Improvement potential of Cryogenic Energy Storage systems by process modifications and heat integration. (15th April 2021)

• Record Type: Journal Article
• Authors: Dutta, Rohan; Sandilya, Pavitra
• Is Part Of: Energy. Volume 221(2021)
• Publication Date: 2021-04-15
• Subjects: Cryogenic Energy Storage -- Rankine cycle -- Claude cycle -- Multi-stage turbine -- Organic Rankine cycle -- Pre-cooling; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2021.119841
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: Cryogenic Energy Storage (CES) system is currently gaining significant attention in the field of large-scale energy storage systems. This is because this system can provide high energy-density during storage and uses air or nitrogen that are available at no or a low cost. Moreover, the technology has matured and can be used on-site in a decoupled manner. The CES system has three sub-processes, namely, charging or liquefaction, storage, discharging or power cycle. To investigate the improvement potential of such systems, state-of-the-art configurations for each sub-processes have been analyzed in this paper. A configuration consisting of a multi-stage turbine expansion, a turbine and a JT-valve connected in series at the liquefaction stage, Organic Rankine cycle for utilization of heat of compression, and a four-stage reheat Rankine cycle with thermal energy storage at cryogenic temperature has been proposed. The study suggests that a high turnaround efficiency (about 90%) of the process may be achieved by an appropriate external source of thermal energy. Highlights: Presents a novel process configuration of liquefaction cycle of a CES system. Found 90% turnaround efficiency of the configuration with 500°C waste-heat. Modification includes pre-cooling, two-stage turbine, JT-turbine at last stage. ORC system was used for utilizing heat of compression in liquefaction cycle.