Honeycomb Filter Cell Geometry for Low Pressure Loss Regeneration
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Solution Overview
Problem
Existing honeycomb filters face challenges in maintaining high regeneration efficiency during continuous regeneration while minimizing pressure loss due to ash deposition, with conventional methods like thinning the partition wall being insufficient in terms of strength and heat capacity.
Innovation Solution
A honeycomb filter design with specific cell and partition wall configurations, including cell density of 49 to 70 cells/cm², partition wall thickness of 0.152 mm or more, and a ratio of opening diameters of inflow and outflow cells between 1.30 to 1.53, enhancing catalyst contact and reducing ash deposition effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the partition wall thickness is reduced to suppress pressure loss increase due to ash deposition, then pressure loss is reduced, but strength and heat capacity deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the cell density to a specific range (49 to 70 cells/cm²) and controlling the partition wall thickness within a precise range (0.152 mm or more). This balanced parameter selection allows the filter to achieve low pressure loss while maintaining sufficient structural strength and heat capacity for continuous regeneration operations.
2Ease of manufacture
If conventional honeycomb filter designs are used, then manufacturing is simple, but regeneration efficiency during continuous regeneration is insufficient
Solution Approach 1:
The patent improves regeneration efficiency by changing key parameters: cell density is optimized to 49-70 cells/cm² and the ratio of opening diameters is controlled at 1.30-1.53. These parameter changes enhance catalyst contact area and optimize exhaust gas flow distribution, significantly improving continuous regeneration efficiency while maintaining manufacturability through standard production processes.
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 improves regeneration efficiency and effectively suppresses the increase in pressure loss by optimizing the geometric surface area and enhancing catalyst contact and reducing the increase in pressure loss due to the deposition of ash, while maintaining structural integrity.
Implementation Method 1
NO in exhaust gas is converted into NO2 by an oxidation catalyst
Implementation Method 2
this is used as an oxidizing agent to continuously burn the soot deposited in the DPF
Implementation Method 3
PM such as soot deposited in the DPF is burned
Data Source
AI summary
A honeycomb filter includes a pillar-shaped honeycomb structure having a porous partition wall arranged to surround a plurality of cells and a plugging portion provided to plug either one end of the cell; wherein, in a section orthogonal to the extending direction of the cell of the honeycomb structure, the sectional shape of an inflow cell is octagonal or quadrangular, and the sectional shape of an outflow cell is quadrangular, except for the cell disposed in outermost circumference of the honeycomb structure, a cell density of the honeycomb structure is 49 to 70 cells/cm2, a thickness of the partition wall is 0.152 to 0.198 mm, an opening diameter L1 of the inflow cell is 1.16 to 1.40 mm, an opening diameter L2 of the outflow cell is 0.82 to 1.08 mm, and a ratio (L1/L2) of the opening diameter L1 to the opening diameter L2 is 1.30 to 1.53.