液化石油气自然气化钢瓶中组分变化的模拟计算

SIMULATION OF THE LPG COMPONENT CHANGES DURING THE SPONTANEOUS VAPORIZATION

根据化学相平衡原理、质量守恒定律和实际气体状态方程,建立了液化石油气自然气化过程气相和液相组分变化理论计算的模型,可对多组元LPG自然气化过程中各组分的变化进行准确的计算,同时可计算组分变化引起饱和蒸气压、热值、华白数和燃烧势的变化。

Because LPG generally is a multicomponent mixture of propane, propylene, butane and butylene etc, the mass ratio of each component for gas phase or liquid phase varies during the spontaneous vaporization The mass or volume fraction of each component can be determined by the empirical formula or experimental data only for two component LPG mixture of propane and butane, the variation of other LPG composed with multicomponent must be determined by chromatographic analysis In this paper a model is established to simulate the LPG component mass ratio change during the spontaneous vaporization according to the theory of chemical phase equilibrium, principle of mass conservation and equation of state of real gas Because the model is differential and algebra equations set, a difference equation set is presented Based on the solution the curves are given for the mass fraction variation of each component of any multicomponent LPG mixture in the spontaneous vaporization process and can be used to actual engineering At the same time the analyses are made on the changes of saturation pressure, Warburg's number and combustion potential of LPG caused by the mass ratio change of each component during the spontaneous vaporization