Of course you will be loading up your regeneration system somewhat. Process simulation an overview sciencedirect topics. Pdf modelling and simulation of glycol dehydration unit of a. Methodology the design and simulation of the natural gas dehydration plant utilized in this work to achieve the desired objectives. Although various process conditions for the dehydration system have been studied, the. I am working in a process design consultant company and currently i am assisting in a project, which involves in designing a new glycol regeneration package together with a new contactor. Since salt is nonvolatile, it will remain in the lean glycol during regeneration as the water is boiled off. Simulation study ibrahim tk1, abdulrahman rk 2, khalaf fh1 and kamal im3 1petroleum engineering department, faculty of engineering, knowledge university, kurdistan, iraq. Principles of glycol dehydration esd simulation training. The wet rich glycol then flows from the absorber to a regeneration system in which the entrained gas is separated and fractionated in a column and reboiler. After absorbing the water from the gas stream, the glycol needs to be regenerated for reuse in the closedloop system. The system was designed using the environmental protection agencyapproved griglycalc computer simulation program with a flashgas separator in the glycol regeneration process. Studio scalechem is used throughout the production profile.
Simulation examines ice, hydrate formation in iran. A case study package of the software was used in the analysis. The regeneration is accomplished in the reboiler and the still column above the reboiler. Check the glycol concentration and the regeneration system adjust if and where necessary. Principles of glycol dehydration this twoday course is designed to provide a comprehensive study of the glycol dehydration process.
The program computes the fourphase properties of production fluids, providing the user with critical information about their system. The heating allows boiling off the absorbed water vapor and the water dry lean glycol is cooled via heat exchange and pumped back to the absorber. A simulation with pipephase and hysys software showed that polyurethane insulation with thermal conductivity of 0. Simulation software are used to ensure efficient salt removal in the mru, and therefore prevent scale. Process simulation of meg regeneration unit utpedia. In this tip of the month totm we study the required stripping gas rate as a function of the lean teg weight percent, reboiler temperature, number of theoretical trays in the stripping section n s and number of theoretical trays in the still regenerator column n r. Im having this problem here with my teg regeneration which i hope to find some solutions.
Ethylene glycol behaviour at low temperature conditions in refrigeration plants introduction the formation of hydrates in natural gas processing facilities and pipelines is a critical problem as it could lead to blocked pipelines and shutdowns and even to the destruction of valuable equipment. Thermodynamic modeling and simulation of natural gas. Modeling and simulation of software developer behavior. Glycol dehydration is a liquid desiccant system for the removal of water from natural gas and natural gas liquids ngl. The amount of saturated water within the gas is affected by the inlet gas temperature and pressure.
By performing rigorous computer simulation of teg regeneration, we have. Models for the most used glycol regeneration processes have been developed in th e process simul ation program with the pr equation of state. Design and simulation of mono ethylene glycol recovery. The course explores the process from several different perspectives, including what the plant is designed to do, how it does it, the design of the equipment, how the process is controlled and safeguarded, and. Hydrate formation in natural gas pipelines can be inhibited by passing thorough monoethylene glycol meg in transportation pipelines. Influence of process operations on voc and btex emissions. Our teg regeneration unit helps remove absorbed water through direct fire or electric heating. The formation of gas hydrates can lead to significant production and safety issues in drilling operations as the solid hydrate material can plug flow lines and equipment. Generally speaking, advanced simulation software like prosimplus enable. Finally, the glycol flows to the stripper where it is regenerated by boiling off the water and returned to the contactor. The process simulation programs proii and promax also have models available recommended for the.
The operating conditions of a meg recovery column can vary depending upon the operating envelope of the. Scalechem is simulation software that calculates scaling problems during oil and gas production. The process flow diagram used for these simulations is shown in figure 1. Simulation and modeling of meg monoethylene glycol regeneration for the estimation of energy and meg losses. Dehydration units are often overdesigned, resulting in high capital or operating costs.
So, simulating the teg regeneration unit of the domestic gas plant consists of two steps. The impact of stripping gas flow rate on triethylene glycol losses. Glycol regeneration removes water from natural gas using teg as an absorbent. In order to ensure design options meet the necessary requirements of saving capital, solvent or energy costs, thermodynamic modeling and a holistic view of operations is needed. The rich glycol leaving the absorber must be regenerated to a high purity so that it can be recirculated to the absorber to continue its dehydration function. Glycol systems are used to reduce the inlet and outlet gas flow water dew point specification. Recovery of monoethylene glycol distillation and the. Therefore, it is a good model to adopt for modeling glycol dehydration processes. Fjords processing currently uses multiscale for the design of mru. Contact ifs today for more information on this package. Simulation and modeling of meg monoethylene glycol. The core process in the regeneration loop is the boiling off of water from the glycol in a reboiler. Simulation of dpf regeneration strategies gtsuite u c fsuite users conference frankfurt a. Influence of process operations on voc and btex emissions from glycol dehydration units michael w.
Natural gas dehydration unit with teg tri ethylene glycol. Design glycol units for maximum efficiency vincente n. Taking into account these parameters the amount of internals for the column are selected, as well as the glycol flow and purity. Glycol regeneration package posted in chemical process simulation. The objective is to reduce the amount of water in the natural gas with teg, used as the extraction solvent. Pdf mathematical models for the prediction of water content, gas and solvent temperatures of the absorber of a natural gas glycol dehydration.
