Landfill Flare Vibration Feedback Control for Harmonic Pulsations
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Solution Overview
Problem
Landfill gas-enclosed flares often develop harmonic vibrations or reverberations, which can be felt and heard by residents in the vicinity, causing community disruptions and discomfort.
Innovation Solution
A landfill flare anti-vibration system comprising a first vibration transmitter installed on the flare, a second vibration transmitter installed at a mounting location near the landfill, and a programmable logic controller that monitors vibrations and adjusts the flow of landfill gas to the flare when vibrations exceed a setpoint value, thereby reducing reverberations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excessive flow rates are used to maintain combustion, then the flare can sustain burning, but pulsations occur that combust gas directly off the burner causing vibrations
Solution Approach 1:
The system uses vibration transmitters to continuously monitor flare vibrations and feeds this information back to the PLC controller. When vibrations exceed a threshold, the controller automatically adjusts the blower speed to reduce gas flow, thereby eliminating the harmful vibrations while maintaining safe operation
Solution Approach 2:
The system dynamically changes the operational parameters (blower speed and gas flow rate) based on real-time vibration measurements. By adjusting these parameters, the system transitions from a state causing harmful vibrations to a state that eliminates vibrations while preserving combustion functionality
2Measurement precision
If vibration monitoring is performed at multiple locations, then measurement accuracy improves, but system complexity increases
Solution Approach 1:
The system divides vibration monitoring into multiple independent measurement locations (on the flare stack and at mounting locations within the radius of influence). Each location has its own vibration transmitter, allowing precise localization and characterization of vibration sources without creating a single complex integrated system
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
The system effectively reduces harmonic vibrations from landfill flares, minimizing their impact on nearby communities by automatically adjusting gas flow in response to detected vibrations.
Implementation Method 1
a first vibration transmitter installed on the landfill flare... configured to measure vibrations from the landfill flare
Implementation Method 2
the programmable logic controller is configured to receive signals from the first vibration transmitter and the second vibration transmitter relating to vibrations from the landfill flare
Implementation Method 3
send a command to a control panel for the landfill flare to instruct one or more blowers operatively associated with the landfill flare to lower the flow of landfill gas to the landfill flare
Implementation Method 4
landfill gas-enclosed flares can develop a harmonic vibration or reverberate
Data Source
AI summary
An automated system to monitor, record, and stop landfill harmonic vibrations before they become detectable to the local community is provided. Key components of the system are measured and monitored for vibration intensity and duration. When any of these measurements exceeds critical set point values, the landfill gas blower speed is reduced or the system is shutdown.