Parallel Exhaust Manifold and Catalyst for Compact Diesel Aftertreatment
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Solution Overview
Problem
Conventional exhaust gas aftertreatment systems for large diesel engines, particularly two-stroke engines, face challenges in compact design and space efficiency, leading to increased engine size and potential insufficient pollutant reduction due to the need for large pipe and connection components, as well as difficulties in integrating catalytic converters within existing engine spaces.
Innovation Solution
A compact exhaust gas aftertreatment device featuring an elongate exhaust gas collector and catalyst container arranged essentially parallel to each other, separated by a partition wall with passages for directing exhaust gases through catalyst elements, and incorporating a diffuser for reducing agents, allowing for efficient pollutant reduction without increasing engine height or width, and enabling bypassing of the catalytic converter if needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard components are used for pipes and connections in conventional SCR devices, then the pollutant reduction effect is sufficient, but the space required increases significantly
Solution Approach 1:
The exhaust manifold and catalytic converter are merged into a single integrated unit. The catalytic converter is directly installed within the exhaust manifold structure, eliminating the need for separate pipe connections and reducing overall space requirements while maintaining effective pollutant reduction
Solution Approach 2:
The catalytic converter is nested within the exhaust manifold structure. The catalyst housing is positioned inside the manifold's exhaust gas flow path, allowing the catalytic converter to occupy space that would otherwise be unused or require additional external components
2Area of stationary object
If the catalytic converter is arranged in the exhaust manifold to save space, then the compactness is improved, but the exhaust manifold diameter increases making integration difficult
Solution Approach 1:
The exhaust manifold is designed with locally modified sections to accommodate the catalytic converter. Specific areas of the manifold are shaped or expanded only where the catalyst housing is installed, rather than increasing the overall manifold diameter uniformly, allowing integration within existing engine bay constraints
3Area of stationary object
If the exhaust gas collector and catalyst container are arranged parallel with partition walls, then the device compactness is improved, but the flow resistance may increase
Solution Approach 1:
Partition walls with strategically positioned openings act as intermediaries between the exhaust gas collector and catalyst container. These openings guide exhaust gas flow through the catalyst elements while the partition walls maintain structural separation and compact arrangement, balancing space efficiency with flow characteristics
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for effective exhaust gas treatment without increasing flow resistance, ensuring sufficient pollutant reduction while maintaining a compact design that fits within existing engine spaces, suitable for various engine sizes and configurations.
Implementation Method 1
The inlet connection (7a) can be effective as a jet pump (15) for the reducing agent, if a diffuser (15a) is formed on the outlet side of the inlet connection (7a)
Implementation Method 2
So-called selective catalytic reduction (SCR) is mainly used to reduce the nitrogen oxide content
Data Source
Figure 1
Figure 2~3
Figure 4~5B
AI summary
The device (10) has an elongated exhaust gas manifold (7) with inlets (7.1a, 7.1a', 7.1a'', 7.2a, 7.2a') for receiving exhaust gas from a large diesel engine. The exhaust gas manifold and a catalyst container (8) are arranged parallel to each other and separated from each other by a partition wall (9) extending along longitudinal direction. The exhaust gas manifold is connected with the catalyst container over passages (9.1a, 9.2a), which are provided in the partition wall, to guide the exhaust gas to an outlet during operation of the device by catalyst elements. Independent claims are also included for the following: (1) a large diesel engine (2) a method for exhaust gas aftertreatment for a large diesel engine.