Six important components of hydroelectric power plants. Pdf ejectors of power plants turbine units efficiency. Hydroelectric dam 1 dam the dam is the most important component of hydroelectric power plant. When a problem does occur, many plant personnel do not have the experience to effectively troubleshoot an ejector system, and precious production time is lost. Review on ejector efficiencies in various ejector systems. Steam powerplant free download as powerpoint presentation. The power plant control room operator training provides operators with the necessary knowledge and skills to operate a power plant distribution control system. There is no basic difference in functionality of starting or main ejectors. Japan can be expected to engage in new power plant construction as it moves to decommission its fleet of nuclear. A vacuum pump uses far less energy and vacuum distribution can be with lightweight piping. When steam is passed through nozzle it creates vaccum inside condensor and sucks the nin condensable gasses in condenser and thr. They are especially effective in the chemical industry where an onsite supply of the highpressure motive gas is available.
Tip investigate and cost the concept of using a central system for vacuum. India abstract now a days energy consumption is very important for our future. Chaplin encyclopedia of life support systems eolss 2. An ejector is a static piece of equipment with no moving parts figure 2. At the same time, the condensation system operating is provided by basic.
A study and analyze of an ejector in steam power plant. The diesel power plant is designed for base load operation for stationary application and is intended for electricity production in parallel operation with a public supply as well as island. Lessons include intro to the plant system, associated system controls and standard procedures used during start. Hence it is relatively lowcost and easy to operate and maintenance free equipment. Pumped storage hydroplant models for system transient. In this paper, the water flow is defined as positive when it flows. An ejector is a device used to suck the gas or vapour from the desired vessel or system. In main ejectors the used steam is condensed and connected to a flash tank or the condenser. A study and analyze of an ejector in steam power plant krishan pranav. Like sump pumps, ejector pumps have a basin installed under your basement floor.
An ejector operation in the critical range is designed for a fixed compression ratio and requires a definite motive steam flow. An ejector is similar to an of vacuum pump or compressor. Working principle of steam ejector power plant tutorials. How an air ejector works in a boiler feed system steam. What are the differences between starting ejector and main. America, and is a model of the power plant technology to be constructed overseas in the future. The only difference is the utilization of used steam in case of main ejectors. The same ejector can be made to operate with essentially. Coverage ranges from engineering economics to coal and limestone handling, from design processes to plant thermal. Ejector dewatering systems geoquip water solutions. 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 most active regions for new power plant construction are china and india. Ejector is nothing but an convergent divergent nozzle which will have motive steam and non condensing gasses as fluid. Improving turbine efficiencies for geothermal, coalfired and gasfired power plants.
Two actual case studies conducted by service engineers on cvdu ejector systems show how to troubleshoot ejector problems. 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. 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. The definitions of overall ejector efficiency and ejector component efficiencies in literature are. Cis allows a consumer to update hisher details, pay bills and view his or her recent activity. Turbine vacuum system in thermal power plant free download as powerpoint presentation. For example, a loss of vacuum in a multistage ejector system might have many plant personnel disassembling the firststage ejector booster, on the assumption that one must check a unit.
Steam jet ejectors for the process industries robert b. How can i calculate the motive steam pressure of a steam. Ejector transformers, a character from the transformers franchise. In a steam jet ejector, the motive fluid is a jet of high pressure and. Ejector or injector, a pumplike device without moving parts static mechanical equipment. There are four major components to an ejector, the motive nozzle, motive chest, suction chamber and diffuser. Also shown on the cover is a compactsize, nonreheating turbine, for which rapid growth is anticipated in the overseas markets. Steam ejector fundamentals steam jet ejectors offer a simple, reliable, lowcost way to produce vacuum. 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. This power plant engineering book has been written to meet the manifold requirement and achievement of the students and researchers. As a result motive fluid velocity at the nozzle tip is very less and it affects its noncondensable load handling capacity drastically. Turbine vacuum system in thermal power plant chemical. This ejector is known as the starting ejector which is used to pull the gasses at the time of starting of system.
Ejector wells work on the same principle as a well point system but allow water to be drawn from deeper in the ground. If the air were not removed from the system it could cause corrosion problems in the boiler. 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. Nash has been designing, manufacturing and troubleshooting steam jet air ejector systems since 1986. An ejector dewatering system consists of an array of wells pumped by jet pumps installed at the base of each well up to depths of 150 metres.
Multi stage steam jet ejector systems staging of ejectors barometric condenserschem process. Steam ejectors provide vacuum in many process industries and utility companies. The functioning of steam turbines condensation systems influence on the efficiency and reliability of a power plant a lot. The pumps discharge pipe is connected to a sanitary sewer line. Unit 2 steam power plant steam power plant structure 2. It is recommended that the length of the mixing chamber lmix. In china, despite the recent economic cooloff, it is estimated that approximately 1. We also lead the industry in the duplication of parts and assemblies for rotating equipment such as steam turbines, compressors and more. Ejector working principle mechanical engineering site. In a liquid jet ejector, the motive fluid is a noncompressible liquid generally water with no heat energy hence with a single stage centrifugal pump we can not increase its pressure much. Understanding ejector systems necessary to troubleshoot. Steam ejector, a railway locomotive component used to create vacuum.
Ejector systems can be very expensive to operate and there are good arguments for the use of a central vacuum system for the provision of vacuum to robot grippers see section 4. Actually, i need the ejector to maintain the vacuum in the condenser of a steam turbine power plant and the turbine exhaust pressure is 9. 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. 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. Traditional pulverized limestone w vacucam ejector mixers vs. A steam jet ejector system with surface condensers normally requires more motive steam and condensing. The efficiency of the ejector cycle is very sensitive to the ejector efficiency.
The major difference between the ejector and the vacuum pump or compressor is it had no moving parts. Ejector systems gea engineering for a better world. On ejector pumps where sewage is also handled, the lid to. Ejector rack, an aircraft fitting for carrying bombs. 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. For example, a high vacuum exhauster operating at 150 psig steam pressure compressing from 1 hg. The dam is built on a large river that has abundant quantity of water throughout the year.
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