FLASH CALCULATIONS FOR CONTINUOUS OR SEMICONTINUOUS MIXTURES USING AN EQUATION OF STATE
FLASH CALCULATIONS FOR CONTINUOUS OR SEMICONTINUOUS MIXTURES USING AN EQUATION OF STATE
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DOI：
10.1021/i200029a038
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发表时间：
1985-01-01
期刊：
影响因子：
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通讯作者：
PRAUSNITZ, JM
中科院分区：
文献类型：
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作者：
COTTERMAN, RL;PRAUSNITZ, JM
这项工作描述了使用连续热力学执行闪速计算的两个过程。第一个过程称为矩量法，仅提供近似值，因为它并不严格满足所有物质平衡；然而，在某些情况下，这种近似可能非常好。第二个过程称为求积法，使用高效的高斯积分；它不使用分布函数的代数形式，而是在分布变量的选定值处提供闪光问题的精确解决方案。两个过程都用实际例子进行说明，包括流体混合物，其中选定的组分（例如，CO 2 ）被认为是离散组分，而所有其他组分被认为是连续组分；这是半连续的情况。还给出了包含几种同系物（或集合）的流体混合物的计算，例如在石油混合物中发现的，其中集合可以是链烷烃、环烷烃和芳香烃。将使用求积法的计算结果与天然气混合物中相平衡的实验数据进行比较。一致性对于共存相的组成和逆行冷凝过程中的液体产率非常有利。
This work describes two procedures for performing flash calculations using continuous thermodynamics. The first procedure, called the mejthod of moments, provides only an approximation because it does not strictly satisfy all material balances; however, In some cases this approximation can be very good. A second procedure, called the quadrature method, uses efficient Gaussian integration; it does not use an algebraic form for the distribution function but provides exact solutions to the flash problem at selected values of the distribution variable. Both procedures are Illustrated with realistic examples, including fluid mixtures where a selected component (eg, C02) is considered as a discrete component while all others are considered as continuous components; this Is the semicontinuous case. Calculations are also given for fluid mixtures containing several homologous series (or ensembles) as found, for example, in pefroleum mixtures where the ensembles may be paraffinic, naphthenic, and aromatic hydrocarbons. Calculated results using the quadrature method are compared to experimental data for phase equilibria in a natural-gas mixture. Agreement Is very good for compositions of coexisting phases and for liquid yield during retrograde condensation.