Segmented Heat Shield for Exhaust Emissions Cleaning Module
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Solution Overview
Problem
Current emissions cleaning technologies for internal combustion engines are inadequate in effectively treating exhaust gases, particularly in reducing hydrocarbons, carbon monoxide, and nitrogen oxides, as they often require additional modules and reagents like urea, which can lead to inefficiencies and increased complexity.
Innovation Solution
The emissions cleaning module incorporates a diesel oxidation catalyst (DOC) module, a selective catalytic reduction (SCR) module, and an ammonia oxidation (AMOX) module, along with a heat shield design that envelops all external surfaces, including a flowhood and downstream conduit, to optimize the treatment of exhaust gases and maintain temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat shield is provided to envelop the post-treatment assembly, then thermal emissions are reduced and temperatures are maintained, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The heat shield is divided into a first section and a second section that are coupled together to form half shells. This segmentation allows for easier manufacturing, assembly, and installation while still providing complete thermal protection of the flowhood and downstream conduit.
Solution Approach 2:
The heat shield is designed to substantially fully envelop the flowhood, with the first and second sections forming a nested structure that conforms to the external surfaces of the flowhood. This nested configuration maximizes thermal protection while minimizing material usage.
2Reliability
If additional modules and reagents are added to treat exhaust gases, then emissions treatment effectiveness improves, but the device complexity and operational complexity increase
Solution Approach 1:
The DOC module, SCR module, and AMOX module are integrated into a single emissions cleaning module with unified housing and common exhaust flow path. This merging reduces the number of separate components and simplifies installation while maintaining comprehensive emissions treatment capabilities.
Solution Approach 2:
The emissions cleaning module is designed to perform multiple functions within a single integrated system: hydrocarbon oxidation (DOC), nitrogen oxide reduction (SCR), and ammonia oxidation (AMOX). This multi-functionality eliminates the need for separate treatment modules while achieving comprehensive emissions control.
3Loss of energy
If the heat shield envelops all external surfaces including flowhood and downstream conduit, then thermal efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The heat shield is segmented into two sections forming half shells that can be manufactured separately with standard tolerances and then assembled. This segmentation reduces the cumulative precision requirements compared to manufacturing a single monolithic heat shield while still achieving complete surface coverage.
Solution Approach 2:
The first and second sections are designed as asymmetric half shells that conform to the specific geometry of the flowhood. This asymmetric design allows each section to be optimized for its specific location and assembly requirements, simplifying manufacturing while ensuring precise fit when coupled together.
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
This configuration enhances the conversion of exhaust gases into carbon dioxide, nitrogen, and water, improving emissions treatment efficiency while reducing thermal emissions and maintaining elevated temperatures within the module.
Implementation Method 1
an oxidation device, such as a diesel oxidation catalyst (DOC) module, to reduce or to eliminate hydrocarbons (HC) and/or carbon monoxide (CO). Oxidation devices generally include a catalyst to convert those substances into carbon dioxide and water.
Implementation Method 2
it is known to reduce or eliminate mono-nitrogen oxides (NO X ) in diesel combustion emissions by conversion to diatomic nitrogen (N 2 ) and water (H 2 O) by catalytic reaction with reductant chemicals such as ammonia (NH 3 ) entrained in the exhaust gas.
Implementation Method 3
a heat shield comprising a first section and a second section that are coupled together such that the heat shield substantially fully envelops all external surfaces of the flowhood
Data Source
Figure 1
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Figure 3
AI summary
An emissions cleaning module (1) including a heat shield (7) that comprises a first section (70) and a second section (71) that are coupled together around a flowhood (5). The heat shield substantially fully envelops all external surfaces of the flowhood.