NO{sub 2} absorption in limestone slurry for flue gas desulfurization
Technical Report
·
OSTI ID:121455
- Univ. of Texas, Austin, TX (United States)
We have measured rates of NO{sub 2} absorption and sulfate oxidation in a highly characterized stirred cell contactor, at pH 4.5 to 6.0, 25 to 55{degrees}C, and solution compositions typical of limestone slurry scrubbing. The rate constants of the reactions between NO{sub 2} and sulfate (SO{sub 3}=), bisulfite (HSO{sub 3}-) and water at 55{degrees}C were 11.2x10{sup 5} M{sup -1}s{sup -1}, 2.8x10{sup 4} M{sup -1}s{sup -1}, and 1.6xl0{sup 7} M{sup -1}s{sup -1}, respectively. NO{sub 2} absorption catalyzes sulfate oxidation in the presence of oxygen, which may lead to depletion of sulfate at the interface and reduce the rate of NO{sub 2} absorption. For every mole of NO{sub 2} absorbed, 4 to 160 moles of sulfite may be oxidized. Higher pH favors NO{sub 2} absorption, while additives such as Mg{sup 2+}, Ca{sup 2+}, and Cl{sup -} inhibit NO{sub 2} removal. The presence of buffer or oxidation inhibitor enhances the rate of NO{sub 2} absorption.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 121455
- Report Number(s):
- EPRI-TR--105258-Vol.3; CONF-950332--Vol.3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dissolution rate of calcium sulfite hemihydrate in flue gas desulfurization processes
NOx influence on sulfite oxidation and scaling in lime/limestone flue gas desulfurization (FGD) systems
Sodium-limestone double alkali flue gas desulfurization method
Journal Article
·
Fri Jan 31 23:00:00 EST 1986
· Environ. Prof.; (United States)
·
OSTI ID:5787627
NOx influence on sulfite oxidation and scaling in lime/limestone flue gas desulfurization (FGD) systems
Journal Article
·
Mon Mar 31 23:00:00 EST 1980
· Environ. Sci. Technol.; (United States)
·
OSTI ID:6683253
Sodium-limestone double alkali flue gas desulfurization method
Patent
·
Tue Oct 18 00:00:00 EDT 1983
·
OSTI ID:5271185