Dielectric Waveguide for Uniform DPF Regeneration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas purifiers with diesel particulate filters (DPFs) face challenges in achieving uniform microwave intensity distribution, leading to temperature differences and incomplete regeneration due to particulate matter deposition on the downstream side of the flow direction, resulting in uneven particulate removal.
Innovation Solution
A particulate filter design incorporating a dielectric waveguide with higher effective relative permittivity than the particulate capturing body, positioned around the DPF, particularly at the downstream end, to enhance microwave intensity and temperature distribution, ensuring efficient particulate removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diesel particulate filter is used to capture particulates, then particulate removal is achieved, but uneven temperature distribution and incomplete regeneration occur due to non-uniform microwave intensity
Solution Approach 1:
The patent introduces a dielectric waveguide with higher effective relative permittivity than the particulate capturing body, positioned at the downstream end where particulates accumulate. This creates localized microwave concentration in the downstream region, ensuring uniform temperature distribution and complete regeneration throughout the filter, particularly in areas where particulates are most concentrated
2Productivity
If microwave heating is applied to regenerate the DPF, then particulate combustion is enabled, but uneven microwave intensity distribution causes inefficient particulate removal
Solution Approach 1:
The dielectric waveguide is strategically positioned at the downstream end of the particulate capturing body, creating localized microwave enhancement in the region where particulates are most densely deposited. This non-uniform distribution of the waveguide structure compensates for the natural microwave intensity gradient, ensuring efficient particulate combustion throughout the entire filter length
Solution Approach 2:
The dielectric waveguide acts as an intermediary structure that modifies microwave propagation characteristics. By introducing this intermediate dielectric element with higher permittivity, the patent controls and redistributes microwave energy to achieve uniform heating, thereby improving particulate removal efficiency without requiring changes to the microwave source or particulate capturing body
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 solution ensures uniform and increased microwave intensity at the downstream region, effectively accelerating the removal of particulates, thereby achieving complete regeneration of the DPF and efficient particulate filtration.
Implementation Method 1
a dielectric waveguide with higher effective relative permittivity than the particulate capturing body, positioned around the DPF
Implementation Method 2
the DPF is exposed to electromagnetic waves such as microwaves to heat and burn particulates such as PM deposited on the DPF
Implementation Method 3
exposed to electromagnetic waves such as microwaves to heat and burn particulates
Data Source
AI summary
A particulate filter includes a particulate capturing body configured to capture particulates contained in exhaust gas, and a dielectric waveguide provided around the particulate capturing body. The effective relative permittivity of the dielectric waveguide is higher than the effective relative permittivity of the particulate capturing body.