Pdf ejectors of power plants turbine units efficiency and. May 24, 2018 ejector is nothing but an convergent divergent nozzle which will have motive steam and non condensing gasses as fluid. Power plants limestone slurry for fgd in september 2007, two vans of southern company engineers and other power plant design teams traveled to indiana to visit nipscos power plant utilizing the vacucam ejector mixer process for slurring pulverized limestone for fgd. For these situations, they can be used at close spacing. Jul 23, 2019 a kalina cycle is coupled to an ejector refrigeration cycle to generate power and refrigeration outputs, simultaneously. Ejector refrigeration cycle is driven by the heat which is extracted from a hightemperaturepressure stream of kalina cycle working fluid since the energy content of this fluid stream is not directly utilized in power production in the kalina cycle. As the key equipment to ensure the stable operation of containment spray system in nuclear power plant, a rccm ejector with safe and credible performance is very important to make sure the containment integrality under lose of coolant accident loca or pipe broken. Giesl ejector, a suction draught system for steam locomotives. The steam ejector method does not involve a rotating parts and is therefore maintenancefree, but its efficiency is poor. In condesing system, steam ejector has function to extract air and other noncondensing gases from the sealed condenser, and in such way to maintain vacuum which corresponds to ratio of. An ejector is a static piece of equipment with no moving parts figure 2. General electric systems technology manual chapter 2.
An intercondenser, however, increases the initial cost of an ejector. Ejector systems tie together multiple wells with a single pumping station and are typically used where the groundwater must be lowered more than 5 m, often in soil with low permeability. Liquid ejector price includes motive liquid pump assumes 75% efficiency and separator vessel. A steam injection system is provided for adding superheated steam to the gas flow path. Statistical data on ejector failures and recovery times. Nevadas first flash cycle geothermal plant mitsubishi completed the beowawe l7mw double flash cycle geothermal power plant in nevada in december 1985 and the plant has been operating successfully since that time. Ejector systems range from the simple, single ejector stage to very complex systems with as many as six ejectors in combination with intercondensers. Some important features of the ejector in the proposed system are described below. Rather than outsourcing the whole gas extraction system to a single vendor, fes has designed the system and specified components in detail to minimize the steam and power consumption. Lemprex ejector, a steam locomotive exhaust system.
Graham corporation ejector troubleshooting graham corporation. A water spray 52, 68, 98 and mixer system sprays water into the steam injection system, whereby the water is immediately vaporized and the. This is also known as the running ejector which evacuate the air continuously at the system running condition. For good opeartion it is necessary for steam ejector to receive calculated quantity of fresh steam of defined pressure and temperature p 8 to 40 bar abs, t 400 c. Samson agro ejector system in slurry tanker english. Geothermal power plants use the steam in these wells to drive a turbine and thus generate electricity. A study and analyze of an ejector in steam power plant. A study and analyze of an ejector in steam power plant krishan pranav. In this study, ejector mathematical models have been presented based on basic thermodynamic relations. Results for power output and gas turbine thermal efficiency are obtained and compared with the results of the gas turbine without a cooling system.
India abstract now a days energy consumption is very important for our future. A steam injected engine 10, including a compressor 12, a combustor 18 and a turbine 22 in series combination, with a gas flow path passing therethrough. 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. Ejector or injector, a pumplike device without moving parts static mechanical equipment. In a multipleelement ejector system, where the ejectors may be operated simultaneously, the piping area must be at least as large as the total crosssectional area, which is determined by adding the total areas of all ejector inlet connections. In a spindleoperated ejector, the nozzle and tapered spindle work together similar to a needle valve. A novel hightemperature ejector topping power cycle. The entire power plant including system engineering was designed by mitsubishi which also manufactured and supplied all equipment. Condensate and demineralized makeup water system is that of a power generation system. Ejector rack, an aircraft fitting for carrying bombs. These condensers are heat exchangers which convert steam from its gaseous to its liquid state at a pressure below atmospheric pressure. An ejector is similar to an of vacuum pump or compressor. Design of a waste heat recovery generator whrg for utilizing waste heat of coolant water is proposed to work in an ejector refrigeration system ers.
