Effects of pyrolysis conditions on the macropore structure of coal chars

Conference · Fri Jan 01 04:00:00 EST 1988 · Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States)

OSTI ID:5870812

Zygourakis, K

The operating conditions influencing most strongly the pyrolysis process are the heating rate, the particle size and the pressure. Existing literature data offer little quantitative information on the effect of operating conditions on macropore structures, since the majority of past studies have concentrated on studying the kinetics of pyrolysis reactions and the distributions of the obtained products. Previous studies, however, indicate that the kinetic and transport processes occurring during pyrolysis (such as the rate of volatile release, the diffusion of volatiles into the bubbles, the transport of volatiles to the particle exterior etc.) will be governed by the time-temperature history of the coal particles. Hence, the pyrolysis heating rate is expected to have the strongest effect on the macropore structure of the chars. This paper discusses the effects of pyrolysis heating rate and particle size on the macropore structure of chars and described the modeling of char gasification.

• Research Organization: Rice Univ., Houston, TX (USA)
• DOE Contract Number: FG22-87PC79930
• OSTI ID: 5870812
• Report Number(s): CONF-8809228-
• Conference Information: Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Journal Volume: 33:4
• 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
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
CORRELATIONS
CRYSTAL STRUCTURE
DECOMPOSITION
DENSITY
DEVOLATILIZATION
DIFFUSION
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
HEATING RATE
MATERIALS
MATHEMATICAL MODELS
MICROSTRUCTURE
PARTICLE SIZE
PHYSICAL PROPERTIES
POROSITY
PRESSURE DEPENDENCE
PYROLYSIS
PYROLYSIS PRODUCTS
SHAPE
SIZE
SURFACE AREA
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE