Systems and methods of renewable natural gas processing
Example gas recovery systems include a source gas conditioning assembly configured to condition and compress the inlet source gas to provide a conditioned source gas, a first membrane assembly configured to separate the conditioned source gas into a hydrocarbon enriched stream and a recovery stream, a second membrane assembly fluidly coupled to the hydrocarbon enriched stream, and configured to separate the hydrocarbon enriched stream into a hydrocarbon product stream and a recycle stream, a carbon dioxide (CO 2 ) plant assembly fluidly coupled to the recovery stream configured to provide a carbon dioxide product stream and an enriched recycle stream, a standalone membrane assembly configured to separate the enriched recycle stream into a hydrocarbon enriched recycle stream and an effluent stream, and wherein the source gas conditioning assembly is fluidly coupled to the recycle stream and the hydrocarbon enriched recycle stream.
1. A gas recovery system, comprising:
a source gas conditioning assembly fluidly coupled to an inlet source gas, and configured to condition and compress the inlet source gas to provide a conditioned source gas;
a first membrane assembly fluidly coupled to the conditioned source gas, and configured to separate the conditioned source gas into a hydrocarbon enriched stream and a recovery stream;
a second membrane assembly fluidly coupled to the hydrocarbon enriched stream, and configured to separate the hydrocarbon enriched stream into a hydrocarbon product stream and a recycle stream;
a carbon dioxide (CO 2 ) plant assembly fluidly coupled to the recovery stream, and configured to provide a carbon dioxide product stream and an enriched recycle stream;
a standalone membrane assembly fluidly coupled to the enriched recycle stream, and configured to separate the enriched recycle stream into a hydrocarbon enriched recycle stream and a secondary recovery stream;
wherein the source gas conditioning assembly is fluidly coupled to the recycle stream and the hydrocarbon enriched recycle stream; and
wherein the CO 2 plant assembly is fluidly coupled to the secondary recovery stream.
2. The system of claim 1 , wherein the hydrocarbon enriched recycle stream comprises a retentate of a standalone membrane of the standalone membrane assembly.
3. The system of claim 2 , wherein the source gas conditioning assembly comprises a first fluid coupling to the hydrocarbon enriched recycle stream and a second fluid coupling to the recycle stream, and wherein the first fluid coupling is downstream of the second fluid coupling.
4. The system of claim 3 , wherein the first fluid coupling comprises a higher average pressure position than the second fluid coupling.
5. The system of claim 3 , wherein the first fluid coupling is downstream of a compressor component of the source gas conditioning assembly.