How can i calculate the motive steam pressure of a steam. From single stage ejectors to fully packaged multistage ejector systems all transvac products are custom designed to meet the clients. Actually, i need the ejector to maintain the vacuum in the condenser of a steam turbine power plant and the turbine. A steam jet ejector is illustrated below as example steam serves as motive fluid to create vacuum.
The focus of this work is on an existing steam jetejector, whose primary flow. Ejector transformers, a character from the transformers franchise. Steam jet air ejectors are some of the most reliable vacuum creators, but they require proper tube maintenance and replacement of corroded or eroded tubes in order to function efficiently. Having no moving parts, no seals, no shafts, no packing, and no maintenance, our ejectors use steam, gas, or liquid as motive stream to transport, compress, or mix gas, steam, liquid, andor powder. The attached figures illustrate the two types of steam jet air ejector sjae systems used in the industry to remove noncondensables and water vapor from main condensers. In this paper, the steam jet ejector was designed and then the cfd analysis was carried out for the geometry. These power systems have found wide acceptance in modern plants because of the small space requirements, simplicity, reliability, low maintenance and quick starting characteristics. The motive steam pressure has a higher impact on motive steam consumption. How a modest inventory can provide important savings to the user. Even multistage units are readily adaptable to existing conditions. Efficiencies of each step within the ejector based on. How an air ejector works in a boiler feed system the air ejector draws out the air and vapours which are released from the condensing steam in the condenser. The steam jet ejector utilizes high pressure steam to compress low pressure vapours or gases. Use steam jet ejectors or thermocompressors to reduce venting.
It is one of the types of air ejector which is used in the steam like near the condenser to remove the non condensable gases and some vapour entering into main condenser by an air ejector and it is cooled by the main condensate and. In this case the motive steam pressure 4 10 bar has an impact on motive. Have you experienced a breakdown of performance in your ejector or ejector system. Steam jet air ejector sjae manufacturer exporter in. The steam entrains the suction gases and the mixture. Graham corporation ejector efficient operation youtube. Ejector products steam jet ejectors unique systems inc. Compressed air at 20 psig for pneumatic controls is a typical application for steam jet air compressors. Following results were obtained through the experiments. Mostly jet ejectors use steam or compressed air as the motive fluid, which is. If the steam pressure is too low for the intended application, a steam jet. We also lead the industry in the duplication of parts and assemblies for rotating equipment such as steam turbines, compressors and more. Nash has been designing, manufacturing and troubleshooting steam jet air ejector systems since 1986.
If the air were not removed from the system it could cause corrosion problems in the boiler. Pdf in this study cfd technique was employed to investigate the effect of divergent angle of primary nozzle. They are especiallyeffectivein the chemicalindustry where an onsite supply of the highpressure motivegas is available. Steam jet blowers utilize the ejectorventuri principle to move large volumes of air and other gases against low back pressures. Exhaustive survey has been conducted on the influence of geometrical parameters on the efficiency of the ejector as well as critical flow parameters to improve the overall performance. Due to this decreased pressure exhaust steam along with associated air. In a case study, the experimental data of a solar powered steam jet ejector air conditioner is. The major advantage of ejectors over vacuum pumps is the fact that they have no moving parts and are thus require little maintenance. Steam jet ejectors are a simple alternative to mechanical pumps for vacuum raising applications. As these gases are entrained in the steam, the mixture travels through the ejector into a venturishaped diffuser.
The steam nozzle discharges a highvelocity jet across the suction chamber. Water vapor pressure table, vacuum range saturated steam. The steam ejector is a simple device consisting of three basic components, a motive steam nozzle, a suction chamber and a mixing diffuser. Steam jet ejectors are based on the ejector venturi principle. Multistage steam jet vacuum systems korting hannover. In a vacuum jet ejector, the lowpressure vent steam is the motive energy source. It is one of the types of air ejector which is used in the steam like near the condenser to remove the non condensable gases and some vapour entering into main condenser by an air ejector and it is cooled by the main condensate and released in the ejector condenser. Other types of injector may use other pressurised motive fluids such as air. The motive steam enters the ejector through the motive fluid nozzle and is expanded into the mixing diffuser converting pressure energy into velocity energy. Transvac design and manufacture steam jet ejector systems in both standard and exotic materials. It is has a wide range of application in steam ejector in boiler condenser, fresh water generator and in priming the centrifugal pump. Ezejector is a computer model for gas ejector and steam ejector design that has been developed based on a unique approach using fundamental principles. Unique systems designs and manufactures process vacuum systems including condensers, steam jet ejectors, liquid ring vacuum pumps and hybrids along with instrumentation, complete automation and auxiliary equipment.
