Design and analysis of combined Liquid Air Energy Storage(LAES)and Organic Rankine Cycle(ORC)system
Liquid air energy storage(LAES)is a kind of cryogenic energy storage(CES)technology which uses off-peak electricity to liquefy air and store the electrical energy in the form of liquid air.LAES technology offers the advantages of relatively large volumetric energy density and ease of storage.This paper concerns the thermodynamic modelling and analysis of combined liquid air energy storage(LAES)and Organic Rankine Cycle(ORC)process.The whole system consists of a charging unit,a discharging unit and a heat recovery and storage unit.Organic Rankine Cycles are established in both charge and discharge units.In the charging cycle,a modified Claude cycle(Heylandt cycle)is chosen for the liquefaction of air in off-peak times.In the discharging cycle,liquid air is pumped to high pressure and evaporated and superheated,the stored energy is extracted by the expansion process at peak hours.The charge and discharge units are combined cycles which integrates Organic Rankine Cycles to recover the maximum amount of energy from the fluid.By using heat recovery and storage cycle,the integration between charge unit and discharge unit stores hot energy from compression in liquefaction mode to reuse it in recovery mode.In the organic Rankine cycles,the excess heat of compression is used as a heat source to power the ORC,whereas the air or refrigerant acts as a heat sink to offer cold energy,leading to the production of additional electricity.Based on the Aspen HYSYS simulation software,the performance of the LAES system at various operating conditions is investigated.Compared with many existing hybrid LAES systems which combine ORC cycles and cold/heat recovery and storage cycles,the system proposed have the advantages of simpler configuration and higher energy efficiency.It turns out that the LAES system has a relatively high round-trip efficiency,yield to 55.05%,due to the more effective use of the heat of compression.The results show that the proposed configurations might play an important role for power systems balancing in the future.
CES LAES liquid air energy storage process simulation
Jingxuan XU Wensheng LIN
Shanghai Jiao Tong University,Institute of Refrigeration and Cryogenics
国际会议
武汉
英文
530-539
2018-08-21（万方平台首次上网日期，不代表论文的发表时间）