Design and construction of a monoethylene glycol regeneration distillation column. Glycalc has been the software of choice for regulatory agencies in north america with respect to estimating benzene emissions from glycol dehydration units. The most popular process simulator software used for dehydration of natural gas is hysys, promax and proii. Some tips on glycol regeneration process simulation. Simulation and optimization of the utilization of triethylene glycol in. 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. Hysys peng robinson and hysys glycol had reasonable matches to btex concentration data at regenerator conditions. Validation of the cpa property package dehydration units are often overdesigned, resulting in high capital or operating costs.
The dehydration of natural gas is very essential in the gas processing industry to remove water vapor. Guide to fpso topside process modules fabrication ifs. I do not own this song, all credit and rights goes to the band and the writers. Process conditions of 92bar and 30c and gas flow rate of 10mmscfd, were inputted into. Simulation and modeling of meg monoethylene glycol. In the past years, glycol dehydration plants have been successfully designed using offtheshelf process simulators such as aspen hysys, promax and other similar tools. A simulation with pipephase and hysys software showed that polyurethane insulation with thermal conductivity of 0. The rich glycol solution leaves from the bottom of the tower stream 15 and flows through the throttling valve to decrease the pressure to 1.
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. Griglycalc and aspentechs hysys are simulation tools. Design and simulation of mono ethylene glycol recovery unit. Analyzing triethylene glycol teg gas dehydration system performance of a gas processing plant gpp with hysys modeling. While still sufficient for many applications, today improved models are often required to predict the fate of trace elements. The generated data from hysys is modeled using a regression approach. Sales gas specification from buyer typically required processed gas with small amount of water to avoid pipelines corrosion, avoid hydrates formation in the gas and for their immediate industry consumption. Simulation examines ice, hydrate formation in iran. In our glycol dehydration system, wet gas enters a tower at the bottom and flows upward. Technical challenges and solutions in a closed loop meg. Simulation of real world field data using aspen hysys and aspen plus. It is usually produced saturated with water vapor under production conditions. The rich glycol is preheated through heat exchange with the regenerated glycol and enters the top.
The models can also be implemented in other process simulation programs and with other vapourliquid. Recovery of monoethylene glycol by distillation and the. Optimization of triethylene glycol dehydration of natural gas. In aspen hysys v10, experience added amine solvents, expanded glycol dehydration options, and new unit operations in the sru. The reactor was modeled in hysys as a generic conversion reactor using conversion and selectivity data from the article kinetics of hydrogenolysis of glycerol to propylene glycol over cuznoal2o3 catalysts by zhou et al. Our glycol regeneration skid for oil and gas reduces the water present in the natural gas stream to the content of water dew point. With all units optimally specified during the process, the lean teg inflow rate was varied with the water content in the dry gas product stream of the contactor column.
Develop accurate plant simulation of gpp using hysys software 2. 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. The different teg regeneration methods were implemented in aspen hysys, a widely used process simulator in the oil and gas industry, with the glycol package, based on the twusimtassone tst cubic equation of state. V10, aspen hysys can be used to model dehydration with teg, meg and deg. Process conditions of 92bar and 30oc and gas flow rate of 10mmscfd, were inputted into the software and simulated. Technical and economic evaluation of triethylene glycol. Develop accurate plant simulation of gpp using hysys software.
The different teg regeneration methods were implemented in aspen hysys, a widely used process simulator in the oil and gas industry, with the glycol package, based on the twusimtassone tst. Due to lack of available information from the gpp, it can be covered by accurate estimation of process integration software called hysys. As zoobie has noted, the glycol package may already have selected the activity coefficient model and the associated interaction parameters for you. Benzene emissions calculations for teg units by glycalc and. Employ seamless, integrated tools for costing, energy management, safety analysis and equipment design.
