Abstract: Liquefied hydrocarbon is a Class A fire hazard liquid. Once it leaks, it will cause serious consequences when encountering the ignition source. In order to effectively prevent the gas leakage of liquefied hydrocarbon storage tanks, this paper takes a petrochemical liquefied hydrocarbon tank farm as an example, using FLACS software to simulate the leakage of liquefied hydrocarbon and the distribution of flammable vapor clouds. The gas detector layout plan is evaluated, and an optimized plan is proposed. The results show that the coverage rate of combustible gas detectors under the original layout plan is 46.88%, the optimized arrangement of combustible gas detectors for liquefied hydrocarbon tank farms has a 1ooN coverage rate of 96.87%, which can provide technical support for early warning of leakage accidents.

Key words: liquefied hydrocarbon tank farm; CFD; scene analysis method; detector coverage evaluation