scholarly journals Numerical Simulation of an Industrial Absorber for Dehydration of Natural Gas Using Triethylene Glycol

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Kenneth Kekpugile Dagde ◽  
Jackson Gunorubon Akpa
Keyword(s):  
Numerical Simulation ◽  
Natural Gas ◽  
Water Content ◽  
Niger Delta ◽  
Divided Difference ◽  
Triethylene Glycol ◽  
Industrial Plant ◽  
Matlab Code ◽  
Exit Temperature ◽  
Plant Data

Models of an absorber for dehydration of natural gas using triethylene glycol are presented. The models were developed by applying the law of conservation of mass and energy to predict the variation of water content of gas and the temperature of the gas and liquid with time along the packing height. The models were integrated numerically using the finite divided difference scheme and incorporated into the MATLAB code. The results obtained agreed reasonably well with industrial plant data obtained from an SPDC TEG unit in Niger-Delta, Nigeria. Model prediction showed a percentage deviation of 8.65% for gas water content and 3.41% and 9.18% for exit temperature of gas and liquid, respectively.

Water Equilibrium in the Dehydration of Natural Gas With Triethylene Glycol

1973 ◽  
Vol 13 (05) ◽  
pp. 297-306 ◽  
Author(s):  
A. Rosman
Keyword(s):  
Natural Gas ◽  
Water Content ◽  
Triethylene Glycol ◽  
Dew Point ◽  
Plant Performance ◽  
Water Removal ◽  
Dewpoint Temperature ◽  
Offshore Production ◽  
Lower Temperature ◽  
Offshore Production Platforms

Abstract To develop reliable design data for glycol contactors, gas-liquid equilibria in the system water-methane-triethylene glycol (TEG) were investigated experimentally. Equilibrium values vary little at the very high TEG concentrations used in modern contactor design, but increase significantly with increasing water concentration in the contacting TEG, and with increasing equilibrium temperature. Various methods of data correlation are described and compared with experimental data. The correlation provides the means for extending the results of this investigation to other pressures and temperatures. Introduction Water removal is a fundamental operation in natural gas processing. Hydrate formation, corrosion, and the formation of liquid water that might separate in the transmission lines are some of the problems caused by an excess of water in the gas. Of the methods available for gas dehydration, water absorption is by far the most generally used. Glycols, especially triethylene glycol (TEG), are the preferred absorbents. A survey of the literature on the water dew point of natural gas over glycol solutions reveals point of natural gas over glycol solutions reveals significant disagreements. A sampling of published dewpoint data for gas in equilibrium with TEG (Fig. 7) illustrates the prevailing confusion. Scant, but still contradictory, information was published for glycol concentrations in excess of 99.8 weight percent. Data in that range are needed in designing percent. Data in that range are needed in designing modern glycol contactors where the water dewpoint temperature must be reduced by more than 100 deg. F. The main reason for discrepancies in experimental results is the difficulty of measuring accurately very small amounts of water in gas. Water is easily adsorbed on the surfaces of experimental apparatus. Normally acceptable data scatter looms large in relation to the low water concentrations that must be measured. Attempts to establish water dew points on the basis of plant performance have been points on the basis of plant performance have been more successful. However, accuracy is limited by the difficulty in establishing the relative contribution of various factors that interrelate in plant operation. plant operation. Faced with these doubts, contactor designers have chosen to provide for TEG circulation rates that are overly high so as to insure more than adequate water removal. Such a practice is undesirable, however, where space and power are at a premium, as on offshore production platforms. Thus, the range of this investigation was governed by the need to extend equilibrium information to the contact temperatures and TEG concentrations necessary m optimize glycol contactors on offshore production platforms. production platforms. New procedures were developed for sampling and analyzing very small concentrations of water in gas and in TEG. To avoid experimental difficulties encountered by previous authors, equilibrium was reached and samples were taken under dynamic conditions. Experimental equilibrium results were smoothed and correlated by several methods. Thermodynamic equations were used to check on the internal consistency of data and to calculate equilibrium constants at conditions outside the range of the investigation itself. The White expression, fitted to the COFRC experimental data, adequately describes the results within the range of temperatures and concentrations studied. DEFINITIONS AND METHODS At water dewpoint temperature, the water contained in a natural gas reaches saturation. Part of that water will condense if the gas is brought to a lower temperature or to a higher pressure. Thus, the "dewpoint temperature" describes the water content of the gas. When dewpoint gas contacts TEG, the water content of the gas decreases. The lower water content corresponds to saturation water at a lower temperature; that is, the dew point will be lower. The initial dewpoint temperature is the contacting temperature. The temperature corresponding to the lowered water content is the equilibrium dewpoint temperature, and the difference between the two temperatures is the dewpoint depression. SPEJ P. 297

