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RECORD NUMBER: 461 OF 1214

OLS Field Name OLS Field Data
Main Title Evaluation of Problems Related to Scaling in Limestone Wet Scrubbing.
Author Berkowit, Joan B. ;
CORP Author Little (Arthur D.), Inc., Cambridge, Mass.
Year Published 1973
Report Number EPA-68-02-0215; R2-73-214;
Stock Number PB-221 159
Additional Subjects ( Scrubbers ; Scaling) ; ( Limestone ; Scrubbers) ; ( Sulfur dioxides ; Adsorption) ; ( Air pollution ; Sulfur dioxide) ; Calcium carbonates ; Reaction kinetics ; Chemical equilibrium ; Performance evaluation ; Sulfur trioxide ; Scale(Corrosion) ; Oxygen ; pH ; Limestone scrubbing ; Alkaline scrubbing ; Wet methods
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-221 159 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 158p
Abstract The report defines the relationship between scale formation and scrubber chemistry, based on thermodynamic analyses and bench-scale scrubber experiments, and includes a review of scaling problems in limestone wet scrubbing systems. It is assumed that mechanical scale deposition (due to wet/dry interfaces, stagnant areas, or poor gas/liquid distribution) can be controlled by good engineering design. Approaches to controlling chemical scale deposition are: pH control, highL/G, seeding, high residence time in a holding tank, temperature control, and oxidation control. It is shown that SO2 removal efficiency is a linear function of pH for 0.5% CaSO3 slurries, 0.5% CaCO3 and 0.6% limestone slurries, and 1% CaCO3 slurries. The CaCO3 scrubbing system is non-scaling, but removal efficiencies are limited by the SO3/HSO3 equilibrium to about 50%. In CaCO3 scrubbers, SO3 scaling can be minimized. A 100-125F temperature increase seems to increase the rate of scale deposition and, in the presence of O2, can lead to catastrophic scaling via a cementing reaction initiated by the precipitation of anhydrite. (Modified author abstract)
Supplementary Notes Prepared in cooperation with National Environmental Research Center, Research Triangle Park, N.C.
Highlights Notes Defines the relationship between scale formation and scrubber chemistry.
NTIS Title Notes Final rept..
PUB Date Free Form Apr 73,
Category Codes 7A; 13B; 68A#; 59B
NTIS Prices PC A08/MF A01
Document Type NT
Cataloging Source NTIS/MT
Control Number 326563268
Origin NTIS
Type CAT