Fox valve manufactures a broad range of engineered products based on one core technology. Figure 2 characteristic pressure distribution within a liquid ejector 1. The terms of jet pumps ejectors are defined in din 24290. And also studied about replacing liquid ring vacuum pump with steam ejector for saving the consumption of steam and also the maximum ratio of return on investment and the minimum initial investment will be needed. Pdf the vacuum systems play crucial role in various industries including, but not limited to, power.
The ejector sucks off gases and or vapours with the aid of the kinetic energy gained from the motive liquid. Liquid gas ejectors these ejectors utilize liquid as the primary fluid. The major difference between the ejector and the vacuum pump or compressor is it had no moving parts. The liquid jet with surrounding air plunges at the top of the column, forming fines bubbles, which are moved downward by the higher momentum of the liquid jet prevailing. They are most suitable for low noncondensable and high condensable loads in applications like distillationread more. The most comprehensive source of design information for ejectors can be found in a series of engineering sciences data unit esdu data items, nos. He modified his original ejector design by integrating a spindle valve which could be axially. Pumps are designated and selected for optimizing performance.
If you can then use the typical steam jet ejector, the second article tells. An overview of historical and present developments with an emphasis on airconditioning applications. Ejectors for pumping gases are operated by liquids and gases. Information required in order to properly size the eductor. High turbulence achieves a homogeneous intermixture of both flows. In most installations manual selectors are set up to allow manual control of any. Process vacuum and gas compression liquid jet ejectors. At the eductor nozzle, the pressure energy of the motive liquid is converted into a high velocity jet.
Due to simple design and lack of moving parts in system, installation costs. Design of vacuum systems for crude oil vacuum tower distillation d. Ejector design calculation, ejector dimensions, generate. The action of liquid jet pumps is based on the fact that the liquid jet coming out of the motive nozzle at high speed entrains air, gas, liquid or solid matters from the head of the jet pumps and. Feasibility study of replacing steam ejector with liquid. Liquid jet eductors the pumps with no moving parts. By definition, an ejector is a jet device which uses an operating fluid at a high. The diffuser is designed to compress the mixture of motive and suction fluid. Principle of operation the liquid jet eductor enables to lift, entrain and pump out a low pressure liquid utilizing a high pressure motive liquid. Design requirements for the nozzle, mixing tube and diffuser are similar to those for jet pumps.
Due to the broad range of applications for steam jet vacuum equipment, the units are frequently specified in special alloys and plastics. Ejector design software to do conceptual design and generate ejector sizes. Liquid jet vacuum ejector 1 head 2 mixing zone 3 diffuser 4 nozzle system dn t motive connection dn s suction connection dn g mixed. Transvac to produce ejectors using the very latest ejector design and construction techniques. Design features and operation of jet ejectors korting hannover ag. The heart of all hijet systems is the hijector a liquid jet ejector of proprietary design. Because of this, design differences may exist within the motive connection of the jet pump. 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 purpose of an ejector is to transport a gas, liquid, powder or solid particles from one pressure level to a higher pressure level. Other ejector solutions jet mixers for tank mixing tank jet mixers provide a simple method of mixing. They are used to replace or eliminate pumps when simple, ultrareliable liquid mixing is required. Liquid jet mixers for food applicationsorbitally welded design.
Off design operating conditions, such as the shock occurring in the primary stream, are included in the generalized ejector model. The following design diagrams are based on the physical properties of water as a motive medium. Chem process has a full fledged test facility to simulate actual. Liquid jet vacuum pumps suction and compression of gas. 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 liquid ejectors by koerting can be used in shipbuilding, water treatment and fertilizer factories. Basic operating principle of the hijector is a momentum transfer from highvelocity and highdispersed liquid flow to gas or vapours, formation of supersonic two phase flow. The ejector design principles used in the ejector calculations for the program are explained including the ejector energy balance and effects of the ejector flow cones. Korting liquid jet vacuum ejectors christian berner. Design and performance for incompressible liquid flow.
They are especially effective in the chemical industry where an onsite supply of the highpressure motive gas is available. 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. Ejector working principle mechanical engineering site. A high velocity liquid jet is produced through the nozzle of the ejector system, which entrains air along with it. Online ejector screening software log in request a login. Pdf geometrical optimization of a steam jetejector using the. Water and gas jet eductors jet pumps are designed for liquid pumping, mixing operations and to handle some solids in the liquid process stream. Jet eductors and jet pumps for pumping, mixing and steam heating. Jet pumps, also referred to as ejectors, are devices for the conveyance, compression or mixing of gases, vapors, liquids. For instance, jet pumps with liquid motives use a converging nozzle, since liquids usually cannot be compressed. Fox liquid jet eductors made in usa fox venturi products. They are very useful for applications when expensive process fluid is to be recovered.
