To sum up, dadri power plant is based on gas turbine electric power production by steam turbine. Ge combined cycle product line and performance ge power systems ger3574g 1 table 1. The power generated by the plant in combined cycle is about mw. The combustion gases leaving the gas turbine are used to heat the steam to 400c at 10 mpa in a heat exchanger. A compressor is a device, which pressurizes a working fluid. The rest of the energy must leave the plant in the form of heat. We also provide nextgeneration thermal power systems, such as integrated coal gasification combined cycle igcc power plants, steam power plants. Comparing combined gas tubrinesteam turbine and marine low. This new edition gives readers the latest technological developments and practical examples from existing, stateoftheart combinedcycle plants. 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. 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. 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. Dadri power plant ntpc, steam is used for power production. A good friend of environment than steam or nuclear.
A schematic diagram of a steam power plant is shown in figure 1. Natural gas conversions and cofiring upgrades can increase flexibility and lower the environmental impact of your fossilfired steam plant. The combustion gases leaving the gas turbine are used to heat the steam at 12. 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. Show full abstract steam, power output of turbine, efficiency and heat rate of gas turbine, steam turbine and combined cycle plant. 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. This article provides an overview of fossilfuel power plant ffpp con.
Combined cycle gas and steam turbine power plants by rolf kehlhofer. 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. What is the difference between thermal power plant and steam. A steam power plant using steam as working substance works basically on rankine cycle. Statkraft is currently involved in the operation of five gas power. The temperature to which steam can be superheated is limited by metallurgical consideration. The use of distillate liquid fuels, usually diesel, is also common where the cost of a gas pipeline cannot be justified. 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. Layout of steam power plant the schematic arrangement of a modern steam power station can be divided into the following stages. Ntpc national thermal power corporation was set up in the public sector in the 1975. Combined cycle and combined heat and power processes. 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 exergy efficiency is calculated using the operating data. In the latter case, it is called a combined cycle cc power plant. 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 use of distillate liquid fuels, usually diesel, is also common where the cost of a. In the turbine, steam expands and in doing so does work, which enables the turbine to drive the electric. Also shown on the cover is a compactsize, nonreheating turbine, for which rapid growth is anticipated in the overseas markets. Coal and ash handling plant steam generating plant steam turbine alternator feed water cooling arrangement 5. This technology uses less fossil fuel and result in lower co2 emissions, thereby contributing to the prevention of environment pollution.
Air enters the compressor at 310 k and the turbine at 1400 k. The waste heat from the gas turbine is routed to the nearby steam turbine, which generates extra power. 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. Exergy and efficiency analysis of combined cycle power plant. Comparison between various power plants iiteeeestudents. 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. For understanding the real problem in the plant, need an exergy analysis in every component. One may expect the overall efficiency of a steam thermal power plant to be. High performance equipment for steam and gas turbine power plants. Schematic diagram showing combine power plant with gas turbine. By 2020, 36 per cent of europes electricity production is expected to come from gasfired power plants. 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. Nov 17, 2011 a good friend of environment than steam or nuclear.
Nox reduction in a combined gassteam power plant general. 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. Hybrid solar and coalfired steam power plant with air. 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. The topping cycle is a gas turbine cycle and the bottoming cycle is a nonideal reheat rankine cycle. 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. Comparing combined gas tubrinesteam turbine and marine. Better friend of environment than steam power plant. As far as modern power plant, the overall thermal ency is very less. High performance equipment for steam and gas turbine. In all cases, the intention was to increase efficiency over that of single. Modelling of a power system in a combined cycle power plant.
First, a brief introduction of ffpp fundamentals and con. Combining two or more thermal cycles within a single power plant. The effects of gas emission steam power plant on the. Transient modeling of singlepressure combined cycle power. Feed water and steam flow circuit ii coal and ash circuit iii air and gas circuit iv cooling water circuit. Ntpc national thermal power corporation was set up.
