Method of purifying gases containing nitrogen oxides and an appa

Details Method of purifying gases containing nitrogen oxides and an appa Method of purifying gases containing nitrogen oxides and an appa

1997-11-26

1999-06-15

Tran, Hien

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

422171, 422172, 422173, 422198, 422200, 422109, 422110, 110245, 122 4D, B01D 5000

Patent

active

059119560

ABSTRACT:
A method of reducing the nitrogen oxide level in the flue gases issuing from combustion units by introduction of reducing agents into contact with gases containing nitrogen oxides in first and second reducing stages, is provided. The first reducing stage is a non-catalytic stage (e.g. at temperatures over 800.degree. C.), while the second stage is a catalytic stage (e.g. at temperatures of about 300-400.degree. C.). A steam generation boiler with improved nitrogen reduction facilities is also provided. The amount of nitrogen oxides in the hot gases is reduced in the combination of the first and second reducing stages while producing steam in a steam generation boiler system, thus resulting in gases essentially free from nitrogen oxides while eliminating the possibility of NH.sub.3 (or other reducing agent) slip in the exhausted flue gases. Heat transfers in a convection section as used to establish stabilized temperature conditions for catalytic reduction.

REFERENCES:
patent: 2078947 (1937-05-01), Houdry et al.
patent: 2078948 (1937-05-01), Houdry
patent: 3900554 (1975-08-01), Lyon
patent: 4129651 (1978-12-01), Kolke et al.
patent: 4181705 (1980-01-01), Gumerman
patent: 4208386 (1980-06-01), Arand et al.
patent: 4393031 (1983-07-01), Henke
patent: 4978514 (1990-12-01), Hofmann et al.
patent: 4981660 (1991-01-01), Leach
patent: 5048432 (1991-09-01), Hofmann et al.
patent: 5133950 (1992-07-01), Oakes et al.
patent: 5139754 (1992-08-01), Luftglass et al.
patent: 5233934 (1993-08-01), Krigmont et al.
patent: 5237939 (1993-08-01), Spokoyny et al.
patent: 5286467 (1994-02-01), Sun et al.
patent: 5300270 (1994-04-01), Krigmont et al.
patent: 5304362 (1994-04-01), Madsen
patent: 5318755 (1994-06-01), Kuivalainen et al.
patent: 5407649 (1995-04-01), Anderson et al.
patent: 5555849 (1996-09-01), Wiechard et al.
"Clean Coal Today", Issue No. 7, Summer 1992, Office of Fossil Energy, U.S. Dept of Energy.

Affiliated with

Also associated with

Rating

Method of purifying gases containing nitrogen oxides and an appa does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of purifying gases containing nitrogen oxides and an appa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of purifying gases containing nitrogen oxides and an appa will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-400734