Adaptation of CONCHAS-SPRAY to entrained coal gasification studies
The CONCHAS-SPRAY computer code was originally designed to study the coupled fluid dynamics, heat transfer, chemical reactions, and fuel spray dynamics of an engine-cylinder submodel of an internal combustion engine. This report describes the modifications and additions that were made in the physical and chemical submodels of CONCHAS-SPRAY, in order to study entrained coal gasification processes. These include a nonequilibrium radiation heat transfer model to account for radiative energy exchange between the fluid and the confining walls, a wall heat transfer model, a solid particle model that allows for stochastic variations in coal particle properties, coal devolatilization and char oxidation models, and additions to the code chemistry package to account for the cracking, reforming, and burning of the volatiles. Also, this report describes improvements that have been made in the CONCHAS-SPRAY algorithm and boundary conditions that have increased the robustness of the code and its applicability to the coal gasification study. Comparisons are made of numerical calculations of single- and two-phase jet penetration studies with experimental data. These show good to excellent agreement between the calculated and experimental measurements of jet penetration, mean and turbulent fluctuating gas velocity profiles, and solid phase velocity profiles. Also, results are presented that demonstrate some of the effects that te devolatilization and char combustion processes have on the species distributions and temperature variation within a reactor chamber. 23 refs., 16 figs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5178123
- Report Number(s):
- LA-10484-MS; ON: DE86001242
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
ALGORITHMS
C CODES
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
COMPUTER CODES
COMPUTERIZED SIMULATION
DEVOLATILIZATION
ENERGY SOURCES
ENERGY TRANSFER
ENTRAINMENT
FOSSIL FUELS
FUELS
GASIFICATION
HEAT TRANSFER
JETS
MATERIALS
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MODIFICATIONS
OXIDATION
PYROLYSIS PRODUCTS
RADIANT HEAT TRANSFER
SIMULATION
THERMOCHEMICAL PROCESSES
TURBULENCE