Modeling of Two‐Phase Flashing Flow of Multicomponent Mixtures in Large Diameter Pipes

Abstract

A two-phase flashing flow model is developed to predict the distributions of pressure, temperature, velocity and evaporation rate in a transfer line, which is a typical example of a two-phase flow pipe in the petrochemical industry. The model is proposed based on the pressure drop model and the multi-stage flash model. The results indicate that pressure drop, temperature drop, and change of evaporation rate mainly occur in the transition section and the junction site of the transfer line. The predictions of the model have been tested with reliable field data and the good agreement obtained may lead to a better understanding of the twophase flashing flow phenomenon, as well as demonstrating the feasibility of applying the model into the design and optimization of pipelines.

Computational Fluid Dynamics Simulation of Internal Compressible Flow in Transfer Lines and Structural Optimization

“…Due to a lower pressure drop in the transfer line, the lower medium outlet temperature for the tubular furnace guarantees no overheating of radiant tubes. 30 The comparison results of the pressure distribution between the improved transfer line and the original structure based on Qin et al's proposed method 9 are shown in Figure 15. While ensuring that the inlet and outlet diameters and positions of the vacuum transfer line remain unchanged, the total pressure drop of the transfer line decreases from 19.39 to 12.25 kPa, approximately 36.8%.…”

“…It can be observed that using their method can be considered a contribution to solving practical industrial cases. Qin et al developed a two-phase flashing flow model to predict the distributions of pressure, temperature, velocity, and evaporation rate in a transfer line. The model is proposed based on the pressure drop model, and the multistage flash model and the model have been verified with reliable field data.…”