Pyrolysis of a subbituminous coal in a high-pressure entrained-flow reactor
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.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (USA)
- OSTI ID:
- 6426269
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010409* -- Coal
Lignite
& Peat-- Pyrolysis & Carbonization-- (1987-)
ACTIVATION ENERGY
CALORIFIC VALUE
CARBONACEOUS MATERIALS
CHARS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL
COAL GAS
COAL TAR
COMBUSTION PROPERTIES
CRACKING
DECOMPOSITION
DENSITY
DISTRIBUTION
ELECTRON MICROSCOPY
ELEMENTS
ENERGY
ENERGY SOURCES
EXTRACTION
FLUIDS
FOSSIL FUELS
FOURIER TRANSFORMATION
FUELS
FURANS
GAS CHROMATOGRAPHY
GASES
HELIUM
HETEROCYCLIC COMPOUNDS
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
KINETICS
LOSSES
MASS TRANSFER
MATERIALS
MATHEMATICAL MODELS
MEDIUM PRESSURE
MICROSCOPY
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PARTICLE SIZE
PHYSICAL PROPERTIES
POLYMERIZATION
PRESSURE DEPENDENCE
PYROLYSIS
PYROLYSIS PRODUCTS
RARE GASES
REACTION KINETICS
SCANNING ELECTRON MICROSCOPY
SEPARATION PROCESSES
SIZE
SOLVENT EXTRACTION
SPECTRA
SUBBITUMINOUS COAL
SULFUR CONTENT
SURFACE AREA
SURFACE PROPERTIES
TAR
TEMPERATURE DEPENDENCE
TETRAHYDROFURAN
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
TRANSFORMATIONS
VERY HIGH TEMPERATURE
WEIGHT
YIELDS