TUGAS BESAR APLIKASI CFD: '''Two-Phase Simulation in Horizontal Flow Gas-Liquid Separator'''

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Introduction

Petroleum reaches the surface as a mixture consisting of gas and fluid substance. To achieve an adequate quality of petroleum, one needs to satisfy the process of a petroleum refinery, which requires deliberation in multiphase separation. A gas-liquid separator was designed to separate two different substances using a diverter inside the system. To acquire efficient separation, one needs to consider the effective diverter near the system's inlet. This consideration requires a perilous investigation, which numerical modeling would be utilized in achieving the low cost and minimum risk investigation upon the system. In petroleum production, there are several types of separators. The separators are used based on the numbers of phases, crude oil properties, and separator conditions. These are vertical, horizontal, and spherical separators, which are widely used in production. Regarding the lowes cost expense in these separators, the horizontal separator has the lowest ones. This separator is considered as a gravity-based facility that was designed to provide sufficient time for droplets separation. The schematic flow direction of this system will be depicted below to ensure the simplicity of the system.

Figure 1. Horizontal Separator Inner Geometry and Flow Direction

Objectives

In this simulation, there will be various assumptions due to the model limitations. First of all, the model that will be simulated applies for a two-phase separator only. The real case in using the system would be in a three-phase consideration. Second, there would be numerous neglections since the simulation only focuses on the two-phase separation. There would be no other additional phase separators, such as coalescer, vortex breaker, or baffle, widely used in the actual system. The simulation will be limited only focuses on the inlet velocity and separator distance variation to acquire its effectiveness. For further objectives will be mentioned below:

1. To evaluate the effectiveness of the system by comparing the previous simulation with the 2D simulation.

2. To investigate the most efficient separator within several distances from the inlet and various inlet velocities.

3. To investigate the suitable separator with two different inlet positions based on its effectiveness on both outlets.

Numerical Geometry

The geometry would be the same as the previous study by __ and regarding the regulations on oil handling systems. For simplicity in simulation, the geometry would be in two-dimension, and the result's validation will be performed to achieve the similarities from the 3D simulation. The additional internal apparatuses would be neglected and only using the diverter considered in the simulation. This would point out each of the phase separations as perceptible as the post-processor can with acceptable information to a certain condition.

Methodology

Software

The numerical simulation will be using CFDSOF® (for the pre-processing and the processing step), the first Indonesian CFD software established by PT CCIT Group Indonesia, and ParaView as the post-processor of the simulation. ....

Mathematical Model (Verification)

The simulation was solved using the Reynolds averaged Navier-Stokes (RANS), k-ε turbulence model. In order to ease the visualization between phases, the multiphase eulerian method or Eulerian-Eulerian model is being implemented, which attributes separate momentum and continuity equations for each phase. ....

Boundary Conditions and Solver Control

....

Fluid Properties
Fluid Type Density Dynamic Viscosity Mass Flow Rate
Oil .. .. ..
Gas .. .. ..

Simulation Limitations

Regarding the simulation that brought various complexities upon the gas-liquid phase, the effects of gas flashing, foaming, emulsification, and in between phases interactions will be neglected. ....

Results and Discussions

Validation

The simulation will be validated with the previous three-dimensional method by ___, compared to its efficiency and diverter distance from the inlet's system. ...

Conclusions

References

[1] Yayla, Sedat & Kamal, Karwan & Bayraktar, Seyfettin & Oruç, Mehmet. (2017). TWO PHASE FLOW SEPARATION IN A HORIZONTAL SEPARATOR BY INLET DIVERTER PLATE IN OILFIELD INDUSTRIES.

[2] Eissa, M., 2013. Influence of Flow Characteristics on the Design of Two-Phase Horizontal Separators. Journal of Engineering and Computer Science (JECS), 15(2), pp.50-62.

[3] Adeniyi, O., 2004. Development of Model and Simulation of a Two-Phase, Gas-Liquid Horizontal Separator. Leonardo Journal of Sciences, 3(5), pp.34-45.

[4] Kharoua, N., Khezzar, L. and Saadawi, H., 2013. CFD modelling of a horizontal three-phase separator: a population balance approach. American Journal of Fluid Dynamics, 3(4), pp.101-118.

[5] Wilkinson, D., Waldie, B., Nor, M.M. and Lee, H.Y., 2000. Baffle plate configurations to enhance separation in horizontal primary separators. Chemical Engineering Journal, 77(3), pp.221-226.

[6] Efendioglu, A., Mendez, J. and Turkoglu, H., 2014. The numerical analysis of the flow and separation efficiency of a two-phase horizontal oil-gas separator with an inlet diverter and perforated plates. Advances in Fluid Mechanics, 10, p.133.

[7] Stewart, M. and Arnold, K.E., 2011. Surface production operations, Volume 1: Design of oil handling systems and facilities (Vol. 1). Elsevier.