Landfill Gas Sensing Using Pressure-Triggered Passive Flow
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Solution Overview
Problem
Existing technologies lack efficient and power-efficient methods for monitoring and measuring landfill gas (LFG) composition and flow, posing risks to human health and the environment due to toxic gas emissions.
Innovation Solution
A differential pressure sensor and controller system that utilizes natural pressure differences to trigger gas entry into the apparatus, combined with gas sensors and solenoid valves, allowing LFG to be measured without fans or pumps, and a wireless communication system for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fans or pumps are used to extract landfill gas for measurement, then gas flow to sensors is ensured, but electrical power consumption increases
Solution Approach 1:
The system uses natural pressure differentials between the landfill and atmosphere to drive gas flow through the sensors, eliminating the need for external power-consuming extraction devices. The pressure-driven flow serves the system's own needs for gas delivery without requiring external energy input.
Solution Approach 2:
The patent replaces mechanical extraction systems (fans and pumps) with a pressure-driven passive flow system. Natural pressure differentials substitute for mechanical force, achieving gas extraction without rotating machinery or electrical motors.
2Measurement precision
If continuous monitoring of LFG composition is performed, then real-time data is obtained, but power consumption increases
Solution Approach 1:
The system performs measurements periodically when pressure differentials are sufficient to drive flow, rather than continuously. The controller activates sensors and data transmission only when natural pressure-driven flow conditions are met, reducing overall power consumption while maintaining useful monitoring capability.
3Use of energy by moving object
If pressure differential triggering is used to control gas entry, then power efficiency is improved, but system complexity increases due to additional valves and sensors
Solution Approach 1:
The differential pressure sensor acts as an intermediary that detects natural pressure conditions and triggers valve activation. This intermediary component enables automatic control based on environmental conditions, achieving power efficiency through intelligent rather than purely mechanical means.
Solution Approach 2:
The system uses feedback from the differential pressure sensor to automatically control valve operation. When pressure differentials reach threshold levels, the controller activates the bottom valve and sensors, creating a closed-loop system that responds to real-time conditions without manual intervention.
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 efficient, power-saving monitoring of LFG composition and flow, reducing electrical power usage and mitigating environmental risks by utilizing natural pressure differentials for gas extraction, while providing real-time data transmission.
Implementation Method 1
a differential pressure sensor configured to measure a pressure difference or a pressure difference change between an atmospheric air pressure and a landfill gas pressure
Implementation Method 2
The second valve (the top valve) and the first valve (the bottom valve) may each include a solenoid valve controlled by the controller
Data Source
AI summary
An apparatus including: a housing configured for installation in a landfill; a differential pressure sensor and at least one gas sensor in the housing; and a first valve configured to control landfill gas (LFG) flow to the at least one gas sensor, wherein the first valve is configured to open when the differential pressure sensor detects a selected pressure difference or pressure difference change between the atmospheric air pressure and the LFG pressure.