Statkraft is currently involved in the operation of five gas power. Schematic diagram showing combine power plant with gas turbine. In all cases, the intention was to increase efficiency over that of single. Combining two or more thermal cycles within a single power plant. The power generated by the plant in combined cycle is about mw.
Show full abstract steam, power output of turbine, efficiency and heat rate of gas turbine, steam turbine and combined cycle plant. The exergy efficiency is calculated using the operating data. Combined cycle and combined heat and power processes. Figure 2 diagram of a combined cycle power plant in the turbine cycle, air is compressed to the operating pressure of the gas turbine and heated in a combustion chamber natural gas is burned in, followed by an expansion of the exit flue gas in a gas turbine, which in turn generates electrical energy in a turbogenerator. What is the difference between thermal power plant and steam. A good friend of environment than steam or nuclear. It steam power plant decreases the moisture content of the steam at the turbine exit as can be seen in ts diagram as shown in figure 2. First, a brief introduction of ffpp fundamentals and con. Natural gas conversions and cofiring upgrades can increase flexibility and lower the environmental impact of your fossilfired steam plant. Better friend of environment than steam power plant. The gasturbine cycle of a combined gassteam power plant has a pressure ratio of 12. Generally, combined cycle power plant is composed of gas turbines, heat recovery steam generators hrsgs, and steam turbines. Exergy and efficiency analysis of combined cycle power plant.
In the turbine, steam expands and in doing so does work, which enables the turbine to drive the electric. High performance equipment for steam and gas turbine. One may expect the overall efficiency of a steam thermal power plant to be. Overhauling a gas turbine including power outage is very costintensive. Hybrid solar and coalfired steam power plant with air. Pdf power plant lecture notes chapter2 steam power. To sum up, dadri power plant is based on gas turbine electric power production by steam turbine. This cycle combines in tandem, the gas turbine topping cycle with the steam turbine. Jan 10, 2017 for instance, if we raise the boiler efficiency from 85% to 90%, the resulting overall efficiency of the combined cycle power plant is raised to. Organic rankine cycle orcbased thermal power plants have an. The ccchp plant offers the highest available efficiency in both commercial and. Nov 17, 2011 a good friend of environment than steam or nuclear. Transient modeling of singlepressure combined cycle power.
The gas turbine exhaust gas flows through a hrsg in which thermal energy of the exhaust gas is used for steam production. Modelling of a watersteam cycle of the combined cycle. Table of content introduction context how it works why do they use this technology disadvantages to use natural gas the situation in france conclusion 3. Pdf study the performance of the combined gas turbine. The effects of gas emission steam power plant on the.
The topping cycle is a gas turbine cycle and the bottoming cycle is a nonideal reheat rankine cycle. In a simple steam power plant, at the top of the boiler highpressure superheated steam leaves the steam drum, also referred to as a steam generator and enters the turbine. Comparing combined gas tubrinesteam turbine and marine low. Steam power plant configuration, design, and control. Treatment systems from gea westfalia separator group therefore protect the core investment of the plant the gas turbine.
We also provide nextgeneration thermal power systems, such as integrated coal gasification combined cycle igcc power plants, steam power plants. The combustion gases leave the heat exchanger at 247c. This technology uses less fossil fuel and result in lower co2 emissions, thereby contributing to the prevention of environment pollution. The waste heat from the gas turbine is routed to the nearby steam turbine, which generates extra power. Large landbased electric powerplants built using this. The flow sheet of a thermal power plant consists of the following four main circuits. Ntpc national thermal power corporation was set up in the public sector in the 1975. Gas turbine based power plants documentos e informes. Ge combined cycle product line and performance ge power systems ger3574g 1 table 1. This new edition gives readers the latest technological developments and practical examples from existing, stateoftheart combinedcycle plants. Modelling of a power system in a combined cycle power plant sara bengtsson simulators for power plants can be used for many different purposes, like training for operators or for adjusting control systems, where the main objective is to perform a realistic behaviour for different operating conditions of the power plant. There the combustion, in air, of a fossil fuel such as oil, natural gas, or coal produces hot.
