Kinetics of coal pyrolysis and devolatilization

Technical Report · Thu Jan 01 00:00:00 EST 1987

DOI:https://doi.org/10.2172/5214676· OSTI ID:5214676

Research continued an coal pyrolysis and devolatilization. An experimentally based, conceptual model of the devolatilization of a HV bituminous coal is outlined in this repair. This model contends that the relative dominance of a process type-chemical kinetic, heat transport, mass transport -- varies with the extent of reaction for a given set of heating conditions and coal type and with experimental and with experimental conditions for a given coal types and extent of reaction. The relevant reference'' conditions of interest for direct utilization are rapid transient heating of small (< 100 micron) particles to temperatures of 1000{degrees}C or greater. The model postulatew that the overall rates of coal devolatilization should vary with coal type insofar as the characteristics of the parent coal determine the potential tar yield and the chemical characteristics of the initial tars. Experimental evidence indicates chemical characteristics and yields of primary'' tars vary significant with coal type. Consequently, the conceptual model would indicate a shift from transport to chemical dominance of rate processes with variation in coal types. Using the conceptual model, UTRC has been able to correlate initial mass loss with a heat transfer index for a wide range of conditions for high tar yielding coals. 33 refs., 30 figs., 6 tabs.

• Research Organization: United Technologies Research Center, East Hartford, CT (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC22-84PC70768
• OSTI ID: 5214676
• Report Number(s): DOE/PC/70768-10; ON: DE92000211
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
BITUMINOUS COAL
DEVOLATILIZATION
TAR
YIELDS
COAL RANK
COMBUSTION
HEAT TRANSFER
KINETICS
MOLECULAR WEIGHT
PARTICLE SIZE
PROGRESS REPORT
BLACK COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
DOCUMENT TYPES
ENERGY SOURCES
ENERGY TRANSFER
FOSSIL FUELS
FUELS
MATERIALS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
SIZE
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
&amp; Peat- Combustion
010409 - Coal
Lignite
&amp; Peat- Pyrolysis &amp; Carbonization- (1987-)