Scientists simulated different storage systems for liquid air energy, whereby the efficiency of the return between configurations with liquid natural gas (LNG), solar and stirling engines and further optimized performance is compared with the help of particle canopy methods.
A research team led by scientists from China has investigated the integration of the Stirling Engine, LNG and Zonne energy in a LAES system for storing Liquid Air Energy). With the help of Aspen Hysys and Matlab, the group have modeled and optimized different combinations of those components.
“A Laes system with 3 compressors and 3 expander stages is assumed as a basic case for the study in this article. An organic Rankine cycle (ORC) is used to restore the excess compression of the 3C+3rd LAES system. The optimized round trip -efficiency ( “Based on this, various thermal energy repair systems and external heat sources and sinks are integrated to improve the RTE of the LAES system.”
With the help of Aspen Hysys, the team combined a LAES system with a Stirling engine to restore excess compression strlek during discharge. In the LNE’s system registered by LNG, the Cold Energy of LNG used for cooling during air compression and liquefactie. The inlet temperature was -151.1 C and the exhaust temperature was -141 C.
The team also evaluated a laes integrated with solar energy, using thermal energy energy to stimulate the ability during discharge. They assumed solar radiation of 850 W/m².
“The algorithm of the particle swarming optimization (PSO) is used to obtain the optimum RTE or economic performance for different laes systems,” the group explained. “There are two ways to find an optimal condition for this system: (1) consider the solar energy as a heat -input in the RTE calculation, or (2) take into account the economic profit of the solar energy storage system. Although the energy -efficiency can be improved with a large amount of solar energy and the yielding would also be the gultery -energy. be an optimal value for the investment costs. “
According to the results, the optimized traditional return efficiency (RTE) of the Stand-Alone Laes-S-System is 68.20%, or 3.20 percentage points higher than that of the Basic Laes-Orc system. When LNG Regasification replaces water as a cooling body, the optimized traditional RTE rises from 68.20% to 73.79%. Among all LAES systems studied, the Solar-Laes-S-System reaches the highest traditional RTE at 173.5% when it is optimized with regard to energy.
“Het is efficiënter om het LNG -regasificatieproces rechtstreeks te gebruiken door bij te dragen aan luchtvloeibaarmaking in de koude doos en om de luchttemperatuur te verlagen vóór compressoren in het laadgedeelte (102,80%) dan beperkt te worden om te fungeren als een koellichaam voor de stirlingsmotor met behulp van surplus compressiewarmte (73,79%) wanneer vergelijkbare hoeveelheden LNG Cold Energy said, the team said that the LAES-SE-S-SE RTEs (69.18%), followed by the solar energy, said by the solar energy that has directly Heated Lae’s (59.93%) (58.49%). “
They presented their results in “Improving return efficiency (RTE) in storage of liquid air energy through integration with external thermal energy sources“Which was recently published in Computers and chemical technology. The research was conducted by scientists from China XI’an University of Science and TechnologySinopec Engineering Incorporation (SEI), the Southwest Petroleum University, XI’an Jiaotong University and Norwegian University of Science and Technology (NTNU).
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