Cross-Lighting Gas Burner Duct for Uniform Mixture Diffusion
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Solution Overview
Problem
Gas burners with cross-lighting ducts experience non-uniform diffusion of the primary air/gas mixture, leading to combustion issues, especially when fuel gas compositions change, and require complex modifications for optimal operation.
Innovation Solution
A gas burner design with a cross-lighting duct featuring a lower opening for secondary air inflow, which can be adjusted by a removable closing element to ensure stoichiometric conditions and adapt to different gas types and burner sizes, enhancing flame propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cross-lighting duct is disposed transversally inside the diffusion chamber to allow flame passage between flame spreaders, then the use of multiple spark plugs is avoided, but the diffusion of the primary air/gas mixture becomes non-uniform
Solution Approach 1:
The cross-lighting duct is segmented into multiple sections along its length, with each section having independently adjustable closing elements. This allows different regions of the duct to have different opening areas, enabling uniform mixture diffusion while maintaining the flame passage function.
Solution Approach 2:
Different sections of the cross-lighting duct are given different local characteristics through adjustable closing elements. Each section can be optimized for its specific function: some sections prioritize flame passage while others prioritize mixture diffusion, achieving both goals simultaneously.
2Stability of the object's composition
If the cross-lighting duct upper wall is disposed lower than the upper dome to allow mixture communication in the whole volume, then mixture diffusion is improved, but stoichiometric conditions cannot be guaranteed when gas composition changes
Solution Approach 1:
The closing elements are designed to be removable and adjustable, transforming the duct from a static structure to a dynamic one. This allows the opening area to be modified in response to changing gas compositions, maintaining stoichiometric conditions while preserving uniform mixture diffusion.
Solution Approach 2:
The opening area of the cross-lighting duct is made variable through adjustable closing elements. By changing the opening area parameter, the system can adapt to different gas compositions and burner sizes, ensuring proper stoichiometric conditions while maintaining uniform diffusion.
3Device complexity
If the cross-lighting duct has fixed opening area, then the structure is simple, but it cannot adapt to different gas amounts and types or burner sizes
Solution Approach 1:
The closing elements provide a simple yet effective mechanism to make the duct adaptable. By adding removable plates with different opening areas, the system can accommodate various gas amounts, types, and burner sizes without complex redesigns.
4Productivity
If secondary air intake is increased to improve flame propagation, then combustion efficiency improves, but the mixture stoichiometry becomes unbalanced
Solution Approach 1:
Secondary air is introduced at specific locations along the cross-lighting duct rather than uniformly throughout. This localized air addition promotes flame propagation in regions where it is most needed while maintaining proper stoichiometry in other sections.
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 uniform mixture diffusion and stable flame propagation by allowing adjustable secondary air intake, improving combustion efficiency and adaptability to various fuel gases and burner configurations.
Implementation Method 1
at least one diffusion chamber placed between said at least two flame spreaders for the diffusion of a primary air/gas mixture
Implementation Method 2
said at least one cross-lighting duct comprises on below at least one lower opening, facing at least in part said upper wall of the cross-lighting duct, which in case can be choked
Implementation Method 3
allowing the inflow of the mixture and air into the cross-lighting duct in stoichiometric conditions such to guarantee a perfect flame propagation inside the duct
Data Source
AI summary
Gas burner having at least two flame spreaders, at least one diffusion chamber between the flame spreaders for the diffusion of a primary air/gas mixture for at least one of the flame spreaders, and at least one cross-lighting duct for the flame passage between the flame spreaders. The duct is disposed transversally inside the diffusion chamber to define a first and a second region in the diffusion chamber and has two side walls and one upper wall, for the fluidic direct connection between the first and the second region of the diffusion chamber. The upper wall has at least one hole for the mixture inflow into the duct and the cross-lighting duct has at least one lower opening facing the upper wall of the cross-lighting duct.