Abstract: To explore the accident risk of leakage in multiple areas for a comprehensive energy station, an analysis model of multiple leakage scenarios for a comprehensive energy station was constructed using FLACS software. First, the leakage scenarios where leakage might occur in the comprehensive energy station were identified, and the specific condition parameters of the possible leakage scenarios were determined in combination with accident cases and the layout of the comprehensive energy station. Then, the leakage consequence analysis was carried out for different leakage scenarios. The results showed that the volume and diffusion distance of the gas leakage in the hydrogen production area and the hydrogenation area were mainly affected by the leakage pressure. The leaked dangerous gas cloud in the hydrogen production area was prone to spreading to the LNG area. Once an ignition source explodes, it was easy to cause a domino effect, threatening the safety of the LNG area. When the LNG leakage aperture reached 50 mm, the leaked LNG was easy to form a liquid pool on the ground, and the combustible gas cloud would migrate to the hydrogen production area under the influence of the wind field. Once an explosion occurred, it would affect the safety of the equipment operation in the hydrogen production area. Some suggestions were provided to mitigate the consequences of leakage accidents in multiple areas for different leakage scenarios.

Key words: comprehensive energy station, combustible gas diffusion, leakage accident, numerical simulation