Combustion chamber assembly unit for a vaporizing burner
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Solution Overview
Problem
Existing combustion chamber assembly units for vehicle heaters emit high levels of nitrogen oxides during combustion operations, which are harmful pollutants.
Innovation Solution
The combustion chamber assembly unit incorporates a design with a circumferential wall and bottom area defining a combustion chamber, featuring a first and second flame diaphragm with air admission openings between them, allowing for swirling admission of combustion air and exhaust gas recirculation, supported by an electrically energizable heating device and ignition element, to reduce nitrogen oxide emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air admission openings are provided in the circumferential wall between the porous evaporating medium and the first flame diaphragm, then combustion air supply is improved, but nitrogen oxide emissions increase due to high temperature combustion
Solution Approach 1:
The circumferential wall is segmented into multiple zones with different functions: an upper zone with air admission openings for combustion air supply, and a lower zone without openings to control exhaust gas recirculation. This spatial segmentation allows independent optimization of air supply and emission control functions.
Solution Approach 2:
Different regions of the combustion chamber are given different properties: the upper region admits fresh air for combustion, while the lower region allows exhaust gas recirculation. This local differentiation of flow characteristics enables reduced NOx emissions through controlled mixing zones while maintaining adequate combustion air supply.
2Object-generated harmful factors
If exhaust gas recirculation is implemented to reduce nitrogen oxide emissions, then harmful substance emissions are reduced, but combustion efficiency may be affected
Solution Approach 1:
The patent changes the parameters of the combustion process by introducing exhaust gas recirculation through the lower zone of the circumferential wall. This modifies the temperature and composition parameters of the combustion environment, reducing peak temperatures that form NOx while maintaining adequate oxygen supply through the upper zone openings for sustained combustion efficiency.
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 significantly lowers nitrogen oxide emissions by promoting efficient turbulent flow and mixing, while also reducing harmful substance emissions through controlled air admission and exhaust gas recirculation, achieving a more environmentally friendly combustion process.
Implementation Method 1
An electrically energizable heating device is provided at the bottom area for supporting the fuel evaporation from the porous evaporating medium
Implementation Method 2
fuel is admitted via a porous evaporating medium carried on an evaporating medium carrier of the bottom area
Implementation Method 3
An efficient turbulent flow can be provided by the air admission opening arrangement being configured for admitting air with a circumferential flow direction component
Implementation Method 4
By providing the air admission opening arrangement in an area of the circumferential wall, which is axially further downstream, i.e., lying at a distance from the porous evaporating medium, between the two flame diaphragms, the possibility is given to markedly lower the emission of nitrogen oxide (NOx) also by means of swirling admission of the combustion air in conjunction with exhaust gas recirculation generated in this area in the combustion process
Data Source
AI summary
A combustion chamber assembly unit, for a vaporizing burner, includes a combustion chamber housing with a circumferential wall extending in a direction of a combustion chamber housing longitudinal axis (L) and a bottom area (14), together defining a combustion chamber (16). The bottom area (14) includes an evaporating medium carrier (18) and on a side facing the combustion chamber (16), a porous evaporating medium (20). A first flame diaphragm (36), with a first diaphragm opening (38), is provided on the circumferential wall (12). A second flame diaphragm (40), with a second diaphragm opening (42), is provided at an axial distance to the first flame diaphragm (36) on an axial side facing away from the porous evaporating medium (20). An air admission opening arrangement (44) is provided in the circumferential wall (12) and includes an air admission opening (46) between the first flame diaphragm (36) and the second flame diaphragm (40).