Effects of pyrolysis conditions on coal devolatilization

Conference · Mon Aug 01 04:00:00 EDT 1983 · Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States)

OSTI ID:7090074

Freihaut, J D; Seery, D J

The formation and evolution of PAH species in coal devolatilization is observed to be a sensitive function of the mix of molecular species present in the parent coal. Through high volatile bituminous coals and within moderate heating conditions, PAH yields increase with apparent aromaticity of the coal. Those coals having the greater aromaticity, as indicated by infrared absorption characteristics, give consistently greater tar yields than less aromatic samples. Such coals also show less variation in tar yields with changes in heating rate. For moderate heating rates to final temperatures less than 1000/sup 0/ C, the coal nitrogen evolution mirrors the parent coal evolution as char, tar or light gas species on a mass fraction basis. Heating rates of 1/sup 0/ C/sec or less are observed to lower tar yields of bituminous coals while increasing char and light gas yields. On the other hand, programmed heating rates of 10/sup 5/-10/sup 6/ /sup 0/C/sec also result in a decrease in tar yields with an increase in solid species products. A fraction of these solids appear to be soot particles. Gaseous yields of coals subjected to such high thermal fluxes show C/sub 2/H/sub 2/, CO, CH/sub 4/, HCN, C/sub 2/H/sub 4/ and polyacetylenes as the predominant gas phase species.

• Research Organization: United Technologies Research Center East Hartford, CT
• OSTI ID: 7090074
• Report Number(s): CONF-830814-
• Conference Information: Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Journal Volume: 28:4
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010406* -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
AROMATICS
CARBONACEOUS MATERIALS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COAL RANK
COMBUSTION KINETICS
COMBUSTION PRODUCTS
DECOMPOSITION
DEVOLATILIZATION
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
HEATING RATE
HYDROCARBONS
KINETICS
MATERIALS
OIL YIELDS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
POLYCYCLIC AROMATIC HYDROCARBONS
PYROLYSIS
PYROLYSIS PRODUCTS
PYROLYTIC GASES
REACTION KINETICS
TAR
THERMOCHEMICAL PROCESSES
YIELDS