Insulating Mounting for Electrostatic Diesel Filter Creepage Control
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Solution Overview
Problem
In electrostatic filters for diesel engine exhausts, creepage currents occur between electrodes and the exhaust line due to deposited soot, leading to unwanted charging and reduced filter efficiency, which is difficult to prevent with existing designs.
Innovation Solution
A mounting system with electrodes and an electrically insulating disk that covers the electrical conductor on the inflow side, preventing soot deposition and increasing the creepage length, thereby reducing the likelihood of creepage currents, using a disk with passages for exhaust gas flow and an electrical conductor connected to the electrodes through an insulating material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electrical conductor is exposed to exhaust gas flow, then particle separation efficiency is improved, but creepage currents occur due to soot deposition leading to unwanted charging and reduced filter efficiency
Solution Approach 1:
An electrically insulating material is introduced as an intermediary between the electrical conductor and the exhaust gas flow. This insulating material prevents direct contact between the conductor and soot particles, thereby eliminating the harmful effect of soot deposition while maintaining the electrical conductor's function in generating the electric field for particle separation.
2Reliability
If the electrical conductor is covered with electrically insulating material, then creepage currents are reduced, but particle separation efficiency may be compromised
Solution Approach 1:
The electrically insulating material is applied selectively only to specific regions of the electrical conductor where it is most needed - namely, the regions prone to soot deposition and creepage current formation. This localized application maintains the conductor's electrical functionality while preventing harmful effects only where necessary.
3Stability of the object's composition
If multiple electrodes are distributed over the exhaust line cross section, then uniform electric field distribution is improved, but device complexity increases
Solution Approach 1:
The electrical conductor is divided into multiple segments or sections along its length, with each segment capable of being independently controlled or configured. This segmentation allows for the creation of a more uniform electric field distribution across the exhaust line cross-section while maintaining a manageable overall structure.
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 effectively minimizes creepage currents, allowing for longer intervals between soot regeneration and maintaining filter efficiency by ensuring soot particles are deposited on the insulating material rather than the electrical conductor, thus preventing unwanted charging and enhancing particle separation.
Implementation Method 1
A mounting (1) with at least one electrode (2) for generating electric fields in an exhaust line (3) is specified. The mounting (1) comprises a disk (4) made of an electrically insulating material
Implementation Method 2
an agglomeration of small soot particles to form larger soot particles and/or electrical charging of soot particles are effected through the provision of an electric field and/or a plasma
Implementation Method 3
it is possible in particular for corona discharges to be generated through which the particles flowing with the exhaust gas through the electric field are subjected to a unipolar charge
Implementation Method 4
Due to the charging, the particles travel, as a result of the electrostatic Coulomb forces, to the collector electrode
Data Source
AI summary
A mounting includes at least one electrode producing electric fields in an exhaust gas line, a disk of electrically insulating material having inflow and outflow sides and openings for exhaust gas, and at least one electrical conductor fastened to and/or in the disk. The electrical conductor is covered by the electrically insulating material at least on the inflow side and in electrical contact with the electrodes extending toward the outflow side. Since the electrical conductor is completely surrounded by insulating material during operation, an area that must be covered by a soot layer for a leakage current to develop is increased. The leakage length increases and one or more electrodes are in the exhaust gas at the same time. The soot particles deposited on the mounting and the exhaust gas line, need to be removed less often. An exhaust line device having at least one mounting is also provided.