Speaker
Description
Liquid Air Energy Storage (LAES), characterized by its large-scale energy storage capacity and geographical flexibility, represents a promising solution to address the intermittency and volatility of renewable energy. In the construction phase of a LAES power station, the pre-cooling procedure for the cold energy storage fluid and its corresponding tank assumes critical significance, as it profoundly impacts both the round-trip efficiency and the overall economic viability of the station. Traditionally, the liquid-phase cold energy storage method employs a methanol-water solution and propane as the cold energy storage fluid. However, direct injection of the low-temperature cold energy storage fluid into the tank can lead to excessive stress, potentially compromising the tank's integrity. Hence, it is crucial to pre-cool the methanol-water solution tanks, propane tanks, liquid air tanks, and their associated pipelines to the appropriate temperatures prior to fluid injection. This paper proposes the use of liquid nitrogen spraying for tank cooling and evaluates the impact of various cooling rates on tank stress levels. A tank pre-cooling calculation model is subsequently developed to analyze the effects of ambient temperature, external wind speed, and pre-cooling rate on liquid nitrogen consumption. Taking into account the influence of cooling rate on thermal stress and liquid nitrogen usage, the paper provides a recommended pre-cooling rate range for storage tanks.
| Submitters Country | China |
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