skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Heterogeneous gas-solid reaction studies in a high temperature diffusion cell: the effect of sodium-chloride on sulfur capture in fluidized bed combustion

Abstract

The single pellet high temperature diffusion cell reactor was designed and constructed to measure the effective diffusivity of argon and nitrogen through the porous limestone matrix during calcination, sintering and sulfation reactions. The results reveal that the following equation can be used to estimate the effective diffusivity of argon through calcined Greer limestone as a function of temperature (775 to 1000/sup 0/C) and calcination time. D/sub Ar/ = 62.3 e/sup -14600/RT/ + 113.6 theta e/sup -29400/RT/ where D/sub Ar/ is the effective diffusivity of argon in cm/sup 2//sec, T is the absolute temperature in /sup 0/K, and theta is the calcination time in hours. The diffusivity of argon was determined during the sulfation reaction of calcined Greer limestone with an SO/sub 2//O/sub 2/ gas mixture. The conversion of calcined Greer limestone to calcium sulfate was determined by material balance. Even after complete sulfation of surface layer, exposure to salt vapor increased the size of the pores. The diffusivity of gases through the porous structure and the saturation reaction conversion increased with NaCl vapor addition. The conversion increased by a factor of 3.26 at 943/sup 0/C and 3.16 at 841/sup 0/C. A range of 43% to 49% conversion was obtained atmore » the surface layer between 840/sup 0/C and 943/sup 0/C. NaCl vapor exposure resulted in insignificant change in the reaction extent at 756/sup 0/C, with a saturation conversion of 28%.« less

Authors:
Publication Date:
OSTI Identifier:
5923577
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 01 COAL, LIGNITE, AND PEAT; ARGON; DIFFUSION; CALCIUM CARBONATES; CHEMICAL REACTIONS; FLUIDIZED-BED COMBUSTION; OXYGEN; SULFUR DIOXIDE; CALCINATION; CONSTRUCTION; DESIGN; EQUATIONS; LIMESTONE; MATHEMATICS; PELLETS; POROSITY; REACTORS; SINTERING; SODIUM CHLORIDES; SULFIDATION; TEMPERATURE DEPENDENCE; TIME DEPENDENCE; VERY HIGH TEMPERATURE; ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATE ROCKS; CARBONATES; CHALCOGENIDES; CHLORIDES; CHLORINE COMPOUNDS; COMBUSTION; DECOMPOSITION; ELEMENTS; FABRICATION; FLUIDS; GASES; HALIDES; HALOGEN COMPOUNDS; NONMETALS; OXIDATION; OXIDES; OXYGEN COMPOUNDS; PYROLYSIS; RARE GASES; ROCKS; SEDIMENTARY ROCKS; SODIUM COMPOUNDS; SULFUR COMPOUNDS; SULFUR OXIDES; THERMOCHEMICAL PROCESSES; 400201* - Chemical & Physicochemical Properties; 400800 - Combustion, Pyrolysis, & High-Temperature Chemistry; 014000 - Coal, Lignite, & Peat- Combustion

Citation Formats

Bardakci, T. Heterogeneous gas-solid reaction studies in a high temperature diffusion cell: the effect of sodium-chloride on sulfur capture in fluidized bed combustion. United States: N. p., 1980. Web.
Bardakci, T. Heterogeneous gas-solid reaction studies in a high temperature diffusion cell: the effect of sodium-chloride on sulfur capture in fluidized bed combustion. United States.
Bardakci, T. 1980. "Heterogeneous gas-solid reaction studies in a high temperature diffusion cell: the effect of sodium-chloride on sulfur capture in fluidized bed combustion". United States.
@article{osti_5923577,
title = {Heterogeneous gas-solid reaction studies in a high temperature diffusion cell: the effect of sodium-chloride on sulfur capture in fluidized bed combustion},
author = {Bardakci, T},
abstractNote = {The single pellet high temperature diffusion cell reactor was designed and constructed to measure the effective diffusivity of argon and nitrogen through the porous limestone matrix during calcination, sintering and sulfation reactions. The results reveal that the following equation can be used to estimate the effective diffusivity of argon through calcined Greer limestone as a function of temperature (775 to 1000/sup 0/C) and calcination time. D/sub Ar/ = 62.3 e/sup -14600/RT/ + 113.6 theta e/sup -29400/RT/ where D/sub Ar/ is the effective diffusivity of argon in cm/sup 2//sec, T is the absolute temperature in /sup 0/K, and theta is the calcination time in hours. The diffusivity of argon was determined during the sulfation reaction of calcined Greer limestone with an SO/sub 2//O/sub 2/ gas mixture. The conversion of calcined Greer limestone to calcium sulfate was determined by material balance. Even after complete sulfation of surface layer, exposure to salt vapor increased the size of the pores. The diffusivity of gases through the porous structure and the saturation reaction conversion increased with NaCl vapor addition. The conversion increased by a factor of 3.26 at 943/sup 0/C and 3.16 at 841/sup 0/C. A range of 43% to 49% conversion was obtained at the surface layer between 840/sup 0/C and 943/sup 0/C. NaCl vapor exposure resulted in insignificant change in the reaction extent at 756/sup 0/C, with a saturation conversion of 28%.},
doi = {},
url = {https://www.osti.gov/biblio/5923577}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1980},
month = {Tue Jan 01 00:00:00 EST 1980}
}

Thesis/Dissertation:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this thesis or dissertation.

Save / Share: