The Experts below are selected from a list of 15 Experts worldwide ranked by ideXlab platform
Emdadul Haque - One of the best experts on this subject based on the ideXlab platform.
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Ethylene Glycol Regeneration Plan: A Systematic Approach to Troubleshoot the Common Problems
Journal of Chemical Engineering, 2013Co-Authors: Emdadul HaqueAbstract:Mono Ethylene Glycol (MEG) is used primarily at low-temperature processing plant for extracting natural gas liquids. Typically a physical process plant comprises with gas dehydration system which allows for physical separation of water satuRated gas by simple dew point depression and water condensation brought about by chilling from cross exchange with propane refrigerant. The resultant wet gas is prevented from freezing by injection of liquid desiccants to inhibit hydRate formation. The resulting dehydRated gas stream will have a dew point preciously equal to the satuRated water volume of the gas at its coolest temperature. Mono Ethylene Glycol has been chosen as hydRate inhibitor because of its low volatility, low toxicity, low flammability, good thermodynamic behavior, and simple proven technology requirement and availability. But it has two common characteristic problems in regeneration plant that is fouling of equipment by iron carbonate, Ca+2/Mg+2 salt deposits and cross contamination of MEG and condensate contamination. MEG in condensate causes condensate specification problems, fouling of condensate stabilization equipment and contamination of wastewater streams. Condensate in MEG causes stripping effect due to condensate vaporization, lower operating temperature, higher MEG purities, and contamination of wastewater streams from MEG Regeneration system and burping of column due to condensate buildup. Another common problem is Glycol losses due to carryover with dehydRated gas and which finally accumulates in pipelines and causes corrosion. Other reasons of Glycol losses are higher column temperature, foaming, leaks at pump or pipe fittings, opeRated with excessive gas flow Rates and rapid changes in gas flow Rates. Column Flooding occurred if feed Glycol Circulation Rate exceeded design limit and it does not allow proper separation of Glycol and water separator and much Glycol losses through vent line. This paper presents an experimental study of Glycol losses. Effort has been made to investigate the causes and the study suggests some mitigation plans. Current study suggests the efficiency of the dehydration process depends on a large extent on the cleanliness of the Glycol and the regular monitoring of Glycol parameters such as Glycol concentration, hydrocarbon content, salt content, solids content, pH stabilization, iron content, foaming tendency etc. Losses due to vaporization from reboiler can be minimized by adjusting operating parameters. By developing monitoring procedure and periodic maintenance about 90% operating problems of Glycol Regeneration Plant can be reduced. DOI: http://dx.doi.org/10.3329/jce.v27i1.15853 Journal of Chemical Engineering, IEB Vol. ChE. 27, No. 1, June 2012: 21-26
Alireza Bahadori - One of the best experts on this subject based on the ideXlab platform.
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Design of Glycol Unit for Maximum Efficiency in Gachsaran Oil Field
SPE Latin American and Caribbean Petroleum Engineering Conference, 2003Co-Authors: Alireza BahadoriAbstract:In designing dehydration units for natural gas, several critical parameters exist which can be varied to achieve a specified dew point depression. This paper studies the effects of varying the Glycol flow Rate, number of stages in the contactor,. The presence of heavy ends (C7+). Water and hydrocarbons are natural companions. Hydrocarbons are formed in water environment and are in equilibrium with water. The water content of a gas depends on system pressure and temperature and the composition of the water containig gas. The presence of heavy ends (C7+) effects the water capacity of gas. In this study the effects of Glycol Circulation Rate, Glycol concentration and C7+ mol fraction are evaluated in a dehydration system. This paper presents optimization of dehydration units. The results provide an analysis of the dehydration effectiveness at a variety of common operating variables for a typical dehydration facility. Next, the effect of c7+ in the plant feed will be presented
Lek Yan Leong - One of the best experts on this subject based on the ideXlab platform.
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Simulation and Optimization of the Utilization of Triethylene Glycol in a Natural Gas Dehydration Process
Chemical Product and Process Modeling, 2017Co-Authors: Zykamilia Kamin, Awang Bono, Lek Yan LeongAbstract:AbstractThe dehydration unit of a plant that processes natural gas uses triethylene Glycol (TEG) as an absorbent to remove water from the gas to prevent blockages in pipes due to the formation of hydRates. Although TEG is recyclable, it is usually lost in the system due to vaporization and carryover, which results in economic issues. Therefore, it is necessary to optimize the dehydration process to achieve the allowable water concentration in the gas, to minimize the use of energy, and to minimize the loss of TEG. Experimental set was designed using Design Expert software by utilising data from Farashband gas processing plant, Iran and subsequently, fed to ASPEN HYSYS to construct and simulate the dehydration process. The chosen affecting parameters to the process were the (1) lean Glycol Circulation Rate, (2) the temperature of the reboiler, and (3) the number of trays in the contactor column. Whereas, the response parameters included the (1) amount of Glycol that was lost, (2) the reboiler duty, (3) the concentration of water in the dry gas, and the (4) temperature at which the hydRate formed. Then, these data were optimized using the response surface methodology (RSM). The results indicated that the optimum conditions within the experimental range conducted in this study of process parameters chosen, of the lean Glycol Circulation Rate, the temperature of the reboiler, and the number of trays in the Glycol contactor column for the gas dehydration process for the plant were 3944 kg/hr, 180 °C, and three trays, respectively.
Mohammad Reza Rahimpour - One of the best experts on this subject based on the ideXlab platform.
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Mitigation of BTEX emission from gas dehydration unit by application of Drizo process: A case study in Farashband gas processing plant; Iran
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Majid Saidi, Mahboubeh Parhoudeh, Mohammad Reza RahimpourAbstract:Abstract As greenhouse gas emissions have became a concern to the entire natural gas industry, it is always balanced with the obligation of reasonable investment levels and production costs. According to environmental regulations, emission of aromatic compounds and other hazardous materials from this process is a challengeable issue. In the natural gas dehydration process, Glycol solvents use to remove water from the natural gas stream in order to meet the pipeline quality standards. Farashband gas processing plant consists of six dehydration units opeRate using stripping gas injection. In this study, to mitigate the BTEX compounds emission Rate in the Farashband gas processing plant, two alternatives based on the Drizo process for solvent regeneration are proposed. In the first technique, application of a single Drizo process in each dehydration unit is investigated and in the second, use of a complex Drizo process instead of three sepaRated single Drizo processes is suggested. These alternatives aim to minimize environmental disadvantages and improve the most important operating parameters such as dry gas water dew point temperature, Glycol loss and Glycol purity. Simulation results indicate that TEG as dehydrating agent has a better performance with respect to DEG. Single Drizo process shows the most significant change of water dew point followed by complex Drizo process and conventional stripping gas dehydration process. Also in the case of Drizo process, the water content of natural gas reduces with increasing the reboiler operating temperature from 180 °C to 200 °C. Although the BTEX emission Rate in three single Drizo processes is lower than a complex Drizo process, economic evaluations represented that the additional total capital investment decreased from 2.406 million$ to 1.365 million$ using the complex Drizo process instead of three single Drizo processes. Also investigation of different solvents showed that though n-Heptane has the best performance among different solvents, use of the recycled BTEX compounds as a solvent, not only reduces the BTEX emission Rate, it decreases the additional costs. Also data analysis represents that by considering this fact that the BTEX emission Rate enhances with increasing Glycol Circulation Rate, the optimum TEG Circulation Rate for both single and complex Drizo processes is approximately 4 (gal TEG/lb water).
Zykamilia Kamin - One of the best experts on this subject based on the ideXlab platform.
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Simulation and Optimization of the Utilization of Triethylene Glycol in a Natural Gas Dehydration Process
Chemical Product and Process Modeling, 2017Co-Authors: Zykamilia Kamin, Awang Bono, Lek Yan LeongAbstract:AbstractThe dehydration unit of a plant that processes natural gas uses triethylene Glycol (TEG) as an absorbent to remove water from the gas to prevent blockages in pipes due to the formation of hydRates. Although TEG is recyclable, it is usually lost in the system due to vaporization and carryover, which results in economic issues. Therefore, it is necessary to optimize the dehydration process to achieve the allowable water concentration in the gas, to minimize the use of energy, and to minimize the loss of TEG. Experimental set was designed using Design Expert software by utilising data from Farashband gas processing plant, Iran and subsequently, fed to ASPEN HYSYS to construct and simulate the dehydration process. The chosen affecting parameters to the process were the (1) lean Glycol Circulation Rate, (2) the temperature of the reboiler, and (3) the number of trays in the contactor column. Whereas, the response parameters included the (1) amount of Glycol that was lost, (2) the reboiler duty, (3) the concentration of water in the dry gas, and the (4) temperature at which the hydRate formed. Then, these data were optimized using the response surface methodology (RSM). The results indicated that the optimum conditions within the experimental range conducted in this study of process parameters chosen, of the lean Glycol Circulation Rate, the temperature of the reboiler, and the number of trays in the Glycol contactor column for the gas dehydration process for the plant were 3944 kg/hr, 180 °C, and three trays, respectively.