Exhaust Gas Aftertreatment Flow Divider Balancing
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Solution Overview
Problem
Existing exhaust gas aftertreatment systems for internal combustion engines face challenges in reducing emissions and optimizing performance due to unequal pressure distribution across catalyst members, leading to undesirable engine performance and increased backpressure.
Innovation Solution
The system incorporates a housing assembly with a flow divider that balances the exhaust gas flow between two catalyst members by adjusting the total area of apertures in the flow divider, ensuring equal pressure distribution and mitigating backpressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If exhaust gas is provided to two catalyst members in parallel to reduce emissions, then emission reduction performance is improved, but unequal pressure distribution occurs across catalyst members leading to increased backpressure
Solution Approach 1:
The flow divider introduces non-uniform aperture distribution with different aperture sizes and/or positions to create localized flow resistance variations. This compensates for the inherent pressure inequalities in parallel catalyst pathways, enabling balanced pressure distribution across catalyst members while maintaining high emission reduction efficiency
Solution Approach 2:
The flow divider modifies flow distribution parameters by varying aperture dimensions and positions to adjust local flow resistance. This parameter optimization balances the pressure distribution across parallel catalyst members, reducing backpressure while maintaining effective emission treatment
2Object-generated harmful factors
If exhaust gas is provided to two catalyst members in parallel to reduce emissions, then emission reduction performance is improved, but unequal pressure distribution occurs leading to undesirable engine performance
Solution Approach 1:
The flow divider creates localized flow resistance variations through non-uniform aperture distribution, balancing pressure across catalyst members. This ensures uniform exhaust gas treatment efficiency and maintains optimal engine performance by preventing pressure-induced performance degradation
3Productivity
If catalyst members are positioned to handle exhaust gas flow, then emission treatment capacity is improved, but space claim constraints result in unequal pressure distribution
Solution Approach 1:
The flow divider compensates for pressure inequalities caused by space-constrained catalyst positioning through localized aperture design. This enables effective emission treatment capacity while maintaining balanced pressure distribution despite limited installation space
Solution Approach 2:
The flow divider introduces a new design dimension (aperture geometry and distribution) to control pressure distribution. This additional degree of freedom allows optimization of pressure balance independent of catalyst member positioning constraints
Data Source
AI summary
An exhaust gas aftertreatment system includes a housing assembly, a first catalyst member, and a second catalyst member. The housing assembly includes an upstream housing, a decomposition housing, a distributing housing, and a catalyst member housing. The upstream housing is centered on an upstream housing axis. The decomposition housing is coupled to the upstream housing and configured to receive exhaust gas from the upstream housing. The distributing housing is coupled to the decomposition housing and configured to receive the exhaust gas from the decomposition housing. The catalyst member housing is coupled to the distributing housing and configured to receive the exhaust gas from the distributing housing. The catalyst member housing is centered on a catalyst member housing axis that is parallel to the upstream housing axis. The first catalyst member extends within the catalyst member housing.