Pyrolysis and gasification of coal at high temperatures

Technical Report · Fri Jan 01 04:00:00 EST 1988

DOI:https://doi.org/10.2172/5252808· OSTI ID:5252808

Zygourakis, K

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. 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}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. Discrete mathematical models will be developed and validated using the experimental gasification data.

• 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: 5252808
• Report Number(s): DOE/PC/79930-T9; ON: DE92013608
• 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-)
ATMOSPHERES
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTIONS
COAL
COAL RANK
CONTROLLED ATMOSPHERES
CRYSTAL STRUCTURE
DECOMPOSITION
DEVOLATILIZATION
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
HEAT TREATMENTS
HEATING RATE
MATERIALS
MATHEMATICAL MODELS
MICROSTRUCTURE
PARTICLE SIZE
POROSITY
PROGRESS REPORT
PYROLYSIS
PYROLYSIS PRODUCTS
SIZE
THERMOCHEMICAL PROCESSES