Buffered Wall Flow Flame Arrester with Z-Type Channels
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Solution Overview
Problem
Traditional flame arresters have limited flame quenching effectiveness due to low collision probability between free radicals and wall surfaces, leading to inadequate suppression of flame propagation and pressure waves, especially in supersonic flames.
Innovation Solution
A buffered wall flow multi-channels flame arrester with a Z-type wall flow multi-channels flame arresting core and a novel buffering and splitting cover that increases the probability of collision between free radicals and channel walls by changing the flame flow direction and using pinholes to redirect the flame, enhancing heat transfer and quenching ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional flame arresting core is used, then device complexity is low, but flame quenching effectiveness is insufficient due to low collision probability between free radicals and wall surfaces
Solution Approach 1:
The flame arresting core is divided into multiple channels (first channel, second channel, third channel, fourth channel) arranged in parallel, each channel independently contributing to flame quenching. This segmentation increases the total wall surface area available for free radical collisions without requiring a single complex structure, thereby improving flame quenching effectiveness while maintaining manageable device complexity
Solution Approach 2:
The patent introduces a Z-type wall flow configuration where channels are arranged in multiple dimensions with alternating flow directions. The first and second channels flow in one direction while the third and fourth channels flow in the opposite direction, creating a three-dimensional wall flow pattern that maximizes the collision probability between free radicals and wall surfaces from multiple angles, significantly enhancing flame quenching effectiveness
2Reliability
If buffer barrier is added to expansion chamber, then flame propagation speed and pressure wave are attenuated, but fuel gas flow resistance is increased
Solution Approach 1:
The buffer barrier is strategically positioned only at the inlet end of the expansion chamber, creating a localized buffering zone where flame propagation speed and pressure waves are attenuated. The barrier consists of uniformly distributed holes that provide selective resistance - sufficient to slow down flame fronts and pressure waves for safety, but with adequate open area to maintain acceptable fuel gas flow resistance under normal operating conditions
Solution Approach 2:
The buffer barrier structure employs asymmetric hole distribution and sizing, with holes of different diameters (first diameter and second diameter) arranged in specific patterns. This asymmetric configuration optimizes the balance between flame suppression capability and flow resistance, creating turbulent flow that enhances flame quenching while minimizing pressure drop across the barrier
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 significantly reduces flame propagation speed and pressure, improving the flame quenching effectiveness and overall safety by increasing the collision probability of free radicals with the channel walls, effectively suppressing deflagration and detonation flames.
Implementation Method 1
the small flames transfer heat to the slit wall surfaces as they contact with the slit wall surfaces that are at a lower temperature, and thereby the temperature of the small flames is decreased quickly
Implementation Method 2
When the flame passes through the slits of the flame arrester, the probability of collision between the free radicals and the wall surfaces increases, the quantity of free radicals involved in the reaction is decreased sharply, and the flame is quenched when the reaction can't continue
Implementation Method 3
the buffering and splitting cover can decrease the propagation speed of the flame and the pressure of the flame front
Implementation Method 4
a Z-type wall flow multi-channels flame arresting core structure that changes the flow direction of the flame and enhances the effect of heat transfer from the flame to the walls
Data Source
AI summary
The present invention belongs to the field of flame arresters, and discloses a buffered wall flow multi-channels flame arrester. The flame arrester comprises a buffering and splitting cover and a Z-type wall flow multi-channels flame arresting core, wherein the buffering and splitting cover has a round-bottom plain-top cylindrical shape or hemispherical shape, with pinholes distributed in the cover surface, and channels are arranged inside the Z-type wall flow multi-channels flame arresting core. In every two adjacent channels, the inlet of one channel is blocked, and the outlet of the other channel is blocked, and in the height direction in the central cross section of the flame arresting core, pinholes are arranged in the wall surfaces between adjacent channels, and adjacent upper and lower channels constitute a fluid channel.