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Pyrolysis And Gasification Of Coal At High Temperatures Quarterly Progress Report No 11 March 15 1990 June 15 1990
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Book Synopsis Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 11, March 15, 1990--June 15, 1990 by :
Download or read book Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 11, March 15, 1990--June 15, 1990 written by and published by . This book was released on 1990 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: We made considerable progress towards completing the development of a thermogravimetric reactor with video microscopy imaging capabilities (TGA/VMI). The video micrOSCOPY components were designed, installed and are currently under testing. With the newly developed TGA/VNH apparatus we can directly observe macroscopic changes in the morphology of pyrolyzing particles and thermal ignitions of burning particles while simultaneously monitoring the weight of pyrolyzing or reacting samples. The systematic investigation on the effects of pyrolysis conditions and char macropore structure on char reactivity continued. Pyrolysis and gasification experiments were performed consecutively in our TGA reactor and the char reactivity patterns were measured for a wide range of temperatures (400--600°C). These conditions cover both the kinetic and the diffusion limited regimes. Our results show conclusively that chars produced at high pyrolysis heating rates (and, therefore, having a more open cellular macropore structure) are more reactive and ignite more easily than chars pyrolyzed at low heating rates. These results have been explained using theoretical models. We also investigated for the first time the effect of coal particle size and external mass transfer limitations on the reactivity patterns and ignition behavior of char particles combusted in air. Finally, we used our hot stage reactor to monitor the structural transformations occurring during pyrolysis via a video microscopy system. Pyrolysis experiments were videotaped and particle swelling and the particle ignitions were determined and analyzed using digitized images from these experiments.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Book Synopsis Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 10, December 15, 1989--March 15, 1990 by :
Download or read book Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 10, December 15, 1989--March 15, 1990 written by and published by . This book was released on 1990 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: We made considerable progress towards developing a thermogravimetric reactor with in-situ video imaging capability (TGA/IVIM). Such a reactor will allow us to observe macroscopic changes in the morphology of pyrolyzing particles and thermal ignitions while monitoring at the time the weight of pyrolyzing or reacting samples. The systematic investigation on the effects of pyrolysis conditions and char macropore structure on char reactivity continued. Pyrolysis and gasification experiments were performed consecutively in our TGA reactor and the char reactivity patterns were measured for a wide range of temperatures (400 to 600°C). These conditions cover both the kinetic and the diffusion limited regimes. Our results show conclusively that chars produced at high pyrolysis heating rates (and, therefore, having a more open cellular macropore structure) are more reactive and ignite more easily than chars pyrolyzed at low heating rates. These results have been explained using available predictions from theoretical models. We also investigated for the first time the effect of coal particle size and external mass transfer limitations on the reactivity patterns and ignition behavior of char particles combusted in air. Finally, we used our hot stage reactor to monitor the structural transformations occurring during pyrolysis via a video microscopy system. Pyrolysis experiments were videotaped and particle swelling and the particle ignitions were determined and analyzed using digitized images from these experiments.
Book Synopsis Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 7, March 15, 1988--June 15, 1989 by :
Download or read book Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 7, March 15, 1988--June 15, 1989 written by and published by . This book was released on 1989 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coals of different ranks will be pyrolyzed in a microscope hot-stage reactor using inert and reacting atmospheres. The macropore structure of the produced chars will be characterized using video microscopy and digital image processing techniques to obtain pore size distributions. Comparative studies will quantify the effect of pyrolysis conditions (heating rates, final heat treatment temperatures, particle size and inert or reacting atmosphere) on the pre structure of the devolatilized chars. The devolatilized chars will be gasified in the regime of strong intraparticle diffusional limitations using 02/N2 and O2/H2O/N2 mixtures. Constant temperature and programmed-temperature experiments in a TGA will be used for these studies. Additional gasification experiments performed in the hot-stage reactor will be videotaped and selected images will be analyzed to obtain quantitative data on particle shrinkage and fragmentation. Discrete mathematical models will be developed and validated using the experimental gasification data.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1993 with total page 1832 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 6, December 15, 1988--March 15, 1989 by :
Download or read book Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 6, December 15, 1988--March 15, 1989 written by and published by . This book was released on 1989 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coals of different ranks will be pyrolyzed in a microscope hot-stage reactor using inert and reacting atmosphere. The macropore structure of the produced chars will be characterized using video microscopy and digital image processing techniques to obtain pore size distributions. Comparative studies will quantify the effect of pyrolysis conditions (heating rates, final heat treatment temperatures, particle size and inert or reacting atmosphere) on the pore structure of the devolatilized chars. The devolatilized chars will be gasified in the regime of strong intraparticle diffusional limitations using O2/N2 and O2/H2O/N22 mixtures. Constant temperature and programmed-temperature experiments in a TCA will be used for these studies. Additional gasification experiments performed in the hot-stage reactor will be videotaped and selected images will be analyzed to obtain quantitative data on particle shrinkage and fragmentation.
