Premix Burner Hole Layout for Stable Opposed Flame Combustion
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Solution Overview
Problem
Existing premix burners face challenges with flame stability, particularly under unstable gas supply conditions, leading to flame lift and resonance issues, which can damage components and result in poor thermal performance.
Innovation Solution
A gas premix burner design featuring a main combustion hole upstream of an auxiliary combustion hole, where the auxiliary flame intersects the main flame, stabilizing the flame through opposed flames and preheating the mixed gas before combustion, thereby reducing flame lift and enhancing thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire mesh is used to cover the burner surface, then flame stability and turndown ratio are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The invention extracts the wire mesh layer from the burner structure and replaces it with a plate-type combustion surface having through-holes. This removes the manufacturing complexity associated with wire mesh while maintaining the flame stability function through the through-hole design that enables proper flame attachment and combustion.
Solution Approach 2:
The invention creates a simplified copy of the wire mesh burner's functionality using a plate structure with through-holes. Instead of using actual wire mesh, the patent replicates the flame-stabilizing effect through a different structural approach that is easier to manufacture while achieving similar combustion performance.
2Ease of manufacture
If simple circular or rectangular holes are used in plate type burners, then manufacturing simplicity and cost are improved, but flame stability deteriorates
Solution Approach 1:
The invention applies local quality by creating a curved combustion surface rather than a flat plate. This curvature locally modifies the flow patterns and flame attachment characteristics, improving flame stability while maintaining the manufacturing simplicity of a plate-type structure with through-holes.
Solution Approach 2:
The patent explicitly employs curvature in the combustion surface design. The curved surface modifies the gas flow and flame propagation characteristics, enabling stable flame attachment and preventing flame lift-off, thereby resolving the flame stability issue while keeping the manufacturing process simple.
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 improved flame stability and thermal loads by ensuring the auxiliary and main flames intersect, suppressing flame lift and maintaining stable combustion, even under varying gas flow conditions, thus enhancing the burner's performance and longevity.
Implementation Method 1
an auxiliary flame of the auxiliary combustion hole intersects a main flame of the main combustion hole
Implementation Method 2
preheating the mixed gas before combustion
Implementation Method 3
gas and air can be burned by the gas premix burner after mixed in the premix chamber
Data Source
AI summary
A gas premix burner and a gas water heater. The gas premix burner has a combustion direction, the gas premix burner can be matched and connected with a premix chamber that is disposed upstream the combustion direction of the gas premix burner, gas and air can be burned by the gas premix burner after mixed in the premix chamber; the gas premix burner comprising: a burner substrate, a main combustion hole provided on the burner substrate; an auxiliary combustion hole disposed downstream the main combustion hole along the combustion direction on the burner substrate; an auxiliary flame of the auxiliary combustion hole intersects a main flame of the main combustion hole. The present application provides the main combustion hole upstream the auxiliary combustion hole along the combustion direction, since the main flame is usually larger in scale than the auxiliary flame, by providing the main flame upstream the auxiliary flame, it will be easier for the auxiliary flame and the main flame to intersect each other, and then the effect of stabilizing the flame is realized by opposed flames formed by the auxiliary flame and the main flame.