Activation and reactivity of calcareous sorbents toward sulfur dioxide

The reactivity of several calcareous sorbents to SO sub(2) absorption is assessed in a laboratory-scale reactor under conditions representative of those encountered in the radiant zones of pulverized-coal-fires utility boilers. Rate of calcination, surface area development, regeneration of gas-phase...

Full description

Saved in:
Bibliographic Details
Published in:Environmental science & technology 1985-11, Vol.19 (11), p.1065-1072
Main Authors: Cole, Jerald A, Kramlich, John C, Seeker, W. Randall, Heap, Michael P, Samuelsen, Gary S
Format: Article
Language:English
Subjects:
Air pollution caused by fuel industries
Applied sciences
Atmospheric pollution
Combustion and energy production
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Pollution
Pollution reduction
Prevention and purification methods
Stack gas and industrial effluent processing
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The reactivity of several calcareous sorbents to SO sub(2) absorption is assessed in a laboratory-scale reactor under conditions representative of those encountered in the radiant zones of pulverized-coal-fires utility boilers. Rate of calcination, surface area development, regeneration of gas-phase sulfur species, and SO sub(2) capture ability are examined as a function of gas-phase environment and sorbent type. The sulfation reaction was experimentally decoupled from the calcination process, and over 50% conversion of calcium to sulfate was observed for one sorbent in 0.6 s. Sorbent reactivity to SO sub(2) is principally governed by specific surface area of the calcined sorbent, although sorbent type is a secondary influence. Peak sorbent temperature during calcination is the dominant factor governing surface area development for a given sorbent. The results demonstrate that (1) sorbent injection into the combustion zone (T > 1200 degree C) for SO sub(2) control is not optimal, and (2) a significant increase in sorbent reactivity will be attained by calcination at temperatures below 1200 degree C, the lowest value assessed in the present experiment.
ISSN:0013-936X
1520-5851
DOI:10.1021/es00141a007