Parallel SCR Filter-Catalyst Layout for Compact Exhaust Packaging
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Solution Overview
Problem
The conventional SCR system requires an injector for injecting an aqueous urea solution to be located in the axial direction of a filter, increasing the device's dimension.
Innovation Solution
The exhaust purification device includes a filter for collecting particulate matter, a contact device for bringing exhaust gas into contact with a reducing agent, and a catalyst arranged in parallel with the filter, with the contact device located in the axial direction to promote a reaction between the reducing agent and nitrogen oxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the injector is located in the axial direction of the filter, then the nitrogen oxide reduction function is achieved, but the device dimension increases
Solution Approach 1:
The patent transitions from a conventional axial arrangement where the injector is positioned in the axial direction of the filter to a parallel arrangement where the catalyst and filter extend in the same axial direction but are positioned side-by-side. This dimensional reconfiguration allows the contact device to be located axially with respect to the catalyst rather than the filter, achieving compact integration while maintaining the nitrogen oxide reduction function through proper spatial relationship between components
2Reliability
If the filter and catalyst are arranged in series axially, then the nitrogen oxide reduction is effective, but the device becomes complex and maintenance is difficult
Solution Approach 1:
The patent segments the exhaust purification system into distinct functional modules: a filter for particulate matter collection and a catalyst for nitrogen oxide reduction, with the contact device as a separate injection mechanism. This modular segmentation allows each component to perform its specific function independently while being integrated in a compact parallel arrangement, simplifying the overall device structure and facilitating easier maintenance compared to series axial arrangements
Solution Approach 2:
The patent merges the filter and catalyst into a compact integrated structure where both components extend in the same axial direction and are positioned parallel to each other, with the contact device integrating the injection function. This merging approach reduces the overall device footprint and complexity while maintaining effective nitrogen oxide reduction through the coordinated arrangement of all components
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
This configuration allows for a compact exhaust purification device design that simplifies the replacement of the filter and reduces the risk of leakage during maintenance, while maintaining efficient nitrogen oxide reduction.
Implementation Method 1
a catalyst extending in an axial direction and arranged in parallel with the filter, the catalyst being configured to promote a reaction between the reducing agent and nitrogen oxides in the exhaust gas discharged from the contact device
Data Source
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AI summary
An exhaust purification device includes a filter configured to collect particulate matter in exhaust gas discharged from an internal combustion engine; a contact device configured to bring the exhaust gas discharged from the filter into contact with a reducing agent; and a catalyst extending in an axial direction and arranged in parallel with the filter, the catalyst being configured to promote a reaction between the reducing agent and nitrogen oxides in the exhaust gas discharged from the contact device, the contact device being located in the axial direction with respect to the catalyst.