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2 edition of Devolatilization kinetics and elemental release in the pyrolysis of pulverized coal found in the catalog.

Devolatilization kinetics and elemental release in the pyrolysis of pulverized coal

V. H Agreda

Devolatilization kinetics and elemental release in the pyrolysis of pulverized coal

by V. H Agreda

  • 186 Want to read
  • 22 Currently reading

Published by U.S. Environmental Protection Agency, Industrial Environmental Research Laboratory, National Technical Information Service [distributor in Research Triangle Park, NC, Springfield, Va .
Written in English

    Subjects:
  • Coal -- Combustion -- Mathematical models,
  • Coal gasification -- Mathematical models

  • Edition Notes

    Statementby V.H. Agreda, R.M. Felder, and J.K. Ferrell ; prepared for U.S. Environmental Protection Agency, Office of Research and Development
    SeriesInteragency energy/environment R&D program report -- EPA-600/7-79-241, Research reporting series -- EPA-600/7-79-241
    ContributionsFelder, R. M, Ferrell, J. K., Industrial Environmental Research Laboratory (Research Triangle Park, N.C.), North Carolina State University. Dept. of Chemical Engineering
    The Physical Object
    Paginationxii, 292 p. :
    Number of Pages292
    ID Numbers
    Open LibraryOL14888628M

    Detailed kinetic model of coal pyrolysis The pyrolysis model proposed by Sommariva et al. [3] characterizes the initial coal matrix as a copolymeric structure described by three lumped and reference components. Any individual coal is considered as a simple linear combination of. A thermogravimetric analyzer was employed to investigate the thermal behavior and extract the kinetic parameters of Canadian lignite coal. The pyrolysis experiments were conducted in temperatures ranging from K to K under inert atmosphere utilizing six different heating rates of 1, 6, 9, 12, 15, and 18 K min >&#x;1, by:

      The thermodynamic properties of coal under conditions of rapid heating have been determined using a combination of UTRC facilities including a proprietary rapid heating rate differential thermal analyzer (RHR-DTA), a microbomb calorimeter (MBC), an entrained flow reactor (EFR), an elemental analyzer (EA), and a FT-IR. The total heat of devolatilization, was measured for a HVA bituminous coal Cited by: 1. A thermogravimetric and kinetic study on devolatilization of woody biomass Background and objective Biomass has a large potential to act as a major and sustainable substitution solution for fossil fuels in the future. Woody biomass is one of most abundant biomass resources, which has been used directly.

    Representative Biomass and Coal Properties Biomass 1 Biomass 2 Coal 1 Coal 2 Tar Sands Name Wood Red Corn Cob Grundy, IL. No 4 Rosebud, MT Athabasca Classification HvBb sub B Bitumen Proximate Analysis, wt% Dry Moisture 16 Volatile Matter ca. 80 Fixed Carbon -- Ash 4 File Size: 1MB. Pyrolysis: A sustainable way from Waste to Energy. Pyrolysis is a thermochemical decomposition of organic material at temperatures between °C and °C without the presence of Char contains elemental carbon along with hydrogen and various inorganic species.


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Devolatilization kinetics and elemental release in the pyrolysis of pulverized coal by V. H Agreda Download PDF EPUB FB2

EPA/ November Devolatilization Kinetics and Elemental Release in the Pyrolysis of Pulverized Coal by V.H. Agreda, R.M. Felder, and J.K. Ferrell North Carolina State University Department of Chemical Engineering Raleigh, North Carolina Grant No. R Program Element No.

EHEA EPA Project Officer: N. Dean Smith Industrial Environmental. Devolatilization kinetics and elemental release in the pyrolysis of pulverized coal Author: V H Agreda ; R M Felder ; J K Ferrell ; Industrial Environmental Research Laboratory (Research Triangle Park, N.C.) ; North Carolina State University.

Kinetics of coking coal pyrolysis. Kinetics studies on coal pyrolysis were extensively performed by Solomon and his group based on the evolution of gas products and tar yield. However, the production of gas products and tar is a more complicated process than the evolution of functional groups in coal Cited by: 8.

The model is found to adequately reproduce the experimental trends regarding both volatile release and char oxidation rates for the range of particle sizes and combustion conditions explored. The experimental and numerical procedures, similar to those recently proposed for the combustion of pulverized coal [J.

Ballester, S. Jiménez, by: Unfortunately, there is still controversy concerning the rate of coal pyrolysis. For example, at particle temperatures estimated to be °C, rates reported in the literature (derived using a single first-order process to define weight loss or tar evolution) vary from less than 1 s -1 1–4 to more than s -1 5–11 with values in between Cited by: 4.

During the pyrolysis process, devolatilization can directly cause coal mass loss and accelerate ignition and combustion of the coal particles by increasing the temperature of the gas phase or coal particles. The pyrolysis produces remarkable changes in chemical structure, surface morphology and porosity of the coal particle, which have an important effect on the char by: The extents of total devolatilization, elemental release, and individual product species formation were correlated with the pyrolysis temperature, the heating rate, and the rank of the feed coal.

This report describes the experimental sys- tems used, gives the results obtained, and discusses the implications with respect to coal conversion.

A review on devolatilization of coal in fluidized bed Ramesh C. Borah 1,2,y, kinetics of coal devolatilization, and the devolatiliza-tion of large particles. This article explains the present Main reactions that occur during coal pyrolysis as per the mechanism of devolatilization proposed by van Heek and Hodek [5].

The change of the internal structure of a char during pyrolysis determines the mass transport of the volatile matter. During devolatilization, the pore openings of a softening coal will be blocked at the onset of the plastic stage due to the high fluidity contributed by the by: Most of the energy requirements in South Africa are met by conversion of coal.

Kinetics of these coal conversion reactions are necessary for these processes to be run efficiently. In this work, the kinetics of pyrolysis and combustion of a South African coal have been studied.

Coal pyrolysis in a rotary kiln: Part I. Model of the pyrolysis of a single grain The kinetics of pyrolysis were determined by both grain successively undergoes drying, then devolatilization (i.e. evolution of volatile species). The aim of the grain model is Cited by: Prompted by the need of non-petroleum-based fuels, coal research has reemerged to center stage after a lengthy dormant period.

Pyrolysis research, in particular, has gained considerable momentum because of its close connection to combustion, hydropyrolysis and liquefaction. Spectroscopic and other instrumental techniques are currently producing prodigious information about coal structure and.

Devolatilization of biomasses is a complex process in which several chemical reactions take place in both the gas and the condensed phase alongside the mass and thermal resistances involved in the.

The thermal decomposition of coal by slow heating rate is generally used to investigate carbonization of bituminous coal for coke making. It means that the thermal decomposition of coal under non-oxidizing conditions produces a residue (coke), which consists of carbon and mineral matter.

During this process the coal passes through several Size: KB. The effect of the devolatilization model on the coal particle behavior is investigated in detail by performing numerical simulations of a simple pulverized coal jet flame formed by a small jet.

The first step is kinetic study of the drying and pyrolysis of lignite particles in the range – ° C, which is characteristic of coal gasification in an autothermal reactor with an inverse thermal wave.

Analysis of the experimental data yields a linear kinetic equation for the mass loss of the coal particles in thermal : I. Mikhalev, S. Islamov. The overall reaction kinetics for the devolatilization of large coal particles Raymond C.

Eversona*, Burgert B. Hattingha,b, Hein W.J.P. Neomagusa,b, John R. Bunta,c, Daniel van Niekerkc aResearch focus area for Chemical Resource Beneficiation, North-West University, Potchefstroom Campus, Private Bag X, PotchefstroomSouth Africa.

bEnergy Systems, School of Chemical and Minerals. The kinetic analysis of pulverized coal devolatilization under an inert gaseous atmosphere has thus far been carried out under various thermal analytical methods at laboratory scale, by measuring.

The pyrolysis mechanism of Zhundong sub-bituminous coal (ZD) was investigated by tube furnace, gas chromatography and GC/MS. Coal samples were pyrolyzed in a tube furnace at any of six.

transport gasifier on co-fed coal/biomass • Project Goal: Provide fundamental co-pyrolysis and co-gasification kinetic data for C3M platform – Determine root cause of nonlinear coal/biomass interactions, if present • C3M’s co-feed data needs: – Devolatilization kinetics and product distributions – Gasification kinetics under CO 2, H.

The pyrolysis of the nitrogen content of coal was studied by rapidly heating dispersed pulverized particles of a lignite and a bituminous coal to temperatures of and K. Nitrogen Author: Hisashi Kobayashi.Devolatilization of a lignite and a bituminous coal was studied at high temperatures under rapid heating conditions.

Devolatilization rates were measured in a flow furnace designed to yield heating rates of 10 4 –2×10 5 K/s, temperatures of – K time resolution down to a few milliseconds product quenching rates of 10 6 K/s and good particle collection by: ducts as well as for the functional groups of the coal mole-cule.

Paths of the pyrolysis reactions on the basis of coal’s model as proposed by Jüntgen are shown in Fig. 5. Structural changes of the coal organic mass during pyrolysis To better understand the pyrolysis behaviour of coal, it is desirable to reduce its complexity.

One of the Cited by: