Integrated Catalyst Housing with Bypass Conduit
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Solution Overview
Problem
Existing exhaust gas aftertreatment systems for stationary internal combustion engines with separate bypass conduits are structurally complex and expensive, and the bypassed exhaust gas does not contribute to heating the catalyst units, leading to inefficient emission control.
Innovation Solution
Integrating the catalyst unit and bypass conduit into a common housing with separate feed conduits for untreated exhaust gas and an outlet conduit for treated gas, allowing for compact design and utilizing valves for open-loop or closed-loop control of bypassed exhaust gas, which also heats the catalyst units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate bypass conduit is used to pass exhaust gas around the catalyst unit, then the structural configuration is complicated and expensive, but the exhaust gas can be bypassed to protect the catalyst unit from harmful emissions
Solution Approach 1:
The patent combines the bypass conduit with the catalyst unit housing into a single integrated structure. The housing contains both the catalyst unit and the bypass conduit, allowing exhaust gas to be directed around the catalyst unit through an integrated path within the same housing structure. This merging eliminates the need for separate external bypass piping, reducing structural complexity while maintaining the protective bypass function.
2Reliability
If a separate bypass conduit is used to pass exhaust gas around the catalyst unit, then the structural configuration is complicated and expensive, but the exhaust gas bypass can be implemented
Solution Approach 1:
The housing serves dual purposes: it encloses the catalyst unit and simultaneously provides the bypass conduit structure. This integration means that a single housing component performs multiple functions, reducing the total number of parts that need to be manufactured and assembled. The bypass path is formed as an integral part of the housing design, simplifying manufacturing processes and reducing costs.
3Reliability
If exhaust gas is passed around the catalyst unit by a separate bypass conduit, then the catalyst unit can be protected from harmful emissions, but the bypassed exhaust gas does not contribute to heating the catalyst unit
Solution Approach 1:
The housing acts as an intermediary structure that facilitates thermal energy transfer from the bypassed exhaust gas to the catalyst unit. The housing is designed to conduct heat from the hot bypass gas to the catalyst unit, enabling thermal coupling between the two streams without requiring them to mix. This allows the bypassed exhaust gas to serve dual purposes: protecting the catalyst from harmful emissions while simultaneously heating it to operational temperature.
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 results in a compact, cost-effective exhaust gas aftertreatment apparatus where bypassed exhaust gas contributes to catalyst unit heating, enhancing emission control and system integration.
Implementation Method 1
the exhaust gases which are passed through the bypass conduit contribute to heating the at least one catalyst unit
Data Source
AI summary
An exhaust gas aftertreatment apparatus for an internal combustion engine, in particular a stationary internal combustion engine having at least one catalyst unit for exhaust gases, which is arranged downstream of the internal combustion engine. Exhaust gases from the internal combustion engine can be taken past the at least one catalyst unit by way of a bypass conduit, and the at least one catalyst unit and the bypass conduit are arranged in a common housing. The housing has at least two separate feed conduits for untreated exhaust gas and at least one outlet conduit for exhaust gas treated by the at least one catalyst unit.