System and method for controlling emissions in an engine

Abstract

A method (200) and system (100) for controlling emissions in an engine, includes establishing a desired first temperature at an inlet (116) of an ammonia slip catalyst assembly (115); and determining a second temperature associated with a temperature at the inlet of the ammonia slip catalyst assembly (115). If the second temperature is higher than the desired first temperature, then directing an air injector (135) to add air to the inlet (116) of the ammonia slip catalyst assembly (115).

Description

technical field [0001] The presently disclosed subject matter relates generally to controlling emissions in engines (e.g., internal combustion engines), and more particularly to methods and methods of controlling emissions using active control of the temperature at the inlet of an ammonia slip catalyst assembly (ASC). system. Background technique [0002] Environmental regulations require the use of catalysts to treat engine exhaust in order to reduce air pollution. Catalytic converters utilize two types of catalysts, reducing catalysts and oxidation catalysts. Catalytic converters include a ceramic structure coated with a metal catalyst incorporated within a housing. The catalytic converter provides a structure that exposes the maximum surface area of ​​the catalyst to the exhaust gas flow. [0003] Three-way catalyst assemblies (TWC) are used on stationary rich-burn engines to reduce emissions of nitrogen oxides (NOx), hydrocarbons (HC) and carbon monoxide (CO). Since ...

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Problems solved by technology

However, if the temperature at the ASC exceeds the catalyst operating range (400-510°C), the NH 3 Can be oxidized to NOx, which causes the system to exceed NOx regulations

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