Integrated Exhaust Purification Casing with Bypass Path
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Solution Overview
Problem
Conventional exhaust gas purification systems for diesel engines face challenges in maintaining NOx catalyst efficiency due to clogging by soot and fine particles, and the need for separate bypass paths increases initial costs and installation complexity, especially in narrow engine rooms.
Innovation Solution
An integrated exhaust gas purification device with a purification casing that includes both a purification path and a bypass path, where the bypass path is incorporated within the casing, allowing for switching between paths based on NOx regulation requirements, and using a partition plate to warm the purification catalyst and reduce soot accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate bypass path is provided outside the purification casing, then exhaust gas can bypass the purification catalyst, but initial costs increase and installation space requirements increase
Solution Approach 1:
The bypass path is merged with the purification casing to form an integrated structure. The casing simultaneously serves as both the purification path container and the bypass path structure, eliminating the need for separate external bypass piping and reducing overall system complexity
Solution Approach 2:
The purification casing is designed to perform multiple functions: it contains the purification catalyst for NOx reduction while also providing an integrated bypass path for exhaust gas flow. This multi-functional design reduces the number of separate components needed in the system
2Ease of operation
If a separate bypass path is provided outside the purification casing, then exhaust gas can bypass the purification catalyst, but installation space in narrow engine rooms increases
Solution Approach 1:
The bypass path is merged with the purification casing to form an integrated structure. The casing simultaneously serves as both the purification path container and the bypass path structure, eliminating the need for separate external bypass piping and reducing overall system complexity
Solution Approach 2:
The bypass path is nested within the purification casing structure. By placing the bypass通道 inside or as part of the casing volume, the design utilizes the existing structural space rather than requiring additional external space, making it suitable for compact engine rooms
3Reliability
If the purification catalyst is continuously exposed to exhaust gas, then purification function is maintained, but catalyst life decreases due to clogging and sulfur damage
Solution Approach 1:
The system dynamically switches between purification path mode and bypass path mode based on operating conditions. The bypass path allows exhaust gas to flow without contacting the catalyst under certain conditions, reducing cumulative exposure to harmful substances while maintaining the ability to purify when needed
Solution Approach 2:
The bypass path enables exhaust gas to skip the purification catalyst entirely under specific operating conditions. This allows the system to avoid subjecting the catalyst to continuous exposure to high-temperature exhaust gas and contaminants, thereby extending catalyst life while maintaining purification capability when required
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 extends the life of the NOx catalyst, reduces running costs, and simplifies installation by minimizing space requirements, while ensuring efficient purification and maintaining catalyst activity without unnecessary reducing agent consumption.
Implementation Method 1
using a partition plate to warm the purification catalyst
Implementation Method 2
the urea water is hydrolyzed by heat of exhaust gas and ammonia is produced
Implementation Method 3
the ammonia exerts action on NOx as reducing agent, and NOx is dissolved into harmless nitrogen and water
Data Source
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AI summary
In an exhaust gas purification apparatus (27) provided in an exhaust gas path (25) of an engine (12), it is an object of the present invention to shorten a pipe length of a bypass path (29) bypassing a purification catalyst (62, 63) as short as possible, thereby reducing initial costs. The exhaust gas purification apparatus (27) of the invention of the present application includes a purification casing (61) in which at least the purification catalyst (62, 63) is accommodated. The purification catalyst (62, 63) purifies exhaust gas from the engine (12). The purification casing (61) is integrally provided with the bypass path (29) separately from the purification path (28) in which the purification catalyst (62, 63) exists. The bypass path (29) makes the exhaust gas bypasses the purification catalyst (62, 63) without passing through the purification catalyst (62, 63).