Honeycomb Filter Plugging Lengths for Temperature Stability
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Solution Overview
Problem
Conventional honeycomb filters face challenges in maintaining consistent temperature and regeneration efficiency due to fluctuations in exhaust gas temperature, leading to intermittent catalyst action and inadequate soot removal.
Innovation Solution
A honeycomb filter design with a pillar-shaped substrate and distinct plugging lengths for inflow and outflow cells, where the inflow side plugging portions have a larger average length than the outflow side plugging portions, enhancing temperature-rising and heat-retaining properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the temperature of exhaust gas fluctuates, then the catalyst action becomes intermittent, but the regeneration efficiency deteriorates
Solution Approach 1:
The partition wall is designed with a thickness that provides sufficient heat capacity before the regeneration process begins. This preliminary thermal mass ensures that when exhaust gas temperature fluctuates, the partition wall can maintain the catalyst activation temperature, preventing intermittent catalyst action and ensuring continuous regeneration efficiency.
Solution Approach 2:
The invention optimizes the partition wall thickness parameter to achieve the right balance between heat capacity and pressure loss. By changing this physical parameter, the system maintains stable temperature conditions for catalyst operation even when exhaust gas temperature varies, thus ensuring both reliability of catalyst action and productivity of regeneration.
2Stability of the object's composition
If the partition wall thickness is increased to improve heat retention, then the temperature stability improves, but the pressure loss increases
Solution Approach 1:
The invention optimizes the partition wall thickness parameter to achieve the right balance between heat capacity and pressure loss. By changing this physical parameter, the system maintains stable temperature conditions while minimizing the impact on exhaust gas flow and pressure loss.
Solution Approach 2:
The partition wall is designed with specific thermal properties and thickness in the regions where catalyst activation is needed, providing localized heat retention. This allows temperature stability to be improved in critical areas without uniformly increasing thickness throughout the entire structure, thereby avoiding excessive pressure loss.
3Reliability
If the plugging portion length is increased to improve filtration, then the filtering performance improves, but the flow resistance increases
Solution Approach 1:
The plugging portions are designed with different lengths depending on the local requirements of each cell. By varying the plugging length locally rather than uniformly, the system achieves improved filtering performance in areas where it is most needed while minimizing the overall impact on exhaust gas flow and pressure loss.
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 design ensures efficient temperature management and continuous regeneration by maintaining high temperature in inflow cells, even during temperature fluctuations, thereby improving filtering performance and reducing pressure loss.
Implementation Method 1
the partition wall that defines two of the inflow cells (2a) by division... having excellent temperature-rising property of inflow cells (2a) and having excellent heat-retaining property of the inflow cells (2a)
Implementation Method 2
a honeycomb filter may be loaded with catalyst to burn the soot for removal... a reaction of the catalyst
Implementation Method 3
burn the soot for removal... high-temperature gas
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 LIN of the inflow side plugging portions disposed in the outflow cells of the honeycomb substrate is larger than an average of the plugging length LOUT of the outflow side plugging portions disposed in the inflow cells of the honeycomb substrate.