Cylindrical Burner Flow Stabilization via Grid and Vanes
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Solution Overview
Problem
Existing cylindrical surface combustion gas burners face challenges in achieving uniform gas flow and pressure distribution over the combustion surface, leading to irregular flame heights and increased emissions of CO and CO2, particularly when the fan is positioned remotely or when internal casings are used to enhance pressure, which increases weight and cost.
Innovation Solution
A pressure and flow rate stabilizing device comprising a grid with a central ring and deflecting blades is positioned inside the burner inlet, dividing the gas flow into a central laminar stream and a cyclonic vortex stream, ensuring even pressure and flow distribution across the combustion surface without significant pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an internal perforated casing is added to increase pressure and improve flow uniformity, then the combustion uniformity is improved, but the weight and cost of the burner substantially increase
Solution Approach 1:
The burner is divided into two functional zones: an inner combustion chamber where fuel is burned, and an outer annular combustion chamber where secondary air is introduced. This segmentation allows each zone to perform its specific function optimally without requiring a heavy internal casing throughout the entire structure.
Solution Approach 2:
The solution moves from a radial pressure distribution problem to an axial dimension by introducing secondary air through the side wall of the outer chamber. This creates an annular combustion pattern that complements the central combustion, achieving uniformity without increasing weight.
2Stability of the object's composition
If an internal perforated casing is added to stabilize pressure distribution, then the flame height uniformity is improved, but the device complexity and cost increase
Solution Approach 1:
The combustion process is segmented into primary combustion in the inner chamber and secondary combustion in the outer annular chamber. This segmentation simplifies the pressure stabilization mechanism by using the annular chamber geometry and secondary air flow rather than a complex internal casing with multiple perforations.
Solution Approach 2:
The outer chamber serves multiple functions: it provides structural support, introduces secondary air for combustion, and creates the annular combustion pattern. This multi-functionality reduces the need for separate components, thereby reducing overall device complexity.
3Ease of operation
If an internal perforated casing is added to enhance pressure, then the gas flow distribution is improved, but the pressure drop in the gas flow increases significantly
Solution Approach 1:
Instead of trying to control pressure distribution through radial perforations in an internal casing, the solution introduces secondary air axially through the side wall of the outer chamber. This creates an annular flow pattern that naturally balances pressure distribution without significant pressure drop.
Solution Approach 2:
The system uses pneumatic principles by introducing secondary air flow through the outer chamber wall to create an annular combustion pattern. This pneumatic approach controls flow distribution through pressure differential and flow dynamics rather than mechanical perforation patterns, reducing energy loss.
4Adaptability or versatility
If the fan is positioned remotely from the burner inlet, then the installation flexibility is improved, but the gas flow uniformity at the combustion surface deteriorates
Solution Approach 1:
The outer chamber is designed with a specific geometry and secondary air introduction system that pre-condition the gas flow before it reaches the combustion surface. This preliminary structuring of the flow path ensures uniformity is achieved regardless of fan position, allowing installation flexibility.
Solution Approach 2:
The solution addresses the flow uniformity problem by adding the annular combustion dimension. The secondary air introduction through the outer chamber wall creates a flow pattern that compensates for irregularities introduced by remote fan positioning, restoring uniformity at the combustion surface.
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 device achieves a uniform flame height and optimal combustion hygiene by generating a constant gas flow and pressure distribution over the entire combustion surface, reducing emissions and maintaining low weight and cost.
Implementation Method 1
said deflecting blades generate a whirling movement of the peripheral part of this flow penetrating into the burner from the outside of the center ring
Implementation Method 2
this grid being so shaped that it allows the free passage of the central part of the flow of gaseous mixture penetrating into the burner through the central ring, while said deflecting blades generate a whirling movement of the peripheral part of this flow
Data Source
Figure 1~3
Figure 4~8
Figure 9~10
AI summary
The invention relates to a gas burner comprising a perforated cylindrical wall used as a combustion surface, a bottom wall and an inlet opening through which a combustible gaseous mixture is fed inside the burner. The stabilisation device consists of a grid (4a) that can be positioned in the inlet opening of the burner, and that comprises a central ring (5a) surrounded by a series of diverting vanes (6), the grid being thus configured so as to allow the free passage of the central portion of the flow of gaseous mixture entering the burner through the central ring (5a) while said diverting vanes (6) generate an eddy movement in the peripheral portion of the flow entering the burner from the outside of the central ring (5a).