Main Title |
Development of New and/or Improved Aqueous Processes for Removing SO2 from Flue Gases. Volume II. |
Author |
Graef, A. F. ;
Gressing, L. E. ;
Mille, F. E. ;
|
CORP Author |
Envirogenics Co., El Monte, Calif. |
Year Published |
1970 |
Report Number |
PH-86-68-77; 0620; |
Stock Number |
PB-196 781 |
Additional Subjects |
( Air pollution ;
Sulfur dioxide) ;
( Adsorption ;
Sulfur dioxide) ;
( Zinc oxides ;
Adsorbents) ;
( Air pollution control equipment ;
Scrubbers) ;
( Sulfites ;
Oxidation) ;
Feasibility ;
Cost estimates ;
Economic analysis ;
Operating costs ;
Nitrogen oxides ;
Particle size ;
Fluidized bed processing ;
Roasting ;
Nitrogen dioxide ;
Flue gases ;
Materials recovery ;
Sodium sulfites ;
Carbonates ;
Magnesium oxides ;
Osmosis ;
Combustion products ;
Iron ;
Waste gas recovery ;
Air pollution control
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB-196 781 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
172p |
Abstract |
Efficient absorption of SO2 at flue gas concentrations can be effected through the use of dry, fluidized basic materials in the range of 50 to 60 C, if sufficient water is incorporated into the gas phase upstream of sorbent contactor. The formation of sulfate can be essentially eliminated in a fluidized bed absorber, and reduced to a very low value in an aqueous absorber, through the use of ferrous ion in an aqueous prescrubber to reduce NO2 to NO. The thermal decomposition of both zinc and magnesium sulfites is markedly promoted by the presence of steam. A new process for the removal of SO2 from flue gas is described in which dry fluidized zinc oxide is used as the absorbent. The oxide is recovered for reuse upon thermal decomposition of the resulting sulfite, and the liberated SO2 is recovered as such. Little or no sulfate is formed. NOx (especially NO2) is the major contributor to oxidation of the sorbent in aqueous solution systems. The efficiency of SO2 removal from flue gas is not affected by the presence of NOx. The economics of the conceptualized fluidized-bed zinc oxide process appear to be superior to other regenerable processes for the removal of SO2 from flue gases. (Author) |
Supplementary Notes |
See also Volume 1, PB-196 780. |
NTIS Title Notes |
Final rept.. |
PUB Date Free Form |
Oct 70, |
Category Codes |
7A; 13B; 59B; 68A |
NTIS Prices |
PC A08 MF A01 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
326515533 |
Origin |
NTIS |
Type |
CAT |