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Calculation of vapour-liquid equilibrium for LPG based on three-parameter equation of state

B. Zhao


LPG tank is a main device that uses in industrial and civil field, and it is dangerous under fire because LPG is a flammable and explosive gas, therefore it is important to analyze the thermal response rules of LPG under fire, the vapor-liquid equilibrium of LPG should be studied in depth.
The three-parameter equation of state and the Van Der Waals mixing rule are used in analyzing the mass and energy conversion of gas and liquid phase LPG in tank. A new three-parameter equation of state is proposed, the corresponding simulation of vapor and liquid phase equilibrium is applied in this research. Simulation results show that the new three-parameter equation of state can obtain the higher precision. The critical isotherm of LPG under fire is calculated, the relationship between c_Z and r_T is obtained, and the effect of c_Z on AAD% to predict the gas pressure, vapor volume, and liquid density is also obtained.


Three-parameter equation of state, LPG, gas and liquid phase;

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