Book Synopsis Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 8, June 15, 1989--September 15, 1989 by :
Download or read book Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 8, June 15, 1989--September 15, 1989 written by and published by . This book was released on 1989 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coals of different ranks will be pyrolyzed in a microscope hot-stage reactor using inert and reacting atmospheres. The macropore structure of the produced chars will be characterized using video microscopy and digital image processing techniques to obtain pore size distributions. Comparative studies will quantify the effect of pyrolysis conditions (heating rates, final heat treatment temperatures, particle size and inert or reacting atmosphere) on the pore structure of the devolatilized chars. The devolatilized chars will be gasified in the regime of strong intraparticle diffusional limitations using O2/N2 and O2/H2O/N2 mixtures. Constant temperature and programmed-temperature experiments in a TGA will be used for these studies. Additional gasification experiments performed in the hot-stage reactor will be videotaped and selected images will be analyzed to obtain quantitative data on particle shrinkage and fragmentation. Discrete mathematical models will be developed and validated using the experimental gasification data.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1993-07 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 9, September 15, 1989--December 15, 1989 by :
Download or read book Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 9, September 15, 1989--December 15, 1989 written by and published by . This book was released on 1989 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coals of different ranks will be pyrolyzed in a microscope hot-stage reactor using inert and reacting atmospheres. The macropore structure oft he produced chars will be characterized using video microscopy and digital image processing techniques to obtain pore size distributions. Comparative studies will quantify the effect of pyrolysis conditions (heating rates, final heat treatment temperatures, particle size and inert or reacting atmosphere) on the pore structure of the devolatilized chars. The devolatilized chars will be gasified in the regime of strong intraparticle diffusional limitations using O2/N2 and O2/H2/N2 mixtures. Constant temperature and programmed-temperature experiments in a TGA will be used for these studies. Additional gasification experiments performed in the hot-stage reactor will be videotaped and selected images will be analyzed to obtain quantitative data on particle shrinkage and fragmentation.
Book Synopsis Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 5, September 15, 1988--December 15, 1988 by :
Download or read book Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 5, September 15, 1988--December 15, 1988 written by and published by . This book was released on 1988 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coals of different ranks will be pyrolyzed in a microscope hot-stage reactor using inert and reacting atmospheres. The macropore structure of the produced chars will be characterized using video microscopy and digital image processing techniques to obtain pore size distributions. Comparative studies will quantify the effect of pyrolysis conditions (heating rates, final heat treatment temperatures, particle size and inert or reacting atmosphere) on the pore structure of the devolatilized chars. The devolatilized chars will be gasified in the regime of strong intraparticle diffusional limitations using O2/N2 and O2/H2O/N22 mixtures. Constant temperature and programmed-temperature experiments in a TGA will be used for these studies. Additional gasification experiments performed in the hot-stage reactor will be videotaped and selected images will be analyzed to obtain quantitative data on particle shrinkage and fragmentation. Discrete mathematical models will be developed and validated using the experimental gasification data.
Book Synopsis Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 2, December 15, 1987--March 15, 1988 by :
Download or read book Pyrolysis and Gasification of Coal at High Temperatures. Quarterly Progress Report No. 2, December 15, 1987--March 15, 1988 written by and published by . This book was released on 1988 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of particle size on the macropore structure of chars produced from an Illinois No. 6 coal were investigated. Three size fractions (100--120, 50--60 and 25--28 mesh) of coal particles were pyrolyzed in our captive-sample reactor at 10°C/s. By analyzing digitized particle cross-sections, we obtained the macropore volume distributions and surface areas, and determined that all three char samples had almost equal macroporosities. we have also analyzed for the first time the shape or boundary tortuosity of the macropores. As the size of the pyrolyzed coal particles increased, the produced chars exhibited macropores with more tortuous boundaries. Tortuous pore boundaries result in higher values for the true macropore surface areas and should enhance the reactivity of the char samples. A systematic procedure was developed for analyzing and averaging the simulation results obtained with our erosion models. Such a procedure is necessary for comparing statistical model predictions to experimental data. Several simulations were carried out to investigate the gasification behavior of the three char samples mentioned above and the predicted reactivity patterns are presented. Finally, a thermogravimetric analyzer (TGS-2) was ordered and will soon be delivered to our laboratory.
Book Synopsis Pyrolysis and Gasification of Coal at High Temperatures. Annual Progress Report No. 1, September 15, 1987--September 15, 1988 by :
Download or read book Pyrolysis and Gasification of Coal at High Temperatures. Annual Progress Report No. 1, September 15, 1987--September 15, 1988 written by and published by . This book was released on 1988 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particles from two parent coals (Illinois {number_sign}6 and lignite) were pyrolyzed in a nitrogen atmosphere using a captive sample microreactor capable of achieving heating rates as high as 1000°C/s. Direct measurements on digitized image of char particle cross-sections and a stereological model were used to characterize the macropore structure of chars. Macroporosites, pore size distributions and surface areas were accurately measured allowing us to quantify the effects of pyrolysis heating rates and coal particle size. We have paid particular attention to the development of image analysis software that has allowed us to analyze for the first time the shape or bounary tortuosity of the macropores. Tortuous pore boundaries result in higher values for the true macropore surface areas and should enhance the reactivity of the char samples. Another contribution of the current research program is the development of probabilisitic gasification models that work on computational grids obtained from digitized images of actual cross-sections of char particles. These digital images are accurate discrete approximations of a slice of the actual reacting solid. The incorporation of sophisticated image processing technique is perhaps the most attractive feature of the new simulation approach. Preliminary results indicate that the probabilistic models can accurately account for the opening of closed porosity and fragmentation phenomena occurring during gasification at high temperatures.
Download or read book Fossil Energy Update written by and published by . This book was released on 1982 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solar Energy Update written by and published by . This book was released on 1980 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index: Keyword A-L by :
Download or read book Government Reports Annual Index: Keyword A-L written by and published by . This book was released on 1987 with total page 1260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pyrolysis and Gasification of Coal at High Temperatures. Final Technical Report, September 15, 1987--September 14, 1991 by :
Download or read book Pyrolysis and Gasification of Coal at High Temperatures. Final Technical Report, September 15, 1987--September 14, 1991 written by and published by . This book was released on 1992 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: The macropore structure of chars is a major factor in determining their reactivity during the gasification stage. The major objectives of this contract were to (a) quantify by direct measurements the effect of pyrolysis conditions of the macropore structure, and (b) establish how the macropores affected the reactivity pattern, the ignition behavior and the fragmentation of the char particles during gasification in the regime of strong diffusional limitations. Results from this project provide much needed information on the factors that affect the quality of the solid products (chars) of coal utilization processes (for example, mild gasification processes). The reactivity data will also provide essential parameters for the optimal design of coal gasification processes. (VC).
Book Synopsis Basic studies of coal pyrolysis and hydrogasification by : Massachusetts Institute of Technology. Energy Laboratory
Download or read book Basic studies of coal pyrolysis and hydrogasification written by Massachusetts Institute of Technology. Energy Laboratory and published by . This book was released on 1978 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
