Characteristics of American coals in relation to their conversion into clean energy fuels. Quarterly technical progress report, October--December 1977

Technical Report · Wed Mar 01 04:00:00 EST 1978

DOI:https://doi.org/10.2172/6916203· OSTI ID:6916203

Spackman, W.; Davis, A.; Walker, P. L.; Lovell, H. L.; Essenhigh, R. H.; Vastola, F. J.; Given, P. H.; Suhr, N. H.

The Penn State/DOE Coal Sample Bank has been expanded. A total of 54 characterized coal samples and 232 selected printouts of coal data were provided upon request to the coal research community. Work has been conducted using nitrogen as a pyrolysis medium at 808/sup 0/C and seven size grades of the Texas Darco lignite (PSOC-412) as starting material. This work was intended to extend previous work on the effects of particle size on pyrolysis. A study is being made into the effects of low temperature oxidation on the agglomerating properties of caking coals. The effect of preoxidation in air of a highly caking coal at different temperatures on weight loss during pyrolysis up to 1000/sup 0/C and reactivity of resultant chars to air at 475/sup 0/C has been investigated. Preoxidation has essentially no effect on weight loss during pyrolysis below 450/sup 0/C. At higher temperatures, however, preoxidation results in a decrease in weight loss. Preoxidation markedly enhances subsequent char reactivity. Differential scanning calorimetry and thermogravimetric analysis have been used to study the interaction between oxygen and an unactivated Saran carbon. In the range 125-227/sup 0/C, chemisorption of oxygen, though the predominant process, is associated with a gasification reaction. The rate of the latter reaction is much higher than extrapolated from the Arrhenius plot in the temperature range 450-550/sup 0/C. In the temperature range 450-850/sup 0/C, gasification kinetics have been studied by the TGA technique. Plots of burn-off versus reaction time are linear over the 15-65% burn-off range. The Arrhenius plots consist of three distinct straight lines of different slopes, indicating that the gasification reaction occurs in three different zones.

• Research Organization: Pennsylvania State Univ., University Park (USA). Coal Research Section
• Sponsoring Organization: USDOE
• OSTI ID: 6916203
• Report Number(s): FE-2030-10
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
AGGLOMERATION
ARRHENIUS EQUATION
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
CLEANING
COAL
COAL GASIFICATION
COAL PREPARATION
COLLOIDS
COMMINUTION
CRYOGENIC FLUIDS
DATA
DECOMPOSITION
DENSITY
DISPERSIONS
ELEMENTS
EMULSIONS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL OILS
FUEL SLURRIES
FUELS
GASIFICATION
GEOLOGY
INFORMATION
INFORMATION SYSTEMS
KINETICS
LIGNITE
MECHANICAL PROPERTIES
MIXTURES
NONMETALS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
OXYGEN
PETROLEUM PRODUCTS
PETROLOGY
PHYSICAL PROPERTIES
PLASTICITY
PYROLYSIS
REACTION KINETICS
SAMPLING
SEPARATION PROCESSES
SLURRIES
SORPTION
SUSPENSIONS
THERMOCHEMICAL PROCESSES
VISCOSITY
VOLATILE MATTER
WASHING