Gas processing systems with emissions quantification

A system, comprising:

• an engine configured to ingest fuel via one or more intake lines;
• a compressor coupled with the engine, wherein the engine is configured to drive the compressor;
• one or more emissions lines configured to direct leakage emissions from the compressor to the engine to be ingested as an alternate fuel source;
• one or more oxygen sensors configured to generate oxygen sensor data indicating oxygen levels in an exhaust stream of the engine;
• at least one processor communicably coupled to the one or more oxygen sensors;
• and
• memory communicably coupled to the at least one processor, the memory storing instructions, which, when executed, cause the at least one processor to perform operations comprising:
• determining, based at least in part on the oxygen sensor data, an actual air-fuel ratio of an exhaust stream of the engine;
• determining, based at least in part on a comparison of the actual air-fuel ratio to a commanded stoichiometric air-fuel ratio, an error correction corresponding to an adjustment in the air-fuel mixture supplied to the engine to compensate for a difference between the actual air-fuel ratio and the commanded stoichiometric air-fuel ratio;
• and
• quantifying, based at least in part on a comparison of the error correction to a baseline error correction, the leakage emissions from the compressor, wherein the baseline error correction corresponds to an expected adjustment in the air-fuel mixture supplied to the engine when the engine is not ingesting leakage emissions from the compressor.

A system, comprising:

• an engine configured to ingest fuel via one or more intake lines;
• a primary fuel source coupled with the engine via the one or more intake lines;
• a secondary fuel source coupled with the engine via the one or more intake lines;
• one or more oxygen sensors configured to generate oxygen data indicating oxygen levels in gas exhausted from the engine via one or more exhaust lines;
• one or more processors configured to:
• determine a first error correction for gas exhausted from the engine based on fuel ingestion from the primary fuel source and not from the secondary fuel source, the baseline error correction being determined based at least in part on a comparison between a first actual air-fuel ratio and a first stoichiometric air-fuel ratio, the first actual air-fuel ratio being determined based at least in part on the oxygen data from the one or more oxygen sensors;
• determine, based at least in part on the oxygen data, a second actual air-fuel ratio;
• determine, based at least in part on a comparison between the second actual air-fuel ratio and a second stoichiometric air-fuel ratio, a second error correction different from the first error correction;
• quantify, based at least in part on a variance of the second error correction from the first error correction, at least one of:
• an amount of fuel from the secondary fuel source that was ingested by the engine;
• or
• an amount of gas emissions from the engine that is attributable to the secondary fuel source.