The Experts below are selected from a list of 16605 Experts worldwide ranked by ideXlab platform
Wolf-dieter Steinmann - One of the best experts on this subject based on the ideXlab platform.
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Thermal energy storage for direct steam generation
Solar Energy, 2011Co-Authors: Doerte Laing, Dorothea Lehmann, Carsten Bahl, Thomas Bauer, Wolf-dieter SteinmannAbstract:Abstract Parabolic trough Power Plants with direct steam generation are a promising option for future cost reduction in comparison to the SEGS type technology. These new solar thermal Power Plants require innovative storage concepts, where the two-phase heat transfer fluid poses a major challenge. A three-part storage system is proposed where a phase change material (PCM) storage will be deployed for the two-phase evaporation, while concrete storage will be used for storing sensible heat, i.e. for preheating of water and superheating of steam. A storage system with a total storage capacity of approx. 1 MW h is described, combining a PCM module and a concrete module. The storage modules have been constructed for testing in a DSG-test facility specially erected at a Conventional Power Plant of Endesa in Carboneras (Spain). Commissioning of the storage system started in May 2010; testing under real steam conditions around 100 bar will begin in August 2010.
Alejandro Zaleta-aguilar - One of the best experts on this subject based on the ideXlab platform.
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Assessing the Exergy Costs of a 332-MW Pulverized Coal-Fired Boiler
MDPI AG, 2016Co-Authors: Victor H. Rangel-hernandez, Cesar Damian-ascencio, Juan M. Belman-flores, Alejandro Zaleta-aguilarAbstract:In this paper, we analyze the exergy costs of a real large industrial boiler with the aim of improving efficiency. Specifically, the 350-MW front-fired, natural circulation, single reheat and balanced draft coal-fired boiler forms part of a 1050-MW Conventional Power Plant located in Spain. We start with a diagram of the Power Plant, followed by a formulation of the exergy cost allocation problem to determine the exergy cost of the product of the boiler as a whole and the expenses of the individual components and energy streams. We also define a productive structure of the system. Furthermore, a proposal for including the exergy of radiation is provided in this study. Our results show that the unit exergy cost of the product of the boiler goes from 2.352 to 2.5, and that the maximum values are located in the ancillary electrical devices, such as induced-draft fans and coil heaters. Finally, radiation does not have an effect on the electricity cost, but affects at least 30% of the unit exergy cost of the boiler’s product
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Thermodynamic characterization of the Power loss factor in steam turbines
Energy Conversion and Management, 2002Co-Authors: Alejandro Zaleta-aguilar, Luis F Vega, Armando Gallegos-muñoz, Abel Hernandez-guerreroAbstract:Abstract Erosion, roughness, steam path damage etc., are factors that reduce the Power capacity in a steam turbine (ST). Any Power loss occurring locally in intermediate stages of a ST results in more available energy in the downstream stages. This effect is well known as the loss factor (LF) [Steam Turbines and Their Cycles, Krieger, NY, USA, 1974; Steam and Gas Turbines, McGraw-Hill, NY, USA, 1927; Steam Turbines Theory and Design, McGraw-Hill, NY, USA, 1984]. Currently, it is calculated by graphical methods [Evaluting and Improving Steam Turbine Performance, Gilson, NY, USA, 1993]. In this work, a new thermodynamic expression for the LF is introduced in order to improve applications to evaluate malfunctions in the first and intermediate stages of STs. The proposed thermodynamic expression for the LF is based on second law analysis and concepts like the internal parameter θ , and the dissipation temperature T d [Las Ecuaciones Caracteristicas, Doctoral Thesis, University of Zaragoza, 1992]. To show the main features and easiness of application of the proposed method, a 158 MW Conventional Power Plant is analyzed, comparing the classical graphical method [Evaluating and Improving Steam Turbine performance, Gilson, NY, USA, 1993; Simplified Performance Test of Steam Turbines, ASME, NY, USA, 1970] and the proposed expression of the LF. Special emphasis is made on the thermoeconomical deviations that could arise by an imprecise application of the LF Method during an energy audit of the steam turbine internal parts.
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Thermodynamic Model of the Loss Factor Applied to Steam Turbines
International Journal of Thermodynamics, 2001Co-Authors: Alejandro Zaleta-aguilar, Javier Royo, Antonio ValeroAbstract:Erosion, roughness, steam path damage, etc., are factors that reduce Power capacity in a steam turbine. Any Power loss occurring locally in intermediate stages of a steam turbine results in more available energy in the downstream stages, this effect is well known as the Loss Factor (Salisbury, 1974; Stodola, 1927; Husain, 1984). Currently, the Loss Factor is been calculated by graphical methods (Cotton, 1996). In this work a new thermodynamic expression for the Loss Factor (LF) is introduced, in order to improve applications to evaluate malfunctions in the first and intermediate stages of steam turbines. The new thermodynamic expression for the Loss Factor, is based on Second Law Analysis; and concepts like the internal parameter θ, and the dissipation temperature Td; (Royo, 1992). An Example of a steam turbine in a Conventional Power Plant of 158 MW is analyzed by comparing a classical graphical method (ASME/ANSI PTC-6, 1970; and Cotton, 1993), and the proposed expression of the Loss Factor (LF). Special emphasis is made on the thermoeconomical deviations that could arise by an imprecise application of the Loss Factor Method, during an energy audit of the steam turbine internal parts.