Predicting Water Content of Sweet Natural Gas – Hydrate Systems

2016 ◽  
Author(s):  
V. J Aimikhe ◽  
O. F Joel ◽  
S. S Ikiensikimama ◽  
S Iyuke
Keyword(s):  
Natural Gas ◽  
Water Content ◽  
Gas Hydrate ◽  
Natural Gas Hydrate

Numerical simulation of coupled liquid water, stress and heat for frozen soil in the thawing process

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Wei Xiao ◽  
Enlong Liu ◽  
Xiao Yin ◽  
Guike Zhang ◽  
Chong Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Water Content ◽  
Coupled Model ◽  
Frozen Soil ◽  
Water Migration ◽  
Overburden Pressure ◽  
Content Type ◽  
Thawing Process ◽  
Sample Water ◽  
The One

PurposeThe purpose of this paper is to perform the thermo-hydro-mechanical (THM) numerical analysis in order to study the thawing process for frozen soil and to predict the thawing settlement.Design/methodology/approachA new one-dimensional multi-field physical coupled model was proposed here to describe the thawing process of saturated frozen soil, whereby the void ratio varied linearly with effective stress (Eq. 10) and hydraulic conductivity (Eq. 27b). The thawing process was simulated with different initial and boundary conditions in an open system with temperature variations. The mechanical behavior and water migration of the representative cases were also investigated.FindingsThe comparisons of representative cases with experimental data demonstrated that the model predicts thawing settlement well. It was found that the larger temperature gradient, higher overburden pressure and higher water content could lead to larger thawing settlement. The temperature was observed that to distribute height linearly in both frozen zone and unfrozen zone of the sample. Water migration forced to a decrease in the water content of the unfrozen zone and an increase in water content at the thawing front.Research limitations/implicationsIn this study, only the one-directional thawing processes along the frozen soil samples were investigated numerically and compared with test results, which can be extended to two-dimensional analysis of thawing process in frozen soil.Originality/valueThis study helps to understand the thawing process of frozen soil by coupled thermo-hydro-mechanical numerical simulation.

scholarly journals 3D pore-type digital rock modeling of natural gas hydrate for permafrost and numerical simulation of electrical properties

2018 ◽  
Vol 15 (1) ◽  
pp. 275-285 ◽  
Author(s):  
Huaimin Dong ◽  
Jianmeng Sun ◽  
Zhenzhou Lin ◽  
Hui Fang ◽  
Yafen Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Electrical Properties ◽  
Natural Gas ◽  
Gas Hydrate ◽  
Natural Gas Hydrate ◽  
Digital Rock

scholarly journals Numerical Simulation of Turbine Expander in Natural Gas Pressure Energy Power Generation System

2021 ◽  
Vol 2005 (1) ◽  
pp. 012142
Author(s):  
Zhan Zhixing ◽  
Mao Yanqin ◽  
Wang Xiaoyue ◽  
Li Chaojie ◽  
Cai Liang
Keyword(s):  
Numerical Simulation ◽  
Power Generation ◽  
Natural Gas ◽  
Gas Pressure ◽  
Generation System ◽  
Power Generation System
Sign in / Sign up

Export Citation Format

Share Document