Combustion processes in a pulverized-coal combustor. Volume 2. User's manual for a computer program for one-dimensional coal combustion or gasification (1-DICOG)
A one-dimensional, steady-state model describing pulverized coal combustion and gasification is presented. While emphasis has been placed on the description of the coal reaction processes and gas-particle interactions, one-dimensional fluid mechanics and particle-particle, particle-wall radiation have been included. Moisture vaporization from the coal particles, multi-step coal pyrolysis, and heterogeneous char oxidation by multiple oxidizers are modeled for polydispersed coal particle sizes or types. Although the formulation is one-dimensional, mixing rates of primary and secondary streams and recirculation within the reactor have been accounted for as specified input. The resulting model predicts thermal, chemical, and physical histories for both the gaseous and particle phases. Gas-particle interactions account for appropriate diffusion and kinetic rates. Gas phase reactions are assumed to be in local chemical equilibrium. The solution technique uses predictor-corrector methods for integration of the ordinary nonlinear differential equations which are coupled with a number of auxiliary algebraic equations. Numerical step-size is self adjusting. An iterative approach is required for the radiant heat transfer calculations if the zone method is chosen. More computationally efficient diffusion and flux methods for radiation heat transfer have also been coded. Stiffness in differential energy equations is overcome by a pseudo steady-state method when needed. The generalized nature of the model allows for calculation of both coal combustion and coal gasification characteristics. User information is presented, along with a sample computation and a listing of the program. 62 references, 10 figures, 12 tables.
- Research Organization:
- Brigham Young Univ., Provo, UT (USA). Combustion Lab.
- OSTI ID:
- 5366761
- Report Number(s):
- EPRI-CS-2490-CCM-Vol.2; ON: DE84920056
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010404 -- Coal
Lignite
& Peat-- Gasification
014000* -- Coal
Lignite
& Peat-- Combustion
CHEMICAL REACTIONS
COAL FINES
COAL GASIFICATION
COMBUSTION
COMPUTER CODES
COMPUTERIZED SIMULATION
DIFFUSION
DOCUMENT TYPES
ENERGY TRANSFER
FORTRAN
GASIFICATION
HEAT TRANSFER
KINETICS
MANUALS
MATHEMATICAL MODELS
ONE-DIMENSIONAL CALCULATIONS
OXIDATION
POLLUTANTS
PROGRAMMING LANGUAGES
RADIANT HEAT TRANSFER
REACTION KINETICS
SIMULATION
THERMOCHEMICAL PROCESSES
TWO-DIMENSIONAL CALCULATIONS