Claims
- 1. A furnace system for the reduction of nitrogen oxides, comprising:
- (a) a refractory lined furnace having a first and second chamber of substantially the same diameter; the first end of said first chamber being a plane surface;
- (b) first axial means for introducing gaseous fuel and stoichiometric air for burning said fuel into said first chamber at said first end, and including ignition means for igniting said fuel;
- (c) second means to radially inject combustible hydrocarbon and steam at a plane close to said first end of said first chamber to create a reducing atmosphere in said first chamber;
- (d) third means for radially introducing nitrogen oxide containing gases into the reducing atmosphere in said first chamber at the first end of said first chamber whereby said nitrogen oxides will be reduced;
- (e) passage means of diameter less than said chamber diameter at the second end of said first chamber leading to the first end of said second chamber for the flow of gases from said first chamber to said second chamber, said passage means having transverse parallel walls;
- (f) fourth means for radially introducing cooling means into said second chamber at its said first end to reduce the temperature of the gases to within the range of 1250.degree. to 2000.degree. F. entering from said first chamber to a temperature low enough to prevent thermal regeneration of nitrogen oxides; and
- (g) fifth means downstream of said fourth means near the second end of said second chamber for radially introducing air into said second chamber for burning combustibles remaining in the gases in said second chamber.
- 2. The furnace system as in claim 1 in which said cooling means comprises a stream of cooling medium injected into said second chamber.
Parent Case Info
This is a division of application Ser. No. 228,823, filed Feb. 24, 1972 now U.S. Pat. No. 3,911,083 issued Oct. 7, 1975.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
2375795 |
Krejci |
May 1945 |
|
3195608 |
Voorheis et al. |
Jul 1965 |
|
Divisions (1)
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Number |
Date |
Country |
Parent |
228823 |
Feb 1972 |
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