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Secondary air injection

About: Secondary air injection is a research topic. Over the lifetime, 11452 publications have been published within this topic receiving 112147 citations.


Papers
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Patent
12 Oct 1995
TL;DR: In this article, an arrangement for the treatment of exhaust gases from a compression-ignition internal combustion engine, in which, fuel is metered via a metering valve and introduced into the exhaust system via an evaporator to promote the action of a reduction catalyst arranged on the downstream side of the engine.
Abstract: An arrangement for the treatment of exhaust gases from a compression-ignition internal combustion engine, in which, fuel is metered via a metering valve and introduced into the exhaust system via an evaporator to promote the action of a reduction catalyst arranged on the downstream side of the engine.

37 citations

Patent
20 Jun 1989
TL;DR: In this paper, an atomized spray of a reagent solution that absorbs the contaminants in the exhaust gases is used to promote the absorption of the contaminants into solution with the atomized reagent spray, which is promoted by contact of the spray and exhaust gases on the surface of fibrous batting.
Abstract: Exhaust gases from a process fired boiler are diverted from a stack prior to emission to the atmosphere through a duct system to a plurality of series connected heat exchangers. The exhaust gases are progressively reduced from an elevated temperature, for example in the range between about 350°-525° F., in stages to an ambient temperature of about 50° F. At each stage heat from the exhaust gases is transferred from the gases to another medium, such as water, which is fed back to the boiler to reduce the energy cost of operating the boiler. At ambient temperature the exhaust gases are subjected to an atomized spray of a reagent solution that absorbs the contaminants in the exhaust gases. Absorption of the contaminants into solution with the atomized reagent spray is promoted by contact of the spray and exhaust gases on the surface of a fibrous batting. With the exhaust gases at ambient temperature the percentage of contaminants in the flue gas that enters into solution with the reagent is substantially increased. Thus the reagent absorbs the contaminants, and the exhaust gases are emitted after further moisture separation substantially free of contaminants.

37 citations

Patent
06 Jul 1967

37 citations

Patent
06 Dec 1972
TL;DR: In this paper, a V-8 internal combustion engine with an inlet manifold disposed between the banks of cylinders and a pair of exhaust manifolds disposed outboard of the bank of cylinders has a converter unit containing reducing and oxidizing catalyst beds coupled to each exhaust manifold.
Abstract: A V-8 internal combustion engine with an inlet manifold disposed between the banks of cylinders and a pair of exhaust manifolds disposed outboard of the banks of cylinders has a converter unit containing reducing and oxidizing catalyst beds coupled to each exhaust manifold. During a warm-up mode, exhaust gases from both banks of cylinders pass through a heat exchange region beneath the inlet manifold and then enter the conveyor units and pass through the catalyst beds. Air injected at the exhaust ports during the warm-up mode supports oxidation of hydrocarbons and carbon monoxide, and the hot exhaust gases promote evaporation of fuel in the inlet manifold and heat the catalyst beds. After the warm-up mode, a converter mode is entered in which exhaust gases are discharged from the exhaust manifolds directly into the converter units and pass through the catalyst beds. A reducing atmosphere provided in the first catalyst bed during the converter mode supports dissociation of oxides of nitrogen, and air injected between the catalyst beds provides an oxidizing atmosphere to support oxidization of hydrocarbons and carbon monoxide in the second catalyst bed. At high speeds or temperatures, a reactor mode is entered in which air injected at the exhaust ports supports oxidation of hydrocarbons and carbon monoxide in the exhaust manifolds and the exhaust gases then are discharged from the exhaust manifolds directly to the exhaust pipes to protect the catalyst beds.

37 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202327
202277
202160
2020146
2019173
2018159