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Modular Solar Energy Systems
Published in Yatish T. Shah, Modular Systems for Energy and Fuel Recovery and Conversion, 2019
In a combined cycle power plant, the gas turbine’s exhaust gases are used to produce high-pressure steam, which in turn generates additional power through a steam turbine. If required, low-pressure steam can be extracted from the steam turbine to feed a thermal load. Solar’s solution, using absorption chillers to cool down the combustion air, keeps the gas turbines running at optimum output and efficiency, regardless of ambient conditions. Flexibility is achieved due to a multiple gas turbine plant concept, allowing the combined cycle plant to follow electrical load fluctuations with minimum impact on overall efficiency. Its typical installation places include Airports.Industrial zones.Factories.Municipalities.
Introduction to Biofuels
Published in K.A. Subramanian, Biofueled Reciprocating Internal Combustion Engines, 2017
Internal combustion engines are also used extensively in decentralized power generation sectors. Almost all type of large-scale manufacturers have internal combustion engine generator sets that require several megawatts of electricity. The required power demand is generally met by either a gas turbine power plant or a steam turbine power plant. Currently, combined cycle power plant (gas turbine + steam turbine) use has increased in order to utilize waste heat from gas turbine exhaust as well as meeting the combined requirement of electricity and heat (in the form of steam), which is called combined heat and power (CHP). Internal combustion engine generators can provide supplementary power supply to these power plants due to the following reasons:
Overview of Electric Power Generation Systems
Published in João P. S. Catalão, Electric Power Systems, 2017
In addition to steam thermal power plants, there are two other types of plants based on fossil fuels. One of these is the gas turbine power plants, in which turbines gas is burned with air under pressure and the turbine converts the high temperature and pressure into mechanical energy converted into electricity by the power generator coupled to the same axe. The other type of thermal power plant is the combined-cycle type. This type combines a closed-loop steam cycle turbine with an open-cycle gas turbine. The main cycle is the gas turbine cycle, in which a compressor, coupled to the turbine axe, absorbs, compresses, and injects air into the combustion chamber. The hot gas expands in the turbine, making the first extraction of mechanical energy. From this first stage, the resulting gas that remains at a relatively high temperature is used to produce steam and operate the steam turbine, taking full advantage of the calorific value of fuel. The combined-cycle power plant has a high efficiency of about 60%. The plant also has the advantage of flexibility—it can operate with a fast start or fast ramping similar to typical gas turbines. In terms of operation, a combined-cycle power plant can have a cold start in just 1–2 h, but if needed, this time can be just a few minutes starting as a simple gas turbine. For this reason, and for economic and environmental advantages associated with the use of natural gas as fuel, the use of the combined-cycle plant is growing. The good competition of investment and operating costs makes a combined-cycle power plant a very interesting solution for countries that have natural gas available with some security of supply.
Cascade neural network algorithm with analytical connection weights determination for modelling operations and energy applications
Published in International Journal of Production Research, 2020
Zhengxu Wang, Waqar Ahmed Khan, Hoi-Lam Ma, Xin Wen
(1) Combined cycle power plant: A combined cycle power plant is used to generate electricity from gas turbines and consequently uses the waste energy in a steam turbine to improve the efficiency of the electrical output. The attributes that considerably affect the performance of gas turbine are atmospheric pressure (millibar), temperature (°C) and relative humidity (%), whereas, the attributes that affect the performance of the steam turbine are exhaust steam pressure (cm Hg). The dataset contains an hourly average of attributes (atmospheric pressure, temperature and relative humidity, exhaust steam pressure) to predict the net hourly electrical energy (MW) of the powerplant.