Honeycomb Filter Corner Trapping Layer Thickness Ratio
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Solution Overview
Problem
Honeycomb filters require prolonged regeneration treatment times to remove trapped particulate matter (PM), leading to residual PM and frequent regeneration treatments due to inefficient combustion removal.
Innovation Solution
A honeycomb filter design with polygonal cells and tailored trapping layers, where the corner trapping layer thickness is greater than the side trapping layer thickness, reducing PM deposition on corners and facilitating faster regeneration by controlling fluid flow and pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a trapping layer is used to remove PM, then PM removal efficiency is improved, but regeneration treatment time increases
Solution Approach 1:
The patent applies local quality by creating different trapping layer thicknesses in different locations: a corner trapping layer at the corners of the honeycomb cells and a side trapping layer on the sides. The corner trapping layer has a specific thickness ratio relationship with the side trapping layer, optimizing PM distribution and removal efficiency in different regions to reduce overall regeneration time while maintaining effective PM removal.
2Reliability
If corner trapping layer thickness is increased, then PM deposition on corners is reduced, but pressure loss may increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness ratio between the corner trapping layer and side trapping layer within the range of 0.9 to 1.5. This optimized parameter range reduces residual PM after regeneration while preventing excessive pressure loss, achieving a balance between filtration efficiency and flow resistance.
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 significantly reduces residual PM after regeneration, shortens regeneration treatment time, and maintains low pressure loss, improving filter efficiency and reducing the frequency and duration of regeneration treatments.
Implementation Method 1
a trapping layer for trapping and removing solid components contained in the fluid
Implementation Method 2
regeneration treatment to remove trapped PM by combustion
Data Source
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AI summary
A honeycomb filter 20 includes a cell 23 that is open at one end and closed at the other end and serves as a fluid flow path and a cell 23 that is closed at one end and open at the other end alternately disposed. The honeycomb filter 20 includes a side trapping layer 24a, which is disposed on each of side partitions 22a forming the sides of the polygonal cells 23, and a corner trapping layer 24b, which is disposed on each of corner partitions 22b forming the corners of the polygonal cells. The trapping layer thickness ratio Y/X of the thickness Y of the corner trapping layer 24b to the thickness X of the side trapping layer 24a is 1.1 or more and 2.4 or less. The corner trapping layer 24b has a larger thickness than the side trapping layer 24a. Thus, the side trapping layer 24a can more easily trap solid components.