Localization prototype research of rccm ejector in nuclear. Provide logistics for supplier storage and regional distribution deliver and unload pulverized limestone to power plant silo. Proceedings world geothermal congress 2010 bali, indonesia, 2529 april 2010 1 gas extraction system in kawerau geothermal power plant hidekazu kotaka1, hiroshi shingai2 and tony gray3 1,2fuji electric systems co. Graham corporation ejector efficient operation youtube. The combined system is designed for the highest possible effectiveness of power generation and could find wide application in gastransmission systems of gas. The major difference between the ejector and the vacuum pump or compressor is it had no moving parts. This paper discusses about the use of ejector in steam power plant to save the heat. However, it was purchased from overseas supplier all along because of its special configuration, nonstandard design, severe. As per the two stage system, initially the lv ejector is operated to pull vacuum down from the starting pressure to an intermediate pressure. Croll reynolds steam ejector and hybrid ejector liquid ring vacuum systems find application in coal, gas and oil fired power plants as well as in nuclear and geothermal power installations. It works on the principle of convergent divergent nozzle as it provides the venturi effect at the point of diffusion as the tube gets narrows at the throat the velocity of the fluid increases and because of the venturi affect it pressure decreases, vacuum will occur in the diffuser throat where the suction line will be provided. The ejector sometimes called eductor system lifts the well water with a nozzle and venturi fed by water under high pressure, and so is not limited to.
Dec 22, 2016 steam jet ejector are used for air removal on surface condensers. Traditional pulverized limestone w vacucam ejector mixers vs. Us3277660a multiplephase ejector refrigeration system. A kalina cycle is coupled to an ejector refrigeration cycle to generate power and refrigeration outputs, simultaneously. Of course, the steam condensing must take place at a pressure above that corresponding to the saturation pressure of the cooling water. Steam ejectors power plant standard system untreated ejector partially treated ejector finished hush cover removable blanket installation closeup of d ring straps and velcro overlaps.
There are four major components to an ejector, the motive nozzle, motive chest, suction chamber and diffuser. The critical components are the turbine blades and bearings, and. The high velocity air water mixture enters to the shell and cooled in the first stage of the shell by condensate. Ejector working principle mechanical engineering site. If the air were not removed from the system it could cause corrosion problems in the boiler. Air ejector theory learn how and air ejector works. Working principle of steam ejector power plant tutorials. Korting offers many years of experience, expertise and continuous development of the korting products. Effect of operational parameters on a novel combined cycle.
When steam is passed through nozzle it creates vaccum inside condensor and sucks the nin condensable gasses in condenser and thr. Ejectors of power plants turbine units efficiency and reliability increasing. They usually save as much as 10% to 20% in motive steam, compared with singlenozzle units designed for the same conditions. Ejectors are available in either singlenozzle or multiplenozzle designs. Main steam condenser air removal is critical to efficient plant operation, and an application in which we excel, but we also cover the entire gamut of power plant applications, including waterbox and pump priming, condenser hogging, deaeration, flue gas desulfurization. The definitions of overall ejector efficiency and ejector component efficiencies in literature are. A surface condenser is a commonly used term for a watercooled shell and tube heat exchanger installed to condense exhaust steam from a steam turbine in thermal power stations. It must be determined, therefore, whether or not the additional. The system had been in operation for more than 10 years. Unit 2 steam power plant steam power plant structure 2. In the present study a mainairejector which is used in vijayawada thermal power station of 210mw power plant at. This ejector operates with parallel with the running ejector till the vacuum reaches 500600 mm of hg column, then the hogger ejector is switched off and main ejector will remain in service.
Hence it is relatively lowcost and easy to operate and maintenance free equipment. Power plants limestone slurry for fgd process xstreamlining. The efficiency of the ejector cycle is very sensitive to the ejector efficiency. It is known from chapter 9, power plant systems, that evacuating air from the condenser may be realized either with the help of a steam jet air ejector or by utilizing a vacuum pump. It is possible to utilize the coolant water from engine to activate in the ers. In operation a three stage system consist of a primary booster, a secondary high vacuum hv ejector, and a tertiary low vacuum lv ejector.
