An ejector is a device used to suck the gas or vapour from the desired vessel or system. Very often, the motive fluid is steam and the device is called a steam jet ejector. Graham corporation ejector efficient operation youtube. Fox venturi ejector products range from small machined to bar ejectors to skidmounted, multistage vacuum systems including lrvps. The ejector is motivated by water and designed to suck varies types of gasses. The suction point is where the jet enters the mixing region, indicated on the drawing at the 3 to 6 point. Liquid jet mixers for food applicationsorbitally welded design 63 fm2 liquid jet ventilators 65 fv1 oquestionnaire for liquid jet ventilators, fv1 67. The operation of liquid jet pumps is based on high velocity liquid jet emerging from the motive nozzle entraining air or gas in the suction housing and. Conclusions a semiempirical model is developed for design and performance evaluation of steam jet ejector.
An operating fluid media, which is referred to as the motive, placed under pressure enters the inlet and is forced through the nozzle where it is converted into a highvelocity stream. I have fabricated the eductor and it is a big success. How do i design an eductorjet or venturi system to. Water pressures as low as 1020 psig are usable, while pressures of 40 psig and higher will maintain a vacuum of 14 in. In order to design for maximum ejector efficiency one. The fluid jet range is a group of products, most of which operate on the ejector principle. The major difference between the ejector and the vacuum pump or compressor is it had no moving parts. Performance data on water jet eductors bulletin 2m supp table 2652.
When the speed of a fluid increases its pressure decreases and vice versa. Liquid jet vacuum ejectors can extract gases and vapours and compress them. Normal range for a water jet ejector is from atmosphere to 45 mm hg abs depending upon the water temperature. These are ideal for demanding wastewater and sludge applications where dry installation is preferred. Regimes of ejector operation one crucial consideration in the analysis and design of ejectors is the variety of flow regimes that are possible, depending on operating conditions and the ejector geometry. Method of operation venturi consist out of three parts. Ejector design calculation pdf download anpsortigas.
Relative suction flow of steam jet vacuum ejectors the result of calculation will be identical with the download fulltext pdf. Product catalog jet pumps mixers, heaters vacuum systems. It boots of a simple design that indeed does not require any particular maintenance. Since an ejector has no valves, rotors, pistons or other moving parts, it is a relatively lowcost component is easy to operate and requires relatively little maintenance. While jet eductors may differ in appearance, basic operation is the same. Critical design means that the fluid velocity in the diffuse throat is sonic. Manufacturer of water jet ejectors, scrubbing systems and. Most ejectors have a fixed capacity curve as shown in figure 1. In noncritical units the fluid velocity is subsonic. An ejector is similar to an of vacuum pump or compressor. Water motivated our venting ejector is specially designed for suction of large amounts of gasses eg from cargo tanks and engine rooms co2.
Liquid jet eductors use the kinetic energy of a motive liquid to entrain another liquid, completely mix the two, and then discharge the mixture against a counter pressure and are used in large numbers throughout industry for pumping and mixing operations. Fox venturi products integrates sixty years of venturi design experience with outstanding manufacturing capability. Ejector designs can be classified either as critical or noncritical. The other conditions will then fall within the performance curve of the larger ejector. A liquid motive medium is used to suck off another liquid and to convey it to a higher pressure. Our company culture was formed by our origins in the 1960s as designers and manufacturers of specialized, flightqualified venturi hardware for spacecraft applications. Offtheshelf fox airgas jet ejector fox venturi products. Ejector design calculation, ejector dimensions, generate.
Ejectors using water as the motive fluid are designed for reasonable noncondensable loads together with large condensable flows. Best a generalized ejector model was successfully developed for gas ejector design and performance analysis. The other conditions will then fall within the performance curve of. Using a water jet ejector, the motive power is taken all the way through the kinetic energy of the flowing water. If your project requires any of the following, we can provide outstanding engineering support. Eductors use a high speed jet to mix with the fluid that needs to be pumped. Ejector for hydrogen fuel cell anode recycle the ejector works. Kayode coker, in ludwigs applied process design for chemical and petrochemical plants fourth edition, volume 1, 2007. Product catalog gea engineering for a better world. In a steamjet ejector, the suction chamber is connected to the vessel or pipeline that is to be evacuated under vacuum. Air ejector theory learn how and air ejector works bright. In this type of ejector the capacity is a function of the absolute pressure at the suction inlet. Previous 1d analytical models can be derived from this new.
This is certainly one of the most rational, easy to install and rational concept to deal with considerable vapors. The ejector system should be designed to avoid creating a vacuum in the flare gas line to ensure safe operation. Ejectors are simple in design and reliable in operation since they dont have movable parts like stadanrd pumps. The motive fluid for these type of water jet ejectors is water instead of steam. Algorithm for simulation of ejector calculating design parameter a1, a2, a3. Ejector working principle mechanical engineering site. The heart of all hijet systems is the hijector a liquid jet ejector of proprietary design. Airvacuum ejectors bvtype ejectors water motivated this type of ejector is ideal for making vacuum. It is obtained that blade ejector creates optimal conditions for aeration of the fluid. The lowest possible suction pressure in the reactor is only limited by the vapour pressure of the motive liquid. Water jet eductors are products made for liquid pumping and. Clean coal program research activities it employs a ktron lossinweight twinscrew coal feeder with modified eductor design is installed to provide steady and consistent coal feeing, which is the key to study the coal jet flame stability.
