Removable Exhaust Heating Arrangement with Bypass Path
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Solution Overview
Problem
Existing exhaust aftertreatment systems face challenges in efficiently heating exhaust gases at low temperatures, leading to reduced performance and increased reductant usage, and the addition of electrical heating elements increases complexity and pressure drop.
Innovation Solution
An exhaust aftertreatment arrangement with a removable heating arrangement that includes an electrical heating element and two fluid pathways, allowing exhaust gases to bypass the heating element, thereby reducing pressure drop and enabling easy maintenance and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an electrical heating element is added to heat exhaust gases, then the heating efficiency is improved, but the device complexity increases
Solution Approach 1:
The heating arrangement is divided into a modular design with separate components: an electrical heating element, fluid pathways, and mounting structures. This segmentation allows the heating element to be independently replaced or maintained without dismantling the entire exhaust aftertreatment system, thereby improving temperature control while managing device complexity through modular architecture.
Solution Approach 2:
The heating arrangement is designed to serve multiple functions: heating exhaust gases, providing a mounting structure for the heating element, and offering a bypass pathway for exhaust flow. This multi-functionality reduces the need for additional separate components, improving heating efficiency while minimizing the increase in device complexity.
2Temperature
If an electrical heating element is added to heat exhaust gases, then the heating efficiency is improved, but the pressure drop increases
Solution Approach 1:
A bypass fluid pathway is introduced as an intermediary route that allows exhaust gases to flow around the heating element when heating is not required or when pressure drop becomes excessive. This mediator pathway decouples the heating function from the main exhaust flow path, enabling temperature control while minimizing pressure drop penalties.
Solution Approach 2:
The system incorporates a valve that can dynamically switch the exhaust flow between the heating pathway and the bypass pathway based on operating conditions. This dynamic control allows the system to optimize between heating efficiency and pressure drop by adjusting flow distribution in real-time, preventing excessive pressure buildup while maintaining heating capability when needed.
3Ease of repair
If the heating arrangement is made removable, then the ease of maintenance is improved, but the device complexity increases
Solution Approach 1:
The heating arrangement is designed as a self-contained modular unit with the heating element, fluid pathways, and mounting interfaces as integrated components. This segmentation allows the entire heating assembly to be removed and replaced as a single module, improving maintenance accessibility while managing complexity through standardized modular design that simplifies installation and removal procedures.
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 heats exhaust gases, reduces pressure drop, and simplifies maintenance by allowing the heating arrangement to be easily accessed and removed, improving the efficiency of exhaust gas emission reduction while minimizing system complexity.
Implementation Method 1
a heating arrangement for heating the exhaust gases, the heating arrangement being arranged upstream of the SCR catalyst and comprising an electrical heating element
Data Source
AI summary
An exhaust aftertreatment arrangement for cleaning exhaust gases includes a fluid channel for providing a fluid pathway for the exhaust gases, a selective catalyst reduction, SCR, catalyst, arranged in or downstream the fluid channel, a heating arrangement for heating the exhaust gases, the heating arrangement being arranged upstream of the SCR catalyst and comprising an electrical heating element, a first fluid pathway for guiding the exhaust gases to the electrical heating element, and a second fluid pathway for guiding the exhaust gases to bypass the electrical heating element, wherein the heating arrangement is removably arranged relative the fluid channel.