Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1996-09-10
1998-12-22
Argenbright, Tony M.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60286, 60297, 60301, 60311, F01N 302, F01N 308, F01N 336
Patent
active
058507353
ABSTRACT:
According to the present invention, SO.sub.X in the exhaust gas of an internal combustion engine is absorbed by a sulfate absorbent which absorbs SO.sub.X in the exhaust gas when the temperature is lower than a releasing temperature and releases the absorbed SO.sub.X when the temperature becomes higher than the releasing temperature. When the exhaust gas temperature increases during the operation of the engine and reaches the releasing temperature, the temperature of the exhaust gas flowing into the sulfate absorbent is further raised to a predetermined temperature by supplying fuel to the exhaust gas passage upstream of the sulfate absorbent. The ratio of SO.sub.3 in the SO.sub.X mixture released from the sulfate absorbent changes in accordance with the temperature, and takes the highest value at a certain temperature (i.e., a peak temperature). Therefore, when the exhaust gas temperature is raised above the peak temperature, the ratio of SO.sub.3 in the SO.sub.X mixture released from the sulfate absorbent decreases as the temperature increases. In the present invention, the above-noted predetermined temperature is selected in such a manner that the ratio of SO.sub.3 at this predetermined temperature becomes lower than the ratio of SO.sub.3 at the releasing temperature. Therefore, when SO.sub.X is released from the sulfate absorbent, the amount of SO.sub.3, i.e., the amount of particulate matter released into the atmosphere can be maintained at a low level.
REFERENCES:
"Patent Abstracts of Japan", vol. 17, No. 400 (C-1089), abstract of JP-5-076771, Jul. 1993.
"Patent Abstracts of Japan", vol. 12, No. 409 (M-758), abstract of JP-63-150441, Oct. 1988.
"Patent Abstracts of Japan", vol. 14, No. 395 (M-1016), abstract of JP-2-149715, Aug. 1990.
Araki Yasushi
Mizuno Tatsuji
Tanaka Toshiaki
Argenbright Tony M.
Toyota Jidosha & Kabushiki Kaisha
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