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Ash Formation Under Pressurized Pulverized Coal Combustion Conditions
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Book Synopsis Ash Formation Under Pressurized Pulverized Coal Combustion Conditions by : Aura Cecilia Davila Latorre
Download or read book Ash Formation Under Pressurized Pulverized Coal Combustion Conditions written by Aura Cecilia Davila Latorre and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Coal combustion is a source of inorganic particulate matter (ash), which can deposit in boilers and also be emitted into the atmosphere becoming part of ambient fine particulate matter (PM 2.5). In order to decrease coal combustion emissions per unit of power produced, higher efficiency systems have been proposed, including systems operating at elevated pressures. These new operating conditions will affect pollutant formation mechanisms, particularly those associated with the conversion of mineral matter to ash. Ash particle formation mechanisms are particularly sensitive to changes in pressure as they are related to the structure of coal char particles at early stages of combustion. To assess the importance of pressure on ash particle formation, pyrolyzed chars and ash particles from pressurized pulverized combustion of two bituminous and one subbituminous U.S. coals at operating pressures up to 30 atm were studied. Pressure changes the distribution of char particle types, changing the spatial distribution of the minerals during the combustion process and therefore affecting particle formation mechanisms. Chars were examined by Scanning Electron Microscopy (SEM) and classified into two different types (cenospheric and solid) depending on porosity and wall thickness. A correlation for estimating the amount of these cenospheric char particles was then proposed for bituminous coals based on the operating conditions and coal maceral analysis. The ash particle size distribution of the coals combusted at different operating pressures was measured using Computer Controlled Scanning Electron Microscopy (CCSEM). The results of the char characterization and ash particle size distribution measurements were then incorporated into an ash particle formation algorithm that was proposed and implemented. The model predicts ash particle size and composition distributions at elevated pressures under conditions of complete char burnout. Ash predictions were calculated by first developing char structure distribution functions based on coal characteristics. To obtain an ash particle size distribution, carbon is then allowed to react away while following coalescence, fragmentation and other transformation processes as combustion proceeds. Particle size distributions calculated with this model showed qualitative agreement with the trends identified in the experimental portion of this research.
Book Synopsis Ash Formation Under Pressurized Coal Combustion Conditions by : Aura Cecilia Dávila Latorre
Download or read book Ash Formation Under Pressurized Coal Combustion Conditions written by Aura Cecilia Dávila Latorre and published by . This book was released on 2005 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis "Ash Formation During Pulverised Coal Combustion and Gasification at Pressure" by : Hongwei Wu (PhD.)
Download or read book "Ash Formation During Pulverised Coal Combustion and Gasification at Pressure" written by Hongwei Wu (PhD.) and published by . This book was released on 2000 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ash Formation During Pulverised Coal Combustion and Gasification at Pressure by : Hongwei Wu
Download or read book Ash Formation During Pulverised Coal Combustion and Gasification at Pressure written by Hongwei Wu and published by . This book was released on 2000 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ash Vaporization Under Simulated Pulverized Coal Combustion Conditions by : Richard John Quann
Download or read book Ash Vaporization Under Simulated Pulverized Coal Combustion Conditions written by Richard John Quann and published by . This book was released on 1982 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Behavior of Ash in Pulverized Coal Under Simulated Combustion Conditions by : Ashok Kumar Sanwarmal Padia
Download or read book The Behavior of Ash in Pulverized Coal Under Simulated Combustion Conditions written by Ashok Kumar Sanwarmal Padia and published by . This book was released on 1976 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanisms of Ash Particle Formation and Growth During Pulverized Coal Combustion by : Joseph John Helble
Download or read book Mechanisms of Ash Particle Formation and Growth During Pulverized Coal Combustion written by Joseph John Helble and published by . This book was released on 1987 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Oxy-fuel Combustion by : Chuguang Zheng
Download or read book Oxy-fuel Combustion written by Chuguang Zheng and published by Academic Press. This book was released on 2017-09-14 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oxy-fuel Combustion: Fundamentals, Theory and Practice provides a comprehensive review of various aspects of oxy-fuel combustion technology, including its concept, fundamental theory, pilot practice, large-scale feasibility studies and related practical issues, such as the commissioning and operation of an oxy-fuel combustion plant. Oxy-fuel combustion, as the most practical large-scale carbon capture power generation technology, has attracted significant attention in the past two decades. As significant progress has been achieved in worldwide demonstration and the oxy-combustion concept confirmed by Schwartze Pump, CUIDEN, Callide, Ponferrada and Yingcheng projects in the past five years, this book provides a timely addition for discussion and study. Covers oxy-fuel combustion technology Includes concepts, fundamentals, pilots and large-scale feasibility studies Considers related practical issues, such as the commissioning and operation of an oxy-fuel combustion plant Focuses on theories and methods closely related to engineering practice
Book Synopsis The Structure and Reaction Processes of Coal by : K.Lee Smith
Download or read book The Structure and Reaction Processes of Coal written by K.Lee Smith and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Founded on the work of the renowned Advanced Combustion Engineering Research Center, the authors document and integrate current knowledge of the organic and inorganic structure of coal and its reaction processes. With the urgent need for cleaner, more efficient use of this worldwide fuel, their work will set a clear course for future research.