Steam jet ejectors, the largest vacuum producing devices available are used in the most demanding of applications. Reasons of wear recommended spare parts inventory troubleshooting support costs contact us view the croll reynolds photo gallery. If no operator action is taken over the next 60 minutes. Air ejector theory learn how and air ejector works. Venturi air jet, steam ejector, liquid eductor ejector. Replacing steam jet air ejector by vacuum pumpin garri 4 power. This is actually a combination of an air jet ejector and a vacuum pump. Depending on the application, an injector can also take the form of an eductorjet pump, a water eductor or an aspirator. Review on ejector efficiencies in various ejector systems. Fox venturi products integrates sixty years of venturi design experience with outstanding manufacturing capability. A general simulation of an air ejector diffuser system. Virtually maintenancefree with no moving parts, they can be fabricated from. How can i calculate the motive steam pressure of a steam jet air ejector. In order to evaluate the performance of the proposed ejector system for a steam jet refrigeration plant, performance tests were done by varying the suction load and suction pressure and keeping the motive and discharge pressure constant.
The steam jet blower normally utilizes highpressure steam as the motive force, but compressed air or gas at 15 venturi jet type media. All employees have the ability to respond to emails. This steam jet creates a vacuum which extracts air or gas from the adjoining vessel. The steam jet exhauster or vacuum pump is gas jet gas pump and is the basic stage for all high vacuum equipment. Nuclear power plant gaseous waste treatment system design siegfried l. As a result the roofs have some unique hatches often erroneously called ice hatches. High vacuum performance steam jet ejectors can handle air or other gases at suction pressures as low as three microns hg. Unit 6 steam condensers elements of a condensing plant, types of condensers, comparison of jet and surface condensers. A nuclear power plant is operating at 100 percent power when the only in service steam jet air ejector is inadvertently isolated from the main condenser. Nuclear power plant gaseous waste treatment system.
Steam jet air ejector performance evaluation for nuclear plants. Fox airgas ejector data sheet fox venturi products. Garri4 steam power plant works with regeneration rankine cycle, it consists of two steam turbines each one generates 55 mw. Steam ejector calculation posted in industrial professionals. If you need additional guidance about which of our products is right for your application, please use the ask a question form or call our office at 9733281011 and ask to speak with. Ejector design software ejector sizing calculation. Steamjet air ejector for motor ships general cargo ship. The operator verifies that condense r cooling water system parameters have not changed. Air jet vacuum pumps for connections to the suction side of liquid ring vacuum pumps.
Retubeco will inspect and repair every component of your steam jet air ejector, detecting erosion, steam impingement, and tube failures. Hi, i need a help for expert in this process engineering side. Here the exhaust steam and cooling water mix in hollow truncated cones. This basic principle applies to every jet ejector in different models and ranges of application. Graham corporation ejector troubleshooting youtube. Due to their simplicity and high reliability, they are widely used in chemical. Combining low capital cost, simple operation, high reliability and the ability to handle large volumes at very high vacuum levels, they can be optimized to. Typical steam jet air ejector stage variation of velocity and pressure in a stage some cousins in the ejector family steam jet ejectors. The application determines the design of the flow section. According to program steam flow and sizing seems perfect. Steam ejector calculation industrial professionals.
