Landfill gas extraction constant flow control method and device

Details Landfill gas extraction constant flow control method and device Landfill gas extraction constant flow control method and device

2006-02-14

2006-02-14

Nghiem, Michael (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

Reexamination Certificate

active

06999883

ABSTRACT:
A control method and apparatus for regulating gas flow from landfill gas wells uses a differential pressure-regulating valve to maintain a set flow through a constant flow wellhead assembly. This wellhead assembly maintains a constant flow from the well despite normal variations in environmental factors affecting gas flow. The wellhead assembly includes a second valve that is used in series with the pressure-regulating valve to adjust the operating conditions of the regulating valve to keep it within its operating range. The pressure-regulating valve configuration allows a simple automatic control to position the valve. Periodic manual sampling of extracted gas and adjustment of the valve conditions is used to adjust for longer-term variations in well conditions.

REFERENCES:
patent: 4026355 (1977-05-01), Johnson et al.
patent: 4890672 (1990-01-01), Hall
patent: 6169962 (2001-01-01), Brookshire et al.

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