Modeling of fluidized-bed combustion of coal. Volume I. AFBC system model description. Final report
The system model has been developed for the simulation of AFBC performances at various conditions. With given input values, the model characterizes fluid dynamical behavior of the bed and calculates combustion efficiency, sulfur retention efficiency, heat transfer coefficients for the tubes, emission of NO and CO, etc. The system model is a steady state model, so it does not simulate dynamic change of the FBC performance with time. Even at steady state conditions comprehensive modeling of FBC System is a complicated task. Thus it is inevitable to use a digital computer for model calculations. The system model is coded in FORTRAN for Multics which is the operating system of a Honeywell machine at M.I.T. Information Processing Center. A specific subsystem called TPSA was developed within Multics to facilitate the use of the system model. To use the model outside the TPSA one should modify input/output interphase because the model is tuned to TPSA environment which is specially designed for the system model in Multics environment. Conceptually the model consists of five component submodels: fluid dynamics, combustion and CO emission, heat transfer, desulfurization, and NO. The relationship among submodels is schematically depicted in Figure 1. Calculation results of fluid dynamics (i.e., bed height, characteristics of bubbles, etc.) are used as input to other submodels, and combustion calculation results as input to NO model, and so on. In this modular structure we have tried to make it easier for the experts of each field to concentrate on their specific field for the model development. These component models are in turn transformed to about 50 fortran subroutines which are for one or more of the submodels. In this report descriptions of component models are given and the list of input/output variables and subroutines is in appendices. Also is given a sample calculation to demonstrate the use of the model.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Energy Lab.
- DOE Contract Number:
- AC21-81MC16000
- OSTI ID:
- 6330841
- Report Number(s):
- DOE/MC/16000-1294-Vol.1; ON: DE83001905
- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
FLUIDIZED-BED COMBUSTORS
MATHEMATICAL MODELS
SIMULATION
COAL
COMPUTER CALCULATIONS
FLUIDIZED-BED COMBUSTION
STEADY-STATE CONDITIONS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTORS
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
OXIDATION
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion
421000 - Engineering- Combustion Systems