An engineering model for coal devolatilization

Technical Report · Fri Sep 01 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/5500202· OSTI ID:5500202

Lau, Chun Wei; Niksa, S.

There are three distinct modeling projects in this program: (1) an expedient reaction model for coal devolatilization for large scale combustor simulators; (2) a theoretical framework to explain the behavior of different coal types; and (3) an analysis of the chemistry, heat and mass transport in the vicinity of individual coal particles, to begin to describe the initial stages of the combustion of entrained coal particles. In the third activity, the transport analyses of devolatilizing and oxidizing coal particles, a two-component model which resolves tar and noncondensibles was formulated this quarter, and implemented in a computer simulator; this model is called the AEM3. The flux of tar and noncondensibles is now described with FLASHTWO, our engineering kinetics model. The AEM3 resolves tar and noncondensibles and illustrates the disparate growth rates of their concentration profiles. The AEM3 simulations also convey interesting implications for ignition mechanisms. Most importantly, resolving the tar and noncondensibles seems to considerable clarify homogeneous ignition mechanisms. 4 refs., 7 figs., 2 tabs.

• Research Organization: Stanford Univ., CA (USA). High Temperature Gasdynamics Lab.
• Sponsoring Organization: DOE/FE
• DOE Contract Number: FG22-88PC88900
• OSTI ID: 5500202
• Report Number(s): DOE/PC/88900-5; ON: DE90003043
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL TAR
COMBUSTION
DEVOLATILIZATION
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
IGNITION
KINETICS
MASS TRANSFER
MATERIALS
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
PRESSURE EFFECTS
PROGRESS REPORT
SIMULATION
TAR
THERMOCHEMICAL PROCESSES
YIELDS