This article provides an overview of fossilfuel power plant ffpp con. The major components that make up a combined cycle are compressor, gas turbine, hrsg, and steam turbine as shown in fig. The results of analysis performed are discussed for 10mw power. Covers all basic aspects of power plant technology with separate topics by specialist aut hors. Gas power gas power is an environmentfriendly alternative to coalbased electricity production, and forms a bridge to a more sustainable energy supply in the future. Our steam turbines serve a vast range of industries ranging from food and sugar to biomass and textiles and beyond. Combined cycle gas and steam turbine power plants by rolf kehlhofer. For instance, if we raise the boiler efficiency from 85% to 90%, the resulting overall efficiency of the combined cycle power plant is raised to. A combined cycle power plant uses both a gas and a steam turbine together to produce up to 50 percent more electricity from the same fuel than a traditional simplecycle plant. Energy efficient solutions for thermal power solutions. The combustion gases leaving the gas turbine are used to heat the steam at 12.
For understanding the real problem in the plant, need an exergy analysis in every component. Dadri power plant ntpc, steam is used for power production. Boiler, turbine, condenser, pump, carnot cycle for steam, disadvantages of carnot cycle application. Combined cycle thermal power plant, become operational in. Chaplin encyclopedia of life support systems eolss bibliography black and veach 1996. Also shown on the cover is a compactsize, nonreheating turbine, for which rapid growth is anticipated in the overseas markets. Air enters the compressor at 310 k and the turbine at 1400 k. Concentration of gas emissions in the housing around the power plant power plant the results of measurements of gas emissions in the housing around the power plant tonasa ii at radius of 200 m and 2000 m are compared with the above dispersion model, and the difference between each other in table 6. The use of distillate liquid fuels, usually diesel, is also common where the cost of a. As far as modern power plant, the overall thermal ency is very less. You can derive heat by burning coal,natural gas,oil and the kind of power plants that use these as fuels are traditionally called as fossil fueled power plants. The topping cycle is a gasturbine cycle and the bottoming cycle is a nonideal reheat rankine cycle.
By 2020, 36 per cent of europes electricity production is expected to come from gasfired power plants. Combined cycle power plant as in name suggests, it combines existing gas and steam technologies into one unit, yielding significant improvements in thermal efficiency over conventional steam plant. The rest of the energy must leave the plant in the form of heat. Modelling of a power system in a combined cycle power plant. In most countries, this requires an energy mix that includes renewables, gas and coal power generation. In this way, some of the otherwise lost energy can be reclaimed and the specific fuel consumption of the plant can be decreased. The gasturbine portion of a combined gassteam power plant has a pressure ratio of 16. There are many large independent power producers ipp using combined cycle power plants operating on natural gas to provide power to the electric grid and steam to one or more industrial customers. In a ccgt plant the thermal efficiency is extended to approximately 5060 per cent, by piping the exhaust gas from the gas turbine into a heat. Superheating the steam to higher temperatures has very desirable effect.
A theoretical investigation of efficiency enhancement in. Coal and ash handling plant steam generating plant steam turbine alternator feed water cooling arrangement 5. The moisture percentage at the exit of the lowpressure turbine, the steam temperature at the inlet of the highpressure turbine, and the thermal efficiency of the combined cycle are to be. Reference power plant the steam power plant investigated by the model was based on a typical supercritical steam power plant resembling the 750 mw e kogan creek black coal plant located in chinchilla, australia with reheat and cycle 74 t. The efficiency of a conventional steamelectric power plant, defined as energy produced by the plant divided by the heating value of the fuel consumed by it, is typically 33 to 48%, limited as all heat engines are by the laws of thermodynamics see. In the latter case, it is called a combined cycle cc power plant. Inorder to overcome the disadvantages of steam power plant we propose a combined cycle power plant with gas turbine which is shown in fig. With this third edition, international expert rolf kehlhofer leads a team of eminent engineers for the long awaited update of the bible for combinedcycle plants. The temperature to which steam can be superheated is limited by metallurgical consideration. Ger3574g ge combinedcycle product line and performance.
