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Download or read book Ash and Pulverized Coal Deposition in Combustors and Gasifiers. Quarterly Technical Progress Report, July 1-September 30, 1995 written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ash & Pulverized Coal Deposition in Combustors & Gasifiers. Quarterly Technical Progress Report, April 1, 1995-June 30, 1995 written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ash & Pulverized Coal Deposition in Combustors & Gasifiers, Quarterly Technical Progress Report, October 1, 1995-December 31, 1995 written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ash and Pulverized Coal Deposition in Combustors and Gasifiers. Quarterly Technical Progress Report, October 1-December 31, 1994 written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 802 pages
Book Rating : 4.3/5 (129 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 802 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.
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ISBN 13 :
Total Pages : 586 pages
Book Rating : 4.3/5 (129 download)
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1996 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Total Pages : 872 pages
Book Rating : 4.3/5 (129 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Mineral Transformations and Ash Deposition During Staged Combustion, Quarterly Technical Progress Report, April 1, 1995-June 30, 1995 written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Suppression of Fine Ash Formation in Pulverized Coal Flames. Quarterly Technical Progress Report No. 4, July 1, 1993--September 30, 1993 written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Laboratory work and studies of full-scale coal-fired boilers have identified two general mechanisms for ash production. The vast majority of the ash is formed from mineral matter that coalesces as the char burns, yielding particles that are normally larger than 0.5 [mu]m. The second major mechanism is the generation of a submicron aerosol through a vaporization/condensation mechanism. Previous work has shown that pulverized bituminous coals that were treated by coal cleaning (via froth flotation) or aerodynamic sizing exhibited altered aerosol emission characteristics. Specifically, the emissions of aerosol for the cleaned and sized coals increased by as much as one order of magnitude. The goals of the present progress are to: (1) perform measurements on carefully characterized coals to identify the means by which the coal treatment increases aerosol yields; (2) investigate means by which coal cleaning can be done in a way that will not increase aerosol yields; (3) identify whether this mechanism can be used to reduce aerosol yields from systems burning straight coal. This paper discusses model description and model formulation, and reports on the progress of furnace design and construction, and coal selection.
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Total Pages : 5 pages
Book Rating : 4.:/5 (873 download)
Download or read book Suppression of Fine Ash Formation in Pulverized Coal Flames. Quarterly Technical Progress Report No. 3, April 1, 1993--June 30, 1993 written by and published by . This book was released on 1993 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the major obstacles to the economical use of coal is managing the behavior of its mineral matter. Ash size and composition are of critical importance for a variety of reasons. Fly ash size and emissivity affect radiant furnace heat transfer. Heat transfer is also affected by the tendency of ash to adhere to heat transfer surfaces, and the properties of these deposits. Removal of ash from flue gas by electrostatic precipitators is influenced by both particle size and particle resistivity. The efficiency of fabric filter-based cleaning devices is also influenced by ash size. Both types of devices have reduced collection efficiencies for smaller-sized particles, which corresponds to the size most efficiently retained in the alveolar region of the human lung. Laboratory work and studies of full-scale coal-fired boilers have identified two general mechanisms for ash production. The vast majority of the ash is formed from mineral matter that coalesces as the char burns, yielding particles that are normally larger than 0.5 [mu]m. The second major mechanism is the generation of a submicron aerosol through a vaporization/condensation mechanism. Although these particles represent a relatively small fraction of the mass, they can present a large fraction of the surface area. Thus, they are a preferred site for the condensation of the more volatile oxides later in the furnace. This leads to a layering effect in which the refractory oxides are concentrated at the particle core and the more volatile oxides reside at the surface. This also explains the enrichment of the aerosol by volatile oxides that has been noted in samples from practical furnaces. These volatile metal oxides include the majority of the toxic metal contaminants, e.g., mercury, arsenic, selenium and nickel. Risk assessment studies suggest that toxic metal emissions represent a significant portion of the health risk associated with combustion.
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ISBN 13 :
Total Pages : 1256 pages
Book Rating : 4.3/5 (129 download)
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Mineral Transformations and Ash Deposition During Staged Combustion. Quarterly Technical Progress Report, July 1- September 30, 1994 written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (685 download)
Download or read book Investigation of Mineral Transformations and Ash Deposition During Staged Combustion. Quarterly Technical Progress Report, October 1, 1993--December 31, 1993 written by and published by . This book was released on 1994 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thorough understanding of the fundamental processes which govern the mineral behavior is essential to the development of tools to predict and manage ash deposition. The purpose of the current project is to perform a fundamental study of mineral transformations and ash deposition during staged combustion of pulverized coal. Staging of combustion air is a strategy used to reduce NO(subscript x) emissions from coal-fired units. It is applicable to both advanced combustion systems currently under development (e.g. HITAF) and low NO(subscript x) retrofits for existing units. These low NO(subscript x) combustion strategies produce fuel rich or reducing conditions in the lower furnace. Therefore, the combustion history of the coal particles is significantly changed from that experienced under normal combustion conditions. A carefully designed experimental study is needed to examine the effects of altered combustion conditions on mineral matter release, fly ash formation, particle stickiness and deposit formation. This project uses state-of-the-art analytical equipment and a well-characterized laboratory combustor to address this need. This report describes work in the initial quarter of a fundamental, three-year study of mineral transformations and ash deposition during staged combustion.
Download or read book Investigation of Mineral Transformations and Ash Deposition During Staged Combustion, Quarterly Technical Progress Report, October 1, 1995-December 31, 1995 written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1260 pages
Book Rating : 4.:/5 (3 download)
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:
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Total Pages : 89 pages
Book Rating : 4.:/5 (685 download)
Download or read book Fundamental Study of Ash Formation and Deposition written by and published by . This book was released on 1993 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: The technical objectives of this project are: To identify the partitioning of inorganic coal constituents among vapor, submicron fume, and fly ash products generated during the combustion of pulverized coal under a variety of combustion conditions. Fuel lean and fuel rich combustion conditions will be considered. To identify and quantify the fundamental processes by which the transformations of minerals and organically-associated inorganic species occur. Emphasis will be placed on identifying any changes that occur as a result of combustion under sub-stoichiometric combustion conditions. To incorporate the effects of combustion stoichiometry into an Engineering Model for Ash Formation based upon the understanding developed in (a) and (b). When completed, this model wig predict the particle size and chemical composition distributions of ash formed during the combustion of pulverized coal under a broad range of conditions. The work discussed in this report highlights the accomplishments of the second quarter of this two year project. This includes the final selection of coals by PSI PowerServe, the results of initial in-situ XAFS combustion measurements by the University of Kentucky, a review of the status of ash formation and deposition models by MIT, modeling of iron behavior during coal combustion by the University of Arizona, preliminary work on the redistribution of minerals within char during the early stages of combustion by PSI PowerServe, and the incorporation of a char fragmentation mechanism into the ash formation model by PSI PowerServe.
Download or read book Suppression of Fine Ash Formation in Pulverized Coal Flames. Quarterly Technical Progress Report No. 5, October 1, 1993--December 31, 1993 written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Laboratory work and studies of full-scale coal-fired boilers have identified two general mechanisms for ash production. The vast majority of the ash is formed from mineral matter that coalesces as the char burns, yielding particles that are normally larger than 0.5[mu]m. Flagen and Friedlander proposed a simple model for this residual ash, called the breakup model. The second major mechanism is the generation of a submicron aerosol through a vaporization/condensation mechanism. When the ash size distribution is plotted in terms of number density, the submicron mode generally peaks at about 0.1 [mu]/m. When plotted in terms of mass, this mode is sometimes distinct from the residual ash mode, [sup 13] and sometimes merged into it. Although these particles represent a relatively small fraction of the mass, they can present a large fraction of the surface area. Thus, they are a preferred site for the condensation of the more volatile oxides later in the furnace. This leads to a layering effect in which the refractory oxides are concentrated at the particle core and the more volatile oxides reside at the surface. This also explains the enrichment of the aerosol by volatile oxides that has been noted in samples from practical furnaces. These volatile metal oxides include the majority of the toxic metal contaminants, e.g., mercury, arsenic, selenium and nickel. Risk assessment studies suggest that toxic metal emissions represent a significant portion of the health risk associated with combustion.
