The Experts below are selected from a list of 166335 Experts worldwide ranked by ideXlab platform
A. A. Frantseva - One of the best experts on this subject based on the ideXlab platform.
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Topping with a Natural Gas-Fired Combined Cycle Unit of a Coal-Fired Cogeneration Power Plant with Cross Connections
Thermal Engineering, 2021Co-Authors: O. V. Borush, P. A. Shchinnikov, A. A. FrantsevaAbstract:Thermal power plants (TPP) with cross connections and having a minimum reference fuel rate of 321 g/(kW h) prevail in the structure of the generating capacities in Russia. In practice, this characteristic is often above 500 g/(kW h). Application of parallel-type, dual-fuel Combined-Cycle Units (CCUs) using coal as the main fuel, for improving the efficiency of power plants with cross connections is considered. Such CCUs have high efficiency and are suitable for modernization of operating subcritical power plants with cross connections. The power of CCUs with gas turbines manufactured in Russia or having a high degree of production localization in Russia can be as high as 200–250 MW. In all the cases, a new heat-recovery steam generator (HRSG) and a new steam turbine for a live-steam pressure of 12.8 and 8.8 MPa must be developed. The paper considers the process features of such dual-fuel cogeneration CCUs based on a 6FA gas turbine. A CCU thermal scheme is developed. Bled steam conditions under different operating conditions are determined considering the bypass of the main condensate and feedwater lines. GCU performance indices as a function of ambient air temperature are determined. In addition, an option was considered for modernizing the existing cogeneration power plant (TETs) in the town of Seversk by implementation of a dual-fuel CCU based on an 82 MW 6FA gas turbine and a T-96/122-8.8 steam turbine while maintaining the coal-fired power steam boilers in operation. It is demonstrated that the proposed modernization option makes it possible to reduce the fuel cost by approximately 240 million rubles per year while increasing the electricity delivery under cogeneration conditions by 1.7 times.
V I Breus - One of the best experts on this subject based on the ideXlab platform.
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damage to steam generating tubes of low pressure circuit of drum type heat recovery boiler used in the pgu 450 combined cycle Unit at severozapadnaya cogeneration plant
Thermal Engineering, 2009Co-Authors: V I Nikitin, I I Belyakov, V I BreusAbstract:The results of investigation into the nature of damage to tube bends of the low-pressure evaporator of the P-90 heat recovery boiler installed at the Severozapadnaya cogeneration plant are presented. It has been found that damage was caused by cavitation wear due to action of steam-water flow.
Luis Vargas - One of the best experts on this subject based on the ideXlab platform.
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fuzzy predictive supervisory control based on genetic algorithms for gas turbines of combined cycle power plants
IEEE Transactions on Energy Conversion, 2007Co-Authors: Doris Saez, Freddy Milla, Luis VargasAbstract:This work presents a novel design and development of a fuzzy predictive supervisory controller, based on genetic algorithms (GA), for gas turbines of combined cycle Units. The control design is based on an objective function that represents the economic and regulatory performance of a gas turbine by using a dynamic optimal set-point for the regulatory level. A fuzzy model is considered in order to characterize the nonlinear behavior of the gas turbine, which is used in two supervisory control systems. The first fuzzy supervisory control design includes a fuzzy model, where its parameters are held constant for the successive predictions. For the second fuzzy supervisory control design, its parameters are updated in each prediction and its nonlinear optimization problem is solved using GAs. The proposed fuzzy supervisory controllers are compared against a supervisory controller based on linear models and a regulatory controller with constant optimal set-points. Results indicate that the fuzzy GA predictive supervisory controller captures adequately the nonlinearities of the process, which, in turn, provides a promising approach to improve the performance of the combined cycle Unit.
Arturo Losi - One of the best experts on this subject based on the ideXlab platform.
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combined cycle Unit commitment in a changing electricity market scenario
International Journal of Electrical Power & Energy Systems, 2015Co-Authors: Giovanni Mercurio Casolino, Giampaolo Liuzzi, Arturo LosiAbstract:Abstract For Generation Companies (GENCOs) one of the most relevant issue is the commitment of the Units, the scheduling of them over a daily (or longer) time frame, with the aim of obtaining the best profit. It strongly depends on the plant operational generation costs, which depend in turn on the choices taken at the design stage; it follows that design technical choices should also aim at determining the best generation cost structure of generating Units with respect to the market opportUnities. In the paper the Unit commitment (UC) problem has been considered, with highlights on changes in the market scenario. The paper analyzes the relevance of some design choices (structure, size, regulation type) on the economics of the operation of gas–steam combined cycle generating Units. To solve the UC problem, a recently proposed method for mixed integer nonlinear programming problems, with the use of a derivative free algorithm to solve the continuous subproblems, has been considered. The results for two GENCOs are reported: one managing a single Unit and the other managing three Units. Numerical examples show the sensitivity of the UC solutions to the market conditions and to the design choices on the regulation type in the evolving scenario of the Italian Electricity Market.
O. V. Borush - One of the best experts on this subject based on the ideXlab platform.
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Topping with a Natural Gas-Fired Combined Cycle Unit of a Coal-Fired Cogeneration Power Plant with Cross Connections
Thermal Engineering, 2021Co-Authors: O. V. Borush, P. A. Shchinnikov, A. A. FrantsevaAbstract:Thermal power plants (TPP) with cross connections and having a minimum reference fuel rate of 321 g/(kW h) prevail in the structure of the generating capacities in Russia. In practice, this characteristic is often above 500 g/(kW h). Application of parallel-type, dual-fuel Combined-Cycle Units (CCUs) using coal as the main fuel, for improving the efficiency of power plants with cross connections is considered. Such CCUs have high efficiency and are suitable for modernization of operating subcritical power plants with cross connections. The power of CCUs with gas turbines manufactured in Russia or having a high degree of production localization in Russia can be as high as 200–250 MW. In all the cases, a new heat-recovery steam generator (HRSG) and a new steam turbine for a live-steam pressure of 12.8 and 8.8 MPa must be developed. The paper considers the process features of such dual-fuel cogeneration CCUs based on a 6FA gas turbine. A CCU thermal scheme is developed. Bled steam conditions under different operating conditions are determined considering the bypass of the main condensate and feedwater lines. GCU performance indices as a function of ambient air temperature are determined. In addition, an option was considered for modernizing the existing cogeneration power plant (TETs) in the town of Seversk by implementation of a dual-fuel CCU based on an 82 MW 6FA gas turbine and a T-96/122-8.8 steam turbine while maintaining the coal-fired power steam boilers in operation. It is demonstrated that the proposed modernization option makes it possible to reduce the fuel cost by approximately 240 million rubles per year while increasing the electricity delivery under cogeneration conditions by 1.7 times.