Combustion Plate Flame Stabilization via Lattice Design
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Solution Overview
Problem
Conventional combustion plates in totally aerated burners experience flame lifting issues, especially when the excess air ratio of premixed gases is high, due to interference and recirculation of gases, leading to unstable flames.
Innovation Solution
The combustion plate features a ceramic body with a lattice-shaped non-flame-hole portion and collective flame-hole portions, where additional flame holes are strategically placed along the sides of non-flame-hole portions at increased spacings to enhance interference and stabilize flames, ensuring effective flame holding even at higher excess air ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If flame holes are arranged in pairs on both sides of non-flame-hole portions to enhance flame holding, then flame stability is improved, but flame lifting occurs when excess air ratio is high
Solution Approach 1:
The invention divides the flame hole arrangement into two distinct groups: conventional paired flame holes within collective flame-hole portions and additional single flame holes positioned at specific locations along the non-flame-hole portions. This segmentation allows the additional flame holes to provide stabilizing recirculating flows that prevent flame lifting in the paired flame holes, especially under high excess air ratio conditions.
Solution Approach 2:
The invention applies different flame hole configurations to different locations: paired flame holes are used in collective flame-hole portions for basic flame holding, while additional single flame holes are strategically placed at specific distances (0.5-2.0 times the diameter of the flame holes) along the non-flame-hole portions to create localized recirculating zones that prevent flame lifting in high excess air ratio conditions.
2Productivity
If excess air ratio of premixed gas is increased, then combustion efficiency is improved, but flame lifting occurs in peripheral flame holes
Solution Approach 1:
The additional flame holes are positioned upstream relative to the paired flame holes, creating recirculating flows in advance that establish a protective flow pattern before the paired flame holes operate. This preliminary action ensures that when high excess air ratio causes flame lifting tendency in the paired flame holes, the recirculating flows from the additional flame holes are already in place to stabilize the flames.
3Power
If flame holes are densely arranged in collective flame-hole portions, then heat output is increased, but flame holding becomes unstable
Solution Approach 1:
The additional flame holes positioned along the non-flame-hole portions act as intermediaries that create recirculating flows. These recirculating flows serve as a mediator between the densely arranged flame holes in collective flame-hole portions and the surrounding atmosphere, providing the necessary flow patterns to stabilize the flames while maintaining high heat output from the dense arrangement.
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 configuration effectively prevents flame lifting across the entire plate, maintaining stable flames even with increased excess air ratios, as the additional flame holes improve interference patterns and enhance flame holding effects.
Implementation Method 1
a ceramic plate body has formed therein a multiplicity of flame holes (burner holes) so as to eject a premixed gas
Implementation Method 2
the premixed gases that are ejected through flame holes on the periphery of the collective flame-hole portions adjacent to the non-flame-hole portions partly recirculate in a manner to swirl above the non-flame-hole portions
Implementation Method 3
the premixed gases that recirculate back from the flame holes on the periphery of the collective flame-hole portions that are positioned on both sides of the non-flame-hole portions interfere with each other
Data Source
AI summary
A combustion plate for use in a totally aerated combustion burner has a ceramic plate body with a multiplicity of flame holes formed therein for ejecting a premixed gas. The plate body is provided, in a lattice shape, with non-flame-hole portions having no flame holes therein. Each of such regions of the plate body as are enclosed by the non-flame-hole portions constitutes a collective flame-hole portion having formed therein a plurality of flame holes. It is so arranged that flame lifting can be effectively prevented in the flame holes on the periphery of the collective flame-hole portions. Along each of such sides of the non-flame-hole portions as are adjacent to each of the collective flame-hole portions, outside flame holes are formed at a predetermined spacing therebetween in a longitudinal direction of the non-flame-hole portions. This predetermined spacing is greater than a spacing, in the longitudinal direction of the non-flame-hole portion.