Gas Burner Baffle and Deflector for Noise Reduction
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Solution Overview
Problem
Existing gas burner units for heat exchangers generate substantial noise due to uneven fuel mix flow, which existing noise suppression methods have not adequately addressed.
Innovation Solution
A gas burner unit design featuring a transverse baffle with a pyramidal or truncated pyramidal shape and a conical air and fuel mix deflector, which divides the air and fuel duct into segments and directs the mix evenly through holes in the baffle to the perforated burner wall, ensuring a steady flame and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional perforated burner wall with air and fuel duct is used, then the burner structure is simple, but substantial noise is generated due to uneven fuel mix flow
Solution Approach 1:
The air and fuel duct is segmented by introducing a transverse baffle that divides the duct into multiple sections. This segmentation allows different regions of the duct to supply mixed gas to different regions of the burner wall, creating multiple flow paths that balance the overall flow distribution and reduce noise generation.
Solution Approach 2:
The baffle structure is designed with varying local properties - it has through-holes in certain regions and solid portions in other regions. This local differentiation allows the baffle to redirect flow specifically in areas where uneven distribution occurs, creating more uniform fuel mix flow across the burner surface while maintaining structural integrity.
2Object-affected harmful factors
If a flat baffle with holes is used to suppress noise, then noise is reduced, but the fuel mix flow remains uneven and flame stability is compromised
Solution Approach 1:
The baffle is designed with a curved upper surface that follows the contour of the combustion chamber. This curvature allows the baffle to smoothly redirect the fuel mix flow along the chamber walls, promoting even distribution across the burner surface while maintaining flow stability and preventing turbulence that would compromise flame stability.
Solution Approach 2:
The transverse baffle acts as an intermediary element between the air and fuel duct and the burner wall. It mediates the flow by redistributing the fuel mix through its strategically positioned holes and solid sections, ensuring both noise suppression and uniform flow distribution to the burner surface.
3Stability of the object's composition
If the baffle cross section increases towards the perforated wall, then flow distribution improves, but the duct segment volume within the baffle increases excessively
Solution Approach 1:
Instead of increasing the baffle cross-section in the conventional horizontal direction (which would increase volume), the design extends the baffle vertically along the combustion chamber walls. This dimensional change allows the baffle to influence flow distribution across the entire burner surface area without proportionally increasing the volume occupied within the duct segment.
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 design achieves a substantial reduction in noise generated by the burner unit by ensuring a steady and even fuel mix flow, resulting in a more stable and quieter operation.
Implementation Method 1
The baffle 3 divides the air and fuel duct 2 into two segments: the segment under the baffle 3 and the one over the baffle 3
Implementation Method 2
The baffle 3 features round or square holes 4 through which the air and fuel mix is supplied to the perforated wall 1 of the burner
Implementation Method 3
Fixed to the wall of the air and fuel duct over the baffle 3 is the air and fuel mix deflector 7 given the conical shape
Implementation Method 4
The shape of the baffle 3 and the deflector 7 and their positioning towards each other in the air and fuel duct 2 according to the invention ensures substantial reduction of noise accompanying the work of the burner unit
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
A gas burner unit intended for a heat exchanger incorporates a perforated burner wall (1) and an air and fuel duct (2). In the air and fuel duct (2), over the perforated burner wall (1), there is a transverse baffle (3) featuring holes (4) and dividing the air and fuel duct (3) into two segments: before and after the said baffle, where the baffle is shaped so that the cross section of the segment of the air and fuel duct (2), located between the baffle (3) and perforated burner wall (1), increases along the baffle (3) towards the perforated burner wall (1), and cross section of the segment of the air and fuel duct (2) located within the inner space delimited by the baffle (3) decreases towards the perforated burner wall (1), and where fixed to the wall of the air and fuel duct above the baffle (3) is a deflector (7) for the air and fuel mix, shaped so that its cross section decreases towards the perforated burner wall (1).