Honeycomb Filter Plugging Length Optimization
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Solution Overview
Problem
Conventional honeycomb filters face issues with cracking during forced regeneration due to limited soot deposition capacity, leading to increased pressure loss and reduced filtering efficiency.
Innovation Solution
A honeycomb filter design with a pillar-shaped substrate featuring a porous partition wall, where the average plugging length of outflow side plugging portions is larger than that of inflow side plugging portions, enhancing temperature-rising properties and increasing the deposition limit of particulate matter like soot, thereby suppressing cracks and pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the honeycomb filter is regenerated by burning soot at one time, then the filtering performance is restored, but the temperature at the outflow end face increases excessively causing cracks
Solution Approach 1:
The honeycomb filter divides the cell array into multiple regions (first region with inflow side plugging portions, second region with outflow side plugging portions, third region with both types). This segmentation allows different zones to handle heat and soot deposition differently, preventing excessive temperature concentration at any single location during regeneration.
Solution Approach 2:
Different plugging portion configurations are applied to different regions of the honeycomb filter. The first region has inflow side plugging portions that prevent soot accumulation near the inflow end, the second region has outflow side plugging portions, and the third region has both. This local differentiation optimizes temperature distribution and prevents cracks during regeneration.
2Quantity of substance
If the deposition limit of soot is increased, then the regeneration intervals can be extended, but the temperature-rising property deteriorates
Solution Approach 1:
The cell array is segmented into multiple regions with different plugging configurations, allowing the filter to accumulate more soot overall while distributing the thermal load during regeneration across different zones, thus maintaining temperature-rising property while increasing deposition capacity.
Solution Approach 2:
Inflow side plugging portions are positioned to prevent soot from accumulating near the inflow end face before regeneration occurs. This preliminary arrangement ensures that during regeneration, the temperature rise is more uniform and prevents localized overheating, allowing greater soot deposition capacity to be achieved safely.
3Quantity of substance
If the plugging portions are positioned to maximize soot deposition, then the deposition limit increases, but cracks occur during forced regeneration
Solution Approach 1:
The honeycomb filter is divided into three regions with different plugging configurations: the first region has inflow side plugging portions, the second region has outflow side plugging portions, and the third region has both types. This segmentation allows the filter to maximize soot deposition in safe zones while preventing crack-prone accumulation patterns.
Solution Approach 2:
Different plugging strategies are applied locally to different regions. Inflow side plugging portions in the first region prevent soot accumulation near the inflow end, outflow side plugging portions in the second region manage soot distribution, and the combination in the third region optimizes both deposition and thermal management, preventing cracks during regeneration.
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 design effectively increases the deposition limit of soot during regeneration, reduces the likelihood of cracks, and maintains effective filtering performance by optimizing the plugging lengths and cell configurations.
Implementation Method 1
a porous partition wall that defines a plurality of cells extending from an inflow end face to an outflow end face
Implementation Method 2
PM, such as soot, is deposited inside of the honeycomb filter over time
Implementation Method 3
PM, such as soot, deposited inside of the honeycomb filter has to be burned with a high-temperature gas for removal
Implementation Method 4
the operation to burn the soot deposited inside of a honeycomb filter may be called simply 'regeneration' or 'regeneration operation'
Data Source
AI summary
A honeycomb filter includes a pillar-shaped honeycomb substrate including a porous partition wall that defines a plurality of cells extending from an inflow end face to an outflow end face, an inflow side plugging portion disposed at the inflow end face of the honeycomb substrate to plug open ends of outflow cells; and an outflow side plugging portion disposed at the outflow end face of the honeycomb substrate to plug open ends of inflow cells other than the outflow cells. The honeycomb substrate includes the partition wall that defines two of the inflow cells by division. An average of the plugging length LOUT of the outflow side plugging portions disposed in the inflow cells of the honeycomb substrate is larger than an average of the plugging length LIN of the inflow side plugging portions disposed in the outflow cells of the honeycomb substrate.