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Colloque / Séminaire

Séminaire CETHIL - Compressed gas energy storage: the Canadian context

Le 22 octobre 2020

Amphithéatre Laura Bassi (ex. Amphi Lespinasse), Campus de la Doua, INSA Lyon

Langue / language: the presentation will be in English

Présenté par : Prof. Sébastien PONCET, Université de Sherbrooke, Canada

Prof. Sébastien PONCET, Université de Sherbrooke, Canada

Résumé au format pdf

The integration of renewable energy sources results in significant imbalances between electricity production and consumption as well as problems related to the flexibility and reliability of grid operations. Electrical energy storage technologies turn out to be the key element to address these challenges. This is even more important in the Canadian context. In some provinces, electricity prices may fluctuate wildly within the same day and there are also remote communities in the North of the country relying only on diesel engine. Such technologies could be then very attractive to both reduce the cost of electricity and increase the penetration rate of renewable energy while reducing fuel energy consumption.
Trigenerative compressed air energy storage (T-CAES) systems are one of the promising technologies, exhibiting real benefits when placed close to the energy demand. In collaboration with IMT Atlantique, a combined thermodynamic/experimental approach has been preferred to investigate the combined influence of some operating parameters on the performances of different T-CAES. The best overall configuration is then optimized based on techno-economic criteria for small-scale systems (<500 kW). Using existing technologies, the maximum round-trip electrical efficiency remains low at about 19%, mainly because of the exergy losses in the throttling valve during discharge and the low component efficiencies at a micro-scale. However, it could be competitive with electrochemical batteries in terms of investments cost at long terms, especially when accounting for the free-cost of cooling and heating energy production.
The last part of this seminar will cover the possible improvements of T-CAES by adding either supersonic ejector as a mixing device during the discharging process or vortex tubes in cascade used to lower the exergy losses due to the throttling valve. One will end with a short discussion on an equivalent system working with CO2, whose main advantage is to lower drastically the storage volume required.