Simulation and optimization of the utilization of triethylene glycol in. Technical challenges and solutions in a closed loop meg regeneration system for gas field offshore, uk s. It is the most common and economical means of water removal from these streams. Technical and economic evaluation of triethylene glycol regeneration process using. For me, the concentration of the regenerated target product at the outlet is very, and if you change the package of properties, it changes. Apr 05, 2018 the glycol degradation temperature is also dependent on oxygen content, particulate content and hydrocarbon content of the particular glycol solution. Pdf process simulation of glycol regeneration sohail. Pdf natural gas dehydration using triethylene glycol teg. Sensitivity analysis and simulation of teg dehydration. Usually, the manufacturer gives the operating glycol circulation rate as that which is required. Glycol, any of a class of organic compounds belonging to the alcohol family. Aspen hysys software was used as a simulation tool for the dehydration of the gas using triethylene glycol teg as an absorbent for the removal of water vapour. Dehydration units are often overdesigned, resulting in high capital or operating costs.
Given the empirical nature of the relationship used to model the regenerator in glycalc, it is difficult to make the comparison. Ecomax services provides portable dehy cleaning glycol regeneration to the western canadian energy sector. The results showed that aspen hysys can reasonably predict the dehydration plant performance. Our glycol regeneration skid for oil and gas reduces the water present in the natural gas stream to the content of water dew point. Im having this problem here with my teg regeneration which i hope to find some solutions. Dry glycol flows down the tower from the top, from tray to tray or through packing material.
If salt enters the glycol system with production fluids, either continuously or in periodic slugs, its concentration in the system will increase during each regeneration cycle until. 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. Aug 20, 2014 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 180o c, 190o c and 200o c and stripping gas rate on the water content of the gas in a glycol dehydration unit in the niger delta. Taking into account these parameters the amount of internals for the column are selected, as well as the glycol flow and purity. Propylene oxide is combined with water to produce propylene glycol in a continuouslystirredtank reactor cstr. Download scientific diagram the process flow diagram of the gas dehydration and glycol recovery systems by aspen hysys.
Introduction water vapor is the most common undesirable impurity in gas streams. 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. Furthermore, efficiency is increased by means of heat integration, crossing cold rich glycol with hot lean glycol, resulting in lower operational costs. With the addition of the cubicplusassociation cpa package in v10, aspen hysys can be used to model dehydration with teg, meg and deg. The process flow diagram of the gas dehydration and glycol. Glycol regeneration removes water from natural gas using teg as an absorbent.
The wet gas is contacted with lean glycol in the contactor tower. Chapter 18 of gas conditioning and processing 1 presents the process flow diagram and the basics of glycol units. Dehydration simulation of natural gas by using tri ethylene glycol. Ethylene glycol also called 1,2ethanediol, molecular formula hoch 2 ch 2 oh is a.
Glycol systems are used to reduce the inlet and outlet gas flow water dew point specification. Since salt is nonvolatile, it will remain in the lean glycol during regeneration as the water is boiled off. Megwater vapour liquid equilibrium data fitted to experimental field data. Optimization of natural gas dehydration using tri ethylene glycol was carried out using aspen hysys v8. The models can also be implemented in other process simulation programs and with other vapourliquid. Glycol regeneration for oil and gas chemoxy international. This paper discusses the dehydration modeling technology available with aspen hysys in v10 and above. Glycol regeneration package chemical process simulation. An example of a hysys simulation of a traditional teg dehydration process is given in figure 2. 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. However, the hysys glycol property package was the least accurate of the tested fluid packages typically estimating a lean meg purity significantly less than that found experimentally. Does anyone do a hysys simulation using a drizo concept. After absorbing the water from the gas stream, the glycol needs to be regenerated for reuse in the closedloop system.
In the past years, glycol dehydration plants have been successfully designed using offtheshelf process simulators such as aspen hysys, promax and other similar tools. Glycol recovery our capability in glycol meg regeneration we can take meg with up to 15% ww salt and 65% water. Recovery of monoethylene glycol by distillation and the. The process flow diagram of the gas dehydration and glycol recovery systems by aspen hysys. Glycols typically seen in industry include triethylene glycol teg, diethylene glycol deg, ethylene glycol meg, and tetraethylene glycol treg. The fitted nrtl parameters were then used in the hysys process simulator to perform a process simulation of a natural gas dehydration plant, provided both with a coldfinger water exhauster and a conventional stripping column for triethylene glycol regeneration.
