Method and system for producing refined biomethane from a renewable natural gas source

A system, comprising:

• a condensate separation vessel configured to receive biogas from a renewable natural gas source and remove at least some condensate from the biogas, the biogas including biomethane;
• a filter assembly coupled to the condensate separation vessel, the filter assembly configured to receive and filter condensate-removed biogas;
• at least one primary compressor coupled to the filter assembly and configured to compress filtered gas received from the filter assembly;
• at least one negative temperature heat exchanger coupled to the at least one primary compressor;
• at least one carbon adsorption vessel coupled to the at least one negative temperature heat exchanger;
• at least one positive temperature change heat exchanger coupled to the at least one carbon adsorption vessel;
• at least one carbon dioxide adsorption vessel assembly coupled to the at least one positive temperature change heat exchanger and configured to remove at least some carbon dioxide from gas received by the at least one carbon dioxide adsorption vessel assembly;
• at least one gas compressor coupled to the at least one carbon dioxide adsorption vessel assembly;
• a first vessel coupled to the at least one gas compressor;
• a first nitrogen rejection vessel assembly coupled to the first vessel, the first nitrogen rejection vessel assembly comprising at least one first nitrogen rejection vessel;
• at least one first compressor coupled to the first nitrogen rejection vessel assembly, wherein the at least one first compressor provides processed biogas;
• a second vessel configured to receive the processed biogas from the at least one first compressor and contain the processed biogas, the processed biogas including biomethane, the processed biogas having been processed from the renewable natural gas source;
• a second nitrogen rejection vessel assembly comprising at least one second nitrogen rejection vessel, the second nitrogen rejection vessel assembly coupled to the second vessel, the at least one second nitrogen rejection vessel configured to:
• receive gas from the second vessel;
• separate at least some nitrogen-containing molecules from the received gas;
• and
• output nitrogen-removed gas;
• at least one second compressor coupled to the second nitrogen rejection vessel assembly, the at least one second compressor configured to:
• receive the nitrogen-removed gas from the second nitrogen rejection vessel assembly;
• and
• compress the nitrogen-removed gas;
• and
• at least one dehydration vessel coupled to the at least one second compressor, the at least one dehydration vessel configured to:
• receive the compressed nitrogen-removed gas from the at least one second compressor;
• remove at least some moisture from the compressed nitrogen-removed gas;
• and
• output refined biomethane gas;
• and
• a control system configured to control at least one of the second vessel, the second nitrogen rejection vessel assembly, one or more of the at least one second nitrogen rejection vessel, one or more of the at least one second compressor, or one or more of the at least one dehydration vessel, the control system comprising at least one controller and a computing device, the computing device including a processor and memory.