Additionally, simulation software, such as aspen hysys or aspen plus may also be used for the design or evaluation of distillation systems. Investigating the performance of dehydration unit with. Simulation of glycol dehydration unit chemical process. Ifs designed a modular process skid glycol regeneration package to remove water from natural gas using lean waterfree teg as an absorbent. However, this simulation software cannot be integrated with a mass and energy simulation software as oli studio. Glycol dehydration has stood the test of time as the preferred way to remove water from natural gas. Multiple stages of removal are contained on a single skidmounted unit, giving you a wide range of options and flexibility to configure the system to your. Technical challenges and solutions in a closed loop meg. This process is the traditional triethylene glycol teg based dehydration process and represent a unit with gas absorption and extraction solvent regeneration. Improvement of teg regeneration in natural gas dehydration. Dehydration of natural gas ng by absorption is a common industrial. Mono ethylene glycol regeneration process for lng fpso. The majority of the heat load in a regen system is in the heating up of the glycol.
Hysys simulation software and the griglyccalc simulation tools to predict. Glycols typically seen in industry include triethylene glycol teg, diethylene glycol deg, ethylene glycol meg, and tetraethylene glycol treg. Mohammedmodeling and simulation of multiphase system in production well using wellflo r software. The process simulation and optimization of natural gas dehydration process including mono ethylene glycol meg injection and its regeneration process is studied in this research work. For practical and economic reasons, it is necessary to extract and reuse the meg through a regeneration unit which removes hydrocarbons, water and salts. Ethylene glycol behaviour at low temperature conditions in. Absences of meg in transportation pipelines will reduce the hydrate formation and at the same time will increase the quality of natural gas. If salt enters the glycol system with production fluids, either continuously or in periodic slugs, its concentration in the system. In one of these conversion jobs, the water load of the rich teg starts to add up. Meg monoethylene glycol is a hydrate inhibitor used for the recovery of subsea oil and gas. Ifss systems reduce the water present in the natural gas stream to the content of water dew point. Modelling and simulation of glycol dehydration unit of a natural gas plant. This paper presents the progress of current work to modernize simulation software. Glycol regeneration units and teg regeneration packages ifs.
High pressure regeneration of teg with stripping gas. The most popular process simulator software used for dehydration of natural gas is. Simulation and modeling of meg monoethylene glycol regeneration for the estimation of energy. The lack of coldfinger unit in steady state simulation software makes simulation difficult.
The design of glycol systems teg, deg, meg is unique for each application as the overall package design will vary to meet the specified moisture content of the gas at the process conditions. Teg regeneration is the reverse of absorption with teg entering. Design and simulation of mono ethylene glycol recovery unit from effluent waste of morvarid petrochemical companyiran ahmad rasuli1, hamed rashidi1, mortaza khoshvaght1 1 department of chemical engineering, shahrood branch, islamic azad university, shahrood, iran. The rich glycol is preheated through heat exchange with the regenerated glycol and enters the top. This paper discusses the dehydration modeling technology available with aspen hysys in v10 and above. Develop reasonable analysis of teg dehydration performance. While glycalc has been successfully used in industry to calculate benzene emissions in teg units, there are limitations.
Simulation study ibrahim tk 1, abdulrahman rk 2, khalaf fh 1 and kamal im 3 1 petroleum engineering department, faculty of engineering, knowledge university, kurdistan, iraq. Develop accurate plant simulation of gpp using hysys software 2. Pdf process simulation of glycol regeneration sohail. Schlumberger glycol dehydration processes remove water vapor from natural gas, which helps prevent hydrate formation and corrosion. Our glycol regeneration skid for oil and gas reduces the water present in the natural gas stream to the content of water dew point. Scale 2000 and scalesoftpitzer software work as a point simulation. Depending on available resources the appropriate heat source for the boiling process is selected. The economic performance of regeneration process depends on meg losses and the amount of heat and power required. The model is recommended for teg dehydration modeling as it provides.
From hysys simulation, a gas plant was placed under investigation with the aim of studying the effects of variation in glycol flow rates, number of stages 4, 8 and 12 trays of the absorber, reboiler temperature 180oc, 190oc and 200oc and stripping gas rate on the water content of the gas in a glycol dehydration unit in the niger delta. My situation is as follows in hysys example file g2 in dehydration unit stack column has been simulated as a modified distillation column which remove water from rich teg to make lean teg. Simulation and optimization of the utilization of triethylene glycol in. The process conditions used in this simulation are those obtained from the statistic. Technical challenges and solutions in a closed loop meg regeneration system for gas field offshore, uk s. Simulation of other glycol regeneration configurations and technologies can be modeled in hysys, such as drizo and coldfinger 6. V10, aspen hysys can be used to model dehydration with teg, meg and deg. This paper presents the progress of current work to modernize simulation software used in design and. The rich teg must then be regenerated to remove the absorbed water. Glycol dehydrator the glycol dehydration unit is a reliable, efficient system for removing water from natural gas well streams in order to meet typical pipeline and process specifications. Optimization of triethylene glycol dehydration of natural gas.
Analyzing triethylene glycol teg gas dehydration system. For processes requiring gas with very low water dew points, a stripping vapor will most likely be needed to aid the regeneration process. The impact of stripping gas flow rate on triethylene glycol losses from glycol regeneration unit. Furthermore, efficiency is increased by means of heat integration, crossing cold rich glycol with hot lean glycol, resulting in lower operational costs. Process simulation is a modelbased representation of chemical, physical, biological, and other technical processes and unit operations in software 43. Analyzing triethylene glycol teg gas dehydration system performance of a gas processing plant gpp with hysys modeling. Meg is most favorable because it is reusable, increase corrosion protection, and non flammable. Simulation of glycol dehydration unit posted in chemical process simulation. In order to study the impact of stripping gas rate on the lean teg mass percent, the teg regeneration process was simulated using promax 4 software with its soaveredlichkwong srk 5 equation of state eos. The impact of stripping gas flow rate on triethylene. If the gas temperature is increased while in contact with free water, more water vapor will be absorbed by the gas. It is the most common and economical means of water removal from these streams. Check sales gas flow rate and decrease if possible.