Most appropriate fluidthermo package for tegmegwater. Gas processing plant gpp converts gas reservoirs raw natural gases to produce sales gas, which is high price commodity in the market. Optimization of natural gas dehydration using triethylene. I have long been trying to adequately assess the atmospheric regeneration of teglycol in aspen hysys. Six different teg flowrates were used for the simulation. A traditional teg dehydration process has been simulated using the pengrobinson equation of state 9. 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. Universiti teknologi petronas, seri iskandar,tronoh,perak. Design and simulation of mono ethylene glycol recovery. Simulation of gas dehydration on an fpso using aspen hysys. This paper discusses the dehydration modeling technology available with aspen hysys in v10 and above. The impact of stripping gas flow rate on triethylene. Pdf sensitivity analysis and simulation of teg dehydration. Technical challenges and solutions in a closed loop meg regeneration system for gas field offshore, uk s.
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. Commercial process simulation programs used for glycol dehydration are aspen plus, aspen hysys, proii and. A case study package of the software was used in the analysis. Natural gas dehydration using triethylene glycol teg. Recovery of monoethylene glycol distillation and the. For practical and economic reasons, it is necessary to extract and reuse the meg through a regeneration unit which removes hydrocarbons, water and salts. To learn more about the basics of the hysys interface, see chapter 1 interface in the user guide.
The regeneration process releases these vocs, and a btex benzene, toluene, ethyl benzene, and xylene control system is used to condense and recover these vocs for safe disposal. Monoethylene glycol meg is an important raw material having numerous research and industrial applications. Aspen hysys has historically employed the glycol property package for teg. Design glycol units for maximum efficiency vincente n. Griglycalc is a windows application developed in the late 1990s by the gas research institute gri and is primarily used for the estimation of emissions from glycol regeneration units. The regeneration column has a reboiler and a condenser. Teg regeneration is the reverse of absorption with teg entering. Model the lifecycle from design through operations for faster troubleshooting, online performance monitoring and realtime optimization. The wet gas feeds the contactor d200 stream 1 at 71 bar gage. However, glycol losses is behind some technical problems in the dehydration process. 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. A water content of 58 ppm was specified in the dehydrated gas. We simulated the proposed configuration in which the flash gas was routed to glycol regenerator as a stripping gas agent.
In this tip of the month totm, the effect of stripping gas rate on the regenerated lean teg concentration for several operation conditions will be studied. The impact of stripping gas flow rate on triethylene glycol. Empower decision making with the improved accuracy. Removal of this water from the gas stream is necessary to protect downstream equipment from damage and prevent hydrate formations. The process flow diagram of the gas dehydration and glycol recovery systems by aspen hysys. Optimization of natural gas dehydration using tri ethylene glycol was carried out using aspen. Our special bubble cap configuration maximizes gas glycol contact, removing water to levels below 5 lbmmmcf. Natural gas dehydrating plant was designed and simulated using hysys software. Propylene oxide is combined with water to produce propylene glycol in a continuouslystirredtank reactor cstr. It is the most common and economical means of water removal from these streams. Griglycalc uses peng robinsonuniquac for the calculation of equilibrium in glycol systems. Mass transfer coefficients for meg distillation calculated. Develop reasonable analysis of teg dehydration performance.
Dehydration process optimization asset optimization software. The impact of stripping gas flow rate on triethylene glycol losses. Process simulation for revamping of a dehydration gas. Aug 15, 2018 meg monoethylene glycol is a hydrate inhibitor used for the recovery of subsea oil and gas. Simulation examines ice, hydrate formation in iran separator. With the addition of the cubicplusassociation cpa package in v10, aspen hysys can be.
Glycol dehydration is a liquid desiccant system for the removal of water from natural gas and natural gas liquids ngl. Na values in the griglycalc column indicate that the application failed to calculate the phase split at the lts conditions. On the basis of analyzing the process flow and parameters of dew point control system, utilizing the hysys software to establish the simulation model, and combining the experimental analysis, the eight aspects of ethylene glycol injection concentration and injection volume, reboiler temperature, light hydrocarbon entering ethylene glycol. Hysys by natural gas engineering program dehydration cycle unfinished problem. Optimization of natural gas dehydration using triethylene glycol. For me, the concentration of the regenerated target product at the outlet is very, and if you change the package of properties, it changes. Pdf process simulation of glycol regeneration sohail.
