技术很有意义。

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引用次数: 0

Efficiency improvement and pressure pulsation reduction of volute centrifugal pump through diffuser design optimization 通过优化扩散器设计提高涡壳离心泵效率并减少压力脉动

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114184

To investigate the effects of load distribution parameters of the diffuser vanes on the efficiency and pressure pulsation of the volute centrifugal pump, the diffuser shape was designed using an inverse design method, and an optimization method was proposed for the diffuser blade load distribution based on the combination of Latin hypercubic sampling, artificial neural network, and non-dominated sorting genetic algorithm-II. Steady and unsteady simulations were performed by solving the three-dimensional Reynolds-averaged Navier–Stokes equations using the shear stress transport

k - ω

turbulence model. The results obtained from Pearson correlation analysis revealed that the slope values

K_{s}

and

K_{h}

of the shroud and hub load distribution curves had the most significant effect on the pump head and efficiency. Compared with those of the original model, the efficiency and head of the optimized volute centrifugal pump under the design conditions increased by 3.8 and 3.5 %, respectively. The pressure pulsation intensities in the vaneless regions were effectively mitigated for the optimized volute centrifugal pump. The pressure pulsation coefficients at three times the diffuser vane frequency (3

f_{DIF}

) reduced by 58.5 and 43.8 % at monitoring points M₁ and M₂, in the impeller outlet, respectively. The pressure pulsation coefficients at the impeller blade passing frequency (

f_{BPF}

) reduced by 6.5 and 14.4 % at monitoring points M₃ and M₄ in the diffuser inlet, respectively. The results showed that the optimized diffuser improved the overall performance of the volute centrifugal pump, and demonstrated the feasibility of the optimization method.

为研究扩散器叶片载荷分布参数对涡壳离心泵效率和压力脉动的影响，采用逆向设计方法设计了扩散器形状，并提出了基于拉丁超立方体采样、人工神经网络和非支配排序遗传算法-II相结合的扩散器叶片载荷分布优化方法。利用剪应力传输 k-ω 湍流模型求解三维雷诺平均纳维-斯托克斯方程，进行了稳定和非稳定模拟。皮尔逊相关分析结果表明，护罩和轮毂载荷分布曲线的斜率值 Ks 和 Kh 对泵扬程和效率的影响最大。与原始模型相比，优化后的涡壳离心泵在设计工况下的效率和扬程分别提高了 3.8% 和 3.5%。优化后的涡壳离心泵有效缓解了无阀区的压力脉动强度。在叶轮出口的监测点 M1 和 M2，三倍扩散器叶片频率（3fDIF）下的压力脉动系数分别降低了 58.5% 和 43.8%。叶轮叶片通过频率（fBPF）下的压力脉动系数在扩散器入口的监测点 M3 和 M4 分别降低了 6.5% 和 14.4%。结果表明，优化后的扩散器提高了涡壳离心泵的整体性能，证明了优化方法的可行性。

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引用次数: 0