How to size liquid motive eductors for pumping liquids. I have fabricated the eductor and it is a big success. The term jet ejector describes a device in which a pumping effect is achieved using a motive fluid. Due to the high compression ratio capability, the modern liquid jet ejector the hijector simplifies most vacuum and compression systems and reduces total cost of ownership. T he ejector computer model includes the following. Steam jet ejectors bulletin 5eh singlestage ejectors fig. If the pressure reduction achieved by the ejector at the well head is a on the. Ejector for hydrogen fuel cell anode recycle the ejector works. The major difference between the ejector and the vacuum pump or compressor is it had no moving parts.
Ejectors of this type are used throughout industry for pumping and mixing operations. This paper presents a numerical study on prediction of the performance of liquid jet gas ejector. They are very useful for applications when expensive process fluid is to be recovered. The dispersion of the entrained fluid in the throat of the ejector with the motive fluid jet emerging from the. An overview of historical and present developments with an emphasis on airconditioning applications 2008. In the case of liquid jet vacuum ejectors the achievable suction pressure at zero load corresponds more or less to the vapour pressure of the motive liquid.
Liquid jet vacuum pumps suction and compression of gas. 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. They are most suitable for low noncondensable and high condensable loads in applications like distillationread more. 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. In most installations manual selectors are set up to allow manual control of any. Liquid jet ejectors for process gas compression and. Their proprietary design ensures efficiencies consistent with todays demanding requirements. Efficiencies of each step within the ejector based on. Ejector installation, operation, maintenance and manual. Liquid jet eductors mounted inside a liquid storage vessel are used to mix the contents fig. It is easy to operate, durable and generally troublefree because there are no moving parts. International refrigeration and air conditioning conference.
Liquid jet eductors the pumps with no moving parts. The major factors which affect the efficiency of liquid jet ejector are liquid flow rate, gas flow rate, the concentration of absorbing liquid and the concentration of the solute in the gas. Eductors operate according to the bernoulli theorem kinetic energy of one liquid can be used to produce flow of. The addition of an atmospheric air jet ejector enables the liquid ring vacuum pump to operate outside its cavitation range allowing operation down to nearly 4 mbar abs. Water jet eductors are products made for liquid pumping.
Transvac atmospheric air jet ejectors can be combined with liquid ring vacuum pumps to increase their ultimate vacuum levels. Fox liquid jet eductors made in usa fox venturi products. Fox liquid jet exhauster data sheet fox venturi products. Ejector modeling and examining of possibility of replacing. The purpose of this penberthy jet pump application guide is to identify. The lowest possible suction pressure in the reactor is only limited by the vapour pressure of the motive liquid. Here is a specification sheet for steam jet and liquid jet ejectors. Rans study of the liquid jet gas ejector request pdf. At the eductor nozzle, the pressure energy of the motive liquid is converted into a high velocity jet. A liquid motive medium is used to suck off another liquid and to convey it to a higher pressure. Design features and operation of jet ejectors korting hannover ag. Information required in order to properly size the eductor. When the speed of a fluid increases its pressure decreases and vice versa. Design of vacuum systems for crude oil vacuum tower distillation d.
The terms of jet pumps ejectors are defined in din 24290. Elbel, stefan and hrnjak, predrag, ejector refrigeration. High turbulence achieves a homogeneous intermixture of both flows. 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.
Ravindram and pyla 1986 proposed a theoretical model for the absorption of 5 1 6 and % 1 6 in dilute 0 1 based on. Jet pumps, also referred to as ejectors, are devices for the conveyance, compression or mixing of gases, vapors, liquids or solids in. Index terms ejector, modeling, mixing chamber, vacuum pump liquid. The most comprehensive source of design information for ejectors can be found in a series of engineering sciences data unit esdu data items, nos. The ejector sucks off gases and or vapours with the aid of the.
Liquid jet liquid ejectors by koerting can be used in shipbuilding, water treatment and fertilizer factories. A jet ejector requires no mechanical drive and has no moving parts. Water and gas jet eductors jet pumps are designed for liquid pumping, mixing operations and to handle some solids in the liquid process stream. Due to simple design and lack of moving parts in system, installation costs. Liquid jet pumps 33 liquid jet vacuum pumps, general information 35 fvp. Each tank jet mixer is designed to suit the process. This basic principle applies to every jet ejector in different models and ranges of application.
