Particulate processes in pulverized-coal flames. Quarterly technical progress report, January-March 1982

Technical Report · Thu Apr 01 00:00:00 EST 1982

OSTI ID:5380419

The primary objective of this study is to obtain fundamental physical data on particulate reaction processes in pulverized coal flames. The observations have indicated that the combustion of pulverized coal was affected by temperature, temperature rise, oxygen content, and particle size. Ignition and devolatization were strongly related to temperature and temperature rise. A large temperature rise would be essential for rapid ignition. A high temperature would then be important for devolatilization. After devolatilization, soot and char burnout would take place. However, the burnout of soot strings would proceed at a faster rate in an oxygen rich environment. Given a high temperature, a slightly lean condition did not seem to be sufficient to assure burnout. In the absence of knowledge of exhaust solid content and composition, it appears that small particles would burn and complete burnout more quickly than large particles. Because of the deficiency in the particle size of the 15-micron cut used in the present test, a direct interpretation was not possible. A striking observation was the persistence of soot strings under high temperature. With a residence time of over 800 msec, soot string fragments of appreciable size would linger. It appears that an experiment of the type which allows independent selection of oxygen content and gas temperature would be important to determine the overall soot burnout rate. The results will be useful to furnace design and operation.

• Research Organization: Spectron Development Labs., Inc., Costa Mesa, CA (USA)
• DOE Contract Number: AC22-80PC30300
• OSTI ID: 5380419
• Report Number(s): DOE/PC/30300-T5; ON: DE82017243
• Resource Relation: Other Information: Portions of document are illegible
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
42 ENGINEERING
BURNERS
PERFORMANCE
COAL
COMBUSTION KINETICS
DEVOLATILIZATION
IGNITION
PARTICLE SIZE
FURNACES
CHARS
COMMINUTION
EXPERIMENTAL DATA
FLAMES
HOLOGRAPHY
OXYGEN
RESEARCH PROGRAMS
SOOT
TEMPERATURE DEPENDENCE
CARBONACEOUS MATERIALS
CHEMICAL REACTION KINETICS
DATA
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
INFORMATION
KINETICS
MATERIALS
NONMETALS
NUMERICAL DATA
PYROLYSIS PRODUCTS
REACTION KINETICS
SIZE
014000* - Coal
Lignite
& Peat- Combustion
421000 - Engineering- Combustion Systems