Exhaust Gas Treatment Device Flow Separation Reductant Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas treatment devices for internal combustion engines face issues with excessive deposits of reductants, particularly urea, which lead to increased surface load, cooling, and reduced metering rates, along with higher fuel consumption and potential for deposit formation.
Innovation Solution
The introduction of a second flow separation element in the exhaust gas treatment device divides the exhaust gas flow into multiple sub-flows, ensuring the reductant spray cone does not collide with the flow separation elements, allowing for a widespread distribution of the reductant and preventing deposits, while maintaining low surface load and efficient evaporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reductant is introduced into the exhaust gas conduit by forming a spray cone, then the denitrification efficiency is improved, but the spray cone may collide with flow separation elements causing excessive deposits
Solution Approach 1:
The exhaust gas flow is divided into multiple sub-flows by introducing a second flow separation element that splits the second partial conduit into three sub-conduits. This segmentation ensures the spray cone is distributed across multiple flow paths rather than concentrating on a single path, reducing the risk of collision with flow separation elements and minimizing deposit formation while maintaining denitrification efficiency
Solution Approach 2:
The flow separation elements act as intermediaries that guide and distribute the exhaust gas flow and spray cone. By positioning these elements to divide the flow into multiple paths, they mediate between the spray injection and the exhaust gas flow, preventing direct collision and excessive deposit formation on any single element
2Productivity
If the metering rate of reductant is increased, then the denitrification performance is improved, but the surface load and cooling increase leading to more deposits
Solution Approach 1:
By dividing the exhaust gas flow into multiple sub-flows through the second flow separation element, the spray cone is distributed across multiple flow paths. This allows higher overall metering rates to be achieved while the surface load on any individual flow path remains manageable, preventing excessive cooling and deposit formation
Solution Approach 2:
The patent transitions from a single partial conduit to multiple sub-conduits, adding a dimensional aspect to the flow distribution. This multi-dimensional flow paths arrangement allows the spray to be dispersed more effectively, reducing concentrated surface load while maintaining high overall metering rates
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 approach enables high metering rates of reductants with minimal deposit formation, low surface load, and reduced fuel consumption, ensuring effective denitrification and efficient operation of the exhaust gas treatment device.
Implementation Method 1
a first flow separation element, by means of which the exhaust gas conduit is divided into a first partial conduit and a second partial conduit... a second flow separation element, by means of which the second partial conduit is divided into a first sub-conduit, a second sub-conduit and a third sub-conduit
Implementation Method 2
ensuring the reductant spray cone does not collide with the flow separation elements, allowing for a widespread distribution of the reductant and preventing deposits, while maintaining low surface load and efficient evaporation
Data Source
AI summary
An exhaust gas treatment device includes an exhaust gas guide element which has an exhaust gas conduit. A first flow separation element is disposed in the exhaust gas conduit that divides the exhaust gas conduit into a first partial conduit and a second partial conduit. The first flow separation element has a first conduit area. A second flow separation element is disposed in the second partial conduit. The second flow separation element divides the second partial conduit into a first sub-conduit, a second sub-conduit, and a third sub-conduit. The second flow separation element has a second conduit area which is cylindrical or expands in a flow direction. The first conduit area of the first flow separation element expands along an injection direction of a reductant.