Exhaust Pipe Tilted Opening Prevents Urea Corrosion
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Solution Overview
Problem
Existing exhaust gas purification devices face issues with reduction agents adhering to and being retained in the exhaust pipe, leading to corrosion, particularly when urea solution is used as the reduction agent, due to limited vehicle body space and existing pipe configurations.
Innovation Solution
The design includes a second exhaust pipe section with a tilted side and a curve section to prevent retention of the reduction agent at the peripheral edges, ensuring efficient swirl flow and preventing corrosion by allowing the urea solution to be hydrolyzed and distributed effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rectangular aperture opening section is used in the exhaust pipe, then the structure is simple and easy to manufacture, but the reduction agent adheres to the peripheral edges and causes corrosion
Solution Approach 1:
The opening section is designed with at least one tilted side that extends in a direction tilted relative to the axis of the exhaust pipe, creating an asymmetric geometry that prevents reduction agent accumulation at peripheral edges while maintaining manufacturing simplicity
Solution Approach 2:
The tilted side configuration creates curved flow paths for the exhaust gas and reduction agent mixture, preventing direct contact and adherence at sharp corners, thereby eliminating corrosion-prone areas
2Object-affected harmful factors
If the exhaust pipe configuration is modified to prevent reduction agent retention, then corrosion is prevented, but the device complexity increases
Solution Approach 1:
The asymmetric tilted side design achieves corrosion prevention through geometric modification rather than adding separate components, maintaining system simplicity while eliminating the harmful effect
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 effectively prevents the reduction agent from adhering to the exhaust pipe edges, preventing corrosion and ensuring efficient delivery of the urea solution for NOx reduction and purification in the SCR catalyst.
Implementation Method 1
being connected a side section thereof being to the first exhaust pipe section so that the flow of the exhaust gas therein becomes a swirl flow
Implementation Method 2
the urea solution being changed to the ammonia
Data Source
AI summary
An exhaust gas purification device with a first exhaust pipe section for leading exhaust gas discharged from an engine, a second exhaust pipe section having in a side section on an upstream side thereof an opening section for introducing exhaust gas from the first exhaust pipe section, the second exhaust pipe section being connected at a side section thereof to the first exhaust pipe section so that flow of exhaust gas therein becomes a swirl flow and having provided on a downstream side thereof a post-processing device, and a reduction agent supply device provided at an upstream end of the second exhaust pipe section. The opening section is formed so as to include at least a first tilted side extending in a direction tilted relative to an axis of the second exhaust pipe section.