Abstract:

In order to study the accident consequences caused by leakage of LNG filling stations and whether the coverage rate of existing combustible gas detectors meets the requirements, FLACS three-dimensional simulation software was used to simulate the tank car and unloading pipe, storage tank and gas filling unit of typical LNG filling stations, and the accident influence range caused by fire heat radiation and explosion overpressure after leakage. The detection coverage of existing combustible gas detectors for leaks was assessed. The results show that the heat radiation near the LNG storage tank in the station room and refueling area can reach 25 kW/m² when the LNG tanker and LNG storage tank leak 50 mm, and the radiation intensity leads to casualties nearby. The maximum explosion overpressure near the LNG skid-mounted and tanker exceeds 20 kPa. Through the combustible gas detector coverage assessment, it is concluded that there is no effective detection way for the leakage of the loading and unloading hoses in the west and south directions of LNG filling station.

Key words: liquefied natural gas (LNG) stations, leakage accident, detector coverage, fire radiation, explosion overpressure, combustible gas detector