Landfill Gas Extraction Control System
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Solution Overview
Problem
Conventional landfill gas extraction techniques are imprecise and inefficient, often resulting in gas with undesired properties and environmental issues such as methane emissions and potential fires, due to imprecise control mechanisms.
Innovation Solution
A control system comprising sensors, flow control mechanisms, and processors that adjust the flow rate of landfill gas based on real-time measurements of gas composition and atmospheric pressure to maintain desired concentrations of methane, oxygen, and energy content, using valves to regulate the flow and optimize gas extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional manual valve control is used in landfill gas extraction wells, then the system is simple to operate, but the gas extraction precision and efficiency deteriorate
Solution Approach 1:
The patent implements automated feedback control by continuously measuring gas composition (methane, oxygen, carbon dioxide concentrations) and using this data to automatically adjust flow control valves. The processor receives sensor data, compares it against target ranges, and modulates valve positions to maintain optimal gas composition, eliminating the need for manual intervention while achieving precise control.
Solution Approach 2:
The patent replaces manual mechanical valve adjustment with an automated electronic control system. Sensors detect gas composition, processors analyze the data and determine valve positioning requirements, and actuators automatically adjust the flow control valves. This substitution of manual mechanical operations with automated sensing and actuation systems resolves the contradiction between operational simplicity and control precision.
2Productivity
If automated control systems with sensors and flow control mechanisms are implemented, then gas extraction precision and efficiency improve, but device complexity increases
Solution Approach 1:
The patent employs a multi-functional control system where a single integrated processor performs multiple tasks: receiving data from multiple sensor types (gas composition, flow rate, pressure), analyzing gas composition to determine valve positioning, controlling multiple flow control valves across different wells, and monitoring system status. This consolidation of multiple functions into a unified control platform achieves high extraction efficiency while managing system complexity through functional integration.
3Quantity of substance
If flow rate is increased to maximize energy content extraction, then productivity improves, but gas composition control precision deteriorates
Solution Approach 1:
The patent implements dynamic control where flow control valve positions are continuously adjusted based on real-time gas composition measurements and extraction rate requirements. The system modulates valve openings to maintain optimal methane concentration (45-55%) and oxygen levels while varying total flow rates to maximize energy content. This dynamic adjustment capability allows the system to simultaneously achieve high productivity and precise composition control by adapting operating parameters continuously rather than maintaining fixed settings.
Data Source
AI summary
A control system for controlling extraction of landfill gas, the system comprising: at least one sensor; at least one flow control mechanism; and at least one processor configured to perform: obtaining a first measure of energy content in a first portion of landfill gas; controlling the at least one flow control mechanism to increase a flow rate of landfill gas; after the controlling, obtaining a second measure of energy content in a second portion of landfill gas; when it is determined that the second measure of energy content is greater than the first measure of energy content, controlling the at least one flow control mechanism to increase the flow rate of landfill gas; and when it is determined that the second measure of energy content is less than the first measure of energy content, controlling the at least one flow control mechanism to decrease the flow rate of landfill gas.