Insulated Landfill Gas Sampling Chambers for Sensor Reliability
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Solution Overview
Problem
Existing landfill gas measurement and control devices face challenges in maintaining reliability and accuracy due to harsh environmental conditions, including high humidity, corrosive gases, particulates, and temperature fluctuations, which can lead to sensor degradation and system inefficiencies.
Innovation Solution
The development of a landfill gas measurement and control device, known as WellWatcher, which includes sensors protected by thermal insulation and filtration systems, integrated fluid knock-outs, and easy-to-install components, allowing for reliable operation in harsh environments and minimizing maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are exposed to landfill gas in harsh environmental conditions, then gas measurement and control functions are performed, but sensor reliability and accuracy deteriorate due to humidity, corrosive gases, particulates, and temperature fluctuations
Solution Approach 1:
The patent introduces an intermediary sampling system between the harsh landfill gas environment and the sensors. The system draws gas samples through a sampling line from the landfill gas stream to a protected sampling chamber where sensors are housed. This intermediary arrangement allows sensors to measure gas composition without direct exposure to harmful environmental factors such as moisture, particulates, and temperature extremes, thereby maintaining sensor reliability and accuracy.
Solution Approach 2:
The patent extracts the sensors from the harsh landfill gas environment and places them in a protected sampling chamber that is physically separated from the main gas stream. By taking the sensors out of direct contact with corrosive gases, high humidity, and temperature fluctuations, the system preserves sensor functionality while still enabling gas composition measurement through sampled gas introduced into the chamber.
2Measurement precision
If thermal insulation is added to protect sensors from temperature fluctuations, then sensor accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the thermal insulation function with the existing sampling chamber structure. The chamber that houses the sensors is designed to provide thermal protection, combining the containment and temperature stabilization functions into a single integrated component. This approach improves sensor accuracy by reducing temperature fluctuations without adding separate, complex insulation systems.
3Reliability
If filtration systems are implemented to remove particulates and corrosive gases, then sensor reliability is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent introduces a filtration system as an intermediary component in the gas sampling path, positioned between the landfill gas stream and the sensors. The filter removes particulates and condensible contaminants from the sampled gas before it reaches the sensors, protecting them from degradation while maintaining a relatively simple overall device structure through strategic placement of the filtration element.
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
Enhances the reliability and efficiency of landfill gas extraction by protecting sensors from environmental hazards, ensuring accurate measurements, and reducing maintenance efforts, thereby improving energy production and minimizing fugitive emissions.
Implementation Method 1
thermal insulation positioned to retain heat from the section of the pipe in the region of the enclosure
Implementation Method 2
a thermoelectric condenser; a gas flow passage from the gas inlet port to the gas outlet port, the gas flow passage passing adjacent to and in thermal contact with the thermoelectric condenser
Data Source
AI summary
An apparatus for sampling landfill gas from a landfill flowing through a pipe. The apparatus may comprise: an enclosure configured to receive a section of the pipe; a gas sampling port in the section of the pipe; at least one sensor device disposed in a region of the enclosure, the at least one sensor being coupled to the section of the pipe through the gas sampling port; and thermal insulation positioned to retain heat from the section of the pipe in the region of the enclosure. A method of operating a landfill gas recovery system. The method may comprise: flowing gas from a well riser pipe through a sampling subsystem to a collection system; and heating a portion of the sampling subsystem with the gas flowing from the well riser pipe to the collection system.