Particulate Filter Ash Loading for Low Backpressure Filtration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing particulate filters, such as diesel particulate filters (DPFs) and gasoline particulate filters (GPFs), face challenges in maintaining filtration efficiency over time due to the accumulation of particulates, which leads to increased backpressure and reduced compliance with stringent emission standards, necessitating regular cleaning or replacement.
Innovation Solution
A method involving the removal of accumulated particulates from filters and introduction of simulated ash into the inlet channels, followed by thermal treatment, to enhance filtration efficiency and restore the filter's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particulate filters are used to remove particulate matters from engine emissions, then filtration efficiency is improved, but backpressure increases over time due to particulate accumulation
Solution Approach 1:
The patent implements periodic regeneration cycles where accumulated particulates are thermally oxidized to restore filter performance. The system alternates between filtration mode and regeneration mode, using exhaust heat to burn off soot periodically, thereby maintaining low backpressure while preserving high filtration efficiency over extended operation periods.
Solution Approach 2:
The patent changes operational parameters by controlling temperature and oxygen concentration during regeneration cycles. By raising the filter temperature to ignition points of accumulated particulates and maintaining adequate oxygen levels, the system transforms the filter from a high-backpressure state to a restored low-backpressure state, dynamically adjusting parameters to resolve the contradiction between filtration efficiency and backpressure.
2Duration of action of stationary object
If particulate filters operate for extended periods to maintain emission compliance, then service life is extended, but filtration efficiency deteriorates due to particulate accumulation
Solution Approach 1:
The patent employs periodic regeneration cycles that restore filtration efficiency without requiring filter replacement. By systematically burning off accumulated particulates at scheduled intervals, the system maintains high filtration efficiency throughout the extended service life, preventing the deterioration that would otherwise occur from continuous particulate accumulation.
Solution Approach 2:
The patent enables the filter to regenerate itself using its own accumulated particulates as fuel and exhaust heat as the energy source. The system requires minimal external intervention, automatically initiating regeneration when particulate load reaches critical levels, thereby maintaining filtration efficiency autonomously throughout the service life and extending operational duration without external maintenance.
3Stress or pressure
If thermal regeneration is performed to remove accumulated particulates, then backpressure is reduced, but energy consumption increases
Solution Approach 1:
The patent utilizes the exhaust gas from the engine itself as the heat source for regeneration, converting waste thermal energy into useful regeneration energy. The accumulated particulates serve as fuel, and the exhaust heat provides the necessary temperature rise, creating a self-sustaining regeneration process that reduces backpressure without requiring significant additional energy input from external sources.
Solution Approach 2:
The patent converts the accumulated particulates, which represent a harmful backpressure problem, into a beneficial fuel source for regeneration. By igniting the accumulated soot, the system transforms the backpressure-inducing mass into an energy source that drives the regeneration process, simultaneously reducing backpressure and utilizing what would otherwise be waste material and energy.
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 method improves particulate number (PN) removal efficiency, ensuring compliance with stringent emission standards and extending the service life of the filters by maintaining optimal backpressure and filtration efficiency.
Implementation Method 1
Thermal regeneration of diesel particulate filters is typically employed, where the collected particulates are oxidized by oxygen and/or nitrogen dioxide to gaseous products, primarily to carbon dioxide.
Implementation Method 2
the collected particulates are oxidized by oxygen and/or nitrogen dioxide to gaseous products
Data Source
AI summary
The present invention provides a method for treating a used particulate filter, comprising: removing particulates from the particulate filter; and introducing simulated ash into inlet channels of the particulate filter after removing the particulates.