Pdf the dehydration unit of a plant that processes natural gas uses. One of the most prominent hardwares used for mass transfer is tray. The next step toward standardization is to integrate heat exchanger design into a simulation software like aspen hysys. Also to determine the proper amount of the teg to be used in other not to flood the contactor absorber with it and avoid liquid carry over.
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. The process simulation programs proii and promax also have models available recommended for the. The numbers of flowpaths of liquid on tray are 1, 2, 3 or 4 as per liquid capacity requirement of column. The type of fluid package selected is pengrobinson package. Subsea natural gas dehydration with membrane processes.
Psv sizing for contactor tower in teg dehydration zoobie chemical 10 jan 06 09. The gas industry has experienced encouraging worldwide growth in the last few decades and is poised to play an even more important role in the worlds energy future, in tandem with the growth of interest in renewable and alternative energy resources. While all of these are viable processes, absorption with teg was chosen because it can adequately remove the amount of water needed and is easier to simulate in aspen hysys. Griglycalc and aspentechs hysys are simulation tools frequently. The regeneration is accomplished in the reboiler and the still column above the reboiler. Natural gas dehydrating plant was designed and simulated using hysys software. 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. 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. Teg circulation rate, numbers of theoretical trays in the absorber and the.
Simulation study ibrahim tk1, abdulrahman rk 2, khalaf fh1 and kamal im3 1petroleum engineering department, faculty of engineering, knowledge university, kurdistan, iraq. The impact of stripping gas flow rate on triethylene glycol. The inlet temperature of teg is generally kept at 25oc to 40oc as higher temperature lowers the absorption capacity of the teg. This stage of design converts process requirements into actual hardware. Natural gas dehydration using triethylene glycol teg. Case study ii low temperature heating medium to 24ha202 hysys model figure 6. Answer added by hari gattu, process manager, hysys software 1 year ago we can select the component in hysys which is not present in the. Optimization using aspen hysys simulator and optimizer tool was performed to minimize the processing cost considering different sets of parameters. Natural gas dehydration unit with teg tri ethylene glycol. While other solvents besides teg are available, teg is the most common choice and generally is effective forde, 2008. This was the only serious flaw discovered in proii, making it better suited than both hysys gp and hysys pr, which provided inaccurate results for respectively wet gas water content and dry gas water dew point. The goal for the membrane contactor is to dehydrate the natural gas to transport pipeline specifications, which are.
Glycol dehydration is a liquid desiccant system for the removal of water from natural gas and natural gas liquids ngl. The proposed subsea natural gas dehydration process is illustrated in fig. This is also a constant considering a gal of teg as the basis. Membrane contactor for subsea natural gas dehydration. To find the condenser duty assume 25% reflux ratio. The teg contactor can be either structure packing or bubble cap trays. Using hysys simulation software and hand calculation, designed a natural gas processing plant to process 500mmscf of sour natural gas from the. A mathematical model of a membrane contactor using triethylene glycol teg for dehydration of natural gas at subsea operation conditions has been developed. Results obtained shows that between a teg rate of 53lhr and 70lhr, the water content is between acceptable range. Once the process design stage ends, the equipment design begins. The lean teg is then sent to the teg circulation pumps, which pumps the teg to the contactor through an air cooler and richlean glycol heat exchangers.
In particolare pu o essere applicato sia per sistemi a stato stazionario che per sistemi dinamici. 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 contactor is simulated with four theoretical stages and the sizing is carried out using aspenplus v12. Teg circulation rate, numbers of theoretical trays in the absorber and the stripping gas column, feed gas. It is generally assumed that as the glycol circulation increases, the teg purity will also remain constant. In figures 3 through and 8 we have reproduced the co 2 and h 2 s solubility on volumetric basis of scfgallon of teg solution or scmm 3 of teg solution for pressures of and 500 6897 and 3448 kpa representing contactor pressure, and 50 psia 345 kpa representing the flash separator in a typical teg dehydration unit. Dehydration using triethylene glycol teg is widely used in natural gas processing to avoid corrosion and plugging of the flow lines. Glycalc has been the software of choice for regulatory agencies in north. Design optimization of heat exchangers in topside systems for.