Water vapor pressure table, pressure range 170 bar saturated steam 17 abl6. Bulletin 2m also contains information on available types, sizes and dimensions. So for example, the suction pressure cannot be below 23 mbar 17,5 mm hg for a jet ejector with water as a. May, 2015 a transvac ejector venturi, eductor, jet pump operation is based upon bernoullis principle which states.
Water jet eductors are products made for liquid pumping. Featuring proven, unique internal geometries and tightly tolerancecontrolled steam nozzle configurations, graham ejectors produce very low steam. Flygt jet mixers from xylem combine the patented flygt npump with an innovative ejector assembly for highefficiency, lowcost mixing. Occasionally an ejector must operate alternately at two or more conditions of load and vacuum. A transvac ejector venturi, eductor, jet pump operation is based upon bernoullis principle which states. Table 1 ejector versus suctiondrafting performance characteristics. Jet pumps, also known as eductors, operate on the principles of fluid dynamics. In this instance the ejector must be designed for the most difficult conditions or the conditions that call for the largest ejector. A steam ejector is of critical design when the suction pressure is lower than approximately 55% of the discharge pressure. Review of ejector design parameters and geometry for refrigeration and. Ejector vacuum pump a kinetic pump which use the pressure decrease due to a venturi effect and in which the gas is entrained in a highspeed stream towards the outlet. Ejector design software ejector sizing calculation ezejector. Onedimensional model of an optimal ejector and parametric study of ejector efficiency ronan k.
Hence it is relatively lowcost and easy to operate and maintenance free equipment. 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. Suction capacities of water jet eductors, types 264, 266 and 212 1 inch size only. The most comprehensive source of design information for ejectors can be found in a series of engineering sciences data unit esdu data items, nos. System designs in which the flare gas is compressed into the fuel gas system are common. Increasing the steam pressure above the design pressure will not increase the capacity of the ejector. They are simple in construction consisting of suction housing,diffuser and motive nozzle. 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. Design the elements of an eductor design are shown in figure 1. It is established that air solubility ratio of this ejector is reached a level 0. Water vapor pressure table, vacuum range saturated steam 15 abl5. Turbine works manufactures water ejectors for industrial and marine purposes. In a steam jet ejector, the suction chamber is connected to the vessel or pipeline that is to be evacuated under vacuum. They are very useful for applications when expensive process fluid is to be recovered.
This equipment has many different applications, discussed below. They are most suitable for low noncondensable and high condensable loads in applications like distillationread more. An ejector pump operates when viscous and intermediate flow conditions obtain. Water pressures as low as 1020 psig are usable, while pressures of 40 psig and higher will maintain a vacuum of 1. Introduction suction nozzle ejector has been widely used in different cycles for refrigeration purposes, such as recovery of expansion work, utilization of lowgrade energy solar energy, geothermal energy and waste heat. This means that they use no moving parts and generally utilise a pressurised motive fluid such as water, steam or compressed air to drive and or mix media. Systems are engineered to interface with our customers design and control schemes. Onedimensional model of an optimal ejector and parametric. Free demo programs for a short time are offered to let you see how the ejector program works they are not intended for your design work. In house process design software jet condensers typically use less cooling water autodesk inventor 3d cad system, htfs, finglow collaborative design process ensures optimum system performance iso 9001 qa certification compliant to international standards and design codes uk design and project and contract management.
If the pressure reduction achieved by the ejector at the well head is a on the. Air ejector theory learn how and air ejector works. Lienhard vd a massachusetts institute of technology, cambridge, ma, u. Basic ejector components are the steam chest, nozzle, suction, throat, diffuser and they discharge fig. Jet pumps, also referred to as ejectors, are devices for the conveyance, compression or mixing of gases, vapors, liquids. Ejector design calculation pdf download unger i hedmark l. Jul, 2016 graham has mastered steam ejector design. Steam jet ejector water jet ejector vacuum jet ejectors. Forest service model 62 engine to the ejector at a water source figure 2. How do i design an eductorjet or venturi system to rapidly. Korting liquid jet vacuum ejectors christian berner ab. High turbulence achieves a homogeneous intermixture of both flows. 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, subsequent braking of the flow and thus converting kinetic energy of. Introduction jet pumps are one of the most common devices used to transfer and mix gases and fluids, increase.
Ejector design software ejector sizing calculation. Liquid jet ejector system provides a low maintenance,low cost alternative to other vacuum systems. Note that the term jet pump is used to refer to a liquidliquid ejector. If there is a convergent nozzle not shown in the drawing the jet, the suction point, and the mixing region should be upstream of the convergent section. 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. Water jet ejector eductors uses water as motive force. Multi stage steam jet ejector systems staging of ejectors barometric condenserschem process. Liquid jet vacuum ejector mounted on base frame liquid jet vacuum ejectors suck off gases andor vapours from a process. Water jet ejector manufacturer, supplier nidhi engineers. 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. How it works these key components comprise flygt jet mixer the intake bellmouth, flygt npump, the nozzle. Water jet ejectoreductors uses water as motive force. Liquid jet vacuum pump an ejector pump in which the entrainment fluid is a liquid usually. Liquid jet ejectors water jet ejector latest price.
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