Thermodynamic modeling of gas hydrate formation in presence of thermodynamic inhibitors with a new association equation of state

2016 ◽  
Vol 427 ◽  
pp. 328-339 ◽  
Author(s):  
Amir Hossein Saeedi Dehaghani ◽  
Mohammad Hasan Badizad
Keyword(s):  
Equation Of State ◽  
Thermodynamic Modeling ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Gas Hydrate Formation ◽  
New Association

scholarly journals Prediction of Methane and Ethane Gas Hydrate Formation and Their Mixture in a Porous Medium

2019 ◽  
pp. 1-16
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Thermodynamic Modeling ◽  
Gas Hydrate ◽  
Pore Diameter ◽  
Laboratory Data ◽  
Hydrate Formation ◽  
Equilibrium Temperature ◽  
Formation Temperature ◽  
Gas Hydrate Formation

The purpose of this paper is to study the thermodynamic modeling of the conditions for methane and ethane gas hydrate formation and their mixtures in a porous and non-porous environment. In this paper, the Van der Waals- Platteeuw thermodynamic model was used for prediction of gas hydrate formation conditions. Also, the SRK and PTV equations of state were used for calculations of driving force. In this research, the results of thermodynamic modeling in a porous were compared with the non-porous environment and laboratory data in the literature. Studies have shown that the results of the modeling are in good agreement with the laboratory data and the percentage of errors is low. The results also showed that with increasing pressure of porous and non-porous media, the equilibrium temperature increases. In addition, the effect of the pore diameter of porous media on the results of modeling was investigated for methane, ethane and their mixtures during gas hydrates formation. The results showed that by increasing the pressure for any size of the pore diameter of the porous medium, hydrate formation temperature increases. In addition, by increasing the pore diameter of the porous medium, hydrate formation temperature methane, ethane and their mixture increase at a constant pressure. The results also showed that the equilibrium temperature of the non-porous medium is higher than the equilibrium temperature of the non-porous medium. This shows that the hydrate formation in the porous medium has a deterrent effect and leads to lower temperatures and higher temperatures conditions for gas hydrate formation. The results showed that by increasing the percentage of methane in a porous or non-porous medium, the temperature of hydrate formation of the binary gas mixture of methane and ethane decreases.

scholarly journals Thermodynamic modeling of inhibitors’ role in preventing from gas hydrate formation in the pipelines

2015 ◽  
Vol 37 ◽  
pp. 86
Author(s):  
Fateme Sadat Mosavi Kakavand ◽  
Reihaneh Asachi
Keyword(s):  
Thermodynamic Modeling ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Formation Condition ◽  
Acentric Factor ◽  
Specific Flow ◽  
Ambient Temperatures ◽  
Gas Hydrate Formation ◽  
Thermodynamic Conditions ◽  
Two Parameters

The existence of water beside gas has led to the creation of gas hydrate formation phenomenon in these pipelines. The phenomenon causes to basic financial and operational problems in the system. For this reason, the flow purpose of the present study was to simulate the formation condition in a specific flow and thermodynamic conditions and finally to provide the best possible solution to this problem. The Van Der Waals & Plague equation was used to thermodynamic modeling in the terms of temperature and pressure and the computer coding was carried out by MATLAB software. In addition, the results of Green & Perry study were used to utilize from physical characteristics, such as critical temperature, critical pressure, acentric factor and the temperature of quadruple points of elements forming hydrate .the results of this study indicated that increasing the concentration of inhibitor in system at the specified temperature, delay the hydrate formation. Moreover, temperature rising can also increase the effect of solvents. Therefore, two parameters of ambient temperatures in hot seasons or using heaters for pipelines can reduce the risk to a minimum in critical (sensitive) points. Finally, the used model in this design which has had some changes in variables properly can see the needs and meanwhile it is usable for other similar changes by a brief change.

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