So, in the field, 10 f approach is tough and 20 is doable. V10, aspen hysys can be used to model dehydration with teg, meg and deg. Modelling of natural gas sweetening and dehydration processes. It is the most common and economical means of water removal from these streams. Proii and hysys cpa dtu provided low reboiler duties. Case study iii removal of scrubber and superheater unit before teg contactor 1 hysys model figure 6.
A bar g bar a psig psia atm g atm abs kpag kpa abs. Alberto started his career as production engineer with bayer and then spent ten years in academia as research scientist and lecturer. Stream teg feed absorbs most of the water in the gas to contactor stream. Solubility of acid gases in teg solution campbell tip of. 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. Contactors tesys d schneider electric south africa. Benzene emissions calculations for teg units by glycalc and.
Teg contactor approach to equilibrium chemical plant design. Manage teg liquid and corrosion in sales gas pipelines. Calculation of fire case relief requirement for teg gas contactor zhangsteve chemical 21 feb 05 10. The process flow diagram of the gas dehydration and glycol recovery systems by aspen hysys. Hysyspeng robinson and hysysglycol had reasonable matches. Before entering the contactor, the gas is passed through an inlet separator where entrained droplets of liquid are removed from the gas stream. Teg used as an aqueous absorbent to absorb water from gas streams. A regenerator is required to drive off the water vapor from the spent teg so it can be recycled to the contactor tower for further gas dehydration. At 30 degrees, that is like falling off a log backwards, easy. The use of simulation software such as hysys, vmg sim, prosim. Aspen hysys and promax are commonly used process modelling and simulation software in gas dehydration 1618 as well as other gas. The impact of stripping gas flow rate on triethylene glycol losses.
Hysyspeng robinson, hysysglycol and glycalc all had a. From a capacity viewpoint, a liquid rate greater than 6 gpm inch of weir weir loading, is the rate at which a higher number of flow paths should be considered. Hysyspeng robinson, hysysglycol and glycalc all had a reasonable match to the btex liquidphase concentration data from gpa rr1 at contactor and flash tank conditions. In addition to the topside dehydration facility, injection of hydrate inhibitor such as monoethylene glycol meg or methanol is commonly used to prevent hydrate formation from the reservoir to the topside treatment facility gpsa. The gas industry has experienced encouraging worldwide growth in the last few decades and is poised to play an even more important role in the worlds energy future, in tandem with the growth of interest in renewable and alternative energy. Introduction water vapor is the most common undesirable impurity in gas streams. The simulation model is developed on aspentech hysys 3. I dont think having an integral vaporliquid separator below the contactor is the most reliable system. Five different teg flow rates were used for the simulation. With the addition of the cubicplusassociation cpa package in v10, aspen hysys can be used to model dehydration with teg, meg and deg.
An example of natural gas dehydration, using teg, was built with prosimplus. The gas then enters a glycol contactor equipped with either structured packing or bubble cap trays. How do you over ride the divergence in teg dehydration contactor simulation in hysys simulation of teg dehydration unit in aspen hysys answers 3 followers 3 views 194 vote count 1 answer 3. Optimization of triethylene glycol dehydration of natural. Pdf natural gas dehydration using triethylene glycol teg. Dehydration units are often overdesigned, resulting in high capital or operating costs. Contacted the protreat support several times and always got a helpful reply in time. The generated data from hysys is modeled using a regression approach. The problem is i dont know the contactors theoretical stage number. Aspen hysys has historically employed the glycol property package for teg. Simulation and optimization of natural gas processing plant. Sep 02, 2011 stream teg feed absorbs most of the water in the gas to contactor stream. The rich teg stream from the absorber bottoms rich teg is heated to 220 f by the hot lean teg from the regenerator regen bttms, and is fed to the stripper column for regeneration. The natural gas dehydrating plant was designed and simulated using hysys software with process conditions of 6200kpa and 300 c and gas flow rate of 10mmscfd were inputted into the software and simulated.
Radfrac is used to model contactor, stripper and regenerator. The rich teg teg with the absorbed water is regenerated before it is reused as lean teg in the glycol contactor. Calculation of fire case relief requirement for teg gas. Simulation and optimization of the utilization of triethylene glycol in. While glycalc could be used for this purpose, hysys can be automated to make the task much simpler. The two models calculate similar lean teg purity, teg circulation rate and stripping gas rate in order to obtain the same level of dehydration, c. Dehydration using triethylene glycol teg is widely used in natural gas. Dehydration process optimization asset optimization software. Dehydration and acid gas column improvement with aspen hysys. Please some one can help me to establish a simulation with hysy 3. From expanding capacity to troubleshooting columns, engineers can turn to column analysis, the acid gas cleaning package, and the dehydration modeling in the continually enhanced aspen hysys for topn.
Hysys peng robinson and hysys glycol had reasonable matches to btex concentration data at regenerator conditions. What does a true standard condensate stabilizer look like. Psv sizing for contactor tower in teg dehydration chemical. Tray columns are widely used in various types of mass transfer operations. Most dehydration projects involve either absorption or adsorption technology. 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. This work was limited due to financial constraint, difficulty arising from the software used hysys. Process ecology reduces emissions in natural gas glycol dehydration facilities using aspen hysys james holoboff process ecology 2. Browse our products in contactors for tesys d contactors and reversing contactors up to 150a for inductive motor and 250a for resistive loads. Chemical provision is given to the suction line of the pumps to control the ph of lean glycol by injecting a base and or a corrosion inhibitor and to stop foaming in the contactor 11. The interesting points of this example lie in the use of the absorption module for the contactor model and in the representation of two columns connected in series the teg regenerator and the teg stripper by a single prosimplus stripper module. Optimization of triethylene glycol dehydration of natural gas. Although teg is recyclable, it is usually lost in the system due to vaporization and carryover, which results in economic issues.
The problem is i dont know the contactor s theoretical stage number. Process ecology reduces emissions in natural gas glycol. The concentration of the lean glycol entering the top of the contactor is the main variable that determines the water dew point specification that can be made. Glycols typically seen in industry include triethylene glycol teg, diethylene glycol deg, ethylene glycol meg, and tetraethylene glycol treg. How to remove water vapour in natural gas dehydration teg glycol by hysys by karwan kamal how to download and install aspen technology v9 hysys with karwan kamal s. Case study iii removal of scrubber and superheater unit before teg contactor 2 hysys model. Design optimization of heat exchangers in topside systems. Dehydration process involves removing water from natural gas. This was a key factor in winning two 2 recent projects. 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. Condenser duty is the heat of vaporization times 25% which will be equal to 0. The impact of stripping gas flow rate on triethylene glycol losses from glycol regeneration unit.
Depending on the application, meis process design is based on promax or hysys software, will limit plot and height of the dehydration unit, and limit the volume of gaseous vocs emissions. The natural gas dehydrating plant was designed and simulated using hysys software with process conditions of 6200kpa and 300c and gas flow rate of 10mmscfd were inputted into the software and simulated. This was related to low calculated heat capacities of teg. Therefore heat of vaporization per gal of teg 970 btulb h2o 1 lb h2o 3 gal of teg 323 btugal. Optimization of natural gas dehydration using triethylene. A failure of the seals between the glycol contactor and the vaporliquid separator can result in losses of teg, which would be hard to trouble shoot. The most popular process simulator software used for dehydration of natural gas is hysys, promax and proii. The rich glycol is preheated through heat exchange with the regenerated glycol and enters the top. Chapter 18 of gas conditioning and processing 1 presents the process flow diagram and the basics of glycol units. In 1999 he joined hyprotech aspentech in calgary as product manager for conceptual design software tools and thermodynamics. Technical and economic evaluation of triethylene glycol.
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