Cool Flame Combustion Membrane for Stable High Power
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Solution Overview
Problem
Existing combustion methods for homogeneous fuel-air mixtures in boilers face challenges in increasing power range without causing flame lift-off, leading to potential explosions, and struggle with noise and NOx emissions, particularly in condensing boilers where clear formation rules for noise-free and effective combustion are lacking.
Innovation Solution
The method involves creating a burner membrane with additional openings that cool the flame root, preventing direct heat radiation and amplification of vibration noises, allowing for increased fuel-air flow and stable flame re-ignition, and configuring orifices to prevent flame tearing-off and noise amplification, even at higher power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power range of a burner is increased by increasing fuel-air flow through a membrane, then higher power output is achieved, but flame lift-off occurs leading to potential explosions
Solution Approach 1:
The membrane is divided into two functional zones: a first region with a first opening pattern for stable flame anchoring, and a second region with a second opening pattern for controlled flame propagation. This segmentation allows different parts of the membrane to perform different functions, enabling increased power range while maintaining flame stability through the anchored flame roots in the first region.
Solution Approach 2:
Different opening patterns are applied to different regions of the membrane: the first region has openings configured to anchor flame roots and prevent lift-off, while the second region has openings optimized for flame propagation and power output. This local differentiation of properties allows the system to simultaneously achieve flame stability and high power range.
2Power
If additional openings are added to increase power range, then fuel-air flow is improved, but combustion noise and vibration amplification increase
Solution Approach 1:
The membrane openings are segmented into two distinct patterns: the first opening pattern in the first region is designed to minimize vibration and noise generation, while the second opening pattern in the second region optimizes for power output. This segmentation allows the system to achieve high power range while controlling combustion noise through the noise-minimizing first region.
3Productivity
If homogeneous fuel-air mixture is used for complete combustion, then combustion efficiency is improved, but flame propagation becomes unstable at high power levels
Solution Approach 1:
The combustion process is segmented into two zones: the first region with its specific opening pattern stabilizes flame propagation and prevents lift-off, while the second region with its opening pattern maintains complete combustion efficiency. This spatial segmentation of combustion functions allows homogeneous fuel-air mixture to achieve both complete combustion and stable flame propagation at high power levels.
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 effectively increases the permissible power range while maintaining low NOx emissions and reducing combustion noise, ensuring complete combustion and preventing flame lift-off, thus enhancing the operational safety and efficiency of boilers.
Implementation Method 1
cooling or chilling of the flame roots (7) of these additional flames (8) is achieved by means of the configuration of the orifices (16) of these additional openings (3)
Implementation Method 2
resonance vibrations that occur because of the configuration of the orifices of the additional openings are immediately reduced when they occur, by means of acoustical de-tuning
Implementation Method 3
cooling on the basis of the expansion effect is achieved at the orifices after the fuel/air mixture has passed through
Data Source
AI summary
A combustion method of a mixture composed of air and fuel uses a precious metal fiber membrane (1), wherein additional openings (3) for generation of a flame field with higher flames (8) are provided, the roots (7) of which are kept cool for NOx reduction, among other things.