Li Xiao

Shallow geothermal energy is considered a kind of competitive renewable energy. The LNG storage tank energy pile technology is to bury the heat exchange tube in the pile foundation to form a primary loop system and to use the shallow geothermal energy. These piles act as an underground heat exchanger and simultaneously carries the structural loads. Under the "Dual-carbon" strategy, it can effectively reduce the carbon emissions and energy consumption of LNG terminal if promoting the application of LNG storage tank energy piles, especially the large-diameter and super-long energy piles, However, research on the large diameter and super-long energy piles as well as their engineering applications is limited in the phases of design methods, construction techniques and testing methods. Hence, a number of 1.2m diameter and 53m long LNG storage tank energy piles were designed and constructed in a LNG terminal for the first time in the industry, which helps to gain the experiences in design, construction and testing of these piles. The bearing capacity, pile integrity, heat exchange efficiency and pipe resistance of two large-diameter and super-long energy piles were quantitatively analyzed. The results demonstrate the feasibility and applicability of this technology, and the findings can serve as a reference for future practical applications.