In order to suppress deposition of constituent of a reducing agent (dissolved matter) in an exhaust passage of an engine enhancing an elimination rate of NOx even when temperature of an exhaust emission from the engine is low, an exhaust emission purifying apparatus is provided with an electro-generative-heat carrier provided on an upstream side of an injection nozzle that supplies the reducing agent into the exhaust emission on upstream side of a reduction catalyst in an exhaust pipe, the exhaust emission being heated to a temperature equal to or higher than a melting point of the dissolved matter whereby deposition of the dissolved matter on an inner wall surface of the exhaust pipe is suppressed to effectively use the supplied reducing agent for catalytic reduction reaction, even when the exhaust emission temperature is lower than the melting point of the dissolved matter of the reducing agent.

Exhaust emission purifying apparatus for engine

A method and apparatus to reduce the emissions of an exhaust stream is provided. One feature of the present invention includes a control unit for metering a reagent into the exhaust stream. The control unit adjusts a quantity of the reagent to be metered into the exhaust stream. One embodiment of the present invention concerns a method of removing nitrogen oxides in exhaust gases from a diesel engine by introducing ammonia into the exhaust stream. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Emission control system

To provide an engine exhaust gas treatment system that can
efficiently reduce and remove NOx using easy-to-handle urea as the
reducing agent, regardless of the engine operating conditions. An
exhaust gas denitration system in which an exhaust gas is introduced into
the denitration catalyst reactor (5) provided in the exhaust gas flue (3),
where NOx is reduced and removed in the presence of the denitration
catalyst, wherein a diversion means provided in the exhaust gas flue (3)
introduces a part or all of the exhaust gas into a urea solution injection
evaporator having a heating means by the heater (30), and the heat from
the exhaust gas and the heat from the heater serve to generate ammonia
that is then circled and mixed with the exhaust gas and introduced into
the denitration catalyst reactor (5).

Engine exhaust gas treatment system and exhaust gas treatment process

An exhaust mixer (16) is provided for use in an engine exhaust system (10) downstream from an additive injector (14). The mixer (16) includes eight vanes (20), with four of the vanes (20A) extending from a first side (22) of the mixer (16) and arranged in an equally spaced circumferential array around a central axis (24), and the other four of the vanes (20B) extending from an opposite side (26) of the mixer (16) and arranged opposite from the other four vanes (20A) in an equally spaced circumferential array.

Exhaust Gas Additive/Treatment System and Mixer for Use Therein

An exhaust aftertreatment device (10) includes an aftertreatment element (24) for treating internal combustion engine exhaust, an injector (26) for injecting chemical species mixing with the exhaust prior to reaching the aftertreatment element, and a turbulator (36) turbulating the exhaust to enhance the noted mixing. In a desired combination, a two-stage integrated perforated tube combination structure includes a turbulent mixing tube (38) disposed in an acoustic tube (40) and concentrically surrounded thereby.

Exhaust aftertreatment device, including chemical mixing and acoustic effects

An injection device for a reducing agent, a mixing device and a catalyst device are provided in an exhaust pipe. The mixing device is disposed upstream of the injection device as seen in the direction of flow of the exhaust gas. An exhaust gas inlet pipe is connected to the exhaust pipe along the main axis of the exhaust pipe. A first level of the catalyst device may advantageously be a hydrolysis-catalyst module, while the other levels may be SCR catalyst modules.

Exhaust emission control system for the exhaust gas of a diesel engine

In einem Abgasrohr (2) sind eine Eindus-Einrichtung (6) fur ein Reduktionsmittel (r), eine Mischeinrichtung (4) und eine Katalysator-Einrichtung (10) angeordnet. Dabei ist die Misch-Einrichtung (4) - in Stromungsrichtung des Abgases (A) gesehen - vor der Eindus-Einrichtung (6) angeordnet. Erfindungsgemas ist ein Eingangsabgasrohr (1) entlang der Hauptachse des Abgasrohrs (2) an das Abgasrohr (2) angeschlossen. Die erste Ebene (I) der Katalysator-Einrichtung (10) kann hierbei als Hydrolyse-Katalysator-Modul (22) ausgebildet sein, wahrend die weiteren Ebenen (II, III) als SCR-Katalysator-Module (12) ausgebildet sind.

Abgasreinigungsanlage für das abgas eines dieselmotors

An injection device (6) for a reducing agent, a mixer (4) and a catalyst device (10) are arranged in an exhaust pipe (2). The mixer (4) is located in front of the injection device (6) when seen from the direction of flow of the exhaust gas (A). According to the invention, an exhaust gas inlet pipe (1) is attached to the exhaust pipe (2) along the main axis of the exhaust pipe (2). The first plane (I) of the catalyst device (10) can be configured as a hydrolysis-catalyst module (22), whereas the other planes (II, III) can be configured as SCR catalyst modules (12).

Schnapp Steffen

Papers

Exhaust emission control system for the exhaust gas of a diesel engine

Abgasreinigungsanlage für das abgas eines dieselmotors

Exhaust gas control system for diesel engine exhaust gases