| 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 |
Checkout
Status |
| NTIS |
PB-221 159 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| 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 |
