Stereological analysis of the macropore structure of chars produced under various pyrolysis conditions and the influence of macropore structure on char gasification rates in the presence of strong diffusional limitations

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6988180

Glass, M W

The effects of pyrolysis heating rates, particle size and ash upon the macropore structure of coal-derived chars were investigated for an Illinois No. 6 and a lignite coal. A new direct method was used to characterize the macropore structure of the chars. Polished cross-sections of char particles were analyzed with an integrated video microscopy/digital image processing system. Pore size analysis combined a stereological model and digital image processing techniques to overcome the limitation of indirect methods. Obtained results were used to investigate the effects of the macropore structure on global gasification rates under conditions of strong intraparticle diffusional limitations. Simulations employed a two-dimensional discrete model and image processing techniques to treat the reaction of the complex pore structures observed.

• Research Organization: Rice Univ., Houston, TX (USA)
• OSTI ID: 6988180
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
010600 -- Coal
Lignite
& Peat-- Properties & Composition
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
CRYSTAL STRUCTURE
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
LIGNITE
MATERIALS
MICROSTRUCTURE
PARTICLE SIZE
POROSITY
PYROLYSIS
SIZE
THERMOCHEMICAL PROCESSES