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Thermodynamic cycles for solar thermal power plants: A review 太阳能热发电厂的热力学循环:综述
IF 6.1 3区 工程技术 Q2 ENERGY & FUELS Pub Date : 2021-10-17 DOI: 10.1002/wene.420
Marta Muñoz, A. Rovira, M. J. Montes
Solar thermal power plants for electricity production include, at least, two main systems: the solar field and the power block. Regarding this last one, the particular thermodynamic cycle layout and the working fluid employed, have a decisive influence in the plant performance. In turn, this selection depends on the solar technology employed. Currently, the steam Rankine cycle is the most widespread and commercially available option, usually coupled to a parabolic trough solar field. However, other configurations have been implemented in solar thermal plants worldwide. Most of them are based on other solar technologies also coupled to a steam Rankine cycle, although integrated solar combined cycles have a significant level of implementation. In the first place, power block configurations based on conventional thermodynamic cycles—Rankine, Brayton, and combined Brayton–Rankine—are described. The achievements and challenges of each proposal are highlighted, for example, the benefits involved in hybrid solar source/fossil fuel plants. In the second place, proposals of advanced power block configurations are analyzed, standing out: supercritical CO2 Brayton cycles, advanced organic Rankine cycles, and innovative integrated solar combined cycles. Each of these proposals shows some advantages compared to the conventional layouts in certain power or source temperature ranges and hence they could be considered attractive options in the medium term. At last, a brief review of proposals of solar thermal integration with other renewable heat sources is also included.
用于发电的太阳能热发电厂至少包括两个主要系统:太阳能场和电力块。关于最后一个问题,特定的热力循环布局和使用的工作流体对工厂性能有决定性影响。反过来,这种选择取决于所采用的太阳能技术。目前,蒸汽朗肯循环是最广泛和商业上可用的选择,通常与抛物线槽太阳能场耦合。然而,其他配置已经在世界各地的太阳能热电厂中实施。其中大多数基于其他太阳能技术,也与蒸汽朗肯循环相结合,尽管集成太阳能联合循环的实施水平很高。首先,描述了基于传统热力学循环的功率块配置——兰金循环、布雷顿循环和布雷顿-兰金组合循环。每项提案的成就和挑战都得到了强调,例如,混合太阳能/化石燃料发电厂所带来的好处。其次,分析了先进的功率块配置方案,突出了:超临界CO2布雷顿循环、先进的有机朗肯循环和创新的集成太阳能联合循环。在某些电源或电源温度范围内,与传统布局相比,这些方案中的每一个都显示出一些优势,因此在中期内都可以被视为有吸引力的选择。最后,还简要回顾了太阳能热集成与其他可再生热源的建议。
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引用次数: 5
Recent advances in electrocatalysts, mechanism, and cell architecture for direct formic acid fuel cells 直接甲酸燃料电池的电催化剂、机理和电池结构的最新进展
IF 6.1 3区 工程技术 Q2 ENERGY & FUELS Pub Date : 2021-10-12 DOI: 10.1002/wene.419
R. Bhaskaran, B. Abraham, R. Chetty
Direct formic acid fuel cells (DFAFCs) are potential candidates as power sources for various applications, especially in portable electronics and medical diagnostic devices. Though they have been the subject of considerable research, commercial prototypes of DFAFCs are rudimentary compared to other liquid fuel cells, particularly the widespread methanol‐based direct methanol fuel cells. Various strategies for rationally engineering the electrocatalysts for enhancing DFAFC performance have been explored in the last few years, such as alloying noble metals with earth‐abundant transition metals, designing specific morphological and structural arrangements, decorating the surface with corrosion‐tolerant cocatalysts, and providing better catalyst support for effective catalyst dispersion. An overall approach may be necessary and should include (i) understanding the underlying mechanism, which will guide the direction of catalyst engineering, (ii) employing morphological, compositional, and structural control of the electrocatalysts to improve catalyst utilization and enhance the intrinsic activity for real‐world applications, and (iii) integrating these in a proficiently designed cell architecture suitable for targeted applications. In this review, we focus on the recent advances in electrocatalysts, formic acid electrooxidation mechanisms, and DFAFC cell architectures, which could help address the opportunities and challenges of commercializing DFAFC as a prospective alternative power source for portable applications.
直接甲酸燃料电池(dafcs)是各种应用的潜在候选电源,特别是在便携式电子设备和医疗诊断设备中。尽管dafcs已经成为大量研究的主题,但与其他液体燃料电池相比,特别是与广泛使用的甲醇基直接甲醇燃料电池相比,dafcs的商业原型还很初级。在过去的几年里,人们探索了各种合理设计电催化剂以提高dafc性能的策略,例如将贵金属与富含地球的过渡金属合金化,设计特定的形态和结构安排,用耐腐蚀的助催化剂装饰表面,以及为有效的催化剂分散提供更好的催化剂支持。一个全面的方法可能是必要的,应该包括(i)理解潜在的机制,这将指导催化剂工程的方向,(ii)采用电催化剂的形态、组成和结构控制,以提高催化剂的利用率,增强现实世界应用的内在活性,以及(iii)将这些整合到一个熟练设计的适合目标应用的细胞结构中。在这篇综述中,我们重点介绍了电催化剂、甲酸电氧化机制和dafc电池结构的最新进展,这有助于解决dafc作为便携式应用的潜在替代电源商业化的机遇和挑战。
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引用次数: 11
Issue Information 问题信息
IF 6.1 3区 工程技术 Q2 ENERGY & FUELS Pub Date : 2021-10-07 DOI: 10.1002/wene.383
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引用次数: 0
Issue Information 问题信息
IF 6.1 3区 工程技术 Q2 ENERGY & FUELS Pub Date : 2021-08-05 DOI: 10.1002/wene.382
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引用次数: 0
A review of wind turbine drivetrain loads and load effects for fixed and floating wind turbines 风力涡轮机传动系负载以及固定式和浮动式风力涡轮机的负载效应综述
IF 6.1 3区 工程技术 Q2 ENERGY & FUELS Pub Date : 2021-07-09 DOI: 10.1002/wene.417
W. Remigius, A. Natarajan
Drivetrain is one of the important subsystems in the wind turbine and faults and damages in the drivetrain significantly affect the wind turbine's downtime and nonavailability. Understanding the drivetrain dynamics and load effects that results in failures has been a major research area due to challenges in the drivetrain operations and maintenance. A systematic literature review of wind turbine drivetrains is presented according to key research areas of drivetrains, such as modeling and load effects on the drivetrain. Special emphasis is given for the floating wind turbine drivetrains. A review on the state‐of‐art modeling techniques of the drivetrain is presented. Studies concerning the aeroelastic load effects on the drivetrain components especially the gearbox and the bearings are discussed. Several key aspects such as aero‐hydro‐elastic interaction load effect and platform motion excitations on the floating wind turbine drivetrain dynamics are reviewed in detail. Finally, challenges related to floating wind turbine drivetrain are also discussed.
传动系是风力发电机组的重要子系统之一,传动系的故障和损坏对风力发电机组的停机和不可用性影响很大。由于动力传动系统操作和维护方面的挑战,了解动力传动系统动力学和负载影响导致的故障一直是一个主要的研究领域。针对风力机传动系统的关键研究领域,如传动系统建模和负载对传动系统的影响等,对风力机传动系统进行了系统的文献综述。特别强调了浮动风力涡轮机传动系统。对最新的动力传动系统建模技术进行了综述。讨论了气动弹性载荷对动力传动系统部件特别是齿轮箱和轴承的影响。对浮动式风力机动力传动系统动力学的几个关键方面,如气动-液压-弹性相互作用载荷效应和平台运动激励进行了详细的综述。最后,讨论了浮动式风力发电机传动系统所面临的挑战。
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引用次数: 2
Performance and future directions of transition metal sulfide‐based electrode materials towards supercapacitor/supercapattery 过渡金属硫化物基电极材料在超级电容器/超级图案方面的性能和未来方向
IF 6.1 3区 工程技术 Q2 ENERGY & FUELS Pub Date : 2021-07-01 DOI: 10.1002/wene.414
Arya Das, Benjamin Raj, M. Mohapatra, S. M. Andersen, S. Basu
Advanced and sustainable energy storage technologies with tailorable electrochemically active materials platform are the present research dominancy toward an urgent global need for electrical vehicles and portable electronics. Moreover, intensive efforts are given to screen the widely available low‐cost materials with a focus to achieve superior electrochemical performance for the fabrication of energy storage devices. Transition metal‐based sulfides have prodigious technological credibility due to their compositional‐ and morphological‐based tunable electrochemical properties. Here the significant advances and present state‐of‐the‐art of such assured materials in different energy storage devices are discussed. Assessment of the intensive work invested in the progress of transition metals such as V, Mn, Fe, Co, Ni, Cu, Zn Mo, and W based sulfides along with their structural/compositional engineering and addressable aspects for electrochemical performance enhancement are highlighted. Additionally, discussions on critical strategies for decisive mechanistic and kinetic views for charge storage phenomena with key challenges, such as volume expansions, low stability, and sluggish kinetics, are discussed. Finally, the challenges and future prospects demands for strategic approaches of such materials with prominence in futuristic directions are concluded.