Sep 14, 2016 a schematic diagram of a steam power plant is shown in figure 1. The use of distillate liquid fuels, usually diesel, is also common where the cost of a gas pipeline cannot be justified. Gts, in combination with waste heat recovery steam gen erators that supply steam to steam turbines thus forming a combined cycle cc plant, are already. The maximum fluid temperature at the turbine inlet is about 620c 1150f for modern steam power plants, but over 1425c 2600f for gasturbine power plants. Concentration of gas emissions in the housing around the power plant power plant the results of measurements of gas emissions in the housing around the power plant tonasa ii at radius of 200 m and 2000 m are compared with the above dispersion model. Pdf power plant lecture notes chapter4 steam turbine.
Combined cycle power plant david grenier master gi 2 2. Cogeneration and combined cycle principles workshop chapter 1 principles of cogeneration gryphon international engineering services inc. Ntpc national thermal power corporation was set up. Thermal power plants contents trends and future outlook for thermal power plants 70. America, and is a model of the power plant technology to be constructed overseas in the future. The efficiency of a conventional steam electric power plant, defined as energy produced by the plant divided by the heating value of the fuel consumed by it, is typically 33 to 48%, limited as all heat engines are by the laws of thermodynamics see. Stag combined cycle thermal energy and power system features high thermal efficiency low installed cost fuel flexibility wide range of gas and liquid fuels. Various travel mechanisms are used, depending on the applications. In this research, a theoretical and analytical study of gas turbine steam turbine combined cycle for power generation was carried out to improve the performance of the thermal power plant. The book gives a comprehensive overview of the combined cycle power plant from a thermodynamic, technical, and economical point of view.
Jan 26, 2017 thermal power plantsthey convert heat into energy. A compressor is a device, which pressurizes a working fluid. Optimization simulation, using steel plant offgas for power. Steam power plant ppt steam power plant presentations. Feed water and steam flow circuit ii coal and ash circuit iii air and gas circuit iv cooling water circuit. A steam power plant using steam as working substance works basically on rankine cycle. A method of operating a combined gassteam power plant with improved control of nox emissions comprising compressing air in an air compressor, introducing said compressed air and fuel into a combustor and burning the resulting mixture therein, employing the combustor exhaust gases to operate a gas turbine, employing the gas turbine exhaust gases to. Comparing combined gas tubrinesteam turbine and marine. The use of higher temperatures in gas turbines is made. The combustion gases leaving the gas turbine are used to heat the steam to 400c at 10 mpa in a heat exchanger. A schematic diagram of a steam power plant is shown in figure 1. The recommended power supply for the semiautomatic fcaw process is a constantvoltage direct current dc machine. Combined gas and steam cogas is the name given to marine compound powerplants comprising gas and steam turbines, the latter being driven by steam generated using the heat from the exhaust of the gas turbines. Ppt combined cycle power plant linkedin slideshare.
Sep 22, 20 layout of steam power plant the schematic arrangement of a modern steam power station can be divided into the following stages. High performance equipment for steam and gas turbine power plants. How to calculate overall thermal efficiency of combined cycle. The hrsg supplies highpressure hp and lowpressure lp steam turbine and the deaerator. Comparison between various power plants iiteeeestudents. Nox reduction in a combined gassteam power plant general. Air enters the compressor at 300 k at a rate of 14 kgs and is heated to 1500 k in the combustion chamber. Layout of steam power plant the schematic arrangement of a modern steam power station can be divided into the following stages. The chp power station can utilize steam turbines, gas turbines, internal combustion engines or both steam turbines and gas turbines.
482 1251 314 129 482 1528 1364 1004 158 1320 625 267 1679 1376 504 517 724 1625 840 287 215 866 400 1066 995 496 634 928 1404 196 92 1028 908 577 314 1019 215 1120 985 1049 597 202 233