Steam jet ejectors, mechanical vacuum pumps, hybrid systems. A steam injector is typically used to deliver cold water to a boiler against its own pressure, using its own live or exhaust steam, replacing any mechanical pump. Ejector working principle mechanical engineering site. An ejector is similar to an of vacuum pump or compressor. Using them reduces the energy consumption of the process and cuts the machinerys operational costs sustainably. The motive steam enters the ejector through the motive fluid nozzle and is expanded into the mixing diffuser converting pressure energy into velocity energy. Our ejectors have the ability to handle large volumes at very high vacuum levels and can be optimized to contribute to process enhancements and operational efficiency. The ejectors form an integral part of distillation columns, condensers and other heat exchange processes. When first developed, its operation was intriguing because it seemed paradoxical, almost like perpetual motion, but it was later explained using thermodynamics. In a spindleoperated ejector, the nozzle and tapered spindle work together similar to a needle valve. Some of these involve distillation,filtration, drying, degassing,deodourizing, deaeration, crystallization and many others. 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. Steam jet ejectors were for many years the workhorse of the chemical process industries for producing vacuum.
In this study, semiempirical models are developed for design and rating of steam jet. Very often, the motive fluid is steam and the device is called a steam jet ejector. Ejector systems ejectors gea engineering for a better world. Click below to download the product brochures in pdf format. Normal range for a water jet ejector is from atmosphere to 45 mm hg abs depending upon the water temperature. Performance optimization of steam jet ejector using cfd. Steam jet ejectors for the process industries mcgrawhill. Steam jet ejectors for the process industries 1994. The motive fluid for these type of water jet ejectors is water instead of steam. They are widely used to generate vacuums with capacity ranges from very small to enormous.
Ejectors are virtually maintenance free and can be constructed from a wide. The primary advantage of installing ejectors versus mechanical pumps is the ejectors simplicity of operation, low first cost and ability in handling wet. Thermocompressors use highpressure stream to entrain a lowpressure stream. With increasing emphasis on stricter pollution control, their use was curtailed. In this network five different approaches are described in order to model jet pumps and steam or gas ejectors in flownex. The application of steam vacuum ejectors is an optimal solution in industrial thermal. Steam jet ejectors are used in the chemical, petrochemical, pulp and paper, food, power, steel and allied industries in connection with such operations as filtration, distillation and evaporation, absorption, mixing, vacuum packaging, freeze drying, flash cooling, deaerating, dehydrating and degassing to name just a. Virtually maintenance free with no moving parts, they can be fabricated from almost any material, and can be used in every industry that requires vacuum. Jet ejectors are popular in the chemical process industries because of their simplicity and high reliability. Steam jet ejectors for the process industries robert b. Please provide us with some information about your vacuum application needs and we will provide you with a free quote to meet your specific requirements.
If you can then use the typical steam jet ejector, the second article tells points to consider when you figure what an ejector will cost. Steam jet ejectors are the simplest and most reliable form of vacuum. The steamjet ejector is a device designed to convert the pressure energy of a motivating fluid to velocity energy in order to entrain the suction fluid and then recompress the mixed. The basic principle of jet pumps consists in the liquid or gas jet being emitted by a nozzle at high speed entraining and accelerating the surrounding liquid, gas or solid matter. Steam jet ejectors bulletin 5eh singlestage ejectors fig. Steam jet compressors are part of many process engineering applications. The major difference between the ejector and the vacuum pump or compressor is it had no moving parts. Ejector products steam jet ejectors unique systems inc. This first case has momentum addition from the sidepipe into the main stream check the pipe sizes.
The fluids can be steam, air, propane or any other vapor phase material. Ejectors will handle highly corrosive vapours and fluids. Keeping the variegated requirements of our clients, we are offering these steam jet ejectors in various specifications and material of construction such as. Steam is used for creating vacuum in steam jet ejectors according to the needed pressure. Also known as thermocompressors or vapour compressors, steam jet compressors compress steam flows in various processes in a simple way. Due to their simplicity, constantpressure jet ejectors that. Graham corporation ejector efficient operation youtube. Steam jet ejectors for the process industries 2005. Shine a small light through the diffuse to make sure it is completely free from scale and is not pitted, grooved, or cut. Chemical engineering and processing 41 2002 551561 evaluation of steam jet ejectors hisham eldessouky, hisham ettouney, imad alatiqi, ghada alnuwaibit department of chemical engineering, college of engineering and petroleum, kuwait uni6ersity, p. Engineered by utilizing the finest quality components and raw material, these ensure trouble free operation and are resistant to corrosion and abrasion. A steam jet ejector is a simple device that uses pressurized steam to create a partial vacuum inside an enclosed system by pumping gases and vapors out of the system. The steam entrains the suction gases and the mixture. Get your kindle here, or download a free kindle reading app.