Natural gas dehydrating plant was designed and simulated using hysys software. If the gas temperature is increased while in contact with free water, more water vapor will be absorbed by the gas. If you have ever asked yourself how can i maintain high performance gas dehydration, whilst eliminating external gas consumption and reducing emissions from my glycol regeneration package. 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. The rich glycol then flows to a regenerator, where heat separates the glycol and the water, regenerating the glycol for reuse. Given the empirical nature of the relationship used to. Hysys cpa neqsim proved to be the best suited fluid package for dehydration of natural gas using. The regenerated glycol is pumped back to the absorption column and heat exchanged against the rich glycol and cooling water. The core process in the regeneration loop is the boiling off of water from the glycol in a reboiler. Southern alberta glycol regeneration from ecomax services. Jun 05, 2018 for the love of physics walter lewin may 16, 2011 duration. Design and simulation of mono ethylene glycol recovery unit.
Validation of the cpa property package dehydration units are often overdesigned, resulting in high capital or operating costs. The reactor outlet stream is then fed to a distillation tower, where essentially all the glycol is recovered in the tower bottoms. Ecomax\s process utilizes patented technology to regenerate glycol while simultaneously providing system cleaning, and all completed online without any system interruptions. I do not own this song, all credit and rights goes to the band and the writers.
This work was limited due to financial constraint, difficulty arising from the software used hysys. Technical challenges and solutions in a closed loop meg. The amount of saturated water within the gas is affected by the inlet gas temperature and pressure. 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. Glycol regeneration package posted in chemical process simulation. Hysys peng robinson and hysys glycol had reasonable matches to btex concentration data at regenerator conditions. Mass transfer coefficients for meg distillation calculated. In our glycol dehydration system, wet gas enters a tower at the bottom and flows upward. Based on case studies of the traditional regeneration method with or without. The water vapor exits the top of the regenerator to atmosphere while the lean glycol is recirculated back to the contactor in a recirculating loop. Natural gas dehydration teg glycol by hysys with karwan.
Article pdf available october 2019 with 387 reads how we measure reads a. The regeneration column has a reboiler and a condenser. Pdf process simulation and optimization of natural gas. How to remove water vapour in natural gas dehydration teg glycol by hysys by karwan kamal how to download and install aspen. The term is often applied to the simplest member of the class, ethylene glycol. Methodology the design and simulation of the natural gas dehydration plant utilized in this work to achieve the desired objectives.
Ethylene glycol behaviour at low temperature conditions in. Hysys peng robinson, hysys glycol and glycalc all had a reasonable match to the btex liquidphase concentration data from gpa rr1 at contactor and flash tank conditions. Hysis simulation of propelene glycol formation youtube. Our special bubble cap configuration maximizes gas glycol contact, removing water to levels below 5 lbmmmcf. I have long been trying to adequately assess the atmospheric regeneration of teglycol in aspen hysys.
It offers high purity glycol via a full recycle stripping gas system that. Dehydration using triethylene glycol teg is widely used in natural gas. Glycol dehydration is a liquid desiccant system for the removal of water from natural gas and natural gas liquids ngl. 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. Etablering av simuleringsmodell for det nye konseptet i hysys sammen med. Process simulation and optimization of natural gas dehydration process using aspen hysys. In contrast, the experimentally obtained lean meg purities for trials involving dissolved salts were significantly lower than that reported by the respective simulations. Distribution of hydrate inhibitors in processing of gas. Typically, we recover saltfree meg with 1020% water.
Below is my simple understanding in regard to glycol concentration. 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. 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. We are also capable of producing down to 1% water, if required. Design and construction of a monoethylene glycol regeneration distillation column. Optimization of triethylene glycol dehydration of natural gas.
In many cases the plant feed will contain small quantities of aromatic hydrocarbons that are. Regeneration of the glycol by atmospheric distillation at about 200 c achieves about 1 weight % water in regenerated glycol. The glycol concentration refers to the percentage of water in the glycol and it is regarded as an important process variable which has to be monitored and controlled at all times. In order to minimize glycol degradation in glycol regeneration and reclamation units, reboiler and glycol film i. Some tips on glycol regeneration process simulation. Properties triethylene glycol triethylene glycol 112276 c6h14o4 150.