It is a fluiddynamic pump with no moving parts, excepting a valve to control inlet flow. I have fabricated the eductor and it is a big success. Based on that experience and a heat and material balance, the manufacturer offered a singlestage ejector, that used 425 psig natural gas as motive gas. 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. In addition to the gas, a notable benefit to the igf design is the multistage approach, wherein the vessel is divided into separate chambers.
Jetpumpeductorejector enhance oil and gas production. If only one load and vacuum are required for a particular application, single and multistage ejectors can be designed specifically for one condition. Uses a venturi style injector eductor to generate a vacuum. A method is given for the design of a gas jet ejector for natural gas applications. Burner design air pressure drop is available at the design air flowrate. An operating fluid media, which is referred to as the motive, placed under pressure enters the inlet and is forced through the nozzle where it is converted into a highvelocity stream.
Calculation of eductor throat diameter and air flowrate. Thermal nox zeldovich occurs at high temps 1800k and is predominately no. Exit velocities can be eductors may differ in appearance, basic operation is the same. The liquid spray can be directed counter to the gas flow, in the same direction as the gas flow, or perpendicular to the gas flow. While jet eductors may differ in appearance, basic operation is the same. The motive fluid may be a liquid, steam or any other gas.
They were used as steamjet pumps or gas ejectors but with the currently. This application involves removing gases at a continuous rate from an area while maintaining the pressure at a stable level. Because of this, design differences may exist within the motive connection of the jet pump. Gas injection eductor tube the basic gaslifter system consists of a single, centrally located, floormounted eductor tube with individual gas lances. This drastically reduces shortcircuiting inside the vessel. How do i design an eductorjet or venturi system to.
Smaller fgrs sometimes utilize a single compressorejector. Our hydraulic induced gas flotation systems operate by recycling cleaned water downstream of the igf. These models can be used for both exhausting and evacuation. Duplex universal design flare gas ejector flare gas ejector, complete with motive gas flare gas ejector for bp, norway.
Lienhard vd a massachusetts institute of technology, cambridge, ma, u. The universal design ejector allowed for new internals to. Water jet eductors are products made for liquid pumping and. In this case, we will deal with gas suction stream applications. Chubb michaud cwsvi eductors, also called injectors, work on the venturi principle. Strictly speaking, all gas vapor motivated units are known as ejectors, while liquid motivated units are known as eductors.
If sizing is done regularly with other units, request a special sizing table from us. Gas burnertechnology gas burnerdesign forapplication. Fox venturi eductors are used to feed bulk solids, such as. Fox air and gas jet venturi ejectors fox venturi products. Consult with manufacturer to determine proper nozzle diameter. Design of eductor posted in industrial professionals. Gas eductors model sg, model hg northeast controls. The motive fluid can be produced water or sea water. Basic design, operating information, and operation limitations of air ejectors. Design of eductor industrial professionals cheresources.
Gas exit velocity chart if then 1 5 fps 5 10 fps 10 fps 25 fpm design 50 fpm maximum 25 fpm design 100 fpm maximum 50 fpm design 150 fpm maximum based on schedule 40 pipe. Uses a gas feed control unit to accurately meter chlorine gas to the injector. Ejectors also known as surface jet pumps, eductors or. Gas dispersion systems static mixers inline static mixers. Dimensions uv810 wall panel mount type uv810 uvb810 outline specifications features compact design. Eductors use a high speed jet to mix with the fluid that needs to be pumped. Onedimensional model of an optimal ejector and parametric. How do i design an eductorjet or venturi system to rapidly. Previous 1d analytical models can be derived from this new. Step 1 before beginning to do the actual sizing, convert all pressure and flow to the units used in the sizing table. Fundamentals of vapor recovery global methane initiative. Make sure that flow and pressure are available under flowing conditions. However, larger systems may use multiple compressorsejectors operating in parallel. Technical paper induced gas flotation igf within an api.
Best a generalized ejector model was successfully developed for gas ejector design and performance analysis. Alternative vacuum generation by a motorized induction unit. Lower than design motive gas pressure 1a raise motive gas pressure to the minimum specified by the ejector manufacturer 1b bore the motive nozzle to a larger diameter to permit design gas consumption. The entrained suction fluid may be a gas, a liquid, a slurry, or a dustladen gas stream. The eductor design application below will give the required inlet pressure and water flow needed with each size eductor at various discharge pressures. The adjacent diagram depicts a typical modern injector. An injector is a system of ducting and nozzles used to direct the flow of a highpressure fluid in such a way that a lower pressure fluid is entrained in the jet and carried through a duct to a region of higher pressure. The suction point is where the jet enters the mixing region, indicated on the drawing at the 3 to 6 point. For instance, jet pumps with liquid motives use a converging nozzle, since liquids usually cannot be compressed. They transport fluids with relatively small flow rates of up to approximately 10 m 3 h from narrow deep wells where the water level is up to 40 m below ground level especially in the usa the advantage of this arrangement is that there are no moving components. If there is a convergent nozzle not shown in the drawing the jet, the suction point, and the mixing region should be upstream of the convergent section.
Jet pumps, also known as eductors, operate on the principles of. Exit velocities can be design of multi stage steam ejectors. The structure of the pump is such that it has an injector chamber with a narrow shaped nozzle or tapered jet that is located inside the. Process design of vacuum equipment vacuum pumps and steam jet ejectors project standards and specifications page 3 of 36 rev. Design and application of the gas jet ejector on marginal gas. Eductor jet pumps are used if the water level on the suction side is too low for the suction lift operation of a normal pump. They can be used to pull both liquid and gas suction loads. These pumps make use of their structure to transfer energy from one fluid to another via the venturi effect. A multistage unit was designed and built that took the gas from the tank vapors at atmospheric pressure, gathered the vent gas from the other separators and delivered the stream to the sales line at 500 psig. Thermal efficiency is inherently low due to the nature of the process. Eductors are a kind of jettype pump that do not require any moving parts to be able to pump out a liquid or gas. The calculations are a bit complex, requiring one to determine the draw rate of the device that will match your needs based on an unknown feed pressure and an unknown back pressure. Universal design nozzle and diffuser sections designed to allow the ejector to.
Keenan and neumann 3,4 are the basis of ejector design and performance analysis. Improving conventional flotation methods to treat eor polymer. Our aquavactor units use high pressure water as a motive and handle air as the suction gas. E xperience during the execution of engineering design and consultancy services has shown that the commonly available process simulation software is not. Ejector design calculation, ejector dimensions, generate. Heat from dryers and other processes that would normally be exhausted can be used to heat water being fed to the scrubber almost to the wet bulb temperature of the inlet gas. The overall compression ratio required is approximately 55. Onedimensional model of an optimal ejector and parametric study of ejector efficiency ronan k. Designing steam jet vacuum systems for costeffective vacuum pumping, the proper placement of condensers and pipe supports are critical david b.
The steam should be dry and saturated, unless the system specifications call for. Sep 07, 2017 since natural gas contains no nitrogen this mechanism does not apply for methane. The source of the motive fluid can be a fire hose to which the eductor can be connected to. Review of ejector design parameters and geometry for refrigeration and. Eductor is a simple type of pump which works on the venturi effect to pump out air, gas or liquid from a specified area. The constantpressure and constantarea models developed by. Tll series liquijet eductors are relatively inexpensive liquid powered devices that will pump smaller volumes of gas vapor, and create significant 28 inhg vacuum. Model tests of multiple nozzle exhaust gas educator. Gas is added to each chamber, and only the cleaner portion of the. This paper focuses and presents literature studies on recent development in ejector cooling system also the. Operating a steamjet vacuum system at steam pressures lower than those specified in the system design will reduce system stability. Fox air and gas venturi ejectors have no moving parts. The gas flow enters at the bottom of the tower and flows upward. Ejectors of this type are used throughout industry for pumping and mixing operations.
The jacobytarbox eductor eductor models sg and hg are general purpose eductors used to pump gas with a gas as the motive stream. Sep 15, 2005 customer to capture the vented gas from all. Size steam or gas motive for exhausting gases tank eductor. Fox valve manufactures a broad range of engineered products based on one core technology. The model sg is generally used with higher pressure motive flows in the ranges of 60 to 120. Current advances in ejector modeling, experimentation and. Prompt no occurs at low temps in fuel rich flame regions and can be significant in natural gas flames. Eductor require only a motive fluid or driving fluid for its operation, which allows it to use at any part of the ship including hazardous areas. Cold flow model tests of multiple nozzle exhaust gas eductor systems with constant area. Other models of eductors are available for specific applications. Flare gas rates entering an fgr will vary over time. Installation options of the pressurised gas railcars and tank trucks swivel joint loading systems for liquid phase and gas phase manual or partly automatic unloading safety precaution arrier, optical signalling system power supply units, pump stations, sprinkler systems earthing, gas.
