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Title: Pyrolysis of a subbituminous coal in a high-pressure entrained-flow reactor

Abstract

In this study pyrolysis experiments were performed on pulverized samples (200 x 270 mesh) of Montana Rosebud subbituminous coal at a temperature of 1189 K, applied nitrogen pressures of 100 to 900 psig and residence times between 0.1 to 1.7 seconds. The solid products of pyrolysis were extracted with tetrahydrofuran with the extract representing the pyrolysis tars and the residue representing the char. The gaseous pyrolysis products were analyzed qualitatively and quantitatively by an on-line gas chromatograph. An infrared gas analyzer was used to continuously monitor the CO concentration in the outlet gas stream. This was used to determine when the reactor had reached steady state operation. Proximate analyses data were then used to calculate weight loss due to pyrolysis by using the proximate ash as a tracer. Ultimate analyses were performed also on the raw coal, chars. The effect of pressure and residence time on the product yield and distribution was determined. The data indicated that both the applied pressure and residence time affected the pyrolysis product yield and composition. The chars generated by pyrolysis following rapid heating were characterized further by the following physical and chemical analyses: particle size distribution, Scanning Electron Microscopy, He density, N{sub 2} surfacemore » area, total and forms of sulfur, higher heating value, Fourier Transform Infrared Spectroscopy (FTIR) and reactivity. The tar samples were also characterized by total sulfur analysis and FTIR. The influence of pressure and residence time on char and tar properties was shown to be substantial. The data suggested that, at higher residence times, secondary cracking and repolymerization reactions occurred, and that mass transfer played a major role in the product yield and distribution.« less

Authors:
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (USA)
OSTI Identifier:
6426269
Alternate Identifier(s):
OSTI ID: 6426269
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; SUBBITUMINOUS COAL; PYROLYSIS; ACTIVATION ENERGY; CALORIFIC VALUE; CHARS; CHEMICAL ANALYSIS; CHEMICAL COMPOSITION; CHEMICAL REACTION KINETICS; CHEMICAL REACTION YIELD; COAL GAS; COAL TAR; CRACKING; DENSITY; DISTRIBUTION; FOURIER TRANSFORMATION; GAS CHROMATOGRAPHY; HELIUM; INFRARED SPECTRA; LOSSES; MASS TRANSFER; MATHEMATICAL MODELS; MEDIUM PRESSURE; NITROGEN; PARTICLE SIZE; POLYMERIZATION; PRESSURE DEPENDENCE; SCANNING ELECTRON MICROSCOPY; SOLVENT EXTRACTION; SULFUR CONTENT; SURFACE AREA; TEMPERATURE DEPENDENCE; TETRAHYDROFURAN; TIME DEPENDENCE; VERY HIGH TEMPERATURE; WEIGHT; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; CHROMATOGRAPHY; COAL; COMBUSTION PROPERTIES; DECOMPOSITION; ELECTRON MICROSCOPY; ELEMENTS; ENERGY; ENERGY SOURCES; EXTRACTION; FLUIDS; FOSSIL FUELS; FUELS; FURANS; GASES; HETEROCYCLIC COMPOUNDS; INTEGRAL TRANSFORMATIONS; KINETICS; MATERIALS; MICROSCOPY; NONMETALS; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; OTHER ORGANIC COMPOUNDS; PHYSICAL PROPERTIES; PYROLYSIS PRODUCTS; RARE GASES; REACTION KINETICS; SEPARATION PROCESSES; SIZE; SPECTRA; SURFACE PROPERTIES; TAR; THERMOCHEMICAL PROCESSES; TRANSFORMATIONS; YIELDS 010409* -- Coal, Lignite, & Peat-- Pyrolysis & Carbonization-- (1987-)

Citation Formats

Fatemi-Badi, S.M. Pyrolysis of a subbituminous coal in a high-pressure entrained-flow reactor. United States: N. p., 1989. Web.
Fatemi-Badi, S.M. Pyrolysis of a subbituminous coal in a high-pressure entrained-flow reactor. United States.
Fatemi-Badi, S.M. Sun . "Pyrolysis of a subbituminous coal in a high-pressure entrained-flow reactor". United States.
@article{osti_6426269,
title = {Pyrolysis of a subbituminous coal in a high-pressure entrained-flow reactor},
author = {Fatemi-Badi, S.M.},
abstractNote = {In this study pyrolysis experiments were performed on pulverized samples (200 x 270 mesh) of Montana Rosebud subbituminous coal at a temperature of 1189 K, applied nitrogen pressures of 100 to 900 psig and residence times between 0.1 to 1.7 seconds. The solid products of pyrolysis were extracted with tetrahydrofuran with the extract representing the pyrolysis tars and the residue representing the char. The gaseous pyrolysis products were analyzed qualitatively and quantitatively by an on-line gas chromatograph. An infrared gas analyzer was used to continuously monitor the CO concentration in the outlet gas stream. This was used to determine when the reactor had reached steady state operation. Proximate analyses data were then used to calculate weight loss due to pyrolysis by using the proximate ash as a tracer. Ultimate analyses were performed also on the raw coal, chars. The effect of pressure and residence time on the product yield and distribution was determined. The data indicated that both the applied pressure and residence time affected the pyrolysis product yield and composition. The chars generated by pyrolysis following rapid heating were characterized further by the following physical and chemical analyses: particle size distribution, Scanning Electron Microscopy, He density, N{sub 2} surface area, total and forms of sulfur, higher heating value, Fourier Transform Infrared Spectroscopy (FTIR) and reactivity. The tar samples were also characterized by total sulfur analysis and FTIR. The influence of pressure and residence time on char and tar properties was shown to be substantial. The data suggested that, at higher residence times, secondary cracking and repolymerization reactions occurred, and that mass transfer played a major role in the product yield and distribution.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

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