Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1991-05-16
1993-07-06
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60286, 60303, 422183, 423212, F01N 336
Patent
active
052243460
ABSTRACT:
A method and apparatus are provided for reducing pollutants and especially nitrogen oxides, or NOx, in the exhaust gases of an engine. The apparatus includes a device for injecting ammonia into a conduit that extends between cylinder exhaust valves and a catalytic converter, to mix the ammonia with the exhaust gases. Ammonia injection occurs at a location a plurality of inches downstream of the exhaust valves to avoid burning of the ammonia by flames. The injection preferably occurs at a location where the exhaust gases are at a temperature of at least about 1200.degree.F. to cause considerable reaction of the ammonia with NOx in the exhaust gases prior to the gases reaching the catalyst, so less NOx must be removed along the catalyst. To minimize ammonia use, it is injected only for a limited period such as a minute after a cold engine is started when the catalyst is too cold to cause significant reactions, and during operation of the engine at high power levels when the greatest amounts of NOx are produced.
REFERENCES:
patent: 3449063 (1969-06-01), Griffing et al.
patent: 3599427 (1971-08-01), Jones
patent: 4188364 (1980-02-01), Gladden
patent: 4403473 (1983-09-01), Gladden
patent: 4854123 (1989-08-01), Inoue
patent: 5021227 (1991-06-01), Kobayashi
Variation of Selectivity by Dolbear et al--"Advances in Chemical Series" 1975, vol. 143, pp. 32-38.
Thermocatalytic Detection of NOx by Innes--"Advances in Chemical Series" 1975 vol. 143, pp. 14-15.
Gas Phase Decomposition by Muzio et al.--"Proceedings of International Symposium on Combustion" 1976 vol. 16, pp. 199-208.
Berriman Lester P.
Davis James W.
Hylton William M.
Zabsky John M.
Davis James W.
Freilich Arthur
Hart Douglas
Hornbaker Robert D.
Rosen Leon D.
LandOfFree
Engine NOx reduction system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Engine NOx reduction system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Engine NOx reduction system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1682742