Search

Thisarticleisabout a technical and economicfeasibilitystudyevaluationonthepossibleintegration of a solar thermal energy accumulation power plant withmol tensalts to the Cuban Electric System. Thetechnical-economicevaluation of a 50 MW project in Cuba shows thecurrent and future feasibility in spite of thehighinvestmentcoststhatitsupposes. Thepaperisdistributed in the following way, in the antecedents we state the origin and evolution of this technology, current state of the art of this technology; a world scale installed capacity and its development is described too. After that the operation principle of a solar thermal plant by the Andasol 1 type are shown and the operation possibility is evaluated in Cuba, subsequently the technical requirements are evaluated for the operation of these power stations, the high development areas are presented and was selected the better technical conditions area in which its energy yield is evaluated. At the same time, it has been presented the main advantages and disadvantages too. Finally, it is evaluated economically the interconnection of this solar thermal power plant with the premises approved by the "Unión Eléctrica" for renewable projects under the current conditions besides a forecast toward the 2025. [ABSTRACT FROM AUTHOR]

In this research the oxidation of ASTM A335 P92 steel and the effect of 40% K2SO4 - 60% NaCl salt mixture at temperatures of 500°C to 700°C in intervals of 50°C with exposure times of 1,3,10, 30,100 and 150 hours were evaluated using the standard standardized by the European Federation of Corrosion. Metallographic analysis and hardness analysis were performed before and after the test to identify the possible structural change; evidence of x-ray diffraction (XRD) and scanning electron microscopy (SEM-EDS) were performed to determine the corrosion products present in the steel. By SEM-EDS analysis it is shown that corrosive species such as Cl--, SO4-- do not react with the alloying elements of steel. It was also noted that the oxide layers formed showed stability, and good adhesion which confirms the oxides protection on the metal. The "gained weight by salts deposition" curves showed a parabolic behavior, typical of high temperature materials. [ABSTRACT FROM AUTHOR]

We assessed the corrosion rate of hot-rolled steel coated with a Ni-Cr alloy in the presence of molten salts with a composition of 80% vanadium pentoxide (V2O5) and 20% sodium sulfate (Na2SO4) by weight loss technique. Evaluating the corrosion rate was done by varying the temperature between 650-750 °C for 1, 7 and 22 hours. The Ni- Cr coating obtained by thermal spraying technique produces a coating that reduces the corrosion rate, however, is susceptible to corrosive attack by the molten salts to which the coating is exposed. Found that the corrosion resistance of the coating depends on the nature of the oxide layer, the components of the alloy constituents and salts. [ABSTRACT FROM AUTHOR]

2.25Cr-1Mo ferritic steel is commonly used for the production of superheater tubes for industrial boilers because of its good mechanical properties at high temperatures. However, the ashes produced by the burnt fuel can be deposited on the surface of these components causing hot corrosion due to its chloride and sulfate contents. Oxidation is another phenomenon that can harm the useful life of these components, which when combined with hot corrosion, accelerated corrosion phenomena can appear. This research evaluated oxidation and the effect of the mixture of 40%K2SO4-60%NaCl salts on the 2.25Cr-lMo steel at temperatures between 550 and 650 °C, by using the technical standards issued by the European Federation of Corrosion. Mass gain Vs. time at different temperatures was registered to evaluate the corrosive effect of the salt mixture. X-ray diffraction and metallographic analyses, as well as hardness tests were carried out to identify the products of corrosion and possible micro-structural changes. Also, the corrosion constant, kp, was evaluated by determining the activation energy of the process and, therefore, the possible corrosion mechanism. It was observed that the corrosion rate increased with increased exposure time and temperature, showing a parabolic behavior, indicating a corrosion mechanism controlled by a diffusion process. [ABSTRACT FROM AUTHOR]

Copyright of DYNA - Ingeniería e Industria is the property of Publicaciones Dyna SL and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)