Modelling of steam turbine and its governing system. Of all operating environments, the state of idle readiness introduces the highest level of contamination exposure to a turbine bearing and lube oil system because the rotor and, in most cases, lubrication system are in a static state while live steam leaks past the carbon shaft seals. Such a package consists of a baseframe with oil system, steam tur. Steam turbine training governing system training course. The first steam turbine used for power generation was invented in 1884.
So the use of nozzle governing is limited to small turbines. The steam turbine reservoir should be inspected for sludge and varnish. Industrial steam turbines the new atp family the optimum. Control of lube oil pressure and temperature, as well as rotor axial displacement and eccentricity is necessary. Along with providing lubrication to the shaft bearings, the oil also lubricates the oil pump, and in some systems is used as a turbine control fluid in the hydraulic governing system. This module introduces the steam turbine oil systems used within a combined cycle plant, including the lubricating oil system, hydraulic oil system, and seal oil system. Steam turbine training and governing system training. Steam turbine governing is the procedure of controlling the flow rate of steam to a steam turbine so as to maintain its speed of rotation as constant.
In nozzle governing method, there will not be any importance to the steam inlet pressure and it is done by the boiler and bypass pressure control system. This gives the advantage on throttle governing where the power reduction will happen gradually. Approval issue course 234 turbine and auxiliaries module 10 stressed that these consequences. Jan 01, 2017 steam turbine control valve, governing and lube oil system. For both systems the oil is taken from the main oil tank. The speed governing system consists of a proportional regulator, a speed relay, and a servomotor controlling the gate opening. Steam turbine governing system is a method, used to maintain a constant steady speed of turbine. The variation in load during the operation of a steam turbine can have a significant impact on its performance. Comparing combined gas tubrinesteam turbine and marine low speed piston enginesteam turbine systems in naval applications abstract the article compares combined systems in naval applications. An electronic governor can provide precise speed control with fewer wearing parts than an equivalent mechanical governor. Too high oil pressure increases the risk ofoverpressure failure in the lube oil system. The governing systems for thermal and hydro generating plants are. Since this is the main source of energy transport it is a critical component in the plant. Reaction turbine blading and conditions figure 3 shows, at the top, the end view of four stages of fixed and moving blades of an.
It was originally a high quality, straight mineral oil with good water separating qualities. This is a short description about steam turbine generator lube oil system. The object of the analysis is the combined gas turbinesteam turbine system which is compared to the combined marine lowspeed diesel enginesteam. Steam turbine lubricating oil characteristics mostly turbine of steam power plant may have its rotational 3000 rpm to produce required power. Two steam generators produce steam from the heat energy generated by the reactor to supply the turbine for the main steam system. We also provide accessory skids for water wash, fire suppression, denox and water injection. This system generates electricity by using the main steam system to drive a turbine generator unit. The turbine generator speed is described by the equation of motion of the machine rotor, which relates the system inertia to deference of the mechanical and electrical torque on the rotor. Figure 8 incorporates a mechanical governor on a single valve unit in conjunction with a full oil relay system. The steam turbine training program provides detailed knowledge on steam turbine assembly and dismantling. In the few candu units wh turbine lubricating oil, instead of frf, is used in the. The following protective aetlons listed in the orderofdropping pres. The major concern caused by too high pressure oflubricating orjack ing oil is that it,increases the risk of system overpressure failure if the reliefvalves failed to operate.
It is always necessary to check whether lube oil pumps has started and whether all bearings are supplied with oil. Animated cutsections give a deep insight into steam turbine operation and how they. Steam turbines startups 171 prior to switching on the turning gear, oil system is started up. The intent of the this project is to more fully understand the governing dynamics of turbines, and using the knowledge, program a custom tcm for a small gas turbine. The operator must clean the turbine or if lacking the expertise hire a professional firm to do it. The importance of this method is, the turbine can maintain a constant steady speed irrespective of variation of its load. Both changes in oil temperature and oil contaminants affect the performance of the control system. Frequency control is achieved through generator control mechanism. Oil supply a single oil supply line lubricates and cools the bearing, governs the mc and operates the hydraulic actuators and safety and protective devices. Chaplin encyclopedia of life support systems eolss summary the steam system supplies steam from the boiler or reactor to the turbine. Chapter6 hydroturbine governing system iit roorkee. Governing of steam turbine is the procedure of controlling the flow rate of steam to a steam turbine so as to maintain the speed of the turbine fairly constant irrespective of load on the turbine.
Jul 12, 2015 turbine governing oil system write up slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Turbine speed governing system plz use speakers youtube. Steam turbine lube oil and control oil system viscosity. The governor is a control component with advanced protections for the turbine which ensure safe operation of the turbine. Part of this inconsistency is due to lack of knowledge. A publication of the lubrication engineers technical department.
Jun 16, 2014 turbine governing system an overview 1. There is inconsistency however in understanding what conditions justify a lube oil change. The schematic representation of hydraulic governor control is shown in. Comparing combined gas tubrinesteam turbine and marine low. Our geared reaction turbine grt is a highly efficient, robust and compact turbine designed for. The electronic governor may also improve plant production from driven equipment through enhanced steam management while providing realtime data on. Model the dynamics of speed governing system, steam turbine. However in later steam turbine control hydraulic governor is provided in parley with the electrohydraulic governing as a back up control which readily assumes the turbine control in the event of ehc failure. Turbine governing systeman overview free download as powerpoint presentation. Gas turbine seal oil system the components of the gas turbine seal oil system. Jul 29, 2015 most turbine oil users change their fluid based on its condition rather than intervalbased oil changes, such as what we do when changing the motor oil in our vehicles. Steam turbine governing and its mechanism ece tutorials. The typical main turbine in nuclear power plants, in which steam expands from pressures about 6 mpa to pressures about 0.
Steam turbine lube oil and control oil system free download as powerpoint presentation. Chaplin encyclopedia of life support systems eolss figure 4. Steam turbine oil challenges part two maintenance and. Steam turbine governing is the procedure of controlling the flow rate of steam to a steam turbine. Steam turbine control valve, governing and lube oil system. Some oil analysis laboratories have recognized the need for more comprehensive testing to determine lubricant condition for inservice turbine oils and offer specialized test slates and reports for inservice turbine oils.
The steam turbine and governor block implements a complete tandemcompound steam prime mover, including a speed governing system, a fourstage steam turbine, and a shaft with up to four masses. Steam turbines are one of the most versatile and oldest prime mover technologies still in general production used to drive a generator or mechanical machinery. Steam turbine oil challenges part one maintenance and. A publication of the lubrication engineers technical department leaders in lubricants number 41 other uses for turbine oils turbine oil was primarily designed for use in turbines. Standard dynamic turbinegovernor systems in neplan power system analysis tool. Governing system or governor is the main controller of the hydraulic turbine. General industrial steam turbine prefers a steam source of 42 kgcm2 600 psi at 482 oc 900 o f.
Figure 1 is a simple illustration of the general components and travel route of the oil in a steam turbine lubrication system. Pdf simulation of speed steam turbine control system. Wcecs 2010, october 2022, 2010, san francisco, usa oil. Today, then, the choice of governor systems is generally. Eliminating moisture damage to bearings on critical steam. Excellence in turbine control hycon digital turbine governor. Typically this includes the laboratorys interpretation of the test results and. Lubrication, seal and piping systems for turbomachinery. In larger steam turbines an oil operated servo mechanism is used in order to. Unloaders a typical turbine governing system has two unloaders one activated by low condenservacuum. Chapter 10, steam and power conversion, describes the steam and power conversion system for the ap design. If you continue browsing the site, you agree to the use of cookies on this website.
Controls the turbine speed during startup or in no load condition to permit the unit to be synchronized with the grid. Current efforts aim at a further reduction in the lead time to 8 months. Low jacking oil pressure can damageturbine generator bearings when turbine speed is toolow for adequate hydrodynamic lubrication. Approval issue module 2347 the turbine governing system. Governing system of the turbine does the following functions. Due to friction the temperature of bearing, rotor may increase which, combined with other factors, may leads to the failure of bearing hence produce a serious damage to turbine and plant. The module provides an overview of the purpose of each system and describes the major components of each.
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