Our steam jet ejectors are able to process high vacuum levels, low pressure and low molecular gases. Steam jet ejectors, the largest vacuum producing device. As they have no moving parts, ejectors can provide many years of troublefree operation. Hence it is relatively lowcost and easy to operate and maintenance free equipment. Steam jet vacuum systems combine ejectors, condensers and interconnecting piping to provide relatively lowcost and lowmaintenance vacuum pumping. Steam ejectors are virtually maintenance free and can be constructed from a wide variety of steel, alloy and composite materials to include pp, ptfe and pvdf.
The two stream mix and discharge to an intermediate pressure. We also lead the industry in the duplication of parts and assemblies for. There are still many applications, however, such as those with. Especially the chemical industry makes largely use of steam jet ejectors to generate the vacuum required in many distillation processes. A practical guide to steam jet ejector technology for engineers and technicians, providing the latest methods for achieving maximum performance in any of the process industries. The unit is available in standard sizes up to 6 and custom fabricated for larger sizes. H k industries manufacturer of steam jet ejector systems. The suction flow is compressed to a higher pressure. In this case, the spindle is essentially changing the dimensions of the. Our ejectors are used in large variety of applications. Steam jet ejector manufacturer,steam jet ejector supplier. With this contact, the steam imparts velocity energy to the process and is decelerated. Steam jet ejectors, the largest vacuum producing devices available are used in the most demanding of applications.
These steam jet ejectors are typically used in air conditioning, refrigeration, petroleum and chemical industries. Nash has been designing, manufacturing and troubleshooting steam jet air ejector systems since 1986. Virtually maintenance free with no moving parts, they can be fabricated from. Steam ejectors provide vacuum in many process industries and utility companies.
Other types of injector may use other pressurised motive fluids such as air. Ejector design software to do conceptual design and generate ejector sizes. Selecting and optimizing steam jet ejectors and condensers for any vacuum level required for the process industries designing steam jet vacuum systems open file 220. The first step of the design and optimization process of the steam jet ejector. The attached article has a equation english units as given in the standards for steam jet vacuum systems published by heat exchange institute hei. Buy steam jet ejectors for the process industries mcgraw hill chemical engineering book online at best prices in india on.
Steam jet ejectors for the process industries 1st edition mcgrawhill, inc. They usually save as much as 10% to 20% in motive steam, compared with singlenozzle units designed for the same conditions. Evaluation of steam jet ejectors linkedin slideshare. Since pilot plant work is on a small scale, the types of steam jet ejectors that are used are not. Steam ejector training video used extensively throughout the process industries, steam ejector vacuum systems offer a. Buy steam jet ejectors for the process industries mcgraw. Evaluation of steam jet ejectors request pdf researchgate. Ejector systems are available in unlimited range of capacities and can. Table 2 gives an overview of some advantages and disadvantages of steam jet ejectors. The third article, suggesting how to get the most from ejectors, gives tips on troubleshooting and choosing materials of construction. Vacuum pumps market growth, trends, and forecast 2020. Steam jet ejectors the largest vacuum producing devices available are used in the most demanding of applications.
Steam jet ejectors for the process industries mcgrawhill chemical engineering robert b. These can also be fixed with mechanical boosters and vacuum pumps in order to create higher vacuum. Steam jet ejectors for the process industries by robert b. Can operate safely under the most hazardous conditions. Vacuum products steam jet ejectors by graham corporation. Steam jet ejectors for the process industries mcgrawhill chemical. Steam jet compressors, jet pump, thermocompressor, ejector. Steam jet ejector is a device for producing vacuum which is achieved by using a high pressure motive steam. 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 free demo programs for a short time are offered to let you see how the ejector program works they are not. A head of 34 feet of water less at higher altitudes can be used to remove the condensed steam from the system. Using a minimum of engineering jargon, it explains how to install different ejectors, how to operate them, and how to test and maintain them.
The primary advantages of steam jet ejector are simplicity of operation, no mechanical drive and has no moving parts. Used extensively throughout the process industries, steam ejector vacuum systems. Download pdf process vacuum system design and operation. An ejector is a device used to suck the gas or vapour from the desired vessel or system. A complete guide to getting the best from steam jet ejectors. Ejector design software ejector sizing calculation. Ejectors and steam jet ejectors document library graham. Manufacturer of ejectors single stage and multistage steam jet ejectors, five stage and six stage steam jet ejectors with condensor, two stage ejector with condenser and four stage ejector with condenser offered by newfield industrial equipment private limited, vadodara, gujarat.
Need to upgrade your current process vacuum system or help to design a new steam jet ejector system. Basic ejector components are the steam chest, nozzle, suction, throat, diffuser and they discharge fig. The steam ejector is a simple device consisting of three basic components, a motive steam nozzle, a suction chamber and a mixing diffuser. The ejectors, sometimes called eductors, along with any vacuum pump in the process, create the low pressure vacuum at the inlet of the first ejector. The new standard now integrates the previous three separate standards on steam jet ejectors. H k industries is a leading manufacturer of multistage steam ejector systems in the country. Ejectors single stage and multistage steam jet ejectors. What is the purposefunction of steam ejector in vacuum. Steam jet vacuum ejectors remove gases andor vapours from process operations thereby generating a vacuum in the reactor. Request pdf evaluation of steam jet ejectors steam jet ejectors are an.
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