Numerical investigation of a liquidgas ejector in marine. How to size liquid motive eductors for pumping liquids. Estimates can be used if it is understood that these may cause some problems if the estimated value is lower than the actual vapor pressure of the liquid. Investigations on mass transfer in bubble columns with. Jet pumps, also referred to as ejectors, are devices f the conveyance, compression mixing of gases, vapours, liquids or solids in. However, for higher pressure ratios, compressibility effects need to be taken into account. Above a critical pressure ratio between primary and secondary around 1. The high pressure motive liquid enters the motive chamber of the eductor through a converging motive nozzle. These range from offtheshelf solidsconveying, liquid, and gas jet eductors to highly qualified flow controls for spacecraft, energy research, and advanced product development projects. Keywordsworking fluid, cooling system, operating conditions ejector design, area ratio.
Higher gas velocities swept most of the liquids 140 psi pressure drop at the wellhead. It is easy to operate, durable and generally troublefree because there are no moving parts. A procedure for calculating gas ejectors springerlink. An ejector is a type of fluid machinery that uses working fluids with high. Design of vacuum systems for crude oil vacuum tower. T he ejector computer model includes the following. Mathematical model of ejector and experimental verification jakub archalous 1. Delivery behaviour liquid jet vacuum ejectors can extract gases and vapours and compress them. Recycling of gas from the discharge side of the gas ejector back into the suction low pressure side incorporation of an integral hp gas regulating assembly which varies the motive fluid consumed. Product catalog gea engineering for a better world.
The application of ejector technology to subsea fields of the. The design of the ejector is critical for applications which involve the. Design of vacuum systems for crude oil vacuum tower distillation d. The objective of ejector design is to produce intense mixing between the primary. All jrg jt nozzles for eductors ha\esmooth flow paths. Gas liquid jet pumps are widely used due to their diversity of assembly choices, artless design, and absence of moving parts1. Hydrodynamic characteristics of gasliquid ejectors.
Ejector design calculation, ejector dimensions, generate. Although design and construction may vary, this applies to all jet pumps. Gas holdup and energy dissipation in liquidgas ejectors. They are very useful for applications when expensive process fluid is to be recovered. Technology plot space required system power system capital cost liquid ejector 18m. Aug, 2009 results obtained from an analysis of the most widespread and commonly used procedure for calculating gas ejectors equipped with a cylindrical mixing chamber are presented. Our company culture was formed by our origins in the 1960s as designers and manufacturers of specialized, flightqualified venturi hardware for spacecraft applications. Fox liquid eductors made in usa fox venturi products. The design of the nozzle varies depending upon expansion ratio, state of fluid and type of the ejector. It is to be emphasized that the ejector is probably one of the most foolproof, trouble. At the eductor nozzle, the pressure energy of the motive liquid is converted into a high velocity jet. Jet liquid pump gas jet liquid pump steam jet liquid pump liquid. Liquid jet ejectors are specially designed to operate using water, solvent or any other clear liquid and generate vacuum corresponding to the vapor pressure of the liquid. Therefore ejector curves at fixed ejector geometry are calculated at the design discharge pressure and an increased discharge pressure see 3.
The applications for specialty ejectors include heating, mix. Jet liquid pump gas jet liquid pump steam jet liquid pump liquid jet liquid pump. Gas holdup and energy dissipation in liquid gas ejectors. Liquid gas ejector is a hydraulic machine, in which the energy exchange of active fluid liquid and passive fluid gas occurs through their direct. Croll reynolds custom designs and manufactures specialty ejectors which are versatile in handling a wide variety of liquids and slurries using liquids and steam as motive fluids. Ejector working principle mechanical engineering site.
Transvac to produce ejectors using the very latest ejector design and construction techniques. Pdf design of ejector parameters and geometry for ejector. Pdf numerical investigation of a liquidgas ejector used for. The high velocity primary stream is produced by expanding a high. Th early boiler injector utilized a motive gas steam which was. Ejectors for gas, liquid, steam, or multiphase fluids from 3 up to 30. Vapor jet vacuum pump an ejector pump in which the entrainment.
Very often, the motive fluid is steam and the device is called a steam jet ejector. The application of ejector technology to subsea fields of. Product catalogue jet pumps mixers heaters vacuum systems. A method for prediction of gasgas ejector performance. They are most suitable for low noncondensable and high condensable loads in applications like distillationread more. The use of the liquid ejector enables the operation of the evaporator in a flooded mode and recirculates the r744 liquid phase, which improves the energy efficiency of the refrigeration system. Liquidgas ejector is a hydraulic machine, in which the energy exchange of active fluid liquid and passive fluid gas occurs through their direct. Pdf gas holdup and energy dissipation in liquidgas. Using a liquid as motive medium, liquid jet gas compressors compress gases or vapours with large pressure differences.
Eductors with liquid motives use aconverging nozzle, as liquids are not generally compressible. Inlet the operating medium liquid, gas, or steam under pressure enters the inlet and travels through the nozzle into. The two basic series of penberthy jet pumps covered in this bulletin are used for pumping liquids only. Due to simple design and lack of moving parts in system, installation costs. Ejector design software ejector sizing calculation. Additionally, this model has been applied to twophase systems including the gas liquid ejector designed for a proton exchange membrane pem fuel cell system. Liquid jet gas compressor, jet pump, ejector, liquid gas pump. Sterling sihi gas ejectors are used wherever the vacuum attainable by a liquid ring vacuum pump is not sufficient and where danger of running in cavitation is imminent for the liquid ring vacuum pump.
As an exception to the general gasliquid ejectors, the optimum ld ratio in helh2. An ejector pump operates when viscous and intermediate flow conditions obtain. A liquid gas ejector comprising a nozzle and a mixing chamber is disclosed, wherein the distance between the outlet section of the nozzle and the inlet section of the mixing chamber of a liquid gas ejector is determined from the following formula. The present invention pertains to the field of jet technology and more essentially to a liquid gas ejector having a nozzle and a mixing chamber. Wetzel graham manufacturing company batavia, new york p aper will discuss in detail design considerations involved in selecting steam ejector liquid ring pump vacuum system for crude tower service. Gas jet vacuum pump an ejector pump in which the entrainment fluid is a noncondensable gas. Ejector systems gea engineering for a better world.
A liquidgas ejector comprising a nozzle and a mixing chamber is disclosed, wherein the distance between the outlet section of the nozzle and the inlet section of the mixing chamber of a liquidgas ejector is determined from the following formula. The basic criterion is diffuser velocity less than critical, that is mach numbers less than 1. The present invention pertains to the field of jet technology and more essentially to a liquidgas ejector having a nozzle and a mixing chamber. The liquid jet eductor enables to lift, entrain and pump out a low pressure liquid utilizing a high pressure motive liquid. Ejector operation is conditioned by the complex interaction of a number of mechanisms. Depending on their operating characteristics motive fluid type, suction fluid type, etc. Pdf configuration dependence and optimization of the. Because of this, design differences may exist within the motive connection of the jet pump. There is a special ejector design for mixing air or other gases with the motive liquid or for aerating waste water. On the other hand, jet pumps with gas or steam motives use converging. Liquid ejector onshore middle east recover flare gas at oil and gas gathering facility. The ability of a process gas ejector to suck the vapours in, is what sets it apart from mechanical compression based recovery systems. Therefore, studies were undertaken to investigate hydrodynamic and mass transfer characteristics of gasliquid ejectors with gas. The actuating fluid, which may be a gas, vapor or liquid, is expanded.
Online ejector screening software log in request a login. A numerical analysis of novel liquidgas jet ejector. The suction is carried out by the ejector, which is powered by exhaust gases of combustion engine. For instance, jet pumps with liquid motives use a converging nozzle, since liquids usually cannot be compressed.
The model sg is generally used with higher pressure motive flows in the ranges of 60 to 120 psig. Duplex universal design flare gas ejector flare gas ejector, complete with motive gas flare gas ejector for bp, norway. Process gas ejectors process gas ejector manufacturers and. Eductors with gas motives utilize convergingdi\erg ing nozzles to achiee maximum benefit from the compressibility ofthe gas. When using the lm, a couple of elbows or a swing check valve are necessary to ensure that the ejector will.
The area of the minimal crosssection of the mixing chamber of the liquidgas ejector is determined from the following formula. The major difference between the ejector and the vacuum pump or compressor is it had no moving parts. Process gas ejectors process gas ejector manufacturers. A new approach for determining the main parameters of an ejector is proposed, and a sequence for calculating it is given. The reported work on gasliquid jet ejectors with gas as the motive fluid and liquid as the entrained fluid is scanty. They are used to replace or eliminate pumps when simple, ultrareliable liquid mixing is required. Our ejectors are used in a wide variety of industries in more than 80 countries. Liquid jet vacuum pump an ejector pump in which the entrainment fluid is a liquid usually water. Ezejector is a computer model for gas ejector and steam ejector design that has been developed based on a unique approach using fundamental principles. High pressure liquid ejectors compressing gas gas motivated ejectors.
In those situations, it is possible to use some other gas or other vapor to motivate an ejector. Commonly, the liquidgas ejector uses ballast water as the primary fluid and. Jrgjt eductor models for liquids pumping gases are. For small pressure differences, gas gas ejectors can be treated like liquid jet pumps. In this case, we will deal with gas suction stream applications. Aug 21, 2001 a liquid gas ejector having the introduced design and geometrical parameters pertaining to its mixing chambers exhibits an increase in efficiency. Numerical investigation of a liquidgas ejector in marine ships. Other models of eductors are available for specific applications. Fox venturi products integrates sixty years of venturi design experience with outstanding manufacturing capability.
Introduction ejectors are important equipment to produce vacuum and although have a relatively low efficiency, many industries and power plants use them to produce vacuum. Jet pumps have numerous applications in hydraulic dredging, nuclear reactor. During a startup process a multi ple of the gas flow can be achie. Ejector 1250 psig sub sea manifold recycle gas gemini liquid chevron, usa gom 200 psig compressor separator lowered arrival pressure at the platform by 200 psi, enabling loaded wells to produce consistently. Design features and operation of jet ejectors korting hannover ag.
These models can be used for both exhausting and evacuation. Fox liquid eductors are venturi jet pumps that use liquid to create vacuum to mix, blend, or dilute other liquids, dry solids, or gasses into a liquid stream. Gas ejector modeling for design and analysis a dissertation by chaqing liao submitted to the office of graduate studies of. The area of the minimal crosssection of the mixing chamber of the liquid gas ejector is determined from the following formula. This we must find new dimensions of ejector which meets this conditions. An ejector is similar to an of vacuum pump or compressor. Study of the configuration and performance of airair ejectors. Gas ejector design can however ejector performance analysis be determined by rigorous calculation using the. Ejector technology for efficient and cost effective flare.
Thus the results in the tables above for different gas flow rates, pressures or temperatures do not represent the performance of a specific ejector. Basic design, operating information, and operation limitations of air ejectors. For the design and scaleup of gas liquid ejectors, reliable data are required which describe the mass transfer characteristics as a function of the physical fluid properties, geometrical design. Basic ejector components are the steam chest, nozzle, suction, throat, diffuser and they discharge fig. Efficient gas dispersion in a cocurrent downflow bubble column with ejector type gas distributor leads to an enhanced mass transfer. Ejector technology for efficient and cost effective flare gas recovery gpagcc 24th annual technical conference, kuwait city, kuwait, may 1011, 2016. Home explore a method for prediction of gasgas ejector performance. Review on ejector efficiencies in various ejector systems fang liu shanghai university of electric power. Equirepsa, with its own technology, has designed and manufactured several variations of ejectors for over 25 years. The reported work on gas liquid jet ejectors with gas as the motive fluid and liquid as the entrained fluid is scanty. In some cases, these specialty eductors can pump a suction volume up to 50 times the motive volume. The jrgjt models sg and hg are general purpose eductors used to pump gas with a gas as the motive stream. Korting liquid jet vacuum ejectors christian berner. Efficiencies of each step within the ejector based on.
The ideal gas assumption, which is quite common in. Recovered gas routed to the existing plant bulk separator and then to the gas lift compressors small sidestream from an existing water injection pump used to provide the motive water to the ejector. This is why the liquid jet vacuum ejector is especially suitable for the startup evacuation of vacuum vessels. Index terms ejector, modeling, mixing chamber, vacuum pump liquid. Feasibility study of replacing steam ejector with liquid. Application korting liquid jet vacuum ejectors are utilised e. Jet pump technical data pumping liquids this technical bulletin includes general information about penberthy jet pumps plus specific details for selecting the proper unit. Jet pumps have numerous applications in hydraulic dredging, nuclear reactor cooling, oil well production and emergency drainages in marine ships. As a fully integrated modern inhouse ejector manufacturer, transvac maintains full control over process and mechanical design, supply of raw materials, manufacturing, scheduling and testing. During a startup process a multiple of the gas flow can be achieved in the upper pressure range compared to the suction flow at final vacuum.
Air, vapor and gas operated ejectors in some cases, steam is either not available, or it forms unacceptable byproducts when in contact with process gases. Ejectors are operated with either gases or liquids as motive fluid entraining gases or liquids 1. Eductors operate according to the bernoulli theorem kinetic energy of one liquid can be used to produce flow of. They can be used to pull both liquid and gas suction loads. The lack of a systematic and rational design method instigated the present investigation, of which the preliminary results were. System employs process gas ejectors for compressing the large volumes of vented vapours at near atmospheric pressures upto the discharge pressure.
An ejector is a device used to suck the gas or vapour from the desired vessel. The purpose of an ejector is to transport a gas, liquid, powder or solid particles from one pressure level to a higher pressure level. Probability density function or pdf is used to define the probability that a certain. Liquid jet vacuum pumps with flanged connections 39 fvp2 liquid jet vacuum pumps of ptfe 41 fvp3 liquid jet gas compressors 43 fgv1 oquestionnaire for liquid jet gas compressors, fgv1 46 liquid jet liquid pumps, general information 47 wp oquestionnaire for liquid jet liquid pumps, wp1, wp2, wp3 49 liquid jet liquid pumps of steel or stainless. A liquid jet solids ejector using water as motive fluid to convey gravel can be designated as water jet gravel ejector. A constant suction pressure can be maintained on such an ejector at varying capacities by controlling motive flow. Therefore, studies were undertaken to investigate hydrodynamic and mass transfer characteristics of gas liquid ejectors with gas as the motive fluid. Pdf from last few decades, the use of efficient ejector in refrigeration. For twophase gas liquid ejectors, the situation is even worse, knowledge is minimal. Boundaries of the application field of this procedure are revealed.
Air, vapor and gas operated ejectors croll reynolds. Mathematical model of ejector and experimental verification. Fox valve manufactures a broad range of engineered products based on one core technology. Even if the suction side of the ejector is closed, the liquid ring vacuum pump is protected against cavitation. Liquid jet gas compressor, jet pump, ejector, liquid gas. Review on ejector efficiencies in various ejector systems. A method for prediction of gasgas ejector performance pages. This paper presents a numerical investigation of an r744 liquid ejector applied to a supermarket refrigeration system. A created mathematical model describes the flow in the ejector, and was. Table 1 compares the space, power, and capital cost requirements for the overall fgr package with each technology. Gas ejector design can however ejector performance analysis be determined by rigorous calculation using the figure 1 shows a sketch of gas gas ejector based applicable equations 1, 2. Ejector with liquid ring vacuum pump lrvp in 210 mw plant of vijayawada thermal power station v. Liquid jet mixers for food applicationsorbitally welded design 63 fm2 liquid jet ventilators 65 fv1 oquestionnaire for liquid jet ventilators, fv1 67.
1194 948 1348 937 1096 1068 789 28 725 524 1 1515 869 452 873 267 826 1486 1097 1359 232 488 487 783 1297 902 1067 759 844 1342 1274 672 719 922