How to size liquid motive eductors for pumping liquids. Ejector for hydrogen fuel cell anode recycle the ejector works. When the speed of a fluid increases its pressure decreases and vice versa. A liquid motive medium is used to suck off another liquid and to convey it to a higher pressure. Product catalog gea engineering for a better world.
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. They are very useful for applications when expensive process fluid is to be recovered. A new fivestage jet ejector system to meet these requirements would use 95 lbhr of 100 psig steam. International refrigeration and air conditioning conference. Ejector modeling and examining of possibility of replacing. The basic criterion is diffuser velocity less than critical, that is mach numbers less than 1. Each tank jet mixer is designed to suit the process. A numerical analysis of novel liquidgas jet ejector. Very often, the motive fluid is steam and the device is called a steam jet ejector. Jet pumps, also referred to as ejectors, are devices for the conveyance, compression or mixing of gases, vapors, liquids or solids in.
Ejectors of this type are used throughout industry for pumping and mixing operations. The term jet ejector describes a device in which a pumping effect is achieved using a motive fluid. 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. At the eductor nozzle, the pressure energy of the motive liquid is converted into a high velocity jet. 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. Note that the term jet pump is used to refer to a liquidliquid ejector.
International journal of engineering trends and technology. Fox liquid jet exhauster data sheet fox venturi products. The equations of the constantpressure and constantarea models were verified. The ejector sucks off gases and or vapours with the aid of the. The most comprehensive source of design information for ejectors can be found in a series of engineering sciences data unit esdu data items, nos. This basic principle applies to every jet ejector in different models and ranges of application. Liquid jet ejectors for process gas compression and. Water and gas jet eductors jet pumps are designed for liquid pumping, mixing operations and to handle some solids in the liquid process stream. It not only decreases the energy level ratio, but also the increase in specific volume tends to choke the diffuser. The high pressure motive liquid enters the motive chamber of the eductor through a converging motive nozzle. Liquid jet vacuum ejectors can extract gases and vapours and compress them. Process vacuum and gas compression liquid jet ejectors.
Liquid jet vacuum pumps suction and compression of gas. High turbulence achieves a homogeneous intermixture of both flows. Ejector working principle mechanical engineering site. It is easy to operate, durable and generally troublefree because there are no moving parts. Step 4 size the ejector using the performance chart on page 6, under 0 suction lift hs. Our company culture was formed by our origins in the 1960s as designers and manufacturers of specialized, flightqualified venturi hardware for spacecraft applications. Furthermore, most jet ejectors use steam or compressed air as the motive fluid, which is easily found in chemical plants. Basic ejector components are the steam chest, nozzle, suction, throat, diffuser and they discharge fig.
It contains data needed by the manufacturer to design and quote an ejector for a specific application. Efficiencies of each step within the ejector based on. Ejector design software ejector sizing calculation. So for example, the suction pressure cannot be below 23 mbar 17,5 mm hg for a jet ejector with water as a. Steam jet ejectors bulletin 5eh singlestage ejectors fig. The function depends, above all, on the design of the motive. 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. Fox venturi products integrates sixty years of venturi design experience with outstanding manufacturing capability. 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. 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.
If the pressure reduction achieved by the ejector at the well head is a on the. Index terms ejector, modeling, mixing chamber, vacuum pump liquid. An ejector is a device used to suck the gas or vapour from the desired vessel. An ejector is similar to an of vacuum pump or compressor. 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. A constant suction pressure can be maintained on such an ejector at varying capacities by controlling motive flow. 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. Manufacturer of power and process equipment since 1876.
Liquid jet eductors the pumps with no moving parts. A second fluid gets entrained into the ejector through this low pressure region. This is perhaps one of the most recognized uses for a jet pump in the process industry. A jet ejector requires no mechanical drive and has no moving parts. Allows the use of all types of liquids or solutiosn, provided that there is no impediment to mix them. 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. Liquid jet vacuum ejector mounted on base frame liquid jet vacuum ejectors suck off gases andor vapours from a process. The eductor is a liquidliquid ejector, which used pressurized water for pumping other liquid from a lower to another higher level.
The liquid jet eductor enables to lift, entrain and pump out a low pressure liquid utilizing a high pressure motive liquid. They are most suitable for low noncondensable and high condensable loads in applications like distillationread more. By definition, an ejector is a jet device which uses an operating fluid at a high. The purpose of this penberthy jet pump application guide is to identify.
Like all penberthy jet pumps, liquid motive jet pumps are simple in design with. T he ejector computer model includes the following. If you can then use the typical steam jet ejector, the second article tells. Information required in order to properly size the eductor. I have fabricated the eductor and it is a big success. The ejector sucks off gases and or vapours with the aid of the kinetic energy gained from the motive liquid. They are used to replace or eliminate pumps when simple, ultrareliable liquid mixing is required. A transvac ejector venturi, eductor, jet pump operation is based upon bernoullis principle which states. Liquid jet pumps 33 liquid jet vacuum pumps, general information 35 fvp. 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. Performance is controllable by adjusting the motive fluid flow provided by an external pump. The dispersion of the entrained fluid in the throat of the ejector with the motive fluid jet emerging from the.
The purpose of an ejector is to transport a gas, liquid, powder or solid particles from one pressure level to a higher pressure level. Design of vacuum systems for crude oil vacuum tower. 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 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. In most installations manual selectors are set up to allow manual control of any. Due to simple design and lack of moving parts in system, installation costs. Liquid jet liquid ejectors by koerting can be used in shipbuilding, water treatment and fertilizer factories. Ezejector is a computer model for gas ejector and steam ejector design that has been developed based on a unique approach using fundamental principles. 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. The heart of all hijet systems is the hijector a liquid jet ejector of proprietary design. Rans study of the liquid jet gas ejector request pdf. Liquid jet exhausters copy ejector manufacturers and. Ravindram and pyla 1986 proposed a theoretical model for the absorption of 5 1 6 and % 1 6 in dilute 0 1 based on. Liquid jet eductor primetech ejector manufacturers.
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. 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. If an ejector is designed to use superheated motivating steam the latter can be overcome. Experimental observation for multi nozzle liquid jet ejector for. Additionally, this model has been applied to twophase systems including the gasliquid ejector designed for a proton exchange membrane pem fuel cell system. Design features and operation of jet ejectors korting hannover ag. Water jet eductors are products made for liquid pumping. 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. 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. Pdf geometrical optimization of a steam jetejector using the. Transvac atmospheric air jet ejectors can be combined with liquid ring vacuum pumps to increase their ultimate vacuum levels. Geometrical optimization of a steam jetejector using the computational fluid dynamics tool. The terms of jet pumps ejectors are defined in din 24290. Liquid jet ejector liquid liquid liquid singlephase flow.
Design of vacuum systems for crude oil vacuum tower distillation d. Liquid jet eductors mounted inside a liquid storage vessel are used to mix the contents fig. Fox liquid jet eductors made in usa fox venturi products. Elbel, stefan and hrnjak, predrag, ejector refrigeration. Korting liquid jet vacuum ejectors christian berner. An overview of historical and present developments with an emphasis on airconditioning applications 2008. The major difference between the ejector and the vacuum pump or compressor is it had no moving parts. This paper presents a numerical study on prediction of the performance of liquid jet gas ejector. Ejector installation, operation, maintenance and manual. The present study focuses on multi nozzle liquid jet ejector which is one type of venturi scrubber.
208 1049 370 28 1411 552 398 830 1201 1465 14 1151 180 1194 1493 1269 929 866 261 1233 546 323 320 1033 453 107 800 46 324 466 1390 1044