Landfill Gas Extraction Control Using Direct Emission Monitoring
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Solution Overview
Problem
Conventional landfill gas extraction techniques lack precision in reducing greenhouse gas emissions, leading to incomplete mitigation of pollution and odors, as they rely on indirect measurements of gas composition rather than direct monitoring of greenhouse gas emissions.
Innovation Solution
A method and system for controlling landfill gas extraction based on direct measurements of greenhouse gas concentration and mass flow rate, adjusting the extraction flow rate using sensors and controllers to maintain thresholds, thereby enhancing precision in emission reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional landfill gas extraction techniques are used with indirect measurements of gas composition, then the system structure is simpler and operation is easier, but the precision of greenhouse gas emission reduction is insufficient
Solution Approach 1:
The patent implements a feedback control system where sensors continuously monitor greenhouse gas concentrations in extracted landfill gas, and the controller automatically adjusts extraction parameters based on real-time measurements. This closed-loop feedback mechanism enables precise control of emission reduction while maintaining system efficiency, directly resolving the contradiction between measurement precision and device complexity by making the complexity productive through intelligent control.
Solution Approach 2:
The patent replaces conventional mechanical/manual extraction control with an automated electronic control system that uses sensors, controllers, and actuators. This substitution of mechanical systems with electronic and computational systems enables more precise measurement and control of greenhouse gas emissions, improving measurement precision while the automation actually reduces operational complexity despite increasing device complexity.
2Reliability
If manual valve adjustment is used for localized vacuum pressure control, then the system is easier to manufacture and operate, but the emission reduction effectiveness is insufficient
Solution Approach 1:
The patent implements a self-regulating extraction system where the controller automatically adjusts extraction parameters based on real-time sensor feedback without requiring manual intervention. The system monitors greenhouse gas concentrations and autonomously optimizes extraction rates, vacuum pressure, and flow control, making the system self-sufficient and highly reliable while reducing operational burden despite increased automation.
Solution Approach 2:
The closed-loop feedback system continuously monitors emission parameters and automatically adjusts extraction operations to maintain optimal performance. This feedback mechanism ensures reliable emission mitigation by dynamically responding to changing landfill gas composition and flow conditions, eliminating the need for manual operation while significantly improving emission control reliability.
3Reliability
If extraction flow rate is increased to improve emission capture, then greenhouse gas reduction effectiveness improves, but energy consumption and operational complexity increase
Solution Approach 1:
The patent implements dynamic extraction control where the extraction flow rate is continuously adjusted based on real-time monitoring of greenhouse gas concentrations and emission parameters. Rather than operating at constant high extraction rates, the system dynamically optimizes flow rates to match actual emission conditions, maintaining high capture effectiveness while reducing energy consumption during periods of lower emissions through adaptive, real-time parameter adjustment.
Solution Approach 2:
The patent changes operational parameters such as extraction flow rate, vacuum pressure, and valve positions based on real-time emission measurements. By dynamically adjusting these parameters rather than maintaining fixed high values, the system achieves reliable emission capture when needed while reducing energy consumption during normal operating conditions, resolving the contradiction between capture effectiveness and energy use.
Data Source
AI summary
Systems and methods for controlling extraction of landfill gas from a landfill via a gas extraction system comprising a plurality of wells are provided herein. In some embodiments, the method comprises obtaining a concentration of a greenhouse gas measured a distance above a surface of a region comprising the plurality of wells; determining whether the measure of the concentration of the greenhouse gas is greater than a first threshold; and in response to determining that the measure of the concentration of the greenhouse gas is greater than the first threshold, increasing a flow rate of landfill gas being extracted from at least one well of the plurality of wells.