Download or read book Study of Internal Reaction During Thermal Oxidation of Carbon graphite Materials written by L. N. Shein and published by . This book was released on 1969 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: The kinetics of thermal oxidative pretreating of pressed work pieces containing coke, natural graphite and coal pitch were experimentally studied and theoretically analyzed to define the effects of adsorption and diffusion involving the porous body and the pitch binder coating the pore surfaces. The material used in experimental measurements comprised 65 percent pyrolytic petroleum coke, 5 percent natural graphite, and 30 percent Magnitogorsk coal pitch. The transition of the pitch binder into a solid material and the migration of the reaction zone from the surface in the center of the sample were determined from the yield of volatile materials by a published technique at 200 and 240 C. The effective diffusion coefficient was derived by correlating the yield of volatile products, the amount of consumed oxygen, and the change of gas yield with time. The amount of oxygen penetrating the material and its concentration gradient were derived. The porosity was measured and mathematical models were derived defining the effective diffusion coefficient as a function of porosity and pore structure. The effect of temperature on diffusion was considered. The nonisothermal condition of the process was experimentally determined and discussed and it was shown that the migration of reaction zones is the main factor limiting the usability of the process. (Author).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research Development Reports written by and published by . This book was released on 1970 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Reacting Surface Density on the Overall Graphite Oxidation Rate written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphite oxidation in an air-ingress accident is presently a very important issue for the reactor safety of the very high temperature gas cooled-reactor (VHTR), the concept of the next generation nuclear plant (NGNP) because of its potential problems such as mechanical degradation of the supporting graphite in the lower plenum of the VHTR might lead to core collapse if the countermeasure is taken carefully. The oxidation process of graphite has known to be affected by various factors, including temperature, pressure, oxygen concentration, types of graphite, graphite shape and size, flow distribution, etc. However, our recent study reveals that the internal pore characteristics play very important roles in the overall graphite oxidation rate. One of the main issues regarding graphite oxidation is the potential core collapse problem that may occur following the degradation of graphite mechanical strength. In analyzing this phenomenon, it is very important to understand the relationship between the degree of oxidization and strength degradation. In addition, the change of oxidation rate by graphite oxidation degree characterization by burn-off (ratio of the oxidized graphite density to the original density) should be quantified because graphite strength degradation is followed by graphite density decrease, which highly affects oxidation rates and patterns. Because the density change is proportional to the internal pore surface area, they should be quantified in advance. In order to understand the above issues, the following experiments were performed: (1)Experiment on the fracture of the oxidized graphite and validation of the previous correlations, (2) Experiment on the change of oxidation rate using graphite density and data collection, (3) Measure the BET surface area of the graphite. The experiments were performed using H451 (Great Lakes Carbon Corporation) and IG-110 (Toyo Tanso Co., Ltd) graphite. The reason for the use of those graphite materials is because their chemical and mechanical characteristics are well identified by the previous investigations, and therefore it was convenient for us to access the published data, and to apply and validate our new methodologies. This paper presents preliminary results of compressive strength vs. burn-off and surface area density vs. burn-off, which can be used for the nuclear graphite selection for the NGNP.
Download or read book Oxidation of Carbon at High Temperatures written by Howard G. Maahs and published by . This book was released on 1971 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Thermal Stability of Graphite Oxide Like Materials written by and published by . This book was released on 1997 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fuel Abstracts and Current Titles written by and published by . This book was released on 1969 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fossil Energy Update written by and published by . This book was released on 1981 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research and Development Reports Index written by and published by . This book was released on 1970 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Activated Carbon written by Harry Marsh and published by Elsevier. This book was released on 2006-07-12 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent years have seen an expansion in speciality uses of activated carbons including medicine, filtration, and the purification of liquids and gaseous media. Much of current research and information surrounding the nature and use of activated carbon is scattered throughout various literature, which has created the need for an up-to-date comprehensive and integrated review reference. In this book, special attention is paid to porosities in all forms of carbon, and to the modern-day materials which use activated carbons - including fibres, clothes, felts and monoliths. In addition, the use of activated carbon in its granular and powder forms to facilitate usage in liquid and gaseous media is explored. Activated Carbon will make essential reading for Material Scientists, Chemists and Engineers in academia and industry. - Characterization of porosity - The surface chemistry of the carbons - Methods of activation and mechanisms of adsorptio - Computer modelling of structure and porosity within carbons - Modern instrumental analytical methods
Download or read book Energy Research Abstracts written by and published by . This book was released on 1986 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications Reports and Papers for 1966 from Oak Ridge National Laboratory written by F. M. O'Hara and published by . This book was released on 1967 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Index written by and published by . This book was released on 1975 with total page 1096 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1974 with total page 1088 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1970 with total page 1318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research Reports written by and published by . This book was released on 1963 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
