Abstract: With the acceleration of urbanization and industrialization in China and the increasing demand for environmental protection, the natural gas industry is developing rapidly and the utilization of LNG cold energy has become an important research direction. However, the utilization of cold energy is often constrained by various factors such as small scale and low utilization rate. To address this situation, this paper explores an innovative model for large-scale and long-distance cold energy coupling utilization by examining a case study of the thermal energy interchange station jointly established by a Sinopec LNG receiving terminal and an ethylene project. The project LNG cold energy for cooling petrochemical units and product separation, achieving cascading energy coupling. Technically, the approach employs as an intermediate medium for long-distance cold energy transportation and as a high-precision heat exchange medium, enabling cold energy application across temperature grades. This facilitates the full integration of LNG cold energy with waste heat from petrochemical units. Operational results demonstrate that the project implementation only reduced production costs for the LNG receiving terminal, also effectively lowered the overall energy consumption and carbon dioxide emissions of the ethylene project. It has achieved world's largest-scale utilization of LNG cold energy with long-distance cold energy transportation, significantly expanding the cold energy service radius. This provides reference value for advancing large-scale cold energy coupling development.

Key words: utilization of cold energy, cold-thermal energy interchange station, energy coupling