Overflow Pipe Mixer for Exhaust Gas Vaporization
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Solution Overview
Problem
Conventional mixer devices for introducing and distributing a liquid reductant into a gas flow, such as in exhaust gas engineering, face challenges in achieving complete vaporization and uniform distribution while minimizing counter-pressure and manufacturing costs.
Innovation Solution
A mixer device with a mixing chamber and an overflow pipe that incorporates a jacket surface for vaporization and swirl components to enhance liquid distribution, featuring an injector for axial or oblique injection and inflow openings to generate swirls, reducing counter-pressure and improving vaporization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mixer devices are used to distribute liquid in gas flow, then acceptable homogenization is achieved, but liquid distribution completeness and vaporization efficiency are insufficient
Solution Approach 1:
The injector is positioned inside the overflow pipe, with the spray cone directed into the pipe interior. This nested arrangement allows the liquid to be injected directly into the hot gas flow within the pipe, maximizing contact area and vaporization efficiency while maintaining compact structure.
Solution Approach 2:
The overflow pipe introduces a radial dimension to the liquid distribution by allowing liquid to be dispersed in all directions from the axial injection point. This three-dimensional distribution pattern improves homogenization compared to conventional linear or planar distributors.
2Productivity
If mixer devices are designed to improve liquid distribution and vaporization, then efficiency increases, but counter-pressure in exhaust gas flow increases
Solution Approach 1:
The hot exhaust gas flow itself serves as the heating medium for vaporizing the injected liquid. The system uses the thermal energy already present in the exhaust stream, eliminating the need for additional external heating devices that would increase counter-pressure and complexity.
Solution Approach 2:
The design utilizes the kinetic energy and flow dynamics of the exhaust gas to enhance liquid atomization and distribution. The high-velocity gas flow naturally atomizes the injected liquid and carries it through the mixing chamber, reducing the need for mechanical mixing components that would increase pressure loss.
3Ease of manufacture
If the spray cone is exposed to the mixing chamber, then liquid injection is simple, but unwanted dispersals of the spray cone occur
Solution Approach 1:
The injector is positioned inside the overflow pipe, with the spray cone directed into the pipe interior. This nested arrangement allows the liquid to be injected directly into the hot gas flow within the pipe, maximizing contact area and vaporization efficiency while maintaining compact structure.
Solution Approach 2:
The overflow pipe acts as an intermediary structure that contains and directs the spray cone. It provides a controlled environment for liquid injection and vaporization, preventing unwanted dispersal while maintaining injection simplicity through the axial injection design.
4Manufacturing precision
If mixer device complexity is increased to achieve better liquid distribution, then homogenization improves, but manufacturing cost and device complexity increase
Solution Approach 1:
The overflow pipe serves multiple functions simultaneously: it acts as a vaporization chamber, a distribution manifold, a flow guide, and a structural support. This multi-functionality achieves complex liquid distribution patterns without requiring multiple separate components, thereby reducing overall device complexity and manufacturing cost.
Solution Approach 2:
The hot exhaust gas flow itself serves as the heating medium for vaporizing the injected liquid. The system uses the thermal energy already present in the exhaust stream, eliminating the need for additional external heating devices that would increase counter-pressure and complexity.
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 mixer device achieves a highly uniform distribution of the liquid reductant with minimal counter-pressure, optimizing exhaust gas treatment by ensuring complete vaporization and efficient adaptation to nitrogen oxide levels in the exhaust gas.
Implementation Method 1
its surface is comparatively hot. Liquid drops impacting the hot surface are vaporized.
Implementation Method 2
Liquid drops impacting the hot surface are vaporized.
Implementation Method 3
The overflow pipe is configured such that two swirl components of opposite senses can be imparted onto the inflowing gas in the interior of said overflow pipe.
Implementation Method 4
two swirl components of opposite senses can be imparted onto the inflowing gas
Data Source
AI summary
A mixer device for introducing and distributing a liquid into a gas flow comprises a mixing chamber which can be flowed through by the gas flow, an overflow pipe which is arranged at least partly in the mixing chamber and which has a jacket surface and a first and a second pipe end, and at least one injector associated with the first pipe end of the overflow pipe to inject the liquid into the overflow pipe. The jacket surface of the overflow pipe has at least one inflow opening through which gas can flow from the mixing chamber into the overflow pipe for a subsequent mixing with the injected fluid. The overflow pipe is configured such that inflowing gas in its interior can have two swirl components of opposite senses imparted onto it.