The combustion gases leave the heat exchanger at 247c. Overhauling a gas turbine including power outage is very costintensive. The ccchp plant offers the highest available efficiency in both commercial and. Modelling of a watersteam cycle of the combined cycle. Cogeneration and combined cycle principles workshop chapter 1 principles of cogeneration gryphon international engineering services inc. The gasturbine portion of a combined gassteam power plant has a pressure ratio of 16. America, and is a model of the power plant technology to be constructed overseas in the future. The results of analysis performed are discussed for 10mw power. The chp power station can utilize steam turbines, gas turbines, internal combustion engines or both steam turbines and gas turbines.
Superheating the steam to higher temperatures has very desirable effect. Boiler, turbine, condenser, pump, carnot cycle for steam, disadvantages of carnot cycle application. Combined cycle power plant david grenier master gi 2 2. The topping cycle is a gasturbine cycle and the bottoming cycle is a nonideal reheat rankine cycle. If standby liquid fuel is used, gas fired power plants also need a fuel oil treatment system from gea westfalia separator group. Pdf power plant lecture notes chapter2 steam power. Thermal power plants contents trends and future outlook for thermal power plants 70. In this way, some of the otherwise lost energy can be reclaimed and the specific fuel consumption of the plant can be decreased. Jan 26, 2017 thermal power plantsthey convert heat into energy. How to calculate overall thermal efficiency of combined cycle. The gas turbine exhaust gas flows through a hrsg in which thermal energy of the exhaust gas is used for steam production.
The book gives a comprehensive overview of the combined cycle power plant from a thermodynamic, technical, and economical point of view. Energy efficient solutions for thermal power solutions. A theoretical investigation of efficiency enhancement in. There the combustion, in air, of a fossil fuel such as oil, natural gas, or coal produces hot. Ppt combined cycle power plant linkedin slideshare.
Ger3574g ge combinedcycle product line and performance. 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. Gasturbine cycles typically operate at considerably higher temperatures than steam cycles. 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 method of operating a combined gas steam 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 operate a steam boiler. Treatment systems from gea westfalia separator group therefore protect the core investment of the plant the gas turbine. Sep 22, 20 layout of steam power plant the schematic arrangement of a modern steam power station can be divided into the following stages. Combined cycle thermal power plant, become operational in. 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.
Covers all basic aspects of power plant technology with separate topics by specialist aut hors. 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. Air enters the compressor at 300 k at a rate of 14 kgs and is heated to 1500 k in the combustion chamber. Steam power plant ppt steam power plant presentations. Sep 14, 2016 a schematic diagram of a steam power plant is shown in figure 1. Large landbased electric powerplants built using this. The hrsg supplies highpressure hp and lowpressure lp steam turbine and the deaerator. Pdf study the performance of the combined gas turbine. 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. Inorder to overcome the disadvantages of steam power plant we propose a combined cycle power plant with gas turbine which is shown in fig.
Steam power plant configuration, design, and control. 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. In most countries, this requires an energy mix that includes renewables, gas and coal power generation. Gas turbine based power plants documentos e informes. Organic rankine cycle orcbased thermal power plants have an. The gasturbine cycle of a combined gassteam power plant has a pressure ratio of 12. Various travel mechanisms are used, depending on the applications. Pdf power plant lecture notes chapter4 steam turbine.
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. Optimization simulation, using steel plant offgas for power. The recommended power supply for the semiautomatic fcaw process is a constantvoltage direct current dc machine. 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. Generally, combined cycle power plant is composed of gas turbines, heat recovery steam generators hrsgs, and steam turbines. 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. Stag combined cycle thermal energy and power system features high thermal efficiency low installed cost fuel flexibility wide range of gas and liquid fuels. This cycle combines in tandem, the gas turbine topping cycle with the steam turbine.
1265 1445 521 93 1264 977 849 775 572 1373 1506 129 355 1388 800 936 562 1016 1360 643 464 561 307 912 555 1010 783 298 1188 242 868 1400 666