Download or read book The Deposition of Magnetite Particles from High Velocity Water Onto Isothermal Tubes written by Burrill, K. A and published by Chalk River, Ont. : Chalk River Nuclear Laboratories. This book was released on 1977 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book DEPOSITION OF MAGNETITE PARTICLES FROM HIGH VELOCITY WATER ON TO ISOTHERMAL TUBES written by Atomic Energy of Canada Limited and published by . This book was released on 1974 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fouling Science and Technology written by L. Melo and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fouling of heat exchangers, reactors and catalysts remains one of the most urgent problems facing the process industries. Over the past ten years there has been limited research and investigation into the underlying mechanisms which give rise to this problem. For convenience, particularly in heat exchanger technology, the mechanisms involved have been subdivided into different subject areas. It is often the situation that individuals or groups of workers have concentra ted efforts in one or two of these specialist areas and there is a need to integrate the ideas across the whole spectrum of the subject. In addition, topics such as adhesion and surface phenomena have not been properly taken into account up till now in the assessment of the fouling processes. For this reason it was considered essential that the recognised experts from around the world, who are actively concerned with research, development and design in the fieId, should meet and exchange ideas and experience. Such a meeting was held at Alvor, Portugal, in May 1987, sponsored by the NATO Advanced St~dy Institutes Programme. In order to obtain a common basis for the work of the Advanced Study Institute, the whole technological field was reviewed right from the basic concepts to the frontiers of present knowledge. Each invited contributor was asked to make an overall presentation covering his or her area of expertise.
Download or read book Deposition of Magnetite in High Temperature Boiler Environments written by Balaji Raman and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Suspended magnetite particles in boiler water may deposit in lower orifice headers in forced circulation boilers, impeding flow and causing inefficiencies, ultimately leading to overheating boiler tube failures. The surface charge and zeta potential developed by the suspended particles could be a driving factor in this process. To study the mechanism behind the deposition of suspended magnetite on stainless steel, laboratory-scale experiments were carried out under a range of standard boiler water chemistry, simulating fouling experienced in boiler units. A high-temperaturehigh-pressure electrophoretic deposition cell with provisions to test deposition on metal substrates has been developed. The trends in the deposition processes for the various chemistry were validated using visual observations, surface microscopy, and in situ electrochemical impedance spectroscopy (EIS). A three-electrode assembly design was developed to carry out the in situ electrochemical measurements in various boiler water environments. The experimental setup was successfully used to test boiler water chemistry at 300C (572F) and 10 MPa (1450 psi). The chemistry tested included all-volatile treatment (AVT; oxidizing and reducing using hydrazine), caustic treatment (CT), phosphate treatment (PT), and a filming amine (GE HRSG-02). In addition, the effect of particle size on the deposition process was studied. The experimental results have been explained using established principles of suspended oxide behavior in aqueous environments. The results indicated that the presence of suspended magnetite particles at a pH25C = 9.3, controlled by ammonium hydroxide, caused the particles to aggressively deposit on the stainless steel surface. On the other end of the AVT spectrum, when tested at pH25C = 9.8, no visually observable deposits were found on the surface of the steel. Operating close to the point of zero charge of magnetite at 300 C resulted in deposition and moving away from the point of zero charge mitigated deposition. In case of the caustic treatment and phosphate treatment, it was seen that the compression of the double layer due to the additional electrolytes in the system could influence the deposition process even when the pH of the system was away from the point of zero charge of magnetite at 300C. No significant influence of hydrazine was observed on the deposition of magnetite. Impedance spectroscopy was successfully used in these tests to identify in situ the cases where deposition occurred. The filming amine chemistry did not mitigate deposition completely, but the presence of the HRSG-02 affected the nature of deposits observed on the substrate. Macroscopically the substrate appeared to be covered with deposits and some darker regions. The results of the filming amine study point to possible interactions between the amine-substrate and amine-magnetite. Increasing the particle size distribution clearly showed a decrease in the deposition even though the boiler water chemistry was conducive for deposition. Although, controlling the particle size is not an option for utility boilers, these tests provide