Prediction and measurement of optimum operating conditions for entrained coal-gasification processes. Volume 2. User's manual for a computer program for 1-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 non-linear differential equations which are coupled with a number of auxiliary algebraic equations. Numerical stepsize is self adjusting. An iterative approach is required for the radiant heat transfer calculations if the zone method is chosen. More computationally efficiency 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.
- Research Organization:
- Brigham Young Univ., Provo, UT (USA)
- DOE Contract Number:
- AC21-80MC14380
- OSTI ID:
- 5416136
- Report Number(s):
- DOE/MC/14380-1210-Vol.2; ON: DE82015610
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL GASIFICATION
MATHEMATICAL MODELS
COMBUSTION
CHEMICAL REACTIONS
COAL
COMPUTER CALCULATIONS
FLUID MECHANICS
MANUALS
ONE-DIMENSIONAL CALCULATIONS
PYROLYSIS
STEADY-STATE CONDITIONS
CARBONACEOUS MATERIALS
DECOMPOSITION
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
MATERIALS
MECHANICS
OXIDATION
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification
014000 - Coal
Lignite
& Peat- Combustion