Natural gas dehydration unit with teg tri ethylene glycol. Analyzing triethylene glycol teg gas dehydration system. At the end of the regeneration loop, the lean teg feeds the top part of the contactor stream 16 and absorbs water. 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. The effect of nitrogen stripping rate on teg losses from glycol regenerator tower, teg lean wt. The regeneration is accomplished in the reboiler and the still column above the reboiler. Utilising hysys simulation package software, chukwuma and jacob 4. 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. Pdf natural gas dehydration using triethylene glycol teg. Chapter 18 of gas conditioning and processing 1 presents the process flow diagram and the basics of glycol units. Additionally, simulation software, such as aspen hysys or aspen plus may also be used for the design. Property package in hysys posted in chemical process simulation.
The formation of gas hydrates can lead to significant production and safety issues in drilling operations as the solid. Design and simulation of mono ethylene glycol recovery unit from effluent waste of morvarid petrochemical companyiran ahmad rasuli1. To do so, aspen hysis simulation software has been used to design and optimize the process of separating glycols from watersalt solutions. The objective of this experiment is to carry out a simulation on teg dehydration unit using aspenhysys process software. The research is aimed at simulation the prospective gas dehydration process using aspen hysys simulator. Glycol regeneration removes water from natural gas using teg as an absorbent. Sensitivity analysis and simulation of teg dehydration unit in central rumaila compression station in basrahiraq. Regeneration of the glycol by atmospheric distillation at about 200 c achieves about 1 weight % water in regenerated glycol. Natural gas streams produced by the wells or extracted from storage reservoirs often contain large amounts of water vapour. The regenerated glycol is pumped back to the absorption column and heat exchanged against the rich glycol and cooling water. The reactor outlet stream is then fed to a distillation tower, where essentially all the glycol is recovered in the tower bottoms. This is important in an fpso since the removal of water from natural gas is necessary before processing, and due to the fact that natural gas from the reservoir contains large amount of water which can cause several problems.
Kasravand custom designs glycol regeneration packages to recondition glycol used for processes such as hydrate inhibition and gas dehydration. This work was limited due to financial constraint, difficulty arising from the software used hysys. Pdf process simulation and optimization of natural gas. The results clearly indicate that the glycol property package in hysys consistently predicts a much higher hydrocarbon absorption in the rich glycol stream compared to other calculation methods. Nevertheless, in the following article process simulation of glycol regeneration, models for all the glycol regeneration processes have been developed in the process simulation program hysys with the peng robinson equation of state. Given the empirical nature of the relationship used to model the regenerator in glycalc, it is difficult to make the comparison. Dry glycol flows down the tower from the top, from tray to tray or through packing material. With the addition of the cubicplusassociation cpa package in v10, aspen hysys can be used to model dehydration with teg, meg and deg. Workflows are tested and improved to complement a process engineers workflow.
The pengrobinson pr model and the twusimtassone tst model the glycol package in aspen hysys are used. Due to lack of available information from the gpp, it can be covered by accurate. Natural gas is an important energy source among other sources of fossil fuels. A mei designed dehydration unit, as a part of your gas processing project, will insure safe and reliable operation, while providing the most cost effective solution. Ethylene glycol behaviour at low temperature conditions in. My understanding is that hysys does provide regressed binary interaction parameters for glycol systems for wilson, nrtl, or uniquac. This column absorbs a part of the water in the gas in the triethylene glycol teg mixture. We obsereved that the water moisture in dry gas stream can be maintained wit. Schlumberger glycol dehydration processes remove water vapor from natural gas, which helps prevent hydrate formation and corrosion.
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