further insight into understanding deposition at high temperatures in boiler type environments. In addition to experimental results, the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory has been used to model the behavior of the suspended particles under the AVT boiler water chemistry regime. The DLVO interaction energy curves and the calculated agglomeration probabilities support the experimental observations regarding the deposition of magnetite under the AVT regime. Such calculations can be extended to other treatment chemistries as well providing means to predict the behavior of suspended particles in boiler water. In summary, this study has clearly established a link between the solution chemistry at 300 C (572 F) to the deposition of magnetite on 304 SS. The results show that the zeta potential, which is influenced by the pH of the solution, could be the major factor dictating the susceptibility of deposition at these conditions. EIS was used successfully to establish that magnetite deposition results in high values (> 106 ) of the magnitude of the impedance. Although qualitative, this could provide valuable information when monitoring boilers and power plants for deposition. These results also proved the success of the experimental setup developed in this project for simulating the boiler environments of interest and for studying the deposition phenomena commonly faced in boilers. This study is a one of a kind study focusing purely on the particle attachment aspect of deposition across a wide range of boiler water treatment chemistries with the results supported by surface analyses, impedance spectroscopy and theoretical calculations.
Download or read book Two Phase Flow Heat Exchangers written by Sadik Kakaç and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1090 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-phase flow heat exchangers are vital components of systems for power generation, chemical processing, and thermal environment control. The art and science of the design of such heat exchangers have advanced considerably in recent years. This is due to better understanding of the fundamentals of two-phase flow and heat transfer in simple geometries, greater appreciation of these processes in complex goemetries, and enhanced predictive capability through use of complex computer codes. The subject is clearly of great fundamental and practical importance. The NATO ASIan Thermal-Hydraulic Fundamentals and Design of Two-Phase Flow Heat Exchangers was held in Povoa de Varzim (near Porto), Portugal, July 6-17, 1987. participating in the organization of" the ASI were the Department of Mechanical Engineering and the Clean Energy Research Institute, University of Miami; Universidade do Porto; and the Department of Mechanical Engineering, Aeronautical Eng ineer ing, and Mechanics, Rensselaer Polytechnic Institute. The ASI was arranged primarily as a high-level teaching activity by experts representing both academic and industrial viewpoints. The program included the presentation of invited lectures, a limited number of related technical papers and discussion sessions.
Download or read book Fouling of Heat Transfer Equipment written by E. F. C. Somerscales and published by . This book was released on 1981 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steam Generator Sludge Deposition in Recirculating and Once Through Steam Generator Upper Tube Bundle and Support Plates written by Ronald L. Baker and published by . This book was released on 1992 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindeks written by and published by . This book was released on 1987 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Chemistry of Nuclear Reactor Systems 3 written by British Nuclear Energy Society and published by Thomas Telford Publishing. This book was released on 1983 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of third internationalconference held in Bournemouth on 17-21 October 1983This title is not currently available in print, but to register your interest if it does become available then please click here.
Download or read book Deposition of Magnetite Particles Onto Alloy 800 Steam Generator Tubes written by Marc Basset and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deposition of Magnetite Particles Onto Alloy 800 Steam Generator Tubes microform written by Marc Basset and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1998 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methods for the Characterization of Deposition and Transport of Magnetite Particles in Supercritical Water written by Keigo Karakama and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Chemistry of Nuclear Reactor Systems written by and published by . This book was released on 1981 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book List of Publications written by Atomic Energy of Canada Limited and published by . This book was released on 1976-04 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modelling Magnetite Particle Deposition in Nuclear Steam Generators and Comparisons with Plant Data written by Carver, M. B and published by Chalk River, Ont. : System Chemistry and Corrosion Branch, Chalk River Laboratories. This book was released on 1994 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
