DESIGNS FOR ENHANCED RELIABILITY AND CALIBRATION OF LANDFILL GAS MEASUREMENT AND CONTROL DEVICES
First Claim
1. A sensor calibration method performed by an apparatus for sampling landfill gas flowing through a pipe, the apparatus comprising a region configured to receive a section of the pipe having a gas sampling port, at least one sensor, and at least one calibration port, the method comprising:
- isolating the at least one sensor from the gas sampling port;
while the at least one sensor is isolated from the gas sampling port,obtaining at least one sample of a gas having a known composition through the at least one calibration port;
measuring, using the at least one sensor, at least one concentration of at least one constituent gas in the at least one sample of the gas having the known composition; and
automatically calibrating the at least one sensor based on a comparison between the at least one measured concentration of the at least one constituent gas and an expected concentration of the at least one constituent gas in the at least one sample gas having the known composition.
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Accused Products
Abstract
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.
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Citations
21 Claims
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1. A sensor calibration method performed by an apparatus for sampling landfill gas flowing through a pipe, the apparatus comprising a region configured to receive a section of the pipe having a gas sampling port, at least one sensor, and at least one calibration port, the method comprising:
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isolating the at least one sensor from the gas sampling port; while the at least one sensor is isolated from the gas sampling port, obtaining at least one sample of a gas having a known composition through the at least one calibration port; measuring, using the at least one sensor, at least one concentration of at least one constituent gas in the at least one sample of the gas having the known composition; and automatically calibrating the at least one sensor based on a comparison between the at least one measured concentration of the at least one constituent gas and an expected concentration of the at least one constituent gas in the at least one sample gas having the known composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for sampling landfill gas flowing through a pipe, the apparatus comprising:
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an enclosure configured to receive a section of the pipe, the section of the pipe having a gas sampling port; at least one sensor disposed in a region of the enclosure, the at least one sensor being coupled to the section of the pipe through the at least one gas sampling port; a calibration port configured for connection to at least one source of gas of known composition; and a valve connected between the calibration port and the at least one sensor so as to enable gas to flow from the calibration port to the at least one sensor while isolating the at least one sensor from the gas sampling port.
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21. An apparatus for sampling landfill gas flowing through a pipe, the apparatus comprising:
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a sampling subsystem comprising; a gas inlet port and a gas outlet port; a region configured to receive a section of the pipe, the section of the pipe having a gas sampling port; at least one sensor coupled to the gas outlet port; and a gas flow passage from the gas inlet port, over the at least one sensor, and to the gas outlet port, the gas flow passage passing adjacent to and in thermal contact with a thermoelectric condenser; at least one calibration port configured for connection to at least one source of gas of known composition; and at least one valve connected between the at least one calibration port and the sampling subsystem so as to enable gas to flow from the at least one calibration port to the at least one sensor while isolating the at least one sensor from the gas sampling port.
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Specification