具有可定制电化学活性材料平台的先进和可持续的储能技术是目前全球对电动汽车和便携式电子产品迫切需求的研究主导。此外,我们还致力于筛选广泛可用的低成本材料,重点是为制造储能器件实现卓越的电化学性能。过渡金属基硫化物由于其基于成分和形态的可调电化学性质,具有惊人的技术可信度。本文讨论了这种有保证的材料在不同储能装置中的重大进展和现有技术。重点评估了在过渡金属(如V、Mn、Fe、Co、Ni、Cu、Zn-Mo和W基硫化物)的进展方面投入的大量工作,以及它们的结构/成分工程和提高电化学性能的可寻址方面。此外,还讨论了电荷存储现象的决定性机制和动力学观点的关键策略,这些现象具有关键挑战,如体积膨胀、低稳定性和缓慢动力学。最后,总结了这种材料在未来方向上具有突出地位的战略方法所面临的挑战和未来前景要求。
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引用次数: 37
Innovative and mission‐oriented financing of renewable energy in Sub‐Saharan Africa: A review and conceptual framework 撒哈拉以南非洲可再生能源的创新和使命导向融资:综述和概念框架
IF 6.1 3区 工程技术 Q2 ENERGY & FUELS Pub Date : 2021-06-26 DOI: 10.1002/wene.416
Ogundiran Soumonni, K. Ojah
Notwithstanding the high levels of renewable energy resources across Sub‐Saharan Africa (SSA), modern energy use based on these abundant natural resources remains negligible. Furthermore, the current electrification rates and reliability of available power supply in the region have consistently remained significantly lower than the global average over the last three decades. And of the reasons advanced for this state of affairs, the lack of appropriate financing is said to be a crucial one. Therefore, focusing on a comparative overview of the dominant approaches to financing electrification, we characterize the persistence of this regional gap as a reflection of relative “policy stasis.” We then problematize this condition of stasis by employing the theoretical perspectives of mission‐oriented finance in conjunction with those of innovative finance and renewable energy innovation. In addition, we review relevant peer‐reviewed articles over the same period, and find evidence that indicates an underappreciation of financing models that stimulate endogenous technological innovation in renewable energy in SSA. Our analysis suggests that the types of innovation, associated configurations of financial actors, levels of capital intensity, and perceived risks in relation to beneficiaries, diverge from those accounted for in the dominant financing models. Consequently, we propose a novel, historically path‐dependent conceptual framework that emerges from the intersection among the concepts of mission‐oriented finance, endogenous innovation, and innovative financing, which we term “endogenous innovative financing.” This framework ultimately guides our recommendations for more promising financing mechanisms for resolving the interwoven challenges of sustainable universal electrification and renewable energy innovation in SSA.
尽管撒哈拉以南非洲(SSA)的可再生能源资源水平很高,但基于这些丰富自然资源的现代能源使用仍然微不足道。此外,该区域目前的电气化率和现有电力供应的可靠性在过去三十年中一直大大低于全球平均水平。在造成这种状况的原因中,缺乏适当的资金据说是一个至关重要的原因。因此,通过对电气化融资的主要途径进行比较,我们将这种地区差距的持续存在定性为相对“政策停滞”的反映。然后,我们将使命导向金融的理论观点与创新金融和可再生能源创新的理论观点结合起来,对这种停滞状态提出了问题。此外,我们回顾了同期同行评议的相关文章,发现有证据表明,在SSA中,对刺激可再生能源内生技术创新的融资模式低估了。我们的分析表明,创新类型、金融参与者的相关配置、资本密集度水平以及与受益人相关的感知风险与主流融资模式不同。因此,我们提出了一个新颖的、历史路径依赖的概念框架,它出现在使命导向金融、内生创新和创新融资概念的交叉点上,我们称之为“内生创新融资”。该框架最终指导我们提出更有前景的融资机制建议,以解决南撒哈拉地区可持续普遍电气化和可再生能源创新的相互交织的挑战。
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引用次数: 3
Recent progress on novel current collector electrodes for energy storage devices: Supercapacitors 储能装置新型集流电极的最新进展:超级电容器
IF 6.1 3区 工程技术 Q2 ENERGY & FUELS Pub Date : 2021-06-17 DOI: 10.1002/wene.415
Nitesh Kumar, L. Pradhan, B. Jena
Current collectors play a very crucial role in the performance of an energy storage device. Regarding supercapacitors, material design, processing, and current collectors' surface properties can result in substantial variation in energy density, power output, cyclic charge–discharge behavior, and other key performance parameters. Most of the reviews in supercapacitor materials and devices focus on the synthesis, characterization, and electrochemical properties of electrode materials. In the present report, the recent advances in supercapacitor electrodes in conjunction with current collector materials and design are summarized in light of various supercapacitor devices categorized concerning their applications and working mechanisms. It includes the literature documented on multifarious supercapacitors, that is, flow supercapacitors, alternating current line filtering supercapacitors, redox electrolyte‐enhanced supercapacitor, metal ion hybrid supercapacitors, microsupercapacitors, electrochromic supercapacitors, and self‐healing supercapacitors. To the best of authors' knowledge, this is a new and recent summarized report on the development of current collector materials based on intended applications and the working principles of supercapacitors.
集流器在储能装置的性能中起着非常关键的作用。关于超级电容器,材料设计、加工和集电器的表面特性可能会导致能量密度、功率输出、循环充放电行为和其他关键性能参数的显著变化。关于超级电容器材料和器件的综述大多集中在电极材料的合成、表征和电化学性能方面。在本报告中,结合各种超级电容器器件的应用和工作机制,总结了超级电容器电极与集电器材料和设计的最新进展。它包括关于各种超级电容器的文献,即流动超级电容器、交流线路滤波超级电容器,氧化还原电解质增强超级电容器和金属离子混合超级电容器。据作者所知,这是一份关于基于超级电容器的预期应用和工作原理开发集电材料的最新综述报告。
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引用次数: 10
Integration schemes for hybrid and polygeneration concentrated solar power plants 混合和多联产聚光太阳能电站的集成方案
IF 6.1 3区 工程技术 Q2 ENERGY & FUELS Pub Date : 2021-06-16 DOI: 10.1002/wene.412
J. Cardemil, A. Starke, Adriana Zurita, Carlos Mata‐Torres, R. Escobar
Concentrated solar power (CSP) technologies have been developed over the past four decades for commercial operation, establishing them as reliable power generation sources in regions with high direct solar irradiance. The sizing of the solar field, thermal energy storage systems, and power block enables CSP plants to operate under various operating conditions, while also exhibiting capabilities to generate multiple products such as electricity, heat, desalination, and cooling. The limitations of CSP systems can be reduced by utilizing the positive traits of other technologies, thus resulting in hybrid plant configurations that can fully exploit different technology strengths while minimizing their individual weaknesses. This review presents the state of the art on CSP stand‐alone plants for both power generation and combined generation of different products. Subsequently, the characteristics of CSP plants hybridized with photovoltaics, wind, fossil fuels, and biomass systems are discussed for both power multiple‐product generation. The review of assessment methodologies provides suggestions for both assessment and performance analysis and comparison with other generation technologies. This review shows that hybrid CSP plants have clear advantages in terms of cost, flexibility of operation, adaptability, and capability for the multigeneration of different products compared with stand‐alone plants used to generate each product individually. Hybrid CSP plants have advantages and can be designed to satisfy multiple demands on a case‐by‐case basis and are valid alternatives to combinations of stand‐alone plants.