Graham corporation ejector troubleshooting youtube. The functional classification of the condensate and feedwater system, and condensate and demineralized makeup water system is that of a power generation system. The combined electro generating plant consists of a hightemperature steam power cycle and a lowtemperature hydrocarbon vapor power cycle, which together comprise a binary vapor system. How an air ejector works in a boiler feed system steam. The functioning of steam turbines condensation systems influence on the efficiency and reliability of a power plant a lot. Ejector systems gea engineering for a better world. Pdf ejectors of power plants turbine units efficiency. At the same time, the condensation system operating is provided by basic. Feasibility study of replacing steam ejector with liquid ring. In the present study a mainair ejector which is used in vijayawada thermal power station of 210mw power plant at unit1 in stage1 is considered. Feasibility study of replacing steam ejector with liquid. Gas extraction system in kawerau geothermal power plant. Recent rehabilitation technology for aging thermal power.
Steam ejector, a railway locomotive component used to create vacuum. An ejector is a device used to suck the gas or vapour from the desired vessel or system. In this paper a study of the effect of an ejector refrigeration system on the performance of a gas turbine power plant was done. Singlenozzle units are also available with an automatic spindle for special applications. Where cooling water is in short supply, an aircooled condenser is often used. A novel hightemperature ejectortopping power cycle a novel, patented topping power cycle is described that takes its energy from a very. A set of actual operational conditions was used to determine the. They are simple in operation and rugged in construction, can use a wide range of steam pressures, and will handle wet or dry mixtures of air, gases, or vapors at a nearperfect vacuum.
Air ejector theory learn how and air ejector works bright. In this case, the spindle is essentially changing the dimensions of the. Read more about different types and structure of steam jet ejectors, their advantages and disadvantages. For nealry 150 years now korting hannover ag has been in the business of supplying engineering performance, components and systems for process engineering plants.
Steam jet air ejectors are used as vacuum generating devices. For larger power generation turbines, a twostage gland steam system is common, as the unit must operate at medium vacuum levels 4 to 15 hga. Ejector technology for efficient and cost effective flare. Steam ejectors are frequently used in condensing steam turbine systems for creation of vacuum in vacuum condesers thus improving turbine and system performance. Us3277660a us5210a us521065a us3277660a us 3277660 a us3277660 a us 3277660a us 5210 a us5210 a us 5210a us 521065 a us521065 a us 521065a us 3277660 a us3277660 a us 3277660a authority us united states prior art keywords stream vapor liquid pressure velocity prior art date 196512 legal status the legal status is an assumption and is not a legal. Pdf design and nonisentropic performance simulation of. How an air ejector works in a boiler feed system steam turbines. The efficiency of steam turbines in a power plant directly correlates to the pressure of the steam that exits the turbine. Featuring proven, unique internal geometries and tightly tolerancecontrolled steam nozzle configurations, graham ejectors produce very low steam. Table 1 compares the space, power, and capital cost requirements for the overall fgr package with each technology.
Effect of operational parameters on a novel combined cycle of. Croll reynolds steam ejector and hybrid ejectorliquid ring vacuum systems find application in coal, gas and oil fired power plants as well as in nuclear and geothermal power installations. The steam in the earth however, is always accompanied by a small fraction of noncondensable gases that build up in the power plants condenser unless actively removed by some gas extraction system. Ejector technology for efficient and cost effective flare gas. A steam jet is used to pull air from low pressure source suction. Steam jet ejector are used for air removal on surface condensers. A novel hightemperature ejector topping power cycle a novel, patented topping power cycle is described that takes its energy from a very hightemperature heat source and in which the temperature of the heat sink is still high enough to operate another, conventional power cycle. After it passes through the turbine the steam is condensed in a condenser and recycled to where it was heated. In general, the diameter of the piping between the process and the ejector system must be at least as large as the suction connection in the firststage ejector. This ejector is known as the starting ejector which is used to pull the gasses at the time of starting of system. Ejector transformers, a character from the transformers franchise. Ejector is nothing but an convergent divergent nozzle which will have motive steam and non condensing gasses as fluid. A thermal power station is a power station in which heat energy is converted to electric power.