Book Synopsis Suppression of Fine Ash Formation in Pulverized Coal Flames. Quarterly Technical Progress Report No. 6, January 1, 1994--March 31, 1994 by :
Download or read book Suppression of Fine Ash Formation in Pulverized Coal Flames. Quarterly Technical Progress Report No. 6, January 1, 1994--March 31, 1994 written by and published by . This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the present quarter the model was coded and tested on the Illinois coal. Some features of the process need discussion. After devolatilization, the char particle heats towards its steady-state combustion temperature. At approximately 1200--1300 K, the particle quickly goes from a temperature where the equilibrium sodium vapor pressure is negligible to a temperature where it is at one atmosphere. This shows that the sodium vaporization occurs under non-isothermal conditions, although the rapid rate of sodium diffusion relative to particle heating suggests that the quasi steady-state formulation for the sodium vaporization portion of the problem is appropriate. It also illustrates the two-stage release pattern for the sodium: (1) an early rapid release of organically-bound sodium, and (2) a more delayed release of acid-washable sodium, and sodium that was complexed into clay chemicals during the organic sodium vaporization. The conditions reported for the present calculations are as follows: Coal: 8.7% ash, 12% H2O, 33.5% volatile matter. Elemental sodium represent 0.82% of the ash. For purposes of calculation, the char particle is presumed to consist of the fixed carbon from the proximate analysis, along with the ash. This establishes the mass fraction of sodium and other minerals in the char at the start of char combustion. For the baseline condition, the char particle was assumed to be 50% covered by attached excluded mineral, and the included mineral matter was assumed to be divided into monodisperse 0.5 [mu]m particles that are evenly dispersed throughout the char. The diameter of the char particle was 25 [mu]m.
Book Synopsis Fundamental Studies of Mineral Matter Transformation During Pulverized Coal Combustion by : Shin-Gyoo Kang
Download or read book Fundamental Studies of Mineral Matter Transformation During Pulverized Coal Combustion written by Shin-Gyoo Kang and published by . This book was released on 1991 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Suppression of Fine Ash Formation in Pulverized Coal Flames. Final Technical Report, September 30, 1992--January 31, 1996 by :
Download or read book Suppression of Fine Ash Formation in Pulverized Coal Flames. Final Technical Report, September 30, 1992--January 31, 1996 written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Coal ash, and particularly fine fly ash, remain one of the principal practical and environmental problems in coal-based power generation. In particular, submicron aerosols are identified with direct inhalation risk. Submicron ash is thought to arise from mineral vaporization during char combustion, followed by nucleation, condensation and coagulation to yield an aerosol. While aerosols are predominantly made out of volatile alkali minerals, they also can include refractory oxides that are chemically reduced to more volatile forms within the char particle and vaporized. Most of the ash of size greater than 1[mu]m is generated by agglomeration of mineral as the char particle bums out. These two principal mechanisms are thought to account for most of the ash generated in coal combustion. Previous research has shown that various forms of coal treatment can influence the yields of fine ash from combustion. The research reported here investigates various forms of treatment, including physical coal cleaning, aerodynamic sizing, degree of grinding, and combinations of these on both aerosol yields and on yields of fine residual ash (1-4[mu]m). The work also includes results from the combustion of artificial chars that include individual mineral elements. This research shows that these various forms of coal treatment can significantly change ash characteristics. While none of the treatments affected the bulk of the residual ash size distribution significantly, the yield of the ash aerosol mode (d
Book Synopsis Submicron Ash Formation and Interaction with Sulfur Oxides During Pulverized Coal Combustion by : Karl Allen Graham
Download or read book Submicron Ash Formation and Interaction with Sulfur Oxides During Pulverized Coal Combustion written by Karl Allen Graham and published by . This book was released on 1991 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Impact Of Ash Deposition On Coal Fired Plants by : Jim Williamson
Download or read book The Impact Of Ash Deposition On Coal Fired Plants written by Jim Williamson and published by Taylor & Francis. This book was released on 2022-10-12 with total page 1103 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coal provides almost 40% of the world's electricity, and despite the understandable concern with respect to the environmental impact associated with coal use, forecasts from the International Energy Agency predict, that worldwide coal use will increase by up to 2% per annum until the year 2OlO. Faced with this increase, it is clearly important that the most efficient and environmentally acceptable clean coal technologies are available. This book is comprised of the proceedings of the Engineering Foundation Conference held in June 1993 in England. The objective of the conference was to present ideas on methods of predicting and reducing the effects of ash deposition in coal conversion systems, highlighting the problems experienced in industry, considering both utilities and industrial plants, and providing a view of the technology of coal ash deposition and its impact. Better techniques are needed to reduce the impact of ash deposition in coal fired plants, and these proceedings should form a reference document for anyone either experiencing slagging or actively engaged in trying to understand or eliminate the phenomenon.
Book Synopsis A Pilot-scale Study of the Formation of Ash During Pulverized Low-rank Coal Combustion by : John P. Hurley
Download or read book A Pilot-scale Study of the Formation of Ash During Pulverized Low-rank Coal Combustion written by John P. Hurley and published by . This book was released on 1990 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Suppression of Fine Ash Formation in Pulverized Coal Flames. Quarterly Technical Progress Report No. 10, January 1, 1995--March 31, 1995 by :
Download or read book Suppression of Fine Ash Formation in Pulverized Coal Flames. Quarterly Technical Progress Report No. 10, January 1, 1995--March 31, 1995 written by and published by . This book was released on 1995 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The production of ash particles from coal combustion limits it's use as a fuel. On mechanism by which small ash particles are formed is the generation of submicron aerosols through a vaporization/condensation mechanism. Previous work has shown that coal cleaning can lead to increased emissions of aerosols. This research will investigate the means or aerosol formation in coals and the effects that various methods of coal cleaning have on aerosol production, and whether or not cleaning can be performed in a manner that will not lend itself to aerosol formation.
Book Synopsis Particulate Formation from Pulverized Coal Under Oxy-fuel Combustion Conditions by : Yunlu Jia
Download or read book Particulate Formation from Pulverized Coal Under Oxy-fuel Combustion Conditions written by Yunlu Jia and published by . This book was released on 2015 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:
