Volatile production during preignition heating. Final technical report, 15 September 1980-30 September 1982

Technical Report · Sat Oct 01 00:00:00 EDT 1983

DOI:https://doi.org/10.2172/5295890· OSTI ID:5295890

Ballantyne, A.; Chou, H.; Flusberg, A.; Neoh, K.; Orozco, N.; Stickler, D.

Pulverized coal particles, in a flowing inert nitrogen stream, have been heated by high power Carbon Dioxide Laser. The consequence of such an irradiation have proved to be both novel and surprising as a result of the rapid quenching of primary coal products. It ahs been found that the gas phase yield from such heating (typically, temperatures in excess of 1400 K at rates approx. 2 x 10/sup 5/ K/s) is very small (< 0.2 percent of coal carbon and hydrogen). Analysis of the solid residue has shown the presence of fine lacy particulate chains of material of 0.1 ..mu..m diameter, which appears to be soluble in tetrahydrofuran. The yields of solute were significantly much higher than for raw coals. Molecular weight of the solute material was high, being in the range of 600 to 3000. The above and substantiating evidence point to a new mechanism of high heating rate pyrolysis in which only tar-like materials are produced as primary products from the coal. It is hypothesized that gas phase products are primarily the result of secondary reactions of these primary products in the hot gas environments usually employed by other heating techniques.

• Research Organization: Avco-Everett Research Lab., Inc., Everett, MA (USA)
• DOE Contract Number: AC22-80PC30291
• OSTI ID: 5295890
• Report Number(s): DOE/PC/30291-6; ON: DE84006631
• Resource Relation: Other Information: Portions are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
LASER-RADIATION HEATING
VOLATILE MATTER
PRODUCTION
CARBON DIOXIDE LASERS
MATHEMATICAL MODELS
NITROGEN
PARTICULATES
PYROLYSIS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GAS LASERS
HEATING
LASERS
MATERIALS
MATTER
NONMETALS
PARTICLES
PLASMA HEATING
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
&amp; Peat- Combustion