Pyrolysis and gasification of coal at high temperatures

Technical Report · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5262939

Zygourakis, K

Research continued on pyrolysis and gasification of coal. Tasks include: Effects of pyrolysis conditions on macropore structure. Coals of different ranks will be pyrolyzed in a microscope hot-stage reactor using inert and reacting atmospheres. The macropore structure of the produced chars will be characterized using video microscopy and digital image processing techniques to obtain pore size distributions. Comparative studies will quantify the effect of pyrolysis conditions (heating rates, final heat treatment temperatures, particle size and inert or reacting atmosphere) on the pore structure of the devolatilized chars; gasification under strong intraparticle diffusional limitations. The devolatilized chars will be gasified in the regime of strong intraparticle diffusional limitations using O{sub 2}/N{sub 2} and O{sub 2}/H{sub 2}O/N{sub 2} mixtures. Constant temperature and programmed-temperature experiments in a TGA will be used for these studies. Additional gasification experiments performed in the hot-stage reactor will be videotaped and selected images will be analyzed to obtain quantitative data on particle shrinkage and fragmentation; and mathematical modeling and model validation. 6 figs.

• Research Organization: Rice Univ., Houston, TX (United States). Dept. of Chemical Engineering
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-87PC79930
• OSTI ID: 5262939
• Report Number(s): DOE/PC/79930-T6; ON: DE91018325
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
010409 -- Coal
Lignite
& Peat-- Pyrolysis & Carbonization-- (1987-)
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL GASIFICATION
DECOMPOSITION
DOCUMENT TYPES
GASIFICATION
KINETICS
MATHEMATICAL MODELS
MICROSCOPY
POROSITY
PROGRESS REPORT
PYROLYSIS
PYROLYSIS PRODUCTS
REACTION KINETICS
THERMOCHEMICAL PROCESSES