Studies on the reaction of calcined limestone with sulfur dioxide: Technical progress report for the period January-March 1987

Technical Report · Wed Apr 01 04:00:00 EST 1987

OSTI ID:6829914

Sotirchos, S V

The primary objective of the project is the investigation of the reaction of calcined limestone with SO/sub 2/ with particular attention paid to the effects of the pore structure properties and of the intraparticle diffusion process on the sorptive capacity of the reacting limestone particles. The following tasks have been identified in the project: (1) development of structural models for gas-solid reactions with solid product; (2) development of flux models for diffusion in porous solids; (3) reactivity evolution studies; (4) pore structure evolution studies; and intraparticle diffusion studies. During the first quarter of the 1987 calendar year, our research efforts primarily focused on Tasks 2, 3, 4, and 5. The effects of particle size on the transient behavior of calcined limestone particles reacting in oxygen and sulfur dioxide were investigated using three stone samples. The results showed that the intensity of particle size effects depended strongly on the origin of the calcined sample. Preliminary pore size distribution measurements suggested that the particle size effects must be related closely to the pore size distribution of the calcined sample. Our analysis of the problem of diffusion in random pore networks was extended for application to multicomponent diffusion, and a novel procedure for deriving flux expressions for multicomponent diffusion in pore networks was developed. Computer simulation results obtained by direct solution of the diffusion equation in the pore network showed that the flux models we developed provide excellent approximations to the exact results. However, it was found that flux models obtained by direct application of the smooth field approximation always lead to overestimation of the fluxes and of the effective diffusivities. 13 refs., 4 figs., 1 tab.

• Research Organization: Rochester Univ., NY (USA). Dept. of Chemical Engineering
• DOE Contract Number: FG22-85PC80520
• OSTI ID: 6829914
• Report Number(s): DOE/PC/80520-T7; ON: DE87009539
• Country of Publication: United States
• Language: English

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ABSORPTION
CALCINATION
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DECOMPOSITION
EXPERIMENTAL DATA
INFORMATION
LIMESTONE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
POROSITY
PYROLYSIS
REMOVAL
RESEARCH PROGRAMS
ROCKS
SEDIMENTARY ROCKS
SIZE
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE