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Effects Of Physical And Chemical Properties Of Bright And Dull Coal Lithotypes On The Formation Of Char Particles
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Book Synopsis Effects of Physical and Chemical Properties of Bright and Dull Coal Lithotypes on the Formation of Char Particles by : Chad G. Tomforde
Download or read book Effects of Physical and Chemical Properties of Bright and Dull Coal Lithotypes on the Formation of Char Particles written by Chad G. Tomforde and published by . This book was released on 1998 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The North Dakota Quarterly written by and published by . This book was released on 1999 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Chemical and Physical Properties of Chars Derived from Inertinite-rich, High Ash Coals on Gasification Reaction Kinetics by : Gregory Nworah Okolo
Download or read book The Effects of Chemical and Physical Properties of Chars Derived from Inertinite-rich, High Ash Coals on Gasification Reaction Kinetics written by Gregory Nworah Okolo and published by . This book was released on 2010 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inertinite-rich coal -- Coal and char properties -- Char carbon forms -- Carbon crystallite analysis -- Carbon dioxide gasification -- Kinetic modelling -- Inertiniet-ryke steenkool -- Sintels koolstof vorme -- Steenkool en sintels eienskappe -- Koolstof kristal analise -- Koolstofdioksied vergassing -- Kinetiese modellering.
Book Synopsis Radiative Properties of Char, Fly-ash, and Soot Particles in Coal Flames. Quarterly Report No. 5, September 15--December 15, 1993 by :
Download or read book Radiative Properties of Char, Fly-ash, and Soot Particles in Coal Flames. Quarterly Report No. 5, September 15--December 15, 1993 written by and published by . This book was released on 1993 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The soot formation model formulated in this study is a simple one and considered mainly to determine the order-of-magnitude variations of soot volume formation distribution in a flame. To this extent the model is considered sufficient. First of all, the soot formation is to be coupled closely with the chemical kinetics models. Recent studies suggest that acetylene formed during the combustion of heavy hydrocarbons play a key role in the formation of PAH molecules and in soot inception. Lindstedt and his coworkers (Fairweather et al., 1992; Leung et al., 1992) used a flamelet model and considered global reactions for soot formation. They derived instantaneous relationships between mixture fraction, density, temperature, and gaseous composition of a combusting mixture. Leung et al. (1991) suggested a four-step soot formation/destruction mechanism, and they connected it to the presence of intermediate pyrolysis products, primarily to acetylene. Two separate competing mechanisms were thought to be responsible from soot mass formation: the formation of incipient particles and the particle surface growth due to adsorption of acetylene molecules.
Book Synopsis Konstitutionen der Schwestern von der göttlichen Vorsehung Mainz by :
Download or read book Konstitutionen der Schwestern von der göttlichen Vorsehung Mainz written by and published by . This book was released on 1936 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ignition of Coal and Char Particles by : Dosite Samuel Perkins (II.)
Download or read book Ignition of Coal and Char Particles written by Dosite Samuel Perkins (II.) and published by . This book was released on 2002 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Catalytic Mineral Matter on CO/CO2 Temperature and Burning Time for Char Combustion. Quarterly Progress Report No. 15 (Final Report), October 1993--December 1993 by :
Download or read book Effects of Catalytic Mineral Matter on CO/CO2 Temperature and Burning Time for Char Combustion. Quarterly Progress Report No. 15 (Final Report), October 1993--December 1993 written by and published by . This book was released on 1993 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: The high temperature oxidation of char is of interest in a number of applications in which coal must be burned in confined spaces including the conversion of oil-fired boilers to coal using coal-water slurries, the development of a new generation of pulverized-coal-fired cyclone burners, the injection of coal into the tuyeres of blast furnaces, the use of coal as a fuel in direct-fired gas turbines and in large-bore low-speed diesels, and entrained flow gasifiers. There is a need to understand the temperature history of char particles in conventional pulverized-coal-fired boilers to better explain the processes governing the formation of pollutants and the transformation of mineral matter. The temperature of char particle burning is the product of a strongly coupled balance between particle physical properties, heat and mass transfer, surface reaction, and CO/CO2 ratio. Particle temperature has major effects not only on the burning rate but also on ash properties and mineral matter vaporization. Measurements of the temperature of individual burning char particles have clearly demonstrated large particle-to-particle temperature variations which depend strongly on particle size and on particle composition. This report consists of two major parts. In the first part, experimental measurements of CO/CO2 ratio for a single spherocarb particle is presented along with a kinetic model which allows estimation of CO/CO2 generated at a carbon surface for temperatures higher than those reported in the experimental work. In the second part, modeling of a temperature profile during a char combustion is reported, and also progress in modeling the complex sets of coupled phenomena involving full gas phase reaction kinetics, heat transfer, and mass transfer is summarized. In the appendix progress on construction and testing of an improved electrodynamic balance is presented.
Download or read book Coal-char written by David Harold Dietz and published by . This book was released on 1984 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Pressure on the Properties of Coal Char Under Gasification Conditions at High Initial Heating Rates by : Randy Clark Shurtz
Download or read book Effects of Pressure on the Properties of Coal Char Under Gasification Conditions at High Initial Heating Rates written by Randy Clark Shurtz and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of elevated pressure and high heating rates on coal pyrolysis and gasification were investigated. A high-pressure flat-flame burner (HPFFB) was designed and built to conduct these studies. The HPFFB was designed to provide an environment with laminar, dispersed entrained flow, with particle heating rates of ~10^5 K/s, pressures of up to 15 atm, and gas temperatures of up to 2000 K. Residence times were varied from 30 to 700 ms in this study.
Book Synopsis Effects of Preparation Method and Parent Coal Rank on Coal Char Reactivity by : William D. Hyde (Chemical engineer.)
Download or read book Effects of Preparation Method and Parent Coal Rank on Coal Char Reactivity written by William D. Hyde (Chemical engineer.) and published by . This book was released on 1990 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Catalytic Mineral Matter on CO/CO2 Temperature and Burning Time for Char Combustion. Quarterly Progress Report No. 11, April--June 1992 by :
Download or read book Effects of Catalytic Mineral Matter on CO/CO2 Temperature and Burning Time for Char Combustion. Quarterly Progress Report No. 11, April--June 1992 written by and published by . This book was released on 1992 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The high temperature oxidation of char is of interest in a number of applications in which coal must be burned in confined spaces. These include: the conversion of oil-fired boilers to coal using coal-water slurries, the development of a new generation of pulverized-coal-fired cyclone burners, the injection of coal into the tuyeres of blast furnaces, the use of coal as a fuel in direct-fired gas turbines in large-bore low-speed diesels, and entrained flow gasifiers. In addition, there is a need to better understand the temperature history of char particles in conventional pulverized-coal-fired boilers in order to better understand the processes governing the formation of pollutants and the transformation of mineral matter. The temperature of a char particle burning in an oxygen containing atmosphere is the product of a strongly coupled balance between particle size and physical properties, heat transfer from the particle, surface reactivity, CO/CO2 ratio and gas phase diffusion in the surrounding boundary layer and within the particle. In addition to its effects on burning rate, particle temperature has major effects on ash proper-ties and mineral matter vaporization. Measurements of the temperature of individual burning char particles have become available in recent years and have clearly demonstrated large particle to particle temperature variations which depend strongly on particle size and on panicle composition. These studies, done with pulverized coal, do not allow direct determination of the CO/CO2 ratio produced at the char surface or the catalytic effects of mineral matter in the individual char particles and it has generally been assumed that CO is the only product of the carbon-oxygen reaction and that CO2 is formed by subsequent gas phase reaction More recent work, however, has pointed out the need to take CO2 Production into consideration in order to account for observed particle temperatures.
Book Synopsis The Physical and Chemical Properties of the Structural Constitutents of Coal (macerals) by : Carl Kroger
Download or read book The Physical and Chemical Properties of the Structural Constitutents of Coal (macerals) written by Carl Kroger and published by . This book was released on 1957 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radiative Properties of Char, Fly-ash, and Soot Particles in Coal Flames. First Annual Report by :
Download or read book Radiative Properties of Char, Fly-ash, and Soot Particles in Coal Flames. First Annual Report written by and published by . This book was released on 1993 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers the first twelve months of the project {open_quotes}Radiative Properties of Char, Fly-Ash, and Soot Particles in Coal Flames{close_quotes}, that is from September 15, 1992 to September 15, 1993. The objectives of this project can be summarized as follows: (1) obtain the effective radiative properties of pulverized coal/char and soot particles, and (2) determine the concentration distribution of char, fly-ash, and soot particles in coal laden flames as a function of different flame conditions. Research accomplishments in the following areas are described: effective properties of coal and char particles; multilayer sphere model; soot formation model; and soot radiative properties. The experiments are described and plans for future work are outlined.
Book Synopsis Some Physical and Chemical Properties of Coal Surfaces by : George Anthony Brady
Download or read book Some Physical and Chemical Properties of Coal Surfaces written by George Anthony Brady and published by . This book was released on 1938 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Pressure on the Properties of Coal Char Under Gasification Conditions at High Initial Heating Rates by : Randy Clark Shurtz
Download or read book Effects of Pressure on the Properties of Coal Char Under Gasification Conditions at High Initial Heating Rates written by Randy Clark Shurtz and published by . This book was released on 2011 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of elevated pressure and high heating rates on coal pyrolysis and gasification were investigated. A high-pressure flat-flame burner (HPFFB) was designed and built to conduct these studies. The HPFFB was designed to provide an environment with laminar, dispersed entrained flow, with particle heating rates of ~10^5 K/s, pressures of up to 15 atm, and gas temperatures of up to 2000 K. Residence times were varied from 30 to 700 ms in this study.
Book Synopsis Combustion Properties of Coal-char Blends by :
Download or read book Combustion Properties of Coal-char Blends written by and published by . This book was released on 1993 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests under pulverized coal combustion conditions suggest that NO(subscript x) formed during release of volatile matter far exceed NO(subscript x) formed during combustion of the resulting char. This is attributed to char/NO(subscript x) interactions by both direct reduction of NO, by carbon and char-catalyzed reduction by CO. This implies combustion of char not only produces substantially lower No(subscript x) but the presence of char in the flame during initial stages of combustion may potentially provide catalytic activity for reduction of NO(subscript x) produced from volatile nitrogen. The goal of the project is to determine if the concept of NO(subscript x) reduction by char/NO(subscript x) interactions, while maintaining a high combustion efficiency by co-firing coal with char, is a technically feasible way to reduce NO(subscript x) emissions. Char samples will be prepared in a continuous rotary tube kiln under mild gasification conditions. Combustion testing will be conducted with the coal and coal-char blends in a combustor located at BYU. The effect of coal/char ratio, formation characteristics, ignition characteristics, flame stability, and combustion efficiency will be determined. Physical and chemical properties of the fuels will be measured to help explain combustion and emission characteristics of fuels.
Book Synopsis Effective Optical and Radiative Properties of Pulverized Coal/char Particles by : Sivakumar Manickavasagam
Download or read book Effective Optical and Radiative Properties of Pulverized Coal/char Particles written by Sivakumar Manickavasagam and published by . This book was released on 1993 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