Numerical investigation of a liquidgas ejector in marine. Index terms ejector, modeling, mixing chamber, vacuum pump liquid. In the mixing zone the liquid and air flows are combined into a liquid jet containing fine bubbles, which shoots through the ejector. This is perhaps one of the most recognized uses for a jet pump in the process industry. The motive gas mach no is provided for information. Steam jet ejectors are typically furnished in cast iron or steel with a nozzle of stainless steel. Therefore ejector curves at fixed ejector geometry are calculated at the design discharge pressure and an increased discharge pressure see 3. A liquid motive medium is used to suck off another liquid and to convey it to a higher pressure.
The function depends, above all, on the design of the motive. Water jet eductors are products made for liquid pumping. Liquid jet exhausters e700 series the liquid jet exhauster is used to suck, entrain and pump out gases from its source point utilizing a high pressure motive liquid such as water or other liquid. Liquid jet ejector liquid liquid liquid singlephase flow without shock waves.
Calculating primary fluid nozzle inlet pressure p1. An alternative to vacuum pumps video steam jet ejectors offer a simple, reliable, lowcost way to produce vacuum. An ejector is similar to an of vacuum pump or compressor. This we must find new dimensions of ejector which meets this conditions. These range from offtheshelf solidsconveying, liquid, and gas jet eductors to highly qualified flow controls for spacecraft, energy research, and advanced product development projects. How to size liquid motive eductors for pumping liquids. In cases with a subsonic motive velocity, the efficiency of the jet ejector is greater than 90%. Ejectors of this type are used throughout industry for pumping and mixing operations. 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. Liquid jet vacuum ejector mounted on base frame liquid jet vacuum ejectors suck off gases andor vapours from a process. The lowest possible suction pressure in the reactor is only limited by the vapour pressure of the motive liquid.
A steam jet ejector is illustrated below as ex ample steam serves as motive fluid to create vacuum. Using liquid motives to pump liquid suction fluids. Liquid jet mixers for food applicationsorbitally welded design 63 fm2 liquid jet ventilators 65 fv1 oquestionnaire for liquid jet ventilators. Ejector installation, operation, maintenance and manual. Review of ejector design parameters and geometry for. The vacuum pump is designed and selected to operate at optimum interstage pressure. Design of vacuum systems for crude oil vacuum tower. 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. Note that the term jet pump is used to refer to a liquid liquid ejector. The high pressure motive liquid enters the motive chamber of the eductor through a converging motive nozzle. Primetech offers complete range of liquid jet eductors to meet various industrial needs and applications.
Liquid jet vacuum pumps are simple and versatile devices that generate vacuum using water or other liquid jet under pressure, by suction of gas or steam and discharging them at a pressure intermediate between motive and suction pressures. Review of ejector design parameters and geometry for refrigeration and air conditioning application. These are more indicative of the response of a specific ejector to changes in inputs. Mathematical model of ejector and experimental verification. Like all penberthy jet pumps, liquid motive jet pumps are simple in design with. On the other hand, jet pumps with gas or steam motives use convergingdiverging. 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. Liquids with other physical prop erties require a special ejector. Ejector design software ejector sizing calculation. Ejector modeling and examining of possibility of replacing.
Being selfpriming, they are ideal for discontinuous operations. Gas liquid jet pumps are widely used due to their diversity of assembly choices, artless design, and absence of moving parts1. Liquid jet ejectors steam jet liquid jet ejector combination systems steam jet vacuum pump combination systems pressure which may be selected between 814 mbar. Although design and construction may vary, this applies to all jet pumps. Review on ejector efficiencies in various ejector systems. The liquid jet eductor enables to lift, entrain and pump out a low pressure liquid utilizing a high pressure motive liquid.
Rogdakis and alexis 5 carried out a 1d analytical study to characterize the performance of an ejector system used for air conditioning, and in a complementary study 6 they investigated an ejector design using a twophase mixture nh 3h 2o based on the theory of keenan et al. An ejector is a device used to suck the gas or vapour from the desired vessel. When the speed of a fluid increases its pressure decreases and vice versa. Cutaway of an eductor jet pump penberthy jet pumps. Jet pump based on the type of primary and secondary fluid could be characterized as gasgas, gas liquid, and liquid liquid jet ejectors. A study and analysis of an ejector in steam power plant ijrar. Liquid jet vacuum pump an ejector pump in which the entrainment fluid is a liquid usually water. A transvac ejector venturi, eductor, jet pump operation is based upon bernoullis principle which states. Ejector is used as a device to compress or entrain the fluid.
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