Design glycol units for maximum efficiency bryan research. It is the most common and economical means of water removal from these streams. Glycol dehydration1 heat exchanger water purification. Glycol regeneration removes water from natural gas using teg as an absorbent. Optimization using aspen hysys simulator and optimizer tool. Shawn gipson to perform a good troubleshoot on glycol dehydration equipment, you must know what the system is designed for and how the current conditions compare to that design. Abb control secrl 47 20010619 quality and environment. Natural gas dehydration unit with teg tri ethylene glycol. Remove all packing material from the base and all the kits. Troubleshooting a glycol dehydration system oil and gas. The teg vaporization losses for three feed gas temperatures to contactor for stripping gas rate of 10 std m 3 m 3 teg 1. The operation is the same in that the liquid glycol flows down through the packing and the gas vapor flows up through the packing contacting the glycol. Pdf optimization of triethylene glycol dehydration of.
Teg is then pumped back through the ho t side of the teg teg and ng teg heat exchanger into the top of the contactor. The tower contains a structured packing bed to maximize the mixing between the gas and teg and to increase the contact time between the two substances. Review of design methods for gas dehydration by absorption in teg. Feb 18, 2019 for the love of physics walter lewin may 16, 2011 duration. Glycols typically seen in industry include triethylene glycol teg, diethylene glycol deg, ethylene glycol meg, and tetraethylene glycol treg. Glycol regeneration package teg regeneration skid for. In smaller capacity units dumped packing may be used in the place of trays.
High losses from teg contactor posted in industrial professionals. Rated operational current ie at rating of induction motors at 50 hz order no. If the gas contains free liquid impurities it can be cleaned in a pretreatment ko drum either integrated within the column or an external vessel using a good quality mist eliminator. Another heat exchanger is also added to cool the teg stream to the contactor stream, but for the purpose of this research work a. 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. Feb 19, 2019 for the love of physics walter lewin may 16, 2011 duration. An example of natural gas dehydration, using teg, was built with prosimplus. Low pressure operations at low temperature would probably. Mini contactor terminal style contact minioverload use upper limit combination in part number nonreversing 6 6a a ac coil 24 24v 10 1 no 12 up to 12a m mini 0. They are used in large quantities for the indirect control of motors, valves, clutches and heating equipment. Glycol dehydration unit operation sample clip purchase the complete video at. Contactor must be mounted in the vertical position on a.
Introduction water vapor is the most common undesirable impurity in gas streams. The usual practice is to introduce, at the top of the glycol contactor tower, a solution of regenerated glycol with a concentration ranging from 97 to 99 %, and to remove the solution from the base of the contactor tower at a glycol concentration of 80 to 90 %8. Dimension drawings available on filedimension drawings available on file pdf, dwg and dxf format the abb offer. Radfrac is used to model contactor, stripper and regenerator. Glycol dehydration is a liquid desiccant system for the removal of water from natural gas and natural gas liquids ngl. The dehydration of natural gas is an integral part of many gas processing applications. 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. The teg contactor, after absorbing moisture is regenerated using two columns the stripper and the regenerator. An optimized teg contactor design, when determined in the early project stage, will bring significant weight, space, and cost savings.
Power contactors contactors power contactors 3 pole lmx power mini lmnx lmo lml 4 pole lmcx control relays auxiliary contactors lmx0 mini lmn0 definite purpose contactors lcapacitor duty mpx lsingle pole mr features l lentire mnx range is ul listed lspares available for entire range lmx mini contactors provide a unique blend of compactness and convenience lnewly introduced mo. In this report the simeasuring units are used with the exception of pressure that are given in bar and temperature which is in centigrade. Abb control secrl 2 20010619 the abb range of a the abb range of a contactorscontactors a 9, a 12, a 16 a 26, a 30, a 40 a 50, a 63, a 75 a 95, a 110 a145, a185 a210, a260, a300 af400, af460 af580, af750. The regeneration is accomplished in the reboiler and the still column above the reboiler. The teg contactor can be either structure packing or bubble cap trays. Technical and economic evaluation of triethylene glycol. Teg triethylene glycol is the primary solvent used in gas processing industry to dehydrate gases. Dry teg contacts the moist natural gas and absorbs the water from it in a contactor tower. This example illustrates a process to remove water from natural gas using triethylene glycol teg as dehydration solvent.
The cd is inserted between the report and the appendix. The glycol, usually teg, enters at the top of the contactor and absorbs water. The closed transition contactorbased ats is designed to. Ifss systems reduce the water present in the natural gas stream to the content of water dew point. Abb library is a web tool for searching for documents related to abb products. This work dehydration of natural gas using triethylene glycol teg as. Optimization of natural gas dehydration using triethylene. The teg process the water saturated gas feed enters the gasglycol contactor column in the bottom section via a suitable vapour distributor.
Ifs designed a modular process skid glycol regeneration package to remove water from natural gas using lean waterfree teg as an absorbent. Natural gas dehydration using triethylene glycol teg article pdf available in petroleum and coal 564. This study aims to improve the performance of this dehydration unit to meet sales. In the stripper, moisture is removed from teg by heating generally employing a reboiler. The gasfield was discovered by amoco in 1982 with first gas produced in 1993. Watermethanevocshaps to atmosphere rich teg fuel gas. Manage teg liquid and corrosion in sales gas pipelines. Pdf natural gas dehydration using triethylene glycol teg. If the gas contains free liquid impurities it can be cleaned in a pretreatment ko drum either integrated within the column or an. It lies in the united kingdom continental shelf blocks 229, 2210a and 2214a.
I dont think having an integral vaporliquid separator below the contactor is the most reliable system. Dehydration with triethylene glycol teg is effective. If structured packing is used here it should be designed for a maximum fs of 2. Until 2009, the field was operated by bp formerly amoco. 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. According to their rating, contactors are classified into the following. Troubleshooting a glycol dehydration system is a bit more nuanced but the authors quote pretty much forms the basis for the process. Provisions are also provided for up to 2 no and 2 nc auxiliary contacts. Abstract a report is presented on natural gas dehydration performance of dehydration units in two different plants using a preinhibited glycolantifoamph adjuster blend versus neat glycol with periodic injection of antifoam and ph adjuster inhibi. Estimating teg vaporization losses in teg dehydration unit. Teg, because some quantities of teg has been lost during the dehydration. Fraction of water removed versus teg circulation rate n 1 theoretical trays, 4 actual. Optimize glycol circulation rates flash tank separator fts installation electric pump installation.
Ul file number e1491, guides nldx2 and nldx8 csa certified components. All kocken teg gas dehydration units are constructed according to the api 12gdu specification for glycoltype gas dehydration units, gpsa section buy api 12gdu. Improving gas dehydration using preinhibited glycol onepetro. Pump is installed to raise the pressure of the teg stream before it enters the contactor streams. Contactor relays contactor relays contactor relays are often used in control and regulating functions. Control relays auxiliary contactors type mx0 805 805 805 805 805 1025 1025 1025 1025 1025 m. Optimizing effective absorption during wet natural gas. Decreasing contactor temperature could increase performance. Dehydration using triethylene glycol teg is widely used in natural gas processing to avoid corrosion and plugging of the flow lines. Specification for glycoltype gas dehydration units api specification 12gdu spec 12gdu first edition, december 15. At low temperature and high pressure, the glycol absorbs more light hydrocarbons, decreasing the solvent viscosity. Glycol gas contactor an overview sciencedirect topics.
The generated data from hysys is modeled using a regression approach. The field is black oil and produces around 40kbpd and 220 mmscfd gas. Contactor relays 52 contactors dil, overload relays z 58 contactors dil 514 overload relays z 520 zeb electronic overload relay 523 zev electronic motorprotective system 526 thermistor overload relay for machine protection emt6 533 cmd contactor monitoring device 536. Cells having cther dimensions may be used, provided suitable. A new contactor range from abb new generation abb contactors. 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. During the process, fresh lean teg enters to the absorption column at the top side. 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. Pdf the evolution of glycol contactors researchgate. Most of the liquid free water associated with extracted natural gas is removed by simple separation methods at or near the wellhead. The enriched teg then continues into the internal heat exchanger, which is incorporated at the top of the still column in the regeneration section of the absorption unit. The rich teg must then be regenerated to remove the absorbed water. Optimize glycol circulation and install flash tank.
Taha engineering group teg was established in the year 1989 as constructors with an aim to serve the nation professionally in the fields of civil, electrical, mechanical and lpg engineering. It also depends on factors like fault withstand current, coil voltage and so on. This figure indicates that as the contactor temperature increases, the. For the love of physics walter lewin may 16, 2011 duration. Quick, manual calculation estimates amount of benzene absorbed in glycol.
The lean teg is then sent through an energyexchange pump back to the gas contactor, and the cycle repeats. Ratings of a contactor are given according to the pole of the contactor. The rich glycol is preheated through heat exchange with the regenerated glycol and enters the top. Most dehydration units are designed for a loss of less than 1 pound of glycol per million standard cubic feet of natural gas treated, depending on the teg contactor operating temperature. This figure indicates that as the contactor temperature increases, the teg vaporization loss from the regenerator top increases.
This is a dacron316ss composite mesh pad designed specifically for teg dehydration service. Maurice stewart, ken arnold, in gas dehydration field manual, 2011. 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 teg is then circulated through a reboiler where the absorbed water, methane, and vocs are boiled off and vented to the atmosphere. Gas dehydration station with triethylene glycol teg. Gas dehydration station with triethylene glycol teg july 2011 basic configuration. The dehydration of natural gas by any means is done primarily to prevent the formation of.
In this paper, comprehensive data analysis of the potential root causes that aggravate undesired glycol losses degradation and offspecification products will. Smith 2 describes how glycol contactor normal operating ranges can be extended from 50140f to temperatures as low as 31f. The issue is that losses from the bulk contactor are particularly. Teg or diethylene glycol deg is used to remove the presence of water in the.
The inlet temperature of teg is generally kept at 25 o c to 40 o c as higher temperature lowers the absorption capacity of the teg. Glycol dehydration1 free download as powerpoint presentation. Linear and quadratic models were generated and the best model with high r square value was selected. The base of the lighting contactor see figure 1 has provisions to accept power poles at positions 1 to 6. Simulation on aspen dehydration of natural gas using teg. High losses from teg contactor industrial professionals.
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. Teg contactor for gas dehydration fenix offers complete process. Lean regenerated glycol is introduced into the top of the column via a suitable liquid distributor to ensure a good flow of teg across the entire column area. The moisture in teg is further soaked by recycling a small quantity of dry gas generated in the first column.
Kcc has a track record dating back 30 years and was a leading international supplier of teg gas dehydration plants. Contactor control unit solenoid fitted with varistor 3rt10 3x. The contact medium in the glycolgas contactor may be valvetype trays or bubble cap trays. Dehydration systems 46 contactor c301 the glycol contactor figure 43 is a steel column with upper and lower chambers. Our glycol regeneration skid for oil and gas reduces the water present in the natural gas stream to the content of water dew point. Teg contactor manufacturers in pune, teg contactor. The everest gasfield is located in the central north sea, 233 kilometres 145 mi east of aberdeen, scotland.
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