Hydrogen Flame Arrestor With Unaligned Substrates
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Solution Overview
Problem
Conventional flame arrestors in internal combustion engines fail to effectively quench backfires caused by the low ignition energy of hydrogen when blended with natural gas, leading to potential engine damage.
Innovation Solution
A hydrogen flame arrestor design featuring a cylindrical housing with two spaced-apart catalyst substrates and an air gap between them, where the channels in each substrate are unaligned, minimizing pressure drop and enhancing backfire quenching capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single substrate flame arrestor is used, then the structure is simple, but it fails to effectively quench backfires caused by hydrogen-natural gas mixtures
Solution Approach 1:
The flame arrestor is divided into two separate substrates positioned at opposite ends of the housing, with an air gap between them. Each substrate independently quenches flames from its respective end, providing redundant protection and enhanced reliability for hydrogen-natural gas mixtures while maintaining a relatively simple overall structure.
2Reliability
If channels in substrates are aligned, then fluid flow resistance is low, but backfire quenching effectiveness is reduced
Solution Approach 1:
The channel orientations in the two substrates are deliberately made different from each other. The first substrate has channels oriented in a first direction, while the second substrate has channels oriented in a second direction that differs from the first. This local variation in channel geometry enhances flame quenching effectiveness by disrupting flame propagation paths while maintaining acceptable pressure drop characteristics.
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 described flame arrestor effectively quenches backfires in hydrogen-natural gas mixtures while maintaining low pressure drop, preventing flames from reaching the intake inlet and ensuring engine safety.
Implementation Method 1
a second substrate within the housing at the second end, the second substrate comprising a plurality of channels from the second end towards the first end; wherein the second substrate is spaced apart from the first substrate, along the longitudinal axis, by an air gap within the housing
Implementation Method 2
Conventional flame arrestors generally use a catalyst substrate, such as disclosed in U.S. Pat. No. 5,375,565
Data Source
AI summary
In an internal combustion engine, the use of natural gas containing hydrocarbon or hydrogen may result in backfires into the intake manifold. Thus, a flame arrestor is disclosed for insertion into intake runners of the intake manifold. The flame arrestor may comprise at least two substrates, separated by an internal air gap of 3-9 millimeters (e.g., substantially 4 millimeters). The substrates may each comprise a metallic mesh with channels. The channel of one substrate may be unaligned with the channels of the other substrate. The internal air gap and/or unaligned channels of the disclosed flame arrestor effectively quench backfires into the intake runners.