Combustion Chamber Aperture Alignment for Flame Stability
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Solution Overview
Problem
Existing premixed combustion burners suffer from poor flame stability, backfire, deflagration, and clogging due to fine woven mesh, leading to high NOx emissions, especially at low excess air conditions.
Innovation Solution
A combustion chamber structure featuring a grate and flame retention structure with elongated components arranged along an axial direction, creating apertures that generate a negative pressure zone to prevent backfire and stabilize flames, while channels for cooling media help control temperature and reduce NOx emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fine woven mesh is used in premixed burners, then combustion efficiency is improved, but clogging occurs and flame stability deteriorates
Solution Approach 1:
The patent removes the fine woven mesh from the burner structure entirely, replacing it with a mesh-free design that uses a combustion chamber with specific geometric features (conical surface, aperture arrangement) to achieve both efficient combustion and stable flame without the clogging and stability issues caused by fine mesh
Solution Approach 2:
The patent changes the structural parameters of the combustion system by transitioning from a mesh-based flame holding structure to a geometrically-defined combustion chamber with specific aperture sizes and conical surface angles, fundamentally altering how the system maintains flame stability while avoiding mesh-related problems
2Productivity
If premixed combustion is used, then combustion efficiency is improved, but NOx emissions increase at low excess air
Solution Approach 1:
The patent creates different flow and temperature zones within the combustion chamber through the conical surface geometry and strategically positioned apertures, establishing local regions with different oxygen concentrations and flow velocities that promote efficient combustion in some areas while controlling temperature and reducing NOx formation in others
3Stability of the object's composition
If mesh structure is used for flame stabilization, then flame sits on surface, but backfire and deflagration occur
Solution Approach 1:
The patent introduces a combustion chamber with specific geometric features as an intermediary structure between the gas supply and the flame, using the chamber's conical surface and aperture arrangement to control flow patterns and pressure distribution, thereby stabilizing the flame without requiring mesh that could cause backfire
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 solution achieves stable combustion, reduces NOx emissions, and prevents clogging, enhancing combustion efficiency and flame stability by aligning apertures and using cooling media to manage flame temperature.
Implementation Method 1
The second set of elongated components can be configured to generate a negative pressure zone within the combustion chamber
Implementation Method 2
channels for cooling media help control temperature and reduce NOx emissions
Implementation Method 3
combustion chamber structure... achieve stable combustion
Data Source
AI summary
Embodiments provide a combustion structure that can achieve stable combustion by addressing the aforementioned drawbacks in the prior art such as low flame stability, backfire, deflagration, blockage and/or any other drawbacks. The combustion chamber structure in accordance with the disclosure can include: a grate structure including a first set of elongated components, a fire retention structure including a second set of elongated components. The first set of first elongated components can be arranged along an axial direction within the combustion chamber structure. The second set of elongated components can be arranged along the axial direction in a same direction as the first elongated components. The second set of elongated components can be configured to generate a negative pressure zone within the combustion chamber. The first set of elongated components can form apertures that can be aligned with apertures formed by the second set of elongated components.