The air ejector is installed at the suction of the vacum pump, thus boosting its suction pressure and thus reducing the capitalinvestment cost for this pump. Steam jet ejector cooling powered by low grade waste or solar heat by adriaan jacobus meyer thesis presented in partial fulfilment of the requirements for the. How an air ejector works in a boiler feed system steam. Steam jet ejectors for the process industries robert b. Liquid jet ejector motive medium contributing to designation. At low loads we have been losing vacuum to the point of putting on the hogger and almost tripping the unit. We have a z and y stage steam jet air ejector on our 160 mw unit. Air exits the discharge vent opening at a low temperature to reduce the heat loss.
The high velocity primary stream is produced by expanding a high. The second stage ejector handles the air vapor mixture in the same manner as the first, and the steam air mixture from the second stage enters an aftercondenser where the action is similar to that in the intercondenser. An air ejector or steam ejector is a device which uses the motion of moving fluid motive fluid to transport another fluid suction fluid. A complete guide to getting the best from steam jet ejectors. An ejector operates on similar principles to create a vacuum feed connection for braking systems etc. I need to calculate how much vacuum pressure created if i used 15 barg steam pressure in steam ejector. A variety of air conditioning systems were used by american railroads, and santa fe settled on steam ejector air conditioning for the majority of its cars. Optimization of a highefficiency jet ejector by computational fluid dynamics software a thesis by somsak watanawanavet. Schutte and koertings is continuing normal hours of operations during the covid19 emergency order in pennsylvania with a reduced staff.
Steam jet ejectors are based on the ejectorventuri principle. Please complete the form below to request a quote on a fox air or gas jet ejector. Fox steam jet ejector data sheet fox venturi products. Basic design, operating information, and operation limitations of air ejectors. At the nozzle discharge, the now highvelocity steam flows through an air chamber where it comes into contact with and entrains the process vapors to be. Steam jet air compressors are useful for supplying compressed air in an explosion hazardous area where electrical equipment would have to be of explosion proof construction and relatively expensive.
The steamjet ejector is a pumping device with no moving parts. Transvac steam ejectors also atmospheric air ejectors are often run in combination with. The system has also been erroneously called steam injector. Ejector or injector, a pumplike device without moving parts static mechanical equipment. Steam jet air ejector sjae exporter in india jet flow technologies private limited is manufacturer of steam jet air ejector sjae in mumbai, steam jet air ejector sjae exporter, steam jet air ejector sjae export company from mumbai maharashtra india.
Data files and record keeping, periodic performance tests, spring is inspection season, temporary fixes, retest after. Ejector rack, an aircraft fitting for carrying bombs. Steam ejectors provide vacuum in many process industries and utility companies. A jet ejector requires no mechanical drive and has no moving parts. Easy installation relatively light in weight, jet ejectors are easy to install, and typically require no foundations. Our company culture was formed by our origins in the 1960s as designers and manufacturers of specialized, flightqualified venturi hardware for spacecraft applications. Performance optimization of steam jet ejector using cfd. Pdf cfd simulation of ejector in steam jet refrigeration. Furthermore, most jet ejectors use steam or compressed air as the motive fluid, which is easily found in chemical plants. Steamjet air ejector for motor ships steamjet air ejector a steamjet ejector may be used to withdraw air and dissolved gases from the condenser. Ejector design calculation pdf download unger i hedmark l.
A general simulation of an air ejector diffuser system derick thomas daniel university of tennessee knoxville, derick. Steam ejector systems for the process industries edwards vacuum. How to calculate the flowrate of motive fluid in an ejector free download as pdf file. Pdf geometrical optimization of a steam jetejector using the. T he ejector computer model includes the following. There is virtually no limit to where multistage steam jet vacuum systems in the processing industry can. The ejector sprays high speed steam, gas, or liquid through a nozzle and can produce vacuum stages. The steam jet blower is a steam jet or air jet air pump designed for large capacities at low drafts. George schwarz inherited my files when i left the ejector area to.
Steam jetejectors offer a simple,reliable,low cost way to produce vacuum. A new development in steam ejectors technology is the advent of hybrid air ejectors. In each stage of the steamjet ejector, high pressure steam is expanded in a convergentdivergent nozzle. Steam ejector, a railway locomotive component used to create vacuum.
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