Gas Flow Path Filtration for Real-Time Trace Gas Concentration
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Solution Overview
Problem
Existing gas detection systems struggle to detect low-concentration gas species in real-time without occluding the gas, as they rely on concentration methods that require occlusion and release of the gas species.
Innovation Solution
A gas detection system utilizing a gas flow path with a filter, funnel, and coil to concentrate and detect low-concentration gas species in real-time by selectively transmitting the target gas species using a metal organic framework filter and reducing pressure loss through electromagnetic swirling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter is used to occlude and concentrate the detection-target gas species, then the gas concentration can be increased above the detection limit, but real-time detection capability is lost due to the occlusion-release mechanism requirement
Solution Approach 1:
The patent extracts the target gas species from the air stream by selective adsorption on the filter surface, separating it from the bulk gas flow. This allows continuous passage of air while concentrating the target gas on the filter, enabling both detection sensitivity and real-time monitoring without the occlusion-release mechanism
Solution Approach 2:
The filter performs preliminary concentration of the target gas species on its surface during continuous air flow, preparing the gas in a detectable state before it reaches the sensor. This preliminary action occurs continuously rather than in batch cycles, maintaining real-time detection capability
2Measurement precision
If a conventional gas sensor is used, then the detection limit is around ppm level, but it cannot detect low-concentration gas species that have dispersed in atmospheric air
Solution Approach 1:
The patent employs a filter with porous structure that has selective adsorption properties. The porous material concentrates the target gas species on its surface through adsorption, increasing the local concentration to levels detectable by standard sensors, thereby extending the detection capability to dispersed low-concentration gases
Solution Approach 2:
The filter acts as an intermediary between the dispersed low-concentration gas in air and the gas sensor. It pre-concentrates the target gas species on its surface, serving as a mediator that bridges the gap between low ambient concentration and sensor detection requirements
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
Enables real-time concentration and detection of low-concentration gas species without occlusion, allowing for timely monitoring of agricultural product maturity and spoilage, thereby enhancing efficiency in cultivation, distribution, and preservation.
Implementation Method 1
a filter (111) which selectively transmits a gas
Implementation Method 2
a coil (116) which surrounds the funnel (114) from the outside
Data Source
Figure 1
AI summary
A gas flow path includes: a filter (111) configured to selectively transmit a gas; a tubular member (114) provided downstream of the filter and in which an opening area at a downstream end is smaller than an opening area at an upstream end; and a negative pressure generating device (14) provided in a stage subsequent to the tubular member and configured to suck the gas that has passed through the tubular member. This provides a gas flow path and a gas detection system which can concentrate a detection-target gas species in a real-time manner.