General grain model for gas-solid reactions in cylindrical pellets. [Program used to model sulfation of calcium oxide]

Technical Report · Thu Jul 01 04:00:00 EDT 1982

OSTI ID:5335148

Young, W A

A generalized grain model has been developed for gas-solid reactions of the form: A (g) + bB (s) = cC (g) + dD (s). The model accounts for pore closure, reaction reversibility, external heat and mass transfer resistance, intergrain and intragrain diffusional resistance, nonisothermality, and the presence of an inert gas. The model solves the partial differential equations using the Implicit Alternating Direction Method for the case of a cylindrical pellet. The program is slow and expensive to run but, it has been written to handle the potential instability problems except when the effective intergrain diffusitivity near the surface approaches 0. When the program was used to model the sulfation of calcium oxide, it showed that the effect of the temperature rise on the conversion versus time curve is small. The temperature rise of the chlorination of calcium oxide was large enough to significantly affect the conversion rate. 38 references, 11 figures, 4 tables.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5335148
• Report Number(s): IS-T-1005; ON: DE84007206
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000 -- Coal
Lignite
& Peat-- Combustion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORINATION
COMPUTERIZED SIMULATION
DIFFERENTIAL EQUATIONS
ENERGY TRANSFER
EQUATIONS
FLUIDS
GASES
HALOGENATION
HEAT TRANSFER
MASS TRANSFER
MATHEMATICAL MODELS
OXIDES
OXYGEN COMPOUNDS
PARTIAL DIFFERENTIAL EQUATIONS
POROSITY
SIMULATION
SOLIDS