(480c) Development of a Thermodynamic Model and Multiphase Equilibrium Flash for Prediction of Crystallization in LNG Processes | AIChE

(480c) Development of a Thermodynamic Model and Multiphase Equilibrium Flash for Prediction of Crystallization in LNG Processes


Garcia, F., TOTAL
Bartuel, J. J., Technip
Hirohama, S., AVEVA
Bluck, D., Schneider Electric
Kirchner, M. S., Invensys SimSci-Esscor

Gerek, Nevin Normal Nevin Gerek Ince 2 15 2016-02-24T17:45:00Z 2019-04-11T22:20:00Z 2019-04-11T22:20:00Z 1 369 2106 17 4 2471 16.00

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Development of a thermodynamic model and
multiphase equilibrium flash for prediction of crystallization in LNG processes

Nevin Gerek Ince1,*,
Freddy Garcia2, Jean-Jacques Bartuel3, Seiya Hirohama1,
David Bluck1

text-align:center;tab-stops:.25in">1 line-height:115%;font-family:" times new roman minor-bidi>AVEVA Software

text-align:center;tab-stops:.25in">26561 Rancho Parkway
South, 92630 Lake Forest, California, United States

text-align:center;tab-stops:.25in">2 line-height:115%;font-family:" times new roman minor-bidi>TOTAL

place Jean Millier. 92078 Paris La Défense CEDEX France

text-align:center;tab-stops:.25in">3 line-height:115%;font-family:" times new roman minor-bidi>Technip

Allée de l’Arche

Paris La Défense Cedex France


text-align:center;tab-stops:.25in"> 115%;font-family:" times new roman color:black>*Corresponding/Presenting author: nevin.gerekince@aveva.com

Abstract normal">

layout-grid-mode:char">       Worldwide
production of natural gas is growing, mainly through the development of new
shale gas fields, using hydraulic fracturing. The distance between production
and consumption sites is increasing, making pipeline transmission of natural
gas less economically attractive than liquid phase transportation as Liquefied
Natural Gas, or LNG. In the process of liquefying natural gas, the gas feed has to be cooled to very low temperatures of around 100K or
-173°C to keep the vapor pressure low enough for safe containment. Hydrocarbons
heavier than the main constituents of natural gas, methane, ethane and propane,
even in trace amounts, can result in crystallization in the liquefaction
process. This can lead to plugging and potential damage to expensive equipment,
such as cold-box heat exchangers. Operators of LNG plants want to be able to
push operating conditions as close to the limits as possible, without risking
the formation of solids in the process as feed stream compositions change.

layout-grid-mode:char">       Simulating
LNG productions requires an accurate and robust thermodynamic framework which
can handle solid phase at the cryogenic conditions. For this goal, we gathered
the latest experimental data, and critically examined them. Thermodynamic
models were systematically investigated applying Cubic Equations of State (Soave-Redlich-Kwong in this study), tuning pure component data and binary
interaction parameters and alpha formula considering thermodynamic constraints.
We updated correlations for solid fugacity, and density models. A robust
multi-phase – V(mL)(nS)E - flash algorithm was
established for vapor-liquid-liquid-solid (VLLSE) equilibrium by applying phase
stability analysis. The revamped thermodynamic methods and data allowed us to
accurately predict the multiple phase boundaries that can be present when
cooling a typical natural gas mixture. Simulation results were also compared
against experimentally measured vapor-liquid-solid equilibrium data.