An ejector is similar to an of vacuum pump or compressor. So for example, the suction pressure cannot be below 23 mbar 17,5 mm hg for a jet ejector with water as a. 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. Wetzel graham manufacturing company batavia, new york p aper will discuss in detail design considerations involved in selecting steam ejectorliquid ring pump vacuum system for crude tower service. Step 4 size the ejector using the performance chart on page 6, under 0 suction lift hs.
Korting liquid jet vacuum ejectors christian berner. Additionally, this model has been applied to twophase systems including the gasliquid ejector designed for a proton exchange membrane pem fuel cell system. Basic ejector components are the steam chest, nozzle, suction, throat, diffuser and they discharge fig. Note that the term jet pump is used to refer to a liquidliquid ejector. Design of vacuum systems for crude oil vacuum tower. Furthermore, most jet ejectors use steam or compressed air as the motive fluid, which is easily found in chemical plants. The function depends, above all, on the design of the motive.
Ejector design calculation, ejector dimensions, generate. A second fluid gets entrained into the ejector through this low pressure region. The term ejector or jet pump is a general name used to describe a piece of equipment with no moving parts which can be used to pump mix, heat, cool or produce vacuum. A constant suction pressure can be maintained on such an ejector at varying capacities by controlling motive flow. Allows the use of all types of liquids or solutiosn, provided that there is no impediment to mix them. 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 liquid jet eductor enables to lift, entrain and pump out a low pressure liquid utilizing a high pressure motive liquid. It contains data needed by the manufacturer to design and quote an ejector for a specific application. Manufacturer of power and process equipment since 1876. The basic criterion is diffuser velocity less than critical, that is mach numbers less than 1.
International journal of engineering trends and technology. Like all penberthy jet pumps, liquid motive jet pumps are simple in design with. The eductor is a liquidliquid ejector, which used pressurized water for pumping other liquid from a lower to another higher level. Our company culture was formed by our origins in the 1960s as designers and manufacturers of specialized, flightqualified venturi hardware for spacecraft applications. Liquid jet vacuum ejector mounted on base frame liquid jet vacuum ejectors suck off gases andor vapours from a process. Steamjet ejectors are typically furnished in cast iron or steel with a nozzle of stainless steel. Using energy from a suitable high pressure source a choked hp well for example an ejector can be used to lower the fthp of the lp well. If an ejector is designed to use superheated motivating steam the latter can be overcome. It not only decreases the energy level ratio, but also the increase in specific volume tends to choke the diffuser. A transvac ejector venturi, eductor, jet pump operation is based upon bernoullis principle which states.
If you can then use the typical steam jet ejector, the second article tells. This is perhaps one of the most recognized uses for a jet pump in the process industry. The purpose of an ejector is to transport a gas, liquid, powder or solid particles from one pressure level to a higher pressure level. A steam jet ejector is illustrated below as ex ample steam serves as motive fluid to create vacuum. 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. They are used to replace or eliminate pumps when simple, ultrareliable liquid mixing is required. Very often, the motive fluid is steam and the device is called a steam jet ejector. Fox venturi products integrates sixty years of venturi design experience with outstanding manufacturing capability. Process vacuum and gas compression liquid jet ejectors. 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. A new fivestage jet ejector system to meet these requirements would use 95 lbhr of 100 psig steam. Ezejector is a computer model for gas ejector and steam ejector design that has been developed based on a unique approach using fundamental principles. Pdf geometrical optimization of a steam jetejector using the. Experimental observation for multi nozzle liquid jet ejector for.
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 equations of the constantpressure and constantarea models were verified. A numerical analysis of novel liquidgas jet ejector. Ejector design software ejector sizing calculation. Product catalog gea engineering for a better world. 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. Ejector working principle mechanical engineering site. The high pressure motive liquid enters the motive chamber of the eductor through a converging motive nozzle. Other ejector solutions jet mixers for tank mixing tank jet mixers provide a simple method of mixing and agitating tanks with no intank moving parts and no maintenance. The heart of all hijet systems is the hijector a liquid jet ejector of proprietary design. By definition, an ejector is a jet device which uses an operating fluid at a high. 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 steel 50 wp1 standard liquid jet liquid pumps of pvcpp 51 wp2. Liquid jet ejector liquid liquid liquid singlephase flow. The other option was a hybrid vacuum source composed of a threestage steam ejector system and a liquid ring vacuum pump that is more energy efficient than ejectors for low vacuum applications.
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