聚光太阳能发电(CSP)技术在过去四十年的商业运行中得到了发展,使其成为太阳直射度高的地区可靠的发电来源。太阳能场、热能储存系统和电力块的规模使CSP工厂能够在各种运行条件下运行,同时也展示了产生多种产品的能力,如电力、热能、海水淡化和冷却。CSP系统的局限性可以通过利用其他技术的积极特性来减少,从而产生混合工厂配置,可以充分利用不同的技术优势,同时最大限度地减少各自的弱点。这篇综述介绍了CSP独立发电厂发电和不同产品联合发电的最新状况。随后,讨论了CSP电站与光伏、风能、化石燃料和生物质能系统混合发电的特点。对评估方法的审查为评估和性能分析以及与其他发电技术的比较提供了建议。这篇综述表明,与单独生产每种产品的独立工厂相比,混合CSP工厂在成本、操作灵活性、适应性和多代不同产品的能力方面具有明显的优势。混合CSP电站具有优势,可以根据具体情况设计以满足多种需求,是独立电站组合的有效替代方案。
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引用次数: 6
Long‐term trends of Nordic power market: A review 北欧电力市场的长期趋势:综述
IF 6.1 3区 工程技术 Q2 ENERGY & FUELS Pub Date : 2021-06-04 DOI: 10.1002/wene.413
Yi-kuang Chen, A. Hexeberg, K. E. Rosendahl, T. Bolkesjø
The Nordic power system will play an important role in a future carbon‐neutral European power market. In this study, 43 scenarios in 15 Nordic power market outlooks published between 2016 and 2019 are reviewed. Most scenarios see high future power prices with substantial correlation with assumed gas and emission quota prices. The underlying uncertainties in gas and emission quota prices are passed on to future power prices. The power prices are well above the cost of wind power, indicating that the wind deployment is either underestimated or might be largely dependent on non‐market factors. The models used for the outlooks have limited sector coverage and trade‐offs are made between computational resources and complexity. A set of recommendations for future outlook publications are proposed based on this review experience. Moving towards a low‐carbon future, more attention should be put to the demand side, especially with increasing importance of sector coupling and electrification. Also, to assess the profound uncertainties in the energy transition period, techniques besides scenario analysis can be applied. Explicit assessments on impacts of emerging topics, such as social oppositions to particular technologies and increased awareness of sustainability indicators besides clean energy, will add values for long‐term decision making in the power markets. Last but not the least, best efforts of clarity and transparency should always be ensured.
北欧电力系统将在未来碳中和的欧洲电力市场中发挥重要作用。在这项研究中,回顾了2016年至2019年间发布的15份北欧电力市场展望中的43种情景。大多数情况下,未来电价较高,与假定的天然气和排放配额价格有很大相关性。天然气和排放配额价格的潜在不确定性将传递给未来的电价。电价远高于风电成本,这表明风电部署要么被低估,要么可能在很大程度上取决于非市场因素。用于展望的模型覆盖了有限的行业,并且在计算资源和复杂性之间进行了权衡。根据这一审查经验,提出了一套关于未来展望出版物的建议。在迈向低碳未来的过程中,应更多地关注需求侧,尤其是在部门耦合和电气化日益重要的情况下。此外,为了评估能源转型期的深刻不确定性,可以应用情景分析之外的技术。对新兴主题影响的明确评估,如对特定技术的社会反对和对清洁能源以外的可持续性指标的认识提高,将为电力市场的长期决策增加价值。最后但并非最不重要的是,应始终确保尽最大努力做到清晰和透明。
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引用次数: 6
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