Optimization of coal devolatilization model parameters for comprehensive gasification and combustion models
Parameters for empirical devolatilization models are recommended for lignite and bituminous coals. These parameters were generated by combining optimization algorithms with rigorous particle and flow field modeling of experimental facilities. PCGC-2, a comprehensive, axisymmetric, gasification and combustion code developed at the Brigham Young University Combustion Laboratory, was used to predict the velocity, temperature, and radiation fields of experimental apparatus used to collect devolatilization data. The effect of changing devolatilization models on these fields were neglected due to very low particle loadings. These fields were subsequently entered into a rigorous particle reaction model and the particle response to them was predicted. A particle model predicted the trajectories, temperature, and reaction rates of coal particles in the flow fields described above. The particle model and its results are discussed. The particle model was coupled with an optimization algorithm to determine optimum parameters for the two-reaction devolatilization model. Generalized reduced gradient (GRG) and sequential quadratic programming (SQP) methods were used in performing the optimization with OPIDES, an optimization program developed at Brigham Young University. The model parameters were optimized over six coal heat-up rates for each coal type. Statistical analyses of the residual sum of squares for the optimized two-reaction model revealed that there was no significant lack of fit of the data as compared to the inherent variability of the data. 4 refs., 9 figs., 1 tab.
- Research Organization:
- Brigham Young Univ., Provo, UT (USA). Combustion Lab.
- OSTI ID:
- 6006006
- Report Number(s):
- CONF-8604144-5; ON: DE86010288
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010404 -- Coal
Lignite
& Peat-- Gasification
010406* -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
014000 -- Coal
Lignite
& Peat-- Combustion
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
COMBUSTION
COMPUTER CODES
DEVOLATILIZATION
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
LIGNITE
MATERIALS
MATHEMATICAL MODELS
OXIDATION
P CODES
THERMOCHEMICAL PROCESSES