Mohammad Amin Latify - One of the best experts on this subject based on the ideXlab platform.
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economics of energy storage options to support a Conventional Power Plant a stochastic approach for optimal energy storage sizing
Journal of energy storage, 2021Co-Authors: Mohammad Reza Sheibani, Reza G Yousefi, Mohammad Amin LatifyAbstract:Abstract Is an energy storage system (ESS) an economic choice to enhance the flexibility and controllability of a Conventional Power Plant (CPP)? So far, most literatures have investigated the profitability of ESSs beside renewable Power Plants (RESs). The focus of this paper is on economic assessment of an ESS alongside a CPP in a price taker generation company (GENCO). This work presents a method to determine economic storage technology options and their optimal Power and energy capacities. A stochastic price based unit commitment (PBUC) conjugated with a stochastic price based storage commitment (PBSC) is developed in the ESS sizing problem. The output determines the optimal participation of a Power Plant and its optimum sized ESS in day-ahead energy and spinning reserve markets and bilateral contracts. Numerical results confirm the capability of the proposed model to improve the operational characteristics of the CPPs and to increase the profitability of GENCOs. The results show that the ESS increases the GENCOs' profit by up to 36%. The ESS, using the proposed model, can reduce the number of on line hours of the CPP about 13%. Also, the GENCO can offer about 10% lower price for bilateral contracts.
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Stochastic price based coordinated operation planning of energy storage system and Conventional Power Plant
Journal of Modern Power Systems and Clean Energy, 2019Co-Authors: Mohammad Reza Sheibani, Gholam Reza Yousefi, Mohammad Amin LatifyAbstract:A generation company (GENCO) which has a Conventional Power Plant (CPP) intends to add an energy storage system (ESS) beside the CPP to increase its flexibility and profitability. For this purpose, a new model is proposed for coordinated operation planning of the CPP and ESS in energy and spinning reserve markets in the presence of a bilateral contract. The proposed model is based on the stochastic price based unit commitment (PBUC) and price based storage commitment (PBSC). The uncertainties of the energy and spinning reserve prices and delivery requests in the spinning reserve market are modeled via scenarios based upon historical data. The proposed model maximizes the profitability of the ESS beside the CPP and encourages the GENCO to invest the ESS. ESS technology options to use beside the CPP are determined by economic assessments. Numerical results show that utilization of ESSs improves the technical operation of CPPs, as well as GENCOs’ profitability.
Zhe Chen - One of the best experts on this subject based on the ideXlab platform.
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coordination control of a novel wind farm configuration including a hydrogen storage system and a gas turbine
Energies, 2016Co-Authors: Shihua Xuan, Weihao Hu, Jun Yao, Zhe ChenAbstract:This paper proposes a novel configuration that combines wind turbines, an electrolyzer, and a gas turbine with the corresponding generator. A control strategy for this configuration is also proposed. The purpose of this configuration and its control strategy is to make the wind farm work like a Conventional Power Plant from a grid’s point of view. The final proposed configuration works properly with the proposed control strategy, the three times per revolution (3p) oscillation frequency is removed and the output Power fluctuations caused by wind fluctuation are compensated. The final Power output of the proposed configuration is constant like that of a Conventional Power Plant, and it can change according to the different requirements of the transmission system operator.
Abel Hernandez-guerrero - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic characterization of the Power loss factor in steam turbines
Energy Conversion and Management, 2002Co-Authors: Alejandro Zaleta-aguilar, Luis F Vega, Armando Gallegos-muñoz, Abel Hernandez-guerreroAbstract:Abstract Erosion, roughness, steam path damage etc., are factors that reduce the Power capacity in a steam turbine (ST). Any Power loss occurring locally in intermediate stages of a ST results in more available energy in the downstream stages. This effect is well known as the loss factor (LF) [Steam Turbines and Their Cycles, Krieger, NY, USA, 1974; Steam and Gas Turbines, McGraw-Hill, NY, USA, 1927; Steam Turbines Theory and Design, McGraw-Hill, NY, USA, 1984]. Currently, it is calculated by graphical methods [Evaluting and Improving Steam Turbine Performance, Gilson, NY, USA, 1993]. In this work, a new thermodynamic expression for the LF is introduced in order to improve applications to evaluate malfunctions in the first and intermediate stages of STs. The proposed thermodynamic expression for the LF is based on second law analysis and concepts like the internal parameter θ , and the dissipation temperature T d [Las Ecuaciones Caracteristicas, Doctoral Thesis, University of Zaragoza, 1992]. To show the main features and easiness of application of the proposed method, a 158 MW Conventional Power Plant is analyzed, comparing the classical graphical method [Evaluating and Improving Steam Turbine performance, Gilson, NY, USA, 1993; Simplified Performance Test of Steam Turbines, ASME, NY, USA, 1970] and the proposed expression of the LF. Special emphasis is made on the thermoeconomical deviations that could arise by an imprecise application of the LF Method during an energy audit of the steam turbine internal parts.