On the other hand, jet pumps with gas or steam motives use convergingdiverging. In some cases, these specialty eductors can pump a suction volume up to 50 times the motive volume. As a first estimate, a five stage ejector is assumed. No shafts, no motor starters, no seals, no maintenance. The 1d model is developed based on thermodynamic equations governing perfect gas flow correlations is used in the current study to improve. Pdf a method for prediction of gasgas ejector performance.
First, equal steam flow rate is assumed to each stage. Water jet eductors bulletin 2m introduction the water jet eductor is a type of ejector which utilizes the kinetic energy of a pressurized liquid to entrain another liquid, mix the two, and discharge the mixture against a counter pressure. The unique nozzle eductor tridair hydraulic igf tridair hydraulic induced gas. Applications the alfa laval vortex shearmixer is a highperformance venturi slurry eductor uniquely designed to operate in demanding slurry mixing jobs. Induced gas flotation technology eductor igf hydraulic. The sidestream gas liquid dispersing equipment can be compactly side mounted directly on the contactor mixer or alternatively floorskid mounted. Caltec is a world leader in the design and manufacture of jet pumps also known as eductors and ejectors in the oil and gas industry, with a. Principle of operation foam eductor is a device that uses the venturi principle to introduce a proportionate amount of liquid concentrate into a water stream. Jetpump eductor ejector applications improvegasproduction inlowpressurefields boostgasdeliverypressure lowerseparatorpressure debottleneckcompressor replacecompressorstage minimiseproductionbackout features nomovingparts,minimal maintenanceandcontrol usesavailableenergy sources,suchashigh pressurewells,and compressorsonrecycle benefits. For cooling and rugged and uncomplicated in design, impinjet scrubbers can realize efficiencies in excess of. Pdf optimization of steam ejector design and performance.
A source of dry steam at or slightly above design pressures must be available at the ejector nozzles at all times. These range from offtheshelf solidsconveying, liquid, and gas jet eductors to highly qualified flow controls for spacecraft, energy research, and advanced product development projects. The units are sized based on a desired flow rate of gas through the eductor. Eductor operating principles basic theory an eductor uses a nozzle to produce a high velocity fluid jet to entrain the liquid surrounding the eductor fluid can be either a gas or a liquid. The venturi is the constricted portion of the waterway near the eductor inlet. Occasionally, however, singlepoint design ejectors are not always stable at very light loads or at loads slightly in excess of design. The gas release point, regardless of the depth of the digester, is 12 feet, permitting the use of a 7 psi gas compressor.
The high velocity primary stream is produced by expanding a high pressure fluid through a nozzle, or nozzles, of. High pressure water in, low pressure water out vacuum created. It consists of a motive fluid inlet nozzle and a convergingdiverging outlet nozzle. Therefore as eductor jet pumps do not make use of any moving components, they can be an ideal choice to extract the debris. Foxs eductor designs have been exhaustively tested with different materials. By controlling the volume and rate of air gas induced, the development. Ejector for hydrogen fuel cell anode recycle the ejector works. The inlet fluid pressures and temperatures are fixed, p m, p e, t m, t e. How to size liquid motive eductors for exhausting gases.
Ejector technology for efficient and cost effective flare gas. Design flue gas pressure drop is available for the convection section at the design flue gas flowrate. A steam injector is a typical application of the principle used to deliver cold water. Gas eductor if gas at low pressure centrifugal pump operating at constant flow rate sample point, valves, instrumentation, interconnecting pipework and standby equipment as required.
Recycled water passes through eductors that draw fuel gas from the vessel head space and recirculate it for. Eductor principle, operation and maintenance on ships. Foam eductors are usually portable devices however they can also be used in fixed system applications. Because of this, design differences may exist within the motive connection of.
Gea designs, manufactures and delivers gas jet compressor systems for on and offshore applications consisting of jet pumps ejector or eductor and silencers. Jet pumps, also known as eductors, operate on the principles of fluid dynamics. Gea designs, manufactures and delivers gas jet compressor systems. Their rugged construction and simplicity of design. Improving conventional flotation methods to treat eor. Other forms of motive fluids can be a gas, a dustladen gas stream or slurry.
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