Landfill Gas Extraction Throttle for Continuous Flow Control
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Solution Overview
Problem
Conventional landfill gas extraction systems face issues with complete shutdown of gas flow, leading to positive pressure at the gas output, which can result in environmental harm and regulatory violations, and require high energy consumption due to large and heavy flow control mechanisms.
Innovation Solution
A throttle mechanism is integrated into the gas extraction system to control the flow of landfill gas, allowing a variable portion to flow even at maximum closure, powered by low energy sources, and equipped with a motor and gearbox to maintain position without back-drive, ensuring continuous operation and compliance with regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional flow control mechanisms are used to completely shut off gas flow, then gas flow can be stopped, but positive pressure builds up at the gas output causing environmental harm and regulatory violations
Solution Approach 1:
The throttle plate is designed to never completely block the gas flow path, even at maximum closure position. This partial action principle ensures that a minimum flow is always maintained, preventing pressure buildup while still providing effective flow control. The throttle mechanism provides sufficient flow restriction for operational control without achieving complete shutdown that would cause harmful pressure accumulation.
2Manufacturing precision
If large and heavy flow control mechanisms are used to maintain precise throttle position, then control precision is improved, but energy consumption increases
Solution Approach 1:
The system employs a spring-loaded throttle mechanism that uses the natural elastic potential energy of a spring to maintain the throttle plate in its default position and provide restoring force. This self-service approach eliminates the need for continuous electrical power to maintain throttle position, significantly reducing energy consumption while preserving control precision. The spring mechanism automatically compensates for pressure differential forces acting on the throttle plate.
Solution Approach 2:
The control system operates by periodically adjusting the throttle position to desired setpoints rather than continuously actuating the motor. The motor only activates when position correction is needed, and the spring mechanism maintains position between adjustments. This periodic control strategy reduces energy consumption compared to continuous actuation while maintaining precise throttle position control.
3Productivity
If conventional throttle mechanisms are used that can fully close, then flow restriction capability is maximized, but continuous operation is compromised
Solution Approach 1:
The throttle plate is designed with a maximum closure position that intentionally leaves a minimum flow path open, preventing complete flow shutdown. This design ensures continuous gas flow operation while providing sufficient flow restriction capability for all operational requirements. The partial closure approach maintains system reliability by preventing pressure buildup that would occur with complete shutdown.
4Force
If heavy duty motors are used to overcome back-drive forces, then positioning force is sufficient, but energy consumption and device complexity increase
Solution Approach 1:
The spring-loaded mechanism provides self-service by automatically generating the necessary positioning force to overcome back-drive pressure differential forces. The spring force adapts to balance the pressure differential across the throttle plate, eliminating the need for heavy-duty motors and complex feedback control systems. This mechanical self-regulation simplifies the overall device complexity while maintaining sufficient positioning force.
Solution Approach 2:
The spring mechanism acts as a counterweight system, providing a mechanical counterforce to the pressure differential forces acting on the throttle plate. This counterbalancing approach reduces the net force that the motor must generate, allowing the use of smaller, more energy-efficient motors compared to systems that would need to directly overcome full back-drive forces.
Data Source
AI summary
A system for extracting landfill gas from a landfill is provided. According to some embodiments, a control system for landfill gas extraction is provided. The control system uses a throttle to control flow of landfill gas extracted from the landfill. The throttle is actuated in use to vary the flow of gas between a well and a gas collection system, in accordance with a control algorithm that adjusts flow as a parameter in controlling gas extraction. The throttle is configured to ensure that there is at least some flow of landfill gas from the landfill to a gas output throughout operation. The extraction system provides an efficient system for landfill gas extraction, while mitigating a risk of creating undesired or unpleasant conditions and/or of violating regulations during operation.