Devices and techniques relating to landfill gas extraction
First Claim
1. A system for controlling extraction of landfill gas from a landfill via a gas extraction system, the gas extraction system comprising at least one vacuum source, well piping, and at least one well coupled to the at least one vacuum source through the well piping, the system comprising:
- at least one sensor configured to measure characteristics of extracted landfill gas being extracted from the landfill, the characteristics of the extracted landfill gas including a concentration of one or more constituent gasses in the extracted landfill gas;
at least one flow control mechanism disposed in well piping and configured to control flow rate of landfill gas through the gas extraction system; and
a controller configured to;
determine a measure of concentration of nitrogen in the landfill gas being extracted from the landfill at least in part by using the at least one sensor; and
automatically control the at least one flow control mechanism based at least on the measured concentration of nitrogen in the landfill gas being extracted from the landfill at least in part by;
determining whether the measure of concentration of nitrogen is different from a target constant nitrogen concentration; and
automatically controlling the at least one flow control mechanism to change concentration of nitrogen in landfill gas being extracted from the landfill when it is determined that the measure of concentration of nitrogen is different from the target constant nitrogen concentration.
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Accused Products
Abstract
Devices and techniques related to landfill gas extraction are disclosed. A technique for controlling extraction of landfill gas from a landfill through a gas extraction system is described. The method may include measuring a plurality of values indicating conditions associated with the landfill; computing, based at least in part on the plurality of values and on a model of the landfill, a predicted future state of the landfill; determining, based at least in part on the predicted future state of the landfill, one or more control parameters for one or more respective control devices configured to control operation of the gas extraction system; applying the one or more control parameters to the one or more respective control, and with the one or more control devices, controlling extraction of the landfill gas from the landfill based, at least in part, on the one or more respective control parameters.
76 Citations
19 Claims
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1. A system for controlling extraction of landfill gas from a landfill via a gas extraction system, the gas extraction system comprising at least one vacuum source, well piping, and at least one well coupled to the at least one vacuum source through the well piping, the system comprising:
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at least one sensor configured to measure characteristics of extracted landfill gas being extracted from the landfill, the characteristics of the extracted landfill gas including a concentration of one or more constituent gasses in the extracted landfill gas; at least one flow control mechanism disposed in well piping and configured to control flow rate of landfill gas through the gas extraction system; and a controller configured to; determine a measure of concentration of nitrogen in the landfill gas being extracted from the landfill at least in part by using the at least one sensor; and automatically control the at least one flow control mechanism based at least on the measured concentration of nitrogen in the landfill gas being extracted from the landfill at least in part by; determining whether the measure of concentration of nitrogen is different from a target constant nitrogen concentration; and automatically controlling the at least one flow control mechanism to change concentration of nitrogen in landfill gas being extracted from the landfill when it is determined that the measure of concentration of nitrogen is different from the target constant nitrogen concentration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for controlling extraction of landfill gas from a landfill through a gas extraction system, the gas extraction system comprising at least one flow control mechanism, the method comprising:
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obtaining, using at least one sensor, measurements of characteristics of extracted landfill gas being extracted from the landfill, the characteristics of the extracted landfill gas including a concentration of one or more constituent gases in the extracted landfill gas; determining a measure of concentration of nitrogen in the landfill gas being extracted from the landfill at least in part by using the at least one sensor; and automatically controlling the at least one flow control mechanism based at least on the measured concentration of nitrogen in the landfill gas being extracted from the landfill at least in part by; determining whether the measure of concentration of nitrogen is different from a target constant nitrogen concentration; and automatically controlling the at least one flow control mechanism to change concentration of nitrogen in landfill gas being extracted from the landfill when it is determined that the measure of concentration of nitrogen is different from the target constant nitrogen concentration. - View Dependent Claims (16, 17, 18, 19)
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Specification