ISSN:
1572-8986
Keywords:
Flue gas
;
SO2/NO x removal
;
pulsed corona discharge
;
UV absorption
;
synergetic effect
;
aerosols
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Technology
Notes:
Abstract Experiments have been performed using pulsed high-voltage discharges with the aim of removing NO and SO 2 from flue gas obtained from a methane burner. It is found that the NO conversion is strongly increased by the addition of SO 2 or NH 3 . When both gases are added simultaneously the increase almost disappears. The synergetic effect can be maintained, as is shown, when NH 3 is introduced much later than SO 2 . The SO 2 removal is already 70% upon stoichiometric addition of NH 3 , but the electric discharge improves this to 〉95% and reduces the NH 3 leak to a few ppm. This increase is probably related to aerosol production by the pulsed discharge which enhances the ammonium salt production. A so-called “history effect” is observed, i.e., the removal of NO and SO 2 depends on the time that is taken to reach the required energization. It appears that the discharge has to create favorable conditions for the cleaning process. Using the synergetic and history effects the best cleaning result, at initial concentrations of 300 ppm, is 80% NO removal and 95% SO 2 removal with 3 ppm NH 3 leak. In this case the energy cost is 13 eV/NO (or a yield of 90 g NO and 200 g SO 2 per kWh). Possibilities for further improvement are indicated.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1021793327507
Permalink
