An engineering model for coal devolatilization
There are three different 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. The engineering model, called FLASHTWO, was developed before this program began, and has been validated against several wire-grid studies of HVA bituminous coals. Parameters for FLASHTWO for various coal types have been assigned to reproduce the predictions from the full depolymerization model developed in Task 2, and used in the simulations of the initial stages of pulverized coal combustion in Task 3. A depolymerization model has been developed which rationalizes all aspects of coal type effects on rapid coal devolatilization. The theory is called FLASHCHAIN. Task 3, the analysis of the initial stages of pulverized coal combustion, was pursued in two stages. One study omits homogenous chemistry entirely, and focuses on the transport analysis including primary devolatilization, convective heat and mass transport, heterogeneous oxidation at the particle surface. The second study illustrates volatiles combustion in the limit of diffusion-limited combustion rates. This rate analysis if formulated in terms or primary devolatilization, convective heat and mass transport, homogeneous combustion of tar and noncendensibles in a flame sheet, and heterogeneous oxidation at the particle surface.
- Research Organization:
- Stanford Univ., CA (United States). High Temperature Gasdynamics Lab.
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-88PC88900
- OSTI ID:
- 5600543
- Report Number(s):
- DOE/PC/88900-T2; ON: DE91011274
- Country of Publication:
- United States
- Language:
- English
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An engineering model for coal devolatilization
An engineering model for coal devolatilization
Related Subjects
010600 -- Coal
Lignite
& Peat-- Properties & Composition
014000* -- Coal
Lignite
& Peat-- Combustion
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTIONS
COAL
COAL RANK
COMBUSTION
DECOMPOSITION
DEPOLYMERIZATION
DEVOLATILIZATION
DOCUMENT TYPES
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
HEATING RATE
MATERIALS
MATHEMATICAL MODELS
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
PRESSURE EFFECTS
PROGRESS REPORT
PYROLYSIS PRODUCTS
TAR
